4 * Copyright (C) 1991, 1992 Linus Torvalds
7 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
9 * Wirzenius wrote this portably, Torvalds fucked it up :-)
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
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>
26 #include <asm/div64.h>
29 * simple_strtoul - convert a string to an unsigned long
30 * @cp: The start of the string
31 * @endp: A pointer to the end of the parsed string will be placed here
32 * @base: The number base to use
34 unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base)
36 unsigned long result = 0,value;
43 if ((*cp == 'x') && isxdigit(cp[1])) {
49 while (isxdigit(*cp) &&
50 (value = isdigit(*cp) ? *cp-'0' : toupper(*cp)-'A'+10) < base) {
51 result = result*base + value;
59 EXPORT_SYMBOL(simple_strtoul);
62 * simple_strtol - convert a string to a signed long
63 * @cp: The start of the string
64 * @endp: A pointer to the end of the parsed string will be placed here
65 * @base: The number base to use
67 long simple_strtol(const char *cp,char **endp,unsigned int base)
70 return -simple_strtoul(cp+1,endp,base);
71 return simple_strtoul(cp,endp,base);
74 EXPORT_SYMBOL(simple_strtol);
77 * simple_strtoull - convert a string to an unsigned long long
78 * @cp: The start of the string
79 * @endp: A pointer to the end of the parsed string will be placed here
80 * @base: The number base to use
82 unsigned long long simple_strtoull(const char *cp,char **endp,unsigned int base)
84 unsigned long long result = 0,value;
91 if ((*cp == 'x') && isxdigit(cp[1])) {
97 while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
98 ? toupper(*cp) : *cp)-'A'+10) < base) {
99 result = result*base + value;
107 EXPORT_SYMBOL(simple_strtoull);
110 * simple_strtoll - convert a string to a signed long long
111 * @cp: The start of the string
112 * @endp: A pointer to the end of the parsed string will be placed here
113 * @base: The number base to use
115 long long simple_strtoll(const char *cp,char **endp,unsigned int base)
118 return -simple_strtoull(cp+1,endp,base);
119 return simple_strtoull(cp,endp,base);
122 static int skip_atoi(const char **s)
127 i = i*10 + *((*s)++) - '0';
131 #define ZEROPAD 1 /* pad with zero */
132 #define SIGN 2 /* unsigned/signed long */
133 #define PLUS 4 /* show plus */
134 #define SPACE 8 /* space if plus */
135 #define LEFT 16 /* left justified */
136 #define SPECIAL 32 /* 0x */
137 #define LARGE 64 /* use 'ABCDEF' instead of 'abcdef' */
139 static char * number(char * buf, char * end, unsigned long long num, int base, int size, int precision, int type)
143 static const char small_digits[] = "0123456789abcdefghijklmnopqrstuvwxyz";
144 static const char large_digits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
147 digits = (type & LARGE) ? large_digits : small_digits;
150 if (base < 2 || base > 36)
152 c = (type & ZEROPAD) ? '0' : ' ';
155 if ((signed long long) num < 0) {
157 num = - (signed long long) num;
159 } else if (type & PLUS) {
162 } else if (type & SPACE) {
167 if (type & SPECIAL) {
176 else while (num != 0)
177 tmp[i++] = digits[do_div(num,base)];
181 if (!(type&(ZEROPAD+LEFT))) {
193 if (type & SPECIAL) {
198 } else if (base==16) {
207 if (!(type & LEFT)) {
214 while (i < precision--) {
233 * vsnprintf - Format a string and place it in a buffer
234 * @buf: The buffer to place the result into
235 * @size: The size of the buffer, including the trailing null space
236 * @fmt: The format string to use
237 * @args: Arguments for the format string
239 * The return value is the number of characters which would
240 * be generated for the given input, excluding the trailing
241 * '\0', as per ISO C99. If you want to have the exact
242 * number of characters written into @buf as return value
243 * (not including the trailing '\0'), use vscnprintf. If the
244 * return is greater than or equal to @size, the resulting
245 * string is truncated.
247 * Call this function if you are already dealing with a va_list.
248 * You probably want snprintf instead.
250 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
253 unsigned long long num;
258 int flags; /* flags to number() */
260 int field_width; /* width of output field */
261 int precision; /* min. # of digits for integers; max
262 number of chars for from string */
263 int qualifier; /* 'h', 'l', or 'L' for integer fields */
264 /* 'z' support added 23/7/1999 S.H. */
265 /* 'z' changed to 'Z' --davidm 1/25/99 */
267 /* Reject out-of-range values early */
268 if (unlikely((int) size < 0)) {
269 /* There can be only one.. */
277 end = buf + size - 1;
281 size = end - buf + 1;
284 for (; *fmt ; ++fmt) {
295 ++fmt; /* this also skips first '%' */
297 case '-': flags |= LEFT; goto repeat;
298 case '+': flags |= PLUS; goto repeat;
299 case ' ': flags |= SPACE; goto repeat;
300 case '#': flags |= SPECIAL; goto repeat;
301 case '0': flags |= ZEROPAD; goto repeat;
304 /* get field width */
307 field_width = skip_atoi(&fmt);
308 else if (*fmt == '*') {
310 /* it's the next argument */
311 field_width = va_arg(args, int);
312 if (field_width < 0) {
313 field_width = -field_width;
318 /* get the precision */
323 precision = skip_atoi(&fmt);
324 else if (*fmt == '*') {
326 /* it's the next argument */
327 precision = va_arg(args, int);
333 /* get the conversion qualifier */
335 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
336 *fmt =='Z' || *fmt == 'z') {
339 if (qualifier == 'l' && *fmt == 'l') {
350 if (!(flags & LEFT)) {
351 while (--field_width > 0) {
357 c = (unsigned char) va_arg(args, int);
361 while (--field_width > 0) {
369 s = va_arg(args, char *);
370 if ((unsigned long)s < PAGE_SIZE)
373 len = strnlen(s, precision);
375 if (!(flags & LEFT)) {
376 while (len < field_width--) {
382 for (i = 0; i < len; ++i) {
387 while (len < field_width--) {
395 if (field_width == -1) {
396 field_width = 2*sizeof(void *);
399 str = number(str, end,
400 (unsigned long) va_arg(args, void *),
401 16, field_width, precision, flags);
407 * What does C99 say about the overflow case here? */
408 if (qualifier == 'l') {
409 long * ip = va_arg(args, long *);
411 } else if (qualifier == 'Z' || qualifier == 'z') {
412 size_t * ip = va_arg(args, size_t *);
415 int * ip = va_arg(args, int *);
426 /* integer number formats - set up the flags and "break" */
456 if (qualifier == 'L')
457 num = va_arg(args, long long);
458 else if (qualifier == 'l') {
459 num = va_arg(args, unsigned long);
461 num = (signed long) num;
462 } else if (qualifier == 'Z' || qualifier == 'z') {
463 num = va_arg(args, size_t);
464 } else if (qualifier == 'h') {
465 num = (unsigned short) va_arg(args, int);
467 num = (signed short) num;
469 num = va_arg(args, unsigned int);
471 num = (signed int) num;
473 str = number(str, end, num, base,
474 field_width, precision, flags);
479 /* don't write out a null byte if the buf size is zero */
481 /* the trailing null byte doesn't count towards the total
487 EXPORT_SYMBOL(vsnprintf);
490 * vscnprintf - Format a string and place it in a buffer
491 * @buf: The buffer to place the result into
492 * @size: The size of the buffer, including the trailing null space
493 * @fmt: The format string to use
494 * @args: Arguments for the format string
496 * The return value is the number of characters which have been written into
497 * the @buf not including the trailing '\0'. If @size is <= 0 the function
500 * Call this function if you are already dealing with a va_list.
501 * You probably want scnprintf instead.
503 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
507 i=vsnprintf(buf,size,fmt,args);
508 return (i >= size) ? (size - 1) : i;
511 EXPORT_SYMBOL(vscnprintf);
514 * snprintf - Format a string and place it in a buffer
515 * @buf: The buffer to place the result into
516 * @size: The size of the buffer, including the trailing null space
517 * @fmt: The format string to use
518 * @...: Arguments for the format string
520 * The return value is the number of characters which would be
521 * generated for the given input, excluding the trailing null,
522 * as per ISO C99. If the return is greater than or equal to
523 * @size, the resulting string is truncated.
525 int snprintf(char * buf, size_t size, const char *fmt, ...)
531 i=vsnprintf(buf,size,fmt,args);
536 EXPORT_SYMBOL(snprintf);
539 * scnprintf - Format a string and place it in a buffer
540 * @buf: The buffer to place the result into
541 * @size: The size of the buffer, including the trailing null space
542 * @fmt: The format string to use
543 * @...: Arguments for the format string
545 * The return value is the number of characters written into @buf not including
546 * the trailing '\0'. If @size is <= 0 the function returns 0. If the return is
547 * greater than or equal to @size, the resulting string is truncated.
550 int scnprintf(char * buf, size_t size, const char *fmt, ...)
556 i = vsnprintf(buf, size, fmt, args);
558 return (i >= size) ? (size - 1) : i;
560 EXPORT_SYMBOL(scnprintf);
563 * vsprintf - Format a string and place it in a buffer
564 * @buf: The buffer to place the result into
565 * @fmt: The format string to use
566 * @args: Arguments for the format string
568 * The function returns the number of characters written
569 * into @buf. Use vsnprintf or vscnprintf in order to avoid
572 * Call this function if you are already dealing with a va_list.
573 * You probably want sprintf instead.
575 int vsprintf(char *buf, const char *fmt, va_list args)
577 return vsnprintf(buf, (~0U)>>1, fmt, args);
580 EXPORT_SYMBOL(vsprintf);
583 * sprintf - Format a string and place it in a buffer
584 * @buf: The buffer to place the result into
585 * @fmt: The format string to use
586 * @...: Arguments for the format string
588 * The function returns the number of characters written
589 * into @buf. Use snprintf or scnprintf in order to avoid
592 int sprintf(char * buf, const char *fmt, ...)
598 i=vsprintf(buf,fmt,args);
603 EXPORT_SYMBOL(sprintf);
606 * vsscanf - Unformat a buffer into a list of arguments
608 * @fmt: format of buffer
611 int vsscanf(const char * buf, const char * fmt, va_list args)
613 const char *str = buf;
622 while(*fmt && *str) {
623 /* skip any white space in format */
624 /* white space in format matchs any amount of
625 * white space, including none, in the input.
628 while (isspace(*fmt))
630 while (isspace(*str))
634 /* anything that is not a conversion must match exactly */
635 if (*fmt != '%' && *fmt) {
636 if (*fmt++ != *str++)
645 /* skip this conversion.
646 * advance both strings to next white space
649 while (!isspace(*fmt) && *fmt)
651 while (!isspace(*str) && *str)
656 /* get field width */
659 field_width = skip_atoi(&fmt);
661 /* get conversion qualifier */
663 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
664 *fmt == 'Z' || *fmt == 'z') {
677 char *s = (char *) va_arg(args,char*);
678 if (field_width == -1)
682 } while (--field_width > 0 && *str);
688 char *s = (char *) va_arg(args, char *);
689 if(field_width == -1)
690 field_width = INT_MAX;
691 /* first, skip leading white space in buffer */
692 while (isspace(*str))
695 /* now copy until next white space */
696 while (*str && !isspace(*str) && field_width--) {
704 /* return number of characters read so far */
706 int *i = (int *)va_arg(args,int*);
724 /* looking for '%' in str */
729 /* invalid format; stop here */
733 /* have some sort of integer conversion.
734 * first, skip white space in buffer.
736 while (isspace(*str))
740 if (is_sign && digit == '-')
744 || (base == 16 && !isxdigit(digit))
745 || (base == 10 && !isdigit(digit))
746 || (base == 8 && (!isdigit(digit) || digit > '7'))
747 || (base == 0 && !isdigit(digit)))
753 short *s = (short *) va_arg(args,short *);
754 *s = (short) simple_strtol(str,&next,base);
756 unsigned short *s = (unsigned short *) va_arg(args, unsigned short *);
757 *s = (unsigned short) simple_strtoul(str, &next, base);
762 long *l = (long *) va_arg(args,long *);
763 *l = simple_strtol(str,&next,base);
765 unsigned long *l = (unsigned long*) va_arg(args,unsigned long*);
766 *l = simple_strtoul(str,&next,base);
771 long long *l = (long long*) va_arg(args,long long *);
772 *l = simple_strtoll(str,&next,base);
774 unsigned long long *l = (unsigned long long*) va_arg(args,unsigned long long*);
775 *l = simple_strtoull(str,&next,base);
781 size_t *s = (size_t*) va_arg(args,size_t*);
782 *s = (size_t) simple_strtoul(str,&next,base);
787 int *i = (int *) va_arg(args, int*);
788 *i = (int) simple_strtol(str,&next,base);
790 unsigned int *i = (unsigned int*) va_arg(args, unsigned int*);
791 *i = (unsigned int) simple_strtoul(str,&next,base);
804 EXPORT_SYMBOL(vsscanf);
807 * sscanf - Unformat a buffer into a list of arguments
809 * @fmt: formatting of buffer
810 * @...: resulting arguments
812 int sscanf(const char * buf, const char * fmt, ...)
818 i = vsscanf(buf,fmt,args);
823 EXPORT_SYMBOL(sscanf);