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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - lib/vsprintf.c
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/page.h> /* for PAGE_SIZE */
27 #include <asm/div64.h>
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
35 unsigned long simple_strtoul(const char *cp
,char **endp
,unsigned int base
)
37 unsigned long result
= 0,value
;
44 if ((toupper(*cp
) == 'X') && isxdigit(cp
[1])) {
49 } else if (base
== 16) {
50 if (cp
[0] == '0' && toupper(cp
[1]) == 'X')
53 while (isxdigit(*cp
) &&
54 (value
= isdigit(*cp
) ? *cp
-'0' : toupper(*cp
)-'A'+10) < base
) {
55 result
= result
*base
+ value
;
63 EXPORT_SYMBOL(simple_strtoul
);
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
71 long simple_strtol(const char *cp
,char **endp
,unsigned int base
)
74 return -simple_strtoul(cp
+1,endp
,base
);
75 return simple_strtoul(cp
,endp
,base
);
78 EXPORT_SYMBOL(simple_strtol
);
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
86 unsigned long long simple_strtoull(const char *cp
,char **endp
,unsigned int base
)
88 unsigned long long result
= 0,value
;
95 if ((toupper(*cp
) == 'X') && isxdigit(cp
[1])) {
100 } else if (base
== 16) {
101 if (cp
[0] == '0' && toupper(cp
[1]) == 'X')
104 while (isxdigit(*cp
) && (value
= isdigit(*cp
) ? *cp
-'0' : (islower(*cp
)
105 ? toupper(*cp
) : *cp
)-'A'+10) < base
) {
106 result
= result
*base
+ value
;
114 EXPORT_SYMBOL(simple_strtoull
);
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
122 long long simple_strtoll(const char *cp
,char **endp
,unsigned int base
)
125 return -simple_strtoull(cp
+1,endp
,base
);
126 return simple_strtoull(cp
,endp
,base
);
129 static int skip_atoi(const char **s
)
134 i
= i
*10 + *((*s
)++) - '0';
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' */
146 static char *number(char *buf
, char *end
, unsigned long long num
, int base
, int size
, int precision
, int type
)
150 /* we are called with base 8, 10 or 16, only, thus don't need "g..." */
151 static const char small_digits
[] = "0123456789abcdefx"; /* "ghijklmnopqrstuvwxyz"; */
152 static const char large_digits
[] = "0123456789ABCDEFX"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
153 int need_pfx
= ((type
& SPECIAL
) && base
!= 10);
156 digits
= (type
& LARGE
) ? large_digits
: small_digits
;
159 if (base
< 2 || base
> 36)
163 if ((signed long long) num
< 0) {
165 num
= - (signed long long) num
;
167 } else if (type
& PLUS
) {
170 } else if (type
& SPACE
) {
181 /* generate full string in tmp[], in reverse order */
185 else if (base
!= 10) { /* 8 or 16 */
188 if (base
== 16) shift
= 4;
190 tmp
[i
++] = digits
[((unsigned char)num
) & mask
];
193 } else do { /* generic code, works for any base */
194 tmp
[i
++] = digits
[do_div(num
,10 /*base*/)];
197 /* printing 100 using %2d gives "100", not "00" */
200 /* leading space padding */
202 if (!(type
& (ZEROPAD
+LEFT
))) {
215 /* "0x" / "0" prefix */
222 *buf
= digits
[16]; /* for arbitrary base: digits[33]; */
226 /* zero or space padding */
227 if (!(type
& LEFT
)) {
228 char c
= (type
& ZEROPAD
) ? '0' : ' ';
229 while (--size
>= 0) {
235 /* hmm even more zero padding? */
236 while (i
<= --precision
) {
241 /* actual digits of result */
247 /* trailing space padding */
248 while (--size
>= 0) {
257 * vsnprintf - Format a string and place it in a buffer
258 * @buf: The buffer to place the result into
259 * @size: The size of the buffer, including the trailing null space
260 * @fmt: The format string to use
261 * @args: Arguments for the format string
263 * The return value is the number of characters which would
264 * be generated for the given input, excluding the trailing
265 * '\0', as per ISO C99. If you want to have the exact
266 * number of characters written into @buf as return value
267 * (not including the trailing '\0'), use vscnprintf(). If the
268 * return is greater than or equal to @size, the resulting
269 * string is truncated.
271 * Call this function if you are already dealing with a va_list.
272 * You probably want snprintf() instead.
274 int vsnprintf(char *buf
, size_t size
, const char *fmt
, va_list args
)
277 unsigned long long num
;
282 int flags
; /* flags to number() */
284 int field_width
; /* width of output field */
285 int precision
; /* min. # of digits for integers; max
286 number of chars for from string */
287 int qualifier
; /* 'h', 'l', or 'L' for integer fields */
288 /* 'z' support added 23/7/1999 S.H. */
289 /* 'z' changed to 'Z' --davidm 1/25/99 */
290 /* 't' added for ptrdiff_t */
292 /* Reject out-of-range values early. Large positive sizes are
293 used for unknown buffer sizes. */
294 if (unlikely((int) size
< 0)) {
295 /* There can be only one.. */
296 static char warn
= 1;
305 /* Make sure end is always >= buf */
311 for (; *fmt
; ++fmt
) {
322 ++fmt
; /* this also skips first '%' */
324 case '-': flags
|= LEFT
; goto repeat
;
325 case '+': flags
|= PLUS
; goto repeat
;
326 case ' ': flags
|= SPACE
; goto repeat
;
327 case '#': flags
|= SPECIAL
; goto repeat
;
328 case '0': flags
|= ZEROPAD
; goto repeat
;
331 /* get field width */
334 field_width
= skip_atoi(&fmt
);
335 else if (*fmt
== '*') {
337 /* it's the next argument */
338 field_width
= va_arg(args
, int);
339 if (field_width
< 0) {
340 field_width
= -field_width
;
345 /* get the precision */
350 precision
= skip_atoi(&fmt
);
351 else if (*fmt
== '*') {
353 /* it's the next argument */
354 precision
= va_arg(args
, int);
360 /* get the conversion qualifier */
362 if (*fmt
== 'h' || *fmt
== 'l' || *fmt
== 'L' ||
363 *fmt
=='Z' || *fmt
== 'z' || *fmt
== 't') {
366 if (qualifier
== 'l' && *fmt
== 'l') {
377 if (!(flags
& LEFT
)) {
378 while (--field_width
> 0) {
384 c
= (unsigned char) va_arg(args
, int);
388 while (--field_width
> 0) {
396 s
= va_arg(args
, char *);
397 if ((unsigned long)s
< PAGE_SIZE
)
400 len
= strnlen(s
, precision
);
402 if (!(flags
& LEFT
)) {
403 while (len
< field_width
--) {
409 for (i
= 0; i
< len
; ++i
) {
414 while (len
< field_width
--) {
422 if (field_width
== -1) {
423 field_width
= 2*sizeof(void *);
426 str
= number(str
, end
,
427 (unsigned long) va_arg(args
, void *),
428 16, field_width
, precision
, flags
);
434 * What does C99 say about the overflow case here? */
435 if (qualifier
== 'l') {
436 long * ip
= va_arg(args
, long *);
438 } else if (qualifier
== 'Z' || qualifier
== 'z') {
439 size_t * ip
= va_arg(args
, size_t *);
442 int * ip
= va_arg(args
, int *);
453 /* integer number formats - set up the flags and "break" */
483 if (qualifier
== 'L')
484 num
= va_arg(args
, long long);
485 else if (qualifier
== 'l') {
486 num
= va_arg(args
, unsigned long);
488 num
= (signed long) num
;
489 } else if (qualifier
== 'Z' || qualifier
== 'z') {
490 num
= va_arg(args
, size_t);
491 } else if (qualifier
== 't') {
492 num
= va_arg(args
, ptrdiff_t);
493 } else if (qualifier
== 'h') {
494 num
= (unsigned short) va_arg(args
, int);
496 num
= (signed short) num
;
498 num
= va_arg(args
, unsigned int);
500 num
= (signed int) num
;
502 str
= number(str
, end
, num
, base
,
503 field_width
, precision
, flags
);
511 /* the trailing null byte doesn't count towards the total */
515 EXPORT_SYMBOL(vsnprintf
);
518 * vscnprintf - Format a string and place it in a buffer
519 * @buf: The buffer to place the result into
520 * @size: The size of the buffer, including the trailing null space
521 * @fmt: The format string to use
522 * @args: Arguments for the format string
524 * The return value is the number of characters which have been written into
525 * the @buf not including the trailing '\0'. If @size is <= 0 the function
528 * Call this function if you are already dealing with a va_list.
529 * You probably want scnprintf() instead.
531 int vscnprintf(char *buf
, size_t size
, const char *fmt
, va_list args
)
535 i
=vsnprintf(buf
,size
,fmt
,args
);
536 return (i
>= size
) ? (size
- 1) : i
;
539 EXPORT_SYMBOL(vscnprintf
);
542 * snprintf - Format a string and place it in a buffer
543 * @buf: The buffer to place the result into
544 * @size: The size of the buffer, including the trailing null space
545 * @fmt: The format string to use
546 * @...: Arguments for the format string
548 * The return value is the number of characters which would be
549 * generated for the given input, excluding the trailing null,
550 * as per ISO C99. If the return is greater than or equal to
551 * @size, the resulting string is truncated.
553 int snprintf(char * buf
, size_t size
, const char *fmt
, ...)
559 i
=vsnprintf(buf
,size
,fmt
,args
);
564 EXPORT_SYMBOL(snprintf
);
567 * scnprintf - Format a string and place it in a buffer
568 * @buf: The buffer to place the result into
569 * @size: The size of the buffer, including the trailing null space
570 * @fmt: The format string to use
571 * @...: Arguments for the format string
573 * The return value is the number of characters written into @buf not including
574 * the trailing '\0'. If @size is <= 0 the function returns 0.
577 int scnprintf(char * buf
, size_t size
, const char *fmt
, ...)
583 i
= vsnprintf(buf
, size
, fmt
, args
);
585 return (i
>= size
) ? (size
- 1) : i
;
587 EXPORT_SYMBOL(scnprintf
);
590 * vsprintf - Format a string and place it in a buffer
591 * @buf: The buffer to place the result into
592 * @fmt: The format string to use
593 * @args: Arguments for the format string
595 * The function returns the number of characters written
596 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
599 * Call this function if you are already dealing with a va_list.
600 * You probably want sprintf() instead.
602 int vsprintf(char *buf
, const char *fmt
, va_list args
)
604 return vsnprintf(buf
, INT_MAX
, fmt
, args
);
607 EXPORT_SYMBOL(vsprintf
);
610 * sprintf - Format a string and place it in a buffer
611 * @buf: The buffer to place the result into
612 * @fmt: The format string to use
613 * @...: Arguments for the format string
615 * The function returns the number of characters written
616 * into @buf. Use snprintf() or scnprintf() in order to avoid
619 int sprintf(char * buf
, const char *fmt
, ...)
625 i
=vsnprintf(buf
, INT_MAX
, fmt
, args
);
630 EXPORT_SYMBOL(sprintf
);
633 * vsscanf - Unformat a buffer into a list of arguments
635 * @fmt: format of buffer
638 int vsscanf(const char * buf
, const char * fmt
, va_list args
)
640 const char *str
= buf
;
649 while(*fmt
&& *str
) {
650 /* skip any white space in format */
651 /* white space in format matchs any amount of
652 * white space, including none, in the input.
655 while (isspace(*fmt
))
657 while (isspace(*str
))
661 /* anything that is not a conversion must match exactly */
662 if (*fmt
!= '%' && *fmt
) {
663 if (*fmt
++ != *str
++)
672 /* skip this conversion.
673 * advance both strings to next white space
676 while (!isspace(*fmt
) && *fmt
)
678 while (!isspace(*str
) && *str
)
683 /* get field width */
686 field_width
= skip_atoi(&fmt
);
688 /* get conversion qualifier */
690 if (*fmt
== 'h' || *fmt
== 'l' || *fmt
== 'L' ||
691 *fmt
== 'Z' || *fmt
== 'z') {
693 if (unlikely(qualifier
== *fmt
)) {
694 if (qualifier
== 'h') {
697 } else if (qualifier
== 'l') {
712 char *s
= (char *) va_arg(args
,char*);
713 if (field_width
== -1)
717 } while (--field_width
> 0 && *str
);
723 char *s
= (char *) va_arg(args
, char *);
724 if(field_width
== -1)
725 field_width
= INT_MAX
;
726 /* first, skip leading white space in buffer */
727 while (isspace(*str
))
730 /* now copy until next white space */
731 while (*str
&& !isspace(*str
) && field_width
--) {
739 /* return number of characters read so far */
741 int *i
= (int *)va_arg(args
,int*);
759 /* looking for '%' in str */
764 /* invalid format; stop here */
768 /* have some sort of integer conversion.
769 * first, skip white space in buffer.
771 while (isspace(*str
))
775 if (is_sign
&& digit
== '-')
779 || (base
== 16 && !isxdigit(digit
))
780 || (base
== 10 && !isdigit(digit
))
781 || (base
== 8 && (!isdigit(digit
) || digit
> '7'))
782 || (base
== 0 && !isdigit(digit
)))
786 case 'H': /* that's 'hh' in format */
788 signed char *s
= (signed char *) va_arg(args
,signed char *);
789 *s
= (signed char) simple_strtol(str
,&next
,base
);
791 unsigned char *s
= (unsigned char *) va_arg(args
, unsigned char *);
792 *s
= (unsigned char) simple_strtoul(str
, &next
, base
);
797 short *s
= (short *) va_arg(args
,short *);
798 *s
= (short) simple_strtol(str
,&next
,base
);
800 unsigned short *s
= (unsigned short *) va_arg(args
, unsigned short *);
801 *s
= (unsigned short) simple_strtoul(str
, &next
, base
);
806 long *l
= (long *) va_arg(args
,long *);
807 *l
= simple_strtol(str
,&next
,base
);
809 unsigned long *l
= (unsigned long*) va_arg(args
,unsigned long*);
810 *l
= simple_strtoul(str
,&next
,base
);
815 long long *l
= (long long*) va_arg(args
,long long *);
816 *l
= simple_strtoll(str
,&next
,base
);
818 unsigned long long *l
= (unsigned long long*) va_arg(args
,unsigned long long*);
819 *l
= simple_strtoull(str
,&next
,base
);
825 size_t *s
= (size_t*) va_arg(args
,size_t*);
826 *s
= (size_t) simple_strtoul(str
,&next
,base
);
831 int *i
= (int *) va_arg(args
, int*);
832 *i
= (int) simple_strtol(str
,&next
,base
);
834 unsigned int *i
= (unsigned int*) va_arg(args
, unsigned int*);
835 *i
= (unsigned int) simple_strtoul(str
,&next
,base
);
847 * Now we've come all the way through so either the input string or the
848 * format ended. In the former case, there can be a %n at the current
849 * position in the format that needs to be filled.
851 if (*fmt
== '%' && *(fmt
+ 1) == 'n') {
852 int *p
= (int *)va_arg(args
, int *);
859 EXPORT_SYMBOL(vsscanf
);
862 * sscanf - Unformat a buffer into a list of arguments
864 * @fmt: formatting of buffer
865 * @...: resulting arguments
867 int sscanf(const char * buf
, const char * fmt
, ...)
873 i
= vsscanf(buf
,fmt
,args
);
878 EXPORT_SYMBOL(sscanf
);
881 /* Simplified asprintf. */
882 char *kvasprintf(gfp_t gfp
, const char *fmt
, va_list ap
)
889 len
= vsnprintf(NULL
, 0, fmt
, aq
);
892 p
= kmalloc(len
+1, gfp
);
896 vsnprintf(p
, len
+1, fmt
, ap
);
900 EXPORT_SYMBOL(kvasprintf
);
902 char *kasprintf(gfp_t gfp
, const char *fmt
, ...)
908 p
= kvasprintf(gfp
, fmt
, ap
);
913 EXPORT_SYMBOL(kasprintf
);