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Commit | Line | Data |
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1 | /* | |
2 | * linux/lib/vsprintf.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | */ | |
6 | ||
7 | /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */ | |
8 | /* | |
9 | * Wirzenius wrote this portably, Torvalds fucked it up :-) | |
10 | */ | |
11 | ||
12 | /* | |
13 | * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com> | |
14 | * - changed to provide snprintf and vsnprintf functions | |
15 | * So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de> | |
16 | * - scnprintf and vscnprintf | |
17 | */ | |
18 | ||
19 | #include <stdarg.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/types.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/ctype.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/kallsyms.h> | |
26 | #include <linux/uaccess.h> | |
27 | #include <linux/ioport.h> | |
28 | #include <net/addrconf.h> | |
29 | ||
30 | #include <asm/page.h> /* for PAGE_SIZE */ | |
31 | #include <asm/div64.h> | |
32 | #include <asm/sections.h> /* for dereference_function_descriptor() */ | |
33 | ||
34 | /* Works only for digits and letters, but small and fast */ | |
35 | #define TOLOWER(x) ((x) | 0x20) | |
36 | ||
37 | static unsigned int simple_guess_base(const char *cp) | |
38 | { | |
39 | if (cp[0] == '0') { | |
40 | if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2])) | |
41 | return 16; | |
42 | else | |
43 | return 8; | |
44 | } else { | |
45 | return 10; | |
46 | } | |
47 | } | |
48 | ||
49 | /** | |
50 | * simple_strtoull - convert a string to an unsigned long long | |
51 | * @cp: The start of the string | |
52 | * @endp: A pointer to the end of the parsed string will be placed here | |
53 | * @base: The number base to use | |
54 | */ | |
55 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) | |
56 | { | |
57 | unsigned long long result = 0; | |
58 | ||
59 | if (!base) | |
60 | base = simple_guess_base(cp); | |
61 | ||
62 | if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x') | |
63 | cp += 2; | |
64 | ||
65 | while (isxdigit(*cp)) { | |
66 | unsigned int value; | |
67 | ||
68 | value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10; | |
69 | if (value >= base) | |
70 | break; | |
71 | result = result * base + value; | |
72 | cp++; | |
73 | } | |
74 | if (endp) | |
75 | *endp = (char *)cp; | |
76 | ||
77 | return result; | |
78 | } | |
79 | EXPORT_SYMBOL(simple_strtoull); | |
80 | ||
81 | /** | |
82 | * simple_strtoul - convert a string to an unsigned long | |
83 | * @cp: The start of the string | |
84 | * @endp: A pointer to the end of the parsed string will be placed here | |
85 | * @base: The number base to use | |
86 | */ | |
87 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) | |
88 | { | |
89 | return simple_strtoull(cp, endp, base); | |
90 | } | |
91 | EXPORT_SYMBOL(simple_strtoul); | |
92 | ||
93 | /** | |
94 | * simple_strtol - convert a string to a signed 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 | */ | |
99 | long simple_strtol(const char *cp, char **endp, unsigned int base) | |
100 | { | |
101 | if (*cp == '-') | |
102 | return -simple_strtoul(cp + 1, endp, base); | |
103 | ||
104 | return simple_strtoul(cp, endp, base); | |
105 | } | |
106 | EXPORT_SYMBOL(simple_strtol); | |
107 | ||
108 | /** | |
109 | * simple_strtoll - convert a string to a signed long long | |
110 | * @cp: The start of the string | |
111 | * @endp: A pointer to the end of the parsed string will be placed here | |
112 | * @base: The number base to use | |
113 | */ | |
114 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) | |
115 | { | |
116 | if (*cp == '-') | |
117 | return -simple_strtoull(cp + 1, endp, base); | |
118 | ||
119 | return simple_strtoull(cp, endp, base); | |
120 | } | |
121 | EXPORT_SYMBOL(simple_strtoll); | |
122 | ||
123 | /** | |
124 | * strict_strtoul - convert a string to an unsigned long strictly | |
125 | * @cp: The string to be converted | |
126 | * @base: The number base to use | |
127 | * @res: The converted result value | |
128 | * | |
129 | * strict_strtoul converts a string to an unsigned long only if the | |
130 | * string is really an unsigned long string, any string containing | |
131 | * any invalid char at the tail will be rejected and -EINVAL is returned, | |
132 | * only a newline char at the tail is acceptible because people generally | |
133 | * change a module parameter in the following way: | |
134 | * | |
135 | * echo 1024 > /sys/module/e1000/parameters/copybreak | |
136 | * | |
137 | * echo will append a newline to the tail. | |
138 | * | |
139 | * It returns 0 if conversion is successful and *res is set to the converted | |
140 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
141 | * | |
142 | * simple_strtoul just ignores the successive invalid characters and | |
143 | * return the converted value of prefix part of the string. | |
144 | */ | |
145 | int strict_strtoul(const char *cp, unsigned int base, unsigned long *res) | |
146 | { | |
147 | char *tail; | |
148 | unsigned long val; | |
149 | ||
150 | *res = 0; | |
151 | if (!*cp) | |
152 | return -EINVAL; | |
153 | ||
154 | val = simple_strtoul(cp, &tail, base); | |
155 | if (tail == cp) | |
156 | return -EINVAL; | |
157 | ||
158 | if ((tail[0] == '\0') || (tail[0] == '\n' && tail[1] == '\0')) { | |
159 | *res = val; | |
160 | return 0; | |
161 | } | |
162 | ||
163 | return -EINVAL; | |
164 | } | |
165 | EXPORT_SYMBOL(strict_strtoul); | |
166 | ||
167 | /** | |
168 | * strict_strtol - convert a string to a long strictly | |
169 | * @cp: The string to be converted | |
170 | * @base: The number base to use | |
171 | * @res: The converted result value | |
172 | * | |
173 | * strict_strtol is similiar to strict_strtoul, but it allows the first | |
174 | * character of a string is '-'. | |
175 | * | |
176 | * It returns 0 if conversion is successful and *res is set to the converted | |
177 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
178 | */ | |
179 | int strict_strtol(const char *cp, unsigned int base, long *res) | |
180 | { | |
181 | int ret; | |
182 | if (*cp == '-') { | |
183 | ret = strict_strtoul(cp + 1, base, (unsigned long *)res); | |
184 | if (!ret) | |
185 | *res = -(*res); | |
186 | } else { | |
187 | ret = strict_strtoul(cp, base, (unsigned long *)res); | |
188 | } | |
189 | ||
190 | return ret; | |
191 | } | |
192 | EXPORT_SYMBOL(strict_strtol); | |
193 | ||
194 | /** | |
195 | * strict_strtoull - convert a string to an unsigned long long strictly | |
196 | * @cp: The string to be converted | |
197 | * @base: The number base to use | |
198 | * @res: The converted result value | |
199 | * | |
200 | * strict_strtoull converts a string to an unsigned long long only if the | |
201 | * string is really an unsigned long long string, any string containing | |
202 | * any invalid char at the tail will be rejected and -EINVAL is returned, | |
203 | * only a newline char at the tail is acceptible because people generally | |
204 | * change a module parameter in the following way: | |
205 | * | |
206 | * echo 1024 > /sys/module/e1000/parameters/copybreak | |
207 | * | |
208 | * echo will append a newline to the tail of the string. | |
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 | * simple_strtoull just ignores the successive invalid characters and | |
214 | * return the converted value of prefix part of the string. | |
215 | */ | |
216 | int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res) | |
217 | { | |
218 | char *tail; | |
219 | unsigned long long val; | |
220 | ||
221 | *res = 0; | |
222 | if (!*cp) | |
223 | return -EINVAL; | |
224 | ||
225 | val = simple_strtoull(cp, &tail, base); | |
226 | if (tail == cp) | |
227 | return -EINVAL; | |
228 | if ((tail[0] == '\0') || (tail[0] == '\n' && tail[1] == '\0')) { | |
229 | *res = val; | |
230 | return 0; | |
231 | } | |
232 | ||
233 | return -EINVAL; | |
234 | } | |
235 | EXPORT_SYMBOL(strict_strtoull); | |
236 | ||
237 | /** | |
238 | * strict_strtoll - convert a string to a long long strictly | |
239 | * @cp: The string to be converted | |
240 | * @base: The number base to use | |
241 | * @res: The converted result value | |
242 | * | |
243 | * strict_strtoll is similiar to strict_strtoull, but it allows the first | |
244 | * character of a string is '-'. | |
245 | * | |
246 | * It returns 0 if conversion is successful and *res is set to the converted | |
247 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
248 | */ | |
249 | int strict_strtoll(const char *cp, unsigned int base, long long *res) | |
250 | { | |
251 | int ret; | |
252 | if (*cp == '-') { | |
253 | ret = strict_strtoull(cp + 1, base, (unsigned long long *)res); | |
254 | if (!ret) | |
255 | *res = -(*res); | |
256 | } else { | |
257 | ret = strict_strtoull(cp, base, (unsigned long long *)res); | |
258 | } | |
259 | ||
260 | return ret; | |
261 | } | |
262 | EXPORT_SYMBOL(strict_strtoll); | |
263 | ||
264 | static noinline_for_stack | |
265 | int skip_atoi(const char **s) | |
266 | { | |
267 | int i = 0; | |
268 | ||
269 | while (isdigit(**s)) | |
270 | i = i*10 + *((*s)++) - '0'; | |
271 | ||
272 | return i; | |
273 | } | |
274 | ||
275 | /* Decimal conversion is by far the most typical, and is used | |
276 | * for /proc and /sys data. This directly impacts e.g. top performance | |
277 | * with many processes running. We optimize it for speed | |
278 | * using code from | |
279 | * http://www.cs.uiowa.edu/~jones/bcd/decimal.html | |
280 | * (with permission from the author, Douglas W. Jones). */ | |
281 | ||
282 | /* Formats correctly any integer in [0,99999]. | |
283 | * Outputs from one to five digits depending on input. | |
284 | * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */ | |
285 | static noinline_for_stack | |
286 | char *put_dec_trunc(char *buf, unsigned q) | |
287 | { | |
288 | unsigned d3, d2, d1, d0; | |
289 | d1 = (q>>4) & 0xf; | |
290 | d2 = (q>>8) & 0xf; | |
291 | d3 = (q>>12); | |
292 | ||
293 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); | |
294 | q = (d0 * 0xcd) >> 11; | |
295 | d0 = d0 - 10*q; | |
296 | *buf++ = d0 + '0'; /* least significant digit */ | |
297 | d1 = q + 9*d3 + 5*d2 + d1; | |
298 | if (d1 != 0) { | |
299 | q = (d1 * 0xcd) >> 11; | |
300 | d1 = d1 - 10*q; | |
301 | *buf++ = d1 + '0'; /* next digit */ | |
302 | ||
303 | d2 = q + 2*d2; | |
304 | if ((d2 != 0) || (d3 != 0)) { | |
305 | q = (d2 * 0xd) >> 7; | |
306 | d2 = d2 - 10*q; | |
307 | *buf++ = d2 + '0'; /* next digit */ | |
308 | ||
309 | d3 = q + 4*d3; | |
310 | if (d3 != 0) { | |
311 | q = (d3 * 0xcd) >> 11; | |
312 | d3 = d3 - 10*q; | |
313 | *buf++ = d3 + '0'; /* next digit */ | |
314 | if (q != 0) | |
315 | *buf++ = q + '0'; /* most sign. digit */ | |
316 | } | |
317 | } | |
318 | } | |
319 | ||
320 | return buf; | |
321 | } | |
322 | /* Same with if's removed. Always emits five digits */ | |
323 | static noinline_for_stack | |
324 | char *put_dec_full(char *buf, unsigned q) | |
325 | { | |
326 | /* BTW, if q is in [0,9999], 8-bit ints will be enough, */ | |
327 | /* but anyway, gcc produces better code with full-sized ints */ | |
328 | unsigned d3, d2, d1, d0; | |
329 | d1 = (q>>4) & 0xf; | |
330 | d2 = (q>>8) & 0xf; | |
331 | d3 = (q>>12); | |
332 | ||
333 | /* | |
334 | * Possible ways to approx. divide by 10 | |
335 | * gcc -O2 replaces multiply with shifts and adds | |
336 | * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386) | |
337 | * (x * 0x67) >> 10: 1100111 | |
338 | * (x * 0x34) >> 9: 110100 - same | |
339 | * (x * 0x1a) >> 8: 11010 - same | |
340 | * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386) | |
341 | */ | |
342 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); | |
343 | q = (d0 * 0xcd) >> 11; | |
344 | d0 = d0 - 10*q; | |
345 | *buf++ = d0 + '0'; | |
346 | d1 = q + 9*d3 + 5*d2 + d1; | |
347 | q = (d1 * 0xcd) >> 11; | |
348 | d1 = d1 - 10*q; | |
349 | *buf++ = d1 + '0'; | |
350 | ||
351 | d2 = q + 2*d2; | |
352 | q = (d2 * 0xd) >> 7; | |
353 | d2 = d2 - 10*q; | |
354 | *buf++ = d2 + '0'; | |
355 | ||
356 | d3 = q + 4*d3; | |
357 | q = (d3 * 0xcd) >> 11; /* - shorter code */ | |
358 | /* q = (d3 * 0x67) >> 10; - would also work */ | |
359 | d3 = d3 - 10*q; | |
360 | *buf++ = d3 + '0'; | |
361 | *buf++ = q + '0'; | |
362 | ||
363 | return buf; | |
364 | } | |
365 | /* No inlining helps gcc to use registers better */ | |
366 | static noinline_for_stack | |
367 | char *put_dec(char *buf, unsigned long long num) | |
368 | { | |
369 | while (1) { | |
370 | unsigned rem; | |
371 | if (num < 100000) | |
372 | return put_dec_trunc(buf, num); | |
373 | rem = do_div(num, 100000); | |
374 | buf = put_dec_full(buf, rem); | |
375 | } | |
376 | } | |
377 | ||
378 | #define ZEROPAD 1 /* pad with zero */ | |
379 | #define SIGN 2 /* unsigned/signed long */ | |
380 | #define PLUS 4 /* show plus */ | |
381 | #define SPACE 8 /* space if plus */ | |
382 | #define LEFT 16 /* left justified */ | |
383 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ | |
384 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ | |
385 | ||
386 | enum format_type { | |
387 | FORMAT_TYPE_NONE, /* Just a string part */ | |
388 | FORMAT_TYPE_WIDTH, | |
389 | FORMAT_TYPE_PRECISION, | |
390 | FORMAT_TYPE_CHAR, | |
391 | FORMAT_TYPE_STR, | |
392 | FORMAT_TYPE_PTR, | |
393 | FORMAT_TYPE_PERCENT_CHAR, | |
394 | FORMAT_TYPE_INVALID, | |
395 | FORMAT_TYPE_LONG_LONG, | |
396 | FORMAT_TYPE_ULONG, | |
397 | FORMAT_TYPE_LONG, | |
398 | FORMAT_TYPE_UBYTE, | |
399 | FORMAT_TYPE_BYTE, | |
400 | FORMAT_TYPE_USHORT, | |
401 | FORMAT_TYPE_SHORT, | |
402 | FORMAT_TYPE_UINT, | |
403 | FORMAT_TYPE_INT, | |
404 | FORMAT_TYPE_NRCHARS, | |
405 | FORMAT_TYPE_SIZE_T, | |
406 | FORMAT_TYPE_PTRDIFF | |
407 | }; | |
408 | ||
409 | struct printf_spec { | |
410 | u8 type; /* format_type enum */ | |
411 | u8 flags; /* flags to number() */ | |
412 | u8 base; /* number base, 8, 10 or 16 only */ | |
413 | u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */ | |
414 | s16 field_width; /* width of output field */ | |
415 | s16 precision; /* # of digits/chars */ | |
416 | }; | |
417 | ||
418 | static noinline_for_stack | |
419 | char *number(char *buf, char *end, unsigned long long num, | |
420 | struct printf_spec spec) | |
421 | { | |
422 | /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ | |
423 | static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ | |
424 | ||
425 | char tmp[66]; | |
426 | char sign; | |
427 | char locase; | |
428 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); | |
429 | int i; | |
430 | ||
431 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' | |
432 | * produces same digits or (maybe lowercased) letters */ | |
433 | locase = (spec.flags & SMALL); | |
434 | if (spec.flags & LEFT) | |
435 | spec.flags &= ~ZEROPAD; | |
436 | sign = 0; | |
437 | if (spec.flags & SIGN) { | |
438 | if ((signed long long)num < 0) { | |
439 | sign = '-'; | |
440 | num = -(signed long long)num; | |
441 | spec.field_width--; | |
442 | } else if (spec.flags & PLUS) { | |
443 | sign = '+'; | |
444 | spec.field_width--; | |
445 | } else if (spec.flags & SPACE) { | |
446 | sign = ' '; | |
447 | spec.field_width--; | |
448 | } | |
449 | } | |
450 | if (need_pfx) { | |
451 | spec.field_width--; | |
452 | if (spec.base == 16) | |
453 | spec.field_width--; | |
454 | } | |
455 | ||
456 | /* generate full string in tmp[], in reverse order */ | |
457 | i = 0; | |
458 | if (num == 0) | |
459 | tmp[i++] = '0'; | |
460 | /* Generic code, for any base: | |
461 | else do { | |
462 | tmp[i++] = (digits[do_div(num,base)] | locase); | |
463 | } while (num != 0); | |
464 | */ | |
465 | else if (spec.base != 10) { /* 8 or 16 */ | |
466 | int mask = spec.base - 1; | |
467 | int shift = 3; | |
468 | ||
469 | if (spec.base == 16) | |
470 | shift = 4; | |
471 | do { | |
472 | tmp[i++] = (digits[((unsigned char)num) & mask] | locase); | |
473 | num >>= shift; | |
474 | } while (num); | |
475 | } else { /* base 10 */ | |
476 | i = put_dec(tmp, num) - tmp; | |
477 | } | |
478 | ||
479 | /* printing 100 using %2d gives "100", not "00" */ | |
480 | if (i > spec.precision) | |
481 | spec.precision = i; | |
482 | /* leading space padding */ | |
483 | spec.field_width -= spec.precision; | |
484 | if (!(spec.flags & (ZEROPAD+LEFT))) { | |
485 | while (--spec.field_width >= 0) { | |
486 | if (buf < end) | |
487 | *buf = ' '; | |
488 | ++buf; | |
489 | } | |
490 | } | |
491 | /* sign */ | |
492 | if (sign) { | |
493 | if (buf < end) | |
494 | *buf = sign; | |
495 | ++buf; | |
496 | } | |
497 | /* "0x" / "0" prefix */ | |
498 | if (need_pfx) { | |
499 | if (buf < end) | |
500 | *buf = '0'; | |
501 | ++buf; | |
502 | if (spec.base == 16) { | |
503 | if (buf < end) | |
504 | *buf = ('X' | locase); | |
505 | ++buf; | |
506 | } | |
507 | } | |
508 | /* zero or space padding */ | |
509 | if (!(spec.flags & LEFT)) { | |
510 | char c = (spec.flags & ZEROPAD) ? '0' : ' '; | |
511 | while (--spec.field_width >= 0) { | |
512 | if (buf < end) | |
513 | *buf = c; | |
514 | ++buf; | |
515 | } | |
516 | } | |
517 | /* hmm even more zero padding? */ | |
518 | while (i <= --spec.precision) { | |
519 | if (buf < end) | |
520 | *buf = '0'; | |
521 | ++buf; | |
522 | } | |
523 | /* actual digits of result */ | |
524 | while (--i >= 0) { | |
525 | if (buf < end) | |
526 | *buf = tmp[i]; | |
527 | ++buf; | |
528 | } | |
529 | /* trailing space padding */ | |
530 | while (--spec.field_width >= 0) { | |
531 | if (buf < end) | |
532 | *buf = ' '; | |
533 | ++buf; | |
534 | } | |
535 | ||
536 | return buf; | |
537 | } | |
538 | ||
539 | static noinline_for_stack | |
540 | char *string(char *buf, char *end, const char *s, struct printf_spec spec) | |
541 | { | |
542 | int len, i; | |
543 | ||
544 | if ((unsigned long)s < PAGE_SIZE) | |
545 | s = "(null)"; | |
546 | ||
547 | len = strnlen(s, spec.precision); | |
548 | ||
549 | if (!(spec.flags & LEFT)) { | |
550 | while (len < spec.field_width--) { | |
551 | if (buf < end) | |
552 | *buf = ' '; | |
553 | ++buf; | |
554 | } | |
555 | } | |
556 | for (i = 0; i < len; ++i) { | |
557 | if (buf < end) | |
558 | *buf = *s; | |
559 | ++buf; ++s; | |
560 | } | |
561 | while (len < spec.field_width--) { | |
562 | if (buf < end) | |
563 | *buf = ' '; | |
564 | ++buf; | |
565 | } | |
566 | ||
567 | return buf; | |
568 | } | |
569 | ||
570 | static noinline_for_stack | |
571 | char *symbol_string(char *buf, char *end, void *ptr, | |
572 | struct printf_spec spec, char ext) | |
573 | { | |
574 | unsigned long value = (unsigned long) ptr; | |
575 | #ifdef CONFIG_KALLSYMS | |
576 | char sym[KSYM_SYMBOL_LEN]; | |
577 | if (ext != 'f' && ext != 's') | |
578 | sprint_symbol(sym, value); | |
579 | else | |
580 | kallsyms_lookup(value, NULL, NULL, NULL, sym); | |
581 | ||
582 | return string(buf, end, sym, spec); | |
583 | #else | |
584 | spec.field_width = 2 * sizeof(void *); | |
585 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
586 | spec.base = 16; | |
587 | ||
588 | return number(buf, end, value, spec); | |
589 | #endif | |
590 | } | |
591 | ||
592 | static noinline_for_stack | |
593 | char *resource_string(char *buf, char *end, struct resource *res, | |
594 | struct printf_spec spec, const char *fmt) | |
595 | { | |
596 | #ifndef IO_RSRC_PRINTK_SIZE | |
597 | #define IO_RSRC_PRINTK_SIZE 6 | |
598 | #endif | |
599 | ||
600 | #ifndef MEM_RSRC_PRINTK_SIZE | |
601 | #define MEM_RSRC_PRINTK_SIZE 10 | |
602 | #endif | |
603 | static const struct printf_spec io_spec = { | |
604 | .base = 16, | |
605 | .field_width = IO_RSRC_PRINTK_SIZE, | |
606 | .precision = -1, | |
607 | .flags = SPECIAL | SMALL | ZEROPAD, | |
608 | }; | |
609 | static const struct printf_spec mem_spec = { | |
610 | .base = 16, | |
611 | .field_width = MEM_RSRC_PRINTK_SIZE, | |
612 | .precision = -1, | |
613 | .flags = SPECIAL | SMALL | ZEROPAD, | |
614 | }; | |
615 | static const struct printf_spec bus_spec = { | |
616 | .base = 16, | |
617 | .field_width = 2, | |
618 | .precision = -1, | |
619 | .flags = SMALL | ZEROPAD, | |
620 | }; | |
621 | static const struct printf_spec dec_spec = { | |
622 | .base = 10, | |
623 | .precision = -1, | |
624 | .flags = 0, | |
625 | }; | |
626 | static const struct printf_spec str_spec = { | |
627 | .field_width = -1, | |
628 | .precision = 10, | |
629 | .flags = LEFT, | |
630 | }; | |
631 | static const struct printf_spec flag_spec = { | |
632 | .base = 16, | |
633 | .precision = -1, | |
634 | .flags = SPECIAL | SMALL, | |
635 | }; | |
636 | ||
637 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) | |
638 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ | |
639 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) | |
640 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) | |
641 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") | |
642 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") | |
643 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, | |
644 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; | |
645 | ||
646 | char *p = sym, *pend = sym + sizeof(sym); | |
647 | int decode = (fmt[0] == 'R') ? 1 : 0; | |
648 | const struct printf_spec *specp; | |
649 | ||
650 | *p++ = '['; | |
651 | if (res->flags & IORESOURCE_IO) { | |
652 | p = string(p, pend, "io ", str_spec); | |
653 | specp = &io_spec; | |
654 | } else if (res->flags & IORESOURCE_MEM) { | |
655 | p = string(p, pend, "mem ", str_spec); | |
656 | specp = &mem_spec; | |
657 | } else if (res->flags & IORESOURCE_IRQ) { | |
658 | p = string(p, pend, "irq ", str_spec); | |
659 | specp = &dec_spec; | |
660 | } else if (res->flags & IORESOURCE_DMA) { | |
661 | p = string(p, pend, "dma ", str_spec); | |
662 | specp = &dec_spec; | |
663 | } else if (res->flags & IORESOURCE_BUS) { | |
664 | p = string(p, pend, "bus ", str_spec); | |
665 | specp = &bus_spec; | |
666 | } else { | |
667 | p = string(p, pend, "??? ", str_spec); | |
668 | specp = &mem_spec; | |
669 | decode = 0; | |
670 | } | |
671 | p = number(p, pend, res->start, *specp); | |
672 | if (res->start != res->end) { | |
673 | *p++ = '-'; | |
674 | p = number(p, pend, res->end, *specp); | |
675 | } | |
676 | if (decode) { | |
677 | if (res->flags & IORESOURCE_MEM_64) | |
678 | p = string(p, pend, " 64bit", str_spec); | |
679 | if (res->flags & IORESOURCE_PREFETCH) | |
680 | p = string(p, pend, " pref", str_spec); | |
681 | if (res->flags & IORESOURCE_WINDOW) | |
682 | p = string(p, pend, " window", str_spec); | |
683 | if (res->flags & IORESOURCE_DISABLED) | |
684 | p = string(p, pend, " disabled", str_spec); | |
685 | } else { | |
686 | p = string(p, pend, " flags ", str_spec); | |
687 | p = number(p, pend, res->flags, flag_spec); | |
688 | } | |
689 | *p++ = ']'; | |
690 | *p = '\0'; | |
691 | ||
692 | return string(buf, end, sym, spec); | |
693 | } | |
694 | ||
695 | static noinline_for_stack | |
696 | char *mac_address_string(char *buf, char *end, u8 *addr, | |
697 | struct printf_spec spec, const char *fmt) | |
698 | { | |
699 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; | |
700 | char *p = mac_addr; | |
701 | int i; | |
702 | char separator; | |
703 | ||
704 | if (fmt[1] == 'F') { /* FDDI canonical format */ | |
705 | separator = '-'; | |
706 | } else { | |
707 | separator = ':'; | |
708 | } | |
709 | ||
710 | for (i = 0; i < 6; i++) { | |
711 | p = pack_hex_byte(p, addr[i]); | |
712 | if (fmt[0] == 'M' && i != 5) | |
713 | *p++ = separator; | |
714 | } | |
715 | *p = '\0'; | |
716 | ||
717 | return string(buf, end, mac_addr, spec); | |
718 | } | |
719 | ||
720 | static noinline_for_stack | |
721 | char *ip4_string(char *p, const u8 *addr, const char *fmt) | |
722 | { | |
723 | int i; | |
724 | bool leading_zeros = (fmt[0] == 'i'); | |
725 | int index; | |
726 | int step; | |
727 | ||
728 | switch (fmt[2]) { | |
729 | case 'h': | |
730 | #ifdef __BIG_ENDIAN | |
731 | index = 0; | |
732 | step = 1; | |
733 | #else | |
734 | index = 3; | |
735 | step = -1; | |
736 | #endif | |
737 | break; | |
738 | case 'l': | |
739 | index = 3; | |
740 | step = -1; | |
741 | break; | |
742 | case 'n': | |
743 | case 'b': | |
744 | default: | |
745 | index = 0; | |
746 | step = 1; | |
747 | break; | |
748 | } | |
749 | for (i = 0; i < 4; i++) { | |
750 | char temp[3]; /* hold each IP quad in reverse order */ | |
751 | int digits = put_dec_trunc(temp, addr[index]) - temp; | |
752 | if (leading_zeros) { | |
753 | if (digits < 3) | |
754 | *p++ = '0'; | |
755 | if (digits < 2) | |
756 | *p++ = '0'; | |
757 | } | |
758 | /* reverse the digits in the quad */ | |
759 | while (digits--) | |
760 | *p++ = temp[digits]; | |
761 | if (i < 3) | |
762 | *p++ = '.'; | |
763 | index += step; | |
764 | } | |
765 | *p = '\0'; | |
766 | ||
767 | return p; | |
768 | } | |
769 | ||
770 | static noinline_for_stack | |
771 | char *ip6_compressed_string(char *p, const char *addr) | |
772 | { | |
773 | int i, j, range; | |
774 | unsigned char zerolength[8]; | |
775 | int longest = 1; | |
776 | int colonpos = -1; | |
777 | u16 word; | |
778 | u8 hi, lo; | |
779 | bool needcolon = false; | |
780 | bool useIPv4; | |
781 | struct in6_addr in6; | |
782 | ||
783 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
784 | ||
785 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
786 | ||
787 | memset(zerolength, 0, sizeof(zerolength)); | |
788 | ||
789 | if (useIPv4) | |
790 | range = 6; | |
791 | else | |
792 | range = 8; | |
793 | ||
794 | /* find position of longest 0 run */ | |
795 | for (i = 0; i < range; i++) { | |
796 | for (j = i; j < range; j++) { | |
797 | if (in6.s6_addr16[j] != 0) | |
798 | break; | |
799 | zerolength[i]++; | |
800 | } | |
801 | } | |
802 | for (i = 0; i < range; i++) { | |
803 | if (zerolength[i] > longest) { | |
804 | longest = zerolength[i]; | |
805 | colonpos = i; | |
806 | } | |
807 | } | |
808 | ||
809 | /* emit address */ | |
810 | for (i = 0; i < range; i++) { | |
811 | if (i == colonpos) { | |
812 | if (needcolon || i == 0) | |
813 | *p++ = ':'; | |
814 | *p++ = ':'; | |
815 | needcolon = false; | |
816 | i += longest - 1; | |
817 | continue; | |
818 | } | |
819 | if (needcolon) { | |
820 | *p++ = ':'; | |
821 | needcolon = false; | |
822 | } | |
823 | /* hex u16 without leading 0s */ | |
824 | word = ntohs(in6.s6_addr16[i]); | |
825 | hi = word >> 8; | |
826 | lo = word & 0xff; | |
827 | if (hi) { | |
828 | if (hi > 0x0f) | |
829 | p = pack_hex_byte(p, hi); | |
830 | else | |
831 | *p++ = hex_asc_lo(hi); | |
832 | p = pack_hex_byte(p, lo); | |
833 | } | |
834 | else if (lo > 0x0f) | |
835 | p = pack_hex_byte(p, lo); | |
836 | else | |
837 | *p++ = hex_asc_lo(lo); | |
838 | needcolon = true; | |
839 | } | |
840 | ||
841 | if (useIPv4) { | |
842 | if (needcolon) | |
843 | *p++ = ':'; | |
844 | p = ip4_string(p, &in6.s6_addr[12], "I4"); | |
845 | } | |
846 | *p = '\0'; | |
847 | ||
848 | return p; | |
849 | } | |
850 | ||
851 | static noinline_for_stack | |
852 | char *ip6_string(char *p, const char *addr, const char *fmt) | |
853 | { | |
854 | int i; | |
855 | ||
856 | for (i = 0; i < 8; i++) { | |
857 | p = pack_hex_byte(p, *addr++); | |
858 | p = pack_hex_byte(p, *addr++); | |
859 | if (fmt[0] == 'I' && i != 7) | |
860 | *p++ = ':'; | |
861 | } | |
862 | *p = '\0'; | |
863 | ||
864 | return p; | |
865 | } | |
866 | ||
867 | static noinline_for_stack | |
868 | char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
869 | struct printf_spec spec, const char *fmt) | |
870 | { | |
871 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
872 | ||
873 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
874 | ip6_compressed_string(ip6_addr, addr); | |
875 | else | |
876 | ip6_string(ip6_addr, addr, fmt); | |
877 | ||
878 | return string(buf, end, ip6_addr, spec); | |
879 | } | |
880 | ||
881 | static noinline_for_stack | |
882 | char *ip4_addr_string(char *buf, char *end, const u8 *addr, | |
883 | struct printf_spec spec, const char *fmt) | |
884 | { | |
885 | char ip4_addr[sizeof("255.255.255.255")]; | |
886 | ||
887 | ip4_string(ip4_addr, addr, fmt); | |
888 | ||
889 | return string(buf, end, ip4_addr, spec); | |
890 | } | |
891 | ||
892 | static noinline_for_stack | |
893 | char *uuid_string(char *buf, char *end, const u8 *addr, | |
894 | struct printf_spec spec, const char *fmt) | |
895 | { | |
896 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; | |
897 | char *p = uuid; | |
898 | int i; | |
899 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; | |
900 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; | |
901 | const u8 *index = be; | |
902 | bool uc = false; | |
903 | ||
904 | switch (*(++fmt)) { | |
905 | case 'L': | |
906 | uc = true; /* fall-through */ | |
907 | case 'l': | |
908 | index = le; | |
909 | break; | |
910 | case 'B': | |
911 | uc = true; | |
912 | break; | |
913 | } | |
914 | ||
915 | for (i = 0; i < 16; i++) { | |
916 | p = pack_hex_byte(p, addr[index[i]]); | |
917 | switch (i) { | |
918 | case 3: | |
919 | case 5: | |
920 | case 7: | |
921 | case 9: | |
922 | *p++ = '-'; | |
923 | break; | |
924 | } | |
925 | } | |
926 | ||
927 | *p = 0; | |
928 | ||
929 | if (uc) { | |
930 | p = uuid; | |
931 | do { | |
932 | *p = toupper(*p); | |
933 | } while (*(++p)); | |
934 | } | |
935 | ||
936 | return string(buf, end, uuid, spec); | |
937 | } | |
938 | ||
939 | /* | |
940 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
941 | * by an extra set of alphanumeric characters that are extended format | |
942 | * specifiers. | |
943 | * | |
944 | * Right now we handle: | |
945 | * | |
946 | * - 'F' For symbolic function descriptor pointers with offset | |
947 | * - 'f' For simple symbolic function names without offset | |
948 | * - 'S' For symbolic direct pointers with offset | |
949 | * - 's' For symbolic direct pointers without offset | |
950 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] | |
951 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
952 | * - 'M' For a 6-byte MAC address, it prints the address in the | |
953 | * usual colon-separated hex notation | |
954 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons | |
955 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address | |
956 | * with a dash-separated hex notation | |
957 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way | |
958 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
959 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
960 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses | |
961 | * IPv6 omits the colons (01020304...0f) | |
962 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
963 | * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order | |
964 | * - 'I6c' for IPv6 addresses printed as specified by | |
965 | * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00 | |
966 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form | |
967 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" | |
968 | * Options for %pU are: | |
969 | * b big endian lower case hex (default) | |
970 | * B big endian UPPER case hex | |
971 | * l little endian lower case hex | |
972 | * L little endian UPPER case hex | |
973 | * big endian output byte order is: | |
974 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] | |
975 | * little endian output byte order is: | |
976 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] | |
977 | * - 'V' For a struct va_format which contains a format string * and va_list *, | |
978 | * call vsnprintf(->format, *->va_list). | |
979 | * Implements a "recursive vsnprintf". | |
980 | * Do not use this feature without some mechanism to verify the | |
981 | * correctness of the format string and va_list arguments. | |
982 | * | |
983 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 | |
984 | * function pointers are really function descriptors, which contain a | |
985 | * pointer to the real address. | |
986 | */ | |
987 | static noinline_for_stack | |
988 | char *pointer(const char *fmt, char *buf, char *end, void *ptr, | |
989 | struct printf_spec spec) | |
990 | { | |
991 | if (!ptr) { | |
992 | /* | |
993 | * Print (null) with the same width as a pointer so it makes | |
994 | * tabular output look nice. | |
995 | */ | |
996 | if (spec.field_width == -1) | |
997 | spec.field_width = 2 * sizeof(void *); | |
998 | return string(buf, end, "(null)", spec); | |
999 | } | |
1000 | ||
1001 | switch (*fmt) { | |
1002 | case 'F': | |
1003 | case 'f': | |
1004 | ptr = dereference_function_descriptor(ptr); | |
1005 | /* Fallthrough */ | |
1006 | case 'S': | |
1007 | case 's': | |
1008 | return symbol_string(buf, end, ptr, spec, *fmt); | |
1009 | case 'R': | |
1010 | case 'r': | |
1011 | return resource_string(buf, end, ptr, spec, fmt); | |
1012 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ | |
1013 | case 'm': /* Contiguous: 000102030405 */ | |
1014 | /* [mM]F (FDDI, bit reversed) */ | |
1015 | return mac_address_string(buf, end, ptr, spec, fmt); | |
1016 | case 'I': /* Formatted IP supported | |
1017 | * 4: 1.2.3.4 | |
1018 | * 6: 0001:0203:...:0708 | |
1019 | * 6c: 1::708 or 1::1.2.3.4 | |
1020 | */ | |
1021 | case 'i': /* Contiguous: | |
1022 | * 4: 001.002.003.004 | |
1023 | * 6: 000102...0f | |
1024 | */ | |
1025 | switch (fmt[1]) { | |
1026 | case '6': | |
1027 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
1028 | case '4': | |
1029 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
1030 | } | |
1031 | break; | |
1032 | case 'U': | |
1033 | return uuid_string(buf, end, ptr, spec, fmt); | |
1034 | case 'V': | |
1035 | return buf + vsnprintf(buf, end - buf, | |
1036 | ((struct va_format *)ptr)->fmt, | |
1037 | *(((struct va_format *)ptr)->va)); | |
1038 | } | |
1039 | spec.flags |= SMALL; | |
1040 | if (spec.field_width == -1) { | |
1041 | spec.field_width = 2 * sizeof(void *); | |
1042 | spec.flags |= ZEROPAD; | |
1043 | } | |
1044 | spec.base = 16; | |
1045 | ||
1046 | return number(buf, end, (unsigned long) ptr, spec); | |
1047 | } | |
1048 | ||
1049 | /* | |
1050 | * Helper function to decode printf style format. | |
1051 | * Each call decode a token from the format and return the | |
1052 | * number of characters read (or likely the delta where it wants | |
1053 | * to go on the next call). | |
1054 | * The decoded token is returned through the parameters | |
1055 | * | |
1056 | * 'h', 'l', or 'L' for integer fields | |
1057 | * 'z' support added 23/7/1999 S.H. | |
1058 | * 'z' changed to 'Z' --davidm 1/25/99 | |
1059 | * 't' added for ptrdiff_t | |
1060 | * | |
1061 | * @fmt: the format string | |
1062 | * @type of the token returned | |
1063 | * @flags: various flags such as +, -, # tokens.. | |
1064 | * @field_width: overwritten width | |
1065 | * @base: base of the number (octal, hex, ...) | |
1066 | * @precision: precision of a number | |
1067 | * @qualifier: qualifier of a number (long, size_t, ...) | |
1068 | */ | |
1069 | static noinline_for_stack | |
1070 | int format_decode(const char *fmt, struct printf_spec *spec) | |
1071 | { | |
1072 | const char *start = fmt; | |
1073 | ||
1074 | /* we finished early by reading the field width */ | |
1075 | if (spec->type == FORMAT_TYPE_WIDTH) { | |
1076 | if (spec->field_width < 0) { | |
1077 | spec->field_width = -spec->field_width; | |
1078 | spec->flags |= LEFT; | |
1079 | } | |
1080 | spec->type = FORMAT_TYPE_NONE; | |
1081 | goto precision; | |
1082 | } | |
1083 | ||
1084 | /* we finished early by reading the precision */ | |
1085 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
1086 | if (spec->precision < 0) | |
1087 | spec->precision = 0; | |
1088 | ||
1089 | spec->type = FORMAT_TYPE_NONE; | |
1090 | goto qualifier; | |
1091 | } | |
1092 | ||
1093 | /* By default */ | |
1094 | spec->type = FORMAT_TYPE_NONE; | |
1095 | ||
1096 | for (; *fmt ; ++fmt) { | |
1097 | if (*fmt == '%') | |
1098 | break; | |
1099 | } | |
1100 | ||
1101 | /* Return the current non-format string */ | |
1102 | if (fmt != start || !*fmt) | |
1103 | return fmt - start; | |
1104 | ||
1105 | /* Process flags */ | |
1106 | spec->flags = 0; | |
1107 | ||
1108 | while (1) { /* this also skips first '%' */ | |
1109 | bool found = true; | |
1110 | ||
1111 | ++fmt; | |
1112 | ||
1113 | switch (*fmt) { | |
1114 | case '-': spec->flags |= LEFT; break; | |
1115 | case '+': spec->flags |= PLUS; break; | |
1116 | case ' ': spec->flags |= SPACE; break; | |
1117 | case '#': spec->flags |= SPECIAL; break; | |
1118 | case '0': spec->flags |= ZEROPAD; break; | |
1119 | default: found = false; | |
1120 | } | |
1121 | ||
1122 | if (!found) | |
1123 | break; | |
1124 | } | |
1125 | ||
1126 | /* get field width */ | |
1127 | spec->field_width = -1; | |
1128 | ||
1129 | if (isdigit(*fmt)) | |
1130 | spec->field_width = skip_atoi(&fmt); | |
1131 | else if (*fmt == '*') { | |
1132 | /* it's the next argument */ | |
1133 | spec->type = FORMAT_TYPE_WIDTH; | |
1134 | return ++fmt - start; | |
1135 | } | |
1136 | ||
1137 | precision: | |
1138 | /* get the precision */ | |
1139 | spec->precision = -1; | |
1140 | if (*fmt == '.') { | |
1141 | ++fmt; | |
1142 | if (isdigit(*fmt)) { | |
1143 | spec->precision = skip_atoi(&fmt); | |
1144 | if (spec->precision < 0) | |
1145 | spec->precision = 0; | |
1146 | } else if (*fmt == '*') { | |
1147 | /* it's the next argument */ | |
1148 | spec->type = FORMAT_TYPE_PRECISION; | |
1149 | return ++fmt - start; | |
1150 | } | |
1151 | } | |
1152 | ||
1153 | qualifier: | |
1154 | /* get the conversion qualifier */ | |
1155 | spec->qualifier = -1; | |
1156 | if (*fmt == 'h' || TOLOWER(*fmt) == 'l' || | |
1157 | TOLOWER(*fmt) == 'z' || *fmt == 't') { | |
1158 | spec->qualifier = *fmt++; | |
1159 | if (unlikely(spec->qualifier == *fmt)) { | |
1160 | if (spec->qualifier == 'l') { | |
1161 | spec->qualifier = 'L'; | |
1162 | ++fmt; | |
1163 | } else if (spec->qualifier == 'h') { | |
1164 | spec->qualifier = 'H'; | |
1165 | ++fmt; | |
1166 | } | |
1167 | } | |
1168 | } | |
1169 | ||
1170 | /* default base */ | |
1171 | spec->base = 10; | |
1172 | switch (*fmt) { | |
1173 | case 'c': | |
1174 | spec->type = FORMAT_TYPE_CHAR; | |
1175 | return ++fmt - start; | |
1176 | ||
1177 | case 's': | |
1178 | spec->type = FORMAT_TYPE_STR; | |
1179 | return ++fmt - start; | |
1180 | ||
1181 | case 'p': | |
1182 | spec->type = FORMAT_TYPE_PTR; | |
1183 | return fmt - start; | |
1184 | /* skip alnum */ | |
1185 | ||
1186 | case 'n': | |
1187 | spec->type = FORMAT_TYPE_NRCHARS; | |
1188 | return ++fmt - start; | |
1189 | ||
1190 | case '%': | |
1191 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
1192 | return ++fmt - start; | |
1193 | ||
1194 | /* integer number formats - set up the flags and "break" */ | |
1195 | case 'o': | |
1196 | spec->base = 8; | |
1197 | break; | |
1198 | ||
1199 | case 'x': | |
1200 | spec->flags |= SMALL; | |
1201 | ||
1202 | case 'X': | |
1203 | spec->base = 16; | |
1204 | break; | |
1205 | ||
1206 | case 'd': | |
1207 | case 'i': | |
1208 | spec->flags |= SIGN; | |
1209 | case 'u': | |
1210 | break; | |
1211 | ||
1212 | default: | |
1213 | spec->type = FORMAT_TYPE_INVALID; | |
1214 | return fmt - start; | |
1215 | } | |
1216 | ||
1217 | if (spec->qualifier == 'L') | |
1218 | spec->type = FORMAT_TYPE_LONG_LONG; | |
1219 | else if (spec->qualifier == 'l') { | |
1220 | if (spec->flags & SIGN) | |
1221 | spec->type = FORMAT_TYPE_LONG; | |
1222 | else | |
1223 | spec->type = FORMAT_TYPE_ULONG; | |
1224 | } else if (TOLOWER(spec->qualifier) == 'z') { | |
1225 | spec->type = FORMAT_TYPE_SIZE_T; | |
1226 | } else if (spec->qualifier == 't') { | |
1227 | spec->type = FORMAT_TYPE_PTRDIFF; | |
1228 | } else if (spec->qualifier == 'H') { | |
1229 | if (spec->flags & SIGN) | |
1230 | spec->type = FORMAT_TYPE_BYTE; | |
1231 | else | |
1232 | spec->type = FORMAT_TYPE_UBYTE; | |
1233 | } else if (spec->qualifier == 'h') { | |
1234 | if (spec->flags & SIGN) | |
1235 | spec->type = FORMAT_TYPE_SHORT; | |
1236 | else | |
1237 | spec->type = FORMAT_TYPE_USHORT; | |
1238 | } else { | |
1239 | if (spec->flags & SIGN) | |
1240 | spec->type = FORMAT_TYPE_INT; | |
1241 | else | |
1242 | spec->type = FORMAT_TYPE_UINT; | |
1243 | } | |
1244 | ||
1245 | return ++fmt - start; | |
1246 | } | |
1247 | ||
1248 | /** | |
1249 | * vsnprintf - Format a string and place it in a buffer | |
1250 | * @buf: The buffer to place the result into | |
1251 | * @size: The size of the buffer, including the trailing null space | |
1252 | * @fmt: The format string to use | |
1253 | * @args: Arguments for the format string | |
1254 | * | |
1255 | * This function follows C99 vsnprintf, but has some extensions: | |
1256 | * %pS output the name of a text symbol with offset | |
1257 | * %ps output the name of a text symbol without offset | |
1258 | * %pF output the name of a function pointer with its offset | |
1259 | * %pf output the name of a function pointer without its offset | |
1260 | * %pR output the address range in a struct resource with decoded flags | |
1261 | * %pr output the address range in a struct resource with raw flags | |
1262 | * %pM output a 6-byte MAC address with colons | |
1263 | * %pm output a 6-byte MAC address without colons | |
1264 | * %pI4 print an IPv4 address without leading zeros | |
1265 | * %pi4 print an IPv4 address with leading zeros | |
1266 | * %pI6 print an IPv6 address with colons | |
1267 | * %pi6 print an IPv6 address without colons | |
1268 | * %pI6c print an IPv6 address as specified by | |
1269 | * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00 | |
1270 | * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper | |
1271 | * case. | |
1272 | * %n is ignored | |
1273 | * | |
1274 | * The return value is the number of characters which would | |
1275 | * be generated for the given input, excluding the trailing | |
1276 | * '\0', as per ISO C99. If you want to have the exact | |
1277 | * number of characters written into @buf as return value | |
1278 | * (not including the trailing '\0'), use vscnprintf(). If the | |
1279 | * return is greater than or equal to @size, the resulting | |
1280 | * string is truncated. | |
1281 | * | |
1282 | * Call this function if you are already dealing with a va_list. | |
1283 | * You probably want snprintf() instead. | |
1284 | */ | |
1285 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1286 | { | |
1287 | unsigned long long num; | |
1288 | char *str, *end; | |
1289 | struct printf_spec spec = {0}; | |
1290 | ||
1291 | /* Reject out-of-range values early. Large positive sizes are | |
1292 | used for unknown buffer sizes. */ | |
1293 | if (WARN_ON_ONCE((int) size < 0)) | |
1294 | return 0; | |
1295 | ||
1296 | str = buf; | |
1297 | end = buf + size; | |
1298 | ||
1299 | /* Make sure end is always >= buf */ | |
1300 | if (end < buf) { | |
1301 | end = ((void *)-1); | |
1302 | size = end - buf; | |
1303 | } | |
1304 | ||
1305 | while (*fmt) { | |
1306 | const char *old_fmt = fmt; | |
1307 | int read = format_decode(fmt, &spec); | |
1308 | ||
1309 | fmt += read; | |
1310 | ||
1311 | switch (spec.type) { | |
1312 | case FORMAT_TYPE_NONE: { | |
1313 | int copy = read; | |
1314 | if (str < end) { | |
1315 | if (copy > end - str) | |
1316 | copy = end - str; | |
1317 | memcpy(str, old_fmt, copy); | |
1318 | } | |
1319 | str += read; | |
1320 | break; | |
1321 | } | |
1322 | ||
1323 | case FORMAT_TYPE_WIDTH: | |
1324 | spec.field_width = va_arg(args, int); | |
1325 | break; | |
1326 | ||
1327 | case FORMAT_TYPE_PRECISION: | |
1328 | spec.precision = va_arg(args, int); | |
1329 | break; | |
1330 | ||
1331 | case FORMAT_TYPE_CHAR: { | |
1332 | char c; | |
1333 | ||
1334 | if (!(spec.flags & LEFT)) { | |
1335 | while (--spec.field_width > 0) { | |
1336 | if (str < end) | |
1337 | *str = ' '; | |
1338 | ++str; | |
1339 | ||
1340 | } | |
1341 | } | |
1342 | c = (unsigned char) va_arg(args, int); | |
1343 | if (str < end) | |
1344 | *str = c; | |
1345 | ++str; | |
1346 | while (--spec.field_width > 0) { | |
1347 | if (str < end) | |
1348 | *str = ' '; | |
1349 | ++str; | |
1350 | } | |
1351 | break; | |
1352 | } | |
1353 | ||
1354 | case FORMAT_TYPE_STR: | |
1355 | str = string(str, end, va_arg(args, char *), spec); | |
1356 | break; | |
1357 | ||
1358 | case FORMAT_TYPE_PTR: | |
1359 | str = pointer(fmt+1, str, end, va_arg(args, void *), | |
1360 | spec); | |
1361 | while (isalnum(*fmt)) | |
1362 | fmt++; | |
1363 | break; | |
1364 | ||
1365 | case FORMAT_TYPE_PERCENT_CHAR: | |
1366 | if (str < end) | |
1367 | *str = '%'; | |
1368 | ++str; | |
1369 | break; | |
1370 | ||
1371 | case FORMAT_TYPE_INVALID: | |
1372 | if (str < end) | |
1373 | *str = '%'; | |
1374 | ++str; | |
1375 | break; | |
1376 | ||
1377 | case FORMAT_TYPE_NRCHARS: { | |
1378 | u8 qualifier = spec.qualifier; | |
1379 | ||
1380 | if (qualifier == 'l') { | |
1381 | long *ip = va_arg(args, long *); | |
1382 | *ip = (str - buf); | |
1383 | } else if (TOLOWER(qualifier) == 'z') { | |
1384 | size_t *ip = va_arg(args, size_t *); | |
1385 | *ip = (str - buf); | |
1386 | } else { | |
1387 | int *ip = va_arg(args, int *); | |
1388 | *ip = (str - buf); | |
1389 | } | |
1390 | break; | |
1391 | } | |
1392 | ||
1393 | default: | |
1394 | switch (spec.type) { | |
1395 | case FORMAT_TYPE_LONG_LONG: | |
1396 | num = va_arg(args, long long); | |
1397 | break; | |
1398 | case FORMAT_TYPE_ULONG: | |
1399 | num = va_arg(args, unsigned long); | |
1400 | break; | |
1401 | case FORMAT_TYPE_LONG: | |
1402 | num = va_arg(args, long); | |
1403 | break; | |
1404 | case FORMAT_TYPE_SIZE_T: | |
1405 | num = va_arg(args, size_t); | |
1406 | break; | |
1407 | case FORMAT_TYPE_PTRDIFF: | |
1408 | num = va_arg(args, ptrdiff_t); | |
1409 | break; | |
1410 | case FORMAT_TYPE_UBYTE: | |
1411 | num = (unsigned char) va_arg(args, int); | |
1412 | break; | |
1413 | case FORMAT_TYPE_BYTE: | |
1414 | num = (signed char) va_arg(args, int); | |
1415 | break; | |
1416 | case FORMAT_TYPE_USHORT: | |
1417 | num = (unsigned short) va_arg(args, int); | |
1418 | break; | |
1419 | case FORMAT_TYPE_SHORT: | |
1420 | num = (short) va_arg(args, int); | |
1421 | break; | |
1422 | case FORMAT_TYPE_INT: | |
1423 | num = (int) va_arg(args, int); | |
1424 | break; | |
1425 | default: | |
1426 | num = va_arg(args, unsigned int); | |
1427 | } | |
1428 | ||
1429 | str = number(str, end, num, spec); | |
1430 | } | |
1431 | } | |
1432 | ||
1433 | if (size > 0) { | |
1434 | if (str < end) | |
1435 | *str = '\0'; | |
1436 | else | |
1437 | end[-1] = '\0'; | |
1438 | } | |
1439 | ||
1440 | /* the trailing null byte doesn't count towards the total */ | |
1441 | return str-buf; | |
1442 | ||
1443 | } | |
1444 | EXPORT_SYMBOL(vsnprintf); | |
1445 | ||
1446 | /** | |
1447 | * vscnprintf - Format a string and place it in a buffer | |
1448 | * @buf: The buffer to place the result into | |
1449 | * @size: The size of the buffer, including the trailing null space | |
1450 | * @fmt: The format string to use | |
1451 | * @args: Arguments for the format string | |
1452 | * | |
1453 | * The return value is the number of characters which have been written into | |
1454 | * the @buf not including the trailing '\0'. If @size is <= 0 the function | |
1455 | * returns 0. | |
1456 | * | |
1457 | * Call this function if you are already dealing with a va_list. | |
1458 | * You probably want scnprintf() instead. | |
1459 | * | |
1460 | * See the vsnprintf() documentation for format string extensions over C99. | |
1461 | */ | |
1462 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1463 | { | |
1464 | int i; | |
1465 | ||
1466 | i = vsnprintf(buf, size, fmt, args); | |
1467 | ||
1468 | return (i >= size) ? (size - 1) : i; | |
1469 | } | |
1470 | EXPORT_SYMBOL(vscnprintf); | |
1471 | ||
1472 | /** | |
1473 | * snprintf - Format a string and place it in a buffer | |
1474 | * @buf: The buffer to place the result into | |
1475 | * @size: The size of the buffer, including the trailing null space | |
1476 | * @fmt: The format string to use | |
1477 | * @...: Arguments for the format string | |
1478 | * | |
1479 | * The return value is the number of characters which would be | |
1480 | * generated for the given input, excluding the trailing null, | |
1481 | * as per ISO C99. If the return is greater than or equal to | |
1482 | * @size, the resulting string is truncated. | |
1483 | * | |
1484 | * See the vsnprintf() documentation for format string extensions over C99. | |
1485 | */ | |
1486 | int snprintf(char *buf, size_t size, const char *fmt, ...) | |
1487 | { | |
1488 | va_list args; | |
1489 | int i; | |
1490 | ||
1491 | va_start(args, fmt); | |
1492 | i = vsnprintf(buf, size, fmt, args); | |
1493 | va_end(args); | |
1494 | ||
1495 | return i; | |
1496 | } | |
1497 | EXPORT_SYMBOL(snprintf); | |
1498 | ||
1499 | /** | |
1500 | * scnprintf - Format a string and place it in a buffer | |
1501 | * @buf: The buffer to place the result into | |
1502 | * @size: The size of the buffer, including the trailing null space | |
1503 | * @fmt: The format string to use | |
1504 | * @...: Arguments for the format string | |
1505 | * | |
1506 | * The return value is the number of characters written into @buf not including | |
1507 | * the trailing '\0'. If @size is == 0 the function returns 0. | |
1508 | */ | |
1509 | ||
1510 | int scnprintf(char *buf, size_t size, const char *fmt, ...) | |
1511 | { | |
1512 | va_list args; | |
1513 | int i; | |
1514 | ||
1515 | va_start(args, fmt); | |
1516 | i = vsnprintf(buf, size, fmt, args); | |
1517 | va_end(args); | |
1518 | ||
1519 | if (likely(i < size)) | |
1520 | return i; | |
1521 | if (size != 0) | |
1522 | return size - 1; | |
1523 | return 0; | |
1524 | } | |
1525 | EXPORT_SYMBOL(scnprintf); | |
1526 | ||
1527 | /** | |
1528 | * vsprintf - Format a string and place it in a buffer | |
1529 | * @buf: The buffer to place the result into | |
1530 | * @fmt: The format string to use | |
1531 | * @args: Arguments for the format string | |
1532 | * | |
1533 | * The function returns the number of characters written | |
1534 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid | |
1535 | * buffer overflows. | |
1536 | * | |
1537 | * Call this function if you are already dealing with a va_list. | |
1538 | * You probably want sprintf() instead. | |
1539 | * | |
1540 | * See the vsnprintf() documentation for format string extensions over C99. | |
1541 | */ | |
1542 | int vsprintf(char *buf, const char *fmt, va_list args) | |
1543 | { | |
1544 | return vsnprintf(buf, INT_MAX, fmt, args); | |
1545 | } | |
1546 | EXPORT_SYMBOL(vsprintf); | |
1547 | ||
1548 | /** | |
1549 | * sprintf - Format a string and place it in a buffer | |
1550 | * @buf: The buffer to place the result into | |
1551 | * @fmt: The format string to use | |
1552 | * @...: Arguments for the format string | |
1553 | * | |
1554 | * The function returns the number of characters written | |
1555 | * into @buf. Use snprintf() or scnprintf() in order to avoid | |
1556 | * buffer overflows. | |
1557 | * | |
1558 | * See the vsnprintf() documentation for format string extensions over C99. | |
1559 | */ | |
1560 | int sprintf(char *buf, const char *fmt, ...) | |
1561 | { | |
1562 | va_list args; | |
1563 | int i; | |
1564 | ||
1565 | va_start(args, fmt); | |
1566 | i = vsnprintf(buf, INT_MAX, fmt, args); | |
1567 | va_end(args); | |
1568 | ||
1569 | return i; | |
1570 | } | |
1571 | EXPORT_SYMBOL(sprintf); | |
1572 | ||
1573 | #ifdef CONFIG_BINARY_PRINTF | |
1574 | /* | |
1575 | * bprintf service: | |
1576 | * vbin_printf() - VA arguments to binary data | |
1577 | * bstr_printf() - Binary data to text string | |
1578 | */ | |
1579 | ||
1580 | /** | |
1581 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
1582 | * @bin_buf: The buffer to place args' binary value | |
1583 | * @size: The size of the buffer(by words(32bits), not characters) | |
1584 | * @fmt: The format string to use | |
1585 | * @args: Arguments for the format string | |
1586 | * | |
1587 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
1588 | * is skiped. | |
1589 | * | |
1590 | * The return value is the number of words(32bits) which would be generated for | |
1591 | * the given input. | |
1592 | * | |
1593 | * NOTE: | |
1594 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
1595 | * valid for bstr_printf(). | |
1596 | */ | |
1597 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
1598 | { | |
1599 | struct printf_spec spec = {0}; | |
1600 | char *str, *end; | |
1601 | ||
1602 | str = (char *)bin_buf; | |
1603 | end = (char *)(bin_buf + size); | |
1604 | ||
1605 | #define save_arg(type) \ | |
1606 | do { \ | |
1607 | if (sizeof(type) == 8) { \ | |
1608 | unsigned long long value; \ | |
1609 | str = PTR_ALIGN(str, sizeof(u32)); \ | |
1610 | value = va_arg(args, unsigned long long); \ | |
1611 | if (str + sizeof(type) <= end) { \ | |
1612 | *(u32 *)str = *(u32 *)&value; \ | |
1613 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ | |
1614 | } \ | |
1615 | } else { \ | |
1616 | unsigned long value; \ | |
1617 | str = PTR_ALIGN(str, sizeof(type)); \ | |
1618 | value = va_arg(args, int); \ | |
1619 | if (str + sizeof(type) <= end) \ | |
1620 | *(typeof(type) *)str = (type)value; \ | |
1621 | } \ | |
1622 | str += sizeof(type); \ | |
1623 | } while (0) | |
1624 | ||
1625 | while (*fmt) { | |
1626 | int read = format_decode(fmt, &spec); | |
1627 | ||
1628 | fmt += read; | |
1629 | ||
1630 | switch (spec.type) { | |
1631 | case FORMAT_TYPE_NONE: | |
1632 | case FORMAT_TYPE_INVALID: | |
1633 | case FORMAT_TYPE_PERCENT_CHAR: | |
1634 | break; | |
1635 | ||
1636 | case FORMAT_TYPE_WIDTH: | |
1637 | case FORMAT_TYPE_PRECISION: | |
1638 | save_arg(int); | |
1639 | break; | |
1640 | ||
1641 | case FORMAT_TYPE_CHAR: | |
1642 | save_arg(char); | |
1643 | break; | |
1644 | ||
1645 | case FORMAT_TYPE_STR: { | |
1646 | const char *save_str = va_arg(args, char *); | |
1647 | size_t len; | |
1648 | ||
1649 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE | |
1650 | || (unsigned long)save_str < PAGE_SIZE) | |
1651 | save_str = "(null)"; | |
1652 | len = strlen(save_str) + 1; | |
1653 | if (str + len < end) | |
1654 | memcpy(str, save_str, len); | |
1655 | str += len; | |
1656 | break; | |
1657 | } | |
1658 | ||
1659 | case FORMAT_TYPE_PTR: | |
1660 | save_arg(void *); | |
1661 | /* skip all alphanumeric pointer suffixes */ | |
1662 | while (isalnum(*fmt)) | |
1663 | fmt++; | |
1664 | break; | |
1665 | ||
1666 | case FORMAT_TYPE_NRCHARS: { | |
1667 | /* skip %n 's argument */ | |
1668 | u8 qualifier = spec.qualifier; | |
1669 | void *skip_arg; | |
1670 | if (qualifier == 'l') | |
1671 | skip_arg = va_arg(args, long *); | |
1672 | else if (TOLOWER(qualifier) == 'z') | |
1673 | skip_arg = va_arg(args, size_t *); | |
1674 | else | |
1675 | skip_arg = va_arg(args, int *); | |
1676 | break; | |
1677 | } | |
1678 | ||
1679 | default: | |
1680 | switch (spec.type) { | |
1681 | ||
1682 | case FORMAT_TYPE_LONG_LONG: | |
1683 | save_arg(long long); | |
1684 | break; | |
1685 | case FORMAT_TYPE_ULONG: | |
1686 | case FORMAT_TYPE_LONG: | |
1687 | save_arg(unsigned long); | |
1688 | break; | |
1689 | case FORMAT_TYPE_SIZE_T: | |
1690 | save_arg(size_t); | |
1691 | break; | |
1692 | case FORMAT_TYPE_PTRDIFF: | |
1693 | save_arg(ptrdiff_t); | |
1694 | break; | |
1695 | case FORMAT_TYPE_UBYTE: | |
1696 | case FORMAT_TYPE_BYTE: | |
1697 | save_arg(char); | |
1698 | break; | |
1699 | case FORMAT_TYPE_USHORT: | |
1700 | case FORMAT_TYPE_SHORT: | |
1701 | save_arg(short); | |
1702 | break; | |
1703 | default: | |
1704 | save_arg(int); | |
1705 | } | |
1706 | } | |
1707 | } | |
1708 | ||
1709 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; | |
1710 | #undef save_arg | |
1711 | } | |
1712 | EXPORT_SYMBOL_GPL(vbin_printf); | |
1713 | ||
1714 | /** | |
1715 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
1716 | * @buf: The buffer to place the result into | |
1717 | * @size: The size of the buffer, including the trailing null space | |
1718 | * @fmt: The format string to use | |
1719 | * @bin_buf: Binary arguments for the format string | |
1720 | * | |
1721 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
1722 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
1723 | * a binary buffer that generated by vbin_printf. | |
1724 | * | |
1725 | * The format follows C99 vsnprintf, but has some extensions: | |
1726 | * see vsnprintf comment for details. | |
1727 | * | |
1728 | * The return value is the number of characters which would | |
1729 | * be generated for the given input, excluding the trailing | |
1730 | * '\0', as per ISO C99. If you want to have the exact | |
1731 | * number of characters written into @buf as return value | |
1732 | * (not including the trailing '\0'), use vscnprintf(). If the | |
1733 | * return is greater than or equal to @size, the resulting | |
1734 | * string is truncated. | |
1735 | */ | |
1736 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
1737 | { | |
1738 | struct printf_spec spec = {0}; | |
1739 | char *str, *end; | |
1740 | const char *args = (const char *)bin_buf; | |
1741 | ||
1742 | if (WARN_ON_ONCE((int) size < 0)) | |
1743 | return 0; | |
1744 | ||
1745 | str = buf; | |
1746 | end = buf + size; | |
1747 | ||
1748 | #define get_arg(type) \ | |
1749 | ({ \ | |
1750 | typeof(type) value; \ | |
1751 | if (sizeof(type) == 8) { \ | |
1752 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
1753 | *(u32 *)&value = *(u32 *)args; \ | |
1754 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
1755 | } else { \ | |
1756 | args = PTR_ALIGN(args, sizeof(type)); \ | |
1757 | value = *(typeof(type) *)args; \ | |
1758 | } \ | |
1759 | args += sizeof(type); \ | |
1760 | value; \ | |
1761 | }) | |
1762 | ||
1763 | /* Make sure end is always >= buf */ | |
1764 | if (end < buf) { | |
1765 | end = ((void *)-1); | |
1766 | size = end - buf; | |
1767 | } | |
1768 | ||
1769 | while (*fmt) { | |
1770 | const char *old_fmt = fmt; | |
1771 | int read = format_decode(fmt, &spec); | |
1772 | ||
1773 | fmt += read; | |
1774 | ||
1775 | switch (spec.type) { | |
1776 | case FORMAT_TYPE_NONE: { | |
1777 | int copy = read; | |
1778 | if (str < end) { | |
1779 | if (copy > end - str) | |
1780 | copy = end - str; | |
1781 | memcpy(str, old_fmt, copy); | |
1782 | } | |
1783 | str += read; | |
1784 | break; | |
1785 | } | |
1786 | ||
1787 | case FORMAT_TYPE_WIDTH: | |
1788 | spec.field_width = get_arg(int); | |
1789 | break; | |
1790 | ||
1791 | case FORMAT_TYPE_PRECISION: | |
1792 | spec.precision = get_arg(int); | |
1793 | break; | |
1794 | ||
1795 | case FORMAT_TYPE_CHAR: { | |
1796 | char c; | |
1797 | ||
1798 | if (!(spec.flags & LEFT)) { | |
1799 | while (--spec.field_width > 0) { | |
1800 | if (str < end) | |
1801 | *str = ' '; | |
1802 | ++str; | |
1803 | } | |
1804 | } | |
1805 | c = (unsigned char) get_arg(char); | |
1806 | if (str < end) | |
1807 | *str = c; | |
1808 | ++str; | |
1809 | while (--spec.field_width > 0) { | |
1810 | if (str < end) | |
1811 | *str = ' '; | |
1812 | ++str; | |
1813 | } | |
1814 | break; | |
1815 | } | |
1816 | ||
1817 | case FORMAT_TYPE_STR: { | |
1818 | const char *str_arg = args; | |
1819 | args += strlen(str_arg) + 1; | |
1820 | str = string(str, end, (char *)str_arg, spec); | |
1821 | break; | |
1822 | } | |
1823 | ||
1824 | case FORMAT_TYPE_PTR: | |
1825 | str = pointer(fmt+1, str, end, get_arg(void *), spec); | |
1826 | while (isalnum(*fmt)) | |
1827 | fmt++; | |
1828 | break; | |
1829 | ||
1830 | case FORMAT_TYPE_PERCENT_CHAR: | |
1831 | case FORMAT_TYPE_INVALID: | |
1832 | if (str < end) | |
1833 | *str = '%'; | |
1834 | ++str; | |
1835 | break; | |
1836 | ||
1837 | case FORMAT_TYPE_NRCHARS: | |
1838 | /* skip */ | |
1839 | break; | |
1840 | ||
1841 | default: { | |
1842 | unsigned long long num; | |
1843 | ||
1844 | switch (spec.type) { | |
1845 | ||
1846 | case FORMAT_TYPE_LONG_LONG: | |
1847 | num = get_arg(long long); | |
1848 | break; | |
1849 | case FORMAT_TYPE_ULONG: | |
1850 | case FORMAT_TYPE_LONG: | |
1851 | num = get_arg(unsigned long); | |
1852 | break; | |
1853 | case FORMAT_TYPE_SIZE_T: | |
1854 | num = get_arg(size_t); | |
1855 | break; | |
1856 | case FORMAT_TYPE_PTRDIFF: | |
1857 | num = get_arg(ptrdiff_t); | |
1858 | break; | |
1859 | case FORMAT_TYPE_UBYTE: | |
1860 | num = get_arg(unsigned char); | |
1861 | break; | |
1862 | case FORMAT_TYPE_BYTE: | |
1863 | num = get_arg(signed char); | |
1864 | break; | |
1865 | case FORMAT_TYPE_USHORT: | |
1866 | num = get_arg(unsigned short); | |
1867 | break; | |
1868 | case FORMAT_TYPE_SHORT: | |
1869 | num = get_arg(short); | |
1870 | break; | |
1871 | case FORMAT_TYPE_UINT: | |
1872 | num = get_arg(unsigned int); | |
1873 | break; | |
1874 | default: | |
1875 | num = get_arg(int); | |
1876 | } | |
1877 | ||
1878 | str = number(str, end, num, spec); | |
1879 | } /* default: */ | |
1880 | } /* switch(spec.type) */ | |
1881 | } /* while(*fmt) */ | |
1882 | ||
1883 | if (size > 0) { | |
1884 | if (str < end) | |
1885 | *str = '\0'; | |
1886 | else | |
1887 | end[-1] = '\0'; | |
1888 | } | |
1889 | ||
1890 | #undef get_arg | |
1891 | ||
1892 | /* the trailing null byte doesn't count towards the total */ | |
1893 | return str - buf; | |
1894 | } | |
1895 | EXPORT_SYMBOL_GPL(bstr_printf); | |
1896 | ||
1897 | /** | |
1898 | * bprintf - Parse a format string and place args' binary value in a buffer | |
1899 | * @bin_buf: The buffer to place args' binary value | |
1900 | * @size: The size of the buffer(by words(32bits), not characters) | |
1901 | * @fmt: The format string to use | |
1902 | * @...: Arguments for the format string | |
1903 | * | |
1904 | * The function returns the number of words(u32) written | |
1905 | * into @bin_buf. | |
1906 | */ | |
1907 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
1908 | { | |
1909 | va_list args; | |
1910 | int ret; | |
1911 | ||
1912 | va_start(args, fmt); | |
1913 | ret = vbin_printf(bin_buf, size, fmt, args); | |
1914 | va_end(args); | |
1915 | ||
1916 | return ret; | |
1917 | } | |
1918 | EXPORT_SYMBOL_GPL(bprintf); | |
1919 | ||
1920 | #endif /* CONFIG_BINARY_PRINTF */ | |
1921 | ||
1922 | /** | |
1923 | * vsscanf - Unformat a buffer into a list of arguments | |
1924 | * @buf: input buffer | |
1925 | * @fmt: format of buffer | |
1926 | * @args: arguments | |
1927 | */ | |
1928 | int vsscanf(const char *buf, const char *fmt, va_list args) | |
1929 | { | |
1930 | const char *str = buf; | |
1931 | char *next; | |
1932 | char digit; | |
1933 | int num = 0; | |
1934 | u8 qualifier; | |
1935 | u8 base; | |
1936 | s16 field_width; | |
1937 | bool is_sign; | |
1938 | ||
1939 | while (*fmt && *str) { | |
1940 | /* skip any white space in format */ | |
1941 | /* white space in format matchs any amount of | |
1942 | * white space, including none, in the input. | |
1943 | */ | |
1944 | if (isspace(*fmt)) { | |
1945 | fmt = skip_spaces(++fmt); | |
1946 | str = skip_spaces(str); | |
1947 | } | |
1948 | ||
1949 | /* anything that is not a conversion must match exactly */ | |
1950 | if (*fmt != '%' && *fmt) { | |
1951 | if (*fmt++ != *str++) | |
1952 | break; | |
1953 | continue; | |
1954 | } | |
1955 | ||
1956 | if (!*fmt) | |
1957 | break; | |
1958 | ++fmt; | |
1959 | ||
1960 | /* skip this conversion. | |
1961 | * advance both strings to next white space | |
1962 | */ | |
1963 | if (*fmt == '*') { | |
1964 | while (!isspace(*fmt) && *fmt != '%' && *fmt) | |
1965 | fmt++; | |
1966 | while (!isspace(*str) && *str) | |
1967 | str++; | |
1968 | continue; | |
1969 | } | |
1970 | ||
1971 | /* get field width */ | |
1972 | field_width = -1; | |
1973 | if (isdigit(*fmt)) | |
1974 | field_width = skip_atoi(&fmt); | |
1975 | ||
1976 | /* get conversion qualifier */ | |
1977 | qualifier = -1; | |
1978 | if (*fmt == 'h' || TOLOWER(*fmt) == 'l' || | |
1979 | TOLOWER(*fmt) == 'z') { | |
1980 | qualifier = *fmt++; | |
1981 | if (unlikely(qualifier == *fmt)) { | |
1982 | if (qualifier == 'h') { | |
1983 | qualifier = 'H'; | |
1984 | fmt++; | |
1985 | } else if (qualifier == 'l') { | |
1986 | qualifier = 'L'; | |
1987 | fmt++; | |
1988 | } | |
1989 | } | |
1990 | } | |
1991 | ||
1992 | if (!*fmt || !*str) | |
1993 | break; | |
1994 | ||
1995 | base = 10; | |
1996 | is_sign = 0; | |
1997 | ||
1998 | switch (*fmt++) { | |
1999 | case 'c': | |
2000 | { | |
2001 | char *s = (char *)va_arg(args, char*); | |
2002 | if (field_width == -1) | |
2003 | field_width = 1; | |
2004 | do { | |
2005 | *s++ = *str++; | |
2006 | } while (--field_width > 0 && *str); | |
2007 | num++; | |
2008 | } | |
2009 | continue; | |
2010 | case 's': | |
2011 | { | |
2012 | char *s = (char *)va_arg(args, char *); | |
2013 | if (field_width == -1) | |
2014 | field_width = SHRT_MAX; | |
2015 | /* first, skip leading white space in buffer */ | |
2016 | str = skip_spaces(str); | |
2017 | ||
2018 | /* now copy until next white space */ | |
2019 | while (*str && !isspace(*str) && field_width--) | |
2020 | *s++ = *str++; | |
2021 | *s = '\0'; | |
2022 | num++; | |
2023 | } | |
2024 | continue; | |
2025 | case 'n': | |
2026 | /* return number of characters read so far */ | |
2027 | { | |
2028 | int *i = (int *)va_arg(args, int*); | |
2029 | *i = str - buf; | |
2030 | } | |
2031 | continue; | |
2032 | case 'o': | |
2033 | base = 8; | |
2034 | break; | |
2035 | case 'x': | |
2036 | case 'X': | |
2037 | base = 16; | |
2038 | break; | |
2039 | case 'i': | |
2040 | base = 0; | |
2041 | case 'd': | |
2042 | is_sign = 1; | |
2043 | case 'u': | |
2044 | break; | |
2045 | case '%': | |
2046 | /* looking for '%' in str */ | |
2047 | if (*str++ != '%') | |
2048 | return num; | |
2049 | continue; | |
2050 | default: | |
2051 | /* invalid format; stop here */ | |
2052 | return num; | |
2053 | } | |
2054 | ||
2055 | /* have some sort of integer conversion. | |
2056 | * first, skip white space in buffer. | |
2057 | */ | |
2058 | str = skip_spaces(str); | |
2059 | ||
2060 | digit = *str; | |
2061 | if (is_sign && digit == '-') | |
2062 | digit = *(str + 1); | |
2063 | ||
2064 | if (!digit | |
2065 | || (base == 16 && !isxdigit(digit)) | |
2066 | || (base == 10 && !isdigit(digit)) | |
2067 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
2068 | || (base == 0 && !isdigit(digit))) | |
2069 | break; | |
2070 | ||
2071 | switch (qualifier) { | |
2072 | case 'H': /* that's 'hh' in format */ | |
2073 | if (is_sign) { | |
2074 | signed char *s = (signed char *)va_arg(args, signed char *); | |
2075 | *s = (signed char)simple_strtol(str, &next, base); | |
2076 | } else { | |
2077 | unsigned char *s = (unsigned char *)va_arg(args, unsigned char *); | |
2078 | *s = (unsigned char)simple_strtoul(str, &next, base); | |
2079 | } | |
2080 | break; | |
2081 | case 'h': | |
2082 | if (is_sign) { | |
2083 | short *s = (short *)va_arg(args, short *); | |
2084 | *s = (short)simple_strtol(str, &next, base); | |
2085 | } else { | |
2086 | unsigned short *s = (unsigned short *)va_arg(args, unsigned short *); | |
2087 | *s = (unsigned short)simple_strtoul(str, &next, base); | |
2088 | } | |
2089 | break; | |
2090 | case 'l': | |
2091 | if (is_sign) { | |
2092 | long *l = (long *)va_arg(args, long *); | |
2093 | *l = simple_strtol(str, &next, base); | |
2094 | } else { | |
2095 | unsigned long *l = (unsigned long *)va_arg(args, unsigned long *); | |
2096 | *l = simple_strtoul(str, &next, base); | |
2097 | } | |
2098 | break; | |
2099 | case 'L': | |
2100 | if (is_sign) { | |
2101 | long long *l = (long long *)va_arg(args, long long *); | |
2102 | *l = simple_strtoll(str, &next, base); | |
2103 | } else { | |
2104 | unsigned long long *l = (unsigned long long *)va_arg(args, unsigned long long *); | |
2105 | *l = simple_strtoull(str, &next, base); | |
2106 | } | |
2107 | break; | |
2108 | case 'Z': | |
2109 | case 'z': | |
2110 | { | |
2111 | size_t *s = (size_t *)va_arg(args, size_t *); | |
2112 | *s = (size_t)simple_strtoul(str, &next, base); | |
2113 | } | |
2114 | break; | |
2115 | default: | |
2116 | if (is_sign) { | |
2117 | int *i = (int *)va_arg(args, int *); | |
2118 | *i = (int)simple_strtol(str, &next, base); | |
2119 | } else { | |
2120 | unsigned int *i = (unsigned int *)va_arg(args, unsigned int*); | |
2121 | *i = (unsigned int)simple_strtoul(str, &next, base); | |
2122 | } | |
2123 | break; | |
2124 | } | |
2125 | num++; | |
2126 | ||
2127 | if (!next) | |
2128 | break; | |
2129 | str = next; | |
2130 | } | |
2131 | ||
2132 | /* | |
2133 | * Now we've come all the way through so either the input string or the | |
2134 | * format ended. In the former case, there can be a %n at the current | |
2135 | * position in the format that needs to be filled. | |
2136 | */ | |
2137 | if (*fmt == '%' && *(fmt + 1) == 'n') { | |
2138 | int *p = (int *)va_arg(args, int *); | |
2139 | *p = str - buf; | |
2140 | } | |
2141 | ||
2142 | return num; | |
2143 | } | |
2144 | EXPORT_SYMBOL(vsscanf); | |
2145 | ||
2146 | /** | |
2147 | * sscanf - Unformat a buffer into a list of arguments | |
2148 | * @buf: input buffer | |
2149 | * @fmt: formatting of buffer | |
2150 | * @...: resulting arguments | |
2151 | */ | |
2152 | int sscanf(const char *buf, const char *fmt, ...) | |
2153 | { | |
2154 | va_list args; | |
2155 | int i; | |
2156 | ||
2157 | va_start(args, fmt); | |
2158 | i = vsscanf(buf, fmt, args); | |
2159 | va_end(args); | |
2160 | ||
2161 | return i; | |
2162 | } | |
2163 | EXPORT_SYMBOL(sscanf); |