xref: /openbmc/u-boot/lib/vsprintf.c (revision 5794619e)
1 /*
2  *  linux/lib/vsprintf.c
3  *
4  *  Copyright (C) 1991, 1992  Linus Torvalds
5  */
6 
7 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
8 /*
9  * Wirzenius wrote this portably, Torvalds fucked it up :-)
10  */
11 
12 #include <stdarg.h>
13 #include <linux/types.h>
14 #include <linux/string.h>
15 #include <linux/ctype.h>
16 
17 #include <common.h>
18 #if !defined (CONFIG_PANIC_HANG)
19 #include <command.h>
20 /*cmd_boot.c*/
21 extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
22 #endif
23 
24 #include <div64.h>
25 # define NUM_TYPE long long
26 #define noinline __attribute__((noinline))
27 
28 const char hex_asc[] = "0123456789abcdef";
29 #define hex_asc_lo(x)   hex_asc[((x) & 0x0f)]
30 #define hex_asc_hi(x)   hex_asc[((x) & 0xf0) >> 4]
31 
32 static inline char *pack_hex_byte(char *buf, u8 byte)
33 {
34 	*buf++ = hex_asc_hi(byte);
35 	*buf++ = hex_asc_lo(byte);
36 	return buf;
37 }
38 
39 unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base)
40 {
41 	unsigned long result = 0,value;
42 
43 	if (*cp == '0') {
44 		cp++;
45 		if ((*cp == 'x') && isxdigit(cp[1])) {
46 			base = 16;
47 			cp++;
48 		}
49 		if (!base) {
50 			base = 8;
51 		}
52 	}
53 	if (!base) {
54 		base = 10;
55 	}
56 	while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
57 	    ? toupper(*cp) : *cp)-'A'+10) < base) {
58 		result = result*base + value;
59 		cp++;
60 	}
61 	if (endp)
62 		*endp = (char *)cp;
63 	return result;
64 }
65 
66 long simple_strtol(const char *cp,char **endp,unsigned int base)
67 {
68 	if(*cp=='-')
69 		return -simple_strtoul(cp+1,endp,base);
70 	return simple_strtoul(cp,endp,base);
71 }
72 
73 int ustrtoul(const char *cp, char **endp, unsigned int base)
74 {
75 	unsigned long result = simple_strtoul(cp, endp, base);
76 	switch (**endp) {
77 	case 'G' :
78 		result *= 1024;
79 		/* fall through */
80 	case 'M':
81 		result *= 1024;
82 		/* fall through */
83 	case 'K':
84 	case 'k':
85 		result *= 1024;
86 		if ((*endp)[1] == 'i') {
87 			if ((*endp)[2] == 'B')
88 				(*endp) += 3;
89 			else
90 				(*endp) += 2;
91 		}
92 	}
93 	return result;
94 }
95 
96 unsigned long long simple_strtoull (const char *cp, char **endp, unsigned int base)
97 {
98 	unsigned long long result = 0, value;
99 
100 	if (*cp == '0') {
101 		cp++;
102 		if ((*cp == 'x') && isxdigit (cp[1])) {
103 			base = 16;
104 			cp++;
105 		}
106 		if (!base) {
107 			base = 8;
108 		}
109 	}
110 	if (!base) {
111 		base = 10;
112 	}
113 	while (isxdigit (*cp) && (value = isdigit (*cp)
114 				? *cp - '0'
115 				: (islower (*cp) ? toupper (*cp) : *cp) - 'A' + 10) < base) {
116 		result = result * base + value;
117 		cp++;
118 	}
119 	if (endp)
120 		*endp = (char *) cp;
121 	return result;
122 }
123 
124 /* we use this so that we can do without the ctype library */
125 #define is_digit(c)	((c) >= '0' && (c) <= '9')
126 
127 static int skip_atoi(const char **s)
128 {
129 	int i=0;
130 
131 	while (is_digit(**s))
132 		i = i*10 + *((*s)++) - '0';
133 	return i;
134 }
135 
136 /* Decimal conversion is by far the most typical, and is used
137  * for /proc and /sys data. This directly impacts e.g. top performance
138  * with many processes running. We optimize it for speed
139  * using code from
140  * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
141  * (with permission from the author, Douglas W. Jones). */
142 
143 /* Formats correctly any integer in [0,99999].
144  * Outputs from one to five digits depending on input.
145  * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
146 static char* put_dec_trunc(char *buf, unsigned q)
147 {
148 	unsigned d3, d2, d1, d0;
149 	d1 = (q>>4) & 0xf;
150 	d2 = (q>>8) & 0xf;
151 	d3 = (q>>12);
152 
153 	d0 = 6*(d3 + d2 + d1) + (q & 0xf);
154 	q = (d0 * 0xcd) >> 11;
155 	d0 = d0 - 10*q;
156 	*buf++ = d0 + '0'; /* least significant digit */
157 	d1 = q + 9*d3 + 5*d2 + d1;
158 	if (d1 != 0) {
159 		q = (d1 * 0xcd) >> 11;
160 		d1 = d1 - 10*q;
161 		*buf++ = d1 + '0'; /* next digit */
162 
163 		d2 = q + 2*d2;
164 		if ((d2 != 0) || (d3 != 0)) {
165 			q = (d2 * 0xd) >> 7;
166 			d2 = d2 - 10*q;
167 			*buf++ = d2 + '0'; /* next digit */
168 
169 			d3 = q + 4*d3;
170 			if (d3 != 0) {
171 				q = (d3 * 0xcd) >> 11;
172 				d3 = d3 - 10*q;
173 				*buf++ = d3 + '0';  /* next digit */
174 				if (q != 0)
175 					*buf++ = q + '0';  /* most sign. digit */
176 			}
177 		}
178 	}
179 	return buf;
180 }
181 /* Same with if's removed. Always emits five digits */
182 static char* put_dec_full(char *buf, unsigned q)
183 {
184 	/* BTW, if q is in [0,9999], 8-bit ints will be enough, */
185 	/* but anyway, gcc produces better code with full-sized ints */
186 	unsigned d3, d2, d1, d0;
187 	d1 = (q>>4) & 0xf;
188 	d2 = (q>>8) & 0xf;
189 	d3 = (q>>12);
190 
191 	/*
192 	 * Possible ways to approx. divide by 10
193 	 * gcc -O2 replaces multiply with shifts and adds
194 	 * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
195 	 * (x * 0x67) >> 10:  1100111
196 	 * (x * 0x34) >> 9:    110100 - same
197 	 * (x * 0x1a) >> 8:     11010 - same
198 	 * (x * 0x0d) >> 7:      1101 - same, shortest code (on i386)
199 	 */
200 
201 	d0 = 6*(d3 + d2 + d1) + (q & 0xf);
202 	q = (d0 * 0xcd) >> 11;
203 	d0 = d0 - 10*q;
204 	*buf++ = d0 + '0';
205 	d1 = q + 9*d3 + 5*d2 + d1;
206 		q = (d1 * 0xcd) >> 11;
207 		d1 = d1 - 10*q;
208 		*buf++ = d1 + '0';
209 
210 		d2 = q + 2*d2;
211 			q = (d2 * 0xd) >> 7;
212 			d2 = d2 - 10*q;
213 			*buf++ = d2 + '0';
214 
215 			d3 = q + 4*d3;
216 				q = (d3 * 0xcd) >> 11; /* - shorter code */
217 				/* q = (d3 * 0x67) >> 10; - would also work */
218 				d3 = d3 - 10*q;
219 				*buf++ = d3 + '0';
220 					*buf++ = q + '0';
221 	return buf;
222 }
223 /* No inlining helps gcc to use registers better */
224 static noinline char* put_dec(char *buf, unsigned NUM_TYPE num)
225 {
226 	while (1) {
227 		unsigned rem;
228 		if (num < 100000)
229 			return put_dec_trunc(buf, num);
230 		rem = do_div(num, 100000);
231 		buf = put_dec_full(buf, rem);
232 	}
233 }
234 
235 #define ZEROPAD	1		/* pad with zero */
236 #define SIGN	2		/* unsigned/signed long */
237 #define PLUS	4		/* show plus */
238 #define SPACE	8		/* space if plus */
239 #define LEFT	16		/* left justified */
240 #define SMALL	32		/* Must be 32 == 0x20 */
241 #define SPECIAL	64		/* 0x */
242 
243 static char *number(char *buf, unsigned NUM_TYPE num, int base, int size, int precision, int type)
244 {
245 	/* we are called with base 8, 10 or 16, only, thus don't need "G..."  */
246 	static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
247 
248 	char tmp[66];
249 	char sign;
250 	char locase;
251 	int need_pfx = ((type & SPECIAL) && base != 10);
252 	int i;
253 
254 	/* locase = 0 or 0x20. ORing digits or letters with 'locase'
255 	 * produces same digits or (maybe lowercased) letters */
256 	locase = (type & SMALL);
257 	if (type & LEFT)
258 		type &= ~ZEROPAD;
259 	sign = 0;
260 	if (type & SIGN) {
261 		if ((signed NUM_TYPE) num < 0) {
262 			sign = '-';
263 			num = - (signed NUM_TYPE) num;
264 			size--;
265 		} else if (type & PLUS) {
266 			sign = '+';
267 			size--;
268 		} else if (type & SPACE) {
269 			sign = ' ';
270 			size--;
271 		}
272 	}
273 	if (need_pfx) {
274 		size--;
275 		if (base == 16)
276 			size--;
277 	}
278 
279 	/* generate full string in tmp[], in reverse order */
280 	i = 0;
281 	if (num == 0)
282 		tmp[i++] = '0';
283 	/* Generic code, for any base:
284 	else do {
285 		tmp[i++] = (digits[do_div(num,base)] | locase);
286 	} while (num != 0);
287 	*/
288 	else if (base != 10) { /* 8 or 16 */
289 		int mask = base - 1;
290 		int shift = 3;
291 		if (base == 16) shift = 4;
292 		do {
293 			tmp[i++] = (digits[((unsigned char)num) & mask] | locase);
294 			num >>= shift;
295 		} while (num);
296 	} else { /* base 10 */
297 		i = put_dec(tmp, num) - tmp;
298 	}
299 
300 	/* printing 100 using %2d gives "100", not "00" */
301 	if (i > precision)
302 		precision = i;
303 	/* leading space padding */
304 	size -= precision;
305 	if (!(type & (ZEROPAD+LEFT)))
306 		while(--size >= 0)
307 			*buf++ = ' ';
308 	/* sign */
309 	if (sign)
310 		*buf++ = sign;
311 	/* "0x" / "0" prefix */
312 	if (need_pfx) {
313 		*buf++ = '0';
314 		if (base == 16)
315 			*buf++ = ('X' | locase);
316 	}
317 	/* zero or space padding */
318 	if (!(type & LEFT)) {
319 		char c = (type & ZEROPAD) ? '0' : ' ';
320 		while (--size >= 0)
321 			*buf++ = c;
322 	}
323 	/* hmm even more zero padding? */
324 	while (i <= --precision)
325 		*buf++ = '0';
326 	/* actual digits of result */
327 	while (--i >= 0)
328 		*buf++ = tmp[i];
329 	/* trailing space padding */
330 	while (--size >= 0)
331 		*buf++ = ' ';
332 	return buf;
333 }
334 
335 static char *string(char *buf, char *s, int field_width, int precision, int flags)
336 {
337 	int len, i;
338 
339 	if (s == 0)
340 		s = "<NULL>";
341 
342 	len = strnlen(s, precision);
343 
344 	if (!(flags & LEFT))
345 		while (len < field_width--)
346 			*buf++ = ' ';
347 	for (i = 0; i < len; ++i)
348 		*buf++ = *s++;
349 	while (len < field_width--)
350 		*buf++ = ' ';
351 	return buf;
352 }
353 
354 #ifdef CONFIG_CMD_NET
355 static char *mac_address_string(char *buf, u8 *addr, int field_width,
356 				int precision, int flags)
357 {
358 	char mac_addr[6 * 3]; /* (6 * 2 hex digits), 5 colons and trailing zero */
359 	char *p = mac_addr;
360 	int i;
361 
362 	for (i = 0; i < 6; i++) {
363 		p = pack_hex_byte(p, addr[i]);
364 		if (!(flags & SPECIAL) && i != 5)
365 			*p++ = ':';
366 	}
367 	*p = '\0';
368 
369 	return string(buf, mac_addr, field_width, precision, flags & ~SPECIAL);
370 }
371 
372 static char *ip6_addr_string(char *buf, u8 *addr, int field_width,
373 			 int precision, int flags)
374 {
375 	char ip6_addr[8 * 5]; /* (8 * 4 hex digits), 7 colons and trailing zero */
376 	char *p = ip6_addr;
377 	int i;
378 
379 	for (i = 0; i < 8; i++) {
380 		p = pack_hex_byte(p, addr[2 * i]);
381 		p = pack_hex_byte(p, addr[2 * i + 1]);
382 		if (!(flags & SPECIAL) && i != 7)
383 			*p++ = ':';
384 	}
385 	*p = '\0';
386 
387 	return string(buf, ip6_addr, field_width, precision, flags & ~SPECIAL);
388 }
389 
390 static char *ip4_addr_string(char *buf, u8 *addr, int field_width,
391 			 int precision, int flags)
392 {
393 	char ip4_addr[4 * 4]; /* (4 * 3 decimal digits), 3 dots and trailing zero */
394 	char temp[3];	/* hold each IP quad in reverse order */
395 	char *p = ip4_addr;
396 	int i, digits;
397 
398 	for (i = 0; i < 4; i++) {
399 		digits = put_dec_trunc(temp, addr[i]) - temp;
400 		/* reverse the digits in the quad */
401 		while (digits--)
402 			*p++ = temp[digits];
403 		if (i != 3)
404 			*p++ = '.';
405 	}
406 	*p = '\0';
407 
408 	return string(buf, ip4_addr, field_width, precision, flags & ~SPECIAL);
409 }
410 #endif
411 
412 /*
413  * Show a '%p' thing.  A kernel extension is that the '%p' is followed
414  * by an extra set of alphanumeric characters that are extended format
415  * specifiers.
416  *
417  * Right now we handle:
418  *
419  * - 'M' For a 6-byte MAC address, it prints the address in the
420  *       usual colon-separated hex notation
421  * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
422  *       decimal for v4 and colon separated network-order 16 bit hex for v6)
423  * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
424  *       currently the same
425  *
426  * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
427  * function pointers are really function descriptors, which contain a
428  * pointer to the real address.
429  */
430 static char *pointer(const char *fmt, char *buf, void *ptr, int field_width, int precision, int flags)
431 {
432 	if (!ptr)
433 		return string(buf, "(null)", field_width, precision, flags);
434 
435 #ifdef CONFIG_CMD_NET
436 	switch (*fmt) {
437 	case 'm':
438 		flags |= SPECIAL;
439 		/* Fallthrough */
440 	case 'M':
441 		return mac_address_string(buf, ptr, field_width, precision, flags);
442 	case 'i':
443 		flags |= SPECIAL;
444 		/* Fallthrough */
445 	case 'I':
446 		if (fmt[1] == '6')
447 			return ip6_addr_string(buf, ptr, field_width, precision, flags);
448 		if (fmt[1] == '4')
449 			return ip4_addr_string(buf, ptr, field_width, precision, flags);
450 		flags &= ~SPECIAL;
451 		break;
452 	}
453 #endif
454 	flags |= SMALL;
455 	if (field_width == -1) {
456 		field_width = 2*sizeof(void *);
457 		flags |= ZEROPAD;
458 	}
459 	return number(buf, (unsigned long) ptr, 16, field_width, precision, flags);
460 }
461 
462 /**
463  * vsprintf - Format a string and place it in a buffer
464  * @buf: The buffer to place the result into
465  * @fmt: The format string to use
466  * @args: Arguments for the format string
467  *
468  * This function follows C99 vsprintf, but has some extensions:
469  * %pS output the name of a text symbol
470  * %pF output the name of a function pointer
471  * %pR output the address range in a struct resource
472  *
473  * The function returns the number of characters written
474  * into @buf.
475  *
476  * Call this function if you are already dealing with a va_list.
477  * You probably want sprintf() instead.
478  */
479 int vsprintf(char *buf, const char *fmt, va_list args)
480 {
481 	unsigned NUM_TYPE num;
482 	int base;
483 	char *str;
484 
485 	int flags;		/* flags to number() */
486 
487 	int field_width;	/* width of output field */
488 	int precision;		/* min. # of digits for integers; max
489 				   number of chars for from string */
490 	int qualifier;		/* 'h', 'l', or 'L' for integer fields */
491 				/* 'z' support added 23/7/1999 S.H.    */
492 				/* 'z' changed to 'Z' --davidm 1/25/99 */
493 				/* 't' added for ptrdiff_t */
494 
495 	str = buf;
496 
497 	for (; *fmt ; ++fmt) {
498 		if (*fmt != '%') {
499 			*str++ = *fmt;
500 			continue;
501 		}
502 
503 		/* process flags */
504 		flags = 0;
505 		repeat:
506 			++fmt;		/* this also skips first '%' */
507 			switch (*fmt) {
508 				case '-': flags |= LEFT; goto repeat;
509 				case '+': flags |= PLUS; goto repeat;
510 				case ' ': flags |= SPACE; goto repeat;
511 				case '#': flags |= SPECIAL; goto repeat;
512 				case '0': flags |= ZEROPAD; goto repeat;
513 			}
514 
515 		/* get field width */
516 		field_width = -1;
517 		if (is_digit(*fmt))
518 			field_width = skip_atoi(&fmt);
519 		else if (*fmt == '*') {
520 			++fmt;
521 			/* it's the next argument */
522 			field_width = va_arg(args, int);
523 			if (field_width < 0) {
524 				field_width = -field_width;
525 				flags |= LEFT;
526 			}
527 		}
528 
529 		/* get the precision */
530 		precision = -1;
531 		if (*fmt == '.') {
532 			++fmt;
533 			if (is_digit(*fmt))
534 				precision = skip_atoi(&fmt);
535 			else if (*fmt == '*') {
536 				++fmt;
537 				/* it's the next argument */
538 				precision = va_arg(args, int);
539 			}
540 			if (precision < 0)
541 				precision = 0;
542 		}
543 
544 		/* get the conversion qualifier */
545 		qualifier = -1;
546 		if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
547 		    *fmt == 'Z' || *fmt == 'z' || *fmt == 't') {
548 			qualifier = *fmt;
549 			++fmt;
550 			if (qualifier == 'l' && *fmt == 'l') {
551 				qualifier = 'L';
552 				++fmt;
553 			}
554 		}
555 
556 		/* default base */
557 		base = 10;
558 
559 		switch (*fmt) {
560 		case 'c':
561 			if (!(flags & LEFT))
562 				while (--field_width > 0)
563 					*str++ = ' ';
564 			*str++ = (unsigned char) va_arg(args, int);
565 			while (--field_width > 0)
566 				*str++ = ' ';
567 			continue;
568 
569 		case 's':
570 			str = string(str, va_arg(args, char *), field_width, precision, flags);
571 			continue;
572 
573 		case 'p':
574 			str = pointer(fmt+1, str,
575 					va_arg(args, void *),
576 					field_width, precision, flags);
577 			/* Skip all alphanumeric pointer suffixes */
578 			while (isalnum(fmt[1]))
579 				fmt++;
580 			continue;
581 
582 		case 'n':
583 			if (qualifier == 'l') {
584 				long * ip = va_arg(args, long *);
585 				*ip = (str - buf);
586 			} else {
587 				int * ip = va_arg(args, int *);
588 				*ip = (str - buf);
589 			}
590 			continue;
591 
592 		case '%':
593 			*str++ = '%';
594 			continue;
595 
596 		/* integer number formats - set up the flags and "break" */
597 		case 'o':
598 			base = 8;
599 			break;
600 
601 		case 'x':
602 			flags |= SMALL;
603 		case 'X':
604 			base = 16;
605 			break;
606 
607 		case 'd':
608 		case 'i':
609 			flags |= SIGN;
610 		case 'u':
611 			break;
612 
613 		default:
614 			*str++ = '%';
615 			if (*fmt)
616 				*str++ = *fmt;
617 			else
618 				--fmt;
619 			continue;
620 		}
621 		if (qualifier == 'L')  /* "quad" for 64 bit variables */
622 			num = va_arg(args, unsigned long long);
623 		else if (qualifier == 'l') {
624 			num = va_arg(args, unsigned long);
625 			if (flags & SIGN)
626 				num = (signed long) num;
627 		} else if (qualifier == 'Z' || qualifier == 'z') {
628 			num = va_arg(args, size_t);
629 		} else if (qualifier == 't') {
630 			num = va_arg(args, ptrdiff_t);
631 		} else if (qualifier == 'h') {
632 			num = (unsigned short) va_arg(args, int);
633 			if (flags & SIGN)
634 				num = (signed short) num;
635 		} else {
636 			num = va_arg(args, unsigned int);
637 			if (flags & SIGN)
638 				num = (signed int) num;
639 		}
640 		str = number(str, num, base, field_width, precision, flags);
641 	}
642 	*str = '\0';
643 	return str-buf;
644 }
645 
646 /**
647  * sprintf - Format a string and place it in a buffer
648  * @buf: The buffer to place the result into
649  * @fmt: The format string to use
650  * @...: Arguments for the format string
651  *
652  * The function returns the number of characters written
653  * into @buf.
654  *
655  * See the vsprintf() documentation for format string extensions over C99.
656  */
657 int sprintf(char * buf, const char *fmt, ...)
658 {
659 	va_list args;
660 	int i;
661 
662 	va_start(args, fmt);
663 	i=vsprintf(buf,fmt,args);
664 	va_end(args);
665 	return i;
666 }
667 
668 void panic(const char *fmt, ...)
669 {
670 	va_list	args;
671 	va_start(args, fmt);
672 	vprintf(fmt, args);
673 	putc('\n');
674 	va_end(args);
675 #if defined (CONFIG_PANIC_HANG)
676 	hang();
677 #else
678 	udelay (100000);	/* allow messages to go out */
679 	do_reset (NULL, 0, 0, NULL);
680 #endif
681 }
682