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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/clk.h> | |
21 | #include <linux/clk-provider.h> | |
22 | #include <linux/module.h> /* for KSYM_SYMBOL_LEN */ | |
23 | #include <linux/types.h> | |
24 | #include <linux/string.h> | |
25 | #include <linux/ctype.h> | |
26 | #include <linux/kernel.h> | |
27 | #include <linux/kallsyms.h> | |
28 | #include <linux/math64.h> | |
29 | #include <linux/uaccess.h> | |
30 | #include <linux/ioport.h> | |
31 | #include <linux/dcache.h> | |
32 | #include <linux/cred.h> | |
33 | #include <net/addrconf.h> | |
34 | #ifdef CONFIG_BLOCK | |
35 | #include <linux/blkdev.h> | |
36 | #endif | |
37 | ||
38 | #include "../mm/internal.h" /* For the trace_print_flags arrays */ | |
39 | ||
40 | #include <asm/page.h> /* for PAGE_SIZE */ | |
41 | #include <asm/sections.h> /* for dereference_function_descriptor() */ | |
42 | #include <asm/byteorder.h> /* cpu_to_le16 */ | |
43 | ||
44 | #include <linux/string_helpers.h> | |
45 | #include "kstrtox.h" | |
46 | ||
47 | /** | |
48 | * simple_strtoull - convert a string to an unsigned long long | |
49 | * @cp: The start of the string | |
50 | * @endp: A pointer to the end of the parsed string will be placed here | |
51 | * @base: The number base to use | |
52 | * | |
53 | * This function is obsolete. Please use kstrtoull instead. | |
54 | */ | |
55 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) | |
56 | { | |
57 | unsigned long long result; | |
58 | unsigned int rv; | |
59 | ||
60 | cp = _parse_integer_fixup_radix(cp, &base); | |
61 | rv = _parse_integer(cp, base, &result); | |
62 | /* FIXME */ | |
63 | cp += (rv & ~KSTRTOX_OVERFLOW); | |
64 | ||
65 | if (endp) | |
66 | *endp = (char *)cp; | |
67 | ||
68 | return result; | |
69 | } | |
70 | EXPORT_SYMBOL(simple_strtoull); | |
71 | ||
72 | /** | |
73 | * simple_strtoul - convert a string to an unsigned long | |
74 | * @cp: The start of the string | |
75 | * @endp: A pointer to the end of the parsed string will be placed here | |
76 | * @base: The number base to use | |
77 | * | |
78 | * This function is obsolete. Please use kstrtoul instead. | |
79 | */ | |
80 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) | |
81 | { | |
82 | return simple_strtoull(cp, endp, base); | |
83 | } | |
84 | EXPORT_SYMBOL(simple_strtoul); | |
85 | ||
86 | /** | |
87 | * simple_strtol - convert a string to a signed 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 | * This function is obsolete. Please use kstrtol instead. | |
93 | */ | |
94 | long simple_strtol(const char *cp, char **endp, unsigned int base) | |
95 | { | |
96 | if (*cp == '-') | |
97 | return -simple_strtoul(cp + 1, endp, base); | |
98 | ||
99 | return simple_strtoul(cp, endp, base); | |
100 | } | |
101 | EXPORT_SYMBOL(simple_strtol); | |
102 | ||
103 | /** | |
104 | * simple_strtoll - convert a string to a signed long long | |
105 | * @cp: The start of the string | |
106 | * @endp: A pointer to the end of the parsed string will be placed here | |
107 | * @base: The number base to use | |
108 | * | |
109 | * This function is obsolete. Please use kstrtoll instead. | |
110 | */ | |
111 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) | |
112 | { | |
113 | if (*cp == '-') | |
114 | return -simple_strtoull(cp + 1, endp, base); | |
115 | ||
116 | return simple_strtoull(cp, endp, base); | |
117 | } | |
118 | EXPORT_SYMBOL(simple_strtoll); | |
119 | ||
120 | static noinline_for_stack | |
121 | int skip_atoi(const char **s) | |
122 | { | |
123 | int i = 0; | |
124 | ||
125 | do { | |
126 | i = i*10 + *((*s)++) - '0'; | |
127 | } while (isdigit(**s)); | |
128 | ||
129 | return i; | |
130 | } | |
131 | ||
132 | /* | |
133 | * Decimal conversion is by far the most typical, and is used for | |
134 | * /proc and /sys data. This directly impacts e.g. top performance | |
135 | * with many processes running. We optimize it for speed by emitting | |
136 | * two characters at a time, using a 200 byte lookup table. This | |
137 | * roughly halves the number of multiplications compared to computing | |
138 | * the digits one at a time. Implementation strongly inspired by the | |
139 | * previous version, which in turn used ideas described at | |
140 | * <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission | |
141 | * from the author, Douglas W. Jones). | |
142 | * | |
143 | * It turns out there is precisely one 26 bit fixed-point | |
144 | * approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32 | |
145 | * holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual | |
146 | * range happens to be somewhat larger (x <= 1073741898), but that's | |
147 | * irrelevant for our purpose. | |
148 | * | |
149 | * For dividing a number in the range [10^4, 10^6-1] by 100, we still | |
150 | * need a 32x32->64 bit multiply, so we simply use the same constant. | |
151 | * | |
152 | * For dividing a number in the range [100, 10^4-1] by 100, there are | |
153 | * several options. The simplest is (x * 0x147b) >> 19, which is valid | |
154 | * for all x <= 43698. | |
155 | */ | |
156 | ||
157 | static const u16 decpair[100] = { | |
158 | #define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030) | |
159 | _( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9), | |
160 | _(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19), | |
161 | _(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29), | |
162 | _(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39), | |
163 | _(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49), | |
164 | _(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59), | |
165 | _(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69), | |
166 | _(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79), | |
167 | _(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89), | |
168 | _(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99), | |
169 | #undef _ | |
170 | }; | |
171 | ||
172 | /* | |
173 | * This will print a single '0' even if r == 0, since we would | |
174 | * immediately jump to out_r where two 0s would be written but only | |
175 | * one of them accounted for in buf. This is needed by ip4_string | |
176 | * below. All other callers pass a non-zero value of r. | |
177 | */ | |
178 | static noinline_for_stack | |
179 | char *put_dec_trunc8(char *buf, unsigned r) | |
180 | { | |
181 | unsigned q; | |
182 | ||
183 | /* 1 <= r < 10^8 */ | |
184 | if (r < 100) | |
185 | goto out_r; | |
186 | ||
187 | /* 100 <= r < 10^8 */ | |
188 | q = (r * (u64)0x28f5c29) >> 32; | |
189 | *((u16 *)buf) = decpair[r - 100*q]; | |
190 | buf += 2; | |
191 | ||
192 | /* 1 <= q < 10^6 */ | |
193 | if (q < 100) | |
194 | goto out_q; | |
195 | ||
196 | /* 100 <= q < 10^6 */ | |
197 | r = (q * (u64)0x28f5c29) >> 32; | |
198 | *((u16 *)buf) = decpair[q - 100*r]; | |
199 | buf += 2; | |
200 | ||
201 | /* 1 <= r < 10^4 */ | |
202 | if (r < 100) | |
203 | goto out_r; | |
204 | ||
205 | /* 100 <= r < 10^4 */ | |
206 | q = (r * 0x147b) >> 19; | |
207 | *((u16 *)buf) = decpair[r - 100*q]; | |
208 | buf += 2; | |
209 | out_q: | |
210 | /* 1 <= q < 100 */ | |
211 | r = q; | |
212 | out_r: | |
213 | /* 1 <= r < 100 */ | |
214 | *((u16 *)buf) = decpair[r]; | |
215 | buf += r < 10 ? 1 : 2; | |
216 | return buf; | |
217 | } | |
218 | ||
219 | #if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64 | |
220 | static noinline_for_stack | |
221 | char *put_dec_full8(char *buf, unsigned r) | |
222 | { | |
223 | unsigned q; | |
224 | ||
225 | /* 0 <= r < 10^8 */ | |
226 | q = (r * (u64)0x28f5c29) >> 32; | |
227 | *((u16 *)buf) = decpair[r - 100*q]; | |
228 | buf += 2; | |
229 | ||
230 | /* 0 <= q < 10^6 */ | |
231 | r = (q * (u64)0x28f5c29) >> 32; | |
232 | *((u16 *)buf) = decpair[q - 100*r]; | |
233 | buf += 2; | |
234 | ||
235 | /* 0 <= r < 10^4 */ | |
236 | q = (r * 0x147b) >> 19; | |
237 | *((u16 *)buf) = decpair[r - 100*q]; | |
238 | buf += 2; | |
239 | ||
240 | /* 0 <= q < 100 */ | |
241 | *((u16 *)buf) = decpair[q]; | |
242 | buf += 2; | |
243 | return buf; | |
244 | } | |
245 | ||
246 | static noinline_for_stack | |
247 | char *put_dec(char *buf, unsigned long long n) | |
248 | { | |
249 | if (n >= 100*1000*1000) | |
250 | buf = put_dec_full8(buf, do_div(n, 100*1000*1000)); | |
251 | /* 1 <= n <= 1.6e11 */ | |
252 | if (n >= 100*1000*1000) | |
253 | buf = put_dec_full8(buf, do_div(n, 100*1000*1000)); | |
254 | /* 1 <= n < 1e8 */ | |
255 | return put_dec_trunc8(buf, n); | |
256 | } | |
257 | ||
258 | #elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64 | |
259 | ||
260 | static void | |
261 | put_dec_full4(char *buf, unsigned r) | |
262 | { | |
263 | unsigned q; | |
264 | ||
265 | /* 0 <= r < 10^4 */ | |
266 | q = (r * 0x147b) >> 19; | |
267 | *((u16 *)buf) = decpair[r - 100*q]; | |
268 | buf += 2; | |
269 | /* 0 <= q < 100 */ | |
270 | *((u16 *)buf) = decpair[q]; | |
271 | } | |
272 | ||
273 | /* | |
274 | * Call put_dec_full4 on x % 10000, return x / 10000. | |
275 | * The approximation x/10000 == (x * 0x346DC5D7) >> 43 | |
276 | * holds for all x < 1,128,869,999. The largest value this | |
277 | * helper will ever be asked to convert is 1,125,520,955. | |
278 | * (second call in the put_dec code, assuming n is all-ones). | |
279 | */ | |
280 | static noinline_for_stack | |
281 | unsigned put_dec_helper4(char *buf, unsigned x) | |
282 | { | |
283 | uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43; | |
284 | ||
285 | put_dec_full4(buf, x - q * 10000); | |
286 | return q; | |
287 | } | |
288 | ||
289 | /* Based on code by Douglas W. Jones found at | |
290 | * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour> | |
291 | * (with permission from the author). | |
292 | * Performs no 64-bit division and hence should be fast on 32-bit machines. | |
293 | */ | |
294 | static | |
295 | char *put_dec(char *buf, unsigned long long n) | |
296 | { | |
297 | uint32_t d3, d2, d1, q, h; | |
298 | ||
299 | if (n < 100*1000*1000) | |
300 | return put_dec_trunc8(buf, n); | |
301 | ||
302 | d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */ | |
303 | h = (n >> 32); | |
304 | d2 = (h ) & 0xffff; | |
305 | d3 = (h >> 16); /* implicit "& 0xffff" */ | |
306 | ||
307 | /* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0 | |
308 | = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */ | |
309 | q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff); | |
310 | q = put_dec_helper4(buf, q); | |
311 | ||
312 | q += 7671 * d3 + 9496 * d2 + 6 * d1; | |
313 | q = put_dec_helper4(buf+4, q); | |
314 | ||
315 | q += 4749 * d3 + 42 * d2; | |
316 | q = put_dec_helper4(buf+8, q); | |
317 | ||
318 | q += 281 * d3; | |
319 | buf += 12; | |
320 | if (q) | |
321 | buf = put_dec_trunc8(buf, q); | |
322 | else while (buf[-1] == '0') | |
323 | --buf; | |
324 | ||
325 | return buf; | |
326 | } | |
327 | ||
328 | #endif | |
329 | ||
330 | /* | |
331 | * Convert passed number to decimal string. | |
332 | * Returns the length of string. On buffer overflow, returns 0. | |
333 | * | |
334 | * If speed is not important, use snprintf(). It's easy to read the code. | |
335 | */ | |
336 | int num_to_str(char *buf, int size, unsigned long long num) | |
337 | { | |
338 | /* put_dec requires 2-byte alignment of the buffer. */ | |
339 | char tmp[sizeof(num) * 3] __aligned(2); | |
340 | int idx, len; | |
341 | ||
342 | /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */ | |
343 | if (num <= 9) { | |
344 | tmp[0] = '0' + num; | |
345 | len = 1; | |
346 | } else { | |
347 | len = put_dec(tmp, num) - tmp; | |
348 | } | |
349 | ||
350 | if (len > size) | |
351 | return 0; | |
352 | for (idx = 0; idx < len; ++idx) | |
353 | buf[idx] = tmp[len - idx - 1]; | |
354 | return len; | |
355 | } | |
356 | ||
357 | #define SIGN 1 /* unsigned/signed, must be 1 */ | |
358 | #define LEFT 2 /* left justified */ | |
359 | #define PLUS 4 /* show plus */ | |
360 | #define SPACE 8 /* space if plus */ | |
361 | #define ZEROPAD 16 /* pad with zero, must be 16 == '0' - ' ' */ | |
362 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ | |
363 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ | |
364 | ||
365 | enum format_type { | |
366 | FORMAT_TYPE_NONE, /* Just a string part */ | |
367 | FORMAT_TYPE_WIDTH, | |
368 | FORMAT_TYPE_PRECISION, | |
369 | FORMAT_TYPE_CHAR, | |
370 | FORMAT_TYPE_STR, | |
371 | FORMAT_TYPE_PTR, | |
372 | FORMAT_TYPE_PERCENT_CHAR, | |
373 | FORMAT_TYPE_INVALID, | |
374 | FORMAT_TYPE_LONG_LONG, | |
375 | FORMAT_TYPE_ULONG, | |
376 | FORMAT_TYPE_LONG, | |
377 | FORMAT_TYPE_UBYTE, | |
378 | FORMAT_TYPE_BYTE, | |
379 | FORMAT_TYPE_USHORT, | |
380 | FORMAT_TYPE_SHORT, | |
381 | FORMAT_TYPE_UINT, | |
382 | FORMAT_TYPE_INT, | |
383 | FORMAT_TYPE_SIZE_T, | |
384 | FORMAT_TYPE_PTRDIFF | |
385 | }; | |
386 | ||
387 | struct printf_spec { | |
388 | unsigned int type:8; /* format_type enum */ | |
389 | signed int field_width:24; /* width of output field */ | |
390 | unsigned int flags:8; /* flags to number() */ | |
391 | unsigned int base:8; /* number base, 8, 10 or 16 only */ | |
392 | signed int precision:16; /* # of digits/chars */ | |
393 | } __packed; | |
394 | #define FIELD_WIDTH_MAX ((1 << 23) - 1) | |
395 | #define PRECISION_MAX ((1 << 15) - 1) | |
396 | ||
397 | static noinline_for_stack | |
398 | char *number(char *buf, char *end, unsigned long long num, | |
399 | struct printf_spec spec) | |
400 | { | |
401 | /* put_dec requires 2-byte alignment of the buffer. */ | |
402 | char tmp[3 * sizeof(num)] __aligned(2); | |
403 | char sign; | |
404 | char locase; | |
405 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); | |
406 | int i; | |
407 | bool is_zero = num == 0LL; | |
408 | int field_width = spec.field_width; | |
409 | int precision = spec.precision; | |
410 | ||
411 | BUILD_BUG_ON(sizeof(struct printf_spec) != 8); | |
412 | ||
413 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' | |
414 | * produces same digits or (maybe lowercased) letters */ | |
415 | locase = (spec.flags & SMALL); | |
416 | if (spec.flags & LEFT) | |
417 | spec.flags &= ~ZEROPAD; | |
418 | sign = 0; | |
419 | if (spec.flags & SIGN) { | |
420 | if ((signed long long)num < 0) { | |
421 | sign = '-'; | |
422 | num = -(signed long long)num; | |
423 | field_width--; | |
424 | } else if (spec.flags & PLUS) { | |
425 | sign = '+'; | |
426 | field_width--; | |
427 | } else if (spec.flags & SPACE) { | |
428 | sign = ' '; | |
429 | field_width--; | |
430 | } | |
431 | } | |
432 | if (need_pfx) { | |
433 | if (spec.base == 16) | |
434 | field_width -= 2; | |
435 | else if (!is_zero) | |
436 | field_width--; | |
437 | } | |
438 | ||
439 | /* generate full string in tmp[], in reverse order */ | |
440 | i = 0; | |
441 | if (num < spec.base) | |
442 | tmp[i++] = hex_asc_upper[num] | locase; | |
443 | else if (spec.base != 10) { /* 8 or 16 */ | |
444 | int mask = spec.base - 1; | |
445 | int shift = 3; | |
446 | ||
447 | if (spec.base == 16) | |
448 | shift = 4; | |
449 | do { | |
450 | tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase); | |
451 | num >>= shift; | |
452 | } while (num); | |
453 | } else { /* base 10 */ | |
454 | i = put_dec(tmp, num) - tmp; | |
455 | } | |
456 | ||
457 | /* printing 100 using %2d gives "100", not "00" */ | |
458 | if (i > precision) | |
459 | precision = i; | |
460 | /* leading space padding */ | |
461 | field_width -= precision; | |
462 | if (!(spec.flags & (ZEROPAD | LEFT))) { | |
463 | while (--field_width >= 0) { | |
464 | if (buf < end) | |
465 | *buf = ' '; | |
466 | ++buf; | |
467 | } | |
468 | } | |
469 | /* sign */ | |
470 | if (sign) { | |
471 | if (buf < end) | |
472 | *buf = sign; | |
473 | ++buf; | |
474 | } | |
475 | /* "0x" / "0" prefix */ | |
476 | if (need_pfx) { | |
477 | if (spec.base == 16 || !is_zero) { | |
478 | if (buf < end) | |
479 | *buf = '0'; | |
480 | ++buf; | |
481 | } | |
482 | if (spec.base == 16) { | |
483 | if (buf < end) | |
484 | *buf = ('X' | locase); | |
485 | ++buf; | |
486 | } | |
487 | } | |
488 | /* zero or space padding */ | |
489 | if (!(spec.flags & LEFT)) { | |
490 | char c = ' ' + (spec.flags & ZEROPAD); | |
491 | BUILD_BUG_ON(' ' + ZEROPAD != '0'); | |
492 | while (--field_width >= 0) { | |
493 | if (buf < end) | |
494 | *buf = c; | |
495 | ++buf; | |
496 | } | |
497 | } | |
498 | /* hmm even more zero padding? */ | |
499 | while (i <= --precision) { | |
500 | if (buf < end) | |
501 | *buf = '0'; | |
502 | ++buf; | |
503 | } | |
504 | /* actual digits of result */ | |
505 | while (--i >= 0) { | |
506 | if (buf < end) | |
507 | *buf = tmp[i]; | |
508 | ++buf; | |
509 | } | |
510 | /* trailing space padding */ | |
511 | while (--field_width >= 0) { | |
512 | if (buf < end) | |
513 | *buf = ' '; | |
514 | ++buf; | |
515 | } | |
516 | ||
517 | return buf; | |
518 | } | |
519 | ||
520 | static noinline_for_stack | |
521 | char *special_hex_number(char *buf, char *end, unsigned long long num, int size) | |
522 | { | |
523 | struct printf_spec spec; | |
524 | ||
525 | spec.type = FORMAT_TYPE_PTR; | |
526 | spec.field_width = 2 + 2 * size; /* 0x + hex */ | |
527 | spec.flags = SPECIAL | SMALL | ZEROPAD; | |
528 | spec.base = 16; | |
529 | spec.precision = -1; | |
530 | ||
531 | return number(buf, end, num, spec); | |
532 | } | |
533 | ||
534 | static void move_right(char *buf, char *end, unsigned len, unsigned spaces) | |
535 | { | |
536 | size_t size; | |
537 | if (buf >= end) /* nowhere to put anything */ | |
538 | return; | |
539 | size = end - buf; | |
540 | if (size <= spaces) { | |
541 | memset(buf, ' ', size); | |
542 | return; | |
543 | } | |
544 | if (len) { | |
545 | if (len > size - spaces) | |
546 | len = size - spaces; | |
547 | memmove(buf + spaces, buf, len); | |
548 | } | |
549 | memset(buf, ' ', spaces); | |
550 | } | |
551 | ||
552 | /* | |
553 | * Handle field width padding for a string. | |
554 | * @buf: current buffer position | |
555 | * @n: length of string | |
556 | * @end: end of output buffer | |
557 | * @spec: for field width and flags | |
558 | * Returns: new buffer position after padding. | |
559 | */ | |
560 | static noinline_for_stack | |
561 | char *widen_string(char *buf, int n, char *end, struct printf_spec spec) | |
562 | { | |
563 | unsigned spaces; | |
564 | ||
565 | if (likely(n >= spec.field_width)) | |
566 | return buf; | |
567 | /* we want to pad the sucker */ | |
568 | spaces = spec.field_width - n; | |
569 | if (!(spec.flags & LEFT)) { | |
570 | move_right(buf - n, end, n, spaces); | |
571 | return buf + spaces; | |
572 | } | |
573 | while (spaces--) { | |
574 | if (buf < end) | |
575 | *buf = ' '; | |
576 | ++buf; | |
577 | } | |
578 | return buf; | |
579 | } | |
580 | ||
581 | static noinline_for_stack | |
582 | char *string(char *buf, char *end, const char *s, struct printf_spec spec) | |
583 | { | |
584 | int len = 0; | |
585 | size_t lim = spec.precision; | |
586 | ||
587 | if ((unsigned long)s < PAGE_SIZE) | |
588 | s = "(null)"; | |
589 | ||
590 | while (lim--) { | |
591 | char c = *s++; | |
592 | if (!c) | |
593 | break; | |
594 | if (buf < end) | |
595 | *buf = c; | |
596 | ++buf; | |
597 | ++len; | |
598 | } | |
599 | return widen_string(buf, len, end, spec); | |
600 | } | |
601 | ||
602 | static noinline_for_stack | |
603 | char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec, | |
604 | const char *fmt) | |
605 | { | |
606 | const char *array[4], *s; | |
607 | const struct dentry *p; | |
608 | int depth; | |
609 | int i, n; | |
610 | ||
611 | switch (fmt[1]) { | |
612 | case '2': case '3': case '4': | |
613 | depth = fmt[1] - '0'; | |
614 | break; | |
615 | default: | |
616 | depth = 1; | |
617 | } | |
618 | ||
619 | rcu_read_lock(); | |
620 | for (i = 0; i < depth; i++, d = p) { | |
621 | p = ACCESS_ONCE(d->d_parent); | |
622 | array[i] = ACCESS_ONCE(d->d_name.name); | |
623 | if (p == d) { | |
624 | if (i) | |
625 | array[i] = ""; | |
626 | i++; | |
627 | break; | |
628 | } | |
629 | } | |
630 | s = array[--i]; | |
631 | for (n = 0; n != spec.precision; n++, buf++) { | |
632 | char c = *s++; | |
633 | if (!c) { | |
634 | if (!i) | |
635 | break; | |
636 | c = '/'; | |
637 | s = array[--i]; | |
638 | } | |
639 | if (buf < end) | |
640 | *buf = c; | |
641 | } | |
642 | rcu_read_unlock(); | |
643 | return widen_string(buf, n, end, spec); | |
644 | } | |
645 | ||
646 | #ifdef CONFIG_BLOCK | |
647 | static noinline_for_stack | |
648 | char *bdev_name(char *buf, char *end, struct block_device *bdev, | |
649 | struct printf_spec spec, const char *fmt) | |
650 | { | |
651 | struct gendisk *hd = bdev->bd_disk; | |
652 | ||
653 | buf = string(buf, end, hd->disk_name, spec); | |
654 | if (bdev->bd_part->partno) { | |
655 | if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) { | |
656 | if (buf < end) | |
657 | *buf = 'p'; | |
658 | buf++; | |
659 | } | |
660 | buf = number(buf, end, bdev->bd_part->partno, spec); | |
661 | } | |
662 | return buf; | |
663 | } | |
664 | #endif | |
665 | ||
666 | static noinline_for_stack | |
667 | char *symbol_string(char *buf, char *end, void *ptr, | |
668 | struct printf_spec spec, const char *fmt) | |
669 | { | |
670 | unsigned long value; | |
671 | #ifdef CONFIG_KALLSYMS | |
672 | char sym[KSYM_SYMBOL_LEN]; | |
673 | #endif | |
674 | ||
675 | if (fmt[1] == 'R') | |
676 | ptr = __builtin_extract_return_addr(ptr); | |
677 | value = (unsigned long)ptr; | |
678 | ||
679 | #ifdef CONFIG_KALLSYMS | |
680 | if (*fmt == 'B') | |
681 | sprint_backtrace(sym, value); | |
682 | else if (*fmt != 'f' && *fmt != 's') | |
683 | sprint_symbol(sym, value); | |
684 | else | |
685 | sprint_symbol_no_offset(sym, value); | |
686 | ||
687 | return string(buf, end, sym, spec); | |
688 | #else | |
689 | return special_hex_number(buf, end, value, sizeof(void *)); | |
690 | #endif | |
691 | } | |
692 | ||
693 | static noinline_for_stack | |
694 | char *resource_string(char *buf, char *end, struct resource *res, | |
695 | struct printf_spec spec, const char *fmt) | |
696 | { | |
697 | #ifndef IO_RSRC_PRINTK_SIZE | |
698 | #define IO_RSRC_PRINTK_SIZE 6 | |
699 | #endif | |
700 | ||
701 | #ifndef MEM_RSRC_PRINTK_SIZE | |
702 | #define MEM_RSRC_PRINTK_SIZE 10 | |
703 | #endif | |
704 | static const struct printf_spec io_spec = { | |
705 | .base = 16, | |
706 | .field_width = IO_RSRC_PRINTK_SIZE, | |
707 | .precision = -1, | |
708 | .flags = SPECIAL | SMALL | ZEROPAD, | |
709 | }; | |
710 | static const struct printf_spec mem_spec = { | |
711 | .base = 16, | |
712 | .field_width = MEM_RSRC_PRINTK_SIZE, | |
713 | .precision = -1, | |
714 | .flags = SPECIAL | SMALL | ZEROPAD, | |
715 | }; | |
716 | static const struct printf_spec bus_spec = { | |
717 | .base = 16, | |
718 | .field_width = 2, | |
719 | .precision = -1, | |
720 | .flags = SMALL | ZEROPAD, | |
721 | }; | |
722 | static const struct printf_spec dec_spec = { | |
723 | .base = 10, | |
724 | .precision = -1, | |
725 | .flags = 0, | |
726 | }; | |
727 | static const struct printf_spec str_spec = { | |
728 | .field_width = -1, | |
729 | .precision = 10, | |
730 | .flags = LEFT, | |
731 | }; | |
732 | static const struct printf_spec flag_spec = { | |
733 | .base = 16, | |
734 | .precision = -1, | |
735 | .flags = SPECIAL | SMALL, | |
736 | }; | |
737 | ||
738 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) | |
739 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ | |
740 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) | |
741 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) | |
742 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") | |
743 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") | |
744 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, | |
745 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; | |
746 | ||
747 | char *p = sym, *pend = sym + sizeof(sym); | |
748 | int decode = (fmt[0] == 'R') ? 1 : 0; | |
749 | const struct printf_spec *specp; | |
750 | ||
751 | *p++ = '['; | |
752 | if (res->flags & IORESOURCE_IO) { | |
753 | p = string(p, pend, "io ", str_spec); | |
754 | specp = &io_spec; | |
755 | } else if (res->flags & IORESOURCE_MEM) { | |
756 | p = string(p, pend, "mem ", str_spec); | |
757 | specp = &mem_spec; | |
758 | } else if (res->flags & IORESOURCE_IRQ) { | |
759 | p = string(p, pend, "irq ", str_spec); | |
760 | specp = &dec_spec; | |
761 | } else if (res->flags & IORESOURCE_DMA) { | |
762 | p = string(p, pend, "dma ", str_spec); | |
763 | specp = &dec_spec; | |
764 | } else if (res->flags & IORESOURCE_BUS) { | |
765 | p = string(p, pend, "bus ", str_spec); | |
766 | specp = &bus_spec; | |
767 | } else { | |
768 | p = string(p, pend, "??? ", str_spec); | |
769 | specp = &mem_spec; | |
770 | decode = 0; | |
771 | } | |
772 | if (decode && res->flags & IORESOURCE_UNSET) { | |
773 | p = string(p, pend, "size ", str_spec); | |
774 | p = number(p, pend, resource_size(res), *specp); | |
775 | } else { | |
776 | p = number(p, pend, res->start, *specp); | |
777 | if (res->start != res->end) { | |
778 | *p++ = '-'; | |
779 | p = number(p, pend, res->end, *specp); | |
780 | } | |
781 | } | |
782 | if (decode) { | |
783 | if (res->flags & IORESOURCE_MEM_64) | |
784 | p = string(p, pend, " 64bit", str_spec); | |
785 | if (res->flags & IORESOURCE_PREFETCH) | |
786 | p = string(p, pend, " pref", str_spec); | |
787 | if (res->flags & IORESOURCE_WINDOW) | |
788 | p = string(p, pend, " window", str_spec); | |
789 | if (res->flags & IORESOURCE_DISABLED) | |
790 | p = string(p, pend, " disabled", str_spec); | |
791 | } else { | |
792 | p = string(p, pend, " flags ", str_spec); | |
793 | p = number(p, pend, res->flags, flag_spec); | |
794 | } | |
795 | *p++ = ']'; | |
796 | *p = '\0'; | |
797 | ||
798 | return string(buf, end, sym, spec); | |
799 | } | |
800 | ||
801 | static noinline_for_stack | |
802 | char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
803 | const char *fmt) | |
804 | { | |
805 | int i, len = 1; /* if we pass '%ph[CDN]', field width remains | |
806 | negative value, fallback to the default */ | |
807 | char separator; | |
808 | ||
809 | if (spec.field_width == 0) | |
810 | /* nothing to print */ | |
811 | return buf; | |
812 | ||
813 | if (ZERO_OR_NULL_PTR(addr)) | |
814 | /* NULL pointer */ | |
815 | return string(buf, end, NULL, spec); | |
816 | ||
817 | switch (fmt[1]) { | |
818 | case 'C': | |
819 | separator = ':'; | |
820 | break; | |
821 | case 'D': | |
822 | separator = '-'; | |
823 | break; | |
824 | case 'N': | |
825 | separator = 0; | |
826 | break; | |
827 | default: | |
828 | separator = ' '; | |
829 | break; | |
830 | } | |
831 | ||
832 | if (spec.field_width > 0) | |
833 | len = min_t(int, spec.field_width, 64); | |
834 | ||
835 | for (i = 0; i < len; ++i) { | |
836 | if (buf < end) | |
837 | *buf = hex_asc_hi(addr[i]); | |
838 | ++buf; | |
839 | if (buf < end) | |
840 | *buf = hex_asc_lo(addr[i]); | |
841 | ++buf; | |
842 | ||
843 | if (separator && i != len - 1) { | |
844 | if (buf < end) | |
845 | *buf = separator; | |
846 | ++buf; | |
847 | } | |
848 | } | |
849 | ||
850 | return buf; | |
851 | } | |
852 | ||
853 | static noinline_for_stack | |
854 | char *bitmap_string(char *buf, char *end, unsigned long *bitmap, | |
855 | struct printf_spec spec, const char *fmt) | |
856 | { | |
857 | const int CHUNKSZ = 32; | |
858 | int nr_bits = max_t(int, spec.field_width, 0); | |
859 | int i, chunksz; | |
860 | bool first = true; | |
861 | ||
862 | /* reused to print numbers */ | |
863 | spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 }; | |
864 | ||
865 | chunksz = nr_bits & (CHUNKSZ - 1); | |
866 | if (chunksz == 0) | |
867 | chunksz = CHUNKSZ; | |
868 | ||
869 | i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ; | |
870 | for (; i >= 0; i -= CHUNKSZ) { | |
871 | u32 chunkmask, val; | |
872 | int word, bit; | |
873 | ||
874 | chunkmask = ((1ULL << chunksz) - 1); | |
875 | word = i / BITS_PER_LONG; | |
876 | bit = i % BITS_PER_LONG; | |
877 | val = (bitmap[word] >> bit) & chunkmask; | |
878 | ||
879 | if (!first) { | |
880 | if (buf < end) | |
881 | *buf = ','; | |
882 | buf++; | |
883 | } | |
884 | first = false; | |
885 | ||
886 | spec.field_width = DIV_ROUND_UP(chunksz, 4); | |
887 | buf = number(buf, end, val, spec); | |
888 | ||
889 | chunksz = CHUNKSZ; | |
890 | } | |
891 | return buf; | |
892 | } | |
893 | ||
894 | static noinline_for_stack | |
895 | char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap, | |
896 | struct printf_spec spec, const char *fmt) | |
897 | { | |
898 | int nr_bits = max_t(int, spec.field_width, 0); | |
899 | /* current bit is 'cur', most recently seen range is [rbot, rtop] */ | |
900 | int cur, rbot, rtop; | |
901 | bool first = true; | |
902 | ||
903 | /* reused to print numbers */ | |
904 | spec = (struct printf_spec){ .base = 10 }; | |
905 | ||
906 | rbot = cur = find_first_bit(bitmap, nr_bits); | |
907 | while (cur < nr_bits) { | |
908 | rtop = cur; | |
909 | cur = find_next_bit(bitmap, nr_bits, cur + 1); | |
910 | if (cur < nr_bits && cur <= rtop + 1) | |
911 | continue; | |
912 | ||
913 | if (!first) { | |
914 | if (buf < end) | |
915 | *buf = ','; | |
916 | buf++; | |
917 | } | |
918 | first = false; | |
919 | ||
920 | buf = number(buf, end, rbot, spec); | |
921 | if (rbot < rtop) { | |
922 | if (buf < end) | |
923 | *buf = '-'; | |
924 | buf++; | |
925 | ||
926 | buf = number(buf, end, rtop, spec); | |
927 | } | |
928 | ||
929 | rbot = cur; | |
930 | } | |
931 | return buf; | |
932 | } | |
933 | ||
934 | static noinline_for_stack | |
935 | char *mac_address_string(char *buf, char *end, u8 *addr, | |
936 | struct printf_spec spec, const char *fmt) | |
937 | { | |
938 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; | |
939 | char *p = mac_addr; | |
940 | int i; | |
941 | char separator; | |
942 | bool reversed = false; | |
943 | ||
944 | switch (fmt[1]) { | |
945 | case 'F': | |
946 | separator = '-'; | |
947 | break; | |
948 | ||
949 | case 'R': | |
950 | reversed = true; | |
951 | /* fall through */ | |
952 | ||
953 | default: | |
954 | separator = ':'; | |
955 | break; | |
956 | } | |
957 | ||
958 | for (i = 0; i < 6; i++) { | |
959 | if (reversed) | |
960 | p = hex_byte_pack(p, addr[5 - i]); | |
961 | else | |
962 | p = hex_byte_pack(p, addr[i]); | |
963 | ||
964 | if (fmt[0] == 'M' && i != 5) | |
965 | *p++ = separator; | |
966 | } | |
967 | *p = '\0'; | |
968 | ||
969 | return string(buf, end, mac_addr, spec); | |
970 | } | |
971 | ||
972 | static noinline_for_stack | |
973 | char *ip4_string(char *p, const u8 *addr, const char *fmt) | |
974 | { | |
975 | int i; | |
976 | bool leading_zeros = (fmt[0] == 'i'); | |
977 | int index; | |
978 | int step; | |
979 | ||
980 | switch (fmt[2]) { | |
981 | case 'h': | |
982 | #ifdef __BIG_ENDIAN | |
983 | index = 0; | |
984 | step = 1; | |
985 | #else | |
986 | index = 3; | |
987 | step = -1; | |
988 | #endif | |
989 | break; | |
990 | case 'l': | |
991 | index = 3; | |
992 | step = -1; | |
993 | break; | |
994 | case 'n': | |
995 | case 'b': | |
996 | default: | |
997 | index = 0; | |
998 | step = 1; | |
999 | break; | |
1000 | } | |
1001 | for (i = 0; i < 4; i++) { | |
1002 | char temp[4] __aligned(2); /* hold each IP quad in reverse order */ | |
1003 | int digits = put_dec_trunc8(temp, addr[index]) - temp; | |
1004 | if (leading_zeros) { | |
1005 | if (digits < 3) | |
1006 | *p++ = '0'; | |
1007 | if (digits < 2) | |
1008 | *p++ = '0'; | |
1009 | } | |
1010 | /* reverse the digits in the quad */ | |
1011 | while (digits--) | |
1012 | *p++ = temp[digits]; | |
1013 | if (i < 3) | |
1014 | *p++ = '.'; | |
1015 | index += step; | |
1016 | } | |
1017 | *p = '\0'; | |
1018 | ||
1019 | return p; | |
1020 | } | |
1021 | ||
1022 | static noinline_for_stack | |
1023 | char *ip6_compressed_string(char *p, const char *addr) | |
1024 | { | |
1025 | int i, j, range; | |
1026 | unsigned char zerolength[8]; | |
1027 | int longest = 1; | |
1028 | int colonpos = -1; | |
1029 | u16 word; | |
1030 | u8 hi, lo; | |
1031 | bool needcolon = false; | |
1032 | bool useIPv4; | |
1033 | struct in6_addr in6; | |
1034 | ||
1035 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
1036 | ||
1037 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
1038 | ||
1039 | memset(zerolength, 0, sizeof(zerolength)); | |
1040 | ||
1041 | if (useIPv4) | |
1042 | range = 6; | |
1043 | else | |
1044 | range = 8; | |
1045 | ||
1046 | /* find position of longest 0 run */ | |
1047 | for (i = 0; i < range; i++) { | |
1048 | for (j = i; j < range; j++) { | |
1049 | if (in6.s6_addr16[j] != 0) | |
1050 | break; | |
1051 | zerolength[i]++; | |
1052 | } | |
1053 | } | |
1054 | for (i = 0; i < range; i++) { | |
1055 | if (zerolength[i] > longest) { | |
1056 | longest = zerolength[i]; | |
1057 | colonpos = i; | |
1058 | } | |
1059 | } | |
1060 | if (longest == 1) /* don't compress a single 0 */ | |
1061 | colonpos = -1; | |
1062 | ||
1063 | /* emit address */ | |
1064 | for (i = 0; i < range; i++) { | |
1065 | if (i == colonpos) { | |
1066 | if (needcolon || i == 0) | |
1067 | *p++ = ':'; | |
1068 | *p++ = ':'; | |
1069 | needcolon = false; | |
1070 | i += longest - 1; | |
1071 | continue; | |
1072 | } | |
1073 | if (needcolon) { | |
1074 | *p++ = ':'; | |
1075 | needcolon = false; | |
1076 | } | |
1077 | /* hex u16 without leading 0s */ | |
1078 | word = ntohs(in6.s6_addr16[i]); | |
1079 | hi = word >> 8; | |
1080 | lo = word & 0xff; | |
1081 | if (hi) { | |
1082 | if (hi > 0x0f) | |
1083 | p = hex_byte_pack(p, hi); | |
1084 | else | |
1085 | *p++ = hex_asc_lo(hi); | |
1086 | p = hex_byte_pack(p, lo); | |
1087 | } | |
1088 | else if (lo > 0x0f) | |
1089 | p = hex_byte_pack(p, lo); | |
1090 | else | |
1091 | *p++ = hex_asc_lo(lo); | |
1092 | needcolon = true; | |
1093 | } | |
1094 | ||
1095 | if (useIPv4) { | |
1096 | if (needcolon) | |
1097 | *p++ = ':'; | |
1098 | p = ip4_string(p, &in6.s6_addr[12], "I4"); | |
1099 | } | |
1100 | *p = '\0'; | |
1101 | ||
1102 | return p; | |
1103 | } | |
1104 | ||
1105 | static noinline_for_stack | |
1106 | char *ip6_string(char *p, const char *addr, const char *fmt) | |
1107 | { | |
1108 | int i; | |
1109 | ||
1110 | for (i = 0; i < 8; i++) { | |
1111 | p = hex_byte_pack(p, *addr++); | |
1112 | p = hex_byte_pack(p, *addr++); | |
1113 | if (fmt[0] == 'I' && i != 7) | |
1114 | *p++ = ':'; | |
1115 | } | |
1116 | *p = '\0'; | |
1117 | ||
1118 | return p; | |
1119 | } | |
1120 | ||
1121 | static noinline_for_stack | |
1122 | char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
1123 | struct printf_spec spec, const char *fmt) | |
1124 | { | |
1125 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
1126 | ||
1127 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
1128 | ip6_compressed_string(ip6_addr, addr); | |
1129 | else | |
1130 | ip6_string(ip6_addr, addr, fmt); | |
1131 | ||
1132 | return string(buf, end, ip6_addr, spec); | |
1133 | } | |
1134 | ||
1135 | static noinline_for_stack | |
1136 | char *ip4_addr_string(char *buf, char *end, const u8 *addr, | |
1137 | struct printf_spec spec, const char *fmt) | |
1138 | { | |
1139 | char ip4_addr[sizeof("255.255.255.255")]; | |
1140 | ||
1141 | ip4_string(ip4_addr, addr, fmt); | |
1142 | ||
1143 | return string(buf, end, ip4_addr, spec); | |
1144 | } | |
1145 | ||
1146 | static noinline_for_stack | |
1147 | char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa, | |
1148 | struct printf_spec spec, const char *fmt) | |
1149 | { | |
1150 | bool have_p = false, have_s = false, have_f = false, have_c = false; | |
1151 | char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") + | |
1152 | sizeof(":12345") + sizeof("/123456789") + | |
1153 | sizeof("%1234567890")]; | |
1154 | char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr); | |
1155 | const u8 *addr = (const u8 *) &sa->sin6_addr; | |
1156 | char fmt6[2] = { fmt[0], '6' }; | |
1157 | u8 off = 0; | |
1158 | ||
1159 | fmt++; | |
1160 | while (isalpha(*++fmt)) { | |
1161 | switch (*fmt) { | |
1162 | case 'p': | |
1163 | have_p = true; | |
1164 | break; | |
1165 | case 'f': | |
1166 | have_f = true; | |
1167 | break; | |
1168 | case 's': | |
1169 | have_s = true; | |
1170 | break; | |
1171 | case 'c': | |
1172 | have_c = true; | |
1173 | break; | |
1174 | } | |
1175 | } | |
1176 | ||
1177 | if (have_p || have_s || have_f) { | |
1178 | *p = '['; | |
1179 | off = 1; | |
1180 | } | |
1181 | ||
1182 | if (fmt6[0] == 'I' && have_c) | |
1183 | p = ip6_compressed_string(ip6_addr + off, addr); | |
1184 | else | |
1185 | p = ip6_string(ip6_addr + off, addr, fmt6); | |
1186 | ||
1187 | if (have_p || have_s || have_f) | |
1188 | *p++ = ']'; | |
1189 | ||
1190 | if (have_p) { | |
1191 | *p++ = ':'; | |
1192 | p = number(p, pend, ntohs(sa->sin6_port), spec); | |
1193 | } | |
1194 | if (have_f) { | |
1195 | *p++ = '/'; | |
1196 | p = number(p, pend, ntohl(sa->sin6_flowinfo & | |
1197 | IPV6_FLOWINFO_MASK), spec); | |
1198 | } | |
1199 | if (have_s) { | |
1200 | *p++ = '%'; | |
1201 | p = number(p, pend, sa->sin6_scope_id, spec); | |
1202 | } | |
1203 | *p = '\0'; | |
1204 | ||
1205 | return string(buf, end, ip6_addr, spec); | |
1206 | } | |
1207 | ||
1208 | static noinline_for_stack | |
1209 | char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa, | |
1210 | struct printf_spec spec, const char *fmt) | |
1211 | { | |
1212 | bool have_p = false; | |
1213 | char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")]; | |
1214 | char *pend = ip4_addr + sizeof(ip4_addr); | |
1215 | const u8 *addr = (const u8 *) &sa->sin_addr.s_addr; | |
1216 | char fmt4[3] = { fmt[0], '4', 0 }; | |
1217 | ||
1218 | fmt++; | |
1219 | while (isalpha(*++fmt)) { | |
1220 | switch (*fmt) { | |
1221 | case 'p': | |
1222 | have_p = true; | |
1223 | break; | |
1224 | case 'h': | |
1225 | case 'l': | |
1226 | case 'n': | |
1227 | case 'b': | |
1228 | fmt4[2] = *fmt; | |
1229 | break; | |
1230 | } | |
1231 | } | |
1232 | ||
1233 | p = ip4_string(ip4_addr, addr, fmt4); | |
1234 | if (have_p) { | |
1235 | *p++ = ':'; | |
1236 | p = number(p, pend, ntohs(sa->sin_port), spec); | |
1237 | } | |
1238 | *p = '\0'; | |
1239 | ||
1240 | return string(buf, end, ip4_addr, spec); | |
1241 | } | |
1242 | ||
1243 | static noinline_for_stack | |
1244 | char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
1245 | const char *fmt) | |
1246 | { | |
1247 | bool found = true; | |
1248 | int count = 1; | |
1249 | unsigned int flags = 0; | |
1250 | int len; | |
1251 | ||
1252 | if (spec.field_width == 0) | |
1253 | return buf; /* nothing to print */ | |
1254 | ||
1255 | if (ZERO_OR_NULL_PTR(addr)) | |
1256 | return string(buf, end, NULL, spec); /* NULL pointer */ | |
1257 | ||
1258 | ||
1259 | do { | |
1260 | switch (fmt[count++]) { | |
1261 | case 'a': | |
1262 | flags |= ESCAPE_ANY; | |
1263 | break; | |
1264 | case 'c': | |
1265 | flags |= ESCAPE_SPECIAL; | |
1266 | break; | |
1267 | case 'h': | |
1268 | flags |= ESCAPE_HEX; | |
1269 | break; | |
1270 | case 'n': | |
1271 | flags |= ESCAPE_NULL; | |
1272 | break; | |
1273 | case 'o': | |
1274 | flags |= ESCAPE_OCTAL; | |
1275 | break; | |
1276 | case 'p': | |
1277 | flags |= ESCAPE_NP; | |
1278 | break; | |
1279 | case 's': | |
1280 | flags |= ESCAPE_SPACE; | |
1281 | break; | |
1282 | default: | |
1283 | found = false; | |
1284 | break; | |
1285 | } | |
1286 | } while (found); | |
1287 | ||
1288 | if (!flags) | |
1289 | flags = ESCAPE_ANY_NP; | |
1290 | ||
1291 | len = spec.field_width < 0 ? 1 : spec.field_width; | |
1292 | ||
1293 | /* | |
1294 | * string_escape_mem() writes as many characters as it can to | |
1295 | * the given buffer, and returns the total size of the output | |
1296 | * had the buffer been big enough. | |
1297 | */ | |
1298 | buf += string_escape_mem(addr, len, buf, buf < end ? end - buf : 0, flags, NULL); | |
1299 | ||
1300 | return buf; | |
1301 | } | |
1302 | ||
1303 | static noinline_for_stack | |
1304 | char *uuid_string(char *buf, char *end, const u8 *addr, | |
1305 | struct printf_spec spec, const char *fmt) | |
1306 | { | |
1307 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; | |
1308 | char *p = uuid; | |
1309 | int i; | |
1310 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; | |
1311 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; | |
1312 | const u8 *index = be; | |
1313 | bool uc = false; | |
1314 | ||
1315 | switch (*(++fmt)) { | |
1316 | case 'L': | |
1317 | uc = true; /* fall-through */ | |
1318 | case 'l': | |
1319 | index = le; | |
1320 | break; | |
1321 | case 'B': | |
1322 | uc = true; | |
1323 | break; | |
1324 | } | |
1325 | ||
1326 | for (i = 0; i < 16; i++) { | |
1327 | if (uc) | |
1328 | p = hex_byte_pack_upper(p, addr[index[i]]); | |
1329 | else | |
1330 | p = hex_byte_pack(p, addr[index[i]]); | |
1331 | switch (i) { | |
1332 | case 3: | |
1333 | case 5: | |
1334 | case 7: | |
1335 | case 9: | |
1336 | *p++ = '-'; | |
1337 | break; | |
1338 | } | |
1339 | } | |
1340 | ||
1341 | *p = 0; | |
1342 | ||
1343 | return string(buf, end, uuid, spec); | |
1344 | } | |
1345 | ||
1346 | static noinline_for_stack | |
1347 | char *netdev_bits(char *buf, char *end, const void *addr, const char *fmt) | |
1348 | { | |
1349 | unsigned long long num; | |
1350 | int size; | |
1351 | ||
1352 | switch (fmt[1]) { | |
1353 | case 'F': | |
1354 | num = *(const netdev_features_t *)addr; | |
1355 | size = sizeof(netdev_features_t); | |
1356 | break; | |
1357 | default: | |
1358 | num = (unsigned long)addr; | |
1359 | size = sizeof(unsigned long); | |
1360 | break; | |
1361 | } | |
1362 | ||
1363 | return special_hex_number(buf, end, num, size); | |
1364 | } | |
1365 | ||
1366 | static noinline_for_stack | |
1367 | char *address_val(char *buf, char *end, const void *addr, const char *fmt) | |
1368 | { | |
1369 | unsigned long long num; | |
1370 | int size; | |
1371 | ||
1372 | switch (fmt[1]) { | |
1373 | case 'd': | |
1374 | num = *(const dma_addr_t *)addr; | |
1375 | size = sizeof(dma_addr_t); | |
1376 | break; | |
1377 | case 'p': | |
1378 | default: | |
1379 | num = *(const phys_addr_t *)addr; | |
1380 | size = sizeof(phys_addr_t); | |
1381 | break; | |
1382 | } | |
1383 | ||
1384 | return special_hex_number(buf, end, num, size); | |
1385 | } | |
1386 | ||
1387 | static noinline_for_stack | |
1388 | char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec, | |
1389 | const char *fmt) | |
1390 | { | |
1391 | if (!IS_ENABLED(CONFIG_HAVE_CLK) || !clk) | |
1392 | return string(buf, end, NULL, spec); | |
1393 | ||
1394 | switch (fmt[1]) { | |
1395 | case 'r': | |
1396 | return number(buf, end, clk_get_rate(clk), spec); | |
1397 | ||
1398 | case 'n': | |
1399 | default: | |
1400 | #ifdef CONFIG_COMMON_CLK | |
1401 | return string(buf, end, __clk_get_name(clk), spec); | |
1402 | #else | |
1403 | return special_hex_number(buf, end, (unsigned long)clk, sizeof(unsigned long)); | |
1404 | #endif | |
1405 | } | |
1406 | } | |
1407 | ||
1408 | static | |
1409 | char *format_flags(char *buf, char *end, unsigned long flags, | |
1410 | const struct trace_print_flags *names) | |
1411 | { | |
1412 | unsigned long mask; | |
1413 | const struct printf_spec strspec = { | |
1414 | .field_width = -1, | |
1415 | .precision = -1, | |
1416 | }; | |
1417 | const struct printf_spec numspec = { | |
1418 | .flags = SPECIAL|SMALL, | |
1419 | .field_width = -1, | |
1420 | .precision = -1, | |
1421 | .base = 16, | |
1422 | }; | |
1423 | ||
1424 | for ( ; flags && names->name; names++) { | |
1425 | mask = names->mask; | |
1426 | if ((flags & mask) != mask) | |
1427 | continue; | |
1428 | ||
1429 | buf = string(buf, end, names->name, strspec); | |
1430 | ||
1431 | flags &= ~mask; | |
1432 | if (flags) { | |
1433 | if (buf < end) | |
1434 | *buf = '|'; | |
1435 | buf++; | |
1436 | } | |
1437 | } | |
1438 | ||
1439 | if (flags) | |
1440 | buf = number(buf, end, flags, numspec); | |
1441 | ||
1442 | return buf; | |
1443 | } | |
1444 | ||
1445 | static noinline_for_stack | |
1446 | char *flags_string(char *buf, char *end, void *flags_ptr, const char *fmt) | |
1447 | { | |
1448 | unsigned long flags; | |
1449 | const struct trace_print_flags *names; | |
1450 | ||
1451 | switch (fmt[1]) { | |
1452 | case 'p': | |
1453 | flags = *(unsigned long *)flags_ptr; | |
1454 | /* Remove zone id */ | |
1455 | flags &= (1UL << NR_PAGEFLAGS) - 1; | |
1456 | names = pageflag_names; | |
1457 | break; | |
1458 | case 'v': | |
1459 | flags = *(unsigned long *)flags_ptr; | |
1460 | names = vmaflag_names; | |
1461 | break; | |
1462 | case 'g': | |
1463 | flags = *(gfp_t *)flags_ptr; | |
1464 | names = gfpflag_names; | |
1465 | break; | |
1466 | default: | |
1467 | WARN_ONCE(1, "Unsupported flags modifier: %c\n", fmt[1]); | |
1468 | return buf; | |
1469 | } | |
1470 | ||
1471 | return format_flags(buf, end, flags, names); | |
1472 | } | |
1473 | ||
1474 | int kptr_restrict __read_mostly; | |
1475 | ||
1476 | /* | |
1477 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
1478 | * by an extra set of alphanumeric characters that are extended format | |
1479 | * specifiers. | |
1480 | * | |
1481 | * Right now we handle: | |
1482 | * | |
1483 | * - 'F' For symbolic function descriptor pointers with offset | |
1484 | * - 'f' For simple symbolic function names without offset | |
1485 | * - 'S' For symbolic direct pointers with offset | |
1486 | * - 's' For symbolic direct pointers without offset | |
1487 | * - '[FfSs]R' as above with __builtin_extract_return_addr() translation | |
1488 | * - 'B' For backtraced symbolic direct pointers with offset | |
1489 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] | |
1490 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
1491 | * - 'b[l]' For a bitmap, the number of bits is determined by the field | |
1492 | * width which must be explicitly specified either as part of the | |
1493 | * format string '%32b[l]' or through '%*b[l]', [l] selects | |
1494 | * range-list format instead of hex format | |
1495 | * - 'M' For a 6-byte MAC address, it prints the address in the | |
1496 | * usual colon-separated hex notation | |
1497 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons | |
1498 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address | |
1499 | * with a dash-separated hex notation | |
1500 | * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth) | |
1501 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way | |
1502 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
1503 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
1504 | * [S][pfs] | |
1505 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1506 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
1507 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses | |
1508 | * IPv6 omits the colons (01020304...0f) | |
1509 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
1510 | * [S][pfs] | |
1511 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1512 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
1513 | * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order | |
1514 | * - 'I[6S]c' for IPv6 addresses printed as specified by | |
1515 | * http://tools.ietf.org/html/rfc5952 | |
1516 | * - 'E[achnops]' For an escaped buffer, where rules are defined by combination | |
1517 | * of the following flags (see string_escape_mem() for the | |
1518 | * details): | |
1519 | * a - ESCAPE_ANY | |
1520 | * c - ESCAPE_SPECIAL | |
1521 | * h - ESCAPE_HEX | |
1522 | * n - ESCAPE_NULL | |
1523 | * o - ESCAPE_OCTAL | |
1524 | * p - ESCAPE_NP | |
1525 | * s - ESCAPE_SPACE | |
1526 | * By default ESCAPE_ANY_NP is used. | |
1527 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form | |
1528 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" | |
1529 | * Options for %pU are: | |
1530 | * b big endian lower case hex (default) | |
1531 | * B big endian UPPER case hex | |
1532 | * l little endian lower case hex | |
1533 | * L little endian UPPER case hex | |
1534 | * big endian output byte order is: | |
1535 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] | |
1536 | * little endian output byte order is: | |
1537 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] | |
1538 | * - 'V' For a struct va_format which contains a format string * and va_list *, | |
1539 | * call vsnprintf(->format, *->va_list). | |
1540 | * Implements a "recursive vsnprintf". | |
1541 | * Do not use this feature without some mechanism to verify the | |
1542 | * correctness of the format string and va_list arguments. | |
1543 | * - 'K' For a kernel pointer that should be hidden from unprivileged users | |
1544 | * - 'NF' For a netdev_features_t | |
1545 | * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with | |
1546 | * a certain separator (' ' by default): | |
1547 | * C colon | |
1548 | * D dash | |
1549 | * N no separator | |
1550 | * The maximum supported length is 64 bytes of the input. Consider | |
1551 | * to use print_hex_dump() for the larger input. | |
1552 | * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives | |
1553 | * (default assumed to be phys_addr_t, passed by reference) | |
1554 | * - 'd[234]' For a dentry name (optionally 2-4 last components) | |
1555 | * - 'D[234]' Same as 'd' but for a struct file | |
1556 | * - 'g' For block_device name (gendisk + partition number) | |
1557 | * - 'C' For a clock, it prints the name (Common Clock Framework) or address | |
1558 | * (legacy clock framework) of the clock | |
1559 | * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address | |
1560 | * (legacy clock framework) of the clock | |
1561 | * - 'Cr' For a clock, it prints the current rate of the clock | |
1562 | * - 'G' For flags to be printed as a collection of symbolic strings that would | |
1563 | * construct the specific value. Supported flags given by option: | |
1564 | * p page flags (see struct page) given as pointer to unsigned long | |
1565 | * g gfp flags (GFP_* and __GFP_*) given as pointer to gfp_t | |
1566 | * v vma flags (VM_*) given as pointer to unsigned long | |
1567 | * | |
1568 | * ** Please update also Documentation/printk-formats.txt when making changes ** | |
1569 | * | |
1570 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 | |
1571 | * function pointers are really function descriptors, which contain a | |
1572 | * pointer to the real address. | |
1573 | */ | |
1574 | static noinline_for_stack | |
1575 | char *pointer(const char *fmt, char *buf, char *end, void *ptr, | |
1576 | struct printf_spec spec) | |
1577 | { | |
1578 | const int default_width = 2 * sizeof(void *); | |
1579 | ||
1580 | if (!ptr && *fmt != 'K') { | |
1581 | /* | |
1582 | * Print (null) with the same width as a pointer so it makes | |
1583 | * tabular output look nice. | |
1584 | */ | |
1585 | if (spec.field_width == -1) | |
1586 | spec.field_width = default_width; | |
1587 | return string(buf, end, "(null)", spec); | |
1588 | } | |
1589 | ||
1590 | switch (*fmt) { | |
1591 | case 'F': | |
1592 | case 'f': | |
1593 | ptr = dereference_function_descriptor(ptr); | |
1594 | /* Fallthrough */ | |
1595 | case 'S': | |
1596 | case 's': | |
1597 | case 'B': | |
1598 | return symbol_string(buf, end, ptr, spec, fmt); | |
1599 | case 'R': | |
1600 | case 'r': | |
1601 | return resource_string(buf, end, ptr, spec, fmt); | |
1602 | case 'h': | |
1603 | return hex_string(buf, end, ptr, spec, fmt); | |
1604 | case 'b': | |
1605 | switch (fmt[1]) { | |
1606 | case 'l': | |
1607 | return bitmap_list_string(buf, end, ptr, spec, fmt); | |
1608 | default: | |
1609 | return bitmap_string(buf, end, ptr, spec, fmt); | |
1610 | } | |
1611 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ | |
1612 | case 'm': /* Contiguous: 000102030405 */ | |
1613 | /* [mM]F (FDDI) */ | |
1614 | /* [mM]R (Reverse order; Bluetooth) */ | |
1615 | return mac_address_string(buf, end, ptr, spec, fmt); | |
1616 | case 'I': /* Formatted IP supported | |
1617 | * 4: 1.2.3.4 | |
1618 | * 6: 0001:0203:...:0708 | |
1619 | * 6c: 1::708 or 1::1.2.3.4 | |
1620 | */ | |
1621 | case 'i': /* Contiguous: | |
1622 | * 4: 001.002.003.004 | |
1623 | * 6: 000102...0f | |
1624 | */ | |
1625 | switch (fmt[1]) { | |
1626 | case '6': | |
1627 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
1628 | case '4': | |
1629 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
1630 | case 'S': { | |
1631 | const union { | |
1632 | struct sockaddr raw; | |
1633 | struct sockaddr_in v4; | |
1634 | struct sockaddr_in6 v6; | |
1635 | } *sa = ptr; | |
1636 | ||
1637 | switch (sa->raw.sa_family) { | |
1638 | case AF_INET: | |
1639 | return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt); | |
1640 | case AF_INET6: | |
1641 | return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt); | |
1642 | default: | |
1643 | return string(buf, end, "(invalid address)", spec); | |
1644 | }} | |
1645 | } | |
1646 | break; | |
1647 | case 'E': | |
1648 | return escaped_string(buf, end, ptr, spec, fmt); | |
1649 | case 'U': | |
1650 | return uuid_string(buf, end, ptr, spec, fmt); | |
1651 | case 'V': | |
1652 | { | |
1653 | va_list va; | |
1654 | ||
1655 | va_copy(va, *((struct va_format *)ptr)->va); | |
1656 | buf += vsnprintf(buf, end > buf ? end - buf : 0, | |
1657 | ((struct va_format *)ptr)->fmt, va); | |
1658 | va_end(va); | |
1659 | return buf; | |
1660 | } | |
1661 | case 'K': | |
1662 | switch (kptr_restrict) { | |
1663 | case 0: | |
1664 | /* Always print %pK values */ | |
1665 | break; | |
1666 | case 1: { | |
1667 | const struct cred *cred; | |
1668 | ||
1669 | /* | |
1670 | * kptr_restrict==1 cannot be used in IRQ context | |
1671 | * because its test for CAP_SYSLOG would be meaningless. | |
1672 | */ | |
1673 | if (in_irq() || in_serving_softirq() || in_nmi()) { | |
1674 | if (spec.field_width == -1) | |
1675 | spec.field_width = default_width; | |
1676 | return string(buf, end, "pK-error", spec); | |
1677 | } | |
1678 | ||
1679 | /* | |
1680 | * Only print the real pointer value if the current | |
1681 | * process has CAP_SYSLOG and is running with the | |
1682 | * same credentials it started with. This is because | |
1683 | * access to files is checked at open() time, but %pK | |
1684 | * checks permission at read() time. We don't want to | |
1685 | * leak pointer values if a binary opens a file using | |
1686 | * %pK and then elevates privileges before reading it. | |
1687 | */ | |
1688 | cred = current_cred(); | |
1689 | if (!has_capability_noaudit(current, CAP_SYSLOG) || | |
1690 | !uid_eq(cred->euid, cred->uid) || | |
1691 | !gid_eq(cred->egid, cred->gid)) | |
1692 | ptr = NULL; | |
1693 | break; | |
1694 | } | |
1695 | case 2: | |
1696 | default: | |
1697 | /* Always print 0's for %pK */ | |
1698 | ptr = NULL; | |
1699 | break; | |
1700 | } | |
1701 | break; | |
1702 | ||
1703 | case 'N': | |
1704 | return netdev_bits(buf, end, ptr, fmt); | |
1705 | case 'a': | |
1706 | return address_val(buf, end, ptr, fmt); | |
1707 | case 'd': | |
1708 | return dentry_name(buf, end, ptr, spec, fmt); | |
1709 | case 'C': | |
1710 | return clock(buf, end, ptr, spec, fmt); | |
1711 | case 'D': | |
1712 | return dentry_name(buf, end, | |
1713 | ((const struct file *)ptr)->f_path.dentry, | |
1714 | spec, fmt); | |
1715 | #ifdef CONFIG_BLOCK | |
1716 | case 'g': | |
1717 | return bdev_name(buf, end, ptr, spec, fmt); | |
1718 | #endif | |
1719 | ||
1720 | case 'G': | |
1721 | return flags_string(buf, end, ptr, fmt); | |
1722 | } | |
1723 | spec.flags |= SMALL; | |
1724 | if (spec.field_width == -1) { | |
1725 | spec.field_width = default_width; | |
1726 | spec.flags |= ZEROPAD; | |
1727 | } | |
1728 | spec.base = 16; | |
1729 | ||
1730 | return number(buf, end, (unsigned long) ptr, spec); | |
1731 | } | |
1732 | ||
1733 | /* | |
1734 | * Helper function to decode printf style format. | |
1735 | * Each call decode a token from the format and return the | |
1736 | * number of characters read (or likely the delta where it wants | |
1737 | * to go on the next call). | |
1738 | * The decoded token is returned through the parameters | |
1739 | * | |
1740 | * 'h', 'l', or 'L' for integer fields | |
1741 | * 'z' support added 23/7/1999 S.H. | |
1742 | * 'z' changed to 'Z' --davidm 1/25/99 | |
1743 | * 't' added for ptrdiff_t | |
1744 | * | |
1745 | * @fmt: the format string | |
1746 | * @type of the token returned | |
1747 | * @flags: various flags such as +, -, # tokens.. | |
1748 | * @field_width: overwritten width | |
1749 | * @base: base of the number (octal, hex, ...) | |
1750 | * @precision: precision of a number | |
1751 | * @qualifier: qualifier of a number (long, size_t, ...) | |
1752 | */ | |
1753 | static noinline_for_stack | |
1754 | int format_decode(const char *fmt, struct printf_spec *spec) | |
1755 | { | |
1756 | const char *start = fmt; | |
1757 | char qualifier; | |
1758 | ||
1759 | /* we finished early by reading the field width */ | |
1760 | if (spec->type == FORMAT_TYPE_WIDTH) { | |
1761 | if (spec->field_width < 0) { | |
1762 | spec->field_width = -spec->field_width; | |
1763 | spec->flags |= LEFT; | |
1764 | } | |
1765 | spec->type = FORMAT_TYPE_NONE; | |
1766 | goto precision; | |
1767 | } | |
1768 | ||
1769 | /* we finished early by reading the precision */ | |
1770 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
1771 | if (spec->precision < 0) | |
1772 | spec->precision = 0; | |
1773 | ||
1774 | spec->type = FORMAT_TYPE_NONE; | |
1775 | goto qualifier; | |
1776 | } | |
1777 | ||
1778 | /* By default */ | |
1779 | spec->type = FORMAT_TYPE_NONE; | |
1780 | ||
1781 | for (; *fmt ; ++fmt) { | |
1782 | if (*fmt == '%') | |
1783 | break; | |
1784 | } | |
1785 | ||
1786 | /* Return the current non-format string */ | |
1787 | if (fmt != start || !*fmt) | |
1788 | return fmt - start; | |
1789 | ||
1790 | /* Process flags */ | |
1791 | spec->flags = 0; | |
1792 | ||
1793 | while (1) { /* this also skips first '%' */ | |
1794 | bool found = true; | |
1795 | ||
1796 | ++fmt; | |
1797 | ||
1798 | switch (*fmt) { | |
1799 | case '-': spec->flags |= LEFT; break; | |
1800 | case '+': spec->flags |= PLUS; break; | |
1801 | case ' ': spec->flags |= SPACE; break; | |
1802 | case '#': spec->flags |= SPECIAL; break; | |
1803 | case '0': spec->flags |= ZEROPAD; break; | |
1804 | default: found = false; | |
1805 | } | |
1806 | ||
1807 | if (!found) | |
1808 | break; | |
1809 | } | |
1810 | ||
1811 | /* get field width */ | |
1812 | spec->field_width = -1; | |
1813 | ||
1814 | if (isdigit(*fmt)) | |
1815 | spec->field_width = skip_atoi(&fmt); | |
1816 | else if (*fmt == '*') { | |
1817 | /* it's the next argument */ | |
1818 | spec->type = FORMAT_TYPE_WIDTH; | |
1819 | return ++fmt - start; | |
1820 | } | |
1821 | ||
1822 | precision: | |
1823 | /* get the precision */ | |
1824 | spec->precision = -1; | |
1825 | if (*fmt == '.') { | |
1826 | ++fmt; | |
1827 | if (isdigit(*fmt)) { | |
1828 | spec->precision = skip_atoi(&fmt); | |
1829 | if (spec->precision < 0) | |
1830 | spec->precision = 0; | |
1831 | } else if (*fmt == '*') { | |
1832 | /* it's the next argument */ | |
1833 | spec->type = FORMAT_TYPE_PRECISION; | |
1834 | return ++fmt - start; | |
1835 | } | |
1836 | } | |
1837 | ||
1838 | qualifier: | |
1839 | /* get the conversion qualifier */ | |
1840 | qualifier = 0; | |
1841 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || | |
1842 | _tolower(*fmt) == 'z' || *fmt == 't') { | |
1843 | qualifier = *fmt++; | |
1844 | if (unlikely(qualifier == *fmt)) { | |
1845 | if (qualifier == 'l') { | |
1846 | qualifier = 'L'; | |
1847 | ++fmt; | |
1848 | } else if (qualifier == 'h') { | |
1849 | qualifier = 'H'; | |
1850 | ++fmt; | |
1851 | } | |
1852 | } | |
1853 | } | |
1854 | ||
1855 | /* default base */ | |
1856 | spec->base = 10; | |
1857 | switch (*fmt) { | |
1858 | case 'c': | |
1859 | spec->type = FORMAT_TYPE_CHAR; | |
1860 | return ++fmt - start; | |
1861 | ||
1862 | case 's': | |
1863 | spec->type = FORMAT_TYPE_STR; | |
1864 | return ++fmt - start; | |
1865 | ||
1866 | case 'p': | |
1867 | spec->type = FORMAT_TYPE_PTR; | |
1868 | return ++fmt - start; | |
1869 | ||
1870 | case '%': | |
1871 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
1872 | return ++fmt - start; | |
1873 | ||
1874 | /* integer number formats - set up the flags and "break" */ | |
1875 | case 'o': | |
1876 | spec->base = 8; | |
1877 | break; | |
1878 | ||
1879 | case 'x': | |
1880 | spec->flags |= SMALL; | |
1881 | ||
1882 | case 'X': | |
1883 | spec->base = 16; | |
1884 | break; | |
1885 | ||
1886 | case 'd': | |
1887 | case 'i': | |
1888 | spec->flags |= SIGN; | |
1889 | case 'u': | |
1890 | break; | |
1891 | ||
1892 | case 'n': | |
1893 | /* | |
1894 | * Since %n poses a greater security risk than | |
1895 | * utility, treat it as any other invalid or | |
1896 | * unsupported format specifier. | |
1897 | */ | |
1898 | /* Fall-through */ | |
1899 | ||
1900 | default: | |
1901 | WARN_ONCE(1, "Please remove unsupported %%%c in format string\n", *fmt); | |
1902 | spec->type = FORMAT_TYPE_INVALID; | |
1903 | return fmt - start; | |
1904 | } | |
1905 | ||
1906 | if (qualifier == 'L') | |
1907 | spec->type = FORMAT_TYPE_LONG_LONG; | |
1908 | else if (qualifier == 'l') { | |
1909 | BUILD_BUG_ON(FORMAT_TYPE_ULONG + SIGN != FORMAT_TYPE_LONG); | |
1910 | spec->type = FORMAT_TYPE_ULONG + (spec->flags & SIGN); | |
1911 | } else if (_tolower(qualifier) == 'z') { | |
1912 | spec->type = FORMAT_TYPE_SIZE_T; | |
1913 | } else if (qualifier == 't') { | |
1914 | spec->type = FORMAT_TYPE_PTRDIFF; | |
1915 | } else if (qualifier == 'H') { | |
1916 | BUILD_BUG_ON(FORMAT_TYPE_UBYTE + SIGN != FORMAT_TYPE_BYTE); | |
1917 | spec->type = FORMAT_TYPE_UBYTE + (spec->flags & SIGN); | |
1918 | } else if (qualifier == 'h') { | |
1919 | BUILD_BUG_ON(FORMAT_TYPE_USHORT + SIGN != FORMAT_TYPE_SHORT); | |
1920 | spec->type = FORMAT_TYPE_USHORT + (spec->flags & SIGN); | |
1921 | } else { | |
1922 | BUILD_BUG_ON(FORMAT_TYPE_UINT + SIGN != FORMAT_TYPE_INT); | |
1923 | spec->type = FORMAT_TYPE_UINT + (spec->flags & SIGN); | |
1924 | } | |
1925 | ||
1926 | return ++fmt - start; | |
1927 | } | |
1928 | ||
1929 | static void | |
1930 | set_field_width(struct printf_spec *spec, int width) | |
1931 | { | |
1932 | spec->field_width = width; | |
1933 | if (WARN_ONCE(spec->field_width != width, "field width %d too large", width)) { | |
1934 | spec->field_width = clamp(width, -FIELD_WIDTH_MAX, FIELD_WIDTH_MAX); | |
1935 | } | |
1936 | } | |
1937 | ||
1938 | static void | |
1939 | set_precision(struct printf_spec *spec, int prec) | |
1940 | { | |
1941 | spec->precision = prec; | |
1942 | if (WARN_ONCE(spec->precision != prec, "precision %d too large", prec)) { | |
1943 | spec->precision = clamp(prec, 0, PRECISION_MAX); | |
1944 | } | |
1945 | } | |
1946 | ||
1947 | /** | |
1948 | * vsnprintf - Format a string and place it in a buffer | |
1949 | * @buf: The buffer to place the result into | |
1950 | * @size: The size of the buffer, including the trailing null space | |
1951 | * @fmt: The format string to use | |
1952 | * @args: Arguments for the format string | |
1953 | * | |
1954 | * This function generally follows C99 vsnprintf, but has some | |
1955 | * extensions and a few limitations: | |
1956 | * | |
1957 | * %n is unsupported | |
1958 | * %p* is handled by pointer() | |
1959 | * | |
1960 | * See pointer() or Documentation/printk-formats.txt for more | |
1961 | * extensive description. | |
1962 | * | |
1963 | * ** Please update the documentation in both places when making changes ** | |
1964 | * | |
1965 | * The return value is the number of characters which would | |
1966 | * be generated for the given input, excluding the trailing | |
1967 | * '\0', as per ISO C99. If you want to have the exact | |
1968 | * number of characters written into @buf as return value | |
1969 | * (not including the trailing '\0'), use vscnprintf(). If the | |
1970 | * return is greater than or equal to @size, the resulting | |
1971 | * string is truncated. | |
1972 | * | |
1973 | * If you're not already dealing with a va_list consider using snprintf(). | |
1974 | */ | |
1975 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1976 | { | |
1977 | unsigned long long num; | |
1978 | char *str, *end; | |
1979 | struct printf_spec spec = {0}; | |
1980 | ||
1981 | /* Reject out-of-range values early. Large positive sizes are | |
1982 | used for unknown buffer sizes. */ | |
1983 | if (WARN_ON_ONCE(size > INT_MAX)) | |
1984 | return 0; | |
1985 | ||
1986 | str = buf; | |
1987 | end = buf + size; | |
1988 | ||
1989 | /* Make sure end is always >= buf */ | |
1990 | if (end < buf) { | |
1991 | end = ((void *)-1); | |
1992 | size = end - buf; | |
1993 | } | |
1994 | ||
1995 | while (*fmt) { | |
1996 | const char *old_fmt = fmt; | |
1997 | int read = format_decode(fmt, &spec); | |
1998 | ||
1999 | fmt += read; | |
2000 | ||
2001 | switch (spec.type) { | |
2002 | case FORMAT_TYPE_NONE: { | |
2003 | int copy = read; | |
2004 | if (str < end) { | |
2005 | if (copy > end - str) | |
2006 | copy = end - str; | |
2007 | memcpy(str, old_fmt, copy); | |
2008 | } | |
2009 | str += read; | |
2010 | break; | |
2011 | } | |
2012 | ||
2013 | case FORMAT_TYPE_WIDTH: | |
2014 | set_field_width(&spec, va_arg(args, int)); | |
2015 | break; | |
2016 | ||
2017 | case FORMAT_TYPE_PRECISION: | |
2018 | set_precision(&spec, va_arg(args, int)); | |
2019 | break; | |
2020 | ||
2021 | case FORMAT_TYPE_CHAR: { | |
2022 | char c; | |
2023 | ||
2024 | if (!(spec.flags & LEFT)) { | |
2025 | while (--spec.field_width > 0) { | |
2026 | if (str < end) | |
2027 | *str = ' '; | |
2028 | ++str; | |
2029 | ||
2030 | } | |
2031 | } | |
2032 | c = (unsigned char) va_arg(args, int); | |
2033 | if (str < end) | |
2034 | *str = c; | |
2035 | ++str; | |
2036 | while (--spec.field_width > 0) { | |
2037 | if (str < end) | |
2038 | *str = ' '; | |
2039 | ++str; | |
2040 | } | |
2041 | break; | |
2042 | } | |
2043 | ||
2044 | case FORMAT_TYPE_STR: | |
2045 | str = string(str, end, va_arg(args, char *), spec); | |
2046 | break; | |
2047 | ||
2048 | case FORMAT_TYPE_PTR: | |
2049 | str = pointer(fmt, str, end, va_arg(args, void *), | |
2050 | spec); | |
2051 | while (isalnum(*fmt)) | |
2052 | fmt++; | |
2053 | break; | |
2054 | ||
2055 | case FORMAT_TYPE_PERCENT_CHAR: | |
2056 | if (str < end) | |
2057 | *str = '%'; | |
2058 | ++str; | |
2059 | break; | |
2060 | ||
2061 | case FORMAT_TYPE_INVALID: | |
2062 | /* | |
2063 | * Presumably the arguments passed gcc's type | |
2064 | * checking, but there is no safe or sane way | |
2065 | * for us to continue parsing the format and | |
2066 | * fetching from the va_list; the remaining | |
2067 | * specifiers and arguments would be out of | |
2068 | * sync. | |
2069 | */ | |
2070 | goto out; | |
2071 | ||
2072 | default: | |
2073 | switch (spec.type) { | |
2074 | case FORMAT_TYPE_LONG_LONG: | |
2075 | num = va_arg(args, long long); | |
2076 | break; | |
2077 | case FORMAT_TYPE_ULONG: | |
2078 | num = va_arg(args, unsigned long); | |
2079 | break; | |
2080 | case FORMAT_TYPE_LONG: | |
2081 | num = va_arg(args, long); | |
2082 | break; | |
2083 | case FORMAT_TYPE_SIZE_T: | |
2084 | if (spec.flags & SIGN) | |
2085 | num = va_arg(args, ssize_t); | |
2086 | else | |
2087 | num = va_arg(args, size_t); | |
2088 | break; | |
2089 | case FORMAT_TYPE_PTRDIFF: | |
2090 | num = va_arg(args, ptrdiff_t); | |
2091 | break; | |
2092 | case FORMAT_TYPE_UBYTE: | |
2093 | num = (unsigned char) va_arg(args, int); | |
2094 | break; | |
2095 | case FORMAT_TYPE_BYTE: | |
2096 | num = (signed char) va_arg(args, int); | |
2097 | break; | |
2098 | case FORMAT_TYPE_USHORT: | |
2099 | num = (unsigned short) va_arg(args, int); | |
2100 | break; | |
2101 | case FORMAT_TYPE_SHORT: | |
2102 | num = (short) va_arg(args, int); | |
2103 | break; | |
2104 | case FORMAT_TYPE_INT: | |
2105 | num = (int) va_arg(args, int); | |
2106 | break; | |
2107 | default: | |
2108 | num = va_arg(args, unsigned int); | |
2109 | } | |
2110 | ||
2111 | str = number(str, end, num, spec); | |
2112 | } | |
2113 | } | |
2114 | ||
2115 | out: | |
2116 | if (size > 0) { | |
2117 | if (str < end) | |
2118 | *str = '\0'; | |
2119 | else | |
2120 | end[-1] = '\0'; | |
2121 | } | |
2122 | ||
2123 | /* the trailing null byte doesn't count towards the total */ | |
2124 | return str-buf; | |
2125 | ||
2126 | } | |
2127 | EXPORT_SYMBOL(vsnprintf); | |
2128 | ||
2129 | /** | |
2130 | * vscnprintf - Format a string and place it in a buffer | |
2131 | * @buf: The buffer to place the result into | |
2132 | * @size: The size of the buffer, including the trailing null space | |
2133 | * @fmt: The format string to use | |
2134 | * @args: Arguments for the format string | |
2135 | * | |
2136 | * The return value is the number of characters which have been written into | |
2137 | * the @buf not including the trailing '\0'. If @size is == 0 the function | |
2138 | * returns 0. | |
2139 | * | |
2140 | * If you're not already dealing with a va_list consider using scnprintf(). | |
2141 | * | |
2142 | * See the vsnprintf() documentation for format string extensions over C99. | |
2143 | */ | |
2144 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
2145 | { | |
2146 | int i; | |
2147 | ||
2148 | i = vsnprintf(buf, size, fmt, args); | |
2149 | ||
2150 | if (likely(i < size)) | |
2151 | return i; | |
2152 | if (size != 0) | |
2153 | return size - 1; | |
2154 | return 0; | |
2155 | } | |
2156 | EXPORT_SYMBOL(vscnprintf); | |
2157 | ||
2158 | /** | |
2159 | * snprintf - Format a string and place it in a buffer | |
2160 | * @buf: The buffer to place the result into | |
2161 | * @size: The size of the buffer, including the trailing null space | |
2162 | * @fmt: The format string to use | |
2163 | * @...: Arguments for the format string | |
2164 | * | |
2165 | * The return value is the number of characters which would be | |
2166 | * generated for the given input, excluding the trailing null, | |
2167 | * as per ISO C99. If the return is greater than or equal to | |
2168 | * @size, the resulting string is truncated. | |
2169 | * | |
2170 | * See the vsnprintf() documentation for format string extensions over C99. | |
2171 | */ | |
2172 | int snprintf(char *buf, size_t size, const char *fmt, ...) | |
2173 | { | |
2174 | va_list args; | |
2175 | int i; | |
2176 | ||
2177 | va_start(args, fmt); | |
2178 | i = vsnprintf(buf, size, fmt, args); | |
2179 | va_end(args); | |
2180 | ||
2181 | return i; | |
2182 | } | |
2183 | EXPORT_SYMBOL(snprintf); | |
2184 | ||
2185 | /** | |
2186 | * scnprintf - Format a string and place it in a buffer | |
2187 | * @buf: The buffer to place the result into | |
2188 | * @size: The size of the buffer, including the trailing null space | |
2189 | * @fmt: The format string to use | |
2190 | * @...: Arguments for the format string | |
2191 | * | |
2192 | * The return value is the number of characters written into @buf not including | |
2193 | * the trailing '\0'. If @size is == 0 the function returns 0. | |
2194 | */ | |
2195 | ||
2196 | int scnprintf(char *buf, size_t size, const char *fmt, ...) | |
2197 | { | |
2198 | va_list args; | |
2199 | int i; | |
2200 | ||
2201 | va_start(args, fmt); | |
2202 | i = vscnprintf(buf, size, fmt, args); | |
2203 | va_end(args); | |
2204 | ||
2205 | return i; | |
2206 | } | |
2207 | EXPORT_SYMBOL(scnprintf); | |
2208 | ||
2209 | /** | |
2210 | * vsprintf - Format a string and place it in a buffer | |
2211 | * @buf: The buffer to place the result into | |
2212 | * @fmt: The format string to use | |
2213 | * @args: Arguments for the format string | |
2214 | * | |
2215 | * The function returns the number of characters written | |
2216 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid | |
2217 | * buffer overflows. | |
2218 | * | |
2219 | * If you're not already dealing with a va_list consider using sprintf(). | |
2220 | * | |
2221 | * See the vsnprintf() documentation for format string extensions over C99. | |
2222 | */ | |
2223 | int vsprintf(char *buf, const char *fmt, va_list args) | |
2224 | { | |
2225 | return vsnprintf(buf, INT_MAX, fmt, args); | |
2226 | } | |
2227 | EXPORT_SYMBOL(vsprintf); | |
2228 | ||
2229 | /** | |
2230 | * sprintf - Format a string and place it in a buffer | |
2231 | * @buf: The buffer to place the result into | |
2232 | * @fmt: The format string to use | |
2233 | * @...: Arguments for the format string | |
2234 | * | |
2235 | * The function returns the number of characters written | |
2236 | * into @buf. Use snprintf() or scnprintf() in order to avoid | |
2237 | * buffer overflows. | |
2238 | * | |
2239 | * See the vsnprintf() documentation for format string extensions over C99. | |
2240 | */ | |
2241 | int sprintf(char *buf, const char *fmt, ...) | |
2242 | { | |
2243 | va_list args; | |
2244 | int i; | |
2245 | ||
2246 | va_start(args, fmt); | |
2247 | i = vsnprintf(buf, INT_MAX, fmt, args); | |
2248 | va_end(args); | |
2249 | ||
2250 | return i; | |
2251 | } | |
2252 | EXPORT_SYMBOL(sprintf); | |
2253 | ||
2254 | #ifdef CONFIG_BINARY_PRINTF | |
2255 | /* | |
2256 | * bprintf service: | |
2257 | * vbin_printf() - VA arguments to binary data | |
2258 | * bstr_printf() - Binary data to text string | |
2259 | */ | |
2260 | ||
2261 | /** | |
2262 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
2263 | * @bin_buf: The buffer to place args' binary value | |
2264 | * @size: The size of the buffer(by words(32bits), not characters) | |
2265 | * @fmt: The format string to use | |
2266 | * @args: Arguments for the format string | |
2267 | * | |
2268 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
2269 | * is skipped. | |
2270 | * | |
2271 | * The return value is the number of words(32bits) which would be generated for | |
2272 | * the given input. | |
2273 | * | |
2274 | * NOTE: | |
2275 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
2276 | * valid for bstr_printf(). | |
2277 | */ | |
2278 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
2279 | { | |
2280 | struct printf_spec spec = {0}; | |
2281 | char *str, *end; | |
2282 | ||
2283 | str = (char *)bin_buf; | |
2284 | end = (char *)(bin_buf + size); | |
2285 | ||
2286 | #define save_arg(type) \ | |
2287 | do { \ | |
2288 | if (sizeof(type) == 8) { \ | |
2289 | unsigned long long value; \ | |
2290 | str = PTR_ALIGN(str, sizeof(u32)); \ | |
2291 | value = va_arg(args, unsigned long long); \ | |
2292 | if (str + sizeof(type) <= end) { \ | |
2293 | *(u32 *)str = *(u32 *)&value; \ | |
2294 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ | |
2295 | } \ | |
2296 | } else { \ | |
2297 | unsigned long value; \ | |
2298 | str = PTR_ALIGN(str, sizeof(type)); \ | |
2299 | value = va_arg(args, int); \ | |
2300 | if (str + sizeof(type) <= end) \ | |
2301 | *(typeof(type) *)str = (type)value; \ | |
2302 | } \ | |
2303 | str += sizeof(type); \ | |
2304 | } while (0) | |
2305 | ||
2306 | while (*fmt) { | |
2307 | int read = format_decode(fmt, &spec); | |
2308 | ||
2309 | fmt += read; | |
2310 | ||
2311 | switch (spec.type) { | |
2312 | case FORMAT_TYPE_NONE: | |
2313 | case FORMAT_TYPE_PERCENT_CHAR: | |
2314 | break; | |
2315 | case FORMAT_TYPE_INVALID: | |
2316 | goto out; | |
2317 | ||
2318 | case FORMAT_TYPE_WIDTH: | |
2319 | case FORMAT_TYPE_PRECISION: | |
2320 | save_arg(int); | |
2321 | break; | |
2322 | ||
2323 | case FORMAT_TYPE_CHAR: | |
2324 | save_arg(char); | |
2325 | break; | |
2326 | ||
2327 | case FORMAT_TYPE_STR: { | |
2328 | const char *save_str = va_arg(args, char *); | |
2329 | size_t len; | |
2330 | ||
2331 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE | |
2332 | || (unsigned long)save_str < PAGE_SIZE) | |
2333 | save_str = "(null)"; | |
2334 | len = strlen(save_str) + 1; | |
2335 | if (str + len < end) | |
2336 | memcpy(str, save_str, len); | |
2337 | str += len; | |
2338 | break; | |
2339 | } | |
2340 | ||
2341 | case FORMAT_TYPE_PTR: | |
2342 | save_arg(void *); | |
2343 | /* skip all alphanumeric pointer suffixes */ | |
2344 | while (isalnum(*fmt)) | |
2345 | fmt++; | |
2346 | break; | |
2347 | ||
2348 | default: | |
2349 | switch (spec.type) { | |
2350 | ||
2351 | case FORMAT_TYPE_LONG_LONG: | |
2352 | save_arg(long long); | |
2353 | break; | |
2354 | case FORMAT_TYPE_ULONG: | |
2355 | case FORMAT_TYPE_LONG: | |
2356 | save_arg(unsigned long); | |
2357 | break; | |
2358 | case FORMAT_TYPE_SIZE_T: | |
2359 | save_arg(size_t); | |
2360 | break; | |
2361 | case FORMAT_TYPE_PTRDIFF: | |
2362 | save_arg(ptrdiff_t); | |
2363 | break; | |
2364 | case FORMAT_TYPE_UBYTE: | |
2365 | case FORMAT_TYPE_BYTE: | |
2366 | save_arg(char); | |
2367 | break; | |
2368 | case FORMAT_TYPE_USHORT: | |
2369 | case FORMAT_TYPE_SHORT: | |
2370 | save_arg(short); | |
2371 | break; | |
2372 | default: | |
2373 | save_arg(int); | |
2374 | } | |
2375 | } | |
2376 | } | |
2377 | ||
2378 | out: | |
2379 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; | |
2380 | #undef save_arg | |
2381 | } | |
2382 | EXPORT_SYMBOL_GPL(vbin_printf); | |
2383 | ||
2384 | /** | |
2385 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
2386 | * @buf: The buffer to place the result into | |
2387 | * @size: The size of the buffer, including the trailing null space | |
2388 | * @fmt: The format string to use | |
2389 | * @bin_buf: Binary arguments for the format string | |
2390 | * | |
2391 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
2392 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
2393 | * a binary buffer that generated by vbin_printf. | |
2394 | * | |
2395 | * The format follows C99 vsnprintf, but has some extensions: | |
2396 | * see vsnprintf comment for details. | |
2397 | * | |
2398 | * The return value is the number of characters which would | |
2399 | * be generated for the given input, excluding the trailing | |
2400 | * '\0', as per ISO C99. If you want to have the exact | |
2401 | * number of characters written into @buf as return value | |
2402 | * (not including the trailing '\0'), use vscnprintf(). If the | |
2403 | * return is greater than or equal to @size, the resulting | |
2404 | * string is truncated. | |
2405 | */ | |
2406 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
2407 | { | |
2408 | struct printf_spec spec = {0}; | |
2409 | char *str, *end; | |
2410 | const char *args = (const char *)bin_buf; | |
2411 | ||
2412 | if (WARN_ON_ONCE(size > INT_MAX)) | |
2413 | return 0; | |
2414 | ||
2415 | str = buf; | |
2416 | end = buf + size; | |
2417 | ||
2418 | #define get_arg(type) \ | |
2419 | ({ \ | |
2420 | typeof(type) value; \ | |
2421 | if (sizeof(type) == 8) { \ | |
2422 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
2423 | *(u32 *)&value = *(u32 *)args; \ | |
2424 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
2425 | } else { \ | |
2426 | args = PTR_ALIGN(args, sizeof(type)); \ | |
2427 | value = *(typeof(type) *)args; \ | |
2428 | } \ | |
2429 | args += sizeof(type); \ | |
2430 | value; \ | |
2431 | }) | |
2432 | ||
2433 | /* Make sure end is always >= buf */ | |
2434 | if (end < buf) { | |
2435 | end = ((void *)-1); | |
2436 | size = end - buf; | |
2437 | } | |
2438 | ||
2439 | while (*fmt) { | |
2440 | const char *old_fmt = fmt; | |
2441 | int read = format_decode(fmt, &spec); | |
2442 | ||
2443 | fmt += read; | |
2444 | ||
2445 | switch (spec.type) { | |
2446 | case FORMAT_TYPE_NONE: { | |
2447 | int copy = read; | |
2448 | if (str < end) { | |
2449 | if (copy > end - str) | |
2450 | copy = end - str; | |
2451 | memcpy(str, old_fmt, copy); | |
2452 | } | |
2453 | str += read; | |
2454 | break; | |
2455 | } | |
2456 | ||
2457 | case FORMAT_TYPE_WIDTH: | |
2458 | set_field_width(&spec, get_arg(int)); | |
2459 | break; | |
2460 | ||
2461 | case FORMAT_TYPE_PRECISION: | |
2462 | set_precision(&spec, get_arg(int)); | |
2463 | break; | |
2464 | ||
2465 | case FORMAT_TYPE_CHAR: { | |
2466 | char c; | |
2467 | ||
2468 | if (!(spec.flags & LEFT)) { | |
2469 | while (--spec.field_width > 0) { | |
2470 | if (str < end) | |
2471 | *str = ' '; | |
2472 | ++str; | |
2473 | } | |
2474 | } | |
2475 | c = (unsigned char) get_arg(char); | |
2476 | if (str < end) | |
2477 | *str = c; | |
2478 | ++str; | |
2479 | while (--spec.field_width > 0) { | |
2480 | if (str < end) | |
2481 | *str = ' '; | |
2482 | ++str; | |
2483 | } | |
2484 | break; | |
2485 | } | |
2486 | ||
2487 | case FORMAT_TYPE_STR: { | |
2488 | const char *str_arg = args; | |
2489 | args += strlen(str_arg) + 1; | |
2490 | str = string(str, end, (char *)str_arg, spec); | |
2491 | break; | |
2492 | } | |
2493 | ||
2494 | case FORMAT_TYPE_PTR: | |
2495 | str = pointer(fmt, str, end, get_arg(void *), spec); | |
2496 | while (isalnum(*fmt)) | |
2497 | fmt++; | |
2498 | break; | |
2499 | ||
2500 | case FORMAT_TYPE_PERCENT_CHAR: | |
2501 | if (str < end) | |
2502 | *str = '%'; | |
2503 | ++str; | |
2504 | break; | |
2505 | ||
2506 | case FORMAT_TYPE_INVALID: | |
2507 | goto out; | |
2508 | ||
2509 | default: { | |
2510 | unsigned long long num; | |
2511 | ||
2512 | switch (spec.type) { | |
2513 | ||
2514 | case FORMAT_TYPE_LONG_LONG: | |
2515 | num = get_arg(long long); | |
2516 | break; | |
2517 | case FORMAT_TYPE_ULONG: | |
2518 | case FORMAT_TYPE_LONG: | |
2519 | num = get_arg(unsigned long); | |
2520 | break; | |
2521 | case FORMAT_TYPE_SIZE_T: | |
2522 | num = get_arg(size_t); | |
2523 | break; | |
2524 | case FORMAT_TYPE_PTRDIFF: | |
2525 | num = get_arg(ptrdiff_t); | |
2526 | break; | |
2527 | case FORMAT_TYPE_UBYTE: | |
2528 | num = get_arg(unsigned char); | |
2529 | break; | |
2530 | case FORMAT_TYPE_BYTE: | |
2531 | num = get_arg(signed char); | |
2532 | break; | |
2533 | case FORMAT_TYPE_USHORT: | |
2534 | num = get_arg(unsigned short); | |
2535 | break; | |
2536 | case FORMAT_TYPE_SHORT: | |
2537 | num = get_arg(short); | |
2538 | break; | |
2539 | case FORMAT_TYPE_UINT: | |
2540 | num = get_arg(unsigned int); | |
2541 | break; | |
2542 | default: | |
2543 | num = get_arg(int); | |
2544 | } | |
2545 | ||
2546 | str = number(str, end, num, spec); | |
2547 | } /* default: */ | |
2548 | } /* switch(spec.type) */ | |
2549 | } /* while(*fmt) */ | |
2550 | ||
2551 | out: | |
2552 | if (size > 0) { | |
2553 | if (str < end) | |
2554 | *str = '\0'; | |
2555 | else | |
2556 | end[-1] = '\0'; | |
2557 | } | |
2558 | ||
2559 | #undef get_arg | |
2560 | ||
2561 | /* the trailing null byte doesn't count towards the total */ | |
2562 | return str - buf; | |
2563 | } | |
2564 | EXPORT_SYMBOL_GPL(bstr_printf); | |
2565 | ||
2566 | /** | |
2567 | * bprintf - Parse a format string and place args' binary value in a buffer | |
2568 | * @bin_buf: The buffer to place args' binary value | |
2569 | * @size: The size of the buffer(by words(32bits), not characters) | |
2570 | * @fmt: The format string to use | |
2571 | * @...: Arguments for the format string | |
2572 | * | |
2573 | * The function returns the number of words(u32) written | |
2574 | * into @bin_buf. | |
2575 | */ | |
2576 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
2577 | { | |
2578 | va_list args; | |
2579 | int ret; | |
2580 | ||
2581 | va_start(args, fmt); | |
2582 | ret = vbin_printf(bin_buf, size, fmt, args); | |
2583 | va_end(args); | |
2584 | ||
2585 | return ret; | |
2586 | } | |
2587 | EXPORT_SYMBOL_GPL(bprintf); | |
2588 | ||
2589 | #endif /* CONFIG_BINARY_PRINTF */ | |
2590 | ||
2591 | /** | |
2592 | * vsscanf - Unformat a buffer into a list of arguments | |
2593 | * @buf: input buffer | |
2594 | * @fmt: format of buffer | |
2595 | * @args: arguments | |
2596 | */ | |
2597 | int vsscanf(const char *buf, const char *fmt, va_list args) | |
2598 | { | |
2599 | const char *str = buf; | |
2600 | char *next; | |
2601 | char digit; | |
2602 | int num = 0; | |
2603 | u8 qualifier; | |
2604 | unsigned int base; | |
2605 | union { | |
2606 | long long s; | |
2607 | unsigned long long u; | |
2608 | } val; | |
2609 | s16 field_width; | |
2610 | bool is_sign; | |
2611 | ||
2612 | while (*fmt) { | |
2613 | /* skip any white space in format */ | |
2614 | /* white space in format matchs any amount of | |
2615 | * white space, including none, in the input. | |
2616 | */ | |
2617 | if (isspace(*fmt)) { | |
2618 | fmt = skip_spaces(++fmt); | |
2619 | str = skip_spaces(str); | |
2620 | } | |
2621 | ||
2622 | /* anything that is not a conversion must match exactly */ | |
2623 | if (*fmt != '%' && *fmt) { | |
2624 | if (*fmt++ != *str++) | |
2625 | break; | |
2626 | continue; | |
2627 | } | |
2628 | ||
2629 | if (!*fmt) | |
2630 | break; | |
2631 | ++fmt; | |
2632 | ||
2633 | /* skip this conversion. | |
2634 | * advance both strings to next white space | |
2635 | */ | |
2636 | if (*fmt == '*') { | |
2637 | if (!*str) | |
2638 | break; | |
2639 | while (!isspace(*fmt) && *fmt != '%' && *fmt) { | |
2640 | /* '%*[' not yet supported, invalid format */ | |
2641 | if (*fmt == '[') | |
2642 | return num; | |
2643 | fmt++; | |
2644 | } | |
2645 | while (!isspace(*str) && *str) | |
2646 | str++; | |
2647 | continue; | |
2648 | } | |
2649 | ||
2650 | /* get field width */ | |
2651 | field_width = -1; | |
2652 | if (isdigit(*fmt)) { | |
2653 | field_width = skip_atoi(&fmt); | |
2654 | if (field_width <= 0) | |
2655 | break; | |
2656 | } | |
2657 | ||
2658 | /* get conversion qualifier */ | |
2659 | qualifier = -1; | |
2660 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || | |
2661 | _tolower(*fmt) == 'z') { | |
2662 | qualifier = *fmt++; | |
2663 | if (unlikely(qualifier == *fmt)) { | |
2664 | if (qualifier == 'h') { | |
2665 | qualifier = 'H'; | |
2666 | fmt++; | |
2667 | } else if (qualifier == 'l') { | |
2668 | qualifier = 'L'; | |
2669 | fmt++; | |
2670 | } | |
2671 | } | |
2672 | } | |
2673 | ||
2674 | if (!*fmt) | |
2675 | break; | |
2676 | ||
2677 | if (*fmt == 'n') { | |
2678 | /* return number of characters read so far */ | |
2679 | *va_arg(args, int *) = str - buf; | |
2680 | ++fmt; | |
2681 | continue; | |
2682 | } | |
2683 | ||
2684 | if (!*str) | |
2685 | break; | |
2686 | ||
2687 | base = 10; | |
2688 | is_sign = false; | |
2689 | ||
2690 | switch (*fmt++) { | |
2691 | case 'c': | |
2692 | { | |
2693 | char *s = (char *)va_arg(args, char*); | |
2694 | if (field_width == -1) | |
2695 | field_width = 1; | |
2696 | do { | |
2697 | *s++ = *str++; | |
2698 | } while (--field_width > 0 && *str); | |
2699 | num++; | |
2700 | } | |
2701 | continue; | |
2702 | case 's': | |
2703 | { | |
2704 | char *s = (char *)va_arg(args, char *); | |
2705 | if (field_width == -1) | |
2706 | field_width = SHRT_MAX; | |
2707 | /* first, skip leading white space in buffer */ | |
2708 | str = skip_spaces(str); | |
2709 | ||
2710 | /* now copy until next white space */ | |
2711 | while (*str && !isspace(*str) && field_width--) | |
2712 | *s++ = *str++; | |
2713 | *s = '\0'; | |
2714 | num++; | |
2715 | } | |
2716 | continue; | |
2717 | /* | |
2718 | * Warning: This implementation of the '[' conversion specifier | |
2719 | * deviates from its glibc counterpart in the following ways: | |
2720 | * (1) It does NOT support ranges i.e. '-' is NOT a special | |
2721 | * character | |
2722 | * (2) It cannot match the closing bracket ']' itself | |
2723 | * (3) A field width is required | |
2724 | * (4) '%*[' (discard matching input) is currently not supported | |
2725 | * | |
2726 | * Example usage: | |
2727 | * ret = sscanf("00:0a:95","%2[^:]:%2[^:]:%2[^:]", | |
2728 | * buf1, buf2, buf3); | |
2729 | * if (ret < 3) | |
2730 | * // etc.. | |
2731 | */ | |
2732 | case '[': | |
2733 | { | |
2734 | char *s = (char *)va_arg(args, char *); | |
2735 | DECLARE_BITMAP(set, 256) = {0}; | |
2736 | unsigned int len = 0; | |
2737 | bool negate = (*fmt == '^'); | |
2738 | ||
2739 | /* field width is required */ | |
2740 | if (field_width == -1) | |
2741 | return num; | |
2742 | ||
2743 | if (negate) | |
2744 | ++fmt; | |
2745 | ||
2746 | for ( ; *fmt && *fmt != ']'; ++fmt, ++len) | |
2747 | set_bit((u8)*fmt, set); | |
2748 | ||
2749 | /* no ']' or no character set found */ | |
2750 | if (!*fmt || !len) | |
2751 | return num; | |
2752 | ++fmt; | |
2753 | ||
2754 | if (negate) { | |
2755 | bitmap_complement(set, set, 256); | |
2756 | /* exclude null '\0' byte */ | |
2757 | clear_bit(0, set); | |
2758 | } | |
2759 | ||
2760 | /* match must be non-empty */ | |
2761 | if (!test_bit((u8)*str, set)) | |
2762 | return num; | |
2763 | ||
2764 | while (test_bit((u8)*str, set) && field_width--) | |
2765 | *s++ = *str++; | |
2766 | *s = '\0'; | |
2767 | ++num; | |
2768 | } | |
2769 | continue; | |
2770 | case 'o': | |
2771 | base = 8; | |
2772 | break; | |
2773 | case 'x': | |
2774 | case 'X': | |
2775 | base = 16; | |
2776 | break; | |
2777 | case 'i': | |
2778 | base = 0; | |
2779 | case 'd': | |
2780 | is_sign = true; | |
2781 | case 'u': | |
2782 | break; | |
2783 | case '%': | |
2784 | /* looking for '%' in str */ | |
2785 | if (*str++ != '%') | |
2786 | return num; | |
2787 | continue; | |
2788 | default: | |
2789 | /* invalid format; stop here */ | |
2790 | return num; | |
2791 | } | |
2792 | ||
2793 | /* have some sort of integer conversion. | |
2794 | * first, skip white space in buffer. | |
2795 | */ | |
2796 | str = skip_spaces(str); | |
2797 | ||
2798 | digit = *str; | |
2799 | if (is_sign && digit == '-') | |
2800 | digit = *(str + 1); | |
2801 | ||
2802 | if (!digit | |
2803 | || (base == 16 && !isxdigit(digit)) | |
2804 | || (base == 10 && !isdigit(digit)) | |
2805 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
2806 | || (base == 0 && !isdigit(digit))) | |
2807 | break; | |
2808 | ||
2809 | if (is_sign) | |
2810 | val.s = qualifier != 'L' ? | |
2811 | simple_strtol(str, &next, base) : | |
2812 | simple_strtoll(str, &next, base); | |
2813 | else | |
2814 | val.u = qualifier != 'L' ? | |
2815 | simple_strtoul(str, &next, base) : | |
2816 | simple_strtoull(str, &next, base); | |
2817 | ||
2818 | if (field_width > 0 && next - str > field_width) { | |
2819 | if (base == 0) | |
2820 | _parse_integer_fixup_radix(str, &base); | |
2821 | while (next - str > field_width) { | |
2822 | if (is_sign) | |
2823 | val.s = div_s64(val.s, base); | |
2824 | else | |
2825 | val.u = div_u64(val.u, base); | |
2826 | --next; | |
2827 | } | |
2828 | } | |
2829 | ||
2830 | switch (qualifier) { | |
2831 | case 'H': /* that's 'hh' in format */ | |
2832 | if (is_sign) | |
2833 | *va_arg(args, signed char *) = val.s; | |
2834 | else | |
2835 | *va_arg(args, unsigned char *) = val.u; | |
2836 | break; | |
2837 | case 'h': | |
2838 | if (is_sign) | |
2839 | *va_arg(args, short *) = val.s; | |
2840 | else | |
2841 | *va_arg(args, unsigned short *) = val.u; | |
2842 | break; | |
2843 | case 'l': | |
2844 | if (is_sign) | |
2845 | *va_arg(args, long *) = val.s; | |
2846 | else | |
2847 | *va_arg(args, unsigned long *) = val.u; | |
2848 | break; | |
2849 | case 'L': | |
2850 | if (is_sign) | |
2851 | *va_arg(args, long long *) = val.s; | |
2852 | else | |
2853 | *va_arg(args, unsigned long long *) = val.u; | |
2854 | break; | |
2855 | case 'Z': | |
2856 | case 'z': | |
2857 | *va_arg(args, size_t *) = val.u; | |
2858 | break; | |
2859 | default: | |
2860 | if (is_sign) | |
2861 | *va_arg(args, int *) = val.s; | |
2862 | else | |
2863 | *va_arg(args, unsigned int *) = val.u; | |
2864 | break; | |
2865 | } | |
2866 | num++; | |
2867 | ||
2868 | if (!next) | |
2869 | break; | |
2870 | str = next; | |
2871 | } | |
2872 | ||
2873 | return num; | |
2874 | } | |
2875 | EXPORT_SYMBOL(vsscanf); | |
2876 | ||
2877 | /** | |
2878 | * sscanf - Unformat a buffer into a list of arguments | |
2879 | * @buf: input buffer | |
2880 | * @fmt: formatting of buffer | |
2881 | * @...: resulting arguments | |
2882 | */ | |
2883 | int sscanf(const char *buf, const char *fmt, ...) | |
2884 | { | |
2885 | va_list args; | |
2886 | int i; | |
2887 | ||
2888 | va_start(args, fmt); | |
2889 | i = vsscanf(buf, fmt, args); | |
2890 | va_end(args); | |
2891 | ||
2892 | return i; | |
2893 | } | |
2894 | EXPORT_SYMBOL(sscanf); |