xref: /openbmc/linux/lib/vsprintf.c (revision d5cb9783536a41df9f9cba5b0a1d78047ed787f7)
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 /*
13  * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com>
14  * - changed to provide snprintf and vsnprintf functions
15  * So Feb  1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de>
16  * - scnprintf and vscnprintf
17  */
18 
19 #include <stdarg.h>
20 #include <linux/module.h>
21 #include <linux/types.h>
22 #include <linux/string.h>
23 #include <linux/ctype.h>
24 #include <linux/kernel.h>
25 
26 #include <asm/page.h>		/* for PAGE_SIZE */
27 #include <asm/div64.h>
28 
29 /**
30  * simple_strtoul - convert a string to an unsigned long
31  * @cp: The start of the string
32  * @endp: A pointer to the end of the parsed string will be placed here
33  * @base: The number base to use
34  */
35 unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base)
36 {
37 	unsigned long result = 0,value;
38 
39 	if (!base) {
40 		base = 10;
41 		if (*cp == '0') {
42 			base = 8;
43 			cp++;
44 			if ((toupper(*cp) == 'X') && isxdigit(cp[1])) {
45 				cp++;
46 				base = 16;
47 			}
48 		}
49 	} else if (base == 16) {
50 		if (cp[0] == '0' && toupper(cp[1]) == 'X')
51 			cp += 2;
52 	}
53 	while (isxdigit(*cp) &&
54 	       (value = isdigit(*cp) ? *cp-'0' : toupper(*cp)-'A'+10) < base) {
55 		result = result*base + value;
56 		cp++;
57 	}
58 	if (endp)
59 		*endp = (char *)cp;
60 	return result;
61 }
62 
63 EXPORT_SYMBOL(simple_strtoul);
64 
65 /**
66  * simple_strtol - convert a string to a signed long
67  * @cp: The start of the string
68  * @endp: A pointer to the end of the parsed string will be placed here
69  * @base: The number base to use
70  */
71 long simple_strtol(const char *cp,char **endp,unsigned int base)
72 {
73 	if(*cp=='-')
74 		return -simple_strtoul(cp+1,endp,base);
75 	return simple_strtoul(cp,endp,base);
76 }
77 
78 EXPORT_SYMBOL(simple_strtol);
79 
80 /**
81  * simple_strtoull - convert a string to an unsigned long long
82  * @cp: The start of the string
83  * @endp: A pointer to the end of the parsed string will be placed here
84  * @base: The number base to use
85  */
86 unsigned long long simple_strtoull(const char *cp,char **endp,unsigned int base)
87 {
88 	unsigned long long result = 0,value;
89 
90 	if (!base) {
91 		base = 10;
92 		if (*cp == '0') {
93 			base = 8;
94 			cp++;
95 			if ((toupper(*cp) == 'X') && isxdigit(cp[1])) {
96 				cp++;
97 				base = 16;
98 			}
99 		}
100 	} else if (base == 16) {
101 		if (cp[0] == '0' && toupper(cp[1]) == 'X')
102 			cp += 2;
103 	}
104 	while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
105 	    ? toupper(*cp) : *cp)-'A'+10) < base) {
106 		result = result*base + value;
107 		cp++;
108 	}
109 	if (endp)
110 		*endp = (char *)cp;
111 	return result;
112 }
113 
114 EXPORT_SYMBOL(simple_strtoull);
115 
116 /**
117  * simple_strtoll - convert a string to a signed long long
118  * @cp: The start of the string
119  * @endp: A pointer to the end of the parsed string will be placed here
120  * @base: The number base to use
121  */
122 long long simple_strtoll(const char *cp,char **endp,unsigned int base)
123 {
124 	if(*cp=='-')
125 		return -simple_strtoull(cp+1,endp,base);
126 	return simple_strtoull(cp,endp,base);
127 }
128 
129 static int skip_atoi(const char **s)
130 {
131 	int i=0;
132 
133 	while (isdigit(**s))
134 		i = i*10 + *((*s)++) - '0';
135 	return i;
136 }
137 
138 #define ZEROPAD	1		/* pad with zero */
139 #define SIGN	2		/* unsigned/signed long */
140 #define PLUS	4		/* show plus */
141 #define SPACE	8		/* space if plus */
142 #define LEFT	16		/* left justified */
143 #define SPECIAL	32		/* 0x */
144 #define LARGE	64		/* use 'ABCDEF' instead of 'abcdef' */
145 
146 static char * number(char * buf, char * end, unsigned long long num, int base, int size, int precision, int type)
147 {
148 	char c,sign,tmp[66];
149 	const char *digits;
150 	static const char small_digits[] = "0123456789abcdefghijklmnopqrstuvwxyz";
151 	static const char large_digits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
152 	int i;
153 
154 	digits = (type & LARGE) ? large_digits : small_digits;
155 	if (type & LEFT)
156 		type &= ~ZEROPAD;
157 	if (base < 2 || base > 36)
158 		return NULL;
159 	c = (type & ZEROPAD) ? '0' : ' ';
160 	sign = 0;
161 	if (type & SIGN) {
162 		if ((signed long long) num < 0) {
163 			sign = '-';
164 			num = - (signed long long) num;
165 			size--;
166 		} else if (type & PLUS) {
167 			sign = '+';
168 			size--;
169 		} else if (type & SPACE) {
170 			sign = ' ';
171 			size--;
172 		}
173 	}
174 	if (type & SPECIAL) {
175 		if (base == 16)
176 			size -= 2;
177 		else if (base == 8)
178 			size--;
179 	}
180 	i = 0;
181 	if (num == 0)
182 		tmp[i++]='0';
183 	else while (num != 0)
184 		tmp[i++] = digits[do_div(num,base)];
185 	if (i > precision)
186 		precision = i;
187 	size -= precision;
188 	if (!(type&(ZEROPAD+LEFT))) {
189 		while(size-->0) {
190 			if (buf <= end)
191 				*buf = ' ';
192 			++buf;
193 		}
194 	}
195 	if (sign) {
196 		if (buf <= end)
197 			*buf = sign;
198 		++buf;
199 	}
200 	if (type & SPECIAL) {
201 		if (base==8) {
202 			if (buf <= end)
203 				*buf = '0';
204 			++buf;
205 		} else if (base==16) {
206 			if (buf <= end)
207 				*buf = '0';
208 			++buf;
209 			if (buf <= end)
210 				*buf = digits[33];
211 			++buf;
212 		}
213 	}
214 	if (!(type & LEFT)) {
215 		while (size-- > 0) {
216 			if (buf <= end)
217 				*buf = c;
218 			++buf;
219 		}
220 	}
221 	while (i < precision--) {
222 		if (buf <= end)
223 			*buf = '0';
224 		++buf;
225 	}
226 	while (i-- > 0) {
227 		if (buf <= end)
228 			*buf = tmp[i];
229 		++buf;
230 	}
231 	while (size-- > 0) {
232 		if (buf <= end)
233 			*buf = ' ';
234 		++buf;
235 	}
236 	return buf;
237 }
238 
239 /**
240  * vsnprintf - Format a string and place it in a buffer
241  * @buf: The buffer to place the result into
242  * @size: The size of the buffer, including the trailing null space
243  * @fmt: The format string to use
244  * @args: Arguments for the format string
245  *
246  * The return value is the number of characters which would
247  * be generated for the given input, excluding the trailing
248  * '\0', as per ISO C99. If you want to have the exact
249  * number of characters written into @buf as return value
250  * (not including the trailing '\0'), use vscnprintf. If the
251  * return is greater than or equal to @size, the resulting
252  * string is truncated.
253  *
254  * Call this function if you are already dealing with a va_list.
255  * You probably want snprintf instead.
256  */
257 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
258 {
259 	int len;
260 	unsigned long long num;
261 	int i, base;
262 	char *str, *end, c;
263 	const char *s;
264 
265 	int flags;		/* flags to number() */
266 
267 	int field_width;	/* width of output field */
268 	int precision;		/* min. # of digits for integers; max
269 				   number of chars for from string */
270 	int qualifier;		/* 'h', 'l', or 'L' for integer fields */
271 				/* 'z' support added 23/7/1999 S.H.    */
272 				/* 'z' changed to 'Z' --davidm 1/25/99 */
273 				/* 't' added for ptrdiff_t */
274 
275 	/* Reject out-of-range values early */
276 	if (unlikely((int) size < 0)) {
277 		/* There can be only one.. */
278 		static int warn = 1;
279 		WARN_ON(warn);
280 		warn = 0;
281 		return 0;
282 	}
283 
284 	str = buf;
285 	end = buf + size - 1;
286 
287 	if (end < buf - 1) {
288 		end = ((void *) -1);
289 		size = end - buf + 1;
290 	}
291 
292 	for (; *fmt ; ++fmt) {
293 		if (*fmt != '%') {
294 			if (str <= end)
295 				*str = *fmt;
296 			++str;
297 			continue;
298 		}
299 
300 		/* process flags */
301 		flags = 0;
302 		repeat:
303 			++fmt;		/* this also skips first '%' */
304 			switch (*fmt) {
305 				case '-': flags |= LEFT; goto repeat;
306 				case '+': flags |= PLUS; goto repeat;
307 				case ' ': flags |= SPACE; goto repeat;
308 				case '#': flags |= SPECIAL; goto repeat;
309 				case '0': flags |= ZEROPAD; goto repeat;
310 			}
311 
312 		/* get field width */
313 		field_width = -1;
314 		if (isdigit(*fmt))
315 			field_width = skip_atoi(&fmt);
316 		else if (*fmt == '*') {
317 			++fmt;
318 			/* it's the next argument */
319 			field_width = va_arg(args, int);
320 			if (field_width < 0) {
321 				field_width = -field_width;
322 				flags |= LEFT;
323 			}
324 		}
325 
326 		/* get the precision */
327 		precision = -1;
328 		if (*fmt == '.') {
329 			++fmt;
330 			if (isdigit(*fmt))
331 				precision = skip_atoi(&fmt);
332 			else if (*fmt == '*') {
333 				++fmt;
334 				/* it's the next argument */
335 				precision = va_arg(args, int);
336 			}
337 			if (precision < 0)
338 				precision = 0;
339 		}
340 
341 		/* get the conversion qualifier */
342 		qualifier = -1;
343 		if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
344 		    *fmt =='Z' || *fmt == 'z' || *fmt == 't') {
345 			qualifier = *fmt;
346 			++fmt;
347 			if (qualifier == 'l' && *fmt == 'l') {
348 				qualifier = 'L';
349 				++fmt;
350 			}
351 		}
352 
353 		/* default base */
354 		base = 10;
355 
356 		switch (*fmt) {
357 			case 'c':
358 				if (!(flags & LEFT)) {
359 					while (--field_width > 0) {
360 						if (str <= end)
361 							*str = ' ';
362 						++str;
363 					}
364 				}
365 				c = (unsigned char) va_arg(args, int);
366 				if (str <= end)
367 					*str = c;
368 				++str;
369 				while (--field_width > 0) {
370 					if (str <= end)
371 						*str = ' ';
372 					++str;
373 				}
374 				continue;
375 
376 			case 's':
377 				s = va_arg(args, char *);
378 				if ((unsigned long)s < PAGE_SIZE)
379 					s = "<NULL>";
380 
381 				len = strnlen(s, precision);
382 
383 				if (!(flags & LEFT)) {
384 					while (len < field_width--) {
385 						if (str <= end)
386 							*str = ' ';
387 						++str;
388 					}
389 				}
390 				for (i = 0; i < len; ++i) {
391 					if (str <= end)
392 						*str = *s;
393 					++str; ++s;
394 				}
395 				while (len < field_width--) {
396 					if (str <= end)
397 						*str = ' ';
398 					++str;
399 				}
400 				continue;
401 
402 			case 'p':
403 				if (field_width == -1) {
404 					field_width = 2*sizeof(void *);
405 					flags |= ZEROPAD;
406 				}
407 				str = number(str, end,
408 						(unsigned long) va_arg(args, void *),
409 						16, field_width, precision, flags);
410 				continue;
411 
412 
413 			case 'n':
414 				/* FIXME:
415 				* What does C99 say about the overflow case here? */
416 				if (qualifier == 'l') {
417 					long * ip = va_arg(args, long *);
418 					*ip = (str - buf);
419 				} else if (qualifier == 'Z' || qualifier == 'z') {
420 					size_t * ip = va_arg(args, size_t *);
421 					*ip = (str - buf);
422 				} else {
423 					int * ip = va_arg(args, int *);
424 					*ip = (str - buf);
425 				}
426 				continue;
427 
428 			case '%':
429 				if (str <= end)
430 					*str = '%';
431 				++str;
432 				continue;
433 
434 				/* integer number formats - set up the flags and "break" */
435 			case 'o':
436 				base = 8;
437 				break;
438 
439 			case 'X':
440 				flags |= LARGE;
441 			case 'x':
442 				base = 16;
443 				break;
444 
445 			case 'd':
446 			case 'i':
447 				flags |= SIGN;
448 			case 'u':
449 				break;
450 
451 			default:
452 				if (str <= end)
453 					*str = '%';
454 				++str;
455 				if (*fmt) {
456 					if (str <= end)
457 						*str = *fmt;
458 					++str;
459 				} else {
460 					--fmt;
461 				}
462 				continue;
463 		}
464 		if (qualifier == 'L')
465 			num = va_arg(args, long long);
466 		else if (qualifier == 'l') {
467 			num = va_arg(args, unsigned long);
468 			if (flags & SIGN)
469 				num = (signed long) num;
470 		} else if (qualifier == 'Z' || qualifier == 'z') {
471 			num = va_arg(args, size_t);
472 		} else if (qualifier == 't') {
473 			num = va_arg(args, ptrdiff_t);
474 		} else if (qualifier == 'h') {
475 			num = (unsigned short) va_arg(args, int);
476 			if (flags & SIGN)
477 				num = (signed short) num;
478 		} else {
479 			num = va_arg(args, unsigned int);
480 			if (flags & SIGN)
481 				num = (signed int) num;
482 		}
483 		str = number(str, end, num, base,
484 				field_width, precision, flags);
485 	}
486 	if (str <= end)
487 		*str = '\0';
488 	else if (size > 0)
489 		/* don't write out a null byte if the buf size is zero */
490 		*end = '\0';
491 	/* the trailing null byte doesn't count towards the total
492 	* ++str;
493 	*/
494 	return str-buf;
495 }
496 
497 EXPORT_SYMBOL(vsnprintf);
498 
499 /**
500  * vscnprintf - Format a string and place it in a buffer
501  * @buf: The buffer to place the result into
502  * @size: The size of the buffer, including the trailing null space
503  * @fmt: The format string to use
504  * @args: Arguments for the format string
505  *
506  * The return value is the number of characters which have been written into
507  * the @buf not including the trailing '\0'. If @size is <= 0 the function
508  * returns 0.
509  *
510  * Call this function if you are already dealing with a va_list.
511  * You probably want scnprintf instead.
512  */
513 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
514 {
515 	int i;
516 
517 	i=vsnprintf(buf,size,fmt,args);
518 	return (i >= size) ? (size - 1) : i;
519 }
520 
521 EXPORT_SYMBOL(vscnprintf);
522 
523 /**
524  * snprintf - Format a string and place it in a buffer
525  * @buf: The buffer to place the result into
526  * @size: The size of the buffer, including the trailing null space
527  * @fmt: The format string to use
528  * @...: Arguments for the format string
529  *
530  * The return value is the number of characters which would be
531  * generated for the given input, excluding the trailing null,
532  * as per ISO C99.  If the return is greater than or equal to
533  * @size, the resulting string is truncated.
534  */
535 int snprintf(char * buf, size_t size, const char *fmt, ...)
536 {
537 	va_list args;
538 	int i;
539 
540 	va_start(args, fmt);
541 	i=vsnprintf(buf,size,fmt,args);
542 	va_end(args);
543 	return i;
544 }
545 
546 EXPORT_SYMBOL(snprintf);
547 
548 /**
549  * scnprintf - Format a string and place it in a buffer
550  * @buf: The buffer to place the result into
551  * @size: The size of the buffer, including the trailing null space
552  * @fmt: The format string to use
553  * @...: Arguments for the format string
554  *
555  * The return value is the number of characters written into @buf not including
556  * the trailing '\0'. If @size is <= 0 the function returns 0. If the return is
557  * greater than or equal to @size, the resulting string is truncated.
558  */
559 
560 int scnprintf(char * buf, size_t size, const char *fmt, ...)
561 {
562 	va_list args;
563 	int i;
564 
565 	va_start(args, fmt);
566 	i = vsnprintf(buf, size, fmt, args);
567 	va_end(args);
568 	return (i >= size) ? (size - 1) : i;
569 }
570 EXPORT_SYMBOL(scnprintf);
571 
572 /**
573  * vsprintf - Format a string and place it in a buffer
574  * @buf: The buffer to place the result into
575  * @fmt: The format string to use
576  * @args: Arguments for the format string
577  *
578  * The function returns the number of characters written
579  * into @buf. Use vsnprintf or vscnprintf in order to avoid
580  * buffer overflows.
581  *
582  * Call this function if you are already dealing with a va_list.
583  * You probably want sprintf instead.
584  */
585 int vsprintf(char *buf, const char *fmt, va_list args)
586 {
587 	return vsnprintf(buf, INT_MAX, fmt, args);
588 }
589 
590 EXPORT_SYMBOL(vsprintf);
591 
592 /**
593  * sprintf - Format a string and place it in a buffer
594  * @buf: The buffer to place the result into
595  * @fmt: The format string to use
596  * @...: Arguments for the format string
597  *
598  * The function returns the number of characters written
599  * into @buf. Use snprintf or scnprintf in order to avoid
600  * buffer overflows.
601  */
602 int sprintf(char * buf, const char *fmt, ...)
603 {
604 	va_list args;
605 	int i;
606 
607 	va_start(args, fmt);
608 	i=vsnprintf(buf, INT_MAX, fmt, args);
609 	va_end(args);
610 	return i;
611 }
612 
613 EXPORT_SYMBOL(sprintf);
614 
615 /**
616  * vsscanf - Unformat a buffer into a list of arguments
617  * @buf:	input buffer
618  * @fmt:	format of buffer
619  * @args:	arguments
620  */
621 int vsscanf(const char * buf, const char * fmt, va_list args)
622 {
623 	const char *str = buf;
624 	char *next;
625 	char digit;
626 	int num = 0;
627 	int qualifier;
628 	int base;
629 	int field_width;
630 	int is_sign = 0;
631 
632 	while(*fmt && *str) {
633 		/* skip any white space in format */
634 		/* white space in format matchs any amount of
635 		 * white space, including none, in the input.
636 		 */
637 		if (isspace(*fmt)) {
638 			while (isspace(*fmt))
639 				++fmt;
640 			while (isspace(*str))
641 				++str;
642 		}
643 
644 		/* anything that is not a conversion must match exactly */
645 		if (*fmt != '%' && *fmt) {
646 			if (*fmt++ != *str++)
647 				break;
648 			continue;
649 		}
650 
651 		if (!*fmt)
652 			break;
653 		++fmt;
654 
655 		/* skip this conversion.
656 		 * advance both strings to next white space
657 		 */
658 		if (*fmt == '*') {
659 			while (!isspace(*fmt) && *fmt)
660 				fmt++;
661 			while (!isspace(*str) && *str)
662 				str++;
663 			continue;
664 		}
665 
666 		/* get field width */
667 		field_width = -1;
668 		if (isdigit(*fmt))
669 			field_width = skip_atoi(&fmt);
670 
671 		/* get conversion qualifier */
672 		qualifier = -1;
673 		if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
674 		    *fmt == 'Z' || *fmt == 'z') {
675 			qualifier = *fmt++;
676 			if (unlikely(qualifier == *fmt)) {
677 				if (qualifier == 'h') {
678 					qualifier = 'H';
679 					fmt++;
680 				} else if (qualifier == 'l') {
681 					qualifier = 'L';
682 					fmt++;
683 				}
684 			}
685 		}
686 		base = 10;
687 		is_sign = 0;
688 
689 		if (!*fmt || !*str)
690 			break;
691 
692 		switch(*fmt++) {
693 		case 'c':
694 		{
695 			char *s = (char *) va_arg(args,char*);
696 			if (field_width == -1)
697 				field_width = 1;
698 			do {
699 				*s++ = *str++;
700 			} while (--field_width > 0 && *str);
701 			num++;
702 		}
703 		continue;
704 		case 's':
705 		{
706 			char *s = (char *) va_arg(args, char *);
707 			if(field_width == -1)
708 				field_width = INT_MAX;
709 			/* first, skip leading white space in buffer */
710 			while (isspace(*str))
711 				str++;
712 
713 			/* now copy until next white space */
714 			while (*str && !isspace(*str) && field_width--) {
715 				*s++ = *str++;
716 			}
717 			*s = '\0';
718 			num++;
719 		}
720 		continue;
721 		case 'n':
722 			/* return number of characters read so far */
723 		{
724 			int *i = (int *)va_arg(args,int*);
725 			*i = str - buf;
726 		}
727 		continue;
728 		case 'o':
729 			base = 8;
730 			break;
731 		case 'x':
732 		case 'X':
733 			base = 16;
734 			break;
735 		case 'i':
736                         base = 0;
737 		case 'd':
738 			is_sign = 1;
739 		case 'u':
740 			break;
741 		case '%':
742 			/* looking for '%' in str */
743 			if (*str++ != '%')
744 				return num;
745 			continue;
746 		default:
747 			/* invalid format; stop here */
748 			return num;
749 		}
750 
751 		/* have some sort of integer conversion.
752 		 * first, skip white space in buffer.
753 		 */
754 		while (isspace(*str))
755 			str++;
756 
757 		digit = *str;
758 		if (is_sign && digit == '-')
759 			digit = *(str + 1);
760 
761 		if (!digit
762                     || (base == 16 && !isxdigit(digit))
763                     || (base == 10 && !isdigit(digit))
764                     || (base == 8 && (!isdigit(digit) || digit > '7'))
765                     || (base == 0 && !isdigit(digit)))
766 				break;
767 
768 		switch(qualifier) {
769 		case 'H':	/* that's 'hh' in format */
770 			if (is_sign) {
771 				signed char *s = (signed char *) va_arg(args,signed char *);
772 				*s = (signed char) simple_strtol(str,&next,base);
773 			} else {
774 				unsigned char *s = (unsigned char *) va_arg(args, unsigned char *);
775 				*s = (unsigned char) simple_strtoul(str, &next, base);
776 			}
777 			break;
778 		case 'h':
779 			if (is_sign) {
780 				short *s = (short *) va_arg(args,short *);
781 				*s = (short) simple_strtol(str,&next,base);
782 			} else {
783 				unsigned short *s = (unsigned short *) va_arg(args, unsigned short *);
784 				*s = (unsigned short) simple_strtoul(str, &next, base);
785 			}
786 			break;
787 		case 'l':
788 			if (is_sign) {
789 				long *l = (long *) va_arg(args,long *);
790 				*l = simple_strtol(str,&next,base);
791 			} else {
792 				unsigned long *l = (unsigned long*) va_arg(args,unsigned long*);
793 				*l = simple_strtoul(str,&next,base);
794 			}
795 			break;
796 		case 'L':
797 			if (is_sign) {
798 				long long *l = (long long*) va_arg(args,long long *);
799 				*l = simple_strtoll(str,&next,base);
800 			} else {
801 				unsigned long long *l = (unsigned long long*) va_arg(args,unsigned long long*);
802 				*l = simple_strtoull(str,&next,base);
803 			}
804 			break;
805 		case 'Z':
806 		case 'z':
807 		{
808 			size_t *s = (size_t*) va_arg(args,size_t*);
809 			*s = (size_t) simple_strtoul(str,&next,base);
810 		}
811 		break;
812 		default:
813 			if (is_sign) {
814 				int *i = (int *) va_arg(args, int*);
815 				*i = (int) simple_strtol(str,&next,base);
816 			} else {
817 				unsigned int *i = (unsigned int*) va_arg(args, unsigned int*);
818 				*i = (unsigned int) simple_strtoul(str,&next,base);
819 			}
820 			break;
821 		}
822 		num++;
823 
824 		if (!next)
825 			break;
826 		str = next;
827 	}
828 	return num;
829 }
830 
831 EXPORT_SYMBOL(vsscanf);
832 
833 /**
834  * sscanf - Unformat a buffer into a list of arguments
835  * @buf:	input buffer
836  * @fmt:	formatting of buffer
837  * @...:	resulting arguments
838  */
839 int sscanf(const char * buf, const char * fmt, ...)
840 {
841 	va_list args;
842 	int i;
843 
844 	va_start(args,fmt);
845 	i = vsscanf(buf,fmt,args);
846 	va_end(args);
847 	return i;
848 }
849 
850 EXPORT_SYMBOL(sscanf);
851