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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> /* for KSYM_SYMBOL_LEN */ | |
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 | #include "kstrtox.h" | |
35 | ||
36 | /** | |
37 | * simple_strtoull - convert a string to an unsigned long long | |
38 | * @cp: The start of the string | |
39 | * @endp: A pointer to the end of the parsed string will be placed here | |
40 | * @base: The number base to use | |
41 | */ | |
42 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) | |
43 | { | |
44 | unsigned long long result; | |
45 | unsigned int rv; | |
46 | ||
47 | cp = _parse_integer_fixup_radix(cp, &base); | |
48 | rv = _parse_integer(cp, base, &result); | |
49 | /* FIXME */ | |
50 | cp += (rv & ~KSTRTOX_OVERFLOW); | |
51 | ||
52 | if (endp) | |
53 | *endp = (char *)cp; | |
54 | ||
55 | return result; | |
56 | } | |
57 | EXPORT_SYMBOL(simple_strtoull); | |
58 | ||
59 | /** | |
60 | * simple_strtoul - convert a string to an unsigned long | |
61 | * @cp: The start of the string | |
62 | * @endp: A pointer to the end of the parsed string will be placed here | |
63 | * @base: The number base to use | |
64 | */ | |
65 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) | |
66 | { | |
67 | return simple_strtoull(cp, endp, base); | |
68 | } | |
69 | EXPORT_SYMBOL(simple_strtoul); | |
70 | ||
71 | /** | |
72 | * simple_strtol - convert a string to a signed long | |
73 | * @cp: The start of the string | |
74 | * @endp: A pointer to the end of the parsed string will be placed here | |
75 | * @base: The number base to use | |
76 | */ | |
77 | long simple_strtol(const char *cp, char **endp, unsigned int base) | |
78 | { | |
79 | if (*cp == '-') | |
80 | return -simple_strtoul(cp + 1, endp, base); | |
81 | ||
82 | return simple_strtoul(cp, endp, base); | |
83 | } | |
84 | EXPORT_SYMBOL(simple_strtol); | |
85 | ||
86 | /** | |
87 | * simple_strtoll - convert a string to a signed long long | |
88 | * @cp: The start of the string | |
89 | * @endp: A pointer to the end of the parsed string will be placed here | |
90 | * @base: The number base to use | |
91 | */ | |
92 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) | |
93 | { | |
94 | if (*cp == '-') | |
95 | return -simple_strtoull(cp + 1, endp, base); | |
96 | ||
97 | return simple_strtoull(cp, endp, base); | |
98 | } | |
99 | EXPORT_SYMBOL(simple_strtoll); | |
100 | ||
101 | static noinline_for_stack | |
102 | int skip_atoi(const char **s) | |
103 | { | |
104 | int i = 0; | |
105 | ||
106 | while (isdigit(**s)) | |
107 | i = i*10 + *((*s)++) - '0'; | |
108 | ||
109 | return i; | |
110 | } | |
111 | ||
112 | /* Decimal conversion is by far the most typical, and is used | |
113 | * for /proc and /sys data. This directly impacts e.g. top performance | |
114 | * with many processes running. We optimize it for speed | |
115 | * using ideas described at <http://www.cs.uiowa.edu/~jones/bcd/divide.html> | |
116 | * (with permission from the author, Douglas W. Jones). | |
117 | */ | |
118 | ||
119 | #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64 | |
120 | /* Formats correctly any integer in [0, 999999999] */ | |
121 | static noinline_for_stack | |
122 | char *put_dec_full9(char *buf, unsigned q) | |
123 | { | |
124 | unsigned r; | |
125 | ||
126 | /* | |
127 | * Possible ways to approx. divide by 10 | |
128 | * (x * 0x1999999a) >> 32 x < 1073741829 (multiply must be 64-bit) | |
129 | * (x * 0xcccd) >> 19 x < 81920 (x < 262149 when 64-bit mul) | |
130 | * (x * 0x6667) >> 18 x < 43699 | |
131 | * (x * 0x3334) >> 17 x < 16389 | |
132 | * (x * 0x199a) >> 16 x < 16389 | |
133 | * (x * 0x0ccd) >> 15 x < 16389 | |
134 | * (x * 0x0667) >> 14 x < 2739 | |
135 | * (x * 0x0334) >> 13 x < 1029 | |
136 | * (x * 0x019a) >> 12 x < 1029 | |
137 | * (x * 0x00cd) >> 11 x < 1029 shorter code than * 0x67 (on i386) | |
138 | * (x * 0x0067) >> 10 x < 179 | |
139 | * (x * 0x0034) >> 9 x < 69 same | |
140 | * (x * 0x001a) >> 8 x < 69 same | |
141 | * (x * 0x000d) >> 7 x < 69 same, shortest code (on i386) | |
142 | * (x * 0x0007) >> 6 x < 19 | |
143 | * See <http://www.cs.uiowa.edu/~jones/bcd/divide.html> | |
144 | */ | |
145 | r = (q * (uint64_t)0x1999999a) >> 32; | |
146 | *buf++ = (q - 10 * r) + '0'; /* 1 */ | |
147 | q = (r * (uint64_t)0x1999999a) >> 32; | |
148 | *buf++ = (r - 10 * q) + '0'; /* 2 */ | |
149 | r = (q * (uint64_t)0x1999999a) >> 32; | |
150 | *buf++ = (q - 10 * r) + '0'; /* 3 */ | |
151 | q = (r * (uint64_t)0x1999999a) >> 32; | |
152 | *buf++ = (r - 10 * q) + '0'; /* 4 */ | |
153 | r = (q * (uint64_t)0x1999999a) >> 32; | |
154 | *buf++ = (q - 10 * r) + '0'; /* 5 */ | |
155 | /* Now value is under 10000, can avoid 64-bit multiply */ | |
156 | q = (r * 0x199a) >> 16; | |
157 | *buf++ = (r - 10 * q) + '0'; /* 6 */ | |
158 | r = (q * 0xcd) >> 11; | |
159 | *buf++ = (q - 10 * r) + '0'; /* 7 */ | |
160 | q = (r * 0xcd) >> 11; | |
161 | *buf++ = (r - 10 * q) + '0'; /* 8 */ | |
162 | *buf++ = q + '0'; /* 9 */ | |
163 | return buf; | |
164 | } | |
165 | #endif | |
166 | ||
167 | /* Similar to above but do not pad with zeros. | |
168 | * Code can be easily arranged to print 9 digits too, but our callers | |
169 | * always call put_dec_full9() instead when the number has 9 decimal digits. | |
170 | */ | |
171 | static noinline_for_stack | |
172 | char *put_dec_trunc8(char *buf, unsigned r) | |
173 | { | |
174 | unsigned q; | |
175 | ||
176 | /* Copy of previous function's body with added early returns */ | |
177 | while (r >= 10000) { | |
178 | q = r + '0'; | |
179 | r = (r * (uint64_t)0x1999999a) >> 32; | |
180 | *buf++ = q - 10*r; | |
181 | } | |
182 | ||
183 | q = (r * 0x199a) >> 16; /* r <= 9999 */ | |
184 | *buf++ = (r - 10 * q) + '0'; | |
185 | if (q == 0) | |
186 | return buf; | |
187 | r = (q * 0xcd) >> 11; /* q <= 999 */ | |
188 | *buf++ = (q - 10 * r) + '0'; | |
189 | if (r == 0) | |
190 | return buf; | |
191 | q = (r * 0xcd) >> 11; /* r <= 99 */ | |
192 | *buf++ = (r - 10 * q) + '0'; | |
193 | if (q == 0) | |
194 | return buf; | |
195 | *buf++ = q + '0'; /* q <= 9 */ | |
196 | return buf; | |
197 | } | |
198 | ||
199 | /* There are two algorithms to print larger numbers. | |
200 | * One is generic: divide by 1000000000 and repeatedly print | |
201 | * groups of (up to) 9 digits. It's conceptually simple, | |
202 | * but requires a (unsigned long long) / 1000000000 division. | |
203 | * | |
204 | * Second algorithm splits 64-bit unsigned long long into 16-bit chunks, | |
205 | * manipulates them cleverly and generates groups of 4 decimal digits. | |
206 | * It so happens that it does NOT require long long division. | |
207 | * | |
208 | * If long is > 32 bits, division of 64-bit values is relatively easy, | |
209 | * and we will use the first algorithm. | |
210 | * If long long is > 64 bits (strange architecture with VERY large long long), | |
211 | * second algorithm can't be used, and we again use the first one. | |
212 | * | |
213 | * Else (if long is 32 bits and long long is 64 bits) we use second one. | |
214 | */ | |
215 | ||
216 | #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64 | |
217 | ||
218 | /* First algorithm: generic */ | |
219 | ||
220 | static | |
221 | char *put_dec(char *buf, unsigned long long n) | |
222 | { | |
223 | if (n >= 100*1000*1000) { | |
224 | while (n >= 1000*1000*1000) | |
225 | buf = put_dec_full9(buf, do_div(n, 1000*1000*1000)); | |
226 | if (n >= 100*1000*1000) | |
227 | return put_dec_full9(buf, n); | |
228 | } | |
229 | return put_dec_trunc8(buf, n); | |
230 | } | |
231 | ||
232 | #else | |
233 | ||
234 | /* Second algorithm: valid only for 64-bit long longs */ | |
235 | ||
236 | /* See comment in put_dec_full9 for choice of constants */ | |
237 | static noinline_for_stack | |
238 | void put_dec_full4(char *buf, unsigned q) | |
239 | { | |
240 | unsigned r; | |
241 | r = (q * 0xccd) >> 15; | |
242 | buf[0] = (q - 10 * r) + '0'; | |
243 | q = (r * 0xcd) >> 11; | |
244 | buf[1] = (r - 10 * q) + '0'; | |
245 | r = (q * 0xcd) >> 11; | |
246 | buf[2] = (q - 10 * r) + '0'; | |
247 | buf[3] = r + '0'; | |
248 | } | |
249 | ||
250 | /* | |
251 | * Call put_dec_full4 on x % 10000, return x / 10000. | |
252 | * The approximation x/10000 == (x * 0x346DC5D7) >> 43 | |
253 | * holds for all x < 1,128,869,999. The largest value this | |
254 | * helper will ever be asked to convert is 1,125,520,955. | |
255 | * (d1 in the put_dec code, assuming n is all-ones). | |
256 | */ | |
257 | static | |
258 | unsigned put_dec_helper4(char *buf, unsigned x) | |
259 | { | |
260 | uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43; | |
261 | ||
262 | put_dec_full4(buf, x - q * 10000); | |
263 | return q; | |
264 | } | |
265 | ||
266 | /* Based on code by Douglas W. Jones found at | |
267 | * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour> | |
268 | * (with permission from the author). | |
269 | * Performs no 64-bit division and hence should be fast on 32-bit machines. | |
270 | */ | |
271 | static | |
272 | char *put_dec(char *buf, unsigned long long n) | |
273 | { | |
274 | uint32_t d3, d2, d1, q, h; | |
275 | ||
276 | if (n < 100*1000*1000) | |
277 | return put_dec_trunc8(buf, n); | |
278 | ||
279 | d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */ | |
280 | h = (n >> 32); | |
281 | d2 = (h ) & 0xffff; | |
282 | d3 = (h >> 16); /* implicit "& 0xffff" */ | |
283 | ||
284 | q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff); | |
285 | q = put_dec_helper4(buf, q); | |
286 | ||
287 | q += 7671 * d3 + 9496 * d2 + 6 * d1; | |
288 | q = put_dec_helper4(buf+4, q); | |
289 | ||
290 | q += 4749 * d3 + 42 * d2; | |
291 | q = put_dec_helper4(buf+8, q); | |
292 | ||
293 | q += 281 * d3; | |
294 | buf += 12; | |
295 | if (q) | |
296 | buf = put_dec_trunc8(buf, q); | |
297 | else while (buf[-1] == '0') | |
298 | --buf; | |
299 | ||
300 | return buf; | |
301 | } | |
302 | ||
303 | #endif | |
304 | ||
305 | /* | |
306 | * Convert passed number to decimal string. | |
307 | * Returns the length of string. On buffer overflow, returns 0. | |
308 | * | |
309 | * If speed is not important, use snprintf(). It's easy to read the code. | |
310 | */ | |
311 | int num_to_str(char *buf, int size, unsigned long long num) | |
312 | { | |
313 | char tmp[sizeof(num) * 3]; | |
314 | int idx, len; | |
315 | ||
316 | /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */ | |
317 | if (num <= 9) { | |
318 | tmp[0] = '0' + num; | |
319 | len = 1; | |
320 | } else { | |
321 | len = put_dec(tmp, num) - tmp; | |
322 | } | |
323 | ||
324 | if (len > size) | |
325 | return 0; | |
326 | for (idx = 0; idx < len; ++idx) | |
327 | buf[idx] = tmp[len - idx - 1]; | |
328 | return len; | |
329 | } | |
330 | ||
331 | #define ZEROPAD 1 /* pad with zero */ | |
332 | #define SIGN 2 /* unsigned/signed long */ | |
333 | #define PLUS 4 /* show plus */ | |
334 | #define SPACE 8 /* space if plus */ | |
335 | #define LEFT 16 /* left justified */ | |
336 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ | |
337 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ | |
338 | ||
339 | enum format_type { | |
340 | FORMAT_TYPE_NONE, /* Just a string part */ | |
341 | FORMAT_TYPE_WIDTH, | |
342 | FORMAT_TYPE_PRECISION, | |
343 | FORMAT_TYPE_CHAR, | |
344 | FORMAT_TYPE_STR, | |
345 | FORMAT_TYPE_PTR, | |
346 | FORMAT_TYPE_PERCENT_CHAR, | |
347 | FORMAT_TYPE_INVALID, | |
348 | FORMAT_TYPE_LONG_LONG, | |
349 | FORMAT_TYPE_ULONG, | |
350 | FORMAT_TYPE_LONG, | |
351 | FORMAT_TYPE_UBYTE, | |
352 | FORMAT_TYPE_BYTE, | |
353 | FORMAT_TYPE_USHORT, | |
354 | FORMAT_TYPE_SHORT, | |
355 | FORMAT_TYPE_UINT, | |
356 | FORMAT_TYPE_INT, | |
357 | FORMAT_TYPE_NRCHARS, | |
358 | FORMAT_TYPE_SIZE_T, | |
359 | FORMAT_TYPE_PTRDIFF | |
360 | }; | |
361 | ||
362 | struct printf_spec { | |
363 | u8 type; /* format_type enum */ | |
364 | u8 flags; /* flags to number() */ | |
365 | u8 base; /* number base, 8, 10 or 16 only */ | |
366 | u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */ | |
367 | s16 field_width; /* width of output field */ | |
368 | s16 precision; /* # of digits/chars */ | |
369 | }; | |
370 | ||
371 | static noinline_for_stack | |
372 | char *number(char *buf, char *end, unsigned long long num, | |
373 | struct printf_spec spec) | |
374 | { | |
375 | /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ | |
376 | static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ | |
377 | ||
378 | char tmp[66]; | |
379 | char sign; | |
380 | char locase; | |
381 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); | |
382 | int i; | |
383 | bool is_zero = num == 0LL; | |
384 | ||
385 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' | |
386 | * produces same digits or (maybe lowercased) letters */ | |
387 | locase = (spec.flags & SMALL); | |
388 | if (spec.flags & LEFT) | |
389 | spec.flags &= ~ZEROPAD; | |
390 | sign = 0; | |
391 | if (spec.flags & SIGN) { | |
392 | if ((signed long long)num < 0) { | |
393 | sign = '-'; | |
394 | num = -(signed long long)num; | |
395 | spec.field_width--; | |
396 | } else if (spec.flags & PLUS) { | |
397 | sign = '+'; | |
398 | spec.field_width--; | |
399 | } else if (spec.flags & SPACE) { | |
400 | sign = ' '; | |
401 | spec.field_width--; | |
402 | } | |
403 | } | |
404 | if (need_pfx) { | |
405 | if (spec.base == 16) | |
406 | spec.field_width -= 2; | |
407 | else if (!is_zero) | |
408 | spec.field_width--; | |
409 | } | |
410 | ||
411 | /* generate full string in tmp[], in reverse order */ | |
412 | i = 0; | |
413 | if (num < spec.base) | |
414 | tmp[i++] = digits[num] | locase; | |
415 | /* Generic code, for any base: | |
416 | else do { | |
417 | tmp[i++] = (digits[do_div(num,base)] | locase); | |
418 | } while (num != 0); | |
419 | */ | |
420 | else if (spec.base != 10) { /* 8 or 16 */ | |
421 | int mask = spec.base - 1; | |
422 | int shift = 3; | |
423 | ||
424 | if (spec.base == 16) | |
425 | shift = 4; | |
426 | do { | |
427 | tmp[i++] = (digits[((unsigned char)num) & mask] | locase); | |
428 | num >>= shift; | |
429 | } while (num); | |
430 | } else { /* base 10 */ | |
431 | i = put_dec(tmp, num) - tmp; | |
432 | } | |
433 | ||
434 | /* printing 100 using %2d gives "100", not "00" */ | |
435 | if (i > spec.precision) | |
436 | spec.precision = i; | |
437 | /* leading space padding */ | |
438 | spec.field_width -= spec.precision; | |
439 | if (!(spec.flags & (ZEROPAD+LEFT))) { | |
440 | while (--spec.field_width >= 0) { | |
441 | if (buf < end) | |
442 | *buf = ' '; | |
443 | ++buf; | |
444 | } | |
445 | } | |
446 | /* sign */ | |
447 | if (sign) { | |
448 | if (buf < end) | |
449 | *buf = sign; | |
450 | ++buf; | |
451 | } | |
452 | /* "0x" / "0" prefix */ | |
453 | if (need_pfx) { | |
454 | if (spec.base == 16 || !is_zero) { | |
455 | if (buf < end) | |
456 | *buf = '0'; | |
457 | ++buf; | |
458 | } | |
459 | if (spec.base == 16) { | |
460 | if (buf < end) | |
461 | *buf = ('X' | locase); | |
462 | ++buf; | |
463 | } | |
464 | } | |
465 | /* zero or space padding */ | |
466 | if (!(spec.flags & LEFT)) { | |
467 | char c = (spec.flags & ZEROPAD) ? '0' : ' '; | |
468 | while (--spec.field_width >= 0) { | |
469 | if (buf < end) | |
470 | *buf = c; | |
471 | ++buf; | |
472 | } | |
473 | } | |
474 | /* hmm even more zero padding? */ | |
475 | while (i <= --spec.precision) { | |
476 | if (buf < end) | |
477 | *buf = '0'; | |
478 | ++buf; | |
479 | } | |
480 | /* actual digits of result */ | |
481 | while (--i >= 0) { | |
482 | if (buf < end) | |
483 | *buf = tmp[i]; | |
484 | ++buf; | |
485 | } | |
486 | /* trailing space padding */ | |
487 | while (--spec.field_width >= 0) { | |
488 | if (buf < end) | |
489 | *buf = ' '; | |
490 | ++buf; | |
491 | } | |
492 | ||
493 | return buf; | |
494 | } | |
495 | ||
496 | static noinline_for_stack | |
497 | char *string(char *buf, char *end, const char *s, struct printf_spec spec) | |
498 | { | |
499 | int len, i; | |
500 | ||
501 | if ((unsigned long)s < PAGE_SIZE) | |
502 | s = "(null)"; | |
503 | ||
504 | len = strnlen(s, spec.precision); | |
505 | ||
506 | if (!(spec.flags & LEFT)) { | |
507 | while (len < spec.field_width--) { | |
508 | if (buf < end) | |
509 | *buf = ' '; | |
510 | ++buf; | |
511 | } | |
512 | } | |
513 | for (i = 0; i < len; ++i) { | |
514 | if (buf < end) | |
515 | *buf = *s; | |
516 | ++buf; ++s; | |
517 | } | |
518 | while (len < spec.field_width--) { | |
519 | if (buf < end) | |
520 | *buf = ' '; | |
521 | ++buf; | |
522 | } | |
523 | ||
524 | return buf; | |
525 | } | |
526 | ||
527 | static noinline_for_stack | |
528 | char *symbol_string(char *buf, char *end, void *ptr, | |
529 | struct printf_spec spec, char ext) | |
530 | { | |
531 | unsigned long value = (unsigned long) ptr; | |
532 | #ifdef CONFIG_KALLSYMS | |
533 | char sym[KSYM_SYMBOL_LEN]; | |
534 | if (ext == 'B') | |
535 | sprint_backtrace(sym, value); | |
536 | else if (ext != 'f' && ext != 's') | |
537 | sprint_symbol(sym, value); | |
538 | else | |
539 | sprint_symbol_no_offset(sym, value); | |
540 | ||
541 | return string(buf, end, sym, spec); | |
542 | #else | |
543 | spec.field_width = 2 * sizeof(void *); | |
544 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
545 | spec.base = 16; | |
546 | ||
547 | return number(buf, end, value, spec); | |
548 | #endif | |
549 | } | |
550 | ||
551 | static noinline_for_stack | |
552 | char *resource_string(char *buf, char *end, struct resource *res, | |
553 | struct printf_spec spec, const char *fmt) | |
554 | { | |
555 | #ifndef IO_RSRC_PRINTK_SIZE | |
556 | #define IO_RSRC_PRINTK_SIZE 6 | |
557 | #endif | |
558 | ||
559 | #ifndef MEM_RSRC_PRINTK_SIZE | |
560 | #define MEM_RSRC_PRINTK_SIZE 10 | |
561 | #endif | |
562 | static const struct printf_spec io_spec = { | |
563 | .base = 16, | |
564 | .field_width = IO_RSRC_PRINTK_SIZE, | |
565 | .precision = -1, | |
566 | .flags = SPECIAL | SMALL | ZEROPAD, | |
567 | }; | |
568 | static const struct printf_spec mem_spec = { | |
569 | .base = 16, | |
570 | .field_width = MEM_RSRC_PRINTK_SIZE, | |
571 | .precision = -1, | |
572 | .flags = SPECIAL | SMALL | ZEROPAD, | |
573 | }; | |
574 | static const struct printf_spec bus_spec = { | |
575 | .base = 16, | |
576 | .field_width = 2, | |
577 | .precision = -1, | |
578 | .flags = SMALL | ZEROPAD, | |
579 | }; | |
580 | static const struct printf_spec dec_spec = { | |
581 | .base = 10, | |
582 | .precision = -1, | |
583 | .flags = 0, | |
584 | }; | |
585 | static const struct printf_spec str_spec = { | |
586 | .field_width = -1, | |
587 | .precision = 10, | |
588 | .flags = LEFT, | |
589 | }; | |
590 | static const struct printf_spec flag_spec = { | |
591 | .base = 16, | |
592 | .precision = -1, | |
593 | .flags = SPECIAL | SMALL, | |
594 | }; | |
595 | ||
596 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) | |
597 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ | |
598 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) | |
599 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) | |
600 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") | |
601 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") | |
602 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, | |
603 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; | |
604 | ||
605 | char *p = sym, *pend = sym + sizeof(sym); | |
606 | int decode = (fmt[0] == 'R') ? 1 : 0; | |
607 | const struct printf_spec *specp; | |
608 | ||
609 | *p++ = '['; | |
610 | if (res->flags & IORESOURCE_IO) { | |
611 | p = string(p, pend, "io ", str_spec); | |
612 | specp = &io_spec; | |
613 | } else if (res->flags & IORESOURCE_MEM) { | |
614 | p = string(p, pend, "mem ", str_spec); | |
615 | specp = &mem_spec; | |
616 | } else if (res->flags & IORESOURCE_IRQ) { | |
617 | p = string(p, pend, "irq ", str_spec); | |
618 | specp = &dec_spec; | |
619 | } else if (res->flags & IORESOURCE_DMA) { | |
620 | p = string(p, pend, "dma ", str_spec); | |
621 | specp = &dec_spec; | |
622 | } else if (res->flags & IORESOURCE_BUS) { | |
623 | p = string(p, pend, "bus ", str_spec); | |
624 | specp = &bus_spec; | |
625 | } else { | |
626 | p = string(p, pend, "??? ", str_spec); | |
627 | specp = &mem_spec; | |
628 | decode = 0; | |
629 | } | |
630 | p = number(p, pend, res->start, *specp); | |
631 | if (res->start != res->end) { | |
632 | *p++ = '-'; | |
633 | p = number(p, pend, res->end, *specp); | |
634 | } | |
635 | if (decode) { | |
636 | if (res->flags & IORESOURCE_MEM_64) | |
637 | p = string(p, pend, " 64bit", str_spec); | |
638 | if (res->flags & IORESOURCE_PREFETCH) | |
639 | p = string(p, pend, " pref", str_spec); | |
640 | if (res->flags & IORESOURCE_WINDOW) | |
641 | p = string(p, pend, " window", str_spec); | |
642 | if (res->flags & IORESOURCE_DISABLED) | |
643 | p = string(p, pend, " disabled", str_spec); | |
644 | } else { | |
645 | p = string(p, pend, " flags ", str_spec); | |
646 | p = number(p, pend, res->flags, flag_spec); | |
647 | } | |
648 | *p++ = ']'; | |
649 | *p = '\0'; | |
650 | ||
651 | return string(buf, end, sym, spec); | |
652 | } | |
653 | ||
654 | static noinline_for_stack | |
655 | char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
656 | const char *fmt) | |
657 | { | |
658 | int i, len = 1; /* if we pass '%ph[CDN]', field witdh remains | |
659 | negative value, fallback to the default */ | |
660 | char separator; | |
661 | ||
662 | if (spec.field_width == 0) | |
663 | /* nothing to print */ | |
664 | return buf; | |
665 | ||
666 | if (ZERO_OR_NULL_PTR(addr)) | |
667 | /* NULL pointer */ | |
668 | return string(buf, end, NULL, spec); | |
669 | ||
670 | switch (fmt[1]) { | |
671 | case 'C': | |
672 | separator = ':'; | |
673 | break; | |
674 | case 'D': | |
675 | separator = '-'; | |
676 | break; | |
677 | case 'N': | |
678 | separator = 0; | |
679 | break; | |
680 | default: | |
681 | separator = ' '; | |
682 | break; | |
683 | } | |
684 | ||
685 | if (spec.field_width > 0) | |
686 | len = min_t(int, spec.field_width, 64); | |
687 | ||
688 | for (i = 0; i < len && buf < end - 1; i++) { | |
689 | buf = hex_byte_pack(buf, addr[i]); | |
690 | ||
691 | if (buf < end && separator && i != len - 1) | |
692 | *buf++ = separator; | |
693 | } | |
694 | ||
695 | return buf; | |
696 | } | |
697 | ||
698 | static noinline_for_stack | |
699 | char *mac_address_string(char *buf, char *end, u8 *addr, | |
700 | struct printf_spec spec, const char *fmt) | |
701 | { | |
702 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; | |
703 | char *p = mac_addr; | |
704 | int i; | |
705 | char separator; | |
706 | bool reversed = false; | |
707 | ||
708 | switch (fmt[1]) { | |
709 | case 'F': | |
710 | separator = '-'; | |
711 | break; | |
712 | ||
713 | case 'R': | |
714 | reversed = true; | |
715 | /* fall through */ | |
716 | ||
717 | default: | |
718 | separator = ':'; | |
719 | break; | |
720 | } | |
721 | ||
722 | for (i = 0; i < 6; i++) { | |
723 | if (reversed) | |
724 | p = hex_byte_pack(p, addr[5 - i]); | |
725 | else | |
726 | p = hex_byte_pack(p, addr[i]); | |
727 | ||
728 | if (fmt[0] == 'M' && i != 5) | |
729 | *p++ = separator; | |
730 | } | |
731 | *p = '\0'; | |
732 | ||
733 | return string(buf, end, mac_addr, spec); | |
734 | } | |
735 | ||
736 | static noinline_for_stack | |
737 | char *ip4_string(char *p, const u8 *addr, const char *fmt) | |
738 | { | |
739 | int i; | |
740 | bool leading_zeros = (fmt[0] == 'i'); | |
741 | int index; | |
742 | int step; | |
743 | ||
744 | switch (fmt[2]) { | |
745 | case 'h': | |
746 | #ifdef __BIG_ENDIAN | |
747 | index = 0; | |
748 | step = 1; | |
749 | #else | |
750 | index = 3; | |
751 | step = -1; | |
752 | #endif | |
753 | break; | |
754 | case 'l': | |
755 | index = 3; | |
756 | step = -1; | |
757 | break; | |
758 | case 'n': | |
759 | case 'b': | |
760 | default: | |
761 | index = 0; | |
762 | step = 1; | |
763 | break; | |
764 | } | |
765 | for (i = 0; i < 4; i++) { | |
766 | char temp[3]; /* hold each IP quad in reverse order */ | |
767 | int digits = put_dec_trunc8(temp, addr[index]) - temp; | |
768 | if (leading_zeros) { | |
769 | if (digits < 3) | |
770 | *p++ = '0'; | |
771 | if (digits < 2) | |
772 | *p++ = '0'; | |
773 | } | |
774 | /* reverse the digits in the quad */ | |
775 | while (digits--) | |
776 | *p++ = temp[digits]; | |
777 | if (i < 3) | |
778 | *p++ = '.'; | |
779 | index += step; | |
780 | } | |
781 | *p = '\0'; | |
782 | ||
783 | return p; | |
784 | } | |
785 | ||
786 | static noinline_for_stack | |
787 | char *ip6_compressed_string(char *p, const char *addr) | |
788 | { | |
789 | int i, j, range; | |
790 | unsigned char zerolength[8]; | |
791 | int longest = 1; | |
792 | int colonpos = -1; | |
793 | u16 word; | |
794 | u8 hi, lo; | |
795 | bool needcolon = false; | |
796 | bool useIPv4; | |
797 | struct in6_addr in6; | |
798 | ||
799 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
800 | ||
801 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
802 | ||
803 | memset(zerolength, 0, sizeof(zerolength)); | |
804 | ||
805 | if (useIPv4) | |
806 | range = 6; | |
807 | else | |
808 | range = 8; | |
809 | ||
810 | /* find position of longest 0 run */ | |
811 | for (i = 0; i < range; i++) { | |
812 | for (j = i; j < range; j++) { | |
813 | if (in6.s6_addr16[j] != 0) | |
814 | break; | |
815 | zerolength[i]++; | |
816 | } | |
817 | } | |
818 | for (i = 0; i < range; i++) { | |
819 | if (zerolength[i] > longest) { | |
820 | longest = zerolength[i]; | |
821 | colonpos = i; | |
822 | } | |
823 | } | |
824 | if (longest == 1) /* don't compress a single 0 */ | |
825 | colonpos = -1; | |
826 | ||
827 | /* emit address */ | |
828 | for (i = 0; i < range; i++) { | |
829 | if (i == colonpos) { | |
830 | if (needcolon || i == 0) | |
831 | *p++ = ':'; | |
832 | *p++ = ':'; | |
833 | needcolon = false; | |
834 | i += longest - 1; | |
835 | continue; | |
836 | } | |
837 | if (needcolon) { | |
838 | *p++ = ':'; | |
839 | needcolon = false; | |
840 | } | |
841 | /* hex u16 without leading 0s */ | |
842 | word = ntohs(in6.s6_addr16[i]); | |
843 | hi = word >> 8; | |
844 | lo = word & 0xff; | |
845 | if (hi) { | |
846 | if (hi > 0x0f) | |
847 | p = hex_byte_pack(p, hi); | |
848 | else | |
849 | *p++ = hex_asc_lo(hi); | |
850 | p = hex_byte_pack(p, lo); | |
851 | } | |
852 | else if (lo > 0x0f) | |
853 | p = hex_byte_pack(p, lo); | |
854 | else | |
855 | *p++ = hex_asc_lo(lo); | |
856 | needcolon = true; | |
857 | } | |
858 | ||
859 | if (useIPv4) { | |
860 | if (needcolon) | |
861 | *p++ = ':'; | |
862 | p = ip4_string(p, &in6.s6_addr[12], "I4"); | |
863 | } | |
864 | *p = '\0'; | |
865 | ||
866 | return p; | |
867 | } | |
868 | ||
869 | static noinline_for_stack | |
870 | char *ip6_string(char *p, const char *addr, const char *fmt) | |
871 | { | |
872 | int i; | |
873 | ||
874 | for (i = 0; i < 8; i++) { | |
875 | p = hex_byte_pack(p, *addr++); | |
876 | p = hex_byte_pack(p, *addr++); | |
877 | if (fmt[0] == 'I' && i != 7) | |
878 | *p++ = ':'; | |
879 | } | |
880 | *p = '\0'; | |
881 | ||
882 | return p; | |
883 | } | |
884 | ||
885 | static noinline_for_stack | |
886 | char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
887 | struct printf_spec spec, const char *fmt) | |
888 | { | |
889 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
890 | ||
891 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
892 | ip6_compressed_string(ip6_addr, addr); | |
893 | else | |
894 | ip6_string(ip6_addr, addr, fmt); | |
895 | ||
896 | return string(buf, end, ip6_addr, spec); | |
897 | } | |
898 | ||
899 | static noinline_for_stack | |
900 | char *ip4_addr_string(char *buf, char *end, const u8 *addr, | |
901 | struct printf_spec spec, const char *fmt) | |
902 | { | |
903 | char ip4_addr[sizeof("255.255.255.255")]; | |
904 | ||
905 | ip4_string(ip4_addr, addr, fmt); | |
906 | ||
907 | return string(buf, end, ip4_addr, spec); | |
908 | } | |
909 | ||
910 | static noinline_for_stack | |
911 | char *uuid_string(char *buf, char *end, const u8 *addr, | |
912 | struct printf_spec spec, const char *fmt) | |
913 | { | |
914 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; | |
915 | char *p = uuid; | |
916 | int i; | |
917 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; | |
918 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; | |
919 | const u8 *index = be; | |
920 | bool uc = false; | |
921 | ||
922 | switch (*(++fmt)) { | |
923 | case 'L': | |
924 | uc = true; /* fall-through */ | |
925 | case 'l': | |
926 | index = le; | |
927 | break; | |
928 | case 'B': | |
929 | uc = true; | |
930 | break; | |
931 | } | |
932 | ||
933 | for (i = 0; i < 16; i++) { | |
934 | p = hex_byte_pack(p, addr[index[i]]); | |
935 | switch (i) { | |
936 | case 3: | |
937 | case 5: | |
938 | case 7: | |
939 | case 9: | |
940 | *p++ = '-'; | |
941 | break; | |
942 | } | |
943 | } | |
944 | ||
945 | *p = 0; | |
946 | ||
947 | if (uc) { | |
948 | p = uuid; | |
949 | do { | |
950 | *p = toupper(*p); | |
951 | } while (*(++p)); | |
952 | } | |
953 | ||
954 | return string(buf, end, uuid, spec); | |
955 | } | |
956 | ||
957 | static | |
958 | char *netdev_feature_string(char *buf, char *end, const u8 *addr, | |
959 | struct printf_spec spec) | |
960 | { | |
961 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
962 | if (spec.field_width == -1) | |
963 | spec.field_width = 2 + 2 * sizeof(netdev_features_t); | |
964 | spec.base = 16; | |
965 | ||
966 | return number(buf, end, *(const netdev_features_t *)addr, spec); | |
967 | } | |
968 | ||
969 | int kptr_restrict __read_mostly; | |
970 | ||
971 | /* | |
972 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
973 | * by an extra set of alphanumeric characters that are extended format | |
974 | * specifiers. | |
975 | * | |
976 | * Right now we handle: | |
977 | * | |
978 | * - 'F' For symbolic function descriptor pointers with offset | |
979 | * - 'f' For simple symbolic function names without offset | |
980 | * - 'S' For symbolic direct pointers with offset | |
981 | * - 's' For symbolic direct pointers without offset | |
982 | * - 'B' For backtraced symbolic direct pointers with offset | |
983 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] | |
984 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
985 | * - 'M' For a 6-byte MAC address, it prints the address in the | |
986 | * usual colon-separated hex notation | |
987 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons | |
988 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address | |
989 | * with a dash-separated hex notation | |
990 | * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth) | |
991 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way | |
992 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
993 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
994 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses | |
995 | * IPv6 omits the colons (01020304...0f) | |
996 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
997 | * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order | |
998 | * - 'I6c' for IPv6 addresses printed as specified by | |
999 | * http://tools.ietf.org/html/rfc5952 | |
1000 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form | |
1001 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" | |
1002 | * Options for %pU are: | |
1003 | * b big endian lower case hex (default) | |
1004 | * B big endian UPPER case hex | |
1005 | * l little endian lower case hex | |
1006 | * L little endian UPPER case hex | |
1007 | * big endian output byte order is: | |
1008 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] | |
1009 | * little endian output byte order is: | |
1010 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] | |
1011 | * - 'V' For a struct va_format which contains a format string * and va_list *, | |
1012 | * call vsnprintf(->format, *->va_list). | |
1013 | * Implements a "recursive vsnprintf". | |
1014 | * Do not use this feature without some mechanism to verify the | |
1015 | * correctness of the format string and va_list arguments. | |
1016 | * - 'K' For a kernel pointer that should be hidden from unprivileged users | |
1017 | * - 'NF' For a netdev_features_t | |
1018 | * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with | |
1019 | * a certain separator (' ' by default): | |
1020 | * C colon | |
1021 | * D dash | |
1022 | * N no separator | |
1023 | * The maximum supported length is 64 bytes of the input. Consider | |
1024 | * to use print_hex_dump() for the larger input. | |
1025 | * | |
1026 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 | |
1027 | * function pointers are really function descriptors, which contain a | |
1028 | * pointer to the real address. | |
1029 | */ | |
1030 | static noinline_for_stack | |
1031 | char *pointer(const char *fmt, char *buf, char *end, void *ptr, | |
1032 | struct printf_spec spec) | |
1033 | { | |
1034 | int default_width = 2 * sizeof(void *) + (spec.flags & SPECIAL ? 2 : 0); | |
1035 | ||
1036 | if (!ptr && *fmt != 'K') { | |
1037 | /* | |
1038 | * Print (null) with the same width as a pointer so it makes | |
1039 | * tabular output look nice. | |
1040 | */ | |
1041 | if (spec.field_width == -1) | |
1042 | spec.field_width = default_width; | |
1043 | return string(buf, end, "(null)", spec); | |
1044 | } | |
1045 | ||
1046 | switch (*fmt) { | |
1047 | case 'F': | |
1048 | case 'f': | |
1049 | ptr = dereference_function_descriptor(ptr); | |
1050 | /* Fallthrough */ | |
1051 | case 'S': | |
1052 | case 's': | |
1053 | case 'B': | |
1054 | return symbol_string(buf, end, ptr, spec, *fmt); | |
1055 | case 'R': | |
1056 | case 'r': | |
1057 | return resource_string(buf, end, ptr, spec, fmt); | |
1058 | case 'h': | |
1059 | return hex_string(buf, end, ptr, spec, fmt); | |
1060 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ | |
1061 | case 'm': /* Contiguous: 000102030405 */ | |
1062 | /* [mM]F (FDDI) */ | |
1063 | /* [mM]R (Reverse order; Bluetooth) */ | |
1064 | return mac_address_string(buf, end, ptr, spec, fmt); | |
1065 | case 'I': /* Formatted IP supported | |
1066 | * 4: 1.2.3.4 | |
1067 | * 6: 0001:0203:...:0708 | |
1068 | * 6c: 1::708 or 1::1.2.3.4 | |
1069 | */ | |
1070 | case 'i': /* Contiguous: | |
1071 | * 4: 001.002.003.004 | |
1072 | * 6: 000102...0f | |
1073 | */ | |
1074 | switch (fmt[1]) { | |
1075 | case '6': | |
1076 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
1077 | case '4': | |
1078 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
1079 | } | |
1080 | break; | |
1081 | case 'U': | |
1082 | return uuid_string(buf, end, ptr, spec, fmt); | |
1083 | case 'V': | |
1084 | { | |
1085 | va_list va; | |
1086 | ||
1087 | va_copy(va, *((struct va_format *)ptr)->va); | |
1088 | buf += vsnprintf(buf, end > buf ? end - buf : 0, | |
1089 | ((struct va_format *)ptr)->fmt, va); | |
1090 | va_end(va); | |
1091 | return buf; | |
1092 | } | |
1093 | case 'K': | |
1094 | /* | |
1095 | * %pK cannot be used in IRQ context because its test | |
1096 | * for CAP_SYSLOG would be meaningless. | |
1097 | */ | |
1098 | if (kptr_restrict && (in_irq() || in_serving_softirq() || | |
1099 | in_nmi())) { | |
1100 | if (spec.field_width == -1) | |
1101 | spec.field_width = default_width; | |
1102 | return string(buf, end, "pK-error", spec); | |
1103 | } | |
1104 | if (!((kptr_restrict == 0) || | |
1105 | (kptr_restrict == 1 && | |
1106 | has_capability_noaudit(current, CAP_SYSLOG)))) | |
1107 | ptr = NULL; | |
1108 | break; | |
1109 | case 'N': | |
1110 | switch (fmt[1]) { | |
1111 | case 'F': | |
1112 | return netdev_feature_string(buf, end, ptr, spec); | |
1113 | } | |
1114 | break; | |
1115 | } | |
1116 | spec.flags |= SMALL; | |
1117 | if (spec.field_width == -1) { | |
1118 | spec.field_width = default_width; | |
1119 | spec.flags |= ZEROPAD; | |
1120 | } | |
1121 | spec.base = 16; | |
1122 | ||
1123 | return number(buf, end, (unsigned long) ptr, spec); | |
1124 | } | |
1125 | ||
1126 | /* | |
1127 | * Helper function to decode printf style format. | |
1128 | * Each call decode a token from the format and return the | |
1129 | * number of characters read (or likely the delta where it wants | |
1130 | * to go on the next call). | |
1131 | * The decoded token is returned through the parameters | |
1132 | * | |
1133 | * 'h', 'l', or 'L' for integer fields | |
1134 | * 'z' support added 23/7/1999 S.H. | |
1135 | * 'z' changed to 'Z' --davidm 1/25/99 | |
1136 | * 't' added for ptrdiff_t | |
1137 | * | |
1138 | * @fmt: the format string | |
1139 | * @type of the token returned | |
1140 | * @flags: various flags such as +, -, # tokens.. | |
1141 | * @field_width: overwritten width | |
1142 | * @base: base of the number (octal, hex, ...) | |
1143 | * @precision: precision of a number | |
1144 | * @qualifier: qualifier of a number (long, size_t, ...) | |
1145 | */ | |
1146 | static noinline_for_stack | |
1147 | int format_decode(const char *fmt, struct printf_spec *spec) | |
1148 | { | |
1149 | const char *start = fmt; | |
1150 | ||
1151 | /* we finished early by reading the field width */ | |
1152 | if (spec->type == FORMAT_TYPE_WIDTH) { | |
1153 | if (spec->field_width < 0) { | |
1154 | spec->field_width = -spec->field_width; | |
1155 | spec->flags |= LEFT; | |
1156 | } | |
1157 | spec->type = FORMAT_TYPE_NONE; | |
1158 | goto precision; | |
1159 | } | |
1160 | ||
1161 | /* we finished early by reading the precision */ | |
1162 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
1163 | if (spec->precision < 0) | |
1164 | spec->precision = 0; | |
1165 | ||
1166 | spec->type = FORMAT_TYPE_NONE; | |
1167 | goto qualifier; | |
1168 | } | |
1169 | ||
1170 | /* By default */ | |
1171 | spec->type = FORMAT_TYPE_NONE; | |
1172 | ||
1173 | for (; *fmt ; ++fmt) { | |
1174 | if (*fmt == '%') | |
1175 | break; | |
1176 | } | |
1177 | ||
1178 | /* Return the current non-format string */ | |
1179 | if (fmt != start || !*fmt) | |
1180 | return fmt - start; | |
1181 | ||
1182 | /* Process flags */ | |
1183 | spec->flags = 0; | |
1184 | ||
1185 | while (1) { /* this also skips first '%' */ | |
1186 | bool found = true; | |
1187 | ||
1188 | ++fmt; | |
1189 | ||
1190 | switch (*fmt) { | |
1191 | case '-': spec->flags |= LEFT; break; | |
1192 | case '+': spec->flags |= PLUS; break; | |
1193 | case ' ': spec->flags |= SPACE; break; | |
1194 | case '#': spec->flags |= SPECIAL; break; | |
1195 | case '0': spec->flags |= ZEROPAD; break; | |
1196 | default: found = false; | |
1197 | } | |
1198 | ||
1199 | if (!found) | |
1200 | break; | |
1201 | } | |
1202 | ||
1203 | /* get field width */ | |
1204 | spec->field_width = -1; | |
1205 | ||
1206 | if (isdigit(*fmt)) | |
1207 | spec->field_width = skip_atoi(&fmt); | |
1208 | else if (*fmt == '*') { | |
1209 | /* it's the next argument */ | |
1210 | spec->type = FORMAT_TYPE_WIDTH; | |
1211 | return ++fmt - start; | |
1212 | } | |
1213 | ||
1214 | precision: | |
1215 | /* get the precision */ | |
1216 | spec->precision = -1; | |
1217 | if (*fmt == '.') { | |
1218 | ++fmt; | |
1219 | if (isdigit(*fmt)) { | |
1220 | spec->precision = skip_atoi(&fmt); | |
1221 | if (spec->precision < 0) | |
1222 | spec->precision = 0; | |
1223 | } else if (*fmt == '*') { | |
1224 | /* it's the next argument */ | |
1225 | spec->type = FORMAT_TYPE_PRECISION; | |
1226 | return ++fmt - start; | |
1227 | } | |
1228 | } | |
1229 | ||
1230 | qualifier: | |
1231 | /* get the conversion qualifier */ | |
1232 | spec->qualifier = -1; | |
1233 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || | |
1234 | _tolower(*fmt) == 'z' || *fmt == 't') { | |
1235 | spec->qualifier = *fmt++; | |
1236 | if (unlikely(spec->qualifier == *fmt)) { | |
1237 | if (spec->qualifier == 'l') { | |
1238 | spec->qualifier = 'L'; | |
1239 | ++fmt; | |
1240 | } else if (spec->qualifier == 'h') { | |
1241 | spec->qualifier = 'H'; | |
1242 | ++fmt; | |
1243 | } | |
1244 | } | |
1245 | } | |
1246 | ||
1247 | /* default base */ | |
1248 | spec->base = 10; | |
1249 | switch (*fmt) { | |
1250 | case 'c': | |
1251 | spec->type = FORMAT_TYPE_CHAR; | |
1252 | return ++fmt - start; | |
1253 | ||
1254 | case 's': | |
1255 | spec->type = FORMAT_TYPE_STR; | |
1256 | return ++fmt - start; | |
1257 | ||
1258 | case 'p': | |
1259 | spec->type = FORMAT_TYPE_PTR; | |
1260 | return fmt - start; | |
1261 | /* skip alnum */ | |
1262 | ||
1263 | case 'n': | |
1264 | spec->type = FORMAT_TYPE_NRCHARS; | |
1265 | return ++fmt - start; | |
1266 | ||
1267 | case '%': | |
1268 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
1269 | return ++fmt - start; | |
1270 | ||
1271 | /* integer number formats - set up the flags and "break" */ | |
1272 | case 'o': | |
1273 | spec->base = 8; | |
1274 | break; | |
1275 | ||
1276 | case 'x': | |
1277 | spec->flags |= SMALL; | |
1278 | ||
1279 | case 'X': | |
1280 | spec->base = 16; | |
1281 | break; | |
1282 | ||
1283 | case 'd': | |
1284 | case 'i': | |
1285 | spec->flags |= SIGN; | |
1286 | case 'u': | |
1287 | break; | |
1288 | ||
1289 | default: | |
1290 | spec->type = FORMAT_TYPE_INVALID; | |
1291 | return fmt - start; | |
1292 | } | |
1293 | ||
1294 | if (spec->qualifier == 'L') | |
1295 | spec->type = FORMAT_TYPE_LONG_LONG; | |
1296 | else if (spec->qualifier == 'l') { | |
1297 | if (spec->flags & SIGN) | |
1298 | spec->type = FORMAT_TYPE_LONG; | |
1299 | else | |
1300 | spec->type = FORMAT_TYPE_ULONG; | |
1301 | } else if (_tolower(spec->qualifier) == 'z') { | |
1302 | spec->type = FORMAT_TYPE_SIZE_T; | |
1303 | } else if (spec->qualifier == 't') { | |
1304 | spec->type = FORMAT_TYPE_PTRDIFF; | |
1305 | } else if (spec->qualifier == 'H') { | |
1306 | if (spec->flags & SIGN) | |
1307 | spec->type = FORMAT_TYPE_BYTE; | |
1308 | else | |
1309 | spec->type = FORMAT_TYPE_UBYTE; | |
1310 | } else if (spec->qualifier == 'h') { | |
1311 | if (spec->flags & SIGN) | |
1312 | spec->type = FORMAT_TYPE_SHORT; | |
1313 | else | |
1314 | spec->type = FORMAT_TYPE_USHORT; | |
1315 | } else { | |
1316 | if (spec->flags & SIGN) | |
1317 | spec->type = FORMAT_TYPE_INT; | |
1318 | else | |
1319 | spec->type = FORMAT_TYPE_UINT; | |
1320 | } | |
1321 | ||
1322 | return ++fmt - start; | |
1323 | } | |
1324 | ||
1325 | /** | |
1326 | * vsnprintf - Format a string and place it in a buffer | |
1327 | * @buf: The buffer to place the result into | |
1328 | * @size: The size of the buffer, including the trailing null space | |
1329 | * @fmt: The format string to use | |
1330 | * @args: Arguments for the format string | |
1331 | * | |
1332 | * This function follows C99 vsnprintf, but has some extensions: | |
1333 | * %pS output the name of a text symbol with offset | |
1334 | * %ps output the name of a text symbol without offset | |
1335 | * %pF output the name of a function pointer with its offset | |
1336 | * %pf output the name of a function pointer without its offset | |
1337 | * %pB output the name of a backtrace symbol with its offset | |
1338 | * %pR output the address range in a struct resource with decoded flags | |
1339 | * %pr output the address range in a struct resource with raw flags | |
1340 | * %pM output a 6-byte MAC address with colons | |
1341 | * %pMR output a 6-byte MAC address with colons in reversed order | |
1342 | * %pMF output a 6-byte MAC address with dashes | |
1343 | * %pm output a 6-byte MAC address without colons | |
1344 | * %pmR output a 6-byte MAC address without colons in reversed order | |
1345 | * %pI4 print an IPv4 address without leading zeros | |
1346 | * %pi4 print an IPv4 address with leading zeros | |
1347 | * %pI6 print an IPv6 address with colons | |
1348 | * %pi6 print an IPv6 address without colons | |
1349 | * %pI6c print an IPv6 address as specified by RFC 5952 | |
1350 | * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper | |
1351 | * case. | |
1352 | * %*ph[CDN] a variable-length hex string with a separator (supports up to 64 | |
1353 | * bytes of the input) | |
1354 | * %n is ignored | |
1355 | * | |
1356 | * ** Please update Documentation/printk-formats.txt when making changes ** | |
1357 | * | |
1358 | * The return value is the number of characters which would | |
1359 | * be generated for the given input, excluding the trailing | |
1360 | * '\0', as per ISO C99. If you want to have the exact | |
1361 | * number of characters written into @buf as return value | |
1362 | * (not including the trailing '\0'), use vscnprintf(). If the | |
1363 | * return is greater than or equal to @size, the resulting | |
1364 | * string is truncated. | |
1365 | * | |
1366 | * If you're not already dealing with a va_list consider using snprintf(). | |
1367 | */ | |
1368 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1369 | { | |
1370 | unsigned long long num; | |
1371 | char *str, *end; | |
1372 | struct printf_spec spec = {0}; | |
1373 | ||
1374 | /* Reject out-of-range values early. Large positive sizes are | |
1375 | used for unknown buffer sizes. */ | |
1376 | if (WARN_ON_ONCE((int) size < 0)) | |
1377 | return 0; | |
1378 | ||
1379 | str = buf; | |
1380 | end = buf + size; | |
1381 | ||
1382 | /* Make sure end is always >= buf */ | |
1383 | if (end < buf) { | |
1384 | end = ((void *)-1); | |
1385 | size = end - buf; | |
1386 | } | |
1387 | ||
1388 | while (*fmt) { | |
1389 | const char *old_fmt = fmt; | |
1390 | int read = format_decode(fmt, &spec); | |
1391 | ||
1392 | fmt += read; | |
1393 | ||
1394 | switch (spec.type) { | |
1395 | case FORMAT_TYPE_NONE: { | |
1396 | int copy = read; | |
1397 | if (str < end) { | |
1398 | if (copy > end - str) | |
1399 | copy = end - str; | |
1400 | memcpy(str, old_fmt, copy); | |
1401 | } | |
1402 | str += read; | |
1403 | break; | |
1404 | } | |
1405 | ||
1406 | case FORMAT_TYPE_WIDTH: | |
1407 | spec.field_width = va_arg(args, int); | |
1408 | break; | |
1409 | ||
1410 | case FORMAT_TYPE_PRECISION: | |
1411 | spec.precision = va_arg(args, int); | |
1412 | break; | |
1413 | ||
1414 | case FORMAT_TYPE_CHAR: { | |
1415 | char c; | |
1416 | ||
1417 | if (!(spec.flags & LEFT)) { | |
1418 | while (--spec.field_width > 0) { | |
1419 | if (str < end) | |
1420 | *str = ' '; | |
1421 | ++str; | |
1422 | ||
1423 | } | |
1424 | } | |
1425 | c = (unsigned char) va_arg(args, int); | |
1426 | if (str < end) | |
1427 | *str = c; | |
1428 | ++str; | |
1429 | while (--spec.field_width > 0) { | |
1430 | if (str < end) | |
1431 | *str = ' '; | |
1432 | ++str; | |
1433 | } | |
1434 | break; | |
1435 | } | |
1436 | ||
1437 | case FORMAT_TYPE_STR: | |
1438 | str = string(str, end, va_arg(args, char *), spec); | |
1439 | break; | |
1440 | ||
1441 | case FORMAT_TYPE_PTR: | |
1442 | str = pointer(fmt+1, str, end, va_arg(args, void *), | |
1443 | spec); | |
1444 | while (isalnum(*fmt)) | |
1445 | fmt++; | |
1446 | break; | |
1447 | ||
1448 | case FORMAT_TYPE_PERCENT_CHAR: | |
1449 | if (str < end) | |
1450 | *str = '%'; | |
1451 | ++str; | |
1452 | break; | |
1453 | ||
1454 | case FORMAT_TYPE_INVALID: | |
1455 | if (str < end) | |
1456 | *str = '%'; | |
1457 | ++str; | |
1458 | break; | |
1459 | ||
1460 | case FORMAT_TYPE_NRCHARS: { | |
1461 | u8 qualifier = spec.qualifier; | |
1462 | ||
1463 | if (qualifier == 'l') { | |
1464 | long *ip = va_arg(args, long *); | |
1465 | *ip = (str - buf); | |
1466 | } else if (_tolower(qualifier) == 'z') { | |
1467 | size_t *ip = va_arg(args, size_t *); | |
1468 | *ip = (str - buf); | |
1469 | } else { | |
1470 | int *ip = va_arg(args, int *); | |
1471 | *ip = (str - buf); | |
1472 | } | |
1473 | break; | |
1474 | } | |
1475 | ||
1476 | default: | |
1477 | switch (spec.type) { | |
1478 | case FORMAT_TYPE_LONG_LONG: | |
1479 | num = va_arg(args, long long); | |
1480 | break; | |
1481 | case FORMAT_TYPE_ULONG: | |
1482 | num = va_arg(args, unsigned long); | |
1483 | break; | |
1484 | case FORMAT_TYPE_LONG: | |
1485 | num = va_arg(args, long); | |
1486 | break; | |
1487 | case FORMAT_TYPE_SIZE_T: | |
1488 | num = va_arg(args, size_t); | |
1489 | break; | |
1490 | case FORMAT_TYPE_PTRDIFF: | |
1491 | num = va_arg(args, ptrdiff_t); | |
1492 | break; | |
1493 | case FORMAT_TYPE_UBYTE: | |
1494 | num = (unsigned char) va_arg(args, int); | |
1495 | break; | |
1496 | case FORMAT_TYPE_BYTE: | |
1497 | num = (signed char) va_arg(args, int); | |
1498 | break; | |
1499 | case FORMAT_TYPE_USHORT: | |
1500 | num = (unsigned short) va_arg(args, int); | |
1501 | break; | |
1502 | case FORMAT_TYPE_SHORT: | |
1503 | num = (short) va_arg(args, int); | |
1504 | break; | |
1505 | case FORMAT_TYPE_INT: | |
1506 | num = (int) va_arg(args, int); | |
1507 | break; | |
1508 | default: | |
1509 | num = va_arg(args, unsigned int); | |
1510 | } | |
1511 | ||
1512 | str = number(str, end, num, spec); | |
1513 | } | |
1514 | } | |
1515 | ||
1516 | if (size > 0) { | |
1517 | if (str < end) | |
1518 | *str = '\0'; | |
1519 | else | |
1520 | end[-1] = '\0'; | |
1521 | } | |
1522 | ||
1523 | /* the trailing null byte doesn't count towards the total */ | |
1524 | return str-buf; | |
1525 | ||
1526 | } | |
1527 | EXPORT_SYMBOL(vsnprintf); | |
1528 | ||
1529 | /** | |
1530 | * vscnprintf - Format a string and place it in a buffer | |
1531 | * @buf: The buffer to place the result into | |
1532 | * @size: The size of the buffer, including the trailing null space | |
1533 | * @fmt: The format string to use | |
1534 | * @args: Arguments for the format string | |
1535 | * | |
1536 | * The return value is the number of characters which have been written into | |
1537 | * the @buf not including the trailing '\0'. If @size is == 0 the function | |
1538 | * returns 0. | |
1539 | * | |
1540 | * If you're not already dealing with a va_list consider using scnprintf(). | |
1541 | * | |
1542 | * See the vsnprintf() documentation for format string extensions over C99. | |
1543 | */ | |
1544 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1545 | { | |
1546 | int i; | |
1547 | ||
1548 | i = vsnprintf(buf, size, fmt, args); | |
1549 | ||
1550 | if (likely(i < size)) | |
1551 | return i; | |
1552 | if (size != 0) | |
1553 | return size - 1; | |
1554 | return 0; | |
1555 | } | |
1556 | EXPORT_SYMBOL(vscnprintf); | |
1557 | ||
1558 | /** | |
1559 | * snprintf - Format a string and place it in a buffer | |
1560 | * @buf: The buffer to place the result into | |
1561 | * @size: The size of the buffer, including the trailing null space | |
1562 | * @fmt: The format string to use | |
1563 | * @...: Arguments for the format string | |
1564 | * | |
1565 | * The return value is the number of characters which would be | |
1566 | * generated for the given input, excluding the trailing null, | |
1567 | * as per ISO C99. If the return is greater than or equal to | |
1568 | * @size, the resulting string is truncated. | |
1569 | * | |
1570 | * See the vsnprintf() documentation for format string extensions over C99. | |
1571 | */ | |
1572 | int snprintf(char *buf, size_t size, const char *fmt, ...) | |
1573 | { | |
1574 | va_list args; | |
1575 | int i; | |
1576 | ||
1577 | va_start(args, fmt); | |
1578 | i = vsnprintf(buf, size, fmt, args); | |
1579 | va_end(args); | |
1580 | ||
1581 | return i; | |
1582 | } | |
1583 | EXPORT_SYMBOL(snprintf); | |
1584 | ||
1585 | /** | |
1586 | * scnprintf - Format a string and place it in a buffer | |
1587 | * @buf: The buffer to place the result into | |
1588 | * @size: The size of the buffer, including the trailing null space | |
1589 | * @fmt: The format string to use | |
1590 | * @...: Arguments for the format string | |
1591 | * | |
1592 | * The return value is the number of characters written into @buf not including | |
1593 | * the trailing '\0'. If @size is == 0 the function returns 0. | |
1594 | */ | |
1595 | ||
1596 | int scnprintf(char *buf, size_t size, const char *fmt, ...) | |
1597 | { | |
1598 | va_list args; | |
1599 | int i; | |
1600 | ||
1601 | va_start(args, fmt); | |
1602 | i = vscnprintf(buf, size, fmt, args); | |
1603 | va_end(args); | |
1604 | ||
1605 | return i; | |
1606 | } | |
1607 | EXPORT_SYMBOL(scnprintf); | |
1608 | ||
1609 | /** | |
1610 | * vsprintf - Format a string and place it in a buffer | |
1611 | * @buf: The buffer to place the result into | |
1612 | * @fmt: The format string to use | |
1613 | * @args: Arguments for the format string | |
1614 | * | |
1615 | * The function returns the number of characters written | |
1616 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid | |
1617 | * buffer overflows. | |
1618 | * | |
1619 | * If you're not already dealing with a va_list consider using sprintf(). | |
1620 | * | |
1621 | * See the vsnprintf() documentation for format string extensions over C99. | |
1622 | */ | |
1623 | int vsprintf(char *buf, const char *fmt, va_list args) | |
1624 | { | |
1625 | return vsnprintf(buf, INT_MAX, fmt, args); | |
1626 | } | |
1627 | EXPORT_SYMBOL(vsprintf); | |
1628 | ||
1629 | /** | |
1630 | * sprintf - Format a string and place it in a buffer | |
1631 | * @buf: The buffer to place the result into | |
1632 | * @fmt: The format string to use | |
1633 | * @...: Arguments for the format string | |
1634 | * | |
1635 | * The function returns the number of characters written | |
1636 | * into @buf. Use snprintf() or scnprintf() in order to avoid | |
1637 | * buffer overflows. | |
1638 | * | |
1639 | * See the vsnprintf() documentation for format string extensions over C99. | |
1640 | */ | |
1641 | int sprintf(char *buf, const char *fmt, ...) | |
1642 | { | |
1643 | va_list args; | |
1644 | int i; | |
1645 | ||
1646 | va_start(args, fmt); | |
1647 | i = vsnprintf(buf, INT_MAX, fmt, args); | |
1648 | va_end(args); | |
1649 | ||
1650 | return i; | |
1651 | } | |
1652 | EXPORT_SYMBOL(sprintf); | |
1653 | ||
1654 | #ifdef CONFIG_BINARY_PRINTF | |
1655 | /* | |
1656 | * bprintf service: | |
1657 | * vbin_printf() - VA arguments to binary data | |
1658 | * bstr_printf() - Binary data to text string | |
1659 | */ | |
1660 | ||
1661 | /** | |
1662 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
1663 | * @bin_buf: The buffer to place args' binary value | |
1664 | * @size: The size of the buffer(by words(32bits), not characters) | |
1665 | * @fmt: The format string to use | |
1666 | * @args: Arguments for the format string | |
1667 | * | |
1668 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
1669 | * is skiped. | |
1670 | * | |
1671 | * The return value is the number of words(32bits) which would be generated for | |
1672 | * the given input. | |
1673 | * | |
1674 | * NOTE: | |
1675 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
1676 | * valid for bstr_printf(). | |
1677 | */ | |
1678 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
1679 | { | |
1680 | struct printf_spec spec = {0}; | |
1681 | char *str, *end; | |
1682 | ||
1683 | str = (char *)bin_buf; | |
1684 | end = (char *)(bin_buf + size); | |
1685 | ||
1686 | #define save_arg(type) \ | |
1687 | do { \ | |
1688 | if (sizeof(type) == 8) { \ | |
1689 | unsigned long long value; \ | |
1690 | str = PTR_ALIGN(str, sizeof(u32)); \ | |
1691 | value = va_arg(args, unsigned long long); \ | |
1692 | if (str + sizeof(type) <= end) { \ | |
1693 | *(u32 *)str = *(u32 *)&value; \ | |
1694 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ | |
1695 | } \ | |
1696 | } else { \ | |
1697 | unsigned long value; \ | |
1698 | str = PTR_ALIGN(str, sizeof(type)); \ | |
1699 | value = va_arg(args, int); \ | |
1700 | if (str + sizeof(type) <= end) \ | |
1701 | *(typeof(type) *)str = (type)value; \ | |
1702 | } \ | |
1703 | str += sizeof(type); \ | |
1704 | } while (0) | |
1705 | ||
1706 | while (*fmt) { | |
1707 | int read = format_decode(fmt, &spec); | |
1708 | ||
1709 | fmt += read; | |
1710 | ||
1711 | switch (spec.type) { | |
1712 | case FORMAT_TYPE_NONE: | |
1713 | case FORMAT_TYPE_INVALID: | |
1714 | case FORMAT_TYPE_PERCENT_CHAR: | |
1715 | break; | |
1716 | ||
1717 | case FORMAT_TYPE_WIDTH: | |
1718 | case FORMAT_TYPE_PRECISION: | |
1719 | save_arg(int); | |
1720 | break; | |
1721 | ||
1722 | case FORMAT_TYPE_CHAR: | |
1723 | save_arg(char); | |
1724 | break; | |
1725 | ||
1726 | case FORMAT_TYPE_STR: { | |
1727 | const char *save_str = va_arg(args, char *); | |
1728 | size_t len; | |
1729 | ||
1730 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE | |
1731 | || (unsigned long)save_str < PAGE_SIZE) | |
1732 | save_str = "(null)"; | |
1733 | len = strlen(save_str) + 1; | |
1734 | if (str + len < end) | |
1735 | memcpy(str, save_str, len); | |
1736 | str += len; | |
1737 | break; | |
1738 | } | |
1739 | ||
1740 | case FORMAT_TYPE_PTR: | |
1741 | save_arg(void *); | |
1742 | /* skip all alphanumeric pointer suffixes */ | |
1743 | while (isalnum(*fmt)) | |
1744 | fmt++; | |
1745 | break; | |
1746 | ||
1747 | case FORMAT_TYPE_NRCHARS: { | |
1748 | /* skip %n 's argument */ | |
1749 | u8 qualifier = spec.qualifier; | |
1750 | void *skip_arg; | |
1751 | if (qualifier == 'l') | |
1752 | skip_arg = va_arg(args, long *); | |
1753 | else if (_tolower(qualifier) == 'z') | |
1754 | skip_arg = va_arg(args, size_t *); | |
1755 | else | |
1756 | skip_arg = va_arg(args, int *); | |
1757 | break; | |
1758 | } | |
1759 | ||
1760 | default: | |
1761 | switch (spec.type) { | |
1762 | ||
1763 | case FORMAT_TYPE_LONG_LONG: | |
1764 | save_arg(long long); | |
1765 | break; | |
1766 | case FORMAT_TYPE_ULONG: | |
1767 | case FORMAT_TYPE_LONG: | |
1768 | save_arg(unsigned long); | |
1769 | break; | |
1770 | case FORMAT_TYPE_SIZE_T: | |
1771 | save_arg(size_t); | |
1772 | break; | |
1773 | case FORMAT_TYPE_PTRDIFF: | |
1774 | save_arg(ptrdiff_t); | |
1775 | break; | |
1776 | case FORMAT_TYPE_UBYTE: | |
1777 | case FORMAT_TYPE_BYTE: | |
1778 | save_arg(char); | |
1779 | break; | |
1780 | case FORMAT_TYPE_USHORT: | |
1781 | case FORMAT_TYPE_SHORT: | |
1782 | save_arg(short); | |
1783 | break; | |
1784 | default: | |
1785 | save_arg(int); | |
1786 | } | |
1787 | } | |
1788 | } | |
1789 | ||
1790 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; | |
1791 | #undef save_arg | |
1792 | } | |
1793 | EXPORT_SYMBOL_GPL(vbin_printf); | |
1794 | ||
1795 | /** | |
1796 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
1797 | * @buf: The buffer to place the result into | |
1798 | * @size: The size of the buffer, including the trailing null space | |
1799 | * @fmt: The format string to use | |
1800 | * @bin_buf: Binary arguments for the format string | |
1801 | * | |
1802 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
1803 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
1804 | * a binary buffer that generated by vbin_printf. | |
1805 | * | |
1806 | * The format follows C99 vsnprintf, but has some extensions: | |
1807 | * see vsnprintf comment for details. | |
1808 | * | |
1809 | * The return value is the number of characters which would | |
1810 | * be generated for the given input, excluding the trailing | |
1811 | * '\0', as per ISO C99. If you want to have the exact | |
1812 | * number of characters written into @buf as return value | |
1813 | * (not including the trailing '\0'), use vscnprintf(). If the | |
1814 | * return is greater than or equal to @size, the resulting | |
1815 | * string is truncated. | |
1816 | */ | |
1817 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
1818 | { | |
1819 | struct printf_spec spec = {0}; | |
1820 | char *str, *end; | |
1821 | const char *args = (const char *)bin_buf; | |
1822 | ||
1823 | if (WARN_ON_ONCE((int) size < 0)) | |
1824 | return 0; | |
1825 | ||
1826 | str = buf; | |
1827 | end = buf + size; | |
1828 | ||
1829 | #define get_arg(type) \ | |
1830 | ({ \ | |
1831 | typeof(type) value; \ | |
1832 | if (sizeof(type) == 8) { \ | |
1833 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
1834 | *(u32 *)&value = *(u32 *)args; \ | |
1835 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
1836 | } else { \ | |
1837 | args = PTR_ALIGN(args, sizeof(type)); \ | |
1838 | value = *(typeof(type) *)args; \ | |
1839 | } \ | |
1840 | args += sizeof(type); \ | |
1841 | value; \ | |
1842 | }) | |
1843 | ||
1844 | /* Make sure end is always >= buf */ | |
1845 | if (end < buf) { | |
1846 | end = ((void *)-1); | |
1847 | size = end - buf; | |
1848 | } | |
1849 | ||
1850 | while (*fmt) { | |
1851 | const char *old_fmt = fmt; | |
1852 | int read = format_decode(fmt, &spec); | |
1853 | ||
1854 | fmt += read; | |
1855 | ||
1856 | switch (spec.type) { | |
1857 | case FORMAT_TYPE_NONE: { | |
1858 | int copy = read; | |
1859 | if (str < end) { | |
1860 | if (copy > end - str) | |
1861 | copy = end - str; | |
1862 | memcpy(str, old_fmt, copy); | |
1863 | } | |
1864 | str += read; | |
1865 | break; | |
1866 | } | |
1867 | ||
1868 | case FORMAT_TYPE_WIDTH: | |
1869 | spec.field_width = get_arg(int); | |
1870 | break; | |
1871 | ||
1872 | case FORMAT_TYPE_PRECISION: | |
1873 | spec.precision = get_arg(int); | |
1874 | break; | |
1875 | ||
1876 | case FORMAT_TYPE_CHAR: { | |
1877 | char c; | |
1878 | ||
1879 | if (!(spec.flags & LEFT)) { | |
1880 | while (--spec.field_width > 0) { | |
1881 | if (str < end) | |
1882 | *str = ' '; | |
1883 | ++str; | |
1884 | } | |
1885 | } | |
1886 | c = (unsigned char) get_arg(char); | |
1887 | if (str < end) | |
1888 | *str = c; | |
1889 | ++str; | |
1890 | while (--spec.field_width > 0) { | |
1891 | if (str < end) | |
1892 | *str = ' '; | |
1893 | ++str; | |
1894 | } | |
1895 | break; | |
1896 | } | |
1897 | ||
1898 | case FORMAT_TYPE_STR: { | |
1899 | const char *str_arg = args; | |
1900 | args += strlen(str_arg) + 1; | |
1901 | str = string(str, end, (char *)str_arg, spec); | |
1902 | break; | |
1903 | } | |
1904 | ||
1905 | case FORMAT_TYPE_PTR: | |
1906 | str = pointer(fmt+1, str, end, get_arg(void *), spec); | |
1907 | while (isalnum(*fmt)) | |
1908 | fmt++; | |
1909 | break; | |
1910 | ||
1911 | case FORMAT_TYPE_PERCENT_CHAR: | |
1912 | case FORMAT_TYPE_INVALID: | |
1913 | if (str < end) | |
1914 | *str = '%'; | |
1915 | ++str; | |
1916 | break; | |
1917 | ||
1918 | case FORMAT_TYPE_NRCHARS: | |
1919 | /* skip */ | |
1920 | break; | |
1921 | ||
1922 | default: { | |
1923 | unsigned long long num; | |
1924 | ||
1925 | switch (spec.type) { | |
1926 | ||
1927 | case FORMAT_TYPE_LONG_LONG: | |
1928 | num = get_arg(long long); | |
1929 | break; | |
1930 | case FORMAT_TYPE_ULONG: | |
1931 | case FORMAT_TYPE_LONG: | |
1932 | num = get_arg(unsigned long); | |
1933 | break; | |
1934 | case FORMAT_TYPE_SIZE_T: | |
1935 | num = get_arg(size_t); | |
1936 | break; | |
1937 | case FORMAT_TYPE_PTRDIFF: | |
1938 | num = get_arg(ptrdiff_t); | |
1939 | break; | |
1940 | case FORMAT_TYPE_UBYTE: | |
1941 | num = get_arg(unsigned char); | |
1942 | break; | |
1943 | case FORMAT_TYPE_BYTE: | |
1944 | num = get_arg(signed char); | |
1945 | break; | |
1946 | case FORMAT_TYPE_USHORT: | |
1947 | num = get_arg(unsigned short); | |
1948 | break; | |
1949 | case FORMAT_TYPE_SHORT: | |
1950 | num = get_arg(short); | |
1951 | break; | |
1952 | case FORMAT_TYPE_UINT: | |
1953 | num = get_arg(unsigned int); | |
1954 | break; | |
1955 | default: | |
1956 | num = get_arg(int); | |
1957 | } | |
1958 | ||
1959 | str = number(str, end, num, spec); | |
1960 | } /* default: */ | |
1961 | } /* switch(spec.type) */ | |
1962 | } /* while(*fmt) */ | |
1963 | ||
1964 | if (size > 0) { | |
1965 | if (str < end) | |
1966 | *str = '\0'; | |
1967 | else | |
1968 | end[-1] = '\0'; | |
1969 | } | |
1970 | ||
1971 | #undef get_arg | |
1972 | ||
1973 | /* the trailing null byte doesn't count towards the total */ | |
1974 | return str - buf; | |
1975 | } | |
1976 | EXPORT_SYMBOL_GPL(bstr_printf); | |
1977 | ||
1978 | /** | |
1979 | * bprintf - Parse a format string and place args' binary value in a buffer | |
1980 | * @bin_buf: The buffer to place args' binary value | |
1981 | * @size: The size of the buffer(by words(32bits), not characters) | |
1982 | * @fmt: The format string to use | |
1983 | * @...: Arguments for the format string | |
1984 | * | |
1985 | * The function returns the number of words(u32) written | |
1986 | * into @bin_buf. | |
1987 | */ | |
1988 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
1989 | { | |
1990 | va_list args; | |
1991 | int ret; | |
1992 | ||
1993 | va_start(args, fmt); | |
1994 | ret = vbin_printf(bin_buf, size, fmt, args); | |
1995 | va_end(args); | |
1996 | ||
1997 | return ret; | |
1998 | } | |
1999 | EXPORT_SYMBOL_GPL(bprintf); | |
2000 | ||
2001 | #endif /* CONFIG_BINARY_PRINTF */ | |
2002 | ||
2003 | /** | |
2004 | * vsscanf - Unformat a buffer into a list of arguments | |
2005 | * @buf: input buffer | |
2006 | * @fmt: format of buffer | |
2007 | * @args: arguments | |
2008 | */ | |
2009 | int vsscanf(const char *buf, const char *fmt, va_list args) | |
2010 | { | |
2011 | const char *str = buf; | |
2012 | char *next; | |
2013 | char digit; | |
2014 | int num = 0; | |
2015 | u8 qualifier; | |
2016 | u8 base; | |
2017 | s16 field_width; | |
2018 | bool is_sign; | |
2019 | ||
2020 | while (*fmt && *str) { | |
2021 | /* skip any white space in format */ | |
2022 | /* white space in format matchs any amount of | |
2023 | * white space, including none, in the input. | |
2024 | */ | |
2025 | if (isspace(*fmt)) { | |
2026 | fmt = skip_spaces(++fmt); | |
2027 | str = skip_spaces(str); | |
2028 | } | |
2029 | ||
2030 | /* anything that is not a conversion must match exactly */ | |
2031 | if (*fmt != '%' && *fmt) { | |
2032 | if (*fmt++ != *str++) | |
2033 | break; | |
2034 | continue; | |
2035 | } | |
2036 | ||
2037 | if (!*fmt) | |
2038 | break; | |
2039 | ++fmt; | |
2040 | ||
2041 | /* skip this conversion. | |
2042 | * advance both strings to next white space | |
2043 | */ | |
2044 | if (*fmt == '*') { | |
2045 | while (!isspace(*fmt) && *fmt != '%' && *fmt) | |
2046 | fmt++; | |
2047 | while (!isspace(*str) && *str) | |
2048 | str++; | |
2049 | continue; | |
2050 | } | |
2051 | ||
2052 | /* get field width */ | |
2053 | field_width = -1; | |
2054 | if (isdigit(*fmt)) | |
2055 | field_width = skip_atoi(&fmt); | |
2056 | ||
2057 | /* get conversion qualifier */ | |
2058 | qualifier = -1; | |
2059 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || | |
2060 | _tolower(*fmt) == 'z') { | |
2061 | qualifier = *fmt++; | |
2062 | if (unlikely(qualifier == *fmt)) { | |
2063 | if (qualifier == 'h') { | |
2064 | qualifier = 'H'; | |
2065 | fmt++; | |
2066 | } else if (qualifier == 'l') { | |
2067 | qualifier = 'L'; | |
2068 | fmt++; | |
2069 | } | |
2070 | } | |
2071 | } | |
2072 | ||
2073 | if (!*fmt || !*str) | |
2074 | break; | |
2075 | ||
2076 | base = 10; | |
2077 | is_sign = 0; | |
2078 | ||
2079 | switch (*fmt++) { | |
2080 | case 'c': | |
2081 | { | |
2082 | char *s = (char *)va_arg(args, char*); | |
2083 | if (field_width == -1) | |
2084 | field_width = 1; | |
2085 | do { | |
2086 | *s++ = *str++; | |
2087 | } while (--field_width > 0 && *str); | |
2088 | num++; | |
2089 | } | |
2090 | continue; | |
2091 | case 's': | |
2092 | { | |
2093 | char *s = (char *)va_arg(args, char *); | |
2094 | if (field_width == -1) | |
2095 | field_width = SHRT_MAX; | |
2096 | /* first, skip leading white space in buffer */ | |
2097 | str = skip_spaces(str); | |
2098 | ||
2099 | /* now copy until next white space */ | |
2100 | while (*str && !isspace(*str) && field_width--) | |
2101 | *s++ = *str++; | |
2102 | *s = '\0'; | |
2103 | num++; | |
2104 | } | |
2105 | continue; | |
2106 | case 'n': | |
2107 | /* return number of characters read so far */ | |
2108 | { | |
2109 | int *i = (int *)va_arg(args, int*); | |
2110 | *i = str - buf; | |
2111 | } | |
2112 | continue; | |
2113 | case 'o': | |
2114 | base = 8; | |
2115 | break; | |
2116 | case 'x': | |
2117 | case 'X': | |
2118 | base = 16; | |
2119 | break; | |
2120 | case 'i': | |
2121 | base = 0; | |
2122 | case 'd': | |
2123 | is_sign = 1; | |
2124 | case 'u': | |
2125 | break; | |
2126 | case '%': | |
2127 | /* looking for '%' in str */ | |
2128 | if (*str++ != '%') | |
2129 | return num; | |
2130 | continue; | |
2131 | default: | |
2132 | /* invalid format; stop here */ | |
2133 | return num; | |
2134 | } | |
2135 | ||
2136 | /* have some sort of integer conversion. | |
2137 | * first, skip white space in buffer. | |
2138 | */ | |
2139 | str = skip_spaces(str); | |
2140 | ||
2141 | digit = *str; | |
2142 | if (is_sign && digit == '-') | |
2143 | digit = *(str + 1); | |
2144 | ||
2145 | if (!digit | |
2146 | || (base == 16 && !isxdigit(digit)) | |
2147 | || (base == 10 && !isdigit(digit)) | |
2148 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
2149 | || (base == 0 && !isdigit(digit))) | |
2150 | break; | |
2151 | ||
2152 | switch (qualifier) { | |
2153 | case 'H': /* that's 'hh' in format */ | |
2154 | if (is_sign) { | |
2155 | signed char *s = (signed char *)va_arg(args, signed char *); | |
2156 | *s = (signed char)simple_strtol(str, &next, base); | |
2157 | } else { | |
2158 | unsigned char *s = (unsigned char *)va_arg(args, unsigned char *); | |
2159 | *s = (unsigned char)simple_strtoul(str, &next, base); | |
2160 | } | |
2161 | break; | |
2162 | case 'h': | |
2163 | if (is_sign) { | |
2164 | short *s = (short *)va_arg(args, short *); | |
2165 | *s = (short)simple_strtol(str, &next, base); | |
2166 | } else { | |
2167 | unsigned short *s = (unsigned short *)va_arg(args, unsigned short *); | |
2168 | *s = (unsigned short)simple_strtoul(str, &next, base); | |
2169 | } | |
2170 | break; | |
2171 | case 'l': | |
2172 | if (is_sign) { | |
2173 | long *l = (long *)va_arg(args, long *); | |
2174 | *l = simple_strtol(str, &next, base); | |
2175 | } else { | |
2176 | unsigned long *l = (unsigned long *)va_arg(args, unsigned long *); | |
2177 | *l = simple_strtoul(str, &next, base); | |
2178 | } | |
2179 | break; | |
2180 | case 'L': | |
2181 | if (is_sign) { | |
2182 | long long *l = (long long *)va_arg(args, long long *); | |
2183 | *l = simple_strtoll(str, &next, base); | |
2184 | } else { | |
2185 | unsigned long long *l = (unsigned long long *)va_arg(args, unsigned long long *); | |
2186 | *l = simple_strtoull(str, &next, base); | |
2187 | } | |
2188 | break; | |
2189 | case 'Z': | |
2190 | case 'z': | |
2191 | { | |
2192 | size_t *s = (size_t *)va_arg(args, size_t *); | |
2193 | *s = (size_t)simple_strtoul(str, &next, base); | |
2194 | } | |
2195 | break; | |
2196 | default: | |
2197 | if (is_sign) { | |
2198 | int *i = (int *)va_arg(args, int *); | |
2199 | *i = (int)simple_strtol(str, &next, base); | |
2200 | } else { | |
2201 | unsigned int *i = (unsigned int *)va_arg(args, unsigned int*); | |
2202 | *i = (unsigned int)simple_strtoul(str, &next, base); | |
2203 | } | |
2204 | break; | |
2205 | } | |
2206 | num++; | |
2207 | ||
2208 | if (!next) | |
2209 | break; | |
2210 | str = next; | |
2211 | } | |
2212 | ||
2213 | /* | |
2214 | * Now we've come all the way through so either the input string or the | |
2215 | * format ended. In the former case, there can be a %n at the current | |
2216 | * position in the format that needs to be filled. | |
2217 | */ | |
2218 | if (*fmt == '%' && *(fmt + 1) == 'n') { | |
2219 | int *p = (int *)va_arg(args, int *); | |
2220 | *p = str - buf; | |
2221 | } | |
2222 | ||
2223 | return num; | |
2224 | } | |
2225 | EXPORT_SYMBOL(vsscanf); | |
2226 | ||
2227 | /** | |
2228 | * sscanf - Unformat a buffer into a list of arguments | |
2229 | * @buf: input buffer | |
2230 | * @fmt: formatting of buffer | |
2231 | * @...: resulting arguments | |
2232 | */ | |
2233 | int sscanf(const char *buf, const char *fmt, ...) | |
2234 | { | |
2235 | va_list args; | |
2236 | int i; | |
2237 | ||
2238 | va_start(args, fmt); | |
2239 | i = vsscanf(buf, fmt, args); | |
2240 | va_end(args); | |
2241 | ||
2242 | return i; | |
2243 | } | |
2244 | EXPORT_SYMBOL(sscanf); |