aboutsummaryrefslogtreecommitdiffstats
path: root/lib/vsprintf.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/vsprintf.c')
-rw-r--r--lib/vsprintf.c846
1 files changed, 846 insertions, 0 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
new file mode 100644
index 000000000000..a9bda0a361f3
--- /dev/null
+++ b/lib/vsprintf.c
@@ -0,0 +1,846 @@
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/div64.h>
27
28/**
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
33 */
34unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base)
35{
36 unsigned long result = 0,value;
37
38 if (!base) {
39 base = 10;
40 if (*cp == '0') {
41 base = 8;
42 cp++;
43 if ((toupper(*cp) == 'X') && isxdigit(cp[1])) {
44 cp++;
45 base = 16;
46 }
47 }
48 } else if (base == 16) {
49 if (cp[0] == '0' && toupper(cp[1]) == 'X')
50 cp += 2;
51 }
52 while (isxdigit(*cp) &&
53 (value = isdigit(*cp) ? *cp-'0' : toupper(*cp)-'A'+10) < base) {
54 result = result*base + value;
55 cp++;
56 }
57 if (endp)
58 *endp = (char *)cp;
59 return result;
60}
61
62EXPORT_SYMBOL(simple_strtoul);
63
64/**
65 * simple_strtol - convert a string to a signed long
66 * @cp: The start of the string
67 * @endp: A pointer to the end of the parsed string will be placed here
68 * @base: The number base to use
69 */
70long simple_strtol(const char *cp,char **endp,unsigned int base)
71{
72 if(*cp=='-')
73 return -simple_strtoul(cp+1,endp,base);
74 return simple_strtoul(cp,endp,base);
75}
76
77EXPORT_SYMBOL(simple_strtol);
78
79/**
80 * simple_strtoull - convert a string to an unsigned long long
81 * @cp: The start of the string
82 * @endp: A pointer to the end of the parsed string will be placed here
83 * @base: The number base to use
84 */
85unsigned long long simple_strtoull(const char *cp,char **endp,unsigned int base)
86{
87 unsigned long long result = 0,value;
88
89 if (!base) {
90 base = 10;
91 if (*cp == '0') {
92 base = 8;
93 cp++;
94 if ((toupper(*cp) == 'X') && isxdigit(cp[1])) {
95 cp++;
96 base = 16;
97 }
98 }
99 } else if (base == 16) {
100 if (cp[0] == '0' && toupper(cp[1]) == 'X')
101 cp += 2;
102 }
103 while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
104 ? toupper(*cp) : *cp)-'A'+10) < base) {
105 result = result*base + value;
106 cp++;
107 }
108 if (endp)
109 *endp = (char *)cp;
110 return result;
111}
112
113EXPORT_SYMBOL(simple_strtoull);
114
115/**
116 * simple_strtoll - convert a string to a signed long long
117 * @cp: The start of the string
118 * @endp: A pointer to the end of the parsed string will be placed here
119 * @base: The number base to use
120 */
121long long simple_strtoll(const char *cp,char **endp,unsigned int base)
122{
123 if(*cp=='-')
124 return -simple_strtoull(cp+1,endp,base);
125 return simple_strtoull(cp,endp,base);
126}
127
128static int skip_atoi(const char **s)
129{
130 int i=0;
131
132 while (isdigit(**s))
133 i = i*10 + *((*s)++) - '0';
134 return i;
135}
136
137#define ZEROPAD 1 /* pad with zero */
138#define SIGN 2 /* unsigned/signed long */
139#define PLUS 4 /* show plus */
140#define SPACE 8 /* space if plus */
141#define LEFT 16 /* left justified */
142#define SPECIAL 32 /* 0x */
143#define LARGE 64 /* use 'ABCDEF' instead of 'abcdef' */
144
145static char * number(char * buf, char * end, unsigned long long num, int base, int size, int precision, int type)
146{
147 char c,sign,tmp[66];
148 const char *digits;
149 static const char small_digits[] = "0123456789abcdefghijklmnopqrstuvwxyz";
150 static const char large_digits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
151 int i;
152
153 digits = (type & LARGE) ? large_digits : small_digits;
154 if (type & LEFT)
155 type &= ~ZEROPAD;
156 if (base < 2 || base > 36)
157 return NULL;
158 c = (type & ZEROPAD) ? '0' : ' ';
159 sign = 0;
160 if (type & SIGN) {
161 if ((signed long long) num < 0) {
162 sign = '-';
163 num = - (signed long long) num;
164 size--;
165 } else if (type & PLUS) {
166 sign = '+';
167 size--;
168 } else if (type & SPACE) {
169 sign = ' ';
170 size--;
171 }
172 }
173 if (type & SPECIAL) {
174 if (base == 16)
175 size -= 2;
176 else if (base == 8)
177 size--;
178 }
179 i = 0;
180 if (num == 0)
181 tmp[i++]='0';
182 else while (num != 0)
183 tmp[i++] = digits[do_div(num,base)];
184 if (i > precision)
185 precision = i;
186 size -= precision;
187 if (!(type&(ZEROPAD+LEFT))) {
188 while(size-->0) {
189 if (buf <= end)
190 *buf = ' ';
191 ++buf;
192 }
193 }
194 if (sign) {
195 if (buf <= end)
196 *buf = sign;
197 ++buf;
198 }
199 if (type & SPECIAL) {
200 if (base==8) {
201 if (buf <= end)
202 *buf = '0';
203 ++buf;
204 } else if (base==16) {
205 if (buf <= end)
206 *buf = '0';
207 ++buf;
208 if (buf <= end)
209 *buf = digits[33];
210 ++buf;
211 }
212 }
213 if (!(type & LEFT)) {
214 while (size-- > 0) {
215 if (buf <= end)
216 *buf = c;
217 ++buf;
218 }
219 }
220 while (i < precision--) {
221 if (buf <= end)
222 *buf = '0';
223 ++buf;
224 }
225 while (i-- > 0) {
226 if (buf <= end)
227 *buf = tmp[i];
228 ++buf;
229 }
230 while (size-- > 0) {
231 if (buf <= end)
232 *buf = ' ';
233 ++buf;
234 }
235 return buf;
236}
237
238/**
239 * vsnprintf - Format a string and place it in a buffer
240 * @buf: The buffer to place the result into
241 * @size: The size of the buffer, including the trailing null space
242 * @fmt: The format string to use
243 * @args: Arguments for the format string
244 *
245 * The return value is the number of characters which would
246 * be generated for the given input, excluding the trailing
247 * '\0', as per ISO C99. If you want to have the exact
248 * number of characters written into @buf as return value
249 * (not including the trailing '\0'), use vscnprintf. If the
250 * return is greater than or equal to @size, the resulting
251 * string is truncated.
252 *
253 * Call this function if you are already dealing with a va_list.
254 * You probably want snprintf instead.
255 */
256int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
257{
258 int len;
259 unsigned long long num;
260 int i, base;
261 char *str, *end, c;
262 const char *s;
263
264 int flags; /* flags to number() */
265
266 int field_width; /* width of output field */
267 int precision; /* min. # of digits for integers; max
268 number of chars for from string */
269 int qualifier; /* 'h', 'l', or 'L' for integer fields */
270 /* 'z' support added 23/7/1999 S.H. */
271 /* 'z' changed to 'Z' --davidm 1/25/99 */
272
273 /* Reject out-of-range values early */
274 if (unlikely((int) size < 0)) {
275 /* There can be only one.. */
276 static int warn = 1;
277 WARN_ON(warn);
278 warn = 0;
279 return 0;
280 }
281
282 str = buf;
283 end = buf + size - 1;
284
285 if (end < buf - 1) {
286 end = ((void *) -1);
287 size = end - buf + 1;
288 }
289
290 for (; *fmt ; ++fmt) {
291 if (*fmt != '%') {
292 if (str <= end)
293 *str = *fmt;
294 ++str;
295 continue;
296 }
297
298 /* process flags */
299 flags = 0;
300 repeat:
301 ++fmt; /* this also skips first '%' */
302 switch (*fmt) {
303 case '-': flags |= LEFT; goto repeat;
304 case '+': flags |= PLUS; goto repeat;
305 case ' ': flags |= SPACE; goto repeat;
306 case '#': flags |= SPECIAL; goto repeat;
307 case '0': flags |= ZEROPAD; goto repeat;
308 }
309
310 /* get field width */
311 field_width = -1;
312 if (isdigit(*fmt))
313 field_width = skip_atoi(&fmt);
314 else if (*fmt == '*') {
315 ++fmt;
316 /* it's the next argument */
317 field_width = va_arg(args, int);
318 if (field_width < 0) {
319 field_width = -field_width;
320 flags |= LEFT;
321 }
322 }
323
324 /* get the precision */
325 precision = -1;
326 if (*fmt == '.') {
327 ++fmt;
328 if (isdigit(*fmt))
329 precision = skip_atoi(&fmt);
330 else if (*fmt == '*') {
331 ++fmt;
332 /* it's the next argument */
333 precision = va_arg(args, int);
334 }
335 if (precision < 0)
336 precision = 0;
337 }
338
339 /* get the conversion qualifier */
340 qualifier = -1;
341 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
342 *fmt =='Z' || *fmt == 'z') {
343 qualifier = *fmt;
344 ++fmt;
345 if (qualifier == 'l' && *fmt == 'l') {
346 qualifier = 'L';
347 ++fmt;
348 }
349 }
350
351 /* default base */
352 base = 10;
353
354 switch (*fmt) {
355 case 'c':
356 if (!(flags & LEFT)) {
357 while (--field_width > 0) {
358 if (str <= end)
359 *str = ' ';
360 ++str;
361 }
362 }
363 c = (unsigned char) va_arg(args, int);
364 if (str <= end)
365 *str = c;
366 ++str;
367 while (--field_width > 0) {
368 if (str <= end)
369 *str = ' ';
370 ++str;
371 }
372 continue;
373
374 case 's':
375 s = va_arg(args, char *);
376 if ((unsigned long)s < PAGE_SIZE)
377 s = "<NULL>";
378
379 len = strnlen(s, precision);
380
381 if (!(flags & LEFT)) {
382 while (len < field_width--) {
383 if (str <= end)
384 *str = ' ';
385 ++str;
386 }
387 }
388 for (i = 0; i < len; ++i) {
389 if (str <= end)
390 *str = *s;
391 ++str; ++s;
392 }
393 while (len < field_width--) {
394 if (str <= end)
395 *str = ' ';
396 ++str;
397 }
398 continue;
399
400 case 'p':
401 if (field_width == -1) {
402 field_width = 2*sizeof(void *);
403 flags |= ZEROPAD;
404 }
405 str = number(str, end,
406 (unsigned long) va_arg(args, void *),
407 16, field_width, precision, flags);
408 continue;
409
410
411 case 'n':
412 /* FIXME:
413 * What does C99 say about the overflow case here? */
414 if (qualifier == 'l') {
415 long * ip = va_arg(args, long *);
416 *ip = (str - buf);
417 } else if (qualifier == 'Z' || qualifier == 'z') {
418 size_t * ip = va_arg(args, size_t *);
419 *ip = (str - buf);
420 } else {
421 int * ip = va_arg(args, int *);
422 *ip = (str - buf);
423 }
424 continue;
425
426 case '%':
427 if (str <= end)
428 *str = '%';
429 ++str;
430 continue;
431
432 /* integer number formats - set up the flags and "break" */
433 case 'o':
434 base = 8;
435 break;
436
437 case 'X':
438 flags |= LARGE;
439 case 'x':
440 base = 16;
441 break;
442
443 case 'd':
444 case 'i':
445 flags |= SIGN;
446 case 'u':
447 break;
448
449 default:
450 if (str <= end)
451 *str = '%';
452 ++str;
453 if (*fmt) {
454 if (str <= end)
455 *str = *fmt;
456 ++str;
457 } else {
458 --fmt;
459 }
460 continue;
461 }
462 if (qualifier == 'L')
463 num = va_arg(args, long long);
464 else if (qualifier == 'l') {
465 num = va_arg(args, unsigned long);
466 if (flags & SIGN)
467 num = (signed long) num;
468 } else if (qualifier == 'Z' || qualifier == 'z') {
469 num = va_arg(args, size_t);
470 } else if (qualifier == 'h') {
471 num = (unsigned short) va_arg(args, int);
472 if (flags & SIGN)
473 num = (signed short) num;
474 } else {
475 num = va_arg(args, unsigned int);
476 if (flags & SIGN)
477 num = (signed int) num;
478 }
479 str = number(str, end, num, base,
480 field_width, precision, flags);
481 }
482 if (str <= end)
483 *str = '\0';
484 else if (size > 0)
485 /* don't write out a null byte if the buf size is zero */
486 *end = '\0';
487 /* the trailing null byte doesn't count towards the total
488 * ++str;
489 */
490 return str-buf;
491}
492
493EXPORT_SYMBOL(vsnprintf);
494
495/**
496 * vscnprintf - Format a string and place it in a buffer
497 * @buf: The buffer to place the result into
498 * @size: The size of the buffer, including the trailing null space
499 * @fmt: The format string to use
500 * @args: Arguments for the format string
501 *
502 * The return value is the number of characters which have been written into
503 * the @buf not including the trailing '\0'. If @size is <= 0 the function
504 * returns 0.
505 *
506 * Call this function if you are already dealing with a va_list.
507 * You probably want scnprintf instead.
508 */
509int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
510{
511 int i;
512
513 i=vsnprintf(buf,size,fmt,args);
514 return (i >= size) ? (size - 1) : i;
515}
516
517EXPORT_SYMBOL(vscnprintf);
518
519/**
520 * snprintf - Format a string and place it in a buffer
521 * @buf: The buffer to place the result into
522 * @size: The size of the buffer, including the trailing null space
523 * @fmt: The format string to use
524 * @...: Arguments for the format string
525 *
526 * The return value is the number of characters which would be
527 * generated for the given input, excluding the trailing null,
528 * as per ISO C99. If the return is greater than or equal to
529 * @size, the resulting string is truncated.
530 */
531int snprintf(char * buf, size_t size, const char *fmt, ...)
532{
533 va_list args;
534 int i;
535
536 va_start(args, fmt);
537 i=vsnprintf(buf,size,fmt,args);
538 va_end(args);
539 return i;
540}
541
542EXPORT_SYMBOL(snprintf);
543
544/**
545 * scnprintf - Format a string and place it in a buffer
546 * @buf: The buffer to place the result into
547 * @size: The size of the buffer, including the trailing null space
548 * @fmt: The format string to use
549 * @...: Arguments for the format string
550 *
551 * The return value is the number of characters written into @buf not including
552 * the trailing '\0'. If @size is <= 0 the function returns 0. If the return is
553 * greater than or equal to @size, the resulting string is truncated.
554 */
555
556int scnprintf(char * buf, size_t size, const char *fmt, ...)
557{
558 va_list args;
559 int i;
560
561 va_start(args, fmt);
562 i = vsnprintf(buf, size, fmt, args);
563 va_end(args);
564 return (i >= size) ? (size - 1) : i;
565}
566EXPORT_SYMBOL(scnprintf);
567
568/**
569 * vsprintf - Format a string and place it in a buffer
570 * @buf: The buffer to place the result into
571 * @fmt: The format string to use
572 * @args: Arguments for the format string
573 *
574 * The function returns the number of characters written
575 * into @buf. Use vsnprintf or vscnprintf in order to avoid
576 * buffer overflows.
577 *
578 * Call this function if you are already dealing with a va_list.
579 * You probably want sprintf instead.
580 */
581int vsprintf(char *buf, const char *fmt, va_list args)
582{
583 return vsnprintf(buf, INT_MAX, fmt, args);
584}
585
586EXPORT_SYMBOL(vsprintf);
587
588/**
589 * sprintf - Format a string and place it in a buffer
590 * @buf: The buffer to place the result into
591 * @fmt: The format string to use
592 * @...: Arguments for the format string
593 *
594 * The function returns the number of characters written
595 * into @buf. Use snprintf or scnprintf in order to avoid
596 * buffer overflows.
597 */
598int sprintf(char * buf, const char *fmt, ...)
599{
600 va_list args;
601 int i;
602
603 va_start(args, fmt);
604 i=vsnprintf(buf, INT_MAX, fmt, args);
605 va_end(args);
606 return i;
607}
608
609EXPORT_SYMBOL(sprintf);
610
611/**
612 * vsscanf - Unformat a buffer into a list of arguments
613 * @buf: input buffer
614 * @fmt: format of buffer
615 * @args: arguments
616 */
617int vsscanf(const char * buf, const char * fmt, va_list args)
618{
619 const char *str = buf;
620 char *next;
621 char digit;
622 int num = 0;
623 int qualifier;
624 int base;
625 int field_width;
626 int is_sign = 0;
627
628 while(*fmt && *str) {
629 /* skip any white space in format */
630 /* white space in format matchs any amount of
631 * white space, including none, in the input.
632 */
633 if (isspace(*fmt)) {
634 while (isspace(*fmt))
635 ++fmt;
636 while (isspace(*str))
637 ++str;
638 }
639
640 /* anything that is not a conversion must match exactly */
641 if (*fmt != '%' && *fmt) {
642 if (*fmt++ != *str++)
643 break;
644 continue;
645 }
646
647 if (!*fmt)
648 break;
649 ++fmt;
650
651 /* skip this conversion.
652 * advance both strings to next white space
653 */
654 if (*fmt == '*') {
655 while (!isspace(*fmt) && *fmt)
656 fmt++;
657 while (!isspace(*str) && *str)
658 str++;
659 continue;
660 }
661
662 /* get field width */
663 field_width = -1;
664 if (isdigit(*fmt))
665 field_width = skip_atoi(&fmt);
666
667 /* get conversion qualifier */
668 qualifier = -1;
669 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
670 *fmt == 'Z' || *fmt == 'z') {
671 qualifier = *fmt++;
672 if (unlikely(qualifier == *fmt)) {
673 if (qualifier == 'h') {
674 qualifier = 'H';
675 fmt++;
676 } else if (qualifier == 'l') {
677 qualifier = 'L';
678 fmt++;
679 }
680 }
681 }
682 base = 10;
683 is_sign = 0;
684
685 if (!*fmt || !*str)
686 break;
687
688 switch(*fmt++) {
689 case 'c':
690 {
691 char *s = (char *) va_arg(args,char*);
692 if (field_width == -1)
693 field_width = 1;
694 do {
695 *s++ = *str++;
696 } while (--field_width > 0 && *str);
697 num++;
698 }
699 continue;
700 case 's':
701 {
702 char *s = (char *) va_arg(args, char *);
703 if(field_width == -1)
704 field_width = INT_MAX;
705 /* first, skip leading white space in buffer */
706 while (isspace(*str))
707 str++;
708
709 /* now copy until next white space */
710 while (*str && !isspace(*str) && field_width--) {
711 *s++ = *str++;
712 }
713 *s = '\0';
714 num++;
715 }
716 continue;
717 case 'n':
718 /* return number of characters read so far */
719 {
720 int *i = (int *)va_arg(args,int*);
721 *i = str - buf;
722 }
723 continue;
724 case 'o':
725 base = 8;
726 break;
727 case 'x':
728 case 'X':
729 base = 16;
730 break;
731 case 'i':
732 base = 0;
733 case 'd':
734 is_sign = 1;
735 case 'u':
736 break;
737 case '%':
738 /* looking for '%' in str */
739 if (*str++ != '%')
740 return num;
741 continue;
742 default:
743 /* invalid format; stop here */
744 return num;
745 }
746
747 /* have some sort of integer conversion.
748 * first, skip white space in buffer.
749 */
750 while (isspace(*str))
751 str++;
752
753 digit = *str;
754 if (is_sign && digit == '-')
755 digit = *(str + 1);
756
757 if (!digit
758 || (base == 16 && !isxdigit(digit))
759 || (base == 10 && !isdigit(digit))
760 || (base == 8 && (!isdigit(digit) || digit > '7'))
761 || (base == 0 && !isdigit(digit)))
762 break;
763
764 switch(qualifier) {
765 case 'H': /* that's 'hh' in format */
766 if (is_sign) {
767 signed char *s = (signed char *) va_arg(args,signed char *);
768 *s = (signed char) simple_strtol(str,&next,base);
769 } else {
770 unsigned char *s = (unsigned char *) va_arg(args, unsigned char *);
771 *s = (unsigned char) simple_strtoul(str, &next, base);
772 }
773 break;
774 case 'h':
775 if (is_sign) {
776 short *s = (short *) va_arg(args,short *);
777 *s = (short) simple_strtol(str,&next,base);
778 } else {
779 unsigned short *s = (unsigned short *) va_arg(args, unsigned short *);
780 *s = (unsigned short) simple_strtoul(str, &next, base);
781 }
782 break;
783 case 'l':
784 if (is_sign) {
785 long *l = (long *) va_arg(args,long *);
786 *l = simple_strtol(str,&next,base);
787 } else {
788 unsigned long *l = (unsigned long*) va_arg(args,unsigned long*);
789 *l = simple_strtoul(str,&next,base);
790 }
791 break;
792 case 'L':
793 if (is_sign) {
794 long long *l = (long long*) va_arg(args,long long *);
795 *l = simple_strtoll(str,&next,base);
796 } else {
797 unsigned long long *l = (unsigned long long*) va_arg(args,unsigned long long*);
798 *l = simple_strtoull(str,&next,base);
799 }
800 break;
801 case 'Z':
802 case 'z':
803 {
804 size_t *s = (size_t*) va_arg(args,size_t*);
805 *s = (size_t) simple_strtoul(str,&next,base);
806 }
807 break;
808 default:
809 if (is_sign) {
810 int *i = (int *) va_arg(args, int*);
811 *i = (int) simple_strtol(str,&next,base);
812 } else {
813 unsigned int *i = (unsigned int*) va_arg(args, unsigned int*);
814 *i = (unsigned int) simple_strtoul(str,&next,base);
815 }
816 break;
817 }
818 num++;
819
820 if (!next)
821 break;
822 str = next;
823 }
824 return num;
825}
826
827EXPORT_SYMBOL(vsscanf);
828
829/**
830 * sscanf - Unformat a buffer into a list of arguments
831 * @buf: input buffer
832 * @fmt: formatting of buffer
833 * @...: resulting arguments
834 */
835int sscanf(const char * buf, const char * fmt, ...)
836{
837 va_list args;
838 int i;
839
840 va_start(args,fmt);
841 i = vsscanf(buf,fmt,args);
842 va_end(args);
843 return i;
844}
845
846EXPORT_SYMBOL(sscanf);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-27 20:43:15 -0500