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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 | size_t len; |
150 | |
151 | *res = 0; |
152 | len = strlen(cp); |
153 | if (len == 0) |
154 | return -EINVAL; |
155 | |
156 | val = simple_strtoul(cp, &tail, base); |
157 | if (tail == cp) |
158 | return -EINVAL; |
159 | |
160 | if ((*tail == '\0') || |
161 | ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) { |
162 | *res = val; |
163 | return 0; |
164 | } |
165 | |
166 | return -EINVAL; |
167 | } |
168 | EXPORT_SYMBOL(strict_strtoul); |
169 | |
170 | /** |
171 | * strict_strtol - convert a string to a long strictly |
172 | * @cp: The string to be converted |
173 | * @base: The number base to use |
174 | * @res: The converted result value |
175 | * |
176 | * strict_strtol is similiar to strict_strtoul, but it allows the first |
177 | * character of a string is '-'. |
178 | * |
179 | * It returns 0 if conversion is successful and *res is set to the converted |
180 | * value, otherwise it returns -EINVAL and *res is set to 0. |
181 | */ |
182 | int strict_strtol(const char *cp, unsigned int base, long *res) |
183 | { |
184 | int ret; |
185 | if (*cp == '-') { |
186 | ret = strict_strtoul(cp + 1, base, (unsigned long *)res); |
187 | if (!ret) |
188 | *res = -(*res); |
189 | } else { |
190 | ret = strict_strtoul(cp, base, (unsigned long *)res); |
191 | } |
192 | |
193 | return ret; |
194 | } |
195 | EXPORT_SYMBOL(strict_strtol); |
196 | |
197 | /** |
198 | * strict_strtoull - convert a string to an unsigned long long strictly |
199 | * @cp: The string to be converted |
200 | * @base: The number base to use |
201 | * @res: The converted result value |
202 | * |
203 | * strict_strtoull converts a string to an unsigned long long only if the |
204 | * string is really an unsigned long long string, any string containing |
205 | * any invalid char at the tail will be rejected and -EINVAL is returned, |
206 | * only a newline char at the tail is acceptible because people generally |
207 | * change a module parameter in the following way: |
208 | * |
209 | * echo 1024 > /sys/module/e1000/parameters/copybreak |
210 | * |
211 | * echo will append a newline to the tail of the string. |
212 | * |
213 | * It returns 0 if conversion is successful and *res is set to the converted |
214 | * value, otherwise it returns -EINVAL and *res is set to 0. |
215 | * |
216 | * simple_strtoull just ignores the successive invalid characters and |
217 | * return the converted value of prefix part of the string. |
218 | */ |
219 | int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res) |
220 | { |
221 | char *tail; |
222 | unsigned long long val; |
223 | size_t len; |
224 | |
225 | *res = 0; |
226 | len = strlen(cp); |
227 | if (len == 0) |
228 | return -EINVAL; |
229 | |
230 | val = simple_strtoull(cp, &tail, base); |
231 | if (tail == cp) |
232 | return -EINVAL; |
233 | if ((*tail == '\0') || |
234 | ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) { |
235 | *res = val; |
236 | return 0; |
237 | } |
238 | |
239 | return -EINVAL; |
240 | } |
241 | EXPORT_SYMBOL(strict_strtoull); |
242 | |
243 | /** |
244 | * strict_strtoll - convert a string to a long long strictly |
245 | * @cp: The string to be converted |
246 | * @base: The number base to use |
247 | * @res: The converted result value |
248 | * |
249 | * strict_strtoll is similiar to strict_strtoull, but it allows the first |
250 | * character of a string is '-'. |
251 | * |
252 | * It returns 0 if conversion is successful and *res is set to the converted |
253 | * value, otherwise it returns -EINVAL and *res is set to 0. |
254 | */ |
255 | int strict_strtoll(const char *cp, unsigned int base, long long *res) |
256 | { |
257 | int ret; |
258 | if (*cp == '-') { |
259 | ret = strict_strtoull(cp + 1, base, (unsigned long long *)res); |
260 | if (!ret) |
261 | *res = -(*res); |
262 | } else { |
263 | ret = strict_strtoull(cp, base, (unsigned long long *)res); |
264 | } |
265 | |
266 | return ret; |
267 | } |
268 | EXPORT_SYMBOL(strict_strtoll); |
269 | |
270 | static int skip_atoi(const char **s) |
271 | { |
272 | int i = 0; |
273 | |
274 | while (isdigit(**s)) |
275 | i = i*10 + *((*s)++) - '0'; |
276 | |
277 | return i; |
278 | } |
279 | |
280 | /* Decimal conversion is by far the most typical, and is used |
281 | * for /proc and /sys data. This directly impacts e.g. top performance |
282 | * with many processes running. We optimize it for speed |
283 | * using code from |
284 | * http://www.cs.uiowa.edu/~jones/bcd/decimal.html |
285 | * (with permission from the author, Douglas W. Jones). */ |
286 | |
287 | /* Formats correctly any integer in [0,99999]. |
288 | * Outputs from one to five digits depending on input. |
289 | * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */ |
290 | static char *put_dec_trunc(char *buf, unsigned q) |
291 | { |
292 | unsigned d3, d2, d1, d0; |
293 | d1 = (q>>4) & 0xf; |
294 | d2 = (q>>8) & 0xf; |
295 | d3 = (q>>12); |
296 | |
297 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); |
298 | q = (d0 * 0xcd) >> 11; |
299 | d0 = d0 - 10*q; |
300 | *buf++ = d0 + '0'; /* least significant digit */ |
301 | d1 = q + 9*d3 + 5*d2 + d1; |
302 | if (d1 != 0) { |
303 | q = (d1 * 0xcd) >> 11; |
304 | d1 = d1 - 10*q; |
305 | *buf++ = d1 + '0'; /* next digit */ |
306 | |
307 | d2 = q + 2*d2; |
308 | if ((d2 != 0) || (d3 != 0)) { |
309 | q = (d2 * 0xd) >> 7; |
310 | d2 = d2 - 10*q; |
311 | *buf++ = d2 + '0'; /* next digit */ |
312 | |
313 | d3 = q + 4*d3; |
314 | if (d3 != 0) { |
315 | q = (d3 * 0xcd) >> 11; |
316 | d3 = d3 - 10*q; |
317 | *buf++ = d3 + '0'; /* next digit */ |
318 | if (q != 0) |
319 | *buf++ = q + '0'; /* most sign. digit */ |
320 | } |
321 | } |
322 | } |
323 | |
324 | return buf; |
325 | } |
326 | /* Same with if's removed. Always emits five digits */ |
327 | static char *put_dec_full(char *buf, unsigned q) |
328 | { |
329 | /* BTW, if q is in [0,9999], 8-bit ints will be enough, */ |
330 | /* but anyway, gcc produces better code with full-sized ints */ |
331 | unsigned d3, d2, d1, d0; |
332 | d1 = (q>>4) & 0xf; |
333 | d2 = (q>>8) & 0xf; |
334 | d3 = (q>>12); |
335 | |
336 | /* |
337 | * Possible ways to approx. divide by 10 |
338 | * gcc -O2 replaces multiply with shifts and adds |
339 | * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386) |
340 | * (x * 0x67) >> 10: 1100111 |
341 | * (x * 0x34) >> 9: 110100 - same |
342 | * (x * 0x1a) >> 8: 11010 - same |
343 | * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386) |
344 | */ |
345 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); |
346 | q = (d0 * 0xcd) >> 11; |
347 | d0 = d0 - 10*q; |
348 | *buf++ = d0 + '0'; |
349 | d1 = q + 9*d3 + 5*d2 + d1; |
350 | q = (d1 * 0xcd) >> 11; |
351 | d1 = d1 - 10*q; |
352 | *buf++ = d1 + '0'; |
353 | |
354 | d2 = q + 2*d2; |
355 | q = (d2 * 0xd) >> 7; |
356 | d2 = d2 - 10*q; |
357 | *buf++ = d2 + '0'; |
358 | |
359 | d3 = q + 4*d3; |
360 | q = (d3 * 0xcd) >> 11; /* - shorter code */ |
361 | /* q = (d3 * 0x67) >> 10; - would also work */ |
362 | d3 = d3 - 10*q; |
363 | *buf++ = d3 + '0'; |
364 | *buf++ = q + '0'; |
365 | |
366 | return buf; |
367 | } |
368 | /* No inlining helps gcc to use registers better */ |
369 | static noinline char *put_dec(char *buf, unsigned long long num) |
370 | { |
371 | while (1) { |
372 | unsigned rem; |
373 | if (num < 100000) |
374 | return put_dec_trunc(buf, num); |
375 | rem = do_div(num, 100000); |
376 | buf = put_dec_full(buf, rem); |
377 | } |
378 | } |
379 | |
380 | #define ZEROPAD 1 /* pad with zero */ |
381 | #define SIGN 2 /* unsigned/signed long */ |
382 | #define PLUS 4 /* show plus */ |
383 | #define SPACE 8 /* space if plus */ |
384 | #define LEFT 16 /* left justified */ |
385 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ |
386 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ |
387 | |
388 | enum format_type { |
389 | FORMAT_TYPE_NONE, /* Just a string part */ |
390 | FORMAT_TYPE_WIDTH, |
391 | FORMAT_TYPE_PRECISION, |
392 | FORMAT_TYPE_CHAR, |
393 | FORMAT_TYPE_STR, |
394 | FORMAT_TYPE_PTR, |
395 | FORMAT_TYPE_PERCENT_CHAR, |
396 | FORMAT_TYPE_INVALID, |
397 | FORMAT_TYPE_LONG_LONG, |
398 | FORMAT_TYPE_ULONG, |
399 | FORMAT_TYPE_LONG, |
400 | FORMAT_TYPE_UBYTE, |
401 | FORMAT_TYPE_BYTE, |
402 | FORMAT_TYPE_USHORT, |
403 | FORMAT_TYPE_SHORT, |
404 | FORMAT_TYPE_UINT, |
405 | FORMAT_TYPE_INT, |
406 | FORMAT_TYPE_NRCHARS, |
407 | FORMAT_TYPE_SIZE_T, |
408 | FORMAT_TYPE_PTRDIFF |
409 | }; |
410 | |
411 | struct printf_spec { |
412 | u8 type; /* format_type enum */ |
413 | u8 flags; /* flags to number() */ |
414 | u8 base; /* number base, 8, 10 or 16 only */ |
415 | u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */ |
416 | s16 field_width; /* width of output field */ |
417 | s16 precision; /* # of digits/chars */ |
418 | }; |
419 | |
420 | static char *number(char *buf, char *end, unsigned long long num, |
421 | struct printf_spec spec) |
422 | { |
423 | /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ |
424 | static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ |
425 | |
426 | char tmp[66]; |
427 | char sign; |
428 | char locase; |
429 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
430 | int i; |
431 | |
432 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
433 | * produces same digits or (maybe lowercased) letters */ |
434 | locase = (spec.flags & SMALL); |
435 | if (spec.flags & LEFT) |
436 | spec.flags &= ~ZEROPAD; |
437 | sign = 0; |
438 | if (spec.flags & SIGN) { |
439 | if ((signed long long)num < 0) { |
440 | sign = '-'; |
441 | num = -(signed long long)num; |
442 | spec.field_width--; |
443 | } else if (spec.flags & PLUS) { |
444 | sign = '+'; |
445 | spec.field_width--; |
446 | } else if (spec.flags & SPACE) { |
447 | sign = ' '; |
448 | spec.field_width--; |
449 | } |
450 | } |
451 | if (need_pfx) { |
452 | spec.field_width--; |
453 | if (spec.base == 16) |
454 | spec.field_width--; |
455 | } |
456 | |
457 | /* generate full string in tmp[], in reverse order */ |
458 | i = 0; |
459 | if (num == 0) |
460 | tmp[i++] = '0'; |
461 | /* Generic code, for any base: |
462 | else do { |
463 | tmp[i++] = (digits[do_div(num,base)] | locase); |
464 | } while (num != 0); |
465 | */ |
466 | else if (spec.base != 10) { /* 8 or 16 */ |
467 | int mask = spec.base - 1; |
468 | int shift = 3; |
469 | |
470 | if (spec.base == 16) |
471 | shift = 4; |
472 | do { |
473 | tmp[i++] = (digits[((unsigned char)num) & mask] | locase); |
474 | num >>= shift; |
475 | } while (num); |
476 | } else { /* base 10 */ |
477 | i = put_dec(tmp, num) - tmp; |
478 | } |
479 | |
480 | /* printing 100 using %2d gives "100", not "00" */ |
481 | if (i > spec.precision) |
482 | spec.precision = i; |
483 | /* leading space padding */ |
484 | spec.field_width -= spec.precision; |
485 | if (!(spec.flags & (ZEROPAD+LEFT))) { |
486 | while (--spec.field_width >= 0) { |
487 | if (buf < end) |
488 | *buf = ' '; |
489 | ++buf; |
490 | } |
491 | } |
492 | /* sign */ |
493 | if (sign) { |
494 | if (buf < end) |
495 | *buf = sign; |
496 | ++buf; |
497 | } |
498 | /* "0x" / "0" prefix */ |
499 | if (need_pfx) { |
500 | if (buf < end) |
501 | *buf = '0'; |
502 | ++buf; |
503 | if (spec.base == 16) { |
504 | if (buf < end) |
505 | *buf = ('X' | locase); |
506 | ++buf; |
507 | } |
508 | } |
509 | /* zero or space padding */ |
510 | if (!(spec.flags & LEFT)) { |
511 | char c = (spec.flags & ZEROPAD) ? '0' : ' '; |
512 | while (--spec.field_width >= 0) { |
513 | if (buf < end) |
514 | *buf = c; |
515 | ++buf; |
516 | } |
517 | } |
518 | /* hmm even more zero padding? */ |
519 | while (i <= --spec.precision) { |
520 | if (buf < end) |
521 | *buf = '0'; |
522 | ++buf; |
523 | } |
524 | /* actual digits of result */ |
525 | while (--i >= 0) { |
526 | if (buf < end) |
527 | *buf = tmp[i]; |
528 | ++buf; |
529 | } |
530 | /* trailing space padding */ |
531 | while (--spec.field_width >= 0) { |
532 | if (buf < end) |
533 | *buf = ' '; |
534 | ++buf; |
535 | } |
536 | |
537 | return buf; |
538 | } |
539 | |
540 | static 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 char *symbol_string(char *buf, char *end, void *ptr, |
571 | struct printf_spec spec, char ext) |
572 | { |
573 | unsigned long value = (unsigned long) ptr; |
574 | #ifdef CONFIG_KALLSYMS |
575 | char sym[KSYM_SYMBOL_LEN]; |
576 | if (ext != 'f' && ext != 's') |
577 | sprint_symbol(sym, value); |
578 | else |
579 | kallsyms_lookup(value, NULL, NULL, NULL, sym); |
580 | |
581 | return string(buf, end, sym, spec); |
582 | #else |
583 | spec.field_width = 2 * sizeof(void *); |
584 | spec.flags |= SPECIAL | SMALL | ZEROPAD; |
585 | spec.base = 16; |
586 | |
587 | return number(buf, end, value, spec); |
588 | #endif |
589 | } |
590 | |
591 | static char *resource_string(char *buf, char *end, struct resource *res, |
592 | struct printf_spec spec, const char *fmt) |
593 | { |
594 | #ifndef IO_RSRC_PRINTK_SIZE |
595 | #define IO_RSRC_PRINTK_SIZE 6 |
596 | #endif |
597 | |
598 | #ifndef MEM_RSRC_PRINTK_SIZE |
599 | #define MEM_RSRC_PRINTK_SIZE 10 |
600 | #endif |
601 | static const struct printf_spec io_spec = { |
602 | .base = 16, |
603 | .field_width = IO_RSRC_PRINTK_SIZE, |
604 | .precision = -1, |
605 | .flags = SPECIAL | SMALL | ZEROPAD, |
606 | }; |
607 | static const struct printf_spec mem_spec = { |
608 | .base = 16, |
609 | .field_width = MEM_RSRC_PRINTK_SIZE, |
610 | .precision = -1, |
611 | .flags = SPECIAL | SMALL | ZEROPAD, |
612 | }; |
613 | static const struct printf_spec bus_spec = { |
614 | .base = 16, |
615 | .field_width = 2, |
616 | .precision = -1, |
617 | .flags = SMALL | ZEROPAD, |
618 | }; |
619 | static const struct printf_spec dec_spec = { |
620 | .base = 10, |
621 | .precision = -1, |
622 | .flags = 0, |
623 | }; |
624 | static const struct printf_spec str_spec = { |
625 | .field_width = -1, |
626 | .precision = 10, |
627 | .flags = LEFT, |
628 | }; |
629 | static const struct printf_spec flag_spec = { |
630 | .base = 16, |
631 | .precision = -1, |
632 | .flags = SPECIAL | SMALL, |
633 | }; |
634 | |
635 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) |
636 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ |
637 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) |
638 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) |
639 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") |
640 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") |
641 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, |
642 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; |
643 | |
644 | char *p = sym, *pend = sym + sizeof(sym); |
645 | int decode = (fmt[0] == 'R') ? 1 : 0; |
646 | const struct printf_spec *specp; |
647 | |
648 | *p++ = '['; |
649 | if (res->flags & IORESOURCE_IO) { |
650 | p = string(p, pend, "io ", str_spec); |
651 | specp = &io_spec; |
652 | } else if (res->flags & IORESOURCE_MEM) { |
653 | p = string(p, pend, "mem ", str_spec); |
654 | specp = &mem_spec; |
655 | } else if (res->flags & IORESOURCE_IRQ) { |
656 | p = string(p, pend, "irq ", str_spec); |
657 | specp = &dec_spec; |
658 | } else if (res->flags & IORESOURCE_DMA) { |
659 | p = string(p, pend, "dma ", str_spec); |
660 | specp = &dec_spec; |
661 | } else if (res->flags & IORESOURCE_BUS) { |
662 | p = string(p, pend, "bus ", str_spec); |
663 | specp = &bus_spec; |
664 | } else { |
665 | p = string(p, pend, "??? ", str_spec); |
666 | specp = &mem_spec; |
667 | decode = 0; |
668 | } |
669 | p = number(p, pend, res->start, *specp); |
670 | if (res->start != res->end) { |
671 | *p++ = '-'; |
672 | p = number(p, pend, res->end, *specp); |
673 | } |
674 | if (decode) { |
675 | if (res->flags & IORESOURCE_MEM_64) |
676 | p = string(p, pend, " 64bit", str_spec); |
677 | if (res->flags & IORESOURCE_PREFETCH) |
678 | p = string(p, pend, " pref", str_spec); |
679 | if (res->flags & IORESOURCE_WINDOW) |
680 | p = string(p, pend, " window", str_spec); |
681 | if (res->flags & IORESOURCE_DISABLED) |
682 | p = string(p, pend, " disabled", str_spec); |
683 | } else { |
684 | p = string(p, pend, " flags ", str_spec); |
685 | p = number(p, pend, res->flags, flag_spec); |
686 | } |
687 | *p++ = ']'; |
688 | *p = '\0'; |
689 | |
690 | return string(buf, end, sym, spec); |
691 | } |
692 | |
693 | static char *mac_address_string(char *buf, char *end, u8 *addr, |
694 | struct printf_spec spec, const char *fmt) |
695 | { |
696 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
697 | char *p = mac_addr; |
698 | int i; |
699 | char separator; |
700 | |
701 | if (fmt[1] == 'F') { /* FDDI canonical format */ |
702 | separator = '-'; |
703 | } else { |
704 | separator = ':'; |
705 | } |
706 | |
707 | for (i = 0; i < 6; i++) { |
708 | p = pack_hex_byte(p, addr[i]); |
709 | if (fmt[0] == 'M' && i != 5) |
710 | *p++ = separator; |
711 | } |
712 | *p = '\0'; |
713 | |
714 | return string(buf, end, mac_addr, spec); |
715 | } |
716 | |
717 | static char *ip4_string(char *p, const u8 *addr, const char *fmt) |
718 | { |
719 | int i; |
720 | bool leading_zeros = (fmt[0] == 'i'); |
721 | int index; |
722 | int step; |
723 | |
724 | switch (fmt[2]) { |
725 | case 'h': |
726 | #ifdef __BIG_ENDIAN |
727 | index = 0; |
728 | step = 1; |
729 | #else |
730 | index = 3; |
731 | step = -1; |
732 | #endif |
733 | break; |
734 | case 'l': |
735 | index = 3; |
736 | step = -1; |
737 | break; |
738 | case 'n': |
739 | case 'b': |
740 | default: |
741 | index = 0; |
742 | step = 1; |
743 | break; |
744 | } |
745 | for (i = 0; i < 4; i++) { |
746 | char temp[3]; /* hold each IP quad in reverse order */ |
747 | int digits = put_dec_trunc(temp, addr[index]) - temp; |
748 | if (leading_zeros) { |
749 | if (digits < 3) |
750 | *p++ = '0'; |
751 | if (digits < 2) |
752 | *p++ = '0'; |
753 | } |
754 | /* reverse the digits in the quad */ |
755 | while (digits--) |
756 | *p++ = temp[digits]; |
757 | if (i < 3) |
758 | *p++ = '.'; |
759 | index += step; |
760 | } |
761 | *p = '\0'; |
762 | |
763 | return p; |
764 | } |
765 | |
766 | static char *ip6_compressed_string(char *p, const char *addr) |
767 | { |
768 | int i, j, range; |
769 | unsigned char zerolength[8]; |
770 | int longest = 1; |
771 | int colonpos = -1; |
772 | u16 word; |
773 | u8 hi, lo; |
774 | bool needcolon = false; |
775 | bool useIPv4; |
776 | struct in6_addr in6; |
777 | |
778 | memcpy(&in6, addr, sizeof(struct in6_addr)); |
779 | |
780 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); |
781 | |
782 | memset(zerolength, 0, sizeof(zerolength)); |
783 | |
784 | if (useIPv4) |
785 | range = 6; |
786 | else |
787 | range = 8; |
788 | |
789 | /* find position of longest 0 run */ |
790 | for (i = 0; i < range; i++) { |
791 | for (j = i; j < range; j++) { |
792 | if (in6.s6_addr16[j] != 0) |
793 | break; |
794 | zerolength[i]++; |
795 | } |
796 | } |
797 | for (i = 0; i < range; i++) { |
798 | if (zerolength[i] > longest) { |
799 | longest = zerolength[i]; |
800 | colonpos = i; |
801 | } |
802 | } |
803 | |
804 | /* emit address */ |
805 | for (i = 0; i < range; i++) { |
806 | if (i == colonpos) { |
807 | if (needcolon || i == 0) |
808 | *p++ = ':'; |
809 | *p++ = ':'; |
810 | needcolon = false; |
811 | i += longest - 1; |
812 | continue; |
813 | } |
814 | if (needcolon) { |
815 | *p++ = ':'; |
816 | needcolon = false; |
817 | } |
818 | /* hex u16 without leading 0s */ |
819 | word = ntohs(in6.s6_addr16[i]); |
820 | hi = word >> 8; |
821 | lo = word & 0xff; |
822 | if (hi) { |
823 | if (hi > 0x0f) |
824 | p = pack_hex_byte(p, hi); |
825 | else |
826 | *p++ = hex_asc_lo(hi); |
827 | p = pack_hex_byte(p, lo); |
828 | } |
829 | else if (lo > 0x0f) |
830 | p = pack_hex_byte(p, lo); |
831 | else |
832 | *p++ = hex_asc_lo(lo); |
833 | needcolon = true; |
834 | } |
835 | |
836 | if (useIPv4) { |
837 | if (needcolon) |
838 | *p++ = ':'; |
839 | p = ip4_string(p, &in6.s6_addr[12], "I4"); |
840 | } |
841 | *p = '\0'; |
842 | |
843 | return p; |
844 | } |
845 | |
846 | static char *ip6_string(char *p, const char *addr, const char *fmt) |
847 | { |
848 | int i; |
849 | |
850 | for (i = 0; i < 8; i++) { |
851 | p = pack_hex_byte(p, *addr++); |
852 | p = pack_hex_byte(p, *addr++); |
853 | if (fmt[0] == 'I' && i != 7) |
854 | *p++ = ':'; |
855 | } |
856 | *p = '\0'; |
857 | |
858 | return p; |
859 | } |
860 | |
861 | static char *ip6_addr_string(char *buf, char *end, const u8 *addr, |
862 | struct printf_spec spec, const char *fmt) |
863 | { |
864 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; |
865 | |
866 | if (fmt[0] == 'I' && fmt[2] == 'c') |
867 | ip6_compressed_string(ip6_addr, addr); |
868 | else |
869 | ip6_string(ip6_addr, addr, fmt); |
870 | |
871 | return string(buf, end, ip6_addr, spec); |
872 | } |
873 | |
874 | static char *ip4_addr_string(char *buf, char *end, const u8 *addr, |
875 | struct printf_spec spec, const char *fmt) |
876 | { |
877 | char ip4_addr[sizeof("255.255.255.255")]; |
878 | |
879 | ip4_string(ip4_addr, addr, fmt); |
880 | |
881 | return string(buf, end, ip4_addr, spec); |
882 | } |
883 | |
884 | static char *uuid_string(char *buf, char *end, const u8 *addr, |
885 | struct printf_spec spec, const char *fmt) |
886 | { |
887 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; |
888 | char *p = uuid; |
889 | int i; |
890 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; |
891 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; |
892 | const u8 *index = be; |
893 | bool uc = false; |
894 | |
895 | switch (*(++fmt)) { |
896 | case 'L': |
897 | uc = true; /* fall-through */ |
898 | case 'l': |
899 | index = le; |
900 | break; |
901 | case 'B': |
902 | uc = true; |
903 | break; |
904 | } |
905 | |
906 | for (i = 0; i < 16; i++) { |
907 | p = pack_hex_byte(p, addr[index[i]]); |
908 | switch (i) { |
909 | case 3: |
910 | case 5: |
911 | case 7: |
912 | case 9: |
913 | *p++ = '-'; |
914 | break; |
915 | } |
916 | } |
917 | |
918 | *p = 0; |
919 | |
920 | if (uc) { |
921 | p = uuid; |
922 | do { |
923 | *p = toupper(*p); |
924 | } while (*(++p)); |
925 | } |
926 | |
927 | return string(buf, end, uuid, spec); |
928 | } |
929 | |
930 | /* |
931 | * Show a '%p' thing. A kernel extension is that the '%p' is followed |
932 | * by an extra set of alphanumeric characters that are extended format |
933 | * specifiers. |
934 | * |
935 | * Right now we handle: |
936 | * |
937 | * - 'F' For symbolic function descriptor pointers with offset |
938 | * - 'f' For simple symbolic function names without offset |
939 | * - 'S' For symbolic direct pointers with offset |
940 | * - 's' For symbolic direct pointers without offset |
941 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] |
942 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] |
943 | * - 'M' For a 6-byte MAC address, it prints the address in the |
944 | * usual colon-separated hex notation |
945 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
946 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address |
947 | * with a dash-separated hex notation |
948 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way |
949 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) |
950 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's |
951 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses |
952 | * IPv6 omits the colons (01020304...0f) |
953 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) |
954 | * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order |
955 | * - 'I6c' for IPv6 addresses printed as specified by |
956 | * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00 |
957 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form |
958 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" |
959 | * Options for %pU are: |
960 | * b big endian lower case hex (default) |
961 | * B big endian UPPER case hex |
962 | * l little endian lower case hex |
963 | * L little endian UPPER case hex |
964 | * big endian output byte order is: |
965 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] |
966 | * little endian output byte order is: |
967 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] |
968 | * |
969 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 |
970 | * function pointers are really function descriptors, which contain a |
971 | * pointer to the real address. |
972 | */ |
973 | static char *pointer(const char *fmt, char *buf, char *end, void *ptr, |
974 | struct printf_spec spec) |
975 | { |
976 | if (!ptr) |
977 | return string(buf, end, "(null)", spec); |
978 | |
979 | switch (*fmt) { |
980 | case 'F': |
981 | case 'f': |
982 | ptr = dereference_function_descriptor(ptr); |
983 | /* Fallthrough */ |
984 | case 'S': |
985 | case 's': |
986 | return symbol_string(buf, end, ptr, spec, *fmt); |
987 | case 'R': |
988 | case 'r': |
989 | return resource_string(buf, end, ptr, spec, fmt); |
990 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
991 | case 'm': /* Contiguous: 000102030405 */ |
992 | /* [mM]F (FDDI, bit reversed) */ |
993 | return mac_address_string(buf, end, ptr, spec, fmt); |
994 | case 'I': /* Formatted IP supported |
995 | * 4: 1.2.3.4 |
996 | * 6: 0001:0203:...:0708 |
997 | * 6c: 1::708 or 1::1.2.3.4 |
998 | */ |
999 | case 'i': /* Contiguous: |
1000 | * 4: 001.002.003.004 |
1001 | * 6: 000102...0f |
1002 | */ |
1003 | switch (fmt[1]) { |
1004 | case '6': |
1005 | return ip6_addr_string(buf, end, ptr, spec, fmt); |
1006 | case '4': |
1007 | return ip4_addr_string(buf, end, ptr, spec, fmt); |
1008 | } |
1009 | break; |
1010 | case 'U': |
1011 | return uuid_string(buf, end, ptr, spec, fmt); |
1012 | } |
1013 | spec.flags |= SMALL; |
1014 | if (spec.field_width == -1) { |
1015 | spec.field_width = 2*sizeof(void *); |
1016 | spec.flags |= ZEROPAD; |
1017 | } |
1018 | spec.base = 16; |
1019 | |
1020 | return number(buf, end, (unsigned long) ptr, spec); |
1021 | } |
1022 | |
1023 | /* |
1024 | * Helper function to decode printf style format. |
1025 | * Each call decode a token from the format and return the |
1026 | * number of characters read (or likely the delta where it wants |
1027 | * to go on the next call). |
1028 | * The decoded token is returned through the parameters |
1029 | * |
1030 | * 'h', 'l', or 'L' for integer fields |
1031 | * 'z' support added 23/7/1999 S.H. |
1032 | * 'z' changed to 'Z' --davidm 1/25/99 |
1033 | * 't' added for ptrdiff_t |
1034 | * |
1035 | * @fmt: the format string |
1036 | * @type of the token returned |
1037 | * @flags: various flags such as +, -, # tokens.. |
1038 | * @field_width: overwritten width |
1039 | * @base: base of the number (octal, hex, ...) |
1040 | * @precision: precision of a number |
1041 | * @qualifier: qualifier of a number (long, size_t, ...) |
1042 | */ |
1043 | static int format_decode(const char *fmt, struct printf_spec *spec) |
1044 | { |
1045 | const char *start = fmt; |
1046 | |
1047 | /* we finished early by reading the field width */ |
1048 | if (spec->type == FORMAT_TYPE_WIDTH) { |
1049 | if (spec->field_width < 0) { |
1050 | spec->field_width = -spec->field_width; |
1051 | spec->flags |= LEFT; |
1052 | } |
1053 | spec->type = FORMAT_TYPE_NONE; |
1054 | goto precision; |
1055 | } |
1056 | |
1057 | /* we finished early by reading the precision */ |
1058 | if (spec->type == FORMAT_TYPE_PRECISION) { |
1059 | if (spec->precision < 0) |
1060 | spec->precision = 0; |
1061 | |
1062 | spec->type = FORMAT_TYPE_NONE; |
1063 | goto qualifier; |
1064 | } |
1065 | |
1066 | /* By default */ |
1067 | spec->type = FORMAT_TYPE_NONE; |
1068 | |
1069 | for (; *fmt ; ++fmt) { |
1070 | if (*fmt == '%') |
1071 | break; |
1072 | } |
1073 | |
1074 | /* Return the current non-format string */ |
1075 | if (fmt != start || !*fmt) |
1076 | return fmt - start; |
1077 | |
1078 | /* Process flags */ |
1079 | spec->flags = 0; |
1080 | |
1081 | while (1) { /* this also skips first '%' */ |
1082 | bool found = true; |
1083 | |
1084 | ++fmt; |
1085 | |
1086 | switch (*fmt) { |
1087 | case '-': spec->flags |= LEFT; break; |
1088 | case '+': spec->flags |= PLUS; break; |
1089 | case ' ': spec->flags |= SPACE; break; |
1090 | case '#': spec->flags |= SPECIAL; break; |
1091 | case '0': spec->flags |= ZEROPAD; break; |
1092 | default: found = false; |
1093 | } |
1094 | |
1095 | if (!found) |
1096 | break; |
1097 | } |
1098 | |
1099 | /* get field width */ |
1100 | spec->field_width = -1; |
1101 | |
1102 | if (isdigit(*fmt)) |
1103 | spec->field_width = skip_atoi(&fmt); |
1104 | else if (*fmt == '*') { |
1105 | /* it's the next argument */ |
1106 | spec->type = FORMAT_TYPE_WIDTH; |
1107 | return ++fmt - start; |
1108 | } |
1109 | |
1110 | precision: |
1111 | /* get the precision */ |
1112 | spec->precision = -1; |
1113 | if (*fmt == '.') { |
1114 | ++fmt; |
1115 | if (isdigit(*fmt)) { |
1116 | spec->precision = skip_atoi(&fmt); |
1117 | if (spec->precision < 0) |
1118 | spec->precision = 0; |
1119 | } else if (*fmt == '*') { |
1120 | /* it's the next argument */ |
1121 | spec->type = FORMAT_TYPE_PRECISION; |
1122 | return ++fmt - start; |
1123 | } |
1124 | } |
1125 | |
1126 | qualifier: |
1127 | /* get the conversion qualifier */ |
1128 | spec->qualifier = -1; |
1129 | if (*fmt == 'h' || TOLOWER(*fmt) == 'l' || |
1130 | TOLOWER(*fmt) == 'z' || *fmt == 't') { |
1131 | spec->qualifier = *fmt++; |
1132 | if (unlikely(spec->qualifier == *fmt)) { |
1133 | if (spec->qualifier == 'l') { |
1134 | spec->qualifier = 'L'; |
1135 | ++fmt; |
1136 | } else if (spec->qualifier == 'h') { |
1137 | spec->qualifier = 'H'; |
1138 | ++fmt; |
1139 | } |
1140 | } |
1141 | } |
1142 | |
1143 | /* default base */ |
1144 | spec->base = 10; |
1145 | switch (*fmt) { |
1146 | case 'c': |
1147 | spec->type = FORMAT_TYPE_CHAR; |
1148 | return ++fmt - start; |
1149 | |
1150 | case 's': |
1151 | spec->type = FORMAT_TYPE_STR; |
1152 | return ++fmt - start; |
1153 | |
1154 | case 'p': |
1155 | spec->type = FORMAT_TYPE_PTR; |
1156 | return fmt - start; |
1157 | /* skip alnum */ |
1158 | |
1159 | case 'n': |
1160 | spec->type = FORMAT_TYPE_NRCHARS; |
1161 | return ++fmt - start; |
1162 | |
1163 | case '%': |
1164 | spec->type = FORMAT_TYPE_PERCENT_CHAR; |
1165 | return ++fmt - start; |
1166 | |
1167 | /* integer number formats - set up the flags and "break" */ |
1168 | case 'o': |
1169 | spec->base = 8; |
1170 | break; |
1171 | |
1172 | case 'x': |
1173 | spec->flags |= SMALL; |
1174 | |
1175 | case 'X': |
1176 | spec->base = 16; |
1177 | break; |
1178 | |
1179 | case 'd': |
1180 | case 'i': |
1181 | spec->flags |= SIGN; |
1182 | case 'u': |
1183 | break; |
1184 | |
1185 | default: |
1186 | spec->type = FORMAT_TYPE_INVALID; |
1187 | return fmt - start; |
1188 | } |
1189 | |
1190 | if (spec->qualifier == 'L') |
1191 | spec->type = FORMAT_TYPE_LONG_LONG; |
1192 | else if (spec->qualifier == 'l') { |
1193 | if (spec->flags & SIGN) |
1194 | spec->type = FORMAT_TYPE_LONG; |
1195 | else |
1196 | spec->type = FORMAT_TYPE_ULONG; |
1197 | } else if (TOLOWER(spec->qualifier) == 'z') { |
1198 | spec->type = FORMAT_TYPE_SIZE_T; |
1199 | } else if (spec->qualifier == 't') { |
1200 | spec->type = FORMAT_TYPE_PTRDIFF; |
1201 | } else if (spec->qualifier == 'H') { |
1202 | if (spec->flags & SIGN) |
1203 | spec->type = FORMAT_TYPE_BYTE; |
1204 | else |
1205 | spec->type = FORMAT_TYPE_UBYTE; |
1206 | } else if (spec->qualifier == 'h') { |
1207 | if (spec->flags & SIGN) |
1208 | spec->type = FORMAT_TYPE_SHORT; |
1209 | else |
1210 | spec->type = FORMAT_TYPE_USHORT; |
1211 | } else { |
1212 | if (spec->flags & SIGN) |
1213 | spec->type = FORMAT_TYPE_INT; |
1214 | else |
1215 | spec->type = FORMAT_TYPE_UINT; |
1216 | } |
1217 | |
1218 | return ++fmt - start; |
1219 | } |
1220 | |
1221 | /** |
1222 | * vsnprintf - Format a string and place it in a buffer |
1223 | * @buf: The buffer to place the result into |
1224 | * @size: The size of the buffer, including the trailing null space |
1225 | * @fmt: The format string to use |
1226 | * @args: Arguments for the format string |
1227 | * |
1228 | * This function follows C99 vsnprintf, but has some extensions: |
1229 | * %pS output the name of a text symbol with offset |
1230 | * %ps output the name of a text symbol without offset |
1231 | * %pF output the name of a function pointer with its offset |
1232 | * %pf output the name of a function pointer without its offset |
1233 | * %pR output the address range in a struct resource with decoded flags |
1234 | * %pr output the address range in a struct resource with raw flags |
1235 | * %pM output a 6-byte MAC address with colons |
1236 | * %pm output a 6-byte MAC address without colons |
1237 | * %pI4 print an IPv4 address without leading zeros |
1238 | * %pi4 print an IPv4 address with leading zeros |
1239 | * %pI6 print an IPv6 address with colons |
1240 | * %pi6 print an IPv6 address without colons |
1241 | * %pI6c print an IPv6 address as specified by |
1242 | * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00 |
1243 | * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper |
1244 | * case. |
1245 | * %n is ignored |
1246 | * |
1247 | * The return value is the number of characters which would |
1248 | * be generated for the given input, excluding the trailing |
1249 | * '\0', as per ISO C99. If you want to have the exact |
1250 | * number of characters written into @buf as return value |
1251 | * (not including the trailing '\0'), use vscnprintf(). If the |
1252 | * return is greater than or equal to @size, the resulting |
1253 | * string is truncated. |
1254 | * |
1255 | * Call this function if you are already dealing with a va_list. |
1256 | * You probably want snprintf() instead. |
1257 | */ |
1258 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) |
1259 | { |
1260 | unsigned long long num; |
1261 | char *str, *end; |
1262 | struct printf_spec spec = {0}; |
1263 | |
1264 | /* Reject out-of-range values early. Large positive sizes are |
1265 | used for unknown buffer sizes. */ |
1266 | if (WARN_ON_ONCE((int) size < 0)) |
1267 | return 0; |
1268 | |
1269 | str = buf; |
1270 | end = buf + size; |
1271 | |
1272 | /* Make sure end is always >= buf */ |
1273 | if (end < buf) { |
1274 | end = ((void *)-1); |
1275 | size = end - buf; |
1276 | } |
1277 | |
1278 | while (*fmt) { |
1279 | const char *old_fmt = fmt; |
1280 | int read = format_decode(fmt, &spec); |
1281 | |
1282 | fmt += read; |
1283 | |
1284 | switch (spec.type) { |
1285 | case FORMAT_TYPE_NONE: { |
1286 | int copy = read; |
1287 | if (str < end) { |
1288 | if (copy > end - str) |
1289 | copy = end - str; |
1290 | memcpy(str, old_fmt, copy); |
1291 | } |
1292 | str += read; |
1293 | break; |
1294 | } |
1295 | |
1296 | case FORMAT_TYPE_WIDTH: |
1297 | spec.field_width = va_arg(args, int); |
1298 | break; |
1299 | |
1300 | case FORMAT_TYPE_PRECISION: |
1301 | spec.precision = va_arg(args, int); |
1302 | break; |
1303 | |
1304 | case FORMAT_TYPE_CHAR: { |
1305 | char c; |
1306 | |
1307 | if (!(spec.flags & LEFT)) { |
1308 | while (--spec.field_width > 0) { |
1309 | if (str < end) |
1310 | *str = ' '; |
1311 | ++str; |
1312 | |
1313 | } |
1314 | } |
1315 | c = (unsigned char) va_arg(args, int); |
1316 | if (str < end) |
1317 | *str = c; |
1318 | ++str; |
1319 | while (--spec.field_width > 0) { |
1320 | if (str < end) |
1321 | *str = ' '; |
1322 | ++str; |
1323 | } |
1324 | break; |
1325 | } |
1326 | |
1327 | case FORMAT_TYPE_STR: |
1328 | str = string(str, end, va_arg(args, char *), spec); |
1329 | break; |
1330 | |
1331 | case FORMAT_TYPE_PTR: |
1332 | str = pointer(fmt+1, str, end, va_arg(args, void *), |
1333 | spec); |
1334 | while (isalnum(*fmt)) |
1335 | fmt++; |
1336 | break; |
1337 | |
1338 | case FORMAT_TYPE_PERCENT_CHAR: |
1339 | if (str < end) |
1340 | *str = '%'; |
1341 | ++str; |
1342 | break; |
1343 | |
1344 | case FORMAT_TYPE_INVALID: |
1345 | if (str < end) |
1346 | *str = '%'; |
1347 | ++str; |
1348 | break; |
1349 | |
1350 | case FORMAT_TYPE_NRCHARS: { |
1351 | u8 qualifier = spec.qualifier; |
1352 | |
1353 | if (qualifier == 'l') { |
1354 | long *ip = va_arg(args, long *); |
1355 | *ip = (str - buf); |
1356 | } else if (TOLOWER(qualifier) == 'z') { |
1357 | size_t *ip = va_arg(args, size_t *); |
1358 | *ip = (str - buf); |
1359 | } else { |
1360 | int *ip = va_arg(args, int *); |
1361 | *ip = (str - buf); |
1362 | } |
1363 | break; |
1364 | } |
1365 | |
1366 | default: |
1367 | switch (spec.type) { |
1368 | case FORMAT_TYPE_LONG_LONG: |
1369 | num = va_arg(args, long long); |
1370 | break; |
1371 | case FORMAT_TYPE_ULONG: |
1372 | num = va_arg(args, unsigned long); |
1373 | break; |
1374 | case FORMAT_TYPE_LONG: |
1375 | num = va_arg(args, long); |
1376 | break; |
1377 | case FORMAT_TYPE_SIZE_T: |
1378 | num = va_arg(args, size_t); |
1379 | break; |
1380 | case FORMAT_TYPE_PTRDIFF: |
1381 | num = va_arg(args, ptrdiff_t); |
1382 | break; |
1383 | case FORMAT_TYPE_UBYTE: |
1384 | num = (unsigned char) va_arg(args, int); |
1385 | break; |
1386 | case FORMAT_TYPE_BYTE: |
1387 | num = (signed char) va_arg(args, int); |
1388 | break; |
1389 | case FORMAT_TYPE_USHORT: |
1390 | num = (unsigned short) va_arg(args, int); |
1391 | break; |
1392 | case FORMAT_TYPE_SHORT: |
1393 | num = (short) va_arg(args, int); |
1394 | break; |
1395 | case FORMAT_TYPE_INT: |
1396 | num = (int) va_arg(args, int); |
1397 | break; |
1398 | default: |
1399 | num = va_arg(args, unsigned int); |
1400 | } |
1401 | |
1402 | str = number(str, end, num, spec); |
1403 | } |
1404 | } |
1405 | |
1406 | if (size > 0) { |
1407 | if (str < end) |
1408 | *str = '\0'; |
1409 | else |
1410 | end[-1] = '\0'; |
1411 | } |
1412 | |
1413 | /* the trailing null byte doesn't count towards the total */ |
1414 | return str-buf; |
1415 | |
1416 | } |
1417 | EXPORT_SYMBOL(vsnprintf); |
1418 | |
1419 | /** |
1420 | * vscnprintf - Format a string and place it in a buffer |
1421 | * @buf: The buffer to place the result into |
1422 | * @size: The size of the buffer, including the trailing null space |
1423 | * @fmt: The format string to use |
1424 | * @args: Arguments for the format string |
1425 | * |
1426 | * The return value is the number of characters which have been written into |
1427 | * the @buf not including the trailing '\0'. If @size is <= 0 the function |
1428 | * returns 0. |
1429 | * |
1430 | * Call this function if you are already dealing with a va_list. |
1431 | * You probably want scnprintf() instead. |
1432 | * |
1433 | * See the vsnprintf() documentation for format string extensions over C99. |
1434 | */ |
1435 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) |
1436 | { |
1437 | int i; |
1438 | |
1439 | i = vsnprintf(buf, size, fmt, args); |
1440 | |
1441 | return (i >= size) ? (size - 1) : i; |
1442 | } |
1443 | EXPORT_SYMBOL(vscnprintf); |
1444 | |
1445 | /** |
1446 | * snprintf - Format a string and place it in a buffer |
1447 | * @buf: The buffer to place the result into |
1448 | * @size: The size of the buffer, including the trailing null space |
1449 | * @fmt: The format string to use |
1450 | * @...: Arguments for the format string |
1451 | * |
1452 | * The return value is the number of characters which would be |
1453 | * generated for the given input, excluding the trailing null, |
1454 | * as per ISO C99. If the return is greater than or equal to |
1455 | * @size, the resulting string is truncated. |
1456 | * |
1457 | * See the vsnprintf() documentation for format string extensions over C99. |
1458 | */ |
1459 | int snprintf(char *buf, size_t size, const char *fmt, ...) |
1460 | { |
1461 | va_list args; |
1462 | int i; |
1463 | |
1464 | va_start(args, fmt); |
1465 | i = vsnprintf(buf, size, fmt, args); |
1466 | va_end(args); |
1467 | |
1468 | return i; |
1469 | } |
1470 | EXPORT_SYMBOL(snprintf); |
1471 | |
1472 | /** |
1473 | * scnprintf - 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 written into @buf not including |
1480 | * the trailing '\0'. If @size is <= 0 the function returns 0. |
1481 | */ |
1482 | |
1483 | int scnprintf(char *buf, size_t size, const char *fmt, ...) |
1484 | { |
1485 | va_list args; |
1486 | int i; |
1487 | |
1488 | va_start(args, fmt); |
1489 | i = vsnprintf(buf, size, fmt, args); |
1490 | va_end(args); |
1491 | |
1492 | return (i >= size) ? (size - 1) : i; |
1493 | } |
1494 | EXPORT_SYMBOL(scnprintf); |
1495 | |
1496 | /** |
1497 | * vsprintf - Format a string and place it in a buffer |
1498 | * @buf: The buffer to place the result into |
1499 | * @fmt: The format string to use |
1500 | * @args: Arguments for the format string |
1501 | * |
1502 | * The function returns the number of characters written |
1503 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1504 | * buffer overflows. |
1505 | * |
1506 | * Call this function if you are already dealing with a va_list. |
1507 | * You probably want sprintf() instead. |
1508 | * |
1509 | * See the vsnprintf() documentation for format string extensions over C99. |
1510 | */ |
1511 | int vsprintf(char *buf, const char *fmt, va_list args) |
1512 | { |
1513 | return vsnprintf(buf, INT_MAX, fmt, args); |
1514 | } |
1515 | EXPORT_SYMBOL(vsprintf); |
1516 | |
1517 | /** |
1518 | * sprintf - Format a string and place it in a buffer |
1519 | * @buf: The buffer to place the result into |
1520 | * @fmt: The format string to use |
1521 | * @...: Arguments for the format string |
1522 | * |
1523 | * The function returns the number of characters written |
1524 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1525 | * buffer overflows. |
1526 | * |
1527 | * See the vsnprintf() documentation for format string extensions over C99. |
1528 | */ |
1529 | int sprintf(char *buf, const char *fmt, ...) |
1530 | { |
1531 | va_list args; |
1532 | int i; |
1533 | |
1534 | va_start(args, fmt); |
1535 | i = vsnprintf(buf, INT_MAX, fmt, args); |
1536 | va_end(args); |
1537 | |
1538 | return i; |
1539 | } |
1540 | EXPORT_SYMBOL(sprintf); |
1541 | |
1542 | #ifdef CONFIG_BINARY_PRINTF |
1543 | /* |
1544 | * bprintf service: |
1545 | * vbin_printf() - VA arguments to binary data |
1546 | * bstr_printf() - Binary data to text string |
1547 | */ |
1548 | |
1549 | /** |
1550 | * vbin_printf - Parse a format string and place args' binary value in a buffer |
1551 | * @bin_buf: The buffer to place args' binary value |
1552 | * @size: The size of the buffer(by words(32bits), not characters) |
1553 | * @fmt: The format string to use |
1554 | * @args: Arguments for the format string |
1555 | * |
1556 | * The format follows C99 vsnprintf, except %n is ignored, and its argument |
1557 | * is skiped. |
1558 | * |
1559 | * The return value is the number of words(32bits) which would be generated for |
1560 | * the given input. |
1561 | * |
1562 | * NOTE: |
1563 | * If the return value is greater than @size, the resulting bin_buf is NOT |
1564 | * valid for bstr_printf(). |
1565 | */ |
1566 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) |
1567 | { |
1568 | struct printf_spec spec = {0}; |
1569 | char *str, *end; |
1570 | |
1571 | str = (char *)bin_buf; |
1572 | end = (char *)(bin_buf + size); |
1573 | |
1574 | #define save_arg(type) \ |
1575 | do { \ |
1576 | if (sizeof(type) == 8) { \ |
1577 | unsigned long long value; \ |
1578 | str = PTR_ALIGN(str, sizeof(u32)); \ |
1579 | value = va_arg(args, unsigned long long); \ |
1580 | if (str + sizeof(type) <= end) { \ |
1581 | *(u32 *)str = *(u32 *)&value; \ |
1582 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ |
1583 | } \ |
1584 | } else { \ |
1585 | unsigned long value; \ |
1586 | str = PTR_ALIGN(str, sizeof(type)); \ |
1587 | value = va_arg(args, int); \ |
1588 | if (str + sizeof(type) <= end) \ |
1589 | *(typeof(type) *)str = (type)value; \ |
1590 | } \ |
1591 | str += sizeof(type); \ |
1592 | } while (0) |
1593 | |
1594 | while (*fmt) { |
1595 | int read = format_decode(fmt, &spec); |
1596 | |
1597 | fmt += read; |
1598 | |
1599 | switch (spec.type) { |
1600 | case FORMAT_TYPE_NONE: |
1601 | case FORMAT_TYPE_INVALID: |
1602 | case FORMAT_TYPE_PERCENT_CHAR: |
1603 | break; |
1604 | |
1605 | case FORMAT_TYPE_WIDTH: |
1606 | case FORMAT_TYPE_PRECISION: |
1607 | save_arg(int); |
1608 | break; |
1609 | |
1610 | case FORMAT_TYPE_CHAR: |
1611 | save_arg(char); |
1612 | break; |
1613 | |
1614 | case FORMAT_TYPE_STR: { |
1615 | const char *save_str = va_arg(args, char *); |
1616 | size_t len; |
1617 | |
1618 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE |
1619 | || (unsigned long)save_str < PAGE_SIZE) |
1620 | save_str = "(null)"; |
1621 | len = strlen(save_str) + 1; |
1622 | if (str + len < end) |
1623 | memcpy(str, save_str, len); |
1624 | str += len; |
1625 | break; |
1626 | } |
1627 | |
1628 | case FORMAT_TYPE_PTR: |
1629 | save_arg(void *); |
1630 | /* skip all alphanumeric pointer suffixes */ |
1631 | while (isalnum(*fmt)) |
1632 | fmt++; |
1633 | break; |
1634 | |
1635 | case FORMAT_TYPE_NRCHARS: { |
1636 | /* skip %n 's argument */ |
1637 | u8 qualifier = spec.qualifier; |
1638 | void *skip_arg; |
1639 | if (qualifier == 'l') |
1640 | skip_arg = va_arg(args, long *); |
1641 | else if (TOLOWER(qualifier) == 'z') |
1642 | skip_arg = va_arg(args, size_t *); |
1643 | else |
1644 | skip_arg = va_arg(args, int *); |
1645 | break; |
1646 | } |
1647 | |
1648 | default: |
1649 | switch (spec.type) { |
1650 | |
1651 | case FORMAT_TYPE_LONG_LONG: |
1652 | save_arg(long long); |
1653 | break; |
1654 | case FORMAT_TYPE_ULONG: |
1655 | case FORMAT_TYPE_LONG: |
1656 | save_arg(unsigned long); |
1657 | break; |
1658 | case FORMAT_TYPE_SIZE_T: |
1659 | save_arg(size_t); |
1660 | break; |
1661 | case FORMAT_TYPE_PTRDIFF: |
1662 | save_arg(ptrdiff_t); |
1663 | break; |
1664 | case FORMAT_TYPE_UBYTE: |
1665 | case FORMAT_TYPE_BYTE: |
1666 | save_arg(char); |
1667 | break; |
1668 | case FORMAT_TYPE_USHORT: |
1669 | case FORMAT_TYPE_SHORT: |
1670 | save_arg(short); |
1671 | break; |
1672 | default: |
1673 | save_arg(int); |
1674 | } |
1675 | } |
1676 | } |
1677 | |
1678 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
1679 | #undef save_arg |
1680 | } |
1681 | EXPORT_SYMBOL_GPL(vbin_printf); |
1682 | |
1683 | /** |
1684 | * bstr_printf - Format a string from binary arguments and place it in a buffer |
1685 | * @buf: The buffer to place the result into |
1686 | * @size: The size of the buffer, including the trailing null space |
1687 | * @fmt: The format string to use |
1688 | * @bin_buf: Binary arguments for the format string |
1689 | * |
1690 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets |
1691 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is |
1692 | * a binary buffer that generated by vbin_printf. |
1693 | * |
1694 | * The format follows C99 vsnprintf, but has some extensions: |
1695 | * see vsnprintf comment for details. |
1696 | * |
1697 | * The return value is the number of characters which would |
1698 | * be generated for the given input, excluding the trailing |
1699 | * '\0', as per ISO C99. If you want to have the exact |
1700 | * number of characters written into @buf as return value |
1701 | * (not including the trailing '\0'), use vscnprintf(). If the |
1702 | * return is greater than or equal to @size, the resulting |
1703 | * string is truncated. |
1704 | */ |
1705 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) |
1706 | { |
1707 | struct printf_spec spec = {0}; |
1708 | char *str, *end; |
1709 | const char *args = (const char *)bin_buf; |
1710 | |
1711 | if (WARN_ON_ONCE((int) size < 0)) |
1712 | return 0; |
1713 | |
1714 | str = buf; |
1715 | end = buf + size; |
1716 | |
1717 | #define get_arg(type) \ |
1718 | ({ \ |
1719 | typeof(type) value; \ |
1720 | if (sizeof(type) == 8) { \ |
1721 | args = PTR_ALIGN(args, sizeof(u32)); \ |
1722 | *(u32 *)&value = *(u32 *)args; \ |
1723 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ |
1724 | } else { \ |
1725 | args = PTR_ALIGN(args, sizeof(type)); \ |
1726 | value = *(typeof(type) *)args; \ |
1727 | } \ |
1728 | args += sizeof(type); \ |
1729 | value; \ |
1730 | }) |
1731 | |
1732 | /* Make sure end is always >= buf */ |
1733 | if (end < buf) { |
1734 | end = ((void *)-1); |
1735 | size = end - buf; |
1736 | } |
1737 | |
1738 | while (*fmt) { |
1739 | const char *old_fmt = fmt; |
1740 | int read = format_decode(fmt, &spec); |
1741 | |
1742 | fmt += read; |
1743 | |
1744 | switch (spec.type) { |
1745 | case FORMAT_TYPE_NONE: { |
1746 | int copy = read; |
1747 | if (str < end) { |
1748 | if (copy > end - str) |
1749 | copy = end - str; |
1750 | memcpy(str, old_fmt, copy); |
1751 | } |
1752 | str += read; |
1753 | break; |
1754 | } |
1755 | |
1756 | case FORMAT_TYPE_WIDTH: |
1757 | spec.field_width = get_arg(int); |
1758 | break; |
1759 | |
1760 | case FORMAT_TYPE_PRECISION: |
1761 | spec.precision = get_arg(int); |
1762 | break; |
1763 | |
1764 | case FORMAT_TYPE_CHAR: { |
1765 | char c; |
1766 | |
1767 | if (!(spec.flags & LEFT)) { |
1768 | while (--spec.field_width > 0) { |
1769 | if (str < end) |
1770 | *str = ' '; |
1771 | ++str; |
1772 | } |
1773 | } |
1774 | c = (unsigned char) get_arg(char); |
1775 | if (str < end) |
1776 | *str = c; |
1777 | ++str; |
1778 | while (--spec.field_width > 0) { |
1779 | if (str < end) |
1780 | *str = ' '; |
1781 | ++str; |
1782 | } |
1783 | break; |
1784 | } |
1785 | |
1786 | case FORMAT_TYPE_STR: { |
1787 | const char *str_arg = args; |
1788 | args += strlen(str_arg) + 1; |
1789 | str = string(str, end, (char *)str_arg, spec); |
1790 | break; |
1791 | } |
1792 | |
1793 | case FORMAT_TYPE_PTR: |
1794 | str = pointer(fmt+1, str, end, get_arg(void *), spec); |
1795 | while (isalnum(*fmt)) |
1796 | fmt++; |
1797 | break; |
1798 | |
1799 | case FORMAT_TYPE_PERCENT_CHAR: |
1800 | case FORMAT_TYPE_INVALID: |
1801 | if (str < end) |
1802 | *str = '%'; |
1803 | ++str; |
1804 | break; |
1805 | |
1806 | case FORMAT_TYPE_NRCHARS: |
1807 | /* skip */ |
1808 | break; |
1809 | |
1810 | default: { |
1811 | unsigned long long num; |
1812 | |
1813 | switch (spec.type) { |
1814 | |
1815 | case FORMAT_TYPE_LONG_LONG: |
1816 | num = get_arg(long long); |
1817 | break; |
1818 | case FORMAT_TYPE_ULONG: |
1819 | case FORMAT_TYPE_LONG: |
1820 | num = get_arg(unsigned long); |
1821 | break; |
1822 | case FORMAT_TYPE_SIZE_T: |
1823 | num = get_arg(size_t); |
1824 | break; |
1825 | case FORMAT_TYPE_PTRDIFF: |
1826 | num = get_arg(ptrdiff_t); |
1827 | break; |
1828 | case FORMAT_TYPE_UBYTE: |
1829 | num = get_arg(unsigned char); |
1830 | break; |
1831 | case FORMAT_TYPE_BYTE: |
1832 | num = get_arg(signed char); |
1833 | break; |
1834 | case FORMAT_TYPE_USHORT: |
1835 | num = get_arg(unsigned short); |
1836 | break; |
1837 | case FORMAT_TYPE_SHORT: |
1838 | num = get_arg(short); |
1839 | break; |
1840 | case FORMAT_TYPE_UINT: |
1841 | num = get_arg(unsigned int); |
1842 | break; |
1843 | default: |
1844 | num = get_arg(int); |
1845 | } |
1846 | |
1847 | str = number(str, end, num, spec); |
1848 | } /* default: */ |
1849 | } /* switch(spec.type) */ |
1850 | } /* while(*fmt) */ |
1851 | |
1852 | if (size > 0) { |
1853 | if (str < end) |
1854 | *str = '\0'; |
1855 | else |
1856 | end[-1] = '\0'; |
1857 | } |
1858 | |
1859 | #undef get_arg |
1860 | |
1861 | /* the trailing null byte doesn't count towards the total */ |
1862 | return str - buf; |
1863 | } |
1864 | EXPORT_SYMBOL_GPL(bstr_printf); |
1865 | |
1866 | /** |
1867 | * bprintf - Parse a format string and place args' binary value in a buffer |
1868 | * @bin_buf: The buffer to place args' binary value |
1869 | * @size: The size of the buffer(by words(32bits), not characters) |
1870 | * @fmt: The format string to use |
1871 | * @...: Arguments for the format string |
1872 | * |
1873 | * The function returns the number of words(u32) written |
1874 | * into @bin_buf. |
1875 | */ |
1876 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) |
1877 | { |
1878 | va_list args; |
1879 | int ret; |
1880 | |
1881 | va_start(args, fmt); |
1882 | ret = vbin_printf(bin_buf, size, fmt, args); |
1883 | va_end(args); |
1884 | |
1885 | return ret; |
1886 | } |
1887 | EXPORT_SYMBOL_GPL(bprintf); |
1888 | |
1889 | #endif /* CONFIG_BINARY_PRINTF */ |
1890 | |
1891 | /** |
1892 | * vsscanf - Unformat a buffer into a list of arguments |
1893 | * @buf: input buffer |
1894 | * @fmt: format of buffer |
1895 | * @args: arguments |
1896 | */ |
1897 | int vsscanf(const char *buf, const char *fmt, va_list args) |
1898 | { |
1899 | const char *str = buf; |
1900 | char *next; |
1901 | char digit; |
1902 | int num = 0; |
1903 | u8 qualifier; |
1904 | u8 base; |
1905 | s16 field_width; |
1906 | bool is_sign; |
1907 | |
1908 | while (*fmt && *str) { |
1909 | /* skip any white space in format */ |
1910 | /* white space in format matchs any amount of |
1911 | * white space, including none, in the input. |
1912 | */ |
1913 | if (isspace(*fmt)) { |
1914 | fmt = skip_spaces(++fmt); |
1915 | str = skip_spaces(str); |
1916 | } |
1917 | |
1918 | /* anything that is not a conversion must match exactly */ |
1919 | if (*fmt != '%' && *fmt) { |
1920 | if (*fmt++ != *str++) |
1921 | break; |
1922 | continue; |
1923 | } |
1924 | |
1925 | if (!*fmt) |
1926 | break; |
1927 | ++fmt; |
1928 | |
1929 | /* skip this conversion. |
1930 | * advance both strings to next white space |
1931 | */ |
1932 | if (*fmt == '*') { |
1933 | while (!isspace(*fmt) && *fmt != '%' && *fmt) |
1934 | fmt++; |
1935 | while (!isspace(*str) && *str) |
1936 | str++; |
1937 | continue; |
1938 | } |
1939 | |
1940 | /* get field width */ |
1941 | field_width = -1; |
1942 | if (isdigit(*fmt)) |
1943 | field_width = skip_atoi(&fmt); |
1944 | |
1945 | /* get conversion qualifier */ |
1946 | qualifier = -1; |
1947 | if (*fmt == 'h' || TOLOWER(*fmt) == 'l' || |
1948 | TOLOWER(*fmt) == 'z') { |
1949 | qualifier = *fmt++; |
1950 | if (unlikely(qualifier == *fmt)) { |
1951 | if (qualifier == 'h') { |
1952 | qualifier = 'H'; |
1953 | fmt++; |
1954 | } else if (qualifier == 'l') { |
1955 | qualifier = 'L'; |
1956 | fmt++; |
1957 | } |
1958 | } |
1959 | } |
1960 | |
1961 | if (!*fmt || !*str) |
1962 | break; |
1963 | |
1964 | base = 10; |
1965 | is_sign = 0; |
1966 | |
1967 | switch (*fmt++) { |
1968 | case 'c': |
1969 | { |
1970 | char *s = (char *)va_arg(args, char*); |
1971 | if (field_width == -1) |
1972 | field_width = 1; |
1973 | do { |
1974 | *s++ = *str++; |
1975 | } while (--field_width > 0 && *str); |
1976 | num++; |
1977 | } |
1978 | continue; |
1979 | case 's': |
1980 | { |
1981 | char *s = (char *)va_arg(args, char *); |
1982 | if (field_width == -1) |
1983 | field_width = SHORT_MAX; |
1984 | /* first, skip leading white space in buffer */ |
1985 | str = skip_spaces(str); |
1986 | |
1987 | /* now copy until next white space */ |
1988 | while (*str && !isspace(*str) && field_width--) |
1989 | *s++ = *str++; |
1990 | *s = '\0'; |
1991 | num++; |
1992 | } |
1993 | continue; |
1994 | case 'n': |
1995 | /* return number of characters read so far */ |
1996 | { |
1997 | int *i = (int *)va_arg(args, int*); |
1998 | *i = str - buf; |
1999 | } |
2000 | continue; |
2001 | case 'o': |
2002 | base = 8; |
2003 | break; |
2004 | case 'x': |
2005 | case 'X': |
2006 | base = 16; |
2007 | break; |
2008 | case 'i': |
2009 | base = 0; |
2010 | case 'd': |
2011 | is_sign = 1; |
2012 | case 'u': |
2013 | break; |
2014 | case '%': |
2015 | /* looking for '%' in str */ |
2016 | if (*str++ != '%') |
2017 | return num; |
2018 | continue; |
2019 | default: |
2020 | /* invalid format; stop here */ |
2021 | return num; |
2022 | } |
2023 | |
2024 | /* have some sort of integer conversion. |
2025 | * first, skip white space in buffer. |
2026 | */ |
2027 | str = skip_spaces(str); |
2028 | |
2029 | digit = *str; |
2030 | if (is_sign && digit == '-') |
2031 | digit = *(str + 1); |
2032 | |
2033 | if (!digit |
2034 | || (base == 16 && !isxdigit(digit)) |
2035 | || (base == 10 && !isdigit(digit)) |
2036 | || (base == 8 && (!isdigit(digit) || digit > '7')) |
2037 | || (base == 0 && !isdigit(digit))) |
2038 | break; |
2039 | |
2040 | switch (qualifier) { |
2041 | case 'H': /* that's 'hh' in format */ |
2042 | if (is_sign) { |
2043 | signed char *s = (signed char *)va_arg(args, signed char *); |
2044 | *s = (signed char)simple_strtol(str, &next, base); |
2045 | } else { |
2046 | unsigned char *s = (unsigned char *)va_arg(args, unsigned char *); |
2047 | *s = (unsigned char)simple_strtoul(str, &next, base); |
2048 | } |
2049 | break; |
2050 | case 'h': |
2051 | if (is_sign) { |
2052 | short *s = (short *)va_arg(args, short *); |
2053 | *s = (short)simple_strtol(str, &next, base); |
2054 | } else { |
2055 | unsigned short *s = (unsigned short *)va_arg(args, unsigned short *); |
2056 | *s = (unsigned short)simple_strtoul(str, &next, base); |
2057 | } |
2058 | break; |
2059 | case 'l': |
2060 | if (is_sign) { |
2061 | long *l = (long *)va_arg(args, long *); |
2062 | *l = simple_strtol(str, &next, base); |
2063 | } else { |
2064 | unsigned long *l = (unsigned long *)va_arg(args, unsigned long *); |
2065 | *l = simple_strtoul(str, &next, base); |
2066 | } |
2067 | break; |
2068 | case 'L': |
2069 | if (is_sign) { |
2070 | long long *l = (long long *)va_arg(args, long long *); |
2071 | *l = simple_strtoll(str, &next, base); |
2072 | } else { |
2073 | unsigned long long *l = (unsigned long long *)va_arg(args, unsigned long long *); |
2074 | *l = simple_strtoull(str, &next, base); |
2075 | } |
2076 | break; |
2077 | case 'Z': |
2078 | case 'z': |
2079 | { |
2080 | size_t *s = (size_t *)va_arg(args, size_t *); |
2081 | *s = (size_t)simple_strtoul(str, &next, base); |
2082 | } |
2083 | break; |
2084 | default: |
2085 | if (is_sign) { |
2086 | int *i = (int *)va_arg(args, int *); |
2087 | *i = (int)simple_strtol(str, &next, base); |
2088 | } else { |
2089 | unsigned int *i = (unsigned int *)va_arg(args, unsigned int*); |
2090 | *i = (unsigned int)simple_strtoul(str, &next, base); |
2091 | } |
2092 | break; |
2093 | } |
2094 | num++; |
2095 | |
2096 | if (!next) |
2097 | break; |
2098 | str = next; |
2099 | } |
2100 | |
2101 | /* |
2102 | * Now we've come all the way through so either the input string or the |
2103 | * format ended. In the former case, there can be a %n at the current |
2104 | * position in the format that needs to be filled. |
2105 | */ |
2106 | if (*fmt == '%' && *(fmt + 1) == 'n') { |
2107 | int *p = (int *)va_arg(args, int *); |
2108 | *p = str - buf; |
2109 | } |
2110 | |
2111 | return num; |
2112 | } |
2113 | EXPORT_SYMBOL(vsscanf); |
2114 | |
2115 | /** |
2116 | * sscanf - Unformat a buffer into a list of arguments |
2117 | * @buf: input buffer |
2118 | * @fmt: formatting of buffer |
2119 | * @...: resulting arguments |
2120 | */ |
2121 | int sscanf(const char *buf, const char *fmt, ...) |
2122 | { |
2123 | va_list args; |
2124 | int i; |
2125 | |
2126 | va_start(args, fmt); |
2127 | i = vsscanf(buf, fmt, args); |
2128 | va_end(args); |
2129 | |
2130 | return i; |
2131 | } |
2132 | EXPORT_SYMBOL(sscanf); |
2133 |
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