xref: /openbmc/linux/lib/vsprintf.c (revision c8e000604bce02a87742240a9b716a0f1b680c0b)
11da177e4SLinus Torvalds /*
21da177e4SLinus Torvalds  *  linux/lib/vsprintf.c
31da177e4SLinus Torvalds  *
41da177e4SLinus Torvalds  *  Copyright (C) 1991, 1992  Linus Torvalds
51da177e4SLinus Torvalds  */
61da177e4SLinus Torvalds 
71da177e4SLinus Torvalds /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
81da177e4SLinus Torvalds /*
91da177e4SLinus Torvalds  * Wirzenius wrote this portably, Torvalds fucked it up :-)
101da177e4SLinus Torvalds  */
111da177e4SLinus Torvalds 
121da177e4SLinus Torvalds /*
131da177e4SLinus Torvalds  * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com>
141da177e4SLinus Torvalds  * - changed to provide snprintf and vsnprintf functions
151da177e4SLinus Torvalds  * So Feb  1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de>
161da177e4SLinus Torvalds  * - scnprintf and vscnprintf
171da177e4SLinus Torvalds  */
181da177e4SLinus Torvalds 
191da177e4SLinus Torvalds #include <stdarg.h>
201da177e4SLinus Torvalds #include <linux/module.h>
211da177e4SLinus Torvalds #include <linux/types.h>
221da177e4SLinus Torvalds #include <linux/string.h>
231da177e4SLinus Torvalds #include <linux/ctype.h>
241da177e4SLinus Torvalds #include <linux/kernel.h>
250fe1ef24SLinus Torvalds #include <linux/kallsyms.h>
260fe1ef24SLinus Torvalds #include <linux/uaccess.h>
27332d2e78SLinus Torvalds #include <linux/ioport.h>
288a27f7c9SJoe Perches #include <net/addrconf.h>
291da177e4SLinus Torvalds 
304e57b681STim Schmielau #include <asm/page.h>		/* for PAGE_SIZE */
311da177e4SLinus Torvalds #include <asm/div64.h>
32deac93dfSJames Bottomley #include <asm/sections.h>	/* for dereference_function_descriptor() */
331da177e4SLinus Torvalds 
349b706aeeSDenys Vlasenko /* Works only for digits and letters, but small and fast */
359b706aeeSDenys Vlasenko #define TOLOWER(x) ((x) | 0x20)
369b706aeeSDenys Vlasenko 
37aa46a63eSHarvey Harrison static unsigned int simple_guess_base(const char *cp)
38aa46a63eSHarvey Harrison {
39aa46a63eSHarvey Harrison 	if (cp[0] == '0') {
40aa46a63eSHarvey Harrison 		if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2]))
41aa46a63eSHarvey Harrison 			return 16;
42aa46a63eSHarvey Harrison 		else
43aa46a63eSHarvey Harrison 			return 8;
44aa46a63eSHarvey Harrison 	} else {
45aa46a63eSHarvey Harrison 		return 10;
46aa46a63eSHarvey Harrison 	}
47aa46a63eSHarvey Harrison }
48aa46a63eSHarvey Harrison 
491da177e4SLinus Torvalds /**
501da177e4SLinus Torvalds  * simple_strtoull - convert a string to an unsigned long long
511da177e4SLinus Torvalds  * @cp: The start of the string
521da177e4SLinus Torvalds  * @endp: A pointer to the end of the parsed string will be placed here
531da177e4SLinus Torvalds  * @base: The number base to use
541da177e4SLinus Torvalds  */
551da177e4SLinus Torvalds unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
561da177e4SLinus Torvalds {
57aa46a63eSHarvey Harrison 	unsigned long long result = 0;
581da177e4SLinus Torvalds 
59aa46a63eSHarvey Harrison 	if (!base)
60aa46a63eSHarvey Harrison 		base = simple_guess_base(cp);
61aa46a63eSHarvey Harrison 
62aa46a63eSHarvey Harrison 	if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x')
631da177e4SLinus Torvalds 		cp += 2;
64aa46a63eSHarvey Harrison 
65aa46a63eSHarvey Harrison 	while (isxdigit(*cp)) {
66aa46a63eSHarvey Harrison 		unsigned int value;
67aa46a63eSHarvey Harrison 
68aa46a63eSHarvey Harrison 		value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10;
69aa46a63eSHarvey Harrison 		if (value >= base)
70aa46a63eSHarvey Harrison 			break;
711da177e4SLinus Torvalds 		result = result * base + value;
721da177e4SLinus Torvalds 		cp++;
731da177e4SLinus Torvalds 	}
741da177e4SLinus Torvalds 	if (endp)
751da177e4SLinus Torvalds 		*endp = (char *)cp;
767b9186f5SAndré Goddard Rosa 
771da177e4SLinus Torvalds 	return result;
781da177e4SLinus Torvalds }
791da177e4SLinus Torvalds EXPORT_SYMBOL(simple_strtoull);
801da177e4SLinus Torvalds 
811da177e4SLinus Torvalds /**
82922ac25cSAndré Goddard Rosa  * simple_strtoul - convert a string to an unsigned long
83922ac25cSAndré Goddard Rosa  * @cp: The start of the string
84922ac25cSAndré Goddard Rosa  * @endp: A pointer to the end of the parsed string will be placed here
85922ac25cSAndré Goddard Rosa  * @base: The number base to use
86922ac25cSAndré Goddard Rosa  */
87922ac25cSAndré Goddard Rosa unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
88922ac25cSAndré Goddard Rosa {
89922ac25cSAndré Goddard Rosa 	return simple_strtoull(cp, endp, base);
90922ac25cSAndré Goddard Rosa }
91922ac25cSAndré Goddard Rosa EXPORT_SYMBOL(simple_strtoul);
92922ac25cSAndré Goddard Rosa 
93922ac25cSAndré Goddard Rosa /**
94922ac25cSAndré Goddard Rosa  * simple_strtol - convert a string to a signed long
95922ac25cSAndré Goddard Rosa  * @cp: The start of the string
96922ac25cSAndré Goddard Rosa  * @endp: A pointer to the end of the parsed string will be placed here
97922ac25cSAndré Goddard Rosa  * @base: The number base to use
98922ac25cSAndré Goddard Rosa  */
99922ac25cSAndré Goddard Rosa long simple_strtol(const char *cp, char **endp, unsigned int base)
100922ac25cSAndré Goddard Rosa {
101922ac25cSAndré Goddard Rosa 	if (*cp == '-')
102922ac25cSAndré Goddard Rosa 		return -simple_strtoul(cp + 1, endp, base);
103922ac25cSAndré Goddard Rosa 
104922ac25cSAndré Goddard Rosa 	return simple_strtoul(cp, endp, base);
105922ac25cSAndré Goddard Rosa }
106922ac25cSAndré Goddard Rosa EXPORT_SYMBOL(simple_strtol);
107922ac25cSAndré Goddard Rosa 
108922ac25cSAndré Goddard Rosa /**
1091da177e4SLinus Torvalds  * simple_strtoll - convert a string to a signed long long
1101da177e4SLinus Torvalds  * @cp: The start of the string
1111da177e4SLinus Torvalds  * @endp: A pointer to the end of the parsed string will be placed here
1121da177e4SLinus Torvalds  * @base: The number base to use
1131da177e4SLinus Torvalds  */
1141da177e4SLinus Torvalds long long simple_strtoll(const char *cp, char **endp, unsigned int base)
1151da177e4SLinus Torvalds {
1161da177e4SLinus Torvalds 	if (*cp == '-')
1171da177e4SLinus Torvalds 		return -simple_strtoull(cp + 1, endp, base);
1187b9186f5SAndré Goddard Rosa 
1191da177e4SLinus Torvalds 	return simple_strtoull(cp, endp, base);
1201da177e4SLinus Torvalds }
1211da177e4SLinus Torvalds 
12206b2a76dSYi Yang /**
12306b2a76dSYi Yang  * strict_strtoul - convert a string to an unsigned long strictly
12406b2a76dSYi Yang  * @cp: The string to be converted
12506b2a76dSYi Yang  * @base: The number base to use
12606b2a76dSYi Yang  * @res: The converted result value
12706b2a76dSYi Yang  *
12806b2a76dSYi Yang  * strict_strtoul converts a string to an unsigned long only if the
12906b2a76dSYi Yang  * string is really an unsigned long string, any string containing
13006b2a76dSYi Yang  * any invalid char at the tail will be rejected and -EINVAL is returned,
13106b2a76dSYi Yang  * only a newline char at the tail is acceptible because people generally
13206b2a76dSYi Yang  * change a module parameter in the following way:
13306b2a76dSYi Yang  *
13406b2a76dSYi Yang  * 	echo 1024 > /sys/module/e1000/parameters/copybreak
13506b2a76dSYi Yang  *
13606b2a76dSYi Yang  * echo will append a newline to the tail.
13706b2a76dSYi Yang  *
13806b2a76dSYi Yang  * It returns 0 if conversion is successful and *res is set to the converted
13906b2a76dSYi Yang  * value, otherwise it returns -EINVAL and *res is set to 0.
14006b2a76dSYi Yang  *
14106b2a76dSYi Yang  * simple_strtoul just ignores the successive invalid characters and
14206b2a76dSYi Yang  * return the converted value of prefix part of the string.
14306b2a76dSYi Yang  */
1449d85db22SHarvey Harrison int strict_strtoul(const char *cp, unsigned int base, unsigned long *res)
1459d85db22SHarvey Harrison {
1469d85db22SHarvey Harrison 	char *tail;
1479d85db22SHarvey Harrison 	unsigned long val;
1489d85db22SHarvey Harrison 	size_t len;
1499d85db22SHarvey Harrison 
1509d85db22SHarvey Harrison 	*res = 0;
1519d85db22SHarvey Harrison 	len = strlen(cp);
1529d85db22SHarvey Harrison 	if (len == 0)
1539d85db22SHarvey Harrison 		return -EINVAL;
1549d85db22SHarvey Harrison 
1559d85db22SHarvey Harrison 	val = simple_strtoul(cp, &tail, base);
156e899aa82SPavel Machek 	if (tail == cp)
157e899aa82SPavel Machek 		return -EINVAL;
1587b9186f5SAndré Goddard Rosa 
1599d85db22SHarvey Harrison 	if ((*tail == '\0') ||
1609d85db22SHarvey Harrison 		((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
1619d85db22SHarvey Harrison 		*res = val;
1629d85db22SHarvey Harrison 		return 0;
1639d85db22SHarvey Harrison 	}
1649d85db22SHarvey Harrison 
1659d85db22SHarvey Harrison 	return -EINVAL;
1669d85db22SHarvey Harrison }
1679d85db22SHarvey Harrison EXPORT_SYMBOL(strict_strtoul);
16806b2a76dSYi Yang 
16906b2a76dSYi Yang /**
17006b2a76dSYi Yang  * strict_strtol - convert a string to a long strictly
17106b2a76dSYi Yang  * @cp: The string to be converted
17206b2a76dSYi Yang  * @base: The number base to use
17306b2a76dSYi Yang  * @res: The converted result value
17406b2a76dSYi Yang  *
17506b2a76dSYi Yang  * strict_strtol is similiar to strict_strtoul, but it allows the first
17606b2a76dSYi Yang  * character of a string is '-'.
17706b2a76dSYi Yang  *
17806b2a76dSYi Yang  * It returns 0 if conversion is successful and *res is set to the converted
17906b2a76dSYi Yang  * value, otherwise it returns -EINVAL and *res is set to 0.
18006b2a76dSYi Yang  */
1819d85db22SHarvey Harrison int strict_strtol(const char *cp, unsigned int base, long *res)
1829d85db22SHarvey Harrison {
1839d85db22SHarvey Harrison 	int ret;
1849d85db22SHarvey Harrison 	if (*cp == '-') {
1859d85db22SHarvey Harrison 		ret = strict_strtoul(cp + 1, base, (unsigned long *)res);
1869d85db22SHarvey Harrison 		if (!ret)
1879d85db22SHarvey Harrison 			*res = -(*res);
1889d85db22SHarvey Harrison 	} else {
1899d85db22SHarvey Harrison 		ret = strict_strtoul(cp, base, (unsigned long *)res);
1909d85db22SHarvey Harrison 	}
1919d85db22SHarvey Harrison 
1929d85db22SHarvey Harrison 	return ret;
1939d85db22SHarvey Harrison }
1949d85db22SHarvey Harrison EXPORT_SYMBOL(strict_strtol);
19506b2a76dSYi Yang 
19606b2a76dSYi Yang /**
19706b2a76dSYi Yang  * strict_strtoull - convert a string to an unsigned long long strictly
19806b2a76dSYi Yang  * @cp: The string to be converted
19906b2a76dSYi Yang  * @base: The number base to use
20006b2a76dSYi Yang  * @res: The converted result value
20106b2a76dSYi Yang  *
20206b2a76dSYi Yang  * strict_strtoull converts a string to an unsigned long long only if the
20306b2a76dSYi Yang  * string is really an unsigned long long string, any string containing
20406b2a76dSYi Yang  * any invalid char at the tail will be rejected and -EINVAL is returned,
20506b2a76dSYi Yang  * only a newline char at the tail is acceptible because people generally
20606b2a76dSYi Yang  * change a module parameter in the following way:
20706b2a76dSYi Yang  *
20806b2a76dSYi Yang  * 	echo 1024 > /sys/module/e1000/parameters/copybreak
20906b2a76dSYi Yang  *
21006b2a76dSYi Yang  * echo will append a newline to the tail of the string.
21106b2a76dSYi Yang  *
21206b2a76dSYi Yang  * It returns 0 if conversion is successful and *res is set to the converted
21306b2a76dSYi Yang  * value, otherwise it returns -EINVAL and *res is set to 0.
21406b2a76dSYi Yang  *
21506b2a76dSYi Yang  * simple_strtoull just ignores the successive invalid characters and
21606b2a76dSYi Yang  * return the converted value of prefix part of the string.
21706b2a76dSYi Yang  */
2189d85db22SHarvey Harrison int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res)
2199d85db22SHarvey Harrison {
2209d85db22SHarvey Harrison 	char *tail;
2219d85db22SHarvey Harrison 	unsigned long long val;
2229d85db22SHarvey Harrison 	size_t len;
2239d85db22SHarvey Harrison 
2249d85db22SHarvey Harrison 	*res = 0;
2259d85db22SHarvey Harrison 	len = strlen(cp);
2269d85db22SHarvey Harrison 	if (len == 0)
2279d85db22SHarvey Harrison 		return -EINVAL;
2289d85db22SHarvey Harrison 
2299d85db22SHarvey Harrison 	val = simple_strtoull(cp, &tail, base);
230e899aa82SPavel Machek 	if (tail == cp)
231e899aa82SPavel Machek 		return -EINVAL;
2329d85db22SHarvey Harrison 	if ((*tail == '\0') ||
2339d85db22SHarvey Harrison 		((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
2349d85db22SHarvey Harrison 		*res = val;
2359d85db22SHarvey Harrison 		return 0;
2369d85db22SHarvey Harrison 	}
2379d85db22SHarvey Harrison 
2389d85db22SHarvey Harrison 	return -EINVAL;
2399d85db22SHarvey Harrison }
2409d85db22SHarvey Harrison EXPORT_SYMBOL(strict_strtoull);
24106b2a76dSYi Yang 
24206b2a76dSYi Yang /**
24306b2a76dSYi Yang  * strict_strtoll - convert a string to a long long strictly
24406b2a76dSYi Yang  * @cp: The string to be converted
24506b2a76dSYi Yang  * @base: The number base to use
24606b2a76dSYi Yang  * @res: The converted result value
24706b2a76dSYi Yang  *
24806b2a76dSYi Yang  * strict_strtoll is similiar to strict_strtoull, but it allows the first
24906b2a76dSYi Yang  * character of a string is '-'.
25006b2a76dSYi Yang  *
25106b2a76dSYi Yang  * It returns 0 if conversion is successful and *res is set to the converted
25206b2a76dSYi Yang  * value, otherwise it returns -EINVAL and *res is set to 0.
25306b2a76dSYi Yang  */
2549d85db22SHarvey Harrison int strict_strtoll(const char *cp, unsigned int base, long long *res)
2559d85db22SHarvey Harrison {
2569d85db22SHarvey Harrison 	int ret;
2579d85db22SHarvey Harrison 	if (*cp == '-') {
2589d85db22SHarvey Harrison 		ret = strict_strtoull(cp + 1, base, (unsigned long long *)res);
2599d85db22SHarvey Harrison 		if (!ret)
2609d85db22SHarvey Harrison 			*res = -(*res);
2619d85db22SHarvey Harrison 	} else {
2629d85db22SHarvey Harrison 		ret = strict_strtoull(cp, base, (unsigned long long *)res);
2639d85db22SHarvey Harrison 	}
26406b2a76dSYi Yang 
2659d85db22SHarvey Harrison 	return ret;
2669d85db22SHarvey Harrison }
26706b2a76dSYi Yang EXPORT_SYMBOL(strict_strtoll);
26806b2a76dSYi Yang 
2691da177e4SLinus Torvalds static int skip_atoi(const char **s)
2701da177e4SLinus Torvalds {
2711da177e4SLinus Torvalds 	int i = 0;
2721da177e4SLinus Torvalds 
2731da177e4SLinus Torvalds 	while (isdigit(**s))
2741da177e4SLinus Torvalds 		i = i*10 + *((*s)++) - '0';
2757b9186f5SAndré Goddard Rosa 
2761da177e4SLinus Torvalds 	return i;
2771da177e4SLinus Torvalds }
2781da177e4SLinus Torvalds 
2794277eeddSDenis Vlasenko /* Decimal conversion is by far the most typical, and is used
2804277eeddSDenis Vlasenko  * for /proc and /sys data. This directly impacts e.g. top performance
2814277eeddSDenis Vlasenko  * with many processes running. We optimize it for speed
2824277eeddSDenis Vlasenko  * using code from
2834277eeddSDenis Vlasenko  * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
2844277eeddSDenis Vlasenko  * (with permission from the author, Douglas W. Jones). */
2854277eeddSDenis Vlasenko 
2864277eeddSDenis Vlasenko /* Formats correctly any integer in [0,99999].
2874277eeddSDenis Vlasenko  * Outputs from one to five digits depending on input.
2884277eeddSDenis Vlasenko  * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
2894277eeddSDenis Vlasenko static char *put_dec_trunc(char *buf, unsigned q)
2904277eeddSDenis Vlasenko {
2914277eeddSDenis Vlasenko 	unsigned d3, d2, d1, d0;
2924277eeddSDenis Vlasenko 	d1 = (q>>4) & 0xf;
2934277eeddSDenis Vlasenko 	d2 = (q>>8) & 0xf;
2944277eeddSDenis Vlasenko 	d3 = (q>>12);
2954277eeddSDenis Vlasenko 
2964277eeddSDenis Vlasenko 	d0 = 6*(d3 + d2 + d1) + (q & 0xf);
2974277eeddSDenis Vlasenko 	q = (d0 * 0xcd) >> 11;
2984277eeddSDenis Vlasenko 	d0 = d0 - 10*q;
2994277eeddSDenis Vlasenko 	*buf++ = d0 + '0'; /* least significant digit */
3004277eeddSDenis Vlasenko 	d1 = q + 9*d3 + 5*d2 + d1;
3014277eeddSDenis Vlasenko 	if (d1 != 0) {
3024277eeddSDenis Vlasenko 		q = (d1 * 0xcd) >> 11;
3034277eeddSDenis Vlasenko 		d1 = d1 - 10*q;
3044277eeddSDenis Vlasenko 		*buf++ = d1 + '0'; /* next digit */
3054277eeddSDenis Vlasenko 
3064277eeddSDenis Vlasenko 		d2 = q + 2*d2;
3074277eeddSDenis Vlasenko 		if ((d2 != 0) || (d3 != 0)) {
3084277eeddSDenis Vlasenko 			q = (d2 * 0xd) >> 7;
3094277eeddSDenis Vlasenko 			d2 = d2 - 10*q;
3104277eeddSDenis Vlasenko 			*buf++ = d2 + '0'; /* next digit */
3114277eeddSDenis Vlasenko 
3124277eeddSDenis Vlasenko 			d3 = q + 4*d3;
3134277eeddSDenis Vlasenko 			if (d3 != 0) {
3144277eeddSDenis Vlasenko 				q = (d3 * 0xcd) >> 11;
3154277eeddSDenis Vlasenko 				d3 = d3 - 10*q;
3164277eeddSDenis Vlasenko 				*buf++ = d3 + '0';  /* next digit */
3174277eeddSDenis Vlasenko 				if (q != 0)
3184277eeddSDenis Vlasenko 					*buf++ = q + '0'; /* most sign. digit */
3194277eeddSDenis Vlasenko 			}
3204277eeddSDenis Vlasenko 		}
3214277eeddSDenis Vlasenko 	}
3227b9186f5SAndré Goddard Rosa 
3234277eeddSDenis Vlasenko 	return buf;
3244277eeddSDenis Vlasenko }
3254277eeddSDenis Vlasenko /* Same with if's removed. Always emits five digits */
3264277eeddSDenis Vlasenko static char *put_dec_full(char *buf, unsigned q)
3274277eeddSDenis Vlasenko {
3284277eeddSDenis Vlasenko 	/* BTW, if q is in [0,9999], 8-bit ints will be enough, */
3294277eeddSDenis Vlasenko 	/* but anyway, gcc produces better code with full-sized ints */
3304277eeddSDenis Vlasenko 	unsigned d3, d2, d1, d0;
3314277eeddSDenis Vlasenko 	d1 = (q>>4) & 0xf;
3324277eeddSDenis Vlasenko 	d2 = (q>>8) & 0xf;
3334277eeddSDenis Vlasenko 	d3 = (q>>12);
3344277eeddSDenis Vlasenko 
3357b9186f5SAndré Goddard Rosa 	/*
3367b9186f5SAndré Goddard Rosa 	 * Possible ways to approx. divide by 10
3377b9186f5SAndré Goddard Rosa 	 * gcc -O2 replaces multiply with shifts and adds
3387b9186f5SAndré Goddard Rosa 	 * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
3397b9186f5SAndré Goddard Rosa 	 * (x * 0x67) >> 10:  1100111
3407b9186f5SAndré Goddard Rosa 	 * (x * 0x34) >> 9:    110100 - same
3417b9186f5SAndré Goddard Rosa 	 * (x * 0x1a) >> 8:     11010 - same
3427b9186f5SAndré Goddard Rosa 	 * (x * 0x0d) >> 7:      1101 - same, shortest code (on i386)
3437b9186f5SAndré Goddard Rosa 	 */
3444277eeddSDenis Vlasenko 	d0 = 6*(d3 + d2 + d1) + (q & 0xf);
3454277eeddSDenis Vlasenko 	q = (d0 * 0xcd) >> 11;
3464277eeddSDenis Vlasenko 	d0 = d0 - 10*q;
3474277eeddSDenis Vlasenko 	*buf++ = d0 + '0';
3484277eeddSDenis Vlasenko 	d1 = q + 9*d3 + 5*d2 + d1;
3494277eeddSDenis Vlasenko 		q = (d1 * 0xcd) >> 11;
3504277eeddSDenis Vlasenko 		d1 = d1 - 10*q;
3514277eeddSDenis Vlasenko 		*buf++ = d1 + '0';
3524277eeddSDenis Vlasenko 
3534277eeddSDenis Vlasenko 		d2 = q + 2*d2;
3544277eeddSDenis Vlasenko 			q = (d2 * 0xd) >> 7;
3554277eeddSDenis Vlasenko 			d2 = d2 - 10*q;
3564277eeddSDenis Vlasenko 			*buf++ = d2 + '0';
3574277eeddSDenis Vlasenko 
3584277eeddSDenis Vlasenko 			d3 = q + 4*d3;
3594277eeddSDenis Vlasenko 				q = (d3 * 0xcd) >> 11; /* - shorter code */
3604277eeddSDenis Vlasenko 				/* q = (d3 * 0x67) >> 10; - would also work */
3614277eeddSDenis Vlasenko 				d3 = d3 - 10*q;
3624277eeddSDenis Vlasenko 				*buf++ = d3 + '0';
3634277eeddSDenis Vlasenko 					*buf++ = q + '0';
3647b9186f5SAndré Goddard Rosa 
3654277eeddSDenis Vlasenko 	return buf;
3664277eeddSDenis Vlasenko }
3674277eeddSDenis Vlasenko /* No inlining helps gcc to use registers better */
3684277eeddSDenis Vlasenko static noinline char *put_dec(char *buf, unsigned long long num)
3694277eeddSDenis Vlasenko {
3704277eeddSDenis Vlasenko 	while (1) {
3714277eeddSDenis Vlasenko 		unsigned rem;
3724277eeddSDenis Vlasenko 		if (num < 100000)
3734277eeddSDenis Vlasenko 			return put_dec_trunc(buf, num);
3744277eeddSDenis Vlasenko 		rem = do_div(num, 100000);
3754277eeddSDenis Vlasenko 		buf = put_dec_full(buf, rem);
3764277eeddSDenis Vlasenko 	}
3774277eeddSDenis Vlasenko }
3784277eeddSDenis Vlasenko 
3791da177e4SLinus Torvalds #define ZEROPAD	1		/* pad with zero */
3801da177e4SLinus Torvalds #define SIGN	2		/* unsigned/signed long */
3811da177e4SLinus Torvalds #define PLUS	4		/* show plus */
3821da177e4SLinus Torvalds #define SPACE	8		/* space if plus */
3831da177e4SLinus Torvalds #define LEFT	16		/* left justified */
3849b706aeeSDenys Vlasenko #define SMALL	32		/* Must be 32 == 0x20 */
3859b706aeeSDenys Vlasenko #define SPECIAL	64		/* 0x */
3861da177e4SLinus Torvalds 
387fef20d9cSFrederic Weisbecker enum format_type {
388fef20d9cSFrederic Weisbecker 	FORMAT_TYPE_NONE, /* Just a string part */
389ed681a91SVegard Nossum 	FORMAT_TYPE_WIDTH,
390fef20d9cSFrederic Weisbecker 	FORMAT_TYPE_PRECISION,
391fef20d9cSFrederic Weisbecker 	FORMAT_TYPE_CHAR,
392fef20d9cSFrederic Weisbecker 	FORMAT_TYPE_STR,
393fef20d9cSFrederic Weisbecker 	FORMAT_TYPE_PTR,
394fef20d9cSFrederic Weisbecker 	FORMAT_TYPE_PERCENT_CHAR,
395fef20d9cSFrederic Weisbecker 	FORMAT_TYPE_INVALID,
396fef20d9cSFrederic Weisbecker 	FORMAT_TYPE_LONG_LONG,
397fef20d9cSFrederic Weisbecker 	FORMAT_TYPE_ULONG,
398fef20d9cSFrederic Weisbecker 	FORMAT_TYPE_LONG,
399a4e94ef0SZhaolei 	FORMAT_TYPE_UBYTE,
400a4e94ef0SZhaolei 	FORMAT_TYPE_BYTE,
401fef20d9cSFrederic Weisbecker 	FORMAT_TYPE_USHORT,
402fef20d9cSFrederic Weisbecker 	FORMAT_TYPE_SHORT,
403fef20d9cSFrederic Weisbecker 	FORMAT_TYPE_UINT,
404fef20d9cSFrederic Weisbecker 	FORMAT_TYPE_INT,
405fef20d9cSFrederic Weisbecker 	FORMAT_TYPE_NRCHARS,
406fef20d9cSFrederic Weisbecker 	FORMAT_TYPE_SIZE_T,
407fef20d9cSFrederic Weisbecker 	FORMAT_TYPE_PTRDIFF
408fef20d9cSFrederic Weisbecker };
409fef20d9cSFrederic Weisbecker 
410fef20d9cSFrederic Weisbecker struct printf_spec {
411fef20d9cSFrederic Weisbecker 	enum format_type	type;
412fef20d9cSFrederic Weisbecker 	int			flags;		/* flags to number() */
413fef20d9cSFrederic Weisbecker 	int			field_width;	/* width of output field */
414fef20d9cSFrederic Weisbecker 	int			base;
415fef20d9cSFrederic Weisbecker 	int			precision;	/* # of digits/chars */
416fef20d9cSFrederic Weisbecker 	int			qualifier;
417fef20d9cSFrederic Weisbecker };
418fef20d9cSFrederic Weisbecker 
419fef20d9cSFrederic Weisbecker static char *number(char *buf, char *end, unsigned long long num,
420fef20d9cSFrederic Weisbecker 			struct printf_spec spec)
4211da177e4SLinus Torvalds {
4229b706aeeSDenys Vlasenko 	/* we are called with base 8, 10 or 16, only, thus don't need "G..."  */
4239b706aeeSDenys Vlasenko 	static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
4249b706aeeSDenys Vlasenko 
4259b706aeeSDenys Vlasenko 	char tmp[66];
4269b706aeeSDenys Vlasenko 	char sign;
4279b706aeeSDenys Vlasenko 	char locase;
428fef20d9cSFrederic Weisbecker 	int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
4291da177e4SLinus Torvalds 	int i;
4301da177e4SLinus Torvalds 
4319b706aeeSDenys Vlasenko 	/* locase = 0 or 0x20. ORing digits or letters with 'locase'
4329b706aeeSDenys Vlasenko 	 * produces same digits or (maybe lowercased) letters */
433fef20d9cSFrederic Weisbecker 	locase = (spec.flags & SMALL);
434fef20d9cSFrederic Weisbecker 	if (spec.flags & LEFT)
435fef20d9cSFrederic Weisbecker 		spec.flags &= ~ZEROPAD;
4361da177e4SLinus Torvalds 	sign = 0;
437fef20d9cSFrederic Weisbecker 	if (spec.flags & SIGN) {
4381da177e4SLinus Torvalds 		if ((signed long long)num < 0) {
4391da177e4SLinus Torvalds 			sign = '-';
4401da177e4SLinus Torvalds 			num = -(signed long long)num;
441fef20d9cSFrederic Weisbecker 			spec.field_width--;
442fef20d9cSFrederic Weisbecker 		} else if (spec.flags & PLUS) {
4431da177e4SLinus Torvalds 			sign = '+';
444fef20d9cSFrederic Weisbecker 			spec.field_width--;
445fef20d9cSFrederic Weisbecker 		} else if (spec.flags & SPACE) {
4461da177e4SLinus Torvalds 			sign = ' ';
447fef20d9cSFrederic Weisbecker 			spec.field_width--;
4481da177e4SLinus Torvalds 		}
4491da177e4SLinus Torvalds 	}
450b39a7340SDenis Vlasenko 	if (need_pfx) {
451fef20d9cSFrederic Weisbecker 		spec.field_width--;
452fef20d9cSFrederic Weisbecker 		if (spec.base == 16)
453fef20d9cSFrederic Weisbecker 			spec.field_width--;
4541da177e4SLinus Torvalds 	}
455b39a7340SDenis Vlasenko 
456b39a7340SDenis Vlasenko 	/* generate full string in tmp[], in reverse order */
4571da177e4SLinus Torvalds 	i = 0;
4581da177e4SLinus Torvalds 	if (num == 0)
4591da177e4SLinus Torvalds 		tmp[i++] = '0';
4604277eeddSDenis Vlasenko 	/* Generic code, for any base:
4614277eeddSDenis Vlasenko 	else do {
4629b706aeeSDenys Vlasenko 		tmp[i++] = (digits[do_div(num,base)] | locase);
4634277eeddSDenis Vlasenko 	} while (num != 0);
4644277eeddSDenis Vlasenko 	*/
465fef20d9cSFrederic Weisbecker 	else if (spec.base != 10) { /* 8 or 16 */
466fef20d9cSFrederic Weisbecker 		int mask = spec.base - 1;
467b39a7340SDenis Vlasenko 		int shift = 3;
4687b9186f5SAndré Goddard Rosa 
4697b9186f5SAndré Goddard Rosa 		if (spec.base == 16)
4707b9186f5SAndré Goddard Rosa 			shift = 4;
471b39a7340SDenis Vlasenko 		do {
4729b706aeeSDenys Vlasenko 			tmp[i++] = (digits[((unsigned char)num) & mask] | locase);
473b39a7340SDenis Vlasenko 			num >>= shift;
474b39a7340SDenis Vlasenko 		} while (num);
4754277eeddSDenis Vlasenko 	} else { /* base 10 */
4764277eeddSDenis Vlasenko 		i = put_dec(tmp, num) - tmp;
4774277eeddSDenis Vlasenko 	}
478b39a7340SDenis Vlasenko 
479b39a7340SDenis Vlasenko 	/* printing 100 using %2d gives "100", not "00" */
480fef20d9cSFrederic Weisbecker 	if (i > spec.precision)
481fef20d9cSFrederic Weisbecker 		spec.precision = i;
482b39a7340SDenis Vlasenko 	/* leading space padding */
483fef20d9cSFrederic Weisbecker 	spec.field_width -= spec.precision;
484fef20d9cSFrederic Weisbecker 	if (!(spec.flags & (ZEROPAD+LEFT))) {
485fef20d9cSFrederic Weisbecker 		while (--spec.field_width >= 0) {
486f796937aSJeremy Fitzhardinge 			if (buf < end)
4871da177e4SLinus Torvalds 				*buf = ' ';
4881da177e4SLinus Torvalds 			++buf;
4891da177e4SLinus Torvalds 		}
4901da177e4SLinus Torvalds 	}
491b39a7340SDenis Vlasenko 	/* sign */
4921da177e4SLinus Torvalds 	if (sign) {
493f796937aSJeremy Fitzhardinge 		if (buf < end)
4941da177e4SLinus Torvalds 			*buf = sign;
4951da177e4SLinus Torvalds 		++buf;
4961da177e4SLinus Torvalds 	}
497b39a7340SDenis Vlasenko 	/* "0x" / "0" prefix */
498b39a7340SDenis Vlasenko 	if (need_pfx) {
499f796937aSJeremy Fitzhardinge 		if (buf < end)
5001da177e4SLinus Torvalds 			*buf = '0';
5011da177e4SLinus Torvalds 		++buf;
502fef20d9cSFrederic Weisbecker 		if (spec.base == 16) {
503f796937aSJeremy Fitzhardinge 			if (buf < end)
5049b706aeeSDenys Vlasenko 				*buf = ('X' | locase);
5051da177e4SLinus Torvalds 			++buf;
5061da177e4SLinus Torvalds 		}
5071da177e4SLinus Torvalds 	}
508b39a7340SDenis Vlasenko 	/* zero or space padding */
509fef20d9cSFrederic Weisbecker 	if (!(spec.flags & LEFT)) {
510fef20d9cSFrederic Weisbecker 		char c = (spec.flags & ZEROPAD) ? '0' : ' ';
511fef20d9cSFrederic Weisbecker 		while (--spec.field_width >= 0) {
512f796937aSJeremy Fitzhardinge 			if (buf < end)
5131da177e4SLinus Torvalds 				*buf = c;
5141da177e4SLinus Torvalds 			++buf;
5151da177e4SLinus Torvalds 		}
5161da177e4SLinus Torvalds 	}
517b39a7340SDenis Vlasenko 	/* hmm even more zero padding? */
518fef20d9cSFrederic Weisbecker 	while (i <= --spec.precision) {
519f796937aSJeremy Fitzhardinge 		if (buf < end)
5201da177e4SLinus Torvalds 			*buf = '0';
5211da177e4SLinus Torvalds 		++buf;
5221da177e4SLinus Torvalds 	}
523b39a7340SDenis Vlasenko 	/* actual digits of result */
524b39a7340SDenis Vlasenko 	while (--i >= 0) {
525f796937aSJeremy Fitzhardinge 		if (buf < end)
5261da177e4SLinus Torvalds 			*buf = tmp[i];
5271da177e4SLinus Torvalds 		++buf;
5281da177e4SLinus Torvalds 	}
529b39a7340SDenis Vlasenko 	/* trailing space padding */
530fef20d9cSFrederic Weisbecker 	while (--spec.field_width >= 0) {
531f796937aSJeremy Fitzhardinge 		if (buf < end)
5321da177e4SLinus Torvalds 			*buf = ' ';
5331da177e4SLinus Torvalds 		++buf;
5341da177e4SLinus Torvalds 	}
5357b9186f5SAndré Goddard Rosa 
5361da177e4SLinus Torvalds 	return buf;
5371da177e4SLinus Torvalds }
5381da177e4SLinus Torvalds 
5390f4f81dcSAndré Goddard Rosa static char *string(char *buf, char *end, const char *s, struct printf_spec spec)
5400f9bfa56SLinus Torvalds {
5410f9bfa56SLinus Torvalds 	int len, i;
5420f9bfa56SLinus Torvalds 
5430f9bfa56SLinus Torvalds 	if ((unsigned long)s < PAGE_SIZE)
5440f4f81dcSAndré Goddard Rosa 		s = "(null)";
5450f9bfa56SLinus Torvalds 
546fef20d9cSFrederic Weisbecker 	len = strnlen(s, spec.precision);
5470f9bfa56SLinus Torvalds 
548fef20d9cSFrederic Weisbecker 	if (!(spec.flags & LEFT)) {
549fef20d9cSFrederic Weisbecker 		while (len < spec.field_width--) {
5500f9bfa56SLinus Torvalds 			if (buf < end)
5510f9bfa56SLinus Torvalds 				*buf = ' ';
5520f9bfa56SLinus Torvalds 			++buf;
5530f9bfa56SLinus Torvalds 		}
5540f9bfa56SLinus Torvalds 	}
5550f9bfa56SLinus Torvalds 	for (i = 0; i < len; ++i) {
5560f9bfa56SLinus Torvalds 		if (buf < end)
5570f9bfa56SLinus Torvalds 			*buf = *s;
5580f9bfa56SLinus Torvalds 		++buf; ++s;
5590f9bfa56SLinus Torvalds 	}
560fef20d9cSFrederic Weisbecker 	while (len < spec.field_width--) {
5610f9bfa56SLinus Torvalds 		if (buf < end)
5620f9bfa56SLinus Torvalds 			*buf = ' ';
5630f9bfa56SLinus Torvalds 		++buf;
5640f9bfa56SLinus Torvalds 	}
5657b9186f5SAndré Goddard Rosa 
5660f9bfa56SLinus Torvalds 	return buf;
5670f9bfa56SLinus Torvalds }
5680f9bfa56SLinus Torvalds 
569fef20d9cSFrederic Weisbecker static char *symbol_string(char *buf, char *end, void *ptr,
5700c8b946eSFrederic Weisbecker 				struct printf_spec spec, char ext)
5710fe1ef24SLinus Torvalds {
5720fe1ef24SLinus Torvalds 	unsigned long value = (unsigned long) ptr;
5730fe1ef24SLinus Torvalds #ifdef CONFIG_KALLSYMS
5740fe1ef24SLinus Torvalds 	char sym[KSYM_SYMBOL_LEN];
57591adcd2cSSteven Rostedt 	if (ext != 'f' && ext != 's')
5760fe1ef24SLinus Torvalds 		sprint_symbol(sym, value);
5770c8b946eSFrederic Weisbecker 	else
5780c8b946eSFrederic Weisbecker 		kallsyms_lookup(value, NULL, NULL, NULL, sym);
5797b9186f5SAndré Goddard Rosa 
580fef20d9cSFrederic Weisbecker 	return string(buf, end, sym, spec);
5810fe1ef24SLinus Torvalds #else
582fef20d9cSFrederic Weisbecker 	spec.field_width = 2 * sizeof(void *);
583fef20d9cSFrederic Weisbecker 	spec.flags |= SPECIAL | SMALL | ZEROPAD;
584fef20d9cSFrederic Weisbecker 	spec.base = 16;
5857b9186f5SAndré Goddard Rosa 
586fef20d9cSFrederic Weisbecker 	return number(buf, end, value, spec);
5870fe1ef24SLinus Torvalds #endif
5880fe1ef24SLinus Torvalds }
5890fe1ef24SLinus Torvalds 
590fef20d9cSFrederic Weisbecker static char *resource_string(char *buf, char *end, struct resource *res,
591fd95541eSBjorn Helgaas 				struct printf_spec spec, const char *fmt)
592332d2e78SLinus Torvalds {
593332d2e78SLinus Torvalds #ifndef IO_RSRC_PRINTK_SIZE
59428405372SBjorn Helgaas #define IO_RSRC_PRINTK_SIZE	6
595332d2e78SLinus Torvalds #endif
596332d2e78SLinus Torvalds 
597332d2e78SLinus Torvalds #ifndef MEM_RSRC_PRINTK_SIZE
59828405372SBjorn Helgaas #define MEM_RSRC_PRINTK_SIZE	10
599332d2e78SLinus Torvalds #endif
600c91d3376SBjorn Helgaas 	struct printf_spec hex_spec = {
601fef20d9cSFrederic Weisbecker 		.base = 16,
602fef20d9cSFrederic Weisbecker 		.precision = -1,
603fef20d9cSFrederic Weisbecker 		.flags = SPECIAL | SMALL | ZEROPAD,
604fef20d9cSFrederic Weisbecker 	};
605c91d3376SBjorn Helgaas 	struct printf_spec dec_spec = {
606c91d3376SBjorn Helgaas 		.base = 10,
607c91d3376SBjorn Helgaas 		.precision = -1,
608c91d3376SBjorn Helgaas 		.flags = 0,
609c91d3376SBjorn Helgaas 	};
610fd95541eSBjorn Helgaas 	struct printf_spec str_spec = {
611fd95541eSBjorn Helgaas 		.field_width = -1,
612fd95541eSBjorn Helgaas 		.precision = 10,
613fd95541eSBjorn Helgaas 		.flags = LEFT,
614fd95541eSBjorn Helgaas 	};
615fd95541eSBjorn Helgaas 	struct printf_spec flag_spec = {
616fd95541eSBjorn Helgaas 		.base = 16,
617fd95541eSBjorn Helgaas 		.precision = -1,
618fd95541eSBjorn Helgaas 		.flags = SPECIAL | SMALL,
619fd95541eSBjorn Helgaas 	};
620c7dabef8SBjorn Helgaas 
621c7dabef8SBjorn Helgaas 	/* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
622c7dabef8SBjorn Helgaas 	 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
623c7dabef8SBjorn Helgaas #define RSRC_BUF_SIZE		((2 * sizeof(resource_size_t)) + 4)
624c7dabef8SBjorn Helgaas #define FLAG_BUF_SIZE		(2 * sizeof(res->flags))
625c7dabef8SBjorn Helgaas #define DECODED_BUF_SIZE	sizeof("[mem - 64bit pref disabled]")
626c7dabef8SBjorn Helgaas #define RAW_BUF_SIZE		sizeof("[mem - flags 0x]")
627c7dabef8SBjorn Helgaas 	char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
628c7dabef8SBjorn Helgaas 		     2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
629c7dabef8SBjorn Helgaas 
630332d2e78SLinus Torvalds 	char *p = sym, *pend = sym + sizeof(sym);
631c91d3376SBjorn Helgaas 	int size = -1, addr = 0;
632c7dabef8SBjorn Helgaas 	int decode = (fmt[0] == 'R') ? 1 : 0;
633332d2e78SLinus Torvalds 
634c91d3376SBjorn Helgaas 	if (res->flags & IORESOURCE_IO) {
635332d2e78SLinus Torvalds 		size = IO_RSRC_PRINTK_SIZE;
636c91d3376SBjorn Helgaas 		addr = 1;
637c91d3376SBjorn Helgaas 	} else if (res->flags & IORESOURCE_MEM) {
638332d2e78SLinus Torvalds 		size = MEM_RSRC_PRINTK_SIZE;
639c91d3376SBjorn Helgaas 		addr = 1;
640c91d3376SBjorn Helgaas 	}
641332d2e78SLinus Torvalds 
642332d2e78SLinus Torvalds 	*p++ = '[';
643fd95541eSBjorn Helgaas 	if (res->flags & IORESOURCE_IO)
644fd95541eSBjorn Helgaas 		p = string(p, pend, "io  ", str_spec);
645fd95541eSBjorn Helgaas 	else if (res->flags & IORESOURCE_MEM)
646fd95541eSBjorn Helgaas 		p = string(p, pend, "mem ", str_spec);
647fd95541eSBjorn Helgaas 	else if (res->flags & IORESOURCE_IRQ)
648fd95541eSBjorn Helgaas 		p = string(p, pend, "irq ", str_spec);
649fd95541eSBjorn Helgaas 	else if (res->flags & IORESOURCE_DMA)
650fd95541eSBjorn Helgaas 		p = string(p, pend, "dma ", str_spec);
651c7dabef8SBjorn Helgaas 	else {
652c7dabef8SBjorn Helgaas 		p = string(p, pend, "??? ", str_spec);
653c7dabef8SBjorn Helgaas 		decode = 0;
654fd95541eSBjorn Helgaas 	}
655c91d3376SBjorn Helgaas 	hex_spec.field_width = size;
656c91d3376SBjorn Helgaas 	p = number(p, pend, res->start, addr ? hex_spec : dec_spec);
657c91d3376SBjorn Helgaas 	if (res->start != res->end) {
658332d2e78SLinus Torvalds 		*p++ = '-';
659c91d3376SBjorn Helgaas 		p = number(p, pend, res->end, addr ? hex_spec : dec_spec);
660c91d3376SBjorn Helgaas 	}
661c7dabef8SBjorn Helgaas 	if (decode) {
662fd95541eSBjorn Helgaas 		if (res->flags & IORESOURCE_MEM_64)
663fd95541eSBjorn Helgaas 			p = string(p, pend, " 64bit", str_spec);
664fd95541eSBjorn Helgaas 		if (res->flags & IORESOURCE_PREFETCH)
665fd95541eSBjorn Helgaas 			p = string(p, pend, " pref", str_spec);
666fd95541eSBjorn Helgaas 		if (res->flags & IORESOURCE_DISABLED)
667fd95541eSBjorn Helgaas 			p = string(p, pend, " disabled", str_spec);
668c7dabef8SBjorn Helgaas 	} else {
669fd95541eSBjorn Helgaas 		p = string(p, pend, " flags ", str_spec);
670c7dabef8SBjorn Helgaas 		p = number(p, pend, res->flags, flag_spec);
671fd95541eSBjorn Helgaas 	}
672332d2e78SLinus Torvalds 	*p++ = ']';
673c7dabef8SBjorn Helgaas 	*p = '\0';
674332d2e78SLinus Torvalds 
675fef20d9cSFrederic Weisbecker 	return string(buf, end, sym, spec);
676332d2e78SLinus Torvalds }
677332d2e78SLinus Torvalds 
678fef20d9cSFrederic Weisbecker static char *mac_address_string(char *buf, char *end, u8 *addr,
6798a27f7c9SJoe Perches 				struct printf_spec spec, const char *fmt)
680dd45c9cfSHarvey Harrison {
6818a27f7c9SJoe Perches 	char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
682dd45c9cfSHarvey Harrison 	char *p = mac_addr;
683dd45c9cfSHarvey Harrison 	int i;
684bc7259a2SJoe Perches 	char separator;
685bc7259a2SJoe Perches 
686bc7259a2SJoe Perches 	if (fmt[1] == 'F') {		/* FDDI canonical format */
687bc7259a2SJoe Perches 		separator = '-';
688bc7259a2SJoe Perches 	} else {
689bc7259a2SJoe Perches 		separator = ':';
690bc7259a2SJoe Perches 	}
691dd45c9cfSHarvey Harrison 
692dd45c9cfSHarvey Harrison 	for (i = 0; i < 6; i++) {
693*c8e00060SJoe Perches 		p = pack_hex_byte(p, addr[i]);
6948a27f7c9SJoe Perches 		if (fmt[0] == 'M' && i != 5)
695bc7259a2SJoe Perches 			*p++ = separator;
696dd45c9cfSHarvey Harrison 	}
697dd45c9cfSHarvey Harrison 	*p = '\0';
698dd45c9cfSHarvey Harrison 
699fef20d9cSFrederic Weisbecker 	return string(buf, end, mac_addr, spec);
700dd45c9cfSHarvey Harrison }
701dd45c9cfSHarvey Harrison 
7028a27f7c9SJoe Perches static char *ip4_string(char *p, const u8 *addr, bool leading_zeros)
703689afa7dSHarvey Harrison {
704689afa7dSHarvey Harrison 	int i;
705689afa7dSHarvey Harrison 
7068a27f7c9SJoe Perches 	for (i = 0; i < 4; i++) {
7078a27f7c9SJoe Perches 		char temp[3];	/* hold each IP quad in reverse order */
7088a27f7c9SJoe Perches 		int digits = put_dec_trunc(temp, addr[i]) - temp;
7098a27f7c9SJoe Perches 		if (leading_zeros) {
7108a27f7c9SJoe Perches 			if (digits < 3)
7118a27f7c9SJoe Perches 				*p++ = '0';
7128a27f7c9SJoe Perches 			if (digits < 2)
7138a27f7c9SJoe Perches 				*p++ = '0';
7148a27f7c9SJoe Perches 		}
7158a27f7c9SJoe Perches 		/* reverse the digits in the quad */
7168a27f7c9SJoe Perches 		while (digits--)
7178a27f7c9SJoe Perches 			*p++ = temp[digits];
7188a27f7c9SJoe Perches 		if (i < 3)
7198a27f7c9SJoe Perches 			*p++ = '.';
7208a27f7c9SJoe Perches 	}
7218a27f7c9SJoe Perches 	*p = '\0';
7227b9186f5SAndré Goddard Rosa 
7238a27f7c9SJoe Perches 	return p;
7248a27f7c9SJoe Perches }
7258a27f7c9SJoe Perches 
726eb78cd26SJoe Perches static char *ip6_compressed_string(char *p, const char *addr)
7278a27f7c9SJoe Perches {
7287b9186f5SAndré Goddard Rosa 	int i, j, range;
7298a27f7c9SJoe Perches 	unsigned char zerolength[8];
7308a27f7c9SJoe Perches 	int longest = 1;
7318a27f7c9SJoe Perches 	int colonpos = -1;
7328a27f7c9SJoe Perches 	u16 word;
7337b9186f5SAndré Goddard Rosa 	u8 hi, lo;
7348a27f7c9SJoe Perches 	bool needcolon = false;
735eb78cd26SJoe Perches 	bool useIPv4;
736eb78cd26SJoe Perches 	struct in6_addr in6;
737eb78cd26SJoe Perches 
738eb78cd26SJoe Perches 	memcpy(&in6, addr, sizeof(struct in6_addr));
739eb78cd26SJoe Perches 
740eb78cd26SJoe Perches 	useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
7418a27f7c9SJoe Perches 
7428a27f7c9SJoe Perches 	memset(zerolength, 0, sizeof(zerolength));
7438a27f7c9SJoe Perches 
7448a27f7c9SJoe Perches 	if (useIPv4)
7458a27f7c9SJoe Perches 		range = 6;
7468a27f7c9SJoe Perches 	else
7478a27f7c9SJoe Perches 		range = 8;
7488a27f7c9SJoe Perches 
7498a27f7c9SJoe Perches 	/* find position of longest 0 run */
7508a27f7c9SJoe Perches 	for (i = 0; i < range; i++) {
7518a27f7c9SJoe Perches 		for (j = i; j < range; j++) {
752eb78cd26SJoe Perches 			if (in6.s6_addr16[j] != 0)
7538a27f7c9SJoe Perches 				break;
7548a27f7c9SJoe Perches 			zerolength[i]++;
7558a27f7c9SJoe Perches 		}
7568a27f7c9SJoe Perches 	}
7578a27f7c9SJoe Perches 	for (i = 0; i < range; i++) {
7588a27f7c9SJoe Perches 		if (zerolength[i] > longest) {
7598a27f7c9SJoe Perches 			longest = zerolength[i];
7608a27f7c9SJoe Perches 			colonpos = i;
7618a27f7c9SJoe Perches 		}
7628a27f7c9SJoe Perches 	}
7638a27f7c9SJoe Perches 
7648a27f7c9SJoe Perches 	/* emit address */
7658a27f7c9SJoe Perches 	for (i = 0; i < range; i++) {
7668a27f7c9SJoe Perches 		if (i == colonpos) {
7678a27f7c9SJoe Perches 			if (needcolon || i == 0)
7688a27f7c9SJoe Perches 				*p++ = ':';
7698a27f7c9SJoe Perches 			*p++ = ':';
7708a27f7c9SJoe Perches 			needcolon = false;
7718a27f7c9SJoe Perches 			i += longest - 1;
7728a27f7c9SJoe Perches 			continue;
7738a27f7c9SJoe Perches 		}
7748a27f7c9SJoe Perches 		if (needcolon) {
7758a27f7c9SJoe Perches 			*p++ = ':';
7768a27f7c9SJoe Perches 			needcolon = false;
7778a27f7c9SJoe Perches 		}
7788a27f7c9SJoe Perches 		/* hex u16 without leading 0s */
779eb78cd26SJoe Perches 		word = ntohs(in6.s6_addr16[i]);
7808a27f7c9SJoe Perches 		hi = word >> 8;
7818a27f7c9SJoe Perches 		lo = word & 0xff;
7828a27f7c9SJoe Perches 		if (hi) {
7838a27f7c9SJoe Perches 			if (hi > 0x0f)
7848a27f7c9SJoe Perches 				p = pack_hex_byte(p, hi);
7858a27f7c9SJoe Perches 			else
7868a27f7c9SJoe Perches 				*p++ = hex_asc_lo(hi);
787b5ff992bSAndré Goddard Rosa 			p = pack_hex_byte(p, lo);
7888a27f7c9SJoe Perches 		}
789b5ff992bSAndré Goddard Rosa 		else if (lo > 0x0f)
7908a27f7c9SJoe Perches 			p = pack_hex_byte(p, lo);
7918a27f7c9SJoe Perches 		else
7928a27f7c9SJoe Perches 			*p++ = hex_asc_lo(lo);
7938a27f7c9SJoe Perches 		needcolon = true;
7948a27f7c9SJoe Perches 	}
7958a27f7c9SJoe Perches 
7968a27f7c9SJoe Perches 	if (useIPv4) {
7978a27f7c9SJoe Perches 		if (needcolon)
7988a27f7c9SJoe Perches 			*p++ = ':';
799eb78cd26SJoe Perches 		p = ip4_string(p, &in6.s6_addr[12], false);
8008a27f7c9SJoe Perches 	}
8018a27f7c9SJoe Perches 	*p = '\0';
8027b9186f5SAndré Goddard Rosa 
8038a27f7c9SJoe Perches 	return p;
8048a27f7c9SJoe Perches }
8058a27f7c9SJoe Perches 
806eb78cd26SJoe Perches static char *ip6_string(char *p, const char *addr, const char *fmt)
8078a27f7c9SJoe Perches {
8088a27f7c9SJoe Perches 	int i;
8097b9186f5SAndré Goddard Rosa 
810689afa7dSHarvey Harrison 	for (i = 0; i < 8; i++) {
811eb78cd26SJoe Perches 		p = pack_hex_byte(p, *addr++);
812eb78cd26SJoe Perches 		p = pack_hex_byte(p, *addr++);
8138a27f7c9SJoe Perches 		if (fmt[0] == 'I' && i != 7)
814689afa7dSHarvey Harrison 			*p++ = ':';
815689afa7dSHarvey Harrison 	}
816689afa7dSHarvey Harrison 	*p = '\0';
8177b9186f5SAndré Goddard Rosa 
8188a27f7c9SJoe Perches 	return p;
8198a27f7c9SJoe Perches }
8208a27f7c9SJoe Perches 
8218a27f7c9SJoe Perches static char *ip6_addr_string(char *buf, char *end, const u8 *addr,
8228a27f7c9SJoe Perches 			     struct printf_spec spec, const char *fmt)
8238a27f7c9SJoe Perches {
8248a27f7c9SJoe Perches 	char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
8258a27f7c9SJoe Perches 
8268a27f7c9SJoe Perches 	if (fmt[0] == 'I' && fmt[2] == 'c')
827eb78cd26SJoe Perches 		ip6_compressed_string(ip6_addr, addr);
8288a27f7c9SJoe Perches 	else
829eb78cd26SJoe Perches 		ip6_string(ip6_addr, addr, fmt);
830689afa7dSHarvey Harrison 
831fef20d9cSFrederic Weisbecker 	return string(buf, end, ip6_addr, spec);
832689afa7dSHarvey Harrison }
833689afa7dSHarvey Harrison 
8348a27f7c9SJoe Perches static char *ip4_addr_string(char *buf, char *end, const u8 *addr,
8358a27f7c9SJoe Perches 			     struct printf_spec spec, const char *fmt)
8364aa99606SHarvey Harrison {
8378a27f7c9SJoe Perches 	char ip4_addr[sizeof("255.255.255.255")];
8384aa99606SHarvey Harrison 
8398a27f7c9SJoe Perches 	ip4_string(ip4_addr, addr, fmt[0] == 'i');
8404aa99606SHarvey Harrison 
841fef20d9cSFrederic Weisbecker 	return string(buf, end, ip4_addr, spec);
8424aa99606SHarvey Harrison }
8434aa99606SHarvey Harrison 
8449ac6e44eSJoe Perches static char *uuid_string(char *buf, char *end, const u8 *addr,
8459ac6e44eSJoe Perches 			 struct printf_spec spec, const char *fmt)
8469ac6e44eSJoe Perches {
8479ac6e44eSJoe Perches 	char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
8489ac6e44eSJoe Perches 	char *p = uuid;
8499ac6e44eSJoe Perches 	int i;
8509ac6e44eSJoe Perches 	static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
8519ac6e44eSJoe Perches 	static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
8529ac6e44eSJoe Perches 	const u8 *index = be;
8539ac6e44eSJoe Perches 	bool uc = false;
8549ac6e44eSJoe Perches 
8559ac6e44eSJoe Perches 	switch (*(++fmt)) {
8569ac6e44eSJoe Perches 	case 'L':
8579ac6e44eSJoe Perches 		uc = true;		/* fall-through */
8589ac6e44eSJoe Perches 	case 'l':
8599ac6e44eSJoe Perches 		index = le;
8609ac6e44eSJoe Perches 		break;
8619ac6e44eSJoe Perches 	case 'B':
8629ac6e44eSJoe Perches 		uc = true;
8639ac6e44eSJoe Perches 		break;
8649ac6e44eSJoe Perches 	}
8659ac6e44eSJoe Perches 
8669ac6e44eSJoe Perches 	for (i = 0; i < 16; i++) {
8679ac6e44eSJoe Perches 		p = pack_hex_byte(p, addr[index[i]]);
8689ac6e44eSJoe Perches 		switch (i) {
8699ac6e44eSJoe Perches 		case 3:
8709ac6e44eSJoe Perches 		case 5:
8719ac6e44eSJoe Perches 		case 7:
8729ac6e44eSJoe Perches 		case 9:
8739ac6e44eSJoe Perches 			*p++ = '-';
8749ac6e44eSJoe Perches 			break;
8759ac6e44eSJoe Perches 		}
8769ac6e44eSJoe Perches 	}
8779ac6e44eSJoe Perches 
8789ac6e44eSJoe Perches 	*p = 0;
8799ac6e44eSJoe Perches 
8809ac6e44eSJoe Perches 	if (uc) {
8819ac6e44eSJoe Perches 		p = uuid;
8829ac6e44eSJoe Perches 		do {
8839ac6e44eSJoe Perches 			*p = toupper(*p);
8849ac6e44eSJoe Perches 		} while (*(++p));
8859ac6e44eSJoe Perches 	}
8869ac6e44eSJoe Perches 
8879ac6e44eSJoe Perches 	return string(buf, end, uuid, spec);
8889ac6e44eSJoe Perches }
8899ac6e44eSJoe Perches 
8904d8a743cSLinus Torvalds /*
8914d8a743cSLinus Torvalds  * Show a '%p' thing.  A kernel extension is that the '%p' is followed
8924d8a743cSLinus Torvalds  * by an extra set of alphanumeric characters that are extended format
8934d8a743cSLinus Torvalds  * specifiers.
8944d8a743cSLinus Torvalds  *
895332d2e78SLinus Torvalds  * Right now we handle:
8960fe1ef24SLinus Torvalds  *
8970c8b946eSFrederic Weisbecker  * - 'F' For symbolic function descriptor pointers with offset
8980c8b946eSFrederic Weisbecker  * - 'f' For simple symbolic function names without offset
8990efb4d20SSteven Rostedt  * - 'S' For symbolic direct pointers with offset
9000efb4d20SSteven Rostedt  * - 's' For symbolic direct pointers without offset
901c7dabef8SBjorn Helgaas  * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
902c7dabef8SBjorn Helgaas  * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
903dd45c9cfSHarvey Harrison  * - 'M' For a 6-byte MAC address, it prints the address in the
904dd45c9cfSHarvey Harrison  *       usual colon-separated hex notation
9058a27f7c9SJoe Perches  * - 'm' For a 6-byte MAC address, it prints the hex address without colons
906bc7259a2SJoe Perches  * - 'MF' For a 6-byte MAC FDDI address, it prints the address
907*c8e00060SJoe Perches  *       with a dash-separated hex notation
9088a27f7c9SJoe Perches  * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
9098a27f7c9SJoe Perches  *       IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
9108a27f7c9SJoe Perches  *       IPv6 uses colon separated network-order 16 bit hex with leading 0's
9118a27f7c9SJoe Perches  * - 'i' [46] for 'raw' IPv4/IPv6 addresses
9128a27f7c9SJoe Perches  *       IPv6 omits the colons (01020304...0f)
9138a27f7c9SJoe Perches  *       IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
9148a27f7c9SJoe Perches  * - 'I6c' for IPv6 addresses printed as specified by
9158a27f7c9SJoe Perches  *       http://www.ietf.org/id/draft-kawamura-ipv6-text-representation-03.txt
9169ac6e44eSJoe Perches  * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
9179ac6e44eSJoe Perches  *       "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
9189ac6e44eSJoe Perches  *       Options for %pU are:
9199ac6e44eSJoe Perches  *         b big endian lower case hex (default)
9209ac6e44eSJoe Perches  *         B big endian UPPER case hex
9219ac6e44eSJoe Perches  *         l little endian lower case hex
9229ac6e44eSJoe Perches  *         L little endian UPPER case hex
9239ac6e44eSJoe Perches  *           big endian output byte order is:
9249ac6e44eSJoe Perches  *             [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
9259ac6e44eSJoe Perches  *           little endian output byte order is:
9269ac6e44eSJoe Perches  *             [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
9279ac6e44eSJoe Perches  *
928332d2e78SLinus Torvalds  * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
929332d2e78SLinus Torvalds  * function pointers are really function descriptors, which contain a
930332d2e78SLinus Torvalds  * pointer to the real address.
9314d8a743cSLinus Torvalds  */
932fef20d9cSFrederic Weisbecker static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
933fef20d9cSFrederic Weisbecker 			struct printf_spec spec)
93478a8bf69SLinus Torvalds {
935d97106abSLinus Torvalds 	if (!ptr)
936fef20d9cSFrederic Weisbecker 		return string(buf, end, "(null)", spec);
937d97106abSLinus Torvalds 
9380fe1ef24SLinus Torvalds 	switch (*fmt) {
9390fe1ef24SLinus Torvalds 	case 'F':
9400c8b946eSFrederic Weisbecker 	case 'f':
9410fe1ef24SLinus Torvalds 		ptr = dereference_function_descriptor(ptr);
9420fe1ef24SLinus Torvalds 		/* Fallthrough */
9430fe1ef24SLinus Torvalds 	case 'S':
9449ac6e44eSJoe Perches 	case 's':
9450c8b946eSFrederic Weisbecker 		return symbol_string(buf, end, ptr, spec, *fmt);
946332d2e78SLinus Torvalds 	case 'R':
947c7dabef8SBjorn Helgaas 	case 'r':
948fd95541eSBjorn Helgaas 		return resource_string(buf, end, ptr, spec, fmt);
9498a27f7c9SJoe Perches 	case 'M':			/* Colon separated: 00:01:02:03:04:05 */
9508a27f7c9SJoe Perches 	case 'm':			/* Contiguous: 000102030405 */
951bc7259a2SJoe Perches 					/* [mM]F (FDDI, bit reversed) */
9528a27f7c9SJoe Perches 		return mac_address_string(buf, end, ptr, spec, fmt);
9538a27f7c9SJoe Perches 	case 'I':			/* Formatted IP supported
9548a27f7c9SJoe Perches 					 * 4:	1.2.3.4
9558a27f7c9SJoe Perches 					 * 6:	0001:0203:...:0708
9568a27f7c9SJoe Perches 					 * 6c:	1::708 or 1::1.2.3.4
9578a27f7c9SJoe Perches 					 */
9588a27f7c9SJoe Perches 	case 'i':			/* Contiguous:
9598a27f7c9SJoe Perches 					 * 4:	001.002.003.004
9608a27f7c9SJoe Perches 					 * 6:   000102...0f
9618a27f7c9SJoe Perches 					 */
9628a27f7c9SJoe Perches 		switch (fmt[1]) {
9638a27f7c9SJoe Perches 		case '6':
9648a27f7c9SJoe Perches 			return ip6_addr_string(buf, end, ptr, spec, fmt);
9658a27f7c9SJoe Perches 		case '4':
9668a27f7c9SJoe Perches 			return ip4_addr_string(buf, end, ptr, spec, fmt);
9678a27f7c9SJoe Perches 		}
9684aa99606SHarvey Harrison 		break;
9699ac6e44eSJoe Perches 	case 'U':
9709ac6e44eSJoe Perches 		return uuid_string(buf, end, ptr, spec, fmt);
9710fe1ef24SLinus Torvalds 	}
972fef20d9cSFrederic Weisbecker 	spec.flags |= SMALL;
973fef20d9cSFrederic Weisbecker 	if (spec.field_width == -1) {
974fef20d9cSFrederic Weisbecker 		spec.field_width = 2*sizeof(void *);
975fef20d9cSFrederic Weisbecker 		spec.flags |= ZEROPAD;
97678a8bf69SLinus Torvalds 	}
977fef20d9cSFrederic Weisbecker 	spec.base = 16;
978fef20d9cSFrederic Weisbecker 
979fef20d9cSFrederic Weisbecker 	return number(buf, end, (unsigned long) ptr, spec);
980fef20d9cSFrederic Weisbecker }
981fef20d9cSFrederic Weisbecker 
982fef20d9cSFrederic Weisbecker /*
983fef20d9cSFrederic Weisbecker  * Helper function to decode printf style format.
984fef20d9cSFrederic Weisbecker  * Each call decode a token from the format and return the
985fef20d9cSFrederic Weisbecker  * number of characters read (or likely the delta where it wants
986fef20d9cSFrederic Weisbecker  * to go on the next call).
987fef20d9cSFrederic Weisbecker  * The decoded token is returned through the parameters
988fef20d9cSFrederic Weisbecker  *
989fef20d9cSFrederic Weisbecker  * 'h', 'l', or 'L' for integer fields
990fef20d9cSFrederic Weisbecker  * 'z' support added 23/7/1999 S.H.
991fef20d9cSFrederic Weisbecker  * 'z' changed to 'Z' --davidm 1/25/99
992fef20d9cSFrederic Weisbecker  * 't' added for ptrdiff_t
993fef20d9cSFrederic Weisbecker  *
994fef20d9cSFrederic Weisbecker  * @fmt: the format string
995fef20d9cSFrederic Weisbecker  * @type of the token returned
996fef20d9cSFrederic Weisbecker  * @flags: various flags such as +, -, # tokens..
997fef20d9cSFrederic Weisbecker  * @field_width: overwritten width
998fef20d9cSFrederic Weisbecker  * @base: base of the number (octal, hex, ...)
999fef20d9cSFrederic Weisbecker  * @precision: precision of a number
1000fef20d9cSFrederic Weisbecker  * @qualifier: qualifier of a number (long, size_t, ...)
1001fef20d9cSFrederic Weisbecker  */
1002fef20d9cSFrederic Weisbecker static int format_decode(const char *fmt, struct printf_spec *spec)
1003fef20d9cSFrederic Weisbecker {
1004fef20d9cSFrederic Weisbecker 	const char *start = fmt;
1005fef20d9cSFrederic Weisbecker 
1006fef20d9cSFrederic Weisbecker 	/* we finished early by reading the field width */
1007ed681a91SVegard Nossum 	if (spec->type == FORMAT_TYPE_WIDTH) {
1008fef20d9cSFrederic Weisbecker 		if (spec->field_width < 0) {
1009fef20d9cSFrederic Weisbecker 			spec->field_width = -spec->field_width;
1010fef20d9cSFrederic Weisbecker 			spec->flags |= LEFT;
1011fef20d9cSFrederic Weisbecker 		}
1012fef20d9cSFrederic Weisbecker 		spec->type = FORMAT_TYPE_NONE;
1013fef20d9cSFrederic Weisbecker 		goto precision;
1014fef20d9cSFrederic Weisbecker 	}
1015fef20d9cSFrederic Weisbecker 
1016fef20d9cSFrederic Weisbecker 	/* we finished early by reading the precision */
1017fef20d9cSFrederic Weisbecker 	if (spec->type == FORMAT_TYPE_PRECISION) {
1018fef20d9cSFrederic Weisbecker 		if (spec->precision < 0)
1019fef20d9cSFrederic Weisbecker 			spec->precision = 0;
1020fef20d9cSFrederic Weisbecker 
1021fef20d9cSFrederic Weisbecker 		spec->type = FORMAT_TYPE_NONE;
1022fef20d9cSFrederic Weisbecker 		goto qualifier;
1023fef20d9cSFrederic Weisbecker 	}
1024fef20d9cSFrederic Weisbecker 
1025fef20d9cSFrederic Weisbecker 	/* By default */
1026fef20d9cSFrederic Weisbecker 	spec->type = FORMAT_TYPE_NONE;
1027fef20d9cSFrederic Weisbecker 
1028fef20d9cSFrederic Weisbecker 	for (; *fmt ; ++fmt) {
1029fef20d9cSFrederic Weisbecker 		if (*fmt == '%')
1030fef20d9cSFrederic Weisbecker 			break;
1031fef20d9cSFrederic Weisbecker 	}
1032fef20d9cSFrederic Weisbecker 
1033fef20d9cSFrederic Weisbecker 	/* Return the current non-format string */
1034fef20d9cSFrederic Weisbecker 	if (fmt != start || !*fmt)
1035fef20d9cSFrederic Weisbecker 		return fmt - start;
1036fef20d9cSFrederic Weisbecker 
1037fef20d9cSFrederic Weisbecker 	/* Process flags */
1038fef20d9cSFrederic Weisbecker 	spec->flags = 0;
1039fef20d9cSFrederic Weisbecker 
1040fef20d9cSFrederic Weisbecker 	while (1) { /* this also skips first '%' */
1041fef20d9cSFrederic Weisbecker 		bool found = true;
1042fef20d9cSFrederic Weisbecker 
1043fef20d9cSFrederic Weisbecker 		++fmt;
1044fef20d9cSFrederic Weisbecker 
1045fef20d9cSFrederic Weisbecker 		switch (*fmt) {
1046fef20d9cSFrederic Weisbecker 		case '-': spec->flags |= LEFT;    break;
1047fef20d9cSFrederic Weisbecker 		case '+': spec->flags |= PLUS;    break;
1048fef20d9cSFrederic Weisbecker 		case ' ': spec->flags |= SPACE;   break;
1049fef20d9cSFrederic Weisbecker 		case '#': spec->flags |= SPECIAL; break;
1050fef20d9cSFrederic Weisbecker 		case '0': spec->flags |= ZEROPAD; break;
1051fef20d9cSFrederic Weisbecker 		default:  found = false;
1052fef20d9cSFrederic Weisbecker 		}
1053fef20d9cSFrederic Weisbecker 
1054fef20d9cSFrederic Weisbecker 		if (!found)
1055fef20d9cSFrederic Weisbecker 			break;
1056fef20d9cSFrederic Weisbecker 	}
1057fef20d9cSFrederic Weisbecker 
1058fef20d9cSFrederic Weisbecker 	/* get field width */
1059fef20d9cSFrederic Weisbecker 	spec->field_width = -1;
1060fef20d9cSFrederic Weisbecker 
1061fef20d9cSFrederic Weisbecker 	if (isdigit(*fmt))
1062fef20d9cSFrederic Weisbecker 		spec->field_width = skip_atoi(&fmt);
1063fef20d9cSFrederic Weisbecker 	else if (*fmt == '*') {
1064fef20d9cSFrederic Weisbecker 		/* it's the next argument */
1065ed681a91SVegard Nossum 		spec->type = FORMAT_TYPE_WIDTH;
1066fef20d9cSFrederic Weisbecker 		return ++fmt - start;
1067fef20d9cSFrederic Weisbecker 	}
1068fef20d9cSFrederic Weisbecker 
1069fef20d9cSFrederic Weisbecker precision:
1070fef20d9cSFrederic Weisbecker 	/* get the precision */
1071fef20d9cSFrederic Weisbecker 	spec->precision = -1;
1072fef20d9cSFrederic Weisbecker 	if (*fmt == '.') {
1073fef20d9cSFrederic Weisbecker 		++fmt;
1074fef20d9cSFrederic Weisbecker 		if (isdigit(*fmt)) {
1075fef20d9cSFrederic Weisbecker 			spec->precision = skip_atoi(&fmt);
1076fef20d9cSFrederic Weisbecker 			if (spec->precision < 0)
1077fef20d9cSFrederic Weisbecker 				spec->precision = 0;
1078fef20d9cSFrederic Weisbecker 		} else if (*fmt == '*') {
1079fef20d9cSFrederic Weisbecker 			/* it's the next argument */
1080adf26f84SVegard Nossum 			spec->type = FORMAT_TYPE_PRECISION;
1081fef20d9cSFrederic Weisbecker 			return ++fmt - start;
1082fef20d9cSFrederic Weisbecker 		}
1083fef20d9cSFrederic Weisbecker 	}
1084fef20d9cSFrederic Weisbecker 
1085fef20d9cSFrederic Weisbecker qualifier:
1086fef20d9cSFrederic Weisbecker 	/* get the conversion qualifier */
1087fef20d9cSFrederic Weisbecker 	spec->qualifier = -1;
108808562cb2SAndré Goddard Rosa 	if (*fmt == 'h' || TOLOWER(*fmt) == 'l' ||
108908562cb2SAndré Goddard Rosa 	    TOLOWER(*fmt) == 'z' || *fmt == 't') {
1090a4e94ef0SZhaolei 		spec->qualifier = *fmt++;
1091a4e94ef0SZhaolei 		if (unlikely(spec->qualifier == *fmt)) {
1092a4e94ef0SZhaolei 			if (spec->qualifier == 'l') {
1093fef20d9cSFrederic Weisbecker 				spec->qualifier = 'L';
1094fef20d9cSFrederic Weisbecker 				++fmt;
1095a4e94ef0SZhaolei 			} else if (spec->qualifier == 'h') {
1096a4e94ef0SZhaolei 				spec->qualifier = 'H';
1097a4e94ef0SZhaolei 				++fmt;
1098a4e94ef0SZhaolei 			}
1099fef20d9cSFrederic Weisbecker 		}
1100fef20d9cSFrederic Weisbecker 	}
1101fef20d9cSFrederic Weisbecker 
1102fef20d9cSFrederic Weisbecker 	/* default base */
1103fef20d9cSFrederic Weisbecker 	spec->base = 10;
1104fef20d9cSFrederic Weisbecker 	switch (*fmt) {
1105fef20d9cSFrederic Weisbecker 	case 'c':
1106fef20d9cSFrederic Weisbecker 		spec->type = FORMAT_TYPE_CHAR;
1107fef20d9cSFrederic Weisbecker 		return ++fmt - start;
1108fef20d9cSFrederic Weisbecker 
1109fef20d9cSFrederic Weisbecker 	case 's':
1110fef20d9cSFrederic Weisbecker 		spec->type = FORMAT_TYPE_STR;
1111fef20d9cSFrederic Weisbecker 		return ++fmt - start;
1112fef20d9cSFrederic Weisbecker 
1113fef20d9cSFrederic Weisbecker 	case 'p':
1114fef20d9cSFrederic Weisbecker 		spec->type = FORMAT_TYPE_PTR;
1115fef20d9cSFrederic Weisbecker 		return fmt - start;
1116fef20d9cSFrederic Weisbecker 		/* skip alnum */
1117fef20d9cSFrederic Weisbecker 
1118fef20d9cSFrederic Weisbecker 	case 'n':
1119fef20d9cSFrederic Weisbecker 		spec->type = FORMAT_TYPE_NRCHARS;
1120fef20d9cSFrederic Weisbecker 		return ++fmt - start;
1121fef20d9cSFrederic Weisbecker 
1122fef20d9cSFrederic Weisbecker 	case '%':
1123fef20d9cSFrederic Weisbecker 		spec->type = FORMAT_TYPE_PERCENT_CHAR;
1124fef20d9cSFrederic Weisbecker 		return ++fmt - start;
1125fef20d9cSFrederic Weisbecker 
1126fef20d9cSFrederic Weisbecker 	/* integer number formats - set up the flags and "break" */
1127fef20d9cSFrederic Weisbecker 	case 'o':
1128fef20d9cSFrederic Weisbecker 		spec->base = 8;
1129fef20d9cSFrederic Weisbecker 		break;
1130fef20d9cSFrederic Weisbecker 
1131fef20d9cSFrederic Weisbecker 	case 'x':
1132fef20d9cSFrederic Weisbecker 		spec->flags |= SMALL;
1133fef20d9cSFrederic Weisbecker 
1134fef20d9cSFrederic Weisbecker 	case 'X':
1135fef20d9cSFrederic Weisbecker 		spec->base = 16;
1136fef20d9cSFrederic Weisbecker 		break;
1137fef20d9cSFrederic Weisbecker 
1138fef20d9cSFrederic Weisbecker 	case 'd':
1139fef20d9cSFrederic Weisbecker 	case 'i':
114039e874f8SFrederic Weisbecker 		spec->flags |= SIGN;
1141fef20d9cSFrederic Weisbecker 	case 'u':
1142fef20d9cSFrederic Weisbecker 		break;
1143fef20d9cSFrederic Weisbecker 
1144fef20d9cSFrederic Weisbecker 	default:
1145fef20d9cSFrederic Weisbecker 		spec->type = FORMAT_TYPE_INVALID;
1146fef20d9cSFrederic Weisbecker 		return fmt - start;
1147fef20d9cSFrederic Weisbecker 	}
1148fef20d9cSFrederic Weisbecker 
1149fef20d9cSFrederic Weisbecker 	if (spec->qualifier == 'L')
1150fef20d9cSFrederic Weisbecker 		spec->type = FORMAT_TYPE_LONG_LONG;
1151fef20d9cSFrederic Weisbecker 	else if (spec->qualifier == 'l') {
115239e874f8SFrederic Weisbecker 		if (spec->flags & SIGN)
1153fef20d9cSFrederic Weisbecker 			spec->type = FORMAT_TYPE_LONG;
1154fef20d9cSFrederic Weisbecker 		else
1155fef20d9cSFrederic Weisbecker 			spec->type = FORMAT_TYPE_ULONG;
115608562cb2SAndré Goddard Rosa 	} else if (TOLOWER(spec->qualifier) == 'z') {
1157fef20d9cSFrederic Weisbecker 		spec->type = FORMAT_TYPE_SIZE_T;
1158fef20d9cSFrederic Weisbecker 	} else if (spec->qualifier == 't') {
1159fef20d9cSFrederic Weisbecker 		spec->type = FORMAT_TYPE_PTRDIFF;
1160a4e94ef0SZhaolei 	} else if (spec->qualifier == 'H') {
1161a4e94ef0SZhaolei 		if (spec->flags & SIGN)
1162a4e94ef0SZhaolei 			spec->type = FORMAT_TYPE_BYTE;
1163a4e94ef0SZhaolei 		else
1164a4e94ef0SZhaolei 			spec->type = FORMAT_TYPE_UBYTE;
1165fef20d9cSFrederic Weisbecker 	} else if (spec->qualifier == 'h') {
116639e874f8SFrederic Weisbecker 		if (spec->flags & SIGN)
1167fef20d9cSFrederic Weisbecker 			spec->type = FORMAT_TYPE_SHORT;
1168fef20d9cSFrederic Weisbecker 		else
1169fef20d9cSFrederic Weisbecker 			spec->type = FORMAT_TYPE_USHORT;
1170fef20d9cSFrederic Weisbecker 	} else {
117139e874f8SFrederic Weisbecker 		if (spec->flags & SIGN)
1172fef20d9cSFrederic Weisbecker 			spec->type = FORMAT_TYPE_INT;
1173fef20d9cSFrederic Weisbecker 		else
1174fef20d9cSFrederic Weisbecker 			spec->type = FORMAT_TYPE_UINT;
1175fef20d9cSFrederic Weisbecker 	}
1176fef20d9cSFrederic Weisbecker 
1177fef20d9cSFrederic Weisbecker 	return ++fmt - start;
117878a8bf69SLinus Torvalds }
117978a8bf69SLinus Torvalds 
11801da177e4SLinus Torvalds /**
11811da177e4SLinus Torvalds  * vsnprintf - Format a string and place it in a buffer
11821da177e4SLinus Torvalds  * @buf: The buffer to place the result into
11831da177e4SLinus Torvalds  * @size: The size of the buffer, including the trailing null space
11841da177e4SLinus Torvalds  * @fmt: The format string to use
11851da177e4SLinus Torvalds  * @args: Arguments for the format string
11861da177e4SLinus Torvalds  *
118720036fdcSAndi Kleen  * This function follows C99 vsnprintf, but has some extensions:
118891adcd2cSSteven Rostedt  * %pS output the name of a text symbol with offset
118991adcd2cSSteven Rostedt  * %ps output the name of a text symbol without offset
11900c8b946eSFrederic Weisbecker  * %pF output the name of a function pointer with its offset
11910c8b946eSFrederic Weisbecker  * %pf output the name of a function pointer without its offset
11928a79503aSUwe Kleine-König  * %pR output the address range in a struct resource with decoded flags
11938a79503aSUwe Kleine-König  * %pr output the address range in a struct resource with raw flags
11948a79503aSUwe Kleine-König  * %pM output a 6-byte MAC address with colons
11958a79503aSUwe Kleine-König  * %pm output a 6-byte MAC address without colons
11968a79503aSUwe Kleine-König  * %pI4 print an IPv4 address without leading zeros
11978a79503aSUwe Kleine-König  * %pi4 print an IPv4 address with leading zeros
11988a79503aSUwe Kleine-König  * %pI6 print an IPv6 address with colons
11998a79503aSUwe Kleine-König  * %pi6 print an IPv6 address without colons
12008a79503aSUwe Kleine-König  * %pI6c print an IPv6 address as specified by
12018a79503aSUwe Kleine-König  *   http://www.ietf.org/id/draft-kawamura-ipv6-text-representation-03.txt
12028a79503aSUwe Kleine-König  * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
12038a79503aSUwe Kleine-König  *   case.
12040efb4d20SSteven Rostedt  * %n is ignored
120520036fdcSAndi Kleen  *
12061da177e4SLinus Torvalds  * The return value is the number of characters which would
12071da177e4SLinus Torvalds  * be generated for the given input, excluding the trailing
12081da177e4SLinus Torvalds  * '\0', as per ISO C99. If you want to have the exact
12091da177e4SLinus Torvalds  * number of characters written into @buf as return value
121072fd4a35SRobert P. J. Day  * (not including the trailing '\0'), use vscnprintf(). If the
12111da177e4SLinus Torvalds  * return is greater than or equal to @size, the resulting
12121da177e4SLinus Torvalds  * string is truncated.
12131da177e4SLinus Torvalds  *
12141da177e4SLinus Torvalds  * Call this function if you are already dealing with a va_list.
121572fd4a35SRobert P. J. Day  * You probably want snprintf() instead.
12161da177e4SLinus Torvalds  */
12171da177e4SLinus Torvalds int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
12181da177e4SLinus Torvalds {
12191da177e4SLinus Torvalds 	unsigned long long num;
1220d4be151bSAndré Goddard Rosa 	char *str, *end;
1221fef20d9cSFrederic Weisbecker 	struct printf_spec spec = {0};
12221da177e4SLinus Torvalds 
1223f796937aSJeremy Fitzhardinge 	/* Reject out-of-range values early.  Large positive sizes are
1224f796937aSJeremy Fitzhardinge 	   used for unknown buffer sizes. */
12252f30b1f9SMarcin Slusarz 	if (WARN_ON_ONCE((int) size < 0))
12261da177e4SLinus Torvalds 		return 0;
12271da177e4SLinus Torvalds 
12281da177e4SLinus Torvalds 	str = buf;
1229f796937aSJeremy Fitzhardinge 	end = buf + size;
12301da177e4SLinus Torvalds 
1231f796937aSJeremy Fitzhardinge 	/* Make sure end is always >= buf */
1232f796937aSJeremy Fitzhardinge 	if (end < buf) {
12331da177e4SLinus Torvalds 		end = ((void *)-1);
1234f796937aSJeremy Fitzhardinge 		size = end - buf;
12351da177e4SLinus Torvalds 	}
12361da177e4SLinus Torvalds 
1237fef20d9cSFrederic Weisbecker 	while (*fmt) {
1238fef20d9cSFrederic Weisbecker 		const char *old_fmt = fmt;
1239d4be151bSAndré Goddard Rosa 		int read = format_decode(fmt, &spec);
1240fef20d9cSFrederic Weisbecker 
1241fef20d9cSFrederic Weisbecker 		fmt += read;
1242fef20d9cSFrederic Weisbecker 
1243fef20d9cSFrederic Weisbecker 		switch (spec.type) {
1244fef20d9cSFrederic Weisbecker 		case FORMAT_TYPE_NONE: {
1245fef20d9cSFrederic Weisbecker 			int copy = read;
1246fef20d9cSFrederic Weisbecker 			if (str < end) {
1247fef20d9cSFrederic Weisbecker 				if (copy > end - str)
1248fef20d9cSFrederic Weisbecker 					copy = end - str;
1249fef20d9cSFrederic Weisbecker 				memcpy(str, old_fmt, copy);
1250fef20d9cSFrederic Weisbecker 			}
1251fef20d9cSFrederic Weisbecker 			str += read;
1252fef20d9cSFrederic Weisbecker 			break;
12531da177e4SLinus Torvalds 		}
12541da177e4SLinus Torvalds 
1255ed681a91SVegard Nossum 		case FORMAT_TYPE_WIDTH:
1256fef20d9cSFrederic Weisbecker 			spec.field_width = va_arg(args, int);
1257fef20d9cSFrederic Weisbecker 			break;
12581da177e4SLinus Torvalds 
1259fef20d9cSFrederic Weisbecker 		case FORMAT_TYPE_PRECISION:
1260fef20d9cSFrederic Weisbecker 			spec.precision = va_arg(args, int);
1261fef20d9cSFrederic Weisbecker 			break;
12621da177e4SLinus Torvalds 
1263d4be151bSAndré Goddard Rosa 		case FORMAT_TYPE_CHAR: {
1264d4be151bSAndré Goddard Rosa 			char c;
1265d4be151bSAndré Goddard Rosa 
1266fef20d9cSFrederic Weisbecker 			if (!(spec.flags & LEFT)) {
1267fef20d9cSFrederic Weisbecker 				while (--spec.field_width > 0) {
1268f796937aSJeremy Fitzhardinge 					if (str < end)
12691da177e4SLinus Torvalds 						*str = ' ';
12701da177e4SLinus Torvalds 					++str;
1271fef20d9cSFrederic Weisbecker 
12721da177e4SLinus Torvalds 				}
12731da177e4SLinus Torvalds 			}
12741da177e4SLinus Torvalds 			c = (unsigned char) va_arg(args, int);
1275f796937aSJeremy Fitzhardinge 			if (str < end)
12761da177e4SLinus Torvalds 				*str = c;
12771da177e4SLinus Torvalds 			++str;
1278fef20d9cSFrederic Weisbecker 			while (--spec.field_width > 0) {
1279f796937aSJeremy Fitzhardinge 				if (str < end)
12801da177e4SLinus Torvalds 					*str = ' ';
12811da177e4SLinus Torvalds 				++str;
12821da177e4SLinus Torvalds 			}
1283fef20d9cSFrederic Weisbecker 			break;
1284d4be151bSAndré Goddard Rosa 		}
12851da177e4SLinus Torvalds 
1286fef20d9cSFrederic Weisbecker 		case FORMAT_TYPE_STR:
1287fef20d9cSFrederic Weisbecker 			str = string(str, end, va_arg(args, char *), spec);
1288fef20d9cSFrederic Weisbecker 			break;
12891da177e4SLinus Torvalds 
1290fef20d9cSFrederic Weisbecker 		case FORMAT_TYPE_PTR:
1291fef20d9cSFrederic Weisbecker 			str = pointer(fmt+1, str, end, va_arg(args, void *),
1292fef20d9cSFrederic Weisbecker 				      spec);
1293fef20d9cSFrederic Weisbecker 			while (isalnum(*fmt))
12944d8a743cSLinus Torvalds 				fmt++;
1295fef20d9cSFrederic Weisbecker 			break;
12961da177e4SLinus Torvalds 
1297fef20d9cSFrederic Weisbecker 		case FORMAT_TYPE_PERCENT_CHAR:
1298f796937aSJeremy Fitzhardinge 			if (str < end)
12991da177e4SLinus Torvalds 				*str = '%';
13001da177e4SLinus Torvalds 			++str;
13011da177e4SLinus Torvalds 			break;
13021da177e4SLinus Torvalds 
1303fef20d9cSFrederic Weisbecker 		case FORMAT_TYPE_INVALID:
1304f796937aSJeremy Fitzhardinge 			if (str < end)
13051da177e4SLinus Torvalds 				*str = '%';
13061da177e4SLinus Torvalds 			++str;
1307fef20d9cSFrederic Weisbecker 			break;
1308fef20d9cSFrederic Weisbecker 
1309fef20d9cSFrederic Weisbecker 		case FORMAT_TYPE_NRCHARS: {
1310fef20d9cSFrederic Weisbecker 			int qualifier = spec.qualifier;
1311fef20d9cSFrederic Weisbecker 
1312fef20d9cSFrederic Weisbecker 			if (qualifier == 'l') {
1313fef20d9cSFrederic Weisbecker 				long *ip = va_arg(args, long *);
1314fef20d9cSFrederic Weisbecker 				*ip = (str - buf);
131508562cb2SAndré Goddard Rosa 			} else if (TOLOWER(qualifier) == 'z') {
1316fef20d9cSFrederic Weisbecker 				size_t *ip = va_arg(args, size_t *);
1317fef20d9cSFrederic Weisbecker 				*ip = (str - buf);
13181da177e4SLinus Torvalds 			} else {
1319fef20d9cSFrederic Weisbecker 				int *ip = va_arg(args, int *);
1320fef20d9cSFrederic Weisbecker 				*ip = (str - buf);
1321fef20d9cSFrederic Weisbecker 			}
1322fef20d9cSFrederic Weisbecker 			break;
1323fef20d9cSFrederic Weisbecker 		}
1324fef20d9cSFrederic Weisbecker 
1325fef20d9cSFrederic Weisbecker 		default:
1326fef20d9cSFrederic Weisbecker 			switch (spec.type) {
1327fef20d9cSFrederic Weisbecker 			case FORMAT_TYPE_LONG_LONG:
1328fef20d9cSFrederic Weisbecker 				num = va_arg(args, long long);
1329fef20d9cSFrederic Weisbecker 				break;
1330fef20d9cSFrederic Weisbecker 			case FORMAT_TYPE_ULONG:
1331fef20d9cSFrederic Weisbecker 				num = va_arg(args, unsigned long);
1332fef20d9cSFrederic Weisbecker 				break;
1333fef20d9cSFrederic Weisbecker 			case FORMAT_TYPE_LONG:
1334fef20d9cSFrederic Weisbecker 				num = va_arg(args, long);
1335fef20d9cSFrederic Weisbecker 				break;
1336fef20d9cSFrederic Weisbecker 			case FORMAT_TYPE_SIZE_T:
1337fef20d9cSFrederic Weisbecker 				num = va_arg(args, size_t);
1338fef20d9cSFrederic Weisbecker 				break;
1339fef20d9cSFrederic Weisbecker 			case FORMAT_TYPE_PTRDIFF:
1340fef20d9cSFrederic Weisbecker 				num = va_arg(args, ptrdiff_t);
1341fef20d9cSFrederic Weisbecker 				break;
1342a4e94ef0SZhaolei 			case FORMAT_TYPE_UBYTE:
1343a4e94ef0SZhaolei 				num = (unsigned char) va_arg(args, int);
1344a4e94ef0SZhaolei 				break;
1345a4e94ef0SZhaolei 			case FORMAT_TYPE_BYTE:
1346a4e94ef0SZhaolei 				num = (signed char) va_arg(args, int);
1347a4e94ef0SZhaolei 				break;
1348fef20d9cSFrederic Weisbecker 			case FORMAT_TYPE_USHORT:
1349fef20d9cSFrederic Weisbecker 				num = (unsigned short) va_arg(args, int);
1350fef20d9cSFrederic Weisbecker 				break;
1351fef20d9cSFrederic Weisbecker 			case FORMAT_TYPE_SHORT:
1352fef20d9cSFrederic Weisbecker 				num = (short) va_arg(args, int);
1353fef20d9cSFrederic Weisbecker 				break;
135439e874f8SFrederic Weisbecker 			case FORMAT_TYPE_INT:
135539e874f8SFrederic Weisbecker 				num = (int) va_arg(args, int);
1356fef20d9cSFrederic Weisbecker 				break;
1357fef20d9cSFrederic Weisbecker 			default:
1358fef20d9cSFrederic Weisbecker 				num = va_arg(args, unsigned int);
13591da177e4SLinus Torvalds 			}
1360fef20d9cSFrederic Weisbecker 
1361fef20d9cSFrederic Weisbecker 			str = number(str, end, num, spec);
13621da177e4SLinus Torvalds 		}
1363fef20d9cSFrederic Weisbecker 	}
1364fef20d9cSFrederic Weisbecker 
1365f796937aSJeremy Fitzhardinge 	if (size > 0) {
1366f796937aSJeremy Fitzhardinge 		if (str < end)
13671da177e4SLinus Torvalds 			*str = '\0';
1368f796937aSJeremy Fitzhardinge 		else
13690a6047eeSLinus Torvalds 			end[-1] = '\0';
1370f796937aSJeremy Fitzhardinge 	}
1371fef20d9cSFrederic Weisbecker 
1372f796937aSJeremy Fitzhardinge 	/* the trailing null byte doesn't count towards the total */
13731da177e4SLinus Torvalds 	return str-buf;
1374fef20d9cSFrederic Weisbecker 
13751da177e4SLinus Torvalds }
13761da177e4SLinus Torvalds EXPORT_SYMBOL(vsnprintf);
13771da177e4SLinus Torvalds 
13781da177e4SLinus Torvalds /**
13791da177e4SLinus Torvalds  * vscnprintf - Format a string and place it in a buffer
13801da177e4SLinus Torvalds  * @buf: The buffer to place the result into
13811da177e4SLinus Torvalds  * @size: The size of the buffer, including the trailing null space
13821da177e4SLinus Torvalds  * @fmt: The format string to use
13831da177e4SLinus Torvalds  * @args: Arguments for the format string
13841da177e4SLinus Torvalds  *
13851da177e4SLinus Torvalds  * The return value is the number of characters which have been written into
13861da177e4SLinus Torvalds  * the @buf not including the trailing '\0'. If @size is <= 0 the function
13871da177e4SLinus Torvalds  * returns 0.
13881da177e4SLinus Torvalds  *
13891da177e4SLinus Torvalds  * Call this function if you are already dealing with a va_list.
139072fd4a35SRobert P. J. Day  * You probably want scnprintf() instead.
139120036fdcSAndi Kleen  *
139220036fdcSAndi Kleen  * See the vsnprintf() documentation for format string extensions over C99.
13931da177e4SLinus Torvalds  */
13941da177e4SLinus Torvalds int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
13951da177e4SLinus Torvalds {
13961da177e4SLinus Torvalds 	int i;
13971da177e4SLinus Torvalds 
13981da177e4SLinus Torvalds 	i = vsnprintf(buf, size, fmt, args);
13997b9186f5SAndré Goddard Rosa 
14001da177e4SLinus Torvalds 	return (i >= size) ? (size - 1) : i;
14011da177e4SLinus Torvalds }
14021da177e4SLinus Torvalds EXPORT_SYMBOL(vscnprintf);
14031da177e4SLinus Torvalds 
14041da177e4SLinus Torvalds /**
14051da177e4SLinus Torvalds  * snprintf - Format a string and place it in a buffer
14061da177e4SLinus Torvalds  * @buf: The buffer to place the result into
14071da177e4SLinus Torvalds  * @size: The size of the buffer, including the trailing null space
14081da177e4SLinus Torvalds  * @fmt: The format string to use
14091da177e4SLinus Torvalds  * @...: Arguments for the format string
14101da177e4SLinus Torvalds  *
14111da177e4SLinus Torvalds  * The return value is the number of characters which would be
14121da177e4SLinus Torvalds  * generated for the given input, excluding the trailing null,
14131da177e4SLinus Torvalds  * as per ISO C99.  If the return is greater than or equal to
14141da177e4SLinus Torvalds  * @size, the resulting string is truncated.
141520036fdcSAndi Kleen  *
141620036fdcSAndi Kleen  * See the vsnprintf() documentation for format string extensions over C99.
14171da177e4SLinus Torvalds  */
14181da177e4SLinus Torvalds int snprintf(char *buf, size_t size, const char *fmt, ...)
14191da177e4SLinus Torvalds {
14201da177e4SLinus Torvalds 	va_list args;
14211da177e4SLinus Torvalds 	int i;
14221da177e4SLinus Torvalds 
14231da177e4SLinus Torvalds 	va_start(args, fmt);
14241da177e4SLinus Torvalds 	i = vsnprintf(buf, size, fmt, args);
14251da177e4SLinus Torvalds 	va_end(args);
14267b9186f5SAndré Goddard Rosa 
14271da177e4SLinus Torvalds 	return i;
14281da177e4SLinus Torvalds }
14291da177e4SLinus Torvalds EXPORT_SYMBOL(snprintf);
14301da177e4SLinus Torvalds 
14311da177e4SLinus Torvalds /**
14321da177e4SLinus Torvalds  * scnprintf - Format a string and place it in a buffer
14331da177e4SLinus Torvalds  * @buf: The buffer to place the result into
14341da177e4SLinus Torvalds  * @size: The size of the buffer, including the trailing null space
14351da177e4SLinus Torvalds  * @fmt: The format string to use
14361da177e4SLinus Torvalds  * @...: Arguments for the format string
14371da177e4SLinus Torvalds  *
14381da177e4SLinus Torvalds  * The return value is the number of characters written into @buf not including
1439ea6f3281SMartin Peschke  * the trailing '\0'. If @size is <= 0 the function returns 0.
14401da177e4SLinus Torvalds  */
14411da177e4SLinus Torvalds 
14421da177e4SLinus Torvalds int scnprintf(char *buf, size_t size, const char *fmt, ...)
14431da177e4SLinus Torvalds {
14441da177e4SLinus Torvalds 	va_list args;
14451da177e4SLinus Torvalds 	int i;
14461da177e4SLinus Torvalds 
14471da177e4SLinus Torvalds 	va_start(args, fmt);
14481da177e4SLinus Torvalds 	i = vsnprintf(buf, size, fmt, args);
14491da177e4SLinus Torvalds 	va_end(args);
14507b9186f5SAndré Goddard Rosa 
14511da177e4SLinus Torvalds 	return (i >= size) ? (size - 1) : i;
14521da177e4SLinus Torvalds }
14531da177e4SLinus Torvalds EXPORT_SYMBOL(scnprintf);
14541da177e4SLinus Torvalds 
14551da177e4SLinus Torvalds /**
14561da177e4SLinus Torvalds  * vsprintf - Format a string and place it in a buffer
14571da177e4SLinus Torvalds  * @buf: The buffer to place the result into
14581da177e4SLinus Torvalds  * @fmt: The format string to use
14591da177e4SLinus Torvalds  * @args: Arguments for the format string
14601da177e4SLinus Torvalds  *
14611da177e4SLinus Torvalds  * The function returns the number of characters written
146272fd4a35SRobert P. J. Day  * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
14631da177e4SLinus Torvalds  * buffer overflows.
14641da177e4SLinus Torvalds  *
14651da177e4SLinus Torvalds  * Call this function if you are already dealing with a va_list.
146672fd4a35SRobert P. J. Day  * You probably want sprintf() instead.
146720036fdcSAndi Kleen  *
146820036fdcSAndi Kleen  * See the vsnprintf() documentation for format string extensions over C99.
14691da177e4SLinus Torvalds  */
14701da177e4SLinus Torvalds int vsprintf(char *buf, const char *fmt, va_list args)
14711da177e4SLinus Torvalds {
14721da177e4SLinus Torvalds 	return vsnprintf(buf, INT_MAX, fmt, args);
14731da177e4SLinus Torvalds }
14741da177e4SLinus Torvalds EXPORT_SYMBOL(vsprintf);
14751da177e4SLinus Torvalds 
14761da177e4SLinus Torvalds /**
14771da177e4SLinus Torvalds  * sprintf - Format a string and place it in a buffer
14781da177e4SLinus Torvalds  * @buf: The buffer to place the result into
14791da177e4SLinus Torvalds  * @fmt: The format string to use
14801da177e4SLinus Torvalds  * @...: Arguments for the format string
14811da177e4SLinus Torvalds  *
14821da177e4SLinus Torvalds  * The function returns the number of characters written
148372fd4a35SRobert P. J. Day  * into @buf. Use snprintf() or scnprintf() in order to avoid
14841da177e4SLinus Torvalds  * buffer overflows.
148520036fdcSAndi Kleen  *
148620036fdcSAndi Kleen  * See the vsnprintf() documentation for format string extensions over C99.
14871da177e4SLinus Torvalds  */
14881da177e4SLinus Torvalds int sprintf(char *buf, const char *fmt, ...)
14891da177e4SLinus Torvalds {
14901da177e4SLinus Torvalds 	va_list args;
14911da177e4SLinus Torvalds 	int i;
14921da177e4SLinus Torvalds 
14931da177e4SLinus Torvalds 	va_start(args, fmt);
14941da177e4SLinus Torvalds 	i = vsnprintf(buf, INT_MAX, fmt, args);
14951da177e4SLinus Torvalds 	va_end(args);
14967b9186f5SAndré Goddard Rosa 
14971da177e4SLinus Torvalds 	return i;
14981da177e4SLinus Torvalds }
14991da177e4SLinus Torvalds EXPORT_SYMBOL(sprintf);
15001da177e4SLinus Torvalds 
15014370aa4aSLai Jiangshan #ifdef CONFIG_BINARY_PRINTF
15024370aa4aSLai Jiangshan /*
15034370aa4aSLai Jiangshan  * bprintf service:
15044370aa4aSLai Jiangshan  * vbin_printf() - VA arguments to binary data
15054370aa4aSLai Jiangshan  * bstr_printf() - Binary data to text string
15064370aa4aSLai Jiangshan  */
15074370aa4aSLai Jiangshan 
15084370aa4aSLai Jiangshan /**
15094370aa4aSLai Jiangshan  * vbin_printf - Parse a format string and place args' binary value in a buffer
15104370aa4aSLai Jiangshan  * @bin_buf: The buffer to place args' binary value
15114370aa4aSLai Jiangshan  * @size: The size of the buffer(by words(32bits), not characters)
15124370aa4aSLai Jiangshan  * @fmt: The format string to use
15134370aa4aSLai Jiangshan  * @args: Arguments for the format string
15144370aa4aSLai Jiangshan  *
15154370aa4aSLai Jiangshan  * The format follows C99 vsnprintf, except %n is ignored, and its argument
15164370aa4aSLai Jiangshan  * is skiped.
15174370aa4aSLai Jiangshan  *
15184370aa4aSLai Jiangshan  * The return value is the number of words(32bits) which would be generated for
15194370aa4aSLai Jiangshan  * the given input.
15204370aa4aSLai Jiangshan  *
15214370aa4aSLai Jiangshan  * NOTE:
15224370aa4aSLai Jiangshan  * If the return value is greater than @size, the resulting bin_buf is NOT
15234370aa4aSLai Jiangshan  * valid for bstr_printf().
15244370aa4aSLai Jiangshan  */
15254370aa4aSLai Jiangshan int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
15264370aa4aSLai Jiangshan {
1527fef20d9cSFrederic Weisbecker 	struct printf_spec spec = {0};
15284370aa4aSLai Jiangshan 	char *str, *end;
15294370aa4aSLai Jiangshan 
15304370aa4aSLai Jiangshan 	str = (char *)bin_buf;
15314370aa4aSLai Jiangshan 	end = (char *)(bin_buf + size);
15324370aa4aSLai Jiangshan 
15334370aa4aSLai Jiangshan #define save_arg(type)							\
15344370aa4aSLai Jiangshan do {									\
15354370aa4aSLai Jiangshan 	if (sizeof(type) == 8) {					\
15364370aa4aSLai Jiangshan 		unsigned long long value;				\
15374370aa4aSLai Jiangshan 		str = PTR_ALIGN(str, sizeof(u32));			\
15384370aa4aSLai Jiangshan 		value = va_arg(args, unsigned long long);		\
15394370aa4aSLai Jiangshan 		if (str + sizeof(type) <= end) {			\
15404370aa4aSLai Jiangshan 			*(u32 *)str = *(u32 *)&value;			\
15414370aa4aSLai Jiangshan 			*(u32 *)(str + 4) = *((u32 *)&value + 1);	\
15424370aa4aSLai Jiangshan 		}							\
15434370aa4aSLai Jiangshan 	} else {							\
15444370aa4aSLai Jiangshan 		unsigned long value;					\
15454370aa4aSLai Jiangshan 		str = PTR_ALIGN(str, sizeof(type));			\
15464370aa4aSLai Jiangshan 		value = va_arg(args, int);				\
15474370aa4aSLai Jiangshan 		if (str + sizeof(type) <= end)				\
15484370aa4aSLai Jiangshan 			*(typeof(type) *)str = (type)value;		\
15494370aa4aSLai Jiangshan 	}								\
15504370aa4aSLai Jiangshan 	str += sizeof(type);						\
15514370aa4aSLai Jiangshan } while (0)
15524370aa4aSLai Jiangshan 
1553fef20d9cSFrederic Weisbecker 	while (*fmt) {
1554d4be151bSAndré Goddard Rosa 		int read = format_decode(fmt, &spec);
15554370aa4aSLai Jiangshan 
1556fef20d9cSFrederic Weisbecker 		fmt += read;
1557fef20d9cSFrederic Weisbecker 
1558fef20d9cSFrederic Weisbecker 		switch (spec.type) {
1559fef20d9cSFrederic Weisbecker 		case FORMAT_TYPE_NONE:
1560d4be151bSAndré Goddard Rosa 		case FORMAT_TYPE_INVALID:
1561d4be151bSAndré Goddard Rosa 		case FORMAT_TYPE_PERCENT_CHAR:
1562fef20d9cSFrederic Weisbecker 			break;
1563fef20d9cSFrederic Weisbecker 
1564ed681a91SVegard Nossum 		case FORMAT_TYPE_WIDTH:
1565fef20d9cSFrederic Weisbecker 		case FORMAT_TYPE_PRECISION:
15664370aa4aSLai Jiangshan 			save_arg(int);
1567fef20d9cSFrederic Weisbecker 			break;
15684370aa4aSLai Jiangshan 
1569fef20d9cSFrederic Weisbecker 		case FORMAT_TYPE_CHAR:
15704370aa4aSLai Jiangshan 			save_arg(char);
1571fef20d9cSFrederic Weisbecker 			break;
1572fef20d9cSFrederic Weisbecker 
1573fef20d9cSFrederic Weisbecker 		case FORMAT_TYPE_STR: {
15744370aa4aSLai Jiangshan 			const char *save_str = va_arg(args, char *);
15754370aa4aSLai Jiangshan 			size_t len;
15766c356634SAndré Goddard Rosa 
15774370aa4aSLai Jiangshan 			if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
15784370aa4aSLai Jiangshan 					|| (unsigned long)save_str < PAGE_SIZE)
15790f4f81dcSAndré Goddard Rosa 				save_str = "(null)";
15806c356634SAndré Goddard Rosa 			len = strlen(save_str) + 1;
15816c356634SAndré Goddard Rosa 			if (str + len < end)
15826c356634SAndré Goddard Rosa 				memcpy(str, save_str, len);
15836c356634SAndré Goddard Rosa 			str += len;
1584fef20d9cSFrederic Weisbecker 			break;
15854370aa4aSLai Jiangshan 		}
1586fef20d9cSFrederic Weisbecker 
1587fef20d9cSFrederic Weisbecker 		case FORMAT_TYPE_PTR:
15884370aa4aSLai Jiangshan 			save_arg(void *);
15894370aa4aSLai Jiangshan 			/* skip all alphanumeric pointer suffixes */
1590fef20d9cSFrederic Weisbecker 			while (isalnum(*fmt))
15914370aa4aSLai Jiangshan 				fmt++;
1592fef20d9cSFrederic Weisbecker 			break;
1593fef20d9cSFrederic Weisbecker 
1594fef20d9cSFrederic Weisbecker 		case FORMAT_TYPE_NRCHARS: {
15954370aa4aSLai Jiangshan 			/* skip %n 's argument */
1596fef20d9cSFrederic Weisbecker 			int qualifier = spec.qualifier;
15974370aa4aSLai Jiangshan 			void *skip_arg;
15984370aa4aSLai Jiangshan 			if (qualifier == 'l')
15994370aa4aSLai Jiangshan 				skip_arg = va_arg(args, long *);
160008562cb2SAndré Goddard Rosa 			else if (TOLOWER(qualifier) == 'z')
16014370aa4aSLai Jiangshan 				skip_arg = va_arg(args, size_t *);
16024370aa4aSLai Jiangshan 			else
16034370aa4aSLai Jiangshan 				skip_arg = va_arg(args, int *);
1604fef20d9cSFrederic Weisbecker 			break;
16054370aa4aSLai Jiangshan 		}
16064370aa4aSLai Jiangshan 
1607fef20d9cSFrederic Weisbecker 		default:
1608fef20d9cSFrederic Weisbecker 			switch (spec.type) {
1609fef20d9cSFrederic Weisbecker 
1610fef20d9cSFrederic Weisbecker 			case FORMAT_TYPE_LONG_LONG:
1611fef20d9cSFrederic Weisbecker 				save_arg(long long);
1612fef20d9cSFrederic Weisbecker 				break;
1613fef20d9cSFrederic Weisbecker 			case FORMAT_TYPE_ULONG:
1614fef20d9cSFrederic Weisbecker 			case FORMAT_TYPE_LONG:
1615fef20d9cSFrederic Weisbecker 				save_arg(unsigned long);
1616fef20d9cSFrederic Weisbecker 				break;
1617fef20d9cSFrederic Weisbecker 			case FORMAT_TYPE_SIZE_T:
1618fef20d9cSFrederic Weisbecker 				save_arg(size_t);
1619fef20d9cSFrederic Weisbecker 				break;
1620fef20d9cSFrederic Weisbecker 			case FORMAT_TYPE_PTRDIFF:
1621fef20d9cSFrederic Weisbecker 				save_arg(ptrdiff_t);
1622fef20d9cSFrederic Weisbecker 				break;
1623a4e94ef0SZhaolei 			case FORMAT_TYPE_UBYTE:
1624a4e94ef0SZhaolei 			case FORMAT_TYPE_BYTE:
1625a4e94ef0SZhaolei 				save_arg(char);
1626a4e94ef0SZhaolei 				break;
1627fef20d9cSFrederic Weisbecker 			case FORMAT_TYPE_USHORT:
1628fef20d9cSFrederic Weisbecker 			case FORMAT_TYPE_SHORT:
1629fef20d9cSFrederic Weisbecker 				save_arg(short);
1630fef20d9cSFrederic Weisbecker 				break;
1631fef20d9cSFrederic Weisbecker 			default:
1632fef20d9cSFrederic Weisbecker 				save_arg(int);
1633fef20d9cSFrederic Weisbecker 			}
1634fef20d9cSFrederic Weisbecker 		}
1635fef20d9cSFrederic Weisbecker 	}
1636fef20d9cSFrederic Weisbecker 
16377b9186f5SAndré Goddard Rosa 	return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
1638fef20d9cSFrederic Weisbecker #undef save_arg
16394370aa4aSLai Jiangshan }
16404370aa4aSLai Jiangshan EXPORT_SYMBOL_GPL(vbin_printf);
16414370aa4aSLai Jiangshan 
16424370aa4aSLai Jiangshan /**
16434370aa4aSLai Jiangshan  * bstr_printf - Format a string from binary arguments and place it in a buffer
16444370aa4aSLai Jiangshan  * @buf: The buffer to place the result into
16454370aa4aSLai Jiangshan  * @size: The size of the buffer, including the trailing null space
16464370aa4aSLai Jiangshan  * @fmt: The format string to use
16474370aa4aSLai Jiangshan  * @bin_buf: Binary arguments for the format string
16484370aa4aSLai Jiangshan  *
16494370aa4aSLai Jiangshan  * This function like C99 vsnprintf, but the difference is that vsnprintf gets
16504370aa4aSLai Jiangshan  * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
16514370aa4aSLai Jiangshan  * a binary buffer that generated by vbin_printf.
16524370aa4aSLai Jiangshan  *
16534370aa4aSLai Jiangshan  * The format follows C99 vsnprintf, but has some extensions:
16540efb4d20SSteven Rostedt  *  see vsnprintf comment for details.
16554370aa4aSLai Jiangshan  *
16564370aa4aSLai Jiangshan  * The return value is the number of characters which would
16574370aa4aSLai Jiangshan  * be generated for the given input, excluding the trailing
16584370aa4aSLai Jiangshan  * '\0', as per ISO C99. If you want to have the exact
16594370aa4aSLai Jiangshan  * number of characters written into @buf as return value
16604370aa4aSLai Jiangshan  * (not including the trailing '\0'), use vscnprintf(). If the
16614370aa4aSLai Jiangshan  * return is greater than or equal to @size, the resulting
16624370aa4aSLai Jiangshan  * string is truncated.
16634370aa4aSLai Jiangshan  */
16644370aa4aSLai Jiangshan int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
16654370aa4aSLai Jiangshan {
1666fef20d9cSFrederic Weisbecker 	struct printf_spec spec = {0};
1667d4be151bSAndré Goddard Rosa 	char *str, *end;
1668d4be151bSAndré Goddard Rosa 	const char *args = (const char *)bin_buf;
16694370aa4aSLai Jiangshan 
16702f30b1f9SMarcin Slusarz 	if (WARN_ON_ONCE((int) size < 0))
16714370aa4aSLai Jiangshan 		return 0;
16724370aa4aSLai Jiangshan 
16734370aa4aSLai Jiangshan 	str = buf;
16744370aa4aSLai Jiangshan 	end = buf + size;
16754370aa4aSLai Jiangshan 
16764370aa4aSLai Jiangshan #define get_arg(type)							\
16774370aa4aSLai Jiangshan ({									\
16784370aa4aSLai Jiangshan 	typeof(type) value;						\
16794370aa4aSLai Jiangshan 	if (sizeof(type) == 8) {					\
16804370aa4aSLai Jiangshan 		args = PTR_ALIGN(args, sizeof(u32));			\
16814370aa4aSLai Jiangshan 		*(u32 *)&value = *(u32 *)args;				\
16824370aa4aSLai Jiangshan 		*((u32 *)&value + 1) = *(u32 *)(args + 4);		\
16834370aa4aSLai Jiangshan 	} else {							\
16844370aa4aSLai Jiangshan 		args = PTR_ALIGN(args, sizeof(type));			\
16854370aa4aSLai Jiangshan 		value = *(typeof(type) *)args;				\
16864370aa4aSLai Jiangshan 	}								\
16874370aa4aSLai Jiangshan 	args += sizeof(type);						\
16884370aa4aSLai Jiangshan 	value;								\
16894370aa4aSLai Jiangshan })
16904370aa4aSLai Jiangshan 
16914370aa4aSLai Jiangshan 	/* Make sure end is always >= buf */
16924370aa4aSLai Jiangshan 	if (end < buf) {
16934370aa4aSLai Jiangshan 		end = ((void *)-1);
16944370aa4aSLai Jiangshan 		size = end - buf;
16954370aa4aSLai Jiangshan 	}
16964370aa4aSLai Jiangshan 
1697fef20d9cSFrederic Weisbecker 	while (*fmt) {
1698fef20d9cSFrederic Weisbecker 		const char *old_fmt = fmt;
1699d4be151bSAndré Goddard Rosa 		int read = format_decode(fmt, &spec);
1700fef20d9cSFrederic Weisbecker 
1701fef20d9cSFrederic Weisbecker 		fmt += read;
1702fef20d9cSFrederic Weisbecker 
1703fef20d9cSFrederic Weisbecker 		switch (spec.type) {
1704fef20d9cSFrederic Weisbecker 		case FORMAT_TYPE_NONE: {
1705fef20d9cSFrederic Weisbecker 			int copy = read;
1706fef20d9cSFrederic Weisbecker 			if (str < end) {
1707fef20d9cSFrederic Weisbecker 				if (copy > end - str)
1708fef20d9cSFrederic Weisbecker 					copy = end - str;
1709fef20d9cSFrederic Weisbecker 				memcpy(str, old_fmt, copy);
1710fef20d9cSFrederic Weisbecker 			}
1711fef20d9cSFrederic Weisbecker 			str += read;
1712fef20d9cSFrederic Weisbecker 			break;
17134370aa4aSLai Jiangshan 		}
17144370aa4aSLai Jiangshan 
1715ed681a91SVegard Nossum 		case FORMAT_TYPE_WIDTH:
1716fef20d9cSFrederic Weisbecker 			spec.field_width = get_arg(int);
1717fef20d9cSFrederic Weisbecker 			break;
17184370aa4aSLai Jiangshan 
1719fef20d9cSFrederic Weisbecker 		case FORMAT_TYPE_PRECISION:
1720fef20d9cSFrederic Weisbecker 			spec.precision = get_arg(int);
1721fef20d9cSFrederic Weisbecker 			break;
17224370aa4aSLai Jiangshan 
1723d4be151bSAndré Goddard Rosa 		case FORMAT_TYPE_CHAR: {
1724d4be151bSAndré Goddard Rosa 			char c;
1725d4be151bSAndré Goddard Rosa 
1726fef20d9cSFrederic Weisbecker 			if (!(spec.flags & LEFT)) {
1727fef20d9cSFrederic Weisbecker 				while (--spec.field_width > 0) {
17284370aa4aSLai Jiangshan 					if (str < end)
17294370aa4aSLai Jiangshan 						*str = ' ';
17304370aa4aSLai Jiangshan 					++str;
17314370aa4aSLai Jiangshan 				}
17324370aa4aSLai Jiangshan 			}
17334370aa4aSLai Jiangshan 			c = (unsigned char) get_arg(char);
17344370aa4aSLai Jiangshan 			if (str < end)
17354370aa4aSLai Jiangshan 				*str = c;
17364370aa4aSLai Jiangshan 			++str;
1737fef20d9cSFrederic Weisbecker 			while (--spec.field_width > 0) {
17384370aa4aSLai Jiangshan 				if (str < end)
17394370aa4aSLai Jiangshan 					*str = ' ';
17404370aa4aSLai Jiangshan 				++str;
17414370aa4aSLai Jiangshan 			}
1742fef20d9cSFrederic Weisbecker 			break;
1743d4be151bSAndré Goddard Rosa 		}
17444370aa4aSLai Jiangshan 
1745fef20d9cSFrederic Weisbecker 		case FORMAT_TYPE_STR: {
17464370aa4aSLai Jiangshan 			const char *str_arg = args;
1747d4be151bSAndré Goddard Rosa 			args += strlen(str_arg) + 1;
1748fef20d9cSFrederic Weisbecker 			str = string(str, end, (char *)str_arg, spec);
1749fef20d9cSFrederic Weisbecker 			break;
17504370aa4aSLai Jiangshan 		}
17514370aa4aSLai Jiangshan 
1752fef20d9cSFrederic Weisbecker 		case FORMAT_TYPE_PTR:
1753fef20d9cSFrederic Weisbecker 			str = pointer(fmt+1, str, end, get_arg(void *), spec);
1754fef20d9cSFrederic Weisbecker 			while (isalnum(*fmt))
17554370aa4aSLai Jiangshan 				fmt++;
1756fef20d9cSFrederic Weisbecker 			break;
17574370aa4aSLai Jiangshan 
1758fef20d9cSFrederic Weisbecker 		case FORMAT_TYPE_PERCENT_CHAR:
1759fef20d9cSFrederic Weisbecker 		case FORMAT_TYPE_INVALID:
17604370aa4aSLai Jiangshan 			if (str < end)
17614370aa4aSLai Jiangshan 				*str = '%';
17624370aa4aSLai Jiangshan 			++str;
1763fef20d9cSFrederic Weisbecker 			break;
1764fef20d9cSFrederic Weisbecker 
1765fef20d9cSFrederic Weisbecker 		case FORMAT_TYPE_NRCHARS:
1766fef20d9cSFrederic Weisbecker 			/* skip */
1767fef20d9cSFrederic Weisbecker 			break;
1768fef20d9cSFrederic Weisbecker 
1769d4be151bSAndré Goddard Rosa 		default: {
1770d4be151bSAndré Goddard Rosa 			unsigned long long num;
1771d4be151bSAndré Goddard Rosa 
1772fef20d9cSFrederic Weisbecker 			switch (spec.type) {
1773fef20d9cSFrederic Weisbecker 
1774fef20d9cSFrederic Weisbecker 			case FORMAT_TYPE_LONG_LONG:
17754370aa4aSLai Jiangshan 				num = get_arg(long long);
1776fef20d9cSFrederic Weisbecker 				break;
1777fef20d9cSFrederic Weisbecker 			case FORMAT_TYPE_ULONG:
1778fef20d9cSFrederic Weisbecker 			case FORMAT_TYPE_LONG:
1779fef20d9cSFrederic Weisbecker 				num = get_arg(unsigned long);
1780fef20d9cSFrederic Weisbecker 				break;
1781fef20d9cSFrederic Weisbecker 			case FORMAT_TYPE_SIZE_T:
17824370aa4aSLai Jiangshan 				num = get_arg(size_t);
1783fef20d9cSFrederic Weisbecker 				break;
1784fef20d9cSFrederic Weisbecker 			case FORMAT_TYPE_PTRDIFF:
17854370aa4aSLai Jiangshan 				num = get_arg(ptrdiff_t);
1786fef20d9cSFrederic Weisbecker 				break;
1787a4e94ef0SZhaolei 			case FORMAT_TYPE_UBYTE:
1788a4e94ef0SZhaolei 				num = get_arg(unsigned char);
1789a4e94ef0SZhaolei 				break;
1790a4e94ef0SZhaolei 			case FORMAT_TYPE_BYTE:
1791a4e94ef0SZhaolei 				num = get_arg(signed char);
1792a4e94ef0SZhaolei 				break;
1793fef20d9cSFrederic Weisbecker 			case FORMAT_TYPE_USHORT:
1794fef20d9cSFrederic Weisbecker 				num = get_arg(unsigned short);
1795fef20d9cSFrederic Weisbecker 				break;
1796fef20d9cSFrederic Weisbecker 			case FORMAT_TYPE_SHORT:
1797fef20d9cSFrederic Weisbecker 				num = get_arg(short);
1798fef20d9cSFrederic Weisbecker 				break;
1799fef20d9cSFrederic Weisbecker 			case FORMAT_TYPE_UINT:
18004370aa4aSLai Jiangshan 				num = get_arg(unsigned int);
1801fef20d9cSFrederic Weisbecker 				break;
1802fef20d9cSFrederic Weisbecker 			default:
1803fef20d9cSFrederic Weisbecker 				num = get_arg(int);
18044370aa4aSLai Jiangshan 			}
1805fef20d9cSFrederic Weisbecker 
1806fef20d9cSFrederic Weisbecker 			str = number(str, end, num, spec);
1807d4be151bSAndré Goddard Rosa 		} /* default: */
1808d4be151bSAndré Goddard Rosa 		} /* switch(spec.type) */
1809d4be151bSAndré Goddard Rosa 	} /* while(*fmt) */
1810fef20d9cSFrederic Weisbecker 
18114370aa4aSLai Jiangshan 	if (size > 0) {
18124370aa4aSLai Jiangshan 		if (str < end)
18134370aa4aSLai Jiangshan 			*str = '\0';
18144370aa4aSLai Jiangshan 		else
18154370aa4aSLai Jiangshan 			end[-1] = '\0';
18164370aa4aSLai Jiangshan 	}
1817fef20d9cSFrederic Weisbecker 
18184370aa4aSLai Jiangshan #undef get_arg
18194370aa4aSLai Jiangshan 
18204370aa4aSLai Jiangshan 	/* the trailing null byte doesn't count towards the total */
18214370aa4aSLai Jiangshan 	return str - buf;
18224370aa4aSLai Jiangshan }
18234370aa4aSLai Jiangshan EXPORT_SYMBOL_GPL(bstr_printf);
18244370aa4aSLai Jiangshan 
18254370aa4aSLai Jiangshan /**
18264370aa4aSLai Jiangshan  * bprintf - Parse a format string and place args' binary value in a buffer
18274370aa4aSLai Jiangshan  * @bin_buf: The buffer to place args' binary value
18284370aa4aSLai Jiangshan  * @size: The size of the buffer(by words(32bits), not characters)
18294370aa4aSLai Jiangshan  * @fmt: The format string to use
18304370aa4aSLai Jiangshan  * @...: Arguments for the format string
18314370aa4aSLai Jiangshan  *
18324370aa4aSLai Jiangshan  * The function returns the number of words(u32) written
18334370aa4aSLai Jiangshan  * into @bin_buf.
18344370aa4aSLai Jiangshan  */
18354370aa4aSLai Jiangshan int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
18364370aa4aSLai Jiangshan {
18374370aa4aSLai Jiangshan 	va_list args;
18384370aa4aSLai Jiangshan 	int ret;
18394370aa4aSLai Jiangshan 
18404370aa4aSLai Jiangshan 	va_start(args, fmt);
18414370aa4aSLai Jiangshan 	ret = vbin_printf(bin_buf, size, fmt, args);
18424370aa4aSLai Jiangshan 	va_end(args);
18437b9186f5SAndré Goddard Rosa 
18444370aa4aSLai Jiangshan 	return ret;
18454370aa4aSLai Jiangshan }
18464370aa4aSLai Jiangshan EXPORT_SYMBOL_GPL(bprintf);
18474370aa4aSLai Jiangshan 
18484370aa4aSLai Jiangshan #endif /* CONFIG_BINARY_PRINTF */
18494370aa4aSLai Jiangshan 
18501da177e4SLinus Torvalds /**
18511da177e4SLinus Torvalds  * vsscanf - Unformat a buffer into a list of arguments
18521da177e4SLinus Torvalds  * @buf:	input buffer
18531da177e4SLinus Torvalds  * @fmt:	format of buffer
18541da177e4SLinus Torvalds  * @args:	arguments
18551da177e4SLinus Torvalds  */
18561da177e4SLinus Torvalds int vsscanf(const char *buf, const char *fmt, va_list args)
18571da177e4SLinus Torvalds {
18581da177e4SLinus Torvalds 	const char *str = buf;
18591da177e4SLinus Torvalds 	char *next;
18601da177e4SLinus Torvalds 	char digit;
18611da177e4SLinus Torvalds 	int num = 0;
18627b9186f5SAndré Goddard Rosa 	int qualifier, base, field_width;
1863d4be151bSAndré Goddard Rosa 	bool is_sign;
18641da177e4SLinus Torvalds 
18651da177e4SLinus Torvalds 	while (*fmt && *str) {
18661da177e4SLinus Torvalds 		/* skip any white space in format */
18671da177e4SLinus Torvalds 		/* white space in format matchs any amount of
18681da177e4SLinus Torvalds 		 * white space, including none, in the input.
18691da177e4SLinus Torvalds 		 */
18701da177e4SLinus Torvalds 		if (isspace(*fmt)) {
1871e7d2860bSAndré Goddard Rosa 			fmt = skip_spaces(++fmt);
1872e7d2860bSAndré Goddard Rosa 			str = skip_spaces(str);
18731da177e4SLinus Torvalds 		}
18741da177e4SLinus Torvalds 
18751da177e4SLinus Torvalds 		/* anything that is not a conversion must match exactly */
18761da177e4SLinus Torvalds 		if (*fmt != '%' && *fmt) {
18771da177e4SLinus Torvalds 			if (*fmt++ != *str++)
18781da177e4SLinus Torvalds 				break;
18791da177e4SLinus Torvalds 			continue;
18801da177e4SLinus Torvalds 		}
18811da177e4SLinus Torvalds 
18821da177e4SLinus Torvalds 		if (!*fmt)
18831da177e4SLinus Torvalds 			break;
18841da177e4SLinus Torvalds 		++fmt;
18851da177e4SLinus Torvalds 
18861da177e4SLinus Torvalds 		/* skip this conversion.
18871da177e4SLinus Torvalds 		 * advance both strings to next white space
18881da177e4SLinus Torvalds 		 */
18891da177e4SLinus Torvalds 		if (*fmt == '*') {
18908fccae2cSAndy Spencer 			while (!isspace(*fmt) && *fmt != '%' && *fmt)
18911da177e4SLinus Torvalds 				fmt++;
18921da177e4SLinus Torvalds 			while (!isspace(*str) && *str)
18931da177e4SLinus Torvalds 				str++;
18941da177e4SLinus Torvalds 			continue;
18951da177e4SLinus Torvalds 		}
18961da177e4SLinus Torvalds 
18971da177e4SLinus Torvalds 		/* get field width */
18981da177e4SLinus Torvalds 		field_width = -1;
18991da177e4SLinus Torvalds 		if (isdigit(*fmt))
19001da177e4SLinus Torvalds 			field_width = skip_atoi(&fmt);
19011da177e4SLinus Torvalds 
19021da177e4SLinus Torvalds 		/* get conversion qualifier */
19031da177e4SLinus Torvalds 		qualifier = -1;
190408562cb2SAndré Goddard Rosa 		if (*fmt == 'h' || TOLOWER(*fmt) == 'l' ||
190508562cb2SAndré Goddard Rosa 		    TOLOWER(*fmt) == 'z') {
19061da177e4SLinus Torvalds 			qualifier = *fmt++;
19071da177e4SLinus Torvalds 			if (unlikely(qualifier == *fmt)) {
19081da177e4SLinus Torvalds 				if (qualifier == 'h') {
19091da177e4SLinus Torvalds 					qualifier = 'H';
19101da177e4SLinus Torvalds 					fmt++;
19111da177e4SLinus Torvalds 				} else if (qualifier == 'l') {
19121da177e4SLinus Torvalds 					qualifier = 'L';
19131da177e4SLinus Torvalds 					fmt++;
19141da177e4SLinus Torvalds 				}
19151da177e4SLinus Torvalds 			}
19161da177e4SLinus Torvalds 		}
19171da177e4SLinus Torvalds 
19181da177e4SLinus Torvalds 		if (!*fmt || !*str)
19191da177e4SLinus Torvalds 			break;
19201da177e4SLinus Torvalds 
1921d4be151bSAndré Goddard Rosa 		base = 10;
1922d4be151bSAndré Goddard Rosa 		is_sign = 0;
1923d4be151bSAndré Goddard Rosa 
19241da177e4SLinus Torvalds 		switch (*fmt++) {
19251da177e4SLinus Torvalds 		case 'c':
19261da177e4SLinus Torvalds 		{
19271da177e4SLinus Torvalds 			char *s = (char *)va_arg(args, char*);
19281da177e4SLinus Torvalds 			if (field_width == -1)
19291da177e4SLinus Torvalds 				field_width = 1;
19301da177e4SLinus Torvalds 			do {
19311da177e4SLinus Torvalds 				*s++ = *str++;
19321da177e4SLinus Torvalds 			} while (--field_width > 0 && *str);
19331da177e4SLinus Torvalds 			num++;
19341da177e4SLinus Torvalds 		}
19351da177e4SLinus Torvalds 		continue;
19361da177e4SLinus Torvalds 		case 's':
19371da177e4SLinus Torvalds 		{
19381da177e4SLinus Torvalds 			char *s = (char *)va_arg(args, char *);
19391da177e4SLinus Torvalds 			if (field_width == -1)
19401da177e4SLinus Torvalds 				field_width = INT_MAX;
19411da177e4SLinus Torvalds 			/* first, skip leading white space in buffer */
1942e7d2860bSAndré Goddard Rosa 			str = skip_spaces(str);
19431da177e4SLinus Torvalds 
19441da177e4SLinus Torvalds 			/* now copy until next white space */
19457b9186f5SAndré Goddard Rosa 			while (*str && !isspace(*str) && field_width--)
19461da177e4SLinus Torvalds 				*s++ = *str++;
19471da177e4SLinus Torvalds 			*s = '\0';
19481da177e4SLinus Torvalds 			num++;
19491da177e4SLinus Torvalds 		}
19501da177e4SLinus Torvalds 		continue;
19511da177e4SLinus Torvalds 		case 'n':
19521da177e4SLinus Torvalds 			/* return number of characters read so far */
19531da177e4SLinus Torvalds 		{
19541da177e4SLinus Torvalds 			int *i = (int *)va_arg(args, int*);
19551da177e4SLinus Torvalds 			*i = str - buf;
19561da177e4SLinus Torvalds 		}
19571da177e4SLinus Torvalds 		continue;
19581da177e4SLinus Torvalds 		case 'o':
19591da177e4SLinus Torvalds 			base = 8;
19601da177e4SLinus Torvalds 			break;
19611da177e4SLinus Torvalds 		case 'x':
19621da177e4SLinus Torvalds 		case 'X':
19631da177e4SLinus Torvalds 			base = 16;
19641da177e4SLinus Torvalds 			break;
19651da177e4SLinus Torvalds 		case 'i':
19661da177e4SLinus Torvalds 			base = 0;
19671da177e4SLinus Torvalds 		case 'd':
19681da177e4SLinus Torvalds 			is_sign = 1;
19691da177e4SLinus Torvalds 		case 'u':
19701da177e4SLinus Torvalds 			break;
19711da177e4SLinus Torvalds 		case '%':
19721da177e4SLinus Torvalds 			/* looking for '%' in str */
19731da177e4SLinus Torvalds 			if (*str++ != '%')
19741da177e4SLinus Torvalds 				return num;
19751da177e4SLinus Torvalds 			continue;
19761da177e4SLinus Torvalds 		default:
19771da177e4SLinus Torvalds 			/* invalid format; stop here */
19781da177e4SLinus Torvalds 			return num;
19791da177e4SLinus Torvalds 		}
19801da177e4SLinus Torvalds 
19811da177e4SLinus Torvalds 		/* have some sort of integer conversion.
19821da177e4SLinus Torvalds 		 * first, skip white space in buffer.
19831da177e4SLinus Torvalds 		 */
1984e7d2860bSAndré Goddard Rosa 		str = skip_spaces(str);
19851da177e4SLinus Torvalds 
19861da177e4SLinus Torvalds 		digit = *str;
19871da177e4SLinus Torvalds 		if (is_sign && digit == '-')
19881da177e4SLinus Torvalds 			digit = *(str + 1);
19891da177e4SLinus Torvalds 
19901da177e4SLinus Torvalds 		if (!digit
19911da177e4SLinus Torvalds 		    || (base == 16 && !isxdigit(digit))
19921da177e4SLinus Torvalds 		    || (base == 10 && !isdigit(digit))
19931da177e4SLinus Torvalds 		    || (base == 8 && (!isdigit(digit) || digit > '7'))
19941da177e4SLinus Torvalds 		    || (base == 0 && !isdigit(digit)))
19951da177e4SLinus Torvalds 			break;
19961da177e4SLinus Torvalds 
19971da177e4SLinus Torvalds 		switch (qualifier) {
19981da177e4SLinus Torvalds 		case 'H':	/* that's 'hh' in format */
19991da177e4SLinus Torvalds 			if (is_sign) {
20001da177e4SLinus Torvalds 				signed char *s = (signed char *)va_arg(args, signed char *);
20011da177e4SLinus Torvalds 				*s = (signed char)simple_strtol(str, &next, base);
20021da177e4SLinus Torvalds 			} else {
20031da177e4SLinus Torvalds 				unsigned char *s = (unsigned char *)va_arg(args, unsigned char *);
20041da177e4SLinus Torvalds 				*s = (unsigned char)simple_strtoul(str, &next, base);
20051da177e4SLinus Torvalds 			}
20061da177e4SLinus Torvalds 			break;
20071da177e4SLinus Torvalds 		case 'h':
20081da177e4SLinus Torvalds 			if (is_sign) {
20091da177e4SLinus Torvalds 				short *s = (short *)va_arg(args, short *);
20101da177e4SLinus Torvalds 				*s = (short)simple_strtol(str, &next, base);
20111da177e4SLinus Torvalds 			} else {
20121da177e4SLinus Torvalds 				unsigned short *s = (unsigned short *)va_arg(args, unsigned short *);
20131da177e4SLinus Torvalds 				*s = (unsigned short)simple_strtoul(str, &next, base);
20141da177e4SLinus Torvalds 			}
20151da177e4SLinus Torvalds 			break;
20161da177e4SLinus Torvalds 		case 'l':
20171da177e4SLinus Torvalds 			if (is_sign) {
20181da177e4SLinus Torvalds 				long *l = (long *)va_arg(args, long *);
20191da177e4SLinus Torvalds 				*l = simple_strtol(str, &next, base);
20201da177e4SLinus Torvalds 			} else {
20211da177e4SLinus Torvalds 				unsigned long *l = (unsigned long *)va_arg(args, unsigned long *);
20221da177e4SLinus Torvalds 				*l = simple_strtoul(str, &next, base);
20231da177e4SLinus Torvalds 			}
20241da177e4SLinus Torvalds 			break;
20251da177e4SLinus Torvalds 		case 'L':
20261da177e4SLinus Torvalds 			if (is_sign) {
20271da177e4SLinus Torvalds 				long long *l = (long long *)va_arg(args, long long *);
20281da177e4SLinus Torvalds 				*l = simple_strtoll(str, &next, base);
20291da177e4SLinus Torvalds 			} else {
20301da177e4SLinus Torvalds 				unsigned long long *l = (unsigned long long *)va_arg(args, unsigned long long *);
20311da177e4SLinus Torvalds 				*l = simple_strtoull(str, &next, base);
20321da177e4SLinus Torvalds 			}
20331da177e4SLinus Torvalds 			break;
20341da177e4SLinus Torvalds 		case 'Z':
20351da177e4SLinus Torvalds 		case 'z':
20361da177e4SLinus Torvalds 		{
20371da177e4SLinus Torvalds 			size_t *s = (size_t *)va_arg(args, size_t *);
20381da177e4SLinus Torvalds 			*s = (size_t)simple_strtoul(str, &next, base);
20391da177e4SLinus Torvalds 		}
20401da177e4SLinus Torvalds 		break;
20411da177e4SLinus Torvalds 		default:
20421da177e4SLinus Torvalds 			if (is_sign) {
20431da177e4SLinus Torvalds 				int *i = (int *)va_arg(args, int *);
20441da177e4SLinus Torvalds 				*i = (int)simple_strtol(str, &next, base);
20451da177e4SLinus Torvalds 			} else {
20461da177e4SLinus Torvalds 				unsigned int *i = (unsigned int *)va_arg(args, unsigned int*);
20471da177e4SLinus Torvalds 				*i = (unsigned int)simple_strtoul(str, &next, base);
20481da177e4SLinus Torvalds 			}
20491da177e4SLinus Torvalds 			break;
20501da177e4SLinus Torvalds 		}
20511da177e4SLinus Torvalds 		num++;
20521da177e4SLinus Torvalds 
20531da177e4SLinus Torvalds 		if (!next)
20541da177e4SLinus Torvalds 			break;
20551da177e4SLinus Torvalds 		str = next;
20561da177e4SLinus Torvalds 	}
2057c6b40d16SJohannes Berg 
2058c6b40d16SJohannes Berg 	/*
2059c6b40d16SJohannes Berg 	 * Now we've come all the way through so either the input string or the
2060c6b40d16SJohannes Berg 	 * format ended. In the former case, there can be a %n at the current
2061c6b40d16SJohannes Berg 	 * position in the format that needs to be filled.
2062c6b40d16SJohannes Berg 	 */
2063c6b40d16SJohannes Berg 	if (*fmt == '%' && *(fmt + 1) == 'n') {
2064c6b40d16SJohannes Berg 		int *p = (int *)va_arg(args, int *);
2065c6b40d16SJohannes Berg 		*p = str - buf;
2066c6b40d16SJohannes Berg 	}
2067c6b40d16SJohannes Berg 
20681da177e4SLinus Torvalds 	return num;
20691da177e4SLinus Torvalds }
20701da177e4SLinus Torvalds EXPORT_SYMBOL(vsscanf);
20711da177e4SLinus Torvalds 
20721da177e4SLinus Torvalds /**
20731da177e4SLinus Torvalds  * sscanf - Unformat a buffer into a list of arguments
20741da177e4SLinus Torvalds  * @buf:	input buffer
20751da177e4SLinus Torvalds  * @fmt:	formatting of buffer
20761da177e4SLinus Torvalds  * @...:	resulting arguments
20771da177e4SLinus Torvalds  */
20781da177e4SLinus Torvalds int sscanf(const char *buf, const char *fmt, ...)
20791da177e4SLinus Torvalds {
20801da177e4SLinus Torvalds 	va_list args;
20811da177e4SLinus Torvalds 	int i;
20821da177e4SLinus Torvalds 
20831da177e4SLinus Torvalds 	va_start(args, fmt);
20841da177e4SLinus Torvalds 	i = vsscanf(buf, fmt, args);
20851da177e4SLinus Torvalds 	va_end(args);
20867b9186f5SAndré Goddard Rosa 
20871da177e4SLinus Torvalds 	return i;
20881da177e4SLinus Torvalds }
20891da177e4SLinus Torvalds EXPORT_SYMBOL(sscanf);
2090