Commit | Line | Data |
---|---|---|
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> | |
0fe1ef24 LT |
25 | #include <linux/kallsyms.h> |
26 | #include <linux/uaccess.h> | |
1da177e4 | 27 | |
4e57b681 | 28 | #include <asm/page.h> /* for PAGE_SIZE */ |
1da177e4 | 29 | #include <asm/div64.h> |
deac93df | 30 | #include <asm/sections.h> /* for dereference_function_descriptor() */ |
1da177e4 | 31 | |
9b706aee DV |
32 | /* Works only for digits and letters, but small and fast */ |
33 | #define TOLOWER(x) ((x) | 0x20) | |
34 | ||
aa46a63e HH |
35 | static unsigned int simple_guess_base(const char *cp) |
36 | { | |
37 | if (cp[0] == '0') { | |
38 | if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2])) | |
39 | return 16; | |
40 | else | |
41 | return 8; | |
42 | } else { | |
43 | return 10; | |
44 | } | |
45 | } | |
46 | ||
1da177e4 LT |
47 | /** |
48 | * simple_strtoul - convert a string to an unsigned long | |
49 | * @cp: The start of the string | |
50 | * @endp: A pointer to the end of the parsed string will be placed here | |
51 | * @base: The number base to use | |
52 | */ | |
22d27051 | 53 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
1da177e4 | 54 | { |
aa46a63e HH |
55 | unsigned long result = 0; |
56 | ||
57 | if (!base) | |
58 | base = simple_guess_base(cp); | |
59 | ||
60 | if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x') | |
61 | cp += 2; | |
62 | ||
63 | while (isxdigit(*cp)) { | |
64 | unsigned int value; | |
65 | ||
66 | value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10; | |
67 | if (value >= base) | |
68 | break; | |
69 | result = result * base + value; | |
1da177e4 LT |
70 | cp++; |
71 | } | |
aa46a63e | 72 | |
1da177e4 LT |
73 | if (endp) |
74 | *endp = (char *)cp; | |
75 | return result; | |
76 | } | |
1da177e4 LT |
77 | EXPORT_SYMBOL(simple_strtoul); |
78 | ||
79 | /** | |
80 | * simple_strtol - convert a string to a signed 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 | */ | |
22d27051 | 85 | long simple_strtol(const char *cp, char **endp, unsigned int base) |
1da177e4 | 86 | { |
22d27051 HH |
87 | if(*cp == '-') |
88 | return -simple_strtoul(cp + 1, endp, base); | |
89 | return simple_strtoul(cp, endp, base); | |
1da177e4 | 90 | } |
1da177e4 LT |
91 | EXPORT_SYMBOL(simple_strtol); |
92 | ||
93 | /** | |
94 | * simple_strtoull - convert a string to an unsigned long long | |
95 | * @cp: The start of the string | |
96 | * @endp: A pointer to the end of the parsed string will be placed here | |
97 | * @base: The number base to use | |
98 | */ | |
22d27051 | 99 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
1da177e4 | 100 | { |
aa46a63e HH |
101 | unsigned long long result = 0; |
102 | ||
103 | if (!base) | |
104 | base = simple_guess_base(cp); | |
105 | ||
106 | if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x') | |
107 | cp += 2; | |
108 | ||
109 | while (isxdigit(*cp)) { | |
110 | unsigned int value; | |
111 | ||
112 | value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10; | |
113 | if (value >= base) | |
114 | break; | |
115 | result = result * base + value; | |
1da177e4 LT |
116 | cp++; |
117 | } | |
aa46a63e | 118 | |
1da177e4 LT |
119 | if (endp) |
120 | *endp = (char *)cp; | |
121 | return result; | |
122 | } | |
1da177e4 LT |
123 | EXPORT_SYMBOL(simple_strtoull); |
124 | ||
125 | /** | |
126 | * simple_strtoll - convert a string to a signed long long | |
127 | * @cp: The start of the string | |
128 | * @endp: A pointer to the end of the parsed string will be placed here | |
129 | * @base: The number base to use | |
130 | */ | |
22d27051 | 131 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
1da177e4 LT |
132 | { |
133 | if(*cp=='-') | |
22d27051 HH |
134 | return -simple_strtoull(cp + 1, endp, base); |
135 | return simple_strtoull(cp, endp, base); | |
1da177e4 LT |
136 | } |
137 | ||
06b2a76d YY |
138 | |
139 | /** | |
140 | * strict_strtoul - convert a string to an unsigned long strictly | |
141 | * @cp: The string to be converted | |
142 | * @base: The number base to use | |
143 | * @res: The converted result value | |
144 | * | |
145 | * strict_strtoul converts a string to an unsigned long only if the | |
146 | * string is really an unsigned long string, any string containing | |
147 | * any invalid char at the tail will be rejected and -EINVAL is returned, | |
148 | * only a newline char at the tail is acceptible because people generally | |
149 | * change a module parameter in the following way: | |
150 | * | |
151 | * echo 1024 > /sys/module/e1000/parameters/copybreak | |
152 | * | |
153 | * echo will append a newline to the tail. | |
154 | * | |
155 | * It returns 0 if conversion is successful and *res is set to the converted | |
156 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
157 | * | |
158 | * simple_strtoul just ignores the successive invalid characters and | |
159 | * return the converted value of prefix part of the string. | |
160 | */ | |
161 | int strict_strtoul(const char *cp, unsigned int base, unsigned long *res); | |
162 | ||
163 | /** | |
164 | * strict_strtol - convert a string to a long strictly | |
165 | * @cp: The string to be converted | |
166 | * @base: The number base to use | |
167 | * @res: The converted result value | |
168 | * | |
169 | * strict_strtol is similiar to strict_strtoul, but it allows the first | |
170 | * character of a string is '-'. | |
171 | * | |
172 | * It returns 0 if conversion is successful and *res is set to the converted | |
173 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
174 | */ | |
175 | int strict_strtol(const char *cp, unsigned int base, long *res); | |
176 | ||
177 | /** | |
178 | * strict_strtoull - convert a string to an unsigned long long strictly | |
179 | * @cp: The string to be converted | |
180 | * @base: The number base to use | |
181 | * @res: The converted result value | |
182 | * | |
183 | * strict_strtoull converts a string to an unsigned long long only if the | |
184 | * string is really an unsigned long long string, any string containing | |
185 | * any invalid char at the tail will be rejected and -EINVAL is returned, | |
186 | * only a newline char at the tail is acceptible because people generally | |
187 | * change a module parameter in the following way: | |
188 | * | |
189 | * echo 1024 > /sys/module/e1000/parameters/copybreak | |
190 | * | |
191 | * echo will append a newline to the tail of the string. | |
192 | * | |
193 | * It returns 0 if conversion is successful and *res is set to the converted | |
194 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
195 | * | |
196 | * simple_strtoull just ignores the successive invalid characters and | |
197 | * return the converted value of prefix part of the string. | |
198 | */ | |
199 | int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res); | |
200 | ||
201 | /** | |
202 | * strict_strtoll - convert a string to a long long strictly | |
203 | * @cp: The string to be converted | |
204 | * @base: The number base to use | |
205 | * @res: The converted result value | |
206 | * | |
207 | * strict_strtoll is similiar to strict_strtoull, but it allows the first | |
208 | * character of a string is '-'. | |
209 | * | |
210 | * It returns 0 if conversion is successful and *res is set to the converted | |
211 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
212 | */ | |
213 | int strict_strtoll(const char *cp, unsigned int base, long long *res); | |
214 | ||
215 | #define define_strict_strtoux(type, valtype) \ | |
216 | int strict_strtou##type(const char *cp, unsigned int base, valtype *res)\ | |
217 | { \ | |
218 | char *tail; \ | |
219 | valtype val; \ | |
220 | size_t len; \ | |
221 | \ | |
222 | *res = 0; \ | |
223 | len = strlen(cp); \ | |
224 | if (len == 0) \ | |
225 | return -EINVAL; \ | |
226 | \ | |
29a6d39b | 227 | val = simple_strtou##type(cp, &tail, base); \ |
06b2a76d YY |
228 | if ((*tail == '\0') || \ |
229 | ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {\ | |
230 | *res = val; \ | |
231 | return 0; \ | |
232 | } \ | |
233 | \ | |
234 | return -EINVAL; \ | |
235 | } \ | |
236 | ||
237 | #define define_strict_strtox(type, valtype) \ | |
238 | int strict_strto##type(const char *cp, unsigned int base, valtype *res) \ | |
239 | { \ | |
240 | int ret; \ | |
241 | if (*cp == '-') { \ | |
242 | ret = strict_strtou##type(cp+1, base, res); \ | |
4f9d5f4a | 243 | if (!ret) \ |
06b2a76d YY |
244 | *res = -(*res); \ |
245 | } else \ | |
246 | ret = strict_strtou##type(cp, base, res); \ | |
247 | \ | |
248 | return ret; \ | |
249 | } \ | |
250 | ||
251 | define_strict_strtoux(l, unsigned long) | |
252 | define_strict_strtox(l, long) | |
253 | define_strict_strtoux(ll, unsigned long long) | |
254 | define_strict_strtox(ll, long long) | |
255 | ||
256 | EXPORT_SYMBOL(strict_strtoul); | |
257 | EXPORT_SYMBOL(strict_strtol); | |
258 | EXPORT_SYMBOL(strict_strtoll); | |
259 | EXPORT_SYMBOL(strict_strtoull); | |
260 | ||
1da177e4 LT |
261 | static int skip_atoi(const char **s) |
262 | { | |
263 | int i=0; | |
264 | ||
265 | while (isdigit(**s)) | |
266 | i = i*10 + *((*s)++) - '0'; | |
267 | return i; | |
268 | } | |
269 | ||
4277eedd DV |
270 | /* Decimal conversion is by far the most typical, and is used |
271 | * for /proc and /sys data. This directly impacts e.g. top performance | |
272 | * with many processes running. We optimize it for speed | |
273 | * using code from | |
274 | * http://www.cs.uiowa.edu/~jones/bcd/decimal.html | |
275 | * (with permission from the author, Douglas W. Jones). */ | |
276 | ||
277 | /* Formats correctly any integer in [0,99999]. | |
278 | * Outputs from one to five digits depending on input. | |
279 | * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */ | |
280 | static char* put_dec_trunc(char *buf, unsigned q) | |
281 | { | |
282 | unsigned d3, d2, d1, d0; | |
283 | d1 = (q>>4) & 0xf; | |
284 | d2 = (q>>8) & 0xf; | |
285 | d3 = (q>>12); | |
286 | ||
287 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); | |
288 | q = (d0 * 0xcd) >> 11; | |
289 | d0 = d0 - 10*q; | |
290 | *buf++ = d0 + '0'; /* least significant digit */ | |
291 | d1 = q + 9*d3 + 5*d2 + d1; | |
292 | if (d1 != 0) { | |
293 | q = (d1 * 0xcd) >> 11; | |
294 | d1 = d1 - 10*q; | |
295 | *buf++ = d1 + '0'; /* next digit */ | |
296 | ||
297 | d2 = q + 2*d2; | |
298 | if ((d2 != 0) || (d3 != 0)) { | |
299 | q = (d2 * 0xd) >> 7; | |
300 | d2 = d2 - 10*q; | |
301 | *buf++ = d2 + '0'; /* next digit */ | |
302 | ||
303 | d3 = q + 4*d3; | |
304 | if (d3 != 0) { | |
305 | q = (d3 * 0xcd) >> 11; | |
306 | d3 = d3 - 10*q; | |
307 | *buf++ = d3 + '0'; /* next digit */ | |
308 | if (q != 0) | |
309 | *buf++ = q + '0'; /* most sign. digit */ | |
310 | } | |
311 | } | |
312 | } | |
313 | return buf; | |
314 | } | |
315 | /* Same with if's removed. Always emits five digits */ | |
316 | static char* put_dec_full(char *buf, unsigned q) | |
317 | { | |
318 | /* BTW, if q is in [0,9999], 8-bit ints will be enough, */ | |
319 | /* but anyway, gcc produces better code with full-sized ints */ | |
320 | unsigned d3, d2, d1, d0; | |
321 | d1 = (q>>4) & 0xf; | |
322 | d2 = (q>>8) & 0xf; | |
323 | d3 = (q>>12); | |
324 | ||
325 | /* Possible ways to approx. divide by 10 */ | |
326 | /* gcc -O2 replaces multiply with shifts and adds */ | |
327 | // (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386) | |
328 | // (x * 0x67) >> 10: 1100111 | |
329 | // (x * 0x34) >> 9: 110100 - same | |
330 | // (x * 0x1a) >> 8: 11010 - same | |
331 | // (x * 0x0d) >> 7: 1101 - same, shortest code (on i386) | |
332 | ||
333 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); | |
334 | q = (d0 * 0xcd) >> 11; | |
335 | d0 = d0 - 10*q; | |
336 | *buf++ = d0 + '0'; | |
337 | d1 = q + 9*d3 + 5*d2 + d1; | |
338 | q = (d1 * 0xcd) >> 11; | |
339 | d1 = d1 - 10*q; | |
340 | *buf++ = d1 + '0'; | |
341 | ||
342 | d2 = q + 2*d2; | |
343 | q = (d2 * 0xd) >> 7; | |
344 | d2 = d2 - 10*q; | |
345 | *buf++ = d2 + '0'; | |
346 | ||
347 | d3 = q + 4*d3; | |
348 | q = (d3 * 0xcd) >> 11; /* - shorter code */ | |
349 | /* q = (d3 * 0x67) >> 10; - would also work */ | |
350 | d3 = d3 - 10*q; | |
351 | *buf++ = d3 + '0'; | |
352 | *buf++ = q + '0'; | |
353 | return buf; | |
354 | } | |
355 | /* No inlining helps gcc to use registers better */ | |
356 | static noinline char* put_dec(char *buf, unsigned long long num) | |
357 | { | |
358 | while (1) { | |
359 | unsigned rem; | |
360 | if (num < 100000) | |
361 | return put_dec_trunc(buf, num); | |
362 | rem = do_div(num, 100000); | |
363 | buf = put_dec_full(buf, rem); | |
364 | } | |
365 | } | |
366 | ||
1da177e4 LT |
367 | #define ZEROPAD 1 /* pad with zero */ |
368 | #define SIGN 2 /* unsigned/signed long */ | |
369 | #define PLUS 4 /* show plus */ | |
370 | #define SPACE 8 /* space if plus */ | |
371 | #define LEFT 16 /* left justified */ | |
9b706aee DV |
372 | #define SMALL 32 /* Must be 32 == 0x20 */ |
373 | #define SPECIAL 64 /* 0x */ | |
1da177e4 | 374 | |
b39a7340 | 375 | static char *number(char *buf, char *end, unsigned long long num, int base, int size, int precision, int type) |
1da177e4 | 376 | { |
9b706aee DV |
377 | /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ |
378 | static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ | |
379 | ||
380 | char tmp[66]; | |
381 | char sign; | |
382 | char locase; | |
b39a7340 | 383 | int need_pfx = ((type & SPECIAL) && base != 10); |
1da177e4 LT |
384 | int i; |
385 | ||
9b706aee DV |
386 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
387 | * produces same digits or (maybe lowercased) letters */ | |
388 | locase = (type & SMALL); | |
1da177e4 LT |
389 | if (type & LEFT) |
390 | type &= ~ZEROPAD; | |
1da177e4 LT |
391 | sign = 0; |
392 | if (type & SIGN) { | |
393 | if ((signed long long) num < 0) { | |
394 | sign = '-'; | |
395 | num = - (signed long long) num; | |
396 | size--; | |
397 | } else if (type & PLUS) { | |
398 | sign = '+'; | |
399 | size--; | |
400 | } else if (type & SPACE) { | |
401 | sign = ' '; | |
402 | size--; | |
403 | } | |
404 | } | |
b39a7340 DV |
405 | if (need_pfx) { |
406 | size--; | |
1da177e4 | 407 | if (base == 16) |
1da177e4 LT |
408 | size--; |
409 | } | |
b39a7340 DV |
410 | |
411 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 LT |
412 | i = 0; |
413 | if (num == 0) | |
b39a7340 | 414 | tmp[i++] = '0'; |
4277eedd DV |
415 | /* Generic code, for any base: |
416 | else do { | |
9b706aee | 417 | tmp[i++] = (digits[do_div(num,base)] | locase); |
4277eedd DV |
418 | } while (num != 0); |
419 | */ | |
b39a7340 DV |
420 | else if (base != 10) { /* 8 or 16 */ |
421 | int mask = base - 1; | |
422 | int shift = 3; | |
423 | if (base == 16) shift = 4; | |
424 | do { | |
9b706aee | 425 | tmp[i++] = (digits[((unsigned char)num) & mask] | locase); |
b39a7340 DV |
426 | num >>= shift; |
427 | } while (num); | |
4277eedd DV |
428 | } else { /* base 10 */ |
429 | i = put_dec(tmp, num) - tmp; | |
430 | } | |
b39a7340 DV |
431 | |
432 | /* printing 100 using %2d gives "100", not "00" */ | |
1da177e4 LT |
433 | if (i > precision) |
434 | precision = i; | |
b39a7340 | 435 | /* leading space padding */ |
1da177e4 | 436 | size -= precision; |
b39a7340 DV |
437 | if (!(type & (ZEROPAD+LEFT))) { |
438 | while(--size >= 0) { | |
f796937a | 439 | if (buf < end) |
1da177e4 LT |
440 | *buf = ' '; |
441 | ++buf; | |
442 | } | |
443 | } | |
b39a7340 | 444 | /* sign */ |
1da177e4 | 445 | if (sign) { |
f796937a | 446 | if (buf < end) |
1da177e4 LT |
447 | *buf = sign; |
448 | ++buf; | |
449 | } | |
b39a7340 DV |
450 | /* "0x" / "0" prefix */ |
451 | if (need_pfx) { | |
452 | if (buf < end) | |
453 | *buf = '0'; | |
454 | ++buf; | |
455 | if (base == 16) { | |
f796937a | 456 | if (buf < end) |
9b706aee | 457 | *buf = ('X' | locase); |
1da177e4 LT |
458 | ++buf; |
459 | } | |
460 | } | |
b39a7340 | 461 | /* zero or space padding */ |
1da177e4 | 462 | if (!(type & LEFT)) { |
b39a7340 DV |
463 | char c = (type & ZEROPAD) ? '0' : ' '; |
464 | while (--size >= 0) { | |
f796937a | 465 | if (buf < end) |
1da177e4 LT |
466 | *buf = c; |
467 | ++buf; | |
468 | } | |
469 | } | |
b39a7340 DV |
470 | /* hmm even more zero padding? */ |
471 | while (i <= --precision) { | |
f796937a | 472 | if (buf < end) |
1da177e4 LT |
473 | *buf = '0'; |
474 | ++buf; | |
475 | } | |
b39a7340 DV |
476 | /* actual digits of result */ |
477 | while (--i >= 0) { | |
f796937a | 478 | if (buf < end) |
1da177e4 LT |
479 | *buf = tmp[i]; |
480 | ++buf; | |
481 | } | |
b39a7340 DV |
482 | /* trailing space padding */ |
483 | while (--size >= 0) { | |
f796937a | 484 | if (buf < end) |
1da177e4 LT |
485 | *buf = ' '; |
486 | ++buf; | |
487 | } | |
488 | return buf; | |
489 | } | |
490 | ||
0f9bfa56 LT |
491 | static char *string(char *buf, char *end, char *s, int field_width, int precision, int flags) |
492 | { | |
493 | int len, i; | |
494 | ||
495 | if ((unsigned long)s < PAGE_SIZE) | |
496 | s = "<NULL>"; | |
497 | ||
498 | len = strnlen(s, precision); | |
499 | ||
500 | if (!(flags & LEFT)) { | |
501 | while (len < field_width--) { | |
502 | if (buf < end) | |
503 | *buf = ' '; | |
504 | ++buf; | |
505 | } | |
506 | } | |
507 | for (i = 0; i < len; ++i) { | |
508 | if (buf < end) | |
509 | *buf = *s; | |
510 | ++buf; ++s; | |
511 | } | |
512 | while (len < field_width--) { | |
513 | if (buf < end) | |
514 | *buf = ' '; | |
515 | ++buf; | |
516 | } | |
517 | return buf; | |
518 | } | |
519 | ||
0fe1ef24 LT |
520 | static char *symbol_string(char *buf, char *end, void *ptr, int field_width, int precision, int flags) |
521 | { | |
522 | unsigned long value = (unsigned long) ptr; | |
523 | #ifdef CONFIG_KALLSYMS | |
524 | char sym[KSYM_SYMBOL_LEN]; | |
525 | sprint_symbol(sym, value); | |
526 | return string(buf, end, sym, field_width, precision, flags); | |
527 | #else | |
528 | field_width = 2*sizeof(void *); | |
529 | flags |= SPECIAL | SMALL | ZEROPAD; | |
530 | return number(buf, end, value, 16, field_width, precision, flags); | |
531 | #endif | |
532 | } | |
533 | ||
4d8a743c LT |
534 | /* |
535 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
536 | * by an extra set of alphanumeric characters that are extended format | |
537 | * specifiers. | |
538 | * | |
0fe1ef24 LT |
539 | * Right now we just handle 'F' (for symbolic Function descriptor pointers) |
540 | * and 'S' (for Symbolic direct pointers), but this can easily be | |
541 | * extended in the future (network address types etc). | |
542 | * | |
543 | * The difference between 'S' and 'F' is that on ia64 and ppc64 function | |
544 | * pointers are really function descriptors, which contain a pointer the | |
545 | * real address. | |
4d8a743c LT |
546 | */ |
547 | static char *pointer(const char *fmt, char *buf, char *end, void *ptr, int field_width, int precision, int flags) | |
78a8bf69 | 548 | { |
0fe1ef24 LT |
549 | switch (*fmt) { |
550 | case 'F': | |
551 | ptr = dereference_function_descriptor(ptr); | |
552 | /* Fallthrough */ | |
553 | case 'S': | |
554 | return symbol_string(buf, end, ptr, field_width, precision, flags); | |
555 | } | |
78a8bf69 LT |
556 | flags |= SMALL; |
557 | if (field_width == -1) { | |
558 | field_width = 2*sizeof(void *); | |
559 | flags |= ZEROPAD; | |
560 | } | |
561 | return number(buf, end, (unsigned long) ptr, 16, field_width, precision, flags); | |
562 | } | |
563 | ||
1da177e4 LT |
564 | /** |
565 | * vsnprintf - Format a string and place it in a buffer | |
566 | * @buf: The buffer to place the result into | |
567 | * @size: The size of the buffer, including the trailing null space | |
568 | * @fmt: The format string to use | |
569 | * @args: Arguments for the format string | |
570 | * | |
20036fdc AK |
571 | * This function follows C99 vsnprintf, but has some extensions: |
572 | * %pS output the name of a text symbol | |
573 | * %pF output the name of a function pointer | |
574 | * | |
1da177e4 LT |
575 | * The return value is the number of characters which would |
576 | * be generated for the given input, excluding the trailing | |
577 | * '\0', as per ISO C99. If you want to have the exact | |
578 | * number of characters written into @buf as return value | |
72fd4a35 | 579 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
580 | * return is greater than or equal to @size, the resulting |
581 | * string is truncated. | |
582 | * | |
583 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 584 | * You probably want snprintf() instead. |
1da177e4 LT |
585 | */ |
586 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
587 | { | |
1da177e4 | 588 | unsigned long long num; |
0f9bfa56 | 589 | int base; |
1da177e4 | 590 | char *str, *end, c; |
1da177e4 LT |
591 | |
592 | int flags; /* flags to number() */ | |
593 | ||
594 | int field_width; /* width of output field */ | |
595 | int precision; /* min. # of digits for integers; max | |
596 | number of chars for from string */ | |
597 | int qualifier; /* 'h', 'l', or 'L' for integer fields */ | |
598 | /* 'z' support added 23/7/1999 S.H. */ | |
599 | /* 'z' changed to 'Z' --davidm 1/25/99 */ | |
80322306 | 600 | /* 't' added for ptrdiff_t */ |
1da177e4 | 601 | |
f796937a JF |
602 | /* Reject out-of-range values early. Large positive sizes are |
603 | used for unknown buffer sizes. */ | |
1da177e4 LT |
604 | if (unlikely((int) size < 0)) { |
605 | /* There can be only one.. */ | |
b39a7340 | 606 | static char warn = 1; |
1da177e4 LT |
607 | WARN_ON(warn); |
608 | warn = 0; | |
609 | return 0; | |
610 | } | |
611 | ||
612 | str = buf; | |
f796937a | 613 | end = buf + size; |
1da177e4 | 614 | |
f796937a JF |
615 | /* Make sure end is always >= buf */ |
616 | if (end < buf) { | |
617 | end = ((void *)-1); | |
618 | size = end - buf; | |
1da177e4 LT |
619 | } |
620 | ||
621 | for (; *fmt ; ++fmt) { | |
622 | if (*fmt != '%') { | |
f796937a | 623 | if (str < end) |
1da177e4 LT |
624 | *str = *fmt; |
625 | ++str; | |
626 | continue; | |
627 | } | |
628 | ||
629 | /* process flags */ | |
630 | flags = 0; | |
631 | repeat: | |
632 | ++fmt; /* this also skips first '%' */ | |
633 | switch (*fmt) { | |
634 | case '-': flags |= LEFT; goto repeat; | |
635 | case '+': flags |= PLUS; goto repeat; | |
636 | case ' ': flags |= SPACE; goto repeat; | |
637 | case '#': flags |= SPECIAL; goto repeat; | |
638 | case '0': flags |= ZEROPAD; goto repeat; | |
639 | } | |
640 | ||
641 | /* get field width */ | |
642 | field_width = -1; | |
643 | if (isdigit(*fmt)) | |
644 | field_width = skip_atoi(&fmt); | |
645 | else if (*fmt == '*') { | |
646 | ++fmt; | |
647 | /* it's the next argument */ | |
648 | field_width = va_arg(args, int); | |
649 | if (field_width < 0) { | |
650 | field_width = -field_width; | |
651 | flags |= LEFT; | |
652 | } | |
653 | } | |
654 | ||
655 | /* get the precision */ | |
656 | precision = -1; | |
657 | if (*fmt == '.') { | |
658 | ++fmt; | |
659 | if (isdigit(*fmt)) | |
660 | precision = skip_atoi(&fmt); | |
661 | else if (*fmt == '*') { | |
662 | ++fmt; | |
663 | /* it's the next argument */ | |
664 | precision = va_arg(args, int); | |
665 | } | |
666 | if (precision < 0) | |
667 | precision = 0; | |
668 | } | |
669 | ||
670 | /* get the conversion qualifier */ | |
671 | qualifier = -1; | |
672 | if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || | |
80322306 | 673 | *fmt =='Z' || *fmt == 'z' || *fmt == 't') { |
1da177e4 LT |
674 | qualifier = *fmt; |
675 | ++fmt; | |
676 | if (qualifier == 'l' && *fmt == 'l') { | |
677 | qualifier = 'L'; | |
678 | ++fmt; | |
679 | } | |
680 | } | |
681 | ||
682 | /* default base */ | |
683 | base = 10; | |
684 | ||
685 | switch (*fmt) { | |
686 | case 'c': | |
687 | if (!(flags & LEFT)) { | |
688 | while (--field_width > 0) { | |
f796937a | 689 | if (str < end) |
1da177e4 LT |
690 | *str = ' '; |
691 | ++str; | |
692 | } | |
693 | } | |
694 | c = (unsigned char) va_arg(args, int); | |
f796937a | 695 | if (str < end) |
1da177e4 LT |
696 | *str = c; |
697 | ++str; | |
698 | while (--field_width > 0) { | |
f796937a | 699 | if (str < end) |
1da177e4 LT |
700 | *str = ' '; |
701 | ++str; | |
702 | } | |
703 | continue; | |
704 | ||
705 | case 's': | |
0f9bfa56 | 706 | str = string(str, end, va_arg(args, char *), field_width, precision, flags); |
1da177e4 LT |
707 | continue; |
708 | ||
709 | case 'p': | |
4d8a743c LT |
710 | str = pointer(fmt+1, str, end, |
711 | va_arg(args, void *), | |
712 | field_width, precision, flags); | |
713 | /* Skip all alphanumeric pointer suffixes */ | |
714 | while (isalnum(fmt[1])) | |
715 | fmt++; | |
1da177e4 LT |
716 | continue; |
717 | ||
1da177e4 LT |
718 | case 'n': |
719 | /* FIXME: | |
720 | * What does C99 say about the overflow case here? */ | |
721 | if (qualifier == 'l') { | |
722 | long * ip = va_arg(args, long *); | |
723 | *ip = (str - buf); | |
724 | } else if (qualifier == 'Z' || qualifier == 'z') { | |
725 | size_t * ip = va_arg(args, size_t *); | |
726 | *ip = (str - buf); | |
727 | } else { | |
728 | int * ip = va_arg(args, int *); | |
729 | *ip = (str - buf); | |
730 | } | |
731 | continue; | |
732 | ||
733 | case '%': | |
f796937a | 734 | if (str < end) |
1da177e4 LT |
735 | *str = '%'; |
736 | ++str; | |
737 | continue; | |
738 | ||
739 | /* integer number formats - set up the flags and "break" */ | |
740 | case 'o': | |
741 | base = 8; | |
742 | break; | |
743 | ||
1da177e4 | 744 | case 'x': |
9b706aee DV |
745 | flags |= SMALL; |
746 | case 'X': | |
1da177e4 LT |
747 | base = 16; |
748 | break; | |
749 | ||
750 | case 'd': | |
751 | case 'i': | |
752 | flags |= SIGN; | |
753 | case 'u': | |
754 | break; | |
755 | ||
756 | default: | |
f796937a | 757 | if (str < end) |
1da177e4 LT |
758 | *str = '%'; |
759 | ++str; | |
760 | if (*fmt) { | |
f796937a | 761 | if (str < end) |
1da177e4 LT |
762 | *str = *fmt; |
763 | ++str; | |
764 | } else { | |
765 | --fmt; | |
766 | } | |
767 | continue; | |
768 | } | |
769 | if (qualifier == 'L') | |
770 | num = va_arg(args, long long); | |
771 | else if (qualifier == 'l') { | |
772 | num = va_arg(args, unsigned long); | |
773 | if (flags & SIGN) | |
774 | num = (signed long) num; | |
775 | } else if (qualifier == 'Z' || qualifier == 'z') { | |
776 | num = va_arg(args, size_t); | |
80322306 AV |
777 | } else if (qualifier == 't') { |
778 | num = va_arg(args, ptrdiff_t); | |
1da177e4 LT |
779 | } else if (qualifier == 'h') { |
780 | num = (unsigned short) va_arg(args, int); | |
781 | if (flags & SIGN) | |
782 | num = (signed short) num; | |
783 | } else { | |
784 | num = va_arg(args, unsigned int); | |
785 | if (flags & SIGN) | |
786 | num = (signed int) num; | |
787 | } | |
788 | str = number(str, end, num, base, | |
789 | field_width, precision, flags); | |
790 | } | |
f796937a JF |
791 | if (size > 0) { |
792 | if (str < end) | |
793 | *str = '\0'; | |
794 | else | |
0a6047ee | 795 | end[-1] = '\0'; |
f796937a JF |
796 | } |
797 | /* the trailing null byte doesn't count towards the total */ | |
1da177e4 LT |
798 | return str-buf; |
799 | } | |
1da177e4 LT |
800 | EXPORT_SYMBOL(vsnprintf); |
801 | ||
802 | /** | |
803 | * vscnprintf - Format a string and place it in a buffer | |
804 | * @buf: The buffer to place the result into | |
805 | * @size: The size of the buffer, including the trailing null space | |
806 | * @fmt: The format string to use | |
807 | * @args: Arguments for the format string | |
808 | * | |
809 | * The return value is the number of characters which have been written into | |
810 | * the @buf not including the trailing '\0'. If @size is <= 0 the function | |
811 | * returns 0. | |
812 | * | |
813 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 814 | * You probably want scnprintf() instead. |
20036fdc AK |
815 | * |
816 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
817 | */ |
818 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
819 | { | |
820 | int i; | |
821 | ||
822 | i=vsnprintf(buf,size,fmt,args); | |
823 | return (i >= size) ? (size - 1) : i; | |
824 | } | |
1da177e4 LT |
825 | EXPORT_SYMBOL(vscnprintf); |
826 | ||
827 | /** | |
828 | * snprintf - Format a string and place it in a buffer | |
829 | * @buf: The buffer to place the result into | |
830 | * @size: The size of the buffer, including the trailing null space | |
831 | * @fmt: The format string to use | |
832 | * @...: Arguments for the format string | |
833 | * | |
834 | * The return value is the number of characters which would be | |
835 | * generated for the given input, excluding the trailing null, | |
836 | * as per ISO C99. If the return is greater than or equal to | |
837 | * @size, the resulting string is truncated. | |
20036fdc AK |
838 | * |
839 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
840 | */ |
841 | int snprintf(char * buf, size_t size, const char *fmt, ...) | |
842 | { | |
843 | va_list args; | |
844 | int i; | |
845 | ||
846 | va_start(args, fmt); | |
847 | i=vsnprintf(buf,size,fmt,args); | |
848 | va_end(args); | |
849 | return i; | |
850 | } | |
1da177e4 LT |
851 | EXPORT_SYMBOL(snprintf); |
852 | ||
853 | /** | |
854 | * scnprintf - Format a string and place it in a buffer | |
855 | * @buf: The buffer to place the result into | |
856 | * @size: The size of the buffer, including the trailing null space | |
857 | * @fmt: The format string to use | |
858 | * @...: Arguments for the format string | |
859 | * | |
860 | * The return value is the number of characters written into @buf not including | |
ea6f3281 | 861 | * the trailing '\0'. If @size is <= 0 the function returns 0. |
1da177e4 LT |
862 | */ |
863 | ||
864 | int scnprintf(char * buf, size_t size, const char *fmt, ...) | |
865 | { | |
866 | va_list args; | |
867 | int i; | |
868 | ||
869 | va_start(args, fmt); | |
870 | i = vsnprintf(buf, size, fmt, args); | |
871 | va_end(args); | |
872 | return (i >= size) ? (size - 1) : i; | |
873 | } | |
874 | EXPORT_SYMBOL(scnprintf); | |
875 | ||
876 | /** | |
877 | * vsprintf - Format a string and place it in a buffer | |
878 | * @buf: The buffer to place the result into | |
879 | * @fmt: The format string to use | |
880 | * @args: Arguments for the format string | |
881 | * | |
882 | * The function returns the number of characters written | |
72fd4a35 | 883 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
884 | * buffer overflows. |
885 | * | |
886 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 887 | * You probably want sprintf() instead. |
20036fdc AK |
888 | * |
889 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
890 | */ |
891 | int vsprintf(char *buf, const char *fmt, va_list args) | |
892 | { | |
893 | return vsnprintf(buf, INT_MAX, fmt, args); | |
894 | } | |
1da177e4 LT |
895 | EXPORT_SYMBOL(vsprintf); |
896 | ||
897 | /** | |
898 | * sprintf - Format a string and place it in a buffer | |
899 | * @buf: The buffer to place the result into | |
900 | * @fmt: The format string to use | |
901 | * @...: Arguments for the format string | |
902 | * | |
903 | * The function returns the number of characters written | |
72fd4a35 | 904 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 | 905 | * buffer overflows. |
20036fdc AK |
906 | * |
907 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
908 | */ |
909 | int sprintf(char * buf, const char *fmt, ...) | |
910 | { | |
911 | va_list args; | |
912 | int i; | |
913 | ||
914 | va_start(args, fmt); | |
915 | i=vsnprintf(buf, INT_MAX, fmt, args); | |
916 | va_end(args); | |
917 | return i; | |
918 | } | |
1da177e4 LT |
919 | EXPORT_SYMBOL(sprintf); |
920 | ||
921 | /** | |
922 | * vsscanf - Unformat a buffer into a list of arguments | |
923 | * @buf: input buffer | |
924 | * @fmt: format of buffer | |
925 | * @args: arguments | |
926 | */ | |
927 | int vsscanf(const char * buf, const char * fmt, va_list args) | |
928 | { | |
929 | const char *str = buf; | |
930 | char *next; | |
931 | char digit; | |
932 | int num = 0; | |
933 | int qualifier; | |
934 | int base; | |
935 | int field_width; | |
936 | int is_sign = 0; | |
937 | ||
938 | while(*fmt && *str) { | |
939 | /* skip any white space in format */ | |
940 | /* white space in format matchs any amount of | |
941 | * white space, including none, in the input. | |
942 | */ | |
943 | if (isspace(*fmt)) { | |
944 | while (isspace(*fmt)) | |
945 | ++fmt; | |
946 | while (isspace(*str)) | |
947 | ++str; | |
948 | } | |
949 | ||
950 | /* anything that is not a conversion must match exactly */ | |
951 | if (*fmt != '%' && *fmt) { | |
952 | if (*fmt++ != *str++) | |
953 | break; | |
954 | continue; | |
955 | } | |
956 | ||
957 | if (!*fmt) | |
958 | break; | |
959 | ++fmt; | |
960 | ||
961 | /* skip this conversion. | |
962 | * advance both strings to next white space | |
963 | */ | |
964 | if (*fmt == '*') { | |
965 | while (!isspace(*fmt) && *fmt) | |
966 | fmt++; | |
967 | while (!isspace(*str) && *str) | |
968 | str++; | |
969 | continue; | |
970 | } | |
971 | ||
972 | /* get field width */ | |
973 | field_width = -1; | |
974 | if (isdigit(*fmt)) | |
975 | field_width = skip_atoi(&fmt); | |
976 | ||
977 | /* get conversion qualifier */ | |
978 | qualifier = -1; | |
979 | if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || | |
980 | *fmt == 'Z' || *fmt == 'z') { | |
981 | qualifier = *fmt++; | |
982 | if (unlikely(qualifier == *fmt)) { | |
983 | if (qualifier == 'h') { | |
984 | qualifier = 'H'; | |
985 | fmt++; | |
986 | } else if (qualifier == 'l') { | |
987 | qualifier = 'L'; | |
988 | fmt++; | |
989 | } | |
990 | } | |
991 | } | |
992 | base = 10; | |
993 | is_sign = 0; | |
994 | ||
995 | if (!*fmt || !*str) | |
996 | break; | |
997 | ||
998 | switch(*fmt++) { | |
999 | case 'c': | |
1000 | { | |
1001 | char *s = (char *) va_arg(args,char*); | |
1002 | if (field_width == -1) | |
1003 | field_width = 1; | |
1004 | do { | |
1005 | *s++ = *str++; | |
1006 | } while (--field_width > 0 && *str); | |
1007 | num++; | |
1008 | } | |
1009 | continue; | |
1010 | case 's': | |
1011 | { | |
1012 | char *s = (char *) va_arg(args, char *); | |
1013 | if(field_width == -1) | |
1014 | field_width = INT_MAX; | |
1015 | /* first, skip leading white space in buffer */ | |
1016 | while (isspace(*str)) | |
1017 | str++; | |
1018 | ||
1019 | /* now copy until next white space */ | |
1020 | while (*str && !isspace(*str) && field_width--) { | |
1021 | *s++ = *str++; | |
1022 | } | |
1023 | *s = '\0'; | |
1024 | num++; | |
1025 | } | |
1026 | continue; | |
1027 | case 'n': | |
1028 | /* return number of characters read so far */ | |
1029 | { | |
1030 | int *i = (int *)va_arg(args,int*); | |
1031 | *i = str - buf; | |
1032 | } | |
1033 | continue; | |
1034 | case 'o': | |
1035 | base = 8; | |
1036 | break; | |
1037 | case 'x': | |
1038 | case 'X': | |
1039 | base = 16; | |
1040 | break; | |
1041 | case 'i': | |
1042 | base = 0; | |
1043 | case 'd': | |
1044 | is_sign = 1; | |
1045 | case 'u': | |
1046 | break; | |
1047 | case '%': | |
1048 | /* looking for '%' in str */ | |
1049 | if (*str++ != '%') | |
1050 | return num; | |
1051 | continue; | |
1052 | default: | |
1053 | /* invalid format; stop here */ | |
1054 | return num; | |
1055 | } | |
1056 | ||
1057 | /* have some sort of integer conversion. | |
1058 | * first, skip white space in buffer. | |
1059 | */ | |
1060 | while (isspace(*str)) | |
1061 | str++; | |
1062 | ||
1063 | digit = *str; | |
1064 | if (is_sign && digit == '-') | |
1065 | digit = *(str + 1); | |
1066 | ||
1067 | if (!digit | |
1068 | || (base == 16 && !isxdigit(digit)) | |
1069 | || (base == 10 && !isdigit(digit)) | |
1070 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
1071 | || (base == 0 && !isdigit(digit))) | |
1072 | break; | |
1073 | ||
1074 | switch(qualifier) { | |
1075 | case 'H': /* that's 'hh' in format */ | |
1076 | if (is_sign) { | |
1077 | signed char *s = (signed char *) va_arg(args,signed char *); | |
1078 | *s = (signed char) simple_strtol(str,&next,base); | |
1079 | } else { | |
1080 | unsigned char *s = (unsigned char *) va_arg(args, unsigned char *); | |
1081 | *s = (unsigned char) simple_strtoul(str, &next, base); | |
1082 | } | |
1083 | break; | |
1084 | case 'h': | |
1085 | if (is_sign) { | |
1086 | short *s = (short *) va_arg(args,short *); | |
1087 | *s = (short) simple_strtol(str,&next,base); | |
1088 | } else { | |
1089 | unsigned short *s = (unsigned short *) va_arg(args, unsigned short *); | |
1090 | *s = (unsigned short) simple_strtoul(str, &next, base); | |
1091 | } | |
1092 | break; | |
1093 | case 'l': | |
1094 | if (is_sign) { | |
1095 | long *l = (long *) va_arg(args,long *); | |
1096 | *l = simple_strtol(str,&next,base); | |
1097 | } else { | |
1098 | unsigned long *l = (unsigned long*) va_arg(args,unsigned long*); | |
1099 | *l = simple_strtoul(str,&next,base); | |
1100 | } | |
1101 | break; | |
1102 | case 'L': | |
1103 | if (is_sign) { | |
1104 | long long *l = (long long*) va_arg(args,long long *); | |
1105 | *l = simple_strtoll(str,&next,base); | |
1106 | } else { | |
1107 | unsigned long long *l = (unsigned long long*) va_arg(args,unsigned long long*); | |
1108 | *l = simple_strtoull(str,&next,base); | |
1109 | } | |
1110 | break; | |
1111 | case 'Z': | |
1112 | case 'z': | |
1113 | { | |
1114 | size_t *s = (size_t*) va_arg(args,size_t*); | |
1115 | *s = (size_t) simple_strtoul(str,&next,base); | |
1116 | } | |
1117 | break; | |
1118 | default: | |
1119 | if (is_sign) { | |
1120 | int *i = (int *) va_arg(args, int*); | |
1121 | *i = (int) simple_strtol(str,&next,base); | |
1122 | } else { | |
1123 | unsigned int *i = (unsigned int*) va_arg(args, unsigned int*); | |
1124 | *i = (unsigned int) simple_strtoul(str,&next,base); | |
1125 | } | |
1126 | break; | |
1127 | } | |
1128 | num++; | |
1129 | ||
1130 | if (!next) | |
1131 | break; | |
1132 | str = next; | |
1133 | } | |
c6b40d16 JB |
1134 | |
1135 | /* | |
1136 | * Now we've come all the way through so either the input string or the | |
1137 | * format ended. In the former case, there can be a %n at the current | |
1138 | * position in the format that needs to be filled. | |
1139 | */ | |
1140 | if (*fmt == '%' && *(fmt + 1) == 'n') { | |
1141 | int *p = (int *)va_arg(args, int *); | |
1142 | *p = str - buf; | |
1143 | } | |
1144 | ||
1da177e4 LT |
1145 | return num; |
1146 | } | |
1da177e4 LT |
1147 | EXPORT_SYMBOL(vsscanf); |
1148 | ||
1149 | /** | |
1150 | * sscanf - Unformat a buffer into a list of arguments | |
1151 | * @buf: input buffer | |
1152 | * @fmt: formatting of buffer | |
1153 | * @...: resulting arguments | |
1154 | */ | |
1155 | int sscanf(const char * buf, const char * fmt, ...) | |
1156 | { | |
1157 | va_list args; | |
1158 | int i; | |
1159 | ||
1160 | va_start(args,fmt); | |
1161 | i = vsscanf(buf,fmt,args); | |
1162 | va_end(args); | |
1163 | return i; | |
1164 | } | |
1da177e4 | 1165 | EXPORT_SYMBOL(sscanf); |