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1da177e4 LT |
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 | */ | |
34 | unsigned 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 | ||
62 | EXPORT_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 | */ | |
70 | long 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 | ||
77 | EXPORT_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 | */ | |
85 | unsigned 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 | ||
113 | EXPORT_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 | */ | |
121 | long 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 | ||
128 | static 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 | ||
145 | static 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 | */ | |
256 | int 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 */ | |
80322306 | 272 | /* 't' added for ptrdiff_t */ |
1da177e4 LT |
273 | |
274 | /* Reject out-of-range values early */ | |
275 | if (unlikely((int) size < 0)) { | |
276 | /* There can be only one.. */ | |
277 | static int warn = 1; | |
278 | WARN_ON(warn); | |
279 | warn = 0; | |
280 | return 0; | |
281 | } | |
282 | ||
283 | str = buf; | |
284 | end = buf + size - 1; | |
285 | ||
286 | if (end < buf - 1) { | |
287 | end = ((void *) -1); | |
288 | size = end - buf + 1; | |
289 | } | |
290 | ||
291 | for (; *fmt ; ++fmt) { | |
292 | if (*fmt != '%') { | |
293 | if (str <= end) | |
294 | *str = *fmt; | |
295 | ++str; | |
296 | continue; | |
297 | } | |
298 | ||
299 | /* process flags */ | |
300 | flags = 0; | |
301 | repeat: | |
302 | ++fmt; /* this also skips first '%' */ | |
303 | switch (*fmt) { | |
304 | case '-': flags |= LEFT; goto repeat; | |
305 | case '+': flags |= PLUS; goto repeat; | |
306 | case ' ': flags |= SPACE; goto repeat; | |
307 | case '#': flags |= SPECIAL; goto repeat; | |
308 | case '0': flags |= ZEROPAD; goto repeat; | |
309 | } | |
310 | ||
311 | /* get field width */ | |
312 | field_width = -1; | |
313 | if (isdigit(*fmt)) | |
314 | field_width = skip_atoi(&fmt); | |
315 | else if (*fmt == '*') { | |
316 | ++fmt; | |
317 | /* it's the next argument */ | |
318 | field_width = va_arg(args, int); | |
319 | if (field_width < 0) { | |
320 | field_width = -field_width; | |
321 | flags |= LEFT; | |
322 | } | |
323 | } | |
324 | ||
325 | /* get the precision */ | |
326 | precision = -1; | |
327 | if (*fmt == '.') { | |
328 | ++fmt; | |
329 | if (isdigit(*fmt)) | |
330 | precision = skip_atoi(&fmt); | |
331 | else if (*fmt == '*') { | |
332 | ++fmt; | |
333 | /* it's the next argument */ | |
334 | precision = va_arg(args, int); | |
335 | } | |
336 | if (precision < 0) | |
337 | precision = 0; | |
338 | } | |
339 | ||
340 | /* get the conversion qualifier */ | |
341 | qualifier = -1; | |
342 | if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || | |
80322306 | 343 | *fmt =='Z' || *fmt == 'z' || *fmt == 't') { |
1da177e4 LT |
344 | qualifier = *fmt; |
345 | ++fmt; | |
346 | if (qualifier == 'l' && *fmt == 'l') { | |
347 | qualifier = 'L'; | |
348 | ++fmt; | |
349 | } | |
350 | } | |
351 | ||
352 | /* default base */ | |
353 | base = 10; | |
354 | ||
355 | switch (*fmt) { | |
356 | case 'c': | |
357 | if (!(flags & LEFT)) { | |
358 | while (--field_width > 0) { | |
359 | if (str <= end) | |
360 | *str = ' '; | |
361 | ++str; | |
362 | } | |
363 | } | |
364 | c = (unsigned char) va_arg(args, int); | |
365 | if (str <= end) | |
366 | *str = c; | |
367 | ++str; | |
368 | while (--field_width > 0) { | |
369 | if (str <= end) | |
370 | *str = ' '; | |
371 | ++str; | |
372 | } | |
373 | continue; | |
374 | ||
375 | case 's': | |
376 | s = va_arg(args, char *); | |
377 | if ((unsigned long)s < PAGE_SIZE) | |
378 | s = "<NULL>"; | |
379 | ||
380 | len = strnlen(s, precision); | |
381 | ||
382 | if (!(flags & LEFT)) { | |
383 | while (len < field_width--) { | |
384 | if (str <= end) | |
385 | *str = ' '; | |
386 | ++str; | |
387 | } | |
388 | } | |
389 | for (i = 0; i < len; ++i) { | |
390 | if (str <= end) | |
391 | *str = *s; | |
392 | ++str; ++s; | |
393 | } | |
394 | while (len < field_width--) { | |
395 | if (str <= end) | |
396 | *str = ' '; | |
397 | ++str; | |
398 | } | |
399 | continue; | |
400 | ||
401 | case 'p': | |
402 | if (field_width == -1) { | |
403 | field_width = 2*sizeof(void *); | |
404 | flags |= ZEROPAD; | |
405 | } | |
406 | str = number(str, end, | |
407 | (unsigned long) va_arg(args, void *), | |
408 | 16, field_width, precision, flags); | |
409 | continue; | |
410 | ||
411 | ||
412 | case 'n': | |
413 | /* FIXME: | |
414 | * What does C99 say about the overflow case here? */ | |
415 | if (qualifier == 'l') { | |
416 | long * ip = va_arg(args, long *); | |
417 | *ip = (str - buf); | |
418 | } else if (qualifier == 'Z' || qualifier == 'z') { | |
419 | size_t * ip = va_arg(args, size_t *); | |
420 | *ip = (str - buf); | |
421 | } else { | |
422 | int * ip = va_arg(args, int *); | |
423 | *ip = (str - buf); | |
424 | } | |
425 | continue; | |
426 | ||
427 | case '%': | |
428 | if (str <= end) | |
429 | *str = '%'; | |
430 | ++str; | |
431 | continue; | |
432 | ||
433 | /* integer number formats - set up the flags and "break" */ | |
434 | case 'o': | |
435 | base = 8; | |
436 | break; | |
437 | ||
438 | case 'X': | |
439 | flags |= LARGE; | |
440 | case 'x': | |
441 | base = 16; | |
442 | break; | |
443 | ||
444 | case 'd': | |
445 | case 'i': | |
446 | flags |= SIGN; | |
447 | case 'u': | |
448 | break; | |
449 | ||
450 | default: | |
451 | if (str <= end) | |
452 | *str = '%'; | |
453 | ++str; | |
454 | if (*fmt) { | |
455 | if (str <= end) | |
456 | *str = *fmt; | |
457 | ++str; | |
458 | } else { | |
459 | --fmt; | |
460 | } | |
461 | continue; | |
462 | } | |
463 | if (qualifier == 'L') | |
464 | num = va_arg(args, long long); | |
465 | else if (qualifier == 'l') { | |
466 | num = va_arg(args, unsigned long); | |
467 | if (flags & SIGN) | |
468 | num = (signed long) num; | |
469 | } else if (qualifier == 'Z' || qualifier == 'z') { | |
470 | num = va_arg(args, size_t); | |
80322306 AV |
471 | } else if (qualifier == 't') { |
472 | num = va_arg(args, ptrdiff_t); | |
1da177e4 LT |
473 | } else if (qualifier == 'h') { |
474 | num = (unsigned short) va_arg(args, int); | |
475 | if (flags & SIGN) | |
476 | num = (signed short) num; | |
477 | } else { | |
478 | num = va_arg(args, unsigned int); | |
479 | if (flags & SIGN) | |
480 | num = (signed int) num; | |
481 | } | |
482 | str = number(str, end, num, base, | |
483 | field_width, precision, flags); | |
484 | } | |
485 | if (str <= end) | |
486 | *str = '\0'; | |
487 | else if (size > 0) | |
488 | /* don't write out a null byte if the buf size is zero */ | |
489 | *end = '\0'; | |
490 | /* the trailing null byte doesn't count towards the total | |
491 | * ++str; | |
492 | */ | |
493 | return str-buf; | |
494 | } | |
495 | ||
496 | EXPORT_SYMBOL(vsnprintf); | |
497 | ||
498 | /** | |
499 | * vscnprintf - Format a string and place it in a buffer | |
500 | * @buf: The buffer to place the result into | |
501 | * @size: The size of the buffer, including the trailing null space | |
502 | * @fmt: The format string to use | |
503 | * @args: Arguments for the format string | |
504 | * | |
505 | * The return value is the number of characters which have been written into | |
506 | * the @buf not including the trailing '\0'. If @size is <= 0 the function | |
507 | * returns 0. | |
508 | * | |
509 | * Call this function if you are already dealing with a va_list. | |
510 | * You probably want scnprintf instead. | |
511 | */ | |
512 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
513 | { | |
514 | int i; | |
515 | ||
516 | i=vsnprintf(buf,size,fmt,args); | |
517 | return (i >= size) ? (size - 1) : i; | |
518 | } | |
519 | ||
520 | EXPORT_SYMBOL(vscnprintf); | |
521 | ||
522 | /** | |
523 | * snprintf - Format a string and place it in a buffer | |
524 | * @buf: The buffer to place the result into | |
525 | * @size: The size of the buffer, including the trailing null space | |
526 | * @fmt: The format string to use | |
527 | * @...: Arguments for the format string | |
528 | * | |
529 | * The return value is the number of characters which would be | |
530 | * generated for the given input, excluding the trailing null, | |
531 | * as per ISO C99. If the return is greater than or equal to | |
532 | * @size, the resulting string is truncated. | |
533 | */ | |
534 | int snprintf(char * buf, size_t size, const char *fmt, ...) | |
535 | { | |
536 | va_list args; | |
537 | int i; | |
538 | ||
539 | va_start(args, fmt); | |
540 | i=vsnprintf(buf,size,fmt,args); | |
541 | va_end(args); | |
542 | return i; | |
543 | } | |
544 | ||
545 | EXPORT_SYMBOL(snprintf); | |
546 | ||
547 | /** | |
548 | * scnprintf - Format a string and place it in a buffer | |
549 | * @buf: The buffer to place the result into | |
550 | * @size: The size of the buffer, including the trailing null space | |
551 | * @fmt: The format string to use | |
552 | * @...: Arguments for the format string | |
553 | * | |
554 | * The return value is the number of characters written into @buf not including | |
555 | * the trailing '\0'. If @size is <= 0 the function returns 0. If the return is | |
556 | * greater than or equal to @size, the resulting string is truncated. | |
557 | */ | |
558 | ||
559 | int scnprintf(char * buf, size_t size, const char *fmt, ...) | |
560 | { | |
561 | va_list args; | |
562 | int i; | |
563 | ||
564 | va_start(args, fmt); | |
565 | i = vsnprintf(buf, size, fmt, args); | |
566 | va_end(args); | |
567 | return (i >= size) ? (size - 1) : i; | |
568 | } | |
569 | EXPORT_SYMBOL(scnprintf); | |
570 | ||
571 | /** | |
572 | * vsprintf - Format a string and place it in a buffer | |
573 | * @buf: The buffer to place the result into | |
574 | * @fmt: The format string to use | |
575 | * @args: Arguments for the format string | |
576 | * | |
577 | * The function returns the number of characters written | |
578 | * into @buf. Use vsnprintf or vscnprintf in order to avoid | |
579 | * buffer overflows. | |
580 | * | |
581 | * Call this function if you are already dealing with a va_list. | |
582 | * You probably want sprintf instead. | |
583 | */ | |
584 | int vsprintf(char *buf, const char *fmt, va_list args) | |
585 | { | |
586 | return vsnprintf(buf, INT_MAX, fmt, args); | |
587 | } | |
588 | ||
589 | EXPORT_SYMBOL(vsprintf); | |
590 | ||
591 | /** | |
592 | * sprintf - Format a string and place it in a buffer | |
593 | * @buf: The buffer to place the result into | |
594 | * @fmt: The format string to use | |
595 | * @...: Arguments for the format string | |
596 | * | |
597 | * The function returns the number of characters written | |
598 | * into @buf. Use snprintf or scnprintf in order to avoid | |
599 | * buffer overflows. | |
600 | */ | |
601 | int sprintf(char * buf, const char *fmt, ...) | |
602 | { | |
603 | va_list args; | |
604 | int i; | |
605 | ||
606 | va_start(args, fmt); | |
607 | i=vsnprintf(buf, INT_MAX, fmt, args); | |
608 | va_end(args); | |
609 | return i; | |
610 | } | |
611 | ||
612 | EXPORT_SYMBOL(sprintf); | |
613 | ||
614 | /** | |
615 | * vsscanf - Unformat a buffer into a list of arguments | |
616 | * @buf: input buffer | |
617 | * @fmt: format of buffer | |
618 | * @args: arguments | |
619 | */ | |
620 | int vsscanf(const char * buf, const char * fmt, va_list args) | |
621 | { | |
622 | const char *str = buf; | |
623 | char *next; | |
624 | char digit; | |
625 | int num = 0; | |
626 | int qualifier; | |
627 | int base; | |
628 | int field_width; | |
629 | int is_sign = 0; | |
630 | ||
631 | while(*fmt && *str) { | |
632 | /* skip any white space in format */ | |
633 | /* white space in format matchs any amount of | |
634 | * white space, including none, in the input. | |
635 | */ | |
636 | if (isspace(*fmt)) { | |
637 | while (isspace(*fmt)) | |
638 | ++fmt; | |
639 | while (isspace(*str)) | |
640 | ++str; | |
641 | } | |
642 | ||
643 | /* anything that is not a conversion must match exactly */ | |
644 | if (*fmt != '%' && *fmt) { | |
645 | if (*fmt++ != *str++) | |
646 | break; | |
647 | continue; | |
648 | } | |
649 | ||
650 | if (!*fmt) | |
651 | break; | |
652 | ++fmt; | |
653 | ||
654 | /* skip this conversion. | |
655 | * advance both strings to next white space | |
656 | */ | |
657 | if (*fmt == '*') { | |
658 | while (!isspace(*fmt) && *fmt) | |
659 | fmt++; | |
660 | while (!isspace(*str) && *str) | |
661 | str++; | |
662 | continue; | |
663 | } | |
664 | ||
665 | /* get field width */ | |
666 | field_width = -1; | |
667 | if (isdigit(*fmt)) | |
668 | field_width = skip_atoi(&fmt); | |
669 | ||
670 | /* get conversion qualifier */ | |
671 | qualifier = -1; | |
672 | if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || | |
673 | *fmt == 'Z' || *fmt == 'z') { | |
674 | qualifier = *fmt++; | |
675 | if (unlikely(qualifier == *fmt)) { | |
676 | if (qualifier == 'h') { | |
677 | qualifier = 'H'; | |
678 | fmt++; | |
679 | } else if (qualifier == 'l') { | |
680 | qualifier = 'L'; | |
681 | fmt++; | |
682 | } | |
683 | } | |
684 | } | |
685 | base = 10; | |
686 | is_sign = 0; | |
687 | ||
688 | if (!*fmt || !*str) | |
689 | break; | |
690 | ||
691 | switch(*fmt++) { | |
692 | case 'c': | |
693 | { | |
694 | char *s = (char *) va_arg(args,char*); | |
695 | if (field_width == -1) | |
696 | field_width = 1; | |
697 | do { | |
698 | *s++ = *str++; | |
699 | } while (--field_width > 0 && *str); | |
700 | num++; | |
701 | } | |
702 | continue; | |
703 | case 's': | |
704 | { | |
705 | char *s = (char *) va_arg(args, char *); | |
706 | if(field_width == -1) | |
707 | field_width = INT_MAX; | |
708 | /* first, skip leading white space in buffer */ | |
709 | while (isspace(*str)) | |
710 | str++; | |
711 | ||
712 | /* now copy until next white space */ | |
713 | while (*str && !isspace(*str) && field_width--) { | |
714 | *s++ = *str++; | |
715 | } | |
716 | *s = '\0'; | |
717 | num++; | |
718 | } | |
719 | continue; | |
720 | case 'n': | |
721 | /* return number of characters read so far */ | |
722 | { | |
723 | int *i = (int *)va_arg(args,int*); | |
724 | *i = str - buf; | |
725 | } | |
726 | continue; | |
727 | case 'o': | |
728 | base = 8; | |
729 | break; | |
730 | case 'x': | |
731 | case 'X': | |
732 | base = 16; | |
733 | break; | |
734 | case 'i': | |
735 | base = 0; | |
736 | case 'd': | |
737 | is_sign = 1; | |
738 | case 'u': | |
739 | break; | |
740 | case '%': | |
741 | /* looking for '%' in str */ | |
742 | if (*str++ != '%') | |
743 | return num; | |
744 | continue; | |
745 | default: | |
746 | /* invalid format; stop here */ | |
747 | return num; | |
748 | } | |
749 | ||
750 | /* have some sort of integer conversion. | |
751 | * first, skip white space in buffer. | |
752 | */ | |
753 | while (isspace(*str)) | |
754 | str++; | |
755 | ||
756 | digit = *str; | |
757 | if (is_sign && digit == '-') | |
758 | digit = *(str + 1); | |
759 | ||
760 | if (!digit | |
761 | || (base == 16 && !isxdigit(digit)) | |
762 | || (base == 10 && !isdigit(digit)) | |
763 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
764 | || (base == 0 && !isdigit(digit))) | |
765 | break; | |
766 | ||
767 | switch(qualifier) { | |
768 | case 'H': /* that's 'hh' in format */ | |
769 | if (is_sign) { | |
770 | signed char *s = (signed char *) va_arg(args,signed char *); | |
771 | *s = (signed char) simple_strtol(str,&next,base); | |
772 | } else { | |
773 | unsigned char *s = (unsigned char *) va_arg(args, unsigned char *); | |
774 | *s = (unsigned char) simple_strtoul(str, &next, base); | |
775 | } | |
776 | break; | |
777 | case 'h': | |
778 | if (is_sign) { | |
779 | short *s = (short *) va_arg(args,short *); | |
780 | *s = (short) simple_strtol(str,&next,base); | |
781 | } else { | |
782 | unsigned short *s = (unsigned short *) va_arg(args, unsigned short *); | |
783 | *s = (unsigned short) simple_strtoul(str, &next, base); | |
784 | } | |
785 | break; | |
786 | case 'l': | |
787 | if (is_sign) { | |
788 | long *l = (long *) va_arg(args,long *); | |
789 | *l = simple_strtol(str,&next,base); | |
790 | } else { | |
791 | unsigned long *l = (unsigned long*) va_arg(args,unsigned long*); | |
792 | *l = simple_strtoul(str,&next,base); | |
793 | } | |
794 | break; | |
795 | case 'L': | |
796 | if (is_sign) { | |
797 | long long *l = (long long*) va_arg(args,long long *); | |
798 | *l = simple_strtoll(str,&next,base); | |
799 | } else { | |
800 | unsigned long long *l = (unsigned long long*) va_arg(args,unsigned long long*); | |
801 | *l = simple_strtoull(str,&next,base); | |
802 | } | |
803 | break; | |
804 | case 'Z': | |
805 | case 'z': | |
806 | { | |
807 | size_t *s = (size_t*) va_arg(args,size_t*); | |
808 | *s = (size_t) simple_strtoul(str,&next,base); | |
809 | } | |
810 | break; | |
811 | default: | |
812 | if (is_sign) { | |
813 | int *i = (int *) va_arg(args, int*); | |
814 | *i = (int) simple_strtol(str,&next,base); | |
815 | } else { | |
816 | unsigned int *i = (unsigned int*) va_arg(args, unsigned int*); | |
817 | *i = (unsigned int) simple_strtoul(str,&next,base); | |
818 | } | |
819 | break; | |
820 | } | |
821 | num++; | |
822 | ||
823 | if (!next) | |
824 | break; | |
825 | str = next; | |
826 | } | |
827 | return num; | |
828 | } | |
829 | ||
830 | EXPORT_SYMBOL(vsscanf); | |
831 | ||
832 | /** | |
833 | * sscanf - Unformat a buffer into a list of arguments | |
834 | * @buf: input buffer | |
835 | * @fmt: formatting of buffer | |
836 | * @...: resulting arguments | |
837 | */ | |
838 | int sscanf(const char * buf, const char * fmt, ...) | |
839 | { | |
840 | va_list args; | |
841 | int i; | |
842 | ||
843 | va_start(args,fmt); | |
844 | i = vsscanf(buf,fmt,args); | |
845 | va_end(args); | |
846 | return i; | |
847 | } | |
848 | ||
849 | EXPORT_SYMBOL(sscanf); |