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Commit | Line | Data |
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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> | |
0fe1ef24 LT |
25 | #include <linux/kallsyms.h> |
26 | #include <linux/uaccess.h> | |
332d2e78 | 27 | #include <linux/ioport.h> |
1da177e4 | 28 | |
4e57b681 | 29 | #include <asm/page.h> /* for PAGE_SIZE */ |
1da177e4 | 30 | #include <asm/div64.h> |
deac93df | 31 | #include <asm/sections.h> /* for dereference_function_descriptor() */ |
1da177e4 | 32 | |
9b706aee DV |
33 | /* Works only for digits and letters, but small and fast */ |
34 | #define TOLOWER(x) ((x) | 0x20) | |
35 | ||
aa46a63e HH |
36 | static unsigned int simple_guess_base(const char *cp) |
37 | { | |
38 | if (cp[0] == '0') { | |
39 | if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2])) | |
40 | return 16; | |
41 | else | |
42 | return 8; | |
43 | } else { | |
44 | return 10; | |
45 | } | |
46 | } | |
47 | ||
1da177e4 LT |
48 | /** |
49 | * simple_strtoul - convert a string to an unsigned long | |
50 | * @cp: The start of the string | |
51 | * @endp: A pointer to the end of the parsed string will be placed here | |
52 | * @base: The number base to use | |
53 | */ | |
22d27051 | 54 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
1da177e4 | 55 | { |
aa46a63e HH |
56 | unsigned long result = 0; |
57 | ||
58 | if (!base) | |
59 | base = simple_guess_base(cp); | |
60 | ||
61 | if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x') | |
62 | cp += 2; | |
63 | ||
64 | while (isxdigit(*cp)) { | |
65 | unsigned int value; | |
66 | ||
67 | value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10; | |
68 | if (value >= base) | |
69 | break; | |
70 | result = result * base + value; | |
1da177e4 LT |
71 | cp++; |
72 | } | |
aa46a63e | 73 | |
1da177e4 LT |
74 | if (endp) |
75 | *endp = (char *)cp; | |
76 | return result; | |
77 | } | |
1da177e4 LT |
78 | EXPORT_SYMBOL(simple_strtoul); |
79 | ||
80 | /** | |
81 | * simple_strtol - convert a string to a signed 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 | |
85 | */ | |
22d27051 | 86 | long simple_strtol(const char *cp, char **endp, unsigned int base) |
1da177e4 | 87 | { |
22d27051 HH |
88 | if(*cp == '-') |
89 | return -simple_strtoul(cp + 1, endp, base); | |
90 | return simple_strtoul(cp, endp, base); | |
1da177e4 | 91 | } |
1da177e4 LT |
92 | EXPORT_SYMBOL(simple_strtol); |
93 | ||
94 | /** | |
95 | * simple_strtoull - convert a string to an unsigned long long | |
96 | * @cp: The start of the string | |
97 | * @endp: A pointer to the end of the parsed string will be placed here | |
98 | * @base: The number base to use | |
99 | */ | |
22d27051 | 100 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
1da177e4 | 101 | { |
aa46a63e HH |
102 | unsigned long long result = 0; |
103 | ||
104 | if (!base) | |
105 | base = simple_guess_base(cp); | |
106 | ||
107 | if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x') | |
108 | cp += 2; | |
109 | ||
110 | while (isxdigit(*cp)) { | |
111 | unsigned int value; | |
112 | ||
113 | value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10; | |
114 | if (value >= base) | |
115 | break; | |
116 | result = result * base + value; | |
1da177e4 LT |
117 | cp++; |
118 | } | |
aa46a63e | 119 | |
1da177e4 LT |
120 | if (endp) |
121 | *endp = (char *)cp; | |
122 | return result; | |
123 | } | |
1da177e4 LT |
124 | EXPORT_SYMBOL(simple_strtoull); |
125 | ||
126 | /** | |
127 | * simple_strtoll - convert a string to a signed long long | |
128 | * @cp: The start of the string | |
129 | * @endp: A pointer to the end of the parsed string will be placed here | |
130 | * @base: The number base to use | |
131 | */ | |
22d27051 | 132 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
1da177e4 LT |
133 | { |
134 | if(*cp=='-') | |
22d27051 HH |
135 | return -simple_strtoull(cp + 1, endp, base); |
136 | return simple_strtoull(cp, endp, base); | |
1da177e4 LT |
137 | } |
138 | ||
06b2a76d YY |
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 | */ | |
9d85db22 HH |
161 | int strict_strtoul(const char *cp, unsigned int base, unsigned long *res) |
162 | { | |
163 | char *tail; | |
164 | unsigned long val; | |
165 | size_t len; | |
166 | ||
167 | *res = 0; | |
168 | len = strlen(cp); | |
169 | if (len == 0) | |
170 | return -EINVAL; | |
171 | ||
172 | val = simple_strtoul(cp, &tail, base); | |
e899aa82 PM |
173 | if (tail == cp) |
174 | return -EINVAL; | |
9d85db22 HH |
175 | if ((*tail == '\0') || |
176 | ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) { | |
177 | *res = val; | |
178 | return 0; | |
179 | } | |
180 | ||
181 | return -EINVAL; | |
182 | } | |
183 | EXPORT_SYMBOL(strict_strtoul); | |
06b2a76d YY |
184 | |
185 | /** | |
186 | * strict_strtol - convert a string to a long strictly | |
187 | * @cp: The string to be converted | |
188 | * @base: The number base to use | |
189 | * @res: The converted result value | |
190 | * | |
191 | * strict_strtol is similiar to strict_strtoul, but it allows the first | |
192 | * character of a string is '-'. | |
193 | * | |
194 | * It returns 0 if conversion is successful and *res is set to the converted | |
195 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
196 | */ | |
9d85db22 HH |
197 | int strict_strtol(const char *cp, unsigned int base, long *res) |
198 | { | |
199 | int ret; | |
200 | if (*cp == '-') { | |
201 | ret = strict_strtoul(cp + 1, base, (unsigned long *)res); | |
202 | if (!ret) | |
203 | *res = -(*res); | |
204 | } else { | |
205 | ret = strict_strtoul(cp, base, (unsigned long *)res); | |
206 | } | |
207 | ||
208 | return ret; | |
209 | } | |
210 | EXPORT_SYMBOL(strict_strtol); | |
06b2a76d YY |
211 | |
212 | /** | |
213 | * strict_strtoull - convert a string to an unsigned long long strictly | |
214 | * @cp: The string to be converted | |
215 | * @base: The number base to use | |
216 | * @res: The converted result value | |
217 | * | |
218 | * strict_strtoull converts a string to an unsigned long long only if the | |
219 | * string is really an unsigned long long string, any string containing | |
220 | * any invalid char at the tail will be rejected and -EINVAL is returned, | |
221 | * only a newline char at the tail is acceptible because people generally | |
222 | * change a module parameter in the following way: | |
223 | * | |
224 | * echo 1024 > /sys/module/e1000/parameters/copybreak | |
225 | * | |
226 | * echo will append a newline to the tail of the string. | |
227 | * | |
228 | * It returns 0 if conversion is successful and *res is set to the converted | |
229 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
230 | * | |
231 | * simple_strtoull just ignores the successive invalid characters and | |
232 | * return the converted value of prefix part of the string. | |
233 | */ | |
9d85db22 HH |
234 | int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res) |
235 | { | |
236 | char *tail; | |
237 | unsigned long long val; | |
238 | size_t len; | |
239 | ||
240 | *res = 0; | |
241 | len = strlen(cp); | |
242 | if (len == 0) | |
243 | return -EINVAL; | |
244 | ||
245 | val = simple_strtoull(cp, &tail, base); | |
e899aa82 PM |
246 | if (tail == cp) |
247 | return -EINVAL; | |
9d85db22 HH |
248 | if ((*tail == '\0') || |
249 | ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) { | |
250 | *res = val; | |
251 | return 0; | |
252 | } | |
253 | ||
254 | return -EINVAL; | |
255 | } | |
256 | EXPORT_SYMBOL(strict_strtoull); | |
06b2a76d YY |
257 | |
258 | /** | |
259 | * strict_strtoll - convert a string to a long long strictly | |
260 | * @cp: The string to be converted | |
261 | * @base: The number base to use | |
262 | * @res: The converted result value | |
263 | * | |
264 | * strict_strtoll is similiar to strict_strtoull, but it allows the first | |
265 | * character of a string is '-'. | |
266 | * | |
267 | * It returns 0 if conversion is successful and *res is set to the converted | |
268 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
269 | */ | |
9d85db22 HH |
270 | int strict_strtoll(const char *cp, unsigned int base, long long *res) |
271 | { | |
272 | int ret; | |
273 | if (*cp == '-') { | |
274 | ret = strict_strtoull(cp + 1, base, (unsigned long long *)res); | |
275 | if (!ret) | |
276 | *res = -(*res); | |
277 | } else { | |
278 | ret = strict_strtoull(cp, base, (unsigned long long *)res); | |
279 | } | |
06b2a76d | 280 | |
9d85db22 HH |
281 | return ret; |
282 | } | |
06b2a76d | 283 | EXPORT_SYMBOL(strict_strtoll); |
06b2a76d | 284 | |
1da177e4 LT |
285 | static int skip_atoi(const char **s) |
286 | { | |
287 | int i=0; | |
288 | ||
289 | while (isdigit(**s)) | |
290 | i = i*10 + *((*s)++) - '0'; | |
291 | return i; | |
292 | } | |
293 | ||
4277eedd DV |
294 | /* Decimal conversion is by far the most typical, and is used |
295 | * for /proc and /sys data. This directly impacts e.g. top performance | |
296 | * with many processes running. We optimize it for speed | |
297 | * using code from | |
298 | * http://www.cs.uiowa.edu/~jones/bcd/decimal.html | |
299 | * (with permission from the author, Douglas W. Jones). */ | |
300 | ||
301 | /* Formats correctly any integer in [0,99999]. | |
302 | * Outputs from one to five digits depending on input. | |
303 | * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */ | |
304 | static char* put_dec_trunc(char *buf, unsigned q) | |
305 | { | |
306 | unsigned d3, d2, d1, d0; | |
307 | d1 = (q>>4) & 0xf; | |
308 | d2 = (q>>8) & 0xf; | |
309 | d3 = (q>>12); | |
310 | ||
311 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); | |
312 | q = (d0 * 0xcd) >> 11; | |
313 | d0 = d0 - 10*q; | |
314 | *buf++ = d0 + '0'; /* least significant digit */ | |
315 | d1 = q + 9*d3 + 5*d2 + d1; | |
316 | if (d1 != 0) { | |
317 | q = (d1 * 0xcd) >> 11; | |
318 | d1 = d1 - 10*q; | |
319 | *buf++ = d1 + '0'; /* next digit */ | |
320 | ||
321 | d2 = q + 2*d2; | |
322 | if ((d2 != 0) || (d3 != 0)) { | |
323 | q = (d2 * 0xd) >> 7; | |
324 | d2 = d2 - 10*q; | |
325 | *buf++ = d2 + '0'; /* next digit */ | |
326 | ||
327 | d3 = q + 4*d3; | |
328 | if (d3 != 0) { | |
329 | q = (d3 * 0xcd) >> 11; | |
330 | d3 = d3 - 10*q; | |
331 | *buf++ = d3 + '0'; /* next digit */ | |
332 | if (q != 0) | |
333 | *buf++ = q + '0'; /* most sign. digit */ | |
334 | } | |
335 | } | |
336 | } | |
337 | return buf; | |
338 | } | |
339 | /* Same with if's removed. Always emits five digits */ | |
340 | static char* put_dec_full(char *buf, unsigned q) | |
341 | { | |
342 | /* BTW, if q is in [0,9999], 8-bit ints will be enough, */ | |
343 | /* but anyway, gcc produces better code with full-sized ints */ | |
344 | unsigned d3, d2, d1, d0; | |
345 | d1 = (q>>4) & 0xf; | |
346 | d2 = (q>>8) & 0xf; | |
347 | d3 = (q>>12); | |
348 | ||
349 | /* Possible ways to approx. divide by 10 */ | |
350 | /* gcc -O2 replaces multiply with shifts and adds */ | |
351 | // (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386) | |
352 | // (x * 0x67) >> 10: 1100111 | |
353 | // (x * 0x34) >> 9: 110100 - same | |
354 | // (x * 0x1a) >> 8: 11010 - same | |
355 | // (x * 0x0d) >> 7: 1101 - same, shortest code (on i386) | |
356 | ||
357 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); | |
358 | q = (d0 * 0xcd) >> 11; | |
359 | d0 = d0 - 10*q; | |
360 | *buf++ = d0 + '0'; | |
361 | d1 = q + 9*d3 + 5*d2 + d1; | |
362 | q = (d1 * 0xcd) >> 11; | |
363 | d1 = d1 - 10*q; | |
364 | *buf++ = d1 + '0'; | |
365 | ||
366 | d2 = q + 2*d2; | |
367 | q = (d2 * 0xd) >> 7; | |
368 | d2 = d2 - 10*q; | |
369 | *buf++ = d2 + '0'; | |
370 | ||
371 | d3 = q + 4*d3; | |
372 | q = (d3 * 0xcd) >> 11; /* - shorter code */ | |
373 | /* q = (d3 * 0x67) >> 10; - would also work */ | |
374 | d3 = d3 - 10*q; | |
375 | *buf++ = d3 + '0'; | |
376 | *buf++ = q + '0'; | |
377 | return buf; | |
378 | } | |
379 | /* No inlining helps gcc to use registers better */ | |
380 | static noinline char* put_dec(char *buf, unsigned long long num) | |
381 | { | |
382 | while (1) { | |
383 | unsigned rem; | |
384 | if (num < 100000) | |
385 | return put_dec_trunc(buf, num); | |
386 | rem = do_div(num, 100000); | |
387 | buf = put_dec_full(buf, rem); | |
388 | } | |
389 | } | |
390 | ||
1da177e4 LT |
391 | #define ZEROPAD 1 /* pad with zero */ |
392 | #define SIGN 2 /* unsigned/signed long */ | |
393 | #define PLUS 4 /* show plus */ | |
394 | #define SPACE 8 /* space if plus */ | |
395 | #define LEFT 16 /* left justified */ | |
9b706aee DV |
396 | #define SMALL 32 /* Must be 32 == 0x20 */ |
397 | #define SPECIAL 64 /* 0x */ | |
1da177e4 | 398 | |
fef20d9c FW |
399 | enum format_type { |
400 | FORMAT_TYPE_NONE, /* Just a string part */ | |
ed681a91 | 401 | FORMAT_TYPE_WIDTH, |
fef20d9c FW |
402 | FORMAT_TYPE_PRECISION, |
403 | FORMAT_TYPE_CHAR, | |
404 | FORMAT_TYPE_STR, | |
405 | FORMAT_TYPE_PTR, | |
406 | FORMAT_TYPE_PERCENT_CHAR, | |
407 | FORMAT_TYPE_INVALID, | |
408 | FORMAT_TYPE_LONG_LONG, | |
409 | FORMAT_TYPE_ULONG, | |
410 | FORMAT_TYPE_LONG, | |
a4e94ef0 Z |
411 | FORMAT_TYPE_UBYTE, |
412 | FORMAT_TYPE_BYTE, | |
fef20d9c FW |
413 | FORMAT_TYPE_USHORT, |
414 | FORMAT_TYPE_SHORT, | |
415 | FORMAT_TYPE_UINT, | |
416 | FORMAT_TYPE_INT, | |
417 | FORMAT_TYPE_NRCHARS, | |
418 | FORMAT_TYPE_SIZE_T, | |
419 | FORMAT_TYPE_PTRDIFF | |
420 | }; | |
421 | ||
422 | struct printf_spec { | |
423 | enum format_type type; | |
424 | int flags; /* flags to number() */ | |
425 | int field_width; /* width of output field */ | |
426 | int base; | |
427 | int precision; /* # of digits/chars */ | |
428 | int qualifier; | |
429 | }; | |
430 | ||
431 | static char *number(char *buf, char *end, unsigned long long num, | |
432 | struct printf_spec spec) | |
1da177e4 | 433 | { |
9b706aee DV |
434 | /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ |
435 | static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ | |
436 | ||
437 | char tmp[66]; | |
438 | char sign; | |
439 | char locase; | |
fef20d9c | 440 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
1da177e4 LT |
441 | int i; |
442 | ||
9b706aee DV |
443 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
444 | * produces same digits or (maybe lowercased) letters */ | |
fef20d9c FW |
445 | locase = (spec.flags & SMALL); |
446 | if (spec.flags & LEFT) | |
447 | spec.flags &= ~ZEROPAD; | |
1da177e4 | 448 | sign = 0; |
fef20d9c | 449 | if (spec.flags & SIGN) { |
1da177e4 LT |
450 | if ((signed long long) num < 0) { |
451 | sign = '-'; | |
452 | num = - (signed long long) num; | |
fef20d9c FW |
453 | spec.field_width--; |
454 | } else if (spec.flags & PLUS) { | |
1da177e4 | 455 | sign = '+'; |
fef20d9c FW |
456 | spec.field_width--; |
457 | } else if (spec.flags & SPACE) { | |
1da177e4 | 458 | sign = ' '; |
fef20d9c | 459 | spec.field_width--; |
1da177e4 LT |
460 | } |
461 | } | |
b39a7340 | 462 | if (need_pfx) { |
fef20d9c FW |
463 | spec.field_width--; |
464 | if (spec.base == 16) | |
465 | spec.field_width--; | |
1da177e4 | 466 | } |
b39a7340 DV |
467 | |
468 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 LT |
469 | i = 0; |
470 | if (num == 0) | |
b39a7340 | 471 | tmp[i++] = '0'; |
4277eedd DV |
472 | /* Generic code, for any base: |
473 | else do { | |
9b706aee | 474 | tmp[i++] = (digits[do_div(num,base)] | locase); |
4277eedd DV |
475 | } while (num != 0); |
476 | */ | |
fef20d9c FW |
477 | else if (spec.base != 10) { /* 8 or 16 */ |
478 | int mask = spec.base - 1; | |
b39a7340 | 479 | int shift = 3; |
fef20d9c | 480 | if (spec.base == 16) shift = 4; |
b39a7340 | 481 | do { |
9b706aee | 482 | tmp[i++] = (digits[((unsigned char)num) & mask] | locase); |
b39a7340 DV |
483 | num >>= shift; |
484 | } while (num); | |
4277eedd DV |
485 | } else { /* base 10 */ |
486 | i = put_dec(tmp, num) - tmp; | |
487 | } | |
b39a7340 DV |
488 | |
489 | /* printing 100 using %2d gives "100", not "00" */ | |
fef20d9c FW |
490 | if (i > spec.precision) |
491 | spec.precision = i; | |
b39a7340 | 492 | /* leading space padding */ |
fef20d9c FW |
493 | spec.field_width -= spec.precision; |
494 | if (!(spec.flags & (ZEROPAD+LEFT))) { | |
495 | while(--spec.field_width >= 0) { | |
f796937a | 496 | if (buf < end) |
1da177e4 LT |
497 | *buf = ' '; |
498 | ++buf; | |
499 | } | |
500 | } | |
b39a7340 | 501 | /* sign */ |
1da177e4 | 502 | if (sign) { |
f796937a | 503 | if (buf < end) |
1da177e4 LT |
504 | *buf = sign; |
505 | ++buf; | |
506 | } | |
b39a7340 DV |
507 | /* "0x" / "0" prefix */ |
508 | if (need_pfx) { | |
509 | if (buf < end) | |
510 | *buf = '0'; | |
511 | ++buf; | |
fef20d9c | 512 | if (spec.base == 16) { |
f796937a | 513 | if (buf < end) |
9b706aee | 514 | *buf = ('X' | locase); |
1da177e4 LT |
515 | ++buf; |
516 | } | |
517 | } | |
b39a7340 | 518 | /* zero or space padding */ |
fef20d9c FW |
519 | if (!(spec.flags & LEFT)) { |
520 | char c = (spec.flags & ZEROPAD) ? '0' : ' '; | |
521 | while (--spec.field_width >= 0) { | |
f796937a | 522 | if (buf < end) |
1da177e4 LT |
523 | *buf = c; |
524 | ++buf; | |
525 | } | |
526 | } | |
b39a7340 | 527 | /* hmm even more zero padding? */ |
fef20d9c | 528 | while (i <= --spec.precision) { |
f796937a | 529 | if (buf < end) |
1da177e4 LT |
530 | *buf = '0'; |
531 | ++buf; | |
532 | } | |
b39a7340 DV |
533 | /* actual digits of result */ |
534 | while (--i >= 0) { | |
f796937a | 535 | if (buf < end) |
1da177e4 LT |
536 | *buf = tmp[i]; |
537 | ++buf; | |
538 | } | |
b39a7340 | 539 | /* trailing space padding */ |
fef20d9c | 540 | while (--spec.field_width >= 0) { |
f796937a | 541 | if (buf < end) |
1da177e4 LT |
542 | *buf = ' '; |
543 | ++buf; | |
544 | } | |
545 | return buf; | |
546 | } | |
547 | ||
fef20d9c | 548 | static char *string(char *buf, char *end, char *s, struct printf_spec spec) |
0f9bfa56 LT |
549 | { |
550 | int len, i; | |
551 | ||
552 | if ((unsigned long)s < PAGE_SIZE) | |
553 | s = "<NULL>"; | |
554 | ||
fef20d9c | 555 | len = strnlen(s, spec.precision); |
0f9bfa56 | 556 | |
fef20d9c FW |
557 | if (!(spec.flags & LEFT)) { |
558 | while (len < spec.field_width--) { | |
0f9bfa56 LT |
559 | if (buf < end) |
560 | *buf = ' '; | |
561 | ++buf; | |
562 | } | |
563 | } | |
564 | for (i = 0; i < len; ++i) { | |
565 | if (buf < end) | |
566 | *buf = *s; | |
567 | ++buf; ++s; | |
568 | } | |
fef20d9c | 569 | while (len < spec.field_width--) { |
0f9bfa56 LT |
570 | if (buf < end) |
571 | *buf = ' '; | |
572 | ++buf; | |
573 | } | |
574 | return buf; | |
575 | } | |
576 | ||
fef20d9c FW |
577 | static char *symbol_string(char *buf, char *end, void *ptr, |
578 | struct printf_spec spec) | |
0fe1ef24 LT |
579 | { |
580 | unsigned long value = (unsigned long) ptr; | |
581 | #ifdef CONFIG_KALLSYMS | |
582 | char sym[KSYM_SYMBOL_LEN]; | |
583 | sprint_symbol(sym, value); | |
fef20d9c | 584 | return string(buf, end, sym, spec); |
0fe1ef24 | 585 | #else |
fef20d9c FW |
586 | spec.field_width = 2*sizeof(void *); |
587 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
588 | spec.base = 16; | |
589 | return number(buf, end, value, spec); | |
0fe1ef24 LT |
590 | #endif |
591 | } | |
592 | ||
fef20d9c FW |
593 | static char *resource_string(char *buf, char *end, struct resource *res, |
594 | struct printf_spec spec) | |
332d2e78 LT |
595 | { |
596 | #ifndef IO_RSRC_PRINTK_SIZE | |
597 | #define IO_RSRC_PRINTK_SIZE 4 | |
598 | #endif | |
599 | ||
600 | #ifndef MEM_RSRC_PRINTK_SIZE | |
601 | #define MEM_RSRC_PRINTK_SIZE 8 | |
602 | #endif | |
fef20d9c FW |
603 | struct printf_spec num_spec = { |
604 | .base = 16, | |
605 | .precision = -1, | |
606 | .flags = SPECIAL | SMALL | ZEROPAD, | |
607 | }; | |
332d2e78 LT |
608 | /* room for the actual numbers, the two "0x", -, [, ] and the final zero */ |
609 | char sym[4*sizeof(resource_size_t) + 8]; | |
610 | char *p = sym, *pend = sym + sizeof(sym); | |
611 | int size = -1; | |
612 | ||
613 | if (res->flags & IORESOURCE_IO) | |
614 | size = IO_RSRC_PRINTK_SIZE; | |
615 | else if (res->flags & IORESOURCE_MEM) | |
616 | size = MEM_RSRC_PRINTK_SIZE; | |
617 | ||
618 | *p++ = '['; | |
fef20d9c FW |
619 | num_spec.field_width = size; |
620 | p = number(p, pend, res->start, num_spec); | |
332d2e78 | 621 | *p++ = '-'; |
fef20d9c | 622 | p = number(p, pend, res->end, num_spec); |
332d2e78 LT |
623 | *p++ = ']'; |
624 | *p = 0; | |
625 | ||
fef20d9c | 626 | return string(buf, end, sym, spec); |
332d2e78 LT |
627 | } |
628 | ||
fef20d9c FW |
629 | static char *mac_address_string(char *buf, char *end, u8 *addr, |
630 | struct printf_spec spec) | |
dd45c9cf HH |
631 | { |
632 | char mac_addr[6 * 3]; /* (6 * 2 hex digits), 5 colons and trailing zero */ | |
633 | char *p = mac_addr; | |
634 | int i; | |
635 | ||
636 | for (i = 0; i < 6; i++) { | |
637 | p = pack_hex_byte(p, addr[i]); | |
fef20d9c | 638 | if (!(spec.flags & SPECIAL) && i != 5) |
dd45c9cf HH |
639 | *p++ = ':'; |
640 | } | |
641 | *p = '\0'; | |
fef20d9c | 642 | spec.flags &= ~SPECIAL; |
dd45c9cf | 643 | |
fef20d9c | 644 | return string(buf, end, mac_addr, spec); |
dd45c9cf HH |
645 | } |
646 | ||
fef20d9c FW |
647 | static char *ip6_addr_string(char *buf, char *end, u8 *addr, |
648 | struct printf_spec spec) | |
689afa7d HH |
649 | { |
650 | char ip6_addr[8 * 5]; /* (8 * 4 hex digits), 7 colons and trailing zero */ | |
651 | char *p = ip6_addr; | |
652 | int i; | |
653 | ||
654 | for (i = 0; i < 8; i++) { | |
655 | p = pack_hex_byte(p, addr[2 * i]); | |
656 | p = pack_hex_byte(p, addr[2 * i + 1]); | |
fef20d9c | 657 | if (!(spec.flags & SPECIAL) && i != 7) |
689afa7d HH |
658 | *p++ = ':'; |
659 | } | |
660 | *p = '\0'; | |
fef20d9c | 661 | spec.flags &= ~SPECIAL; |
689afa7d | 662 | |
fef20d9c | 663 | return string(buf, end, ip6_addr, spec); |
689afa7d HH |
664 | } |
665 | ||
fef20d9c FW |
666 | static char *ip4_addr_string(char *buf, char *end, u8 *addr, |
667 | struct printf_spec spec) | |
4aa99606 HH |
668 | { |
669 | char ip4_addr[4 * 4]; /* (4 * 3 decimal digits), 3 dots and trailing zero */ | |
b9ac9985 | 670 | char temp[3]; /* hold each IP quad in reverse order */ |
4aa99606 | 671 | char *p = ip4_addr; |
b9ac9985 | 672 | int i, digits; |
4aa99606 HH |
673 | |
674 | for (i = 0; i < 4; i++) { | |
b9ac9985 HH |
675 | digits = put_dec_trunc(temp, addr[i]) - temp; |
676 | /* reverse the digits in the quad */ | |
677 | while (digits--) | |
678 | *p++ = temp[digits]; | |
4aa99606 HH |
679 | if (i != 3) |
680 | *p++ = '.'; | |
681 | } | |
682 | *p = '\0'; | |
fef20d9c | 683 | spec.flags &= ~SPECIAL; |
4aa99606 | 684 | |
fef20d9c | 685 | return string(buf, end, ip4_addr, spec); |
4aa99606 HH |
686 | } |
687 | ||
4d8a743c LT |
688 | /* |
689 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
690 | * by an extra set of alphanumeric characters that are extended format | |
691 | * specifiers. | |
692 | * | |
332d2e78 LT |
693 | * Right now we handle: |
694 | * | |
695 | * - 'F' For symbolic function descriptor pointers | |
696 | * - 'S' For symbolic direct pointers | |
697 | * - 'R' For a struct resource pointer, it prints the range of | |
698 | * addresses (not the name nor the flags) | |
dd45c9cf HH |
699 | * - 'M' For a 6-byte MAC address, it prints the address in the |
700 | * usual colon-separated hex notation | |
4aa99606 HH |
701 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated |
702 | * decimal for v4 and colon separated network-order 16 bit hex for v6) | |
703 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is | |
6b9a1066 | 704 | * currently the same |
0fe1ef24 | 705 | * |
332d2e78 LT |
706 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 |
707 | * function pointers are really function descriptors, which contain a | |
708 | * pointer to the real address. | |
4d8a743c | 709 | */ |
fef20d9c FW |
710 | static char *pointer(const char *fmt, char *buf, char *end, void *ptr, |
711 | struct printf_spec spec) | |
78a8bf69 | 712 | { |
d97106ab | 713 | if (!ptr) |
fef20d9c | 714 | return string(buf, end, "(null)", spec); |
d97106ab | 715 | |
0fe1ef24 LT |
716 | switch (*fmt) { |
717 | case 'F': | |
718 | ptr = dereference_function_descriptor(ptr); | |
719 | /* Fallthrough */ | |
720 | case 'S': | |
fef20d9c | 721 | return symbol_string(buf, end, ptr, spec); |
332d2e78 | 722 | case 'R': |
fef20d9c | 723 | return resource_string(buf, end, ptr, spec); |
411c41ee | 724 | case 'm': |
fef20d9c | 725 | spec.flags |= SPECIAL; |
411c41ee | 726 | /* Fallthrough */ |
dd45c9cf | 727 | case 'M': |
fef20d9c | 728 | return mac_address_string(buf, end, ptr, spec); |
4aa99606 | 729 | case 'i': |
fef20d9c | 730 | spec.flags |= SPECIAL; |
4aa99606 HH |
731 | /* Fallthrough */ |
732 | case 'I': | |
733 | if (fmt[1] == '6') | |
fef20d9c | 734 | return ip6_addr_string(buf, end, ptr, spec); |
4aa99606 | 735 | if (fmt[1] == '4') |
fef20d9c FW |
736 | return ip4_addr_string(buf, end, ptr, spec); |
737 | spec.flags &= ~SPECIAL; | |
738 | break; | |
739 | } | |
740 | spec.flags |= SMALL; | |
741 | if (spec.field_width == -1) { | |
742 | spec.field_width = 2*sizeof(void *); | |
743 | spec.flags |= ZEROPAD; | |
744 | } | |
745 | spec.base = 16; | |
746 | ||
747 | return number(buf, end, (unsigned long) ptr, spec); | |
748 | } | |
749 | ||
750 | /* | |
751 | * Helper function to decode printf style format. | |
752 | * Each call decode a token from the format and return the | |
753 | * number of characters read (or likely the delta where it wants | |
754 | * to go on the next call). | |
755 | * The decoded token is returned through the parameters | |
756 | * | |
757 | * 'h', 'l', or 'L' for integer fields | |
758 | * 'z' support added 23/7/1999 S.H. | |
759 | * 'z' changed to 'Z' --davidm 1/25/99 | |
760 | * 't' added for ptrdiff_t | |
761 | * | |
762 | * @fmt: the format string | |
763 | * @type of the token returned | |
764 | * @flags: various flags such as +, -, # tokens.. | |
765 | * @field_width: overwritten width | |
766 | * @base: base of the number (octal, hex, ...) | |
767 | * @precision: precision of a number | |
768 | * @qualifier: qualifier of a number (long, size_t, ...) | |
769 | */ | |
770 | static int format_decode(const char *fmt, struct printf_spec *spec) | |
771 | { | |
772 | const char *start = fmt; | |
fef20d9c FW |
773 | |
774 | /* we finished early by reading the field width */ | |
ed681a91 | 775 | if (spec->type == FORMAT_TYPE_WIDTH) { |
fef20d9c FW |
776 | if (spec->field_width < 0) { |
777 | spec->field_width = -spec->field_width; | |
778 | spec->flags |= LEFT; | |
779 | } | |
780 | spec->type = FORMAT_TYPE_NONE; | |
781 | goto precision; | |
782 | } | |
783 | ||
784 | /* we finished early by reading the precision */ | |
785 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
786 | if (spec->precision < 0) | |
787 | spec->precision = 0; | |
788 | ||
789 | spec->type = FORMAT_TYPE_NONE; | |
790 | goto qualifier; | |
791 | } | |
792 | ||
793 | /* By default */ | |
794 | spec->type = FORMAT_TYPE_NONE; | |
795 | ||
796 | for (; *fmt ; ++fmt) { | |
797 | if (*fmt == '%') | |
798 | break; | |
799 | } | |
800 | ||
801 | /* Return the current non-format string */ | |
802 | if (fmt != start || !*fmt) | |
803 | return fmt - start; | |
804 | ||
805 | /* Process flags */ | |
806 | spec->flags = 0; | |
807 | ||
808 | while (1) { /* this also skips first '%' */ | |
809 | bool found = true; | |
810 | ||
811 | ++fmt; | |
812 | ||
813 | switch (*fmt) { | |
814 | case '-': spec->flags |= LEFT; break; | |
815 | case '+': spec->flags |= PLUS; break; | |
816 | case ' ': spec->flags |= SPACE; break; | |
817 | case '#': spec->flags |= SPECIAL; break; | |
818 | case '0': spec->flags |= ZEROPAD; break; | |
819 | default: found = false; | |
820 | } | |
821 | ||
822 | if (!found) | |
823 | break; | |
824 | } | |
825 | ||
826 | /* get field width */ | |
827 | spec->field_width = -1; | |
828 | ||
829 | if (isdigit(*fmt)) | |
830 | spec->field_width = skip_atoi(&fmt); | |
831 | else if (*fmt == '*') { | |
832 | /* it's the next argument */ | |
ed681a91 | 833 | spec->type = FORMAT_TYPE_WIDTH; |
fef20d9c FW |
834 | return ++fmt - start; |
835 | } | |
836 | ||
837 | precision: | |
838 | /* get the precision */ | |
839 | spec->precision = -1; | |
840 | if (*fmt == '.') { | |
841 | ++fmt; | |
842 | if (isdigit(*fmt)) { | |
843 | spec->precision = skip_atoi(&fmt); | |
844 | if (spec->precision < 0) | |
845 | spec->precision = 0; | |
846 | } else if (*fmt == '*') { | |
847 | /* it's the next argument */ | |
adf26f84 | 848 | spec->type = FORMAT_TYPE_PRECISION; |
fef20d9c FW |
849 | return ++fmt - start; |
850 | } | |
851 | } | |
852 | ||
853 | qualifier: | |
854 | /* get the conversion qualifier */ | |
855 | spec->qualifier = -1; | |
856 | if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || | |
857 | *fmt == 'Z' || *fmt == 'z' || *fmt == 't') { | |
a4e94ef0 Z |
858 | spec->qualifier = *fmt++; |
859 | if (unlikely(spec->qualifier == *fmt)) { | |
860 | if (spec->qualifier == 'l') { | |
861 | spec->qualifier = 'L'; | |
862 | ++fmt; | |
863 | } else if (spec->qualifier == 'h') { | |
864 | spec->qualifier = 'H'; | |
865 | ++fmt; | |
866 | } | |
fef20d9c FW |
867 | } |
868 | } | |
869 | ||
870 | /* default base */ | |
871 | spec->base = 10; | |
872 | switch (*fmt) { | |
873 | case 'c': | |
874 | spec->type = FORMAT_TYPE_CHAR; | |
875 | return ++fmt - start; | |
876 | ||
877 | case 's': | |
878 | spec->type = FORMAT_TYPE_STR; | |
879 | return ++fmt - start; | |
880 | ||
881 | case 'p': | |
882 | spec->type = FORMAT_TYPE_PTR; | |
883 | return fmt - start; | |
884 | /* skip alnum */ | |
885 | ||
886 | case 'n': | |
887 | spec->type = FORMAT_TYPE_NRCHARS; | |
888 | return ++fmt - start; | |
889 | ||
890 | case '%': | |
891 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
892 | return ++fmt - start; | |
893 | ||
894 | /* integer number formats - set up the flags and "break" */ | |
895 | case 'o': | |
896 | spec->base = 8; | |
897 | break; | |
898 | ||
899 | case 'x': | |
900 | spec->flags |= SMALL; | |
901 | ||
902 | case 'X': | |
903 | spec->base = 16; | |
904 | break; | |
905 | ||
906 | case 'd': | |
907 | case 'i': | |
39e874f8 | 908 | spec->flags |= SIGN; |
fef20d9c | 909 | case 'u': |
4aa99606 | 910 | break; |
fef20d9c FW |
911 | |
912 | default: | |
913 | spec->type = FORMAT_TYPE_INVALID; | |
914 | return fmt - start; | |
0fe1ef24 | 915 | } |
fef20d9c FW |
916 | |
917 | if (spec->qualifier == 'L') | |
918 | spec->type = FORMAT_TYPE_LONG_LONG; | |
919 | else if (spec->qualifier == 'l') { | |
39e874f8 | 920 | if (spec->flags & SIGN) |
fef20d9c FW |
921 | spec->type = FORMAT_TYPE_LONG; |
922 | else | |
923 | spec->type = FORMAT_TYPE_ULONG; | |
924 | } else if (spec->qualifier == 'Z' || spec->qualifier == 'z') { | |
925 | spec->type = FORMAT_TYPE_SIZE_T; | |
926 | } else if (spec->qualifier == 't') { | |
927 | spec->type = FORMAT_TYPE_PTRDIFF; | |
a4e94ef0 Z |
928 | } else if (spec->qualifier == 'H') { |
929 | if (spec->flags & SIGN) | |
930 | spec->type = FORMAT_TYPE_BYTE; | |
931 | else | |
932 | spec->type = FORMAT_TYPE_UBYTE; | |
fef20d9c | 933 | } else if (spec->qualifier == 'h') { |
39e874f8 | 934 | if (spec->flags & SIGN) |
fef20d9c FW |
935 | spec->type = FORMAT_TYPE_SHORT; |
936 | else | |
937 | spec->type = FORMAT_TYPE_USHORT; | |
938 | } else { | |
39e874f8 | 939 | if (spec->flags & SIGN) |
fef20d9c FW |
940 | spec->type = FORMAT_TYPE_INT; |
941 | else | |
942 | spec->type = FORMAT_TYPE_UINT; | |
78a8bf69 | 943 | } |
fef20d9c FW |
944 | |
945 | return ++fmt - start; | |
78a8bf69 LT |
946 | } |
947 | ||
1da177e4 LT |
948 | /** |
949 | * vsnprintf - Format a string and place it in a buffer | |
950 | * @buf: The buffer to place the result into | |
951 | * @size: The size of the buffer, including the trailing null space | |
952 | * @fmt: The format string to use | |
953 | * @args: Arguments for the format string | |
954 | * | |
20036fdc AK |
955 | * This function follows C99 vsnprintf, but has some extensions: |
956 | * %pS output the name of a text symbol | |
957 | * %pF output the name of a function pointer | |
332d2e78 | 958 | * %pR output the address range in a struct resource |
20036fdc | 959 | * |
1da177e4 LT |
960 | * The return value is the number of characters which would |
961 | * be generated for the given input, excluding the trailing | |
962 | * '\0', as per ISO C99. If you want to have the exact | |
963 | * number of characters written into @buf as return value | |
72fd4a35 | 964 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
965 | * return is greater than or equal to @size, the resulting |
966 | * string is truncated. | |
967 | * | |
968 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 969 | * You probably want snprintf() instead. |
1da177e4 LT |
970 | */ |
971 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
972 | { | |
1da177e4 | 973 | unsigned long long num; |
1da177e4 | 974 | char *str, *end, c; |
fef20d9c FW |
975 | int read; |
976 | struct printf_spec spec = {0}; | |
1da177e4 | 977 | |
f796937a JF |
978 | /* Reject out-of-range values early. Large positive sizes are |
979 | used for unknown buffer sizes. */ | |
1da177e4 LT |
980 | if (unlikely((int) size < 0)) { |
981 | /* There can be only one.. */ | |
b39a7340 | 982 | static char warn = 1; |
1da177e4 LT |
983 | WARN_ON(warn); |
984 | warn = 0; | |
985 | return 0; | |
986 | } | |
987 | ||
988 | str = buf; | |
f796937a | 989 | end = buf + size; |
1da177e4 | 990 | |
f796937a JF |
991 | /* Make sure end is always >= buf */ |
992 | if (end < buf) { | |
993 | end = ((void *)-1); | |
994 | size = end - buf; | |
1da177e4 LT |
995 | } |
996 | ||
fef20d9c FW |
997 | while (*fmt) { |
998 | const char *old_fmt = fmt; | |
1da177e4 | 999 | |
fef20d9c | 1000 | read = format_decode(fmt, &spec); |
1da177e4 | 1001 | |
fef20d9c | 1002 | fmt += read; |
1da177e4 | 1003 | |
fef20d9c FW |
1004 | switch (spec.type) { |
1005 | case FORMAT_TYPE_NONE: { | |
1006 | int copy = read; | |
1007 | if (str < end) { | |
1008 | if (copy > end - str) | |
1009 | copy = end - str; | |
1010 | memcpy(str, old_fmt, copy); | |
1da177e4 | 1011 | } |
fef20d9c FW |
1012 | str += read; |
1013 | break; | |
1da177e4 LT |
1014 | } |
1015 | ||
ed681a91 | 1016 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1017 | spec.field_width = va_arg(args, int); |
1018 | break; | |
1da177e4 | 1019 | |
fef20d9c FW |
1020 | case FORMAT_TYPE_PRECISION: |
1021 | spec.precision = va_arg(args, int); | |
1022 | break; | |
1da177e4 | 1023 | |
fef20d9c FW |
1024 | case FORMAT_TYPE_CHAR: |
1025 | if (!(spec.flags & LEFT)) { | |
1026 | while (--spec.field_width > 0) { | |
f796937a | 1027 | if (str < end) |
1da177e4 LT |
1028 | *str = ' '; |
1029 | ++str; | |
1da177e4 | 1030 | |
fef20d9c FW |
1031 | } |
1032 | } | |
1033 | c = (unsigned char) va_arg(args, int); | |
1034 | if (str < end) | |
1035 | *str = c; | |
1036 | ++str; | |
1037 | while (--spec.field_width > 0) { | |
f796937a | 1038 | if (str < end) |
fef20d9c | 1039 | *str = ' '; |
1da177e4 | 1040 | ++str; |
fef20d9c FW |
1041 | } |
1042 | break; | |
1da177e4 | 1043 | |
fef20d9c FW |
1044 | case FORMAT_TYPE_STR: |
1045 | str = string(str, end, va_arg(args, char *), spec); | |
1046 | break; | |
1da177e4 | 1047 | |
fef20d9c FW |
1048 | case FORMAT_TYPE_PTR: |
1049 | str = pointer(fmt+1, str, end, va_arg(args, void *), | |
1050 | spec); | |
1051 | while (isalnum(*fmt)) | |
1052 | fmt++; | |
1053 | break; | |
1da177e4 | 1054 | |
fef20d9c FW |
1055 | case FORMAT_TYPE_PERCENT_CHAR: |
1056 | if (str < end) | |
1057 | *str = '%'; | |
1058 | ++str; | |
1059 | break; | |
1da177e4 | 1060 | |
fef20d9c FW |
1061 | case FORMAT_TYPE_INVALID: |
1062 | if (str < end) | |
1063 | *str = '%'; | |
1064 | ++str; | |
fef20d9c FW |
1065 | break; |
1066 | ||
1067 | case FORMAT_TYPE_NRCHARS: { | |
1068 | int qualifier = spec.qualifier; | |
1069 | ||
1070 | if (qualifier == 'l') { | |
1071 | long *ip = va_arg(args, long *); | |
1072 | *ip = (str - buf); | |
1073 | } else if (qualifier == 'Z' || | |
1074 | qualifier == 'z') { | |
1075 | size_t *ip = va_arg(args, size_t *); | |
1076 | *ip = (str - buf); | |
1077 | } else { | |
1078 | int *ip = va_arg(args, int *); | |
1079 | *ip = (str - buf); | |
1080 | } | |
1081 | break; | |
1da177e4 | 1082 | } |
fef20d9c FW |
1083 | |
1084 | default: | |
1085 | switch (spec.type) { | |
1086 | case FORMAT_TYPE_LONG_LONG: | |
1087 | num = va_arg(args, long long); | |
1088 | break; | |
1089 | case FORMAT_TYPE_ULONG: | |
1090 | num = va_arg(args, unsigned long); | |
1091 | break; | |
1092 | case FORMAT_TYPE_LONG: | |
1093 | num = va_arg(args, long); | |
1094 | break; | |
1095 | case FORMAT_TYPE_SIZE_T: | |
1096 | num = va_arg(args, size_t); | |
1097 | break; | |
1098 | case FORMAT_TYPE_PTRDIFF: | |
1099 | num = va_arg(args, ptrdiff_t); | |
1100 | break; | |
a4e94ef0 Z |
1101 | case FORMAT_TYPE_UBYTE: |
1102 | num = (unsigned char) va_arg(args, int); | |
1103 | break; | |
1104 | case FORMAT_TYPE_BYTE: | |
1105 | num = (signed char) va_arg(args, int); | |
1106 | break; | |
fef20d9c FW |
1107 | case FORMAT_TYPE_USHORT: |
1108 | num = (unsigned short) va_arg(args, int); | |
1109 | break; | |
1110 | case FORMAT_TYPE_SHORT: | |
1111 | num = (short) va_arg(args, int); | |
1112 | break; | |
39e874f8 FW |
1113 | case FORMAT_TYPE_INT: |
1114 | num = (int) va_arg(args, int); | |
fef20d9c FW |
1115 | break; |
1116 | default: | |
1117 | num = va_arg(args, unsigned int); | |
1118 | } | |
1119 | ||
1120 | str = number(str, end, num, spec); | |
1da177e4 | 1121 | } |
1da177e4 | 1122 | } |
fef20d9c | 1123 | |
f796937a JF |
1124 | if (size > 0) { |
1125 | if (str < end) | |
1126 | *str = '\0'; | |
1127 | else | |
0a6047ee | 1128 | end[-1] = '\0'; |
f796937a | 1129 | } |
fef20d9c | 1130 | |
f796937a | 1131 | /* the trailing null byte doesn't count towards the total */ |
1da177e4 | 1132 | return str-buf; |
fef20d9c | 1133 | |
1da177e4 | 1134 | } |
1da177e4 LT |
1135 | EXPORT_SYMBOL(vsnprintf); |
1136 | ||
1137 | /** | |
1138 | * vscnprintf - Format a string and place it in a buffer | |
1139 | * @buf: The buffer to place the result into | |
1140 | * @size: The size of the buffer, including the trailing null space | |
1141 | * @fmt: The format string to use | |
1142 | * @args: Arguments for the format string | |
1143 | * | |
1144 | * The return value is the number of characters which have been written into | |
1145 | * the @buf not including the trailing '\0'. If @size is <= 0 the function | |
1146 | * returns 0. | |
1147 | * | |
1148 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 1149 | * You probably want scnprintf() instead. |
20036fdc AK |
1150 | * |
1151 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1152 | */ |
1153 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1154 | { | |
1155 | int i; | |
1156 | ||
1157 | i=vsnprintf(buf,size,fmt,args); | |
1158 | return (i >= size) ? (size - 1) : i; | |
1159 | } | |
1da177e4 LT |
1160 | EXPORT_SYMBOL(vscnprintf); |
1161 | ||
1162 | /** | |
1163 | * snprintf - Format a string and place it in a buffer | |
1164 | * @buf: The buffer to place the result into | |
1165 | * @size: The size of the buffer, including the trailing null space | |
1166 | * @fmt: The format string to use | |
1167 | * @...: Arguments for the format string | |
1168 | * | |
1169 | * The return value is the number of characters which would be | |
1170 | * generated for the given input, excluding the trailing null, | |
1171 | * as per ISO C99. If the return is greater than or equal to | |
1172 | * @size, the resulting string is truncated. | |
20036fdc AK |
1173 | * |
1174 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1175 | */ |
1176 | int snprintf(char * buf, size_t size, const char *fmt, ...) | |
1177 | { | |
1178 | va_list args; | |
1179 | int i; | |
1180 | ||
1181 | va_start(args, fmt); | |
1182 | i=vsnprintf(buf,size,fmt,args); | |
1183 | va_end(args); | |
1184 | return i; | |
1185 | } | |
1da177e4 LT |
1186 | EXPORT_SYMBOL(snprintf); |
1187 | ||
1188 | /** | |
1189 | * scnprintf - Format a string and place it in a buffer | |
1190 | * @buf: The buffer to place the result into | |
1191 | * @size: The size of the buffer, including the trailing null space | |
1192 | * @fmt: The format string to use | |
1193 | * @...: Arguments for the format string | |
1194 | * | |
1195 | * The return value is the number of characters written into @buf not including | |
ea6f3281 | 1196 | * the trailing '\0'. If @size is <= 0 the function returns 0. |
1da177e4 LT |
1197 | */ |
1198 | ||
1199 | int scnprintf(char * buf, size_t size, const char *fmt, ...) | |
1200 | { | |
1201 | va_list args; | |
1202 | int i; | |
1203 | ||
1204 | va_start(args, fmt); | |
1205 | i = vsnprintf(buf, size, fmt, args); | |
1206 | va_end(args); | |
1207 | return (i >= size) ? (size - 1) : i; | |
1208 | } | |
1209 | EXPORT_SYMBOL(scnprintf); | |
1210 | ||
1211 | /** | |
1212 | * vsprintf - Format a string and place it in a buffer | |
1213 | * @buf: The buffer to place the result into | |
1214 | * @fmt: The format string to use | |
1215 | * @args: Arguments for the format string | |
1216 | * | |
1217 | * The function returns the number of characters written | |
72fd4a35 | 1218 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
1219 | * buffer overflows. |
1220 | * | |
1221 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 1222 | * You probably want sprintf() instead. |
20036fdc AK |
1223 | * |
1224 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1225 | */ |
1226 | int vsprintf(char *buf, const char *fmt, va_list args) | |
1227 | { | |
1228 | return vsnprintf(buf, INT_MAX, fmt, args); | |
1229 | } | |
1da177e4 LT |
1230 | EXPORT_SYMBOL(vsprintf); |
1231 | ||
1232 | /** | |
1233 | * sprintf - Format a string and place it in a buffer | |
1234 | * @buf: The buffer to place the result into | |
1235 | * @fmt: The format string to use | |
1236 | * @...: Arguments for the format string | |
1237 | * | |
1238 | * The function returns the number of characters written | |
72fd4a35 | 1239 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 | 1240 | * buffer overflows. |
20036fdc AK |
1241 | * |
1242 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1243 | */ |
1244 | int sprintf(char * buf, const char *fmt, ...) | |
1245 | { | |
1246 | va_list args; | |
1247 | int i; | |
1248 | ||
1249 | va_start(args, fmt); | |
1250 | i=vsnprintf(buf, INT_MAX, fmt, args); | |
1251 | va_end(args); | |
1252 | return i; | |
1253 | } | |
1da177e4 LT |
1254 | EXPORT_SYMBOL(sprintf); |
1255 | ||
4370aa4a LJ |
1256 | #ifdef CONFIG_BINARY_PRINTF |
1257 | /* | |
1258 | * bprintf service: | |
1259 | * vbin_printf() - VA arguments to binary data | |
1260 | * bstr_printf() - Binary data to text string | |
1261 | */ | |
1262 | ||
1263 | /** | |
1264 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
1265 | * @bin_buf: The buffer to place args' binary value | |
1266 | * @size: The size of the buffer(by words(32bits), not characters) | |
1267 | * @fmt: The format string to use | |
1268 | * @args: Arguments for the format string | |
1269 | * | |
1270 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
1271 | * is skiped. | |
1272 | * | |
1273 | * The return value is the number of words(32bits) which would be generated for | |
1274 | * the given input. | |
1275 | * | |
1276 | * NOTE: | |
1277 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
1278 | * valid for bstr_printf(). | |
1279 | */ | |
1280 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
1281 | { | |
fef20d9c | 1282 | struct printf_spec spec = {0}; |
4370aa4a | 1283 | char *str, *end; |
fef20d9c | 1284 | int read; |
4370aa4a LJ |
1285 | |
1286 | str = (char *)bin_buf; | |
1287 | end = (char *)(bin_buf + size); | |
1288 | ||
1289 | #define save_arg(type) \ | |
1290 | do { \ | |
1291 | if (sizeof(type) == 8) { \ | |
1292 | unsigned long long value; \ | |
1293 | str = PTR_ALIGN(str, sizeof(u32)); \ | |
1294 | value = va_arg(args, unsigned long long); \ | |
1295 | if (str + sizeof(type) <= end) { \ | |
1296 | *(u32 *)str = *(u32 *)&value; \ | |
1297 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ | |
1298 | } \ | |
1299 | } else { \ | |
1300 | unsigned long value; \ | |
1301 | str = PTR_ALIGN(str, sizeof(type)); \ | |
1302 | value = va_arg(args, int); \ | |
1303 | if (str + sizeof(type) <= end) \ | |
1304 | *(typeof(type) *)str = (type)value; \ | |
1305 | } \ | |
1306 | str += sizeof(type); \ | |
1307 | } while (0) | |
1308 | ||
4370aa4a | 1309 | |
fef20d9c FW |
1310 | while (*fmt) { |
1311 | read = format_decode(fmt, &spec); | |
4370aa4a | 1312 | |
fef20d9c | 1313 | fmt += read; |
4370aa4a | 1314 | |
fef20d9c FW |
1315 | switch (spec.type) { |
1316 | case FORMAT_TYPE_NONE: | |
1317 | break; | |
1318 | ||
ed681a91 | 1319 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1320 | case FORMAT_TYPE_PRECISION: |
1321 | save_arg(int); | |
1322 | break; | |
1323 | ||
1324 | case FORMAT_TYPE_CHAR: | |
4370aa4a | 1325 | save_arg(char); |
fef20d9c FW |
1326 | break; |
1327 | ||
1328 | case FORMAT_TYPE_STR: { | |
4370aa4a LJ |
1329 | const char *save_str = va_arg(args, char *); |
1330 | size_t len; | |
1331 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE | |
1332 | || (unsigned long)save_str < PAGE_SIZE) | |
1333 | save_str = "<NULL>"; | |
1334 | len = strlen(save_str); | |
1335 | if (str + len + 1 < end) | |
1336 | memcpy(str, save_str, len + 1); | |
1337 | str += len + 1; | |
fef20d9c | 1338 | break; |
4370aa4a | 1339 | } |
fef20d9c FW |
1340 | |
1341 | case FORMAT_TYPE_PTR: | |
4370aa4a LJ |
1342 | save_arg(void *); |
1343 | /* skip all alphanumeric pointer suffixes */ | |
fef20d9c | 1344 | while (isalnum(*fmt)) |
4370aa4a | 1345 | fmt++; |
fef20d9c FW |
1346 | break; |
1347 | ||
1348 | case FORMAT_TYPE_PERCENT_CHAR: | |
1349 | break; | |
1350 | ||
1351 | case FORMAT_TYPE_INVALID: | |
fef20d9c FW |
1352 | break; |
1353 | ||
1354 | case FORMAT_TYPE_NRCHARS: { | |
4370aa4a | 1355 | /* skip %n 's argument */ |
fef20d9c | 1356 | int qualifier = spec.qualifier; |
4370aa4a LJ |
1357 | void *skip_arg; |
1358 | if (qualifier == 'l') | |
1359 | skip_arg = va_arg(args, long *); | |
1360 | else if (qualifier == 'Z' || qualifier == 'z') | |
1361 | skip_arg = va_arg(args, size_t *); | |
1362 | else | |
1363 | skip_arg = va_arg(args, int *); | |
fef20d9c | 1364 | break; |
4370aa4a | 1365 | } |
fef20d9c FW |
1366 | |
1367 | default: | |
1368 | switch (spec.type) { | |
1369 | ||
1370 | case FORMAT_TYPE_LONG_LONG: | |
4370aa4a | 1371 | save_arg(long long); |
fef20d9c FW |
1372 | break; |
1373 | case FORMAT_TYPE_ULONG: | |
1374 | case FORMAT_TYPE_LONG: | |
4370aa4a | 1375 | save_arg(unsigned long); |
fef20d9c FW |
1376 | break; |
1377 | case FORMAT_TYPE_SIZE_T: | |
4370aa4a | 1378 | save_arg(size_t); |
fef20d9c FW |
1379 | break; |
1380 | case FORMAT_TYPE_PTRDIFF: | |
4370aa4a | 1381 | save_arg(ptrdiff_t); |
fef20d9c | 1382 | break; |
a4e94ef0 Z |
1383 | case FORMAT_TYPE_UBYTE: |
1384 | case FORMAT_TYPE_BYTE: | |
1385 | save_arg(char); | |
1386 | break; | |
fef20d9c FW |
1387 | case FORMAT_TYPE_USHORT: |
1388 | case FORMAT_TYPE_SHORT: | |
4370aa4a | 1389 | save_arg(short); |
fef20d9c FW |
1390 | break; |
1391 | default: | |
4370aa4a | 1392 | save_arg(int); |
fef20d9c | 1393 | } |
4370aa4a LJ |
1394 | } |
1395 | } | |
4370aa4a | 1396 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
fef20d9c FW |
1397 | |
1398 | #undef save_arg | |
4370aa4a LJ |
1399 | } |
1400 | EXPORT_SYMBOL_GPL(vbin_printf); | |
1401 | ||
1402 | /** | |
1403 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
1404 | * @buf: The buffer to place the result into | |
1405 | * @size: The size of the buffer, including the trailing null space | |
1406 | * @fmt: The format string to use | |
1407 | * @bin_buf: Binary arguments for the format string | |
1408 | * | |
1409 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
1410 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
1411 | * a binary buffer that generated by vbin_printf. | |
1412 | * | |
1413 | * The format follows C99 vsnprintf, but has some extensions: | |
1414 | * %pS output the name of a text symbol | |
1415 | * %pF output the name of a function pointer | |
1416 | * %pR output the address range in a struct resource | |
1417 | * %n is ignored | |
1418 | * | |
1419 | * The return value is the number of characters which would | |
1420 | * be generated for the given input, excluding the trailing | |
1421 | * '\0', as per ISO C99. If you want to have the exact | |
1422 | * number of characters written into @buf as return value | |
1423 | * (not including the trailing '\0'), use vscnprintf(). If the | |
1424 | * return is greater than or equal to @size, the resulting | |
1425 | * string is truncated. | |
1426 | */ | |
1427 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
1428 | { | |
1429 | unsigned long long num; | |
4370aa4a LJ |
1430 | char *str, *end, c; |
1431 | const char *args = (const char *)bin_buf; | |
1432 | ||
fef20d9c | 1433 | struct printf_spec spec = {0}; |
4370aa4a LJ |
1434 | |
1435 | if (unlikely((int) size < 0)) { | |
1436 | /* There can be only one.. */ | |
1437 | static char warn = 1; | |
1438 | WARN_ON(warn); | |
1439 | warn = 0; | |
1440 | return 0; | |
1441 | } | |
1442 | ||
1443 | str = buf; | |
1444 | end = buf + size; | |
1445 | ||
1446 | #define get_arg(type) \ | |
1447 | ({ \ | |
1448 | typeof(type) value; \ | |
1449 | if (sizeof(type) == 8) { \ | |
1450 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
1451 | *(u32 *)&value = *(u32 *)args; \ | |
1452 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
1453 | } else { \ | |
1454 | args = PTR_ALIGN(args, sizeof(type)); \ | |
1455 | value = *(typeof(type) *)args; \ | |
1456 | } \ | |
1457 | args += sizeof(type); \ | |
1458 | value; \ | |
1459 | }) | |
1460 | ||
1461 | /* Make sure end is always >= buf */ | |
1462 | if (end < buf) { | |
1463 | end = ((void *)-1); | |
1464 | size = end - buf; | |
1465 | } | |
1466 | ||
fef20d9c FW |
1467 | while (*fmt) { |
1468 | int read; | |
1469 | const char *old_fmt = fmt; | |
4370aa4a | 1470 | |
fef20d9c | 1471 | read = format_decode(fmt, &spec); |
4370aa4a | 1472 | |
fef20d9c | 1473 | fmt += read; |
4370aa4a | 1474 | |
fef20d9c FW |
1475 | switch (spec.type) { |
1476 | case FORMAT_TYPE_NONE: { | |
1477 | int copy = read; | |
1478 | if (str < end) { | |
1479 | if (copy > end - str) | |
1480 | copy = end - str; | |
1481 | memcpy(str, old_fmt, copy); | |
4370aa4a | 1482 | } |
fef20d9c FW |
1483 | str += read; |
1484 | break; | |
4370aa4a LJ |
1485 | } |
1486 | ||
ed681a91 | 1487 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1488 | spec.field_width = get_arg(int); |
1489 | break; | |
4370aa4a | 1490 | |
fef20d9c FW |
1491 | case FORMAT_TYPE_PRECISION: |
1492 | spec.precision = get_arg(int); | |
1493 | break; | |
4370aa4a | 1494 | |
fef20d9c FW |
1495 | case FORMAT_TYPE_CHAR: |
1496 | if (!(spec.flags & LEFT)) { | |
1497 | while (--spec.field_width > 0) { | |
4370aa4a LJ |
1498 | if (str < end) |
1499 | *str = ' '; | |
1500 | ++str; | |
1501 | } | |
1502 | } | |
1503 | c = (unsigned char) get_arg(char); | |
1504 | if (str < end) | |
1505 | *str = c; | |
1506 | ++str; | |
fef20d9c | 1507 | while (--spec.field_width > 0) { |
4370aa4a LJ |
1508 | if (str < end) |
1509 | *str = ' '; | |
1510 | ++str; | |
1511 | } | |
fef20d9c | 1512 | break; |
4370aa4a | 1513 | |
fef20d9c | 1514 | case FORMAT_TYPE_STR: { |
4370aa4a LJ |
1515 | const char *str_arg = args; |
1516 | size_t len = strlen(str_arg); | |
1517 | args += len + 1; | |
fef20d9c FW |
1518 | str = string(str, end, (char *)str_arg, spec); |
1519 | break; | |
4370aa4a LJ |
1520 | } |
1521 | ||
fef20d9c FW |
1522 | case FORMAT_TYPE_PTR: |
1523 | str = pointer(fmt+1, str, end, get_arg(void *), spec); | |
1524 | while (isalnum(*fmt)) | |
4370aa4a | 1525 | fmt++; |
fef20d9c | 1526 | break; |
4370aa4a | 1527 | |
fef20d9c | 1528 | case FORMAT_TYPE_PERCENT_CHAR: |
4370aa4a LJ |
1529 | if (str < end) |
1530 | *str = '%'; | |
1531 | ++str; | |
4370aa4a LJ |
1532 | break; |
1533 | ||
fef20d9c | 1534 | case FORMAT_TYPE_INVALID: |
4370aa4a LJ |
1535 | if (str < end) |
1536 | *str = '%'; | |
1537 | ++str; | |
fef20d9c FW |
1538 | break; |
1539 | ||
1540 | case FORMAT_TYPE_NRCHARS: | |
1541 | /* skip */ | |
1542 | break; | |
1543 | ||
1544 | default: | |
1545 | switch (spec.type) { | |
1546 | ||
1547 | case FORMAT_TYPE_LONG_LONG: | |
1548 | num = get_arg(long long); | |
1549 | break; | |
1550 | case FORMAT_TYPE_ULONG: | |
1551 | num = get_arg(unsigned long); | |
1552 | break; | |
1553 | case FORMAT_TYPE_LONG: | |
1554 | num = get_arg(unsigned long); | |
1555 | break; | |
1556 | case FORMAT_TYPE_SIZE_T: | |
1557 | num = get_arg(size_t); | |
1558 | break; | |
1559 | case FORMAT_TYPE_PTRDIFF: | |
1560 | num = get_arg(ptrdiff_t); | |
1561 | break; | |
a4e94ef0 Z |
1562 | case FORMAT_TYPE_UBYTE: |
1563 | num = get_arg(unsigned char); | |
1564 | break; | |
1565 | case FORMAT_TYPE_BYTE: | |
1566 | num = get_arg(signed char); | |
1567 | break; | |
fef20d9c FW |
1568 | case FORMAT_TYPE_USHORT: |
1569 | num = get_arg(unsigned short); | |
1570 | break; | |
1571 | case FORMAT_TYPE_SHORT: | |
1572 | num = get_arg(short); | |
1573 | break; | |
1574 | case FORMAT_TYPE_UINT: | |
1575 | num = get_arg(unsigned int); | |
1576 | break; | |
1577 | default: | |
1578 | num = get_arg(int); | |
1579 | } | |
1580 | ||
1581 | str = number(str, end, num, spec); | |
4370aa4a | 1582 | } |
4370aa4a | 1583 | } |
fef20d9c | 1584 | |
4370aa4a LJ |
1585 | if (size > 0) { |
1586 | if (str < end) | |
1587 | *str = '\0'; | |
1588 | else | |
1589 | end[-1] = '\0'; | |
1590 | } | |
fef20d9c | 1591 | |
4370aa4a LJ |
1592 | #undef get_arg |
1593 | ||
1594 | /* the trailing null byte doesn't count towards the total */ | |
1595 | return str - buf; | |
1596 | } | |
1597 | EXPORT_SYMBOL_GPL(bstr_printf); | |
1598 | ||
1599 | /** | |
1600 | * bprintf - Parse a format string and place args' binary value in a buffer | |
1601 | * @bin_buf: The buffer to place args' binary value | |
1602 | * @size: The size of the buffer(by words(32bits), not characters) | |
1603 | * @fmt: The format string to use | |
1604 | * @...: Arguments for the format string | |
1605 | * | |
1606 | * The function returns the number of words(u32) written | |
1607 | * into @bin_buf. | |
1608 | */ | |
1609 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
1610 | { | |
1611 | va_list args; | |
1612 | int ret; | |
1613 | ||
1614 | va_start(args, fmt); | |
1615 | ret = vbin_printf(bin_buf, size, fmt, args); | |
1616 | va_end(args); | |
1617 | return ret; | |
1618 | } | |
1619 | EXPORT_SYMBOL_GPL(bprintf); | |
1620 | ||
1621 | #endif /* CONFIG_BINARY_PRINTF */ | |
1622 | ||
1da177e4 LT |
1623 | /** |
1624 | * vsscanf - Unformat a buffer into a list of arguments | |
1625 | * @buf: input buffer | |
1626 | * @fmt: format of buffer | |
1627 | * @args: arguments | |
1628 | */ | |
1629 | int vsscanf(const char * buf, const char * fmt, va_list args) | |
1630 | { | |
1631 | const char *str = buf; | |
1632 | char *next; | |
1633 | char digit; | |
1634 | int num = 0; | |
1635 | int qualifier; | |
1636 | int base; | |
1637 | int field_width; | |
1638 | int is_sign = 0; | |
1639 | ||
1640 | while(*fmt && *str) { | |
1641 | /* skip any white space in format */ | |
1642 | /* white space in format matchs any amount of | |
1643 | * white space, including none, in the input. | |
1644 | */ | |
1645 | if (isspace(*fmt)) { | |
1646 | while (isspace(*fmt)) | |
1647 | ++fmt; | |
1648 | while (isspace(*str)) | |
1649 | ++str; | |
1650 | } | |
1651 | ||
1652 | /* anything that is not a conversion must match exactly */ | |
1653 | if (*fmt != '%' && *fmt) { | |
1654 | if (*fmt++ != *str++) | |
1655 | break; | |
1656 | continue; | |
1657 | } | |
1658 | ||
1659 | if (!*fmt) | |
1660 | break; | |
1661 | ++fmt; | |
1662 | ||
1663 | /* skip this conversion. | |
1664 | * advance both strings to next white space | |
1665 | */ | |
1666 | if (*fmt == '*') { | |
1667 | while (!isspace(*fmt) && *fmt) | |
1668 | fmt++; | |
1669 | while (!isspace(*str) && *str) | |
1670 | str++; | |
1671 | continue; | |
1672 | } | |
1673 | ||
1674 | /* get field width */ | |
1675 | field_width = -1; | |
1676 | if (isdigit(*fmt)) | |
1677 | field_width = skip_atoi(&fmt); | |
1678 | ||
1679 | /* get conversion qualifier */ | |
1680 | qualifier = -1; | |
1681 | if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || | |
1682 | *fmt == 'Z' || *fmt == 'z') { | |
1683 | qualifier = *fmt++; | |
1684 | if (unlikely(qualifier == *fmt)) { | |
1685 | if (qualifier == 'h') { | |
1686 | qualifier = 'H'; | |
1687 | fmt++; | |
1688 | } else if (qualifier == 'l') { | |
1689 | qualifier = 'L'; | |
1690 | fmt++; | |
1691 | } | |
1692 | } | |
1693 | } | |
1694 | base = 10; | |
1695 | is_sign = 0; | |
1696 | ||
1697 | if (!*fmt || !*str) | |
1698 | break; | |
1699 | ||
1700 | switch(*fmt++) { | |
1701 | case 'c': | |
1702 | { | |
1703 | char *s = (char *) va_arg(args,char*); | |
1704 | if (field_width == -1) | |
1705 | field_width = 1; | |
1706 | do { | |
1707 | *s++ = *str++; | |
1708 | } while (--field_width > 0 && *str); | |
1709 | num++; | |
1710 | } | |
1711 | continue; | |
1712 | case 's': | |
1713 | { | |
1714 | char *s = (char *) va_arg(args, char *); | |
1715 | if(field_width == -1) | |
1716 | field_width = INT_MAX; | |
1717 | /* first, skip leading white space in buffer */ | |
1718 | while (isspace(*str)) | |
1719 | str++; | |
1720 | ||
1721 | /* now copy until next white space */ | |
1722 | while (*str && !isspace(*str) && field_width--) { | |
1723 | *s++ = *str++; | |
1724 | } | |
1725 | *s = '\0'; | |
1726 | num++; | |
1727 | } | |
1728 | continue; | |
1729 | case 'n': | |
1730 | /* return number of characters read so far */ | |
1731 | { | |
1732 | int *i = (int *)va_arg(args,int*); | |
1733 | *i = str - buf; | |
1734 | } | |
1735 | continue; | |
1736 | case 'o': | |
1737 | base = 8; | |
1738 | break; | |
1739 | case 'x': | |
1740 | case 'X': | |
1741 | base = 16; | |
1742 | break; | |
1743 | case 'i': | |
1744 | base = 0; | |
1745 | case 'd': | |
1746 | is_sign = 1; | |
1747 | case 'u': | |
1748 | break; | |
1749 | case '%': | |
1750 | /* looking for '%' in str */ | |
1751 | if (*str++ != '%') | |
1752 | return num; | |
1753 | continue; | |
1754 | default: | |
1755 | /* invalid format; stop here */ | |
1756 | return num; | |
1757 | } | |
1758 | ||
1759 | /* have some sort of integer conversion. | |
1760 | * first, skip white space in buffer. | |
1761 | */ | |
1762 | while (isspace(*str)) | |
1763 | str++; | |
1764 | ||
1765 | digit = *str; | |
1766 | if (is_sign && digit == '-') | |
1767 | digit = *(str + 1); | |
1768 | ||
1769 | if (!digit | |
1770 | || (base == 16 && !isxdigit(digit)) | |
1771 | || (base == 10 && !isdigit(digit)) | |
1772 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
1773 | || (base == 0 && !isdigit(digit))) | |
1774 | break; | |
1775 | ||
1776 | switch(qualifier) { | |
1777 | case 'H': /* that's 'hh' in format */ | |
1778 | if (is_sign) { | |
1779 | signed char *s = (signed char *) va_arg(args,signed char *); | |
1780 | *s = (signed char) simple_strtol(str,&next,base); | |
1781 | } else { | |
1782 | unsigned char *s = (unsigned char *) va_arg(args, unsigned char *); | |
1783 | *s = (unsigned char) simple_strtoul(str, &next, base); | |
1784 | } | |
1785 | break; | |
1786 | case 'h': | |
1787 | if (is_sign) { | |
1788 | short *s = (short *) va_arg(args,short *); | |
1789 | *s = (short) simple_strtol(str,&next,base); | |
1790 | } else { | |
1791 | unsigned short *s = (unsigned short *) va_arg(args, unsigned short *); | |
1792 | *s = (unsigned short) simple_strtoul(str, &next, base); | |
1793 | } | |
1794 | break; | |
1795 | case 'l': | |
1796 | if (is_sign) { | |
1797 | long *l = (long *) va_arg(args,long *); | |
1798 | *l = simple_strtol(str,&next,base); | |
1799 | } else { | |
1800 | unsigned long *l = (unsigned long*) va_arg(args,unsigned long*); | |
1801 | *l = simple_strtoul(str,&next,base); | |
1802 | } | |
1803 | break; | |
1804 | case 'L': | |
1805 | if (is_sign) { | |
1806 | long long *l = (long long*) va_arg(args,long long *); | |
1807 | *l = simple_strtoll(str,&next,base); | |
1808 | } else { | |
1809 | unsigned long long *l = (unsigned long long*) va_arg(args,unsigned long long*); | |
1810 | *l = simple_strtoull(str,&next,base); | |
1811 | } | |
1812 | break; | |
1813 | case 'Z': | |
1814 | case 'z': | |
1815 | { | |
1816 | size_t *s = (size_t*) va_arg(args,size_t*); | |
1817 | *s = (size_t) simple_strtoul(str,&next,base); | |
1818 | } | |
1819 | break; | |
1820 | default: | |
1821 | if (is_sign) { | |
1822 | int *i = (int *) va_arg(args, int*); | |
1823 | *i = (int) simple_strtol(str,&next,base); | |
1824 | } else { | |
1825 | unsigned int *i = (unsigned int*) va_arg(args, unsigned int*); | |
1826 | *i = (unsigned int) simple_strtoul(str,&next,base); | |
1827 | } | |
1828 | break; | |
1829 | } | |
1830 | num++; | |
1831 | ||
1832 | if (!next) | |
1833 | break; | |
1834 | str = next; | |
1835 | } | |
c6b40d16 JB |
1836 | |
1837 | /* | |
1838 | * Now we've come all the way through so either the input string or the | |
1839 | * format ended. In the former case, there can be a %n at the current | |
1840 | * position in the format that needs to be filled. | |
1841 | */ | |
1842 | if (*fmt == '%' && *(fmt + 1) == 'n') { | |
1843 | int *p = (int *)va_arg(args, int *); | |
1844 | *p = str - buf; | |
1845 | } | |
1846 | ||
1da177e4 LT |
1847 | return num; |
1848 | } | |
1da177e4 LT |
1849 | EXPORT_SYMBOL(vsscanf); |
1850 | ||
1851 | /** | |
1852 | * sscanf - Unformat a buffer into a list of arguments | |
1853 | * @buf: input buffer | |
1854 | * @fmt: formatting of buffer | |
1855 | * @...: resulting arguments | |
1856 | */ | |
1857 | int sscanf(const char * buf, const char * fmt, ...) | |
1858 | { | |
1859 | va_list args; | |
1860 | int i; | |
1861 | ||
1862 | va_start(args,fmt); | |
1863 | i = vsscanf(buf,fmt,args); | |
1864 | va_end(args); | |
1865 | return i; | |
1866 | } | |
1da177e4 | 1867 | EXPORT_SYMBOL(sscanf); |