Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/lib/vsprintf.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | */ | |
6 | ||
7 | /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */ | |
8 | /* | |
9 | * Wirzenius wrote this portably, Torvalds fucked it up :-) | |
10 | */ | |
11 | ||
7b9186f5 | 12 | /* |
1da177e4 LT |
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> | |
8bc3bcc9 | 20 | #include <linux/module.h> /* for KSYM_SYMBOL_LEN */ |
1da177e4 LT |
21 | #include <linux/types.h> |
22 | #include <linux/string.h> | |
23 | #include <linux/ctype.h> | |
24 | #include <linux/kernel.h> | |
0fe1ef24 | 25 | #include <linux/kallsyms.h> |
53809751 | 26 | #include <linux/math64.h> |
0fe1ef24 | 27 | #include <linux/uaccess.h> |
332d2e78 | 28 | #include <linux/ioport.h> |
4b6ccca7 | 29 | #include <linux/dcache.h> |
312b4e22 | 30 | #include <linux/cred.h> |
8a27f7c9 | 31 | #include <net/addrconf.h> |
1da177e4 | 32 | |
4e57b681 | 33 | #include <asm/page.h> /* for PAGE_SIZE */ |
deac93df | 34 | #include <asm/sections.h> /* for dereference_function_descriptor() */ |
1da177e4 | 35 | |
1dff46d6 | 36 | #include "kstrtox.h" |
aa46a63e | 37 | |
1da177e4 | 38 | /** |
922ac25c | 39 | * simple_strtoull - convert a string to an unsigned long long |
1da177e4 LT |
40 | * @cp: The start of the string |
41 | * @endp: A pointer to the end of the parsed string will be placed here | |
42 | * @base: The number base to use | |
462e4711 EZ |
43 | * |
44 | * This function is obsolete. Please use kstrtoull instead. | |
1da177e4 | 45 | */ |
922ac25c | 46 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
1da177e4 | 47 | { |
1dff46d6 AD |
48 | unsigned long long result; |
49 | unsigned int rv; | |
aa46a63e | 50 | |
1dff46d6 AD |
51 | cp = _parse_integer_fixup_radix(cp, &base); |
52 | rv = _parse_integer(cp, base, &result); | |
53 | /* FIXME */ | |
54 | cp += (rv & ~KSTRTOX_OVERFLOW); | |
aa46a63e | 55 | |
1da177e4 LT |
56 | if (endp) |
57 | *endp = (char *)cp; | |
7b9186f5 | 58 | |
1da177e4 LT |
59 | return result; |
60 | } | |
922ac25c | 61 | EXPORT_SYMBOL(simple_strtoull); |
1da177e4 LT |
62 | |
63 | /** | |
922ac25c | 64 | * simple_strtoul - convert a string to an unsigned long |
1da177e4 LT |
65 | * @cp: The start of the string |
66 | * @endp: A pointer to the end of the parsed string will be placed here | |
67 | * @base: The number base to use | |
462e4711 EZ |
68 | * |
69 | * This function is obsolete. Please use kstrtoul instead. | |
1da177e4 | 70 | */ |
922ac25c | 71 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
1da177e4 | 72 | { |
922ac25c | 73 | return simple_strtoull(cp, endp, base); |
1da177e4 | 74 | } |
922ac25c | 75 | EXPORT_SYMBOL(simple_strtoul); |
1da177e4 LT |
76 | |
77 | /** | |
922ac25c | 78 | * simple_strtol - convert a string to a signed long |
1da177e4 LT |
79 | * @cp: The start of the string |
80 | * @endp: A pointer to the end of the parsed string will be placed here | |
81 | * @base: The number base to use | |
462e4711 EZ |
82 | * |
83 | * This function is obsolete. Please use kstrtol instead. | |
1da177e4 | 84 | */ |
922ac25c | 85 | long simple_strtol(const char *cp, char **endp, unsigned int base) |
1da177e4 | 86 | { |
922ac25c AGR |
87 | if (*cp == '-') |
88 | return -simple_strtoul(cp + 1, endp, base); | |
7b9186f5 | 89 | |
922ac25c | 90 | return simple_strtoul(cp, endp, base); |
1da177e4 | 91 | } |
922ac25c | 92 | EXPORT_SYMBOL(simple_strtol); |
1da177e4 LT |
93 | |
94 | /** | |
95 | * simple_strtoll - convert a string to a signed long long | |
96 | * @cp: The start of the string | |
97 | * @endp: A pointer to the end of the parsed string will be placed here | |
98 | * @base: The number base to use | |
462e4711 EZ |
99 | * |
100 | * This function is obsolete. Please use kstrtoll instead. | |
1da177e4 | 101 | */ |
22d27051 | 102 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
1da177e4 | 103 | { |
7b9186f5 | 104 | if (*cp == '-') |
22d27051 | 105 | return -simple_strtoull(cp + 1, endp, base); |
7b9186f5 | 106 | |
22d27051 | 107 | return simple_strtoull(cp, endp, base); |
1da177e4 | 108 | } |
98d5ce0d | 109 | EXPORT_SYMBOL(simple_strtoll); |
1da177e4 | 110 | |
cf3b429b JP |
111 | static noinline_for_stack |
112 | int skip_atoi(const char **s) | |
1da177e4 | 113 | { |
7b9186f5 | 114 | int i = 0; |
1da177e4 LT |
115 | |
116 | while (isdigit(**s)) | |
117 | i = i*10 + *((*s)++) - '0'; | |
7b9186f5 | 118 | |
1da177e4 LT |
119 | return i; |
120 | } | |
121 | ||
4277eedd DV |
122 | /* Decimal conversion is by far the most typical, and is used |
123 | * for /proc and /sys data. This directly impacts e.g. top performance | |
124 | * with many processes running. We optimize it for speed | |
133fd9f5 DV |
125 | * using ideas described at <http://www.cs.uiowa.edu/~jones/bcd/divide.html> |
126 | * (with permission from the author, Douglas W. Jones). | |
127 | */ | |
4277eedd | 128 | |
133fd9f5 DV |
129 | #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64 |
130 | /* Formats correctly any integer in [0, 999999999] */ | |
cf3b429b | 131 | static noinline_for_stack |
133fd9f5 | 132 | char *put_dec_full9(char *buf, unsigned q) |
4277eedd | 133 | { |
133fd9f5 | 134 | unsigned r; |
7b9186f5 | 135 | |
133fd9f5 DV |
136 | /* |
137 | * Possible ways to approx. divide by 10 | |
138 | * (x * 0x1999999a) >> 32 x < 1073741829 (multiply must be 64-bit) | |
139 | * (x * 0xcccd) >> 19 x < 81920 (x < 262149 when 64-bit mul) | |
140 | * (x * 0x6667) >> 18 x < 43699 | |
141 | * (x * 0x3334) >> 17 x < 16389 | |
142 | * (x * 0x199a) >> 16 x < 16389 | |
143 | * (x * 0x0ccd) >> 15 x < 16389 | |
144 | * (x * 0x0667) >> 14 x < 2739 | |
145 | * (x * 0x0334) >> 13 x < 1029 | |
146 | * (x * 0x019a) >> 12 x < 1029 | |
147 | * (x * 0x00cd) >> 11 x < 1029 shorter code than * 0x67 (on i386) | |
148 | * (x * 0x0067) >> 10 x < 179 | |
149 | * (x * 0x0034) >> 9 x < 69 same | |
150 | * (x * 0x001a) >> 8 x < 69 same | |
151 | * (x * 0x000d) >> 7 x < 69 same, shortest code (on i386) | |
152 | * (x * 0x0007) >> 6 x < 19 | |
153 | * See <http://www.cs.uiowa.edu/~jones/bcd/divide.html> | |
154 | */ | |
155 | r = (q * (uint64_t)0x1999999a) >> 32; | |
156 | *buf++ = (q - 10 * r) + '0'; /* 1 */ | |
157 | q = (r * (uint64_t)0x1999999a) >> 32; | |
158 | *buf++ = (r - 10 * q) + '0'; /* 2 */ | |
159 | r = (q * (uint64_t)0x1999999a) >> 32; | |
160 | *buf++ = (q - 10 * r) + '0'; /* 3 */ | |
161 | q = (r * (uint64_t)0x1999999a) >> 32; | |
162 | *buf++ = (r - 10 * q) + '0'; /* 4 */ | |
163 | r = (q * (uint64_t)0x1999999a) >> 32; | |
164 | *buf++ = (q - 10 * r) + '0'; /* 5 */ | |
165 | /* Now value is under 10000, can avoid 64-bit multiply */ | |
166 | q = (r * 0x199a) >> 16; | |
167 | *buf++ = (r - 10 * q) + '0'; /* 6 */ | |
168 | r = (q * 0xcd) >> 11; | |
169 | *buf++ = (q - 10 * r) + '0'; /* 7 */ | |
170 | q = (r * 0xcd) >> 11; | |
171 | *buf++ = (r - 10 * q) + '0'; /* 8 */ | |
172 | *buf++ = q + '0'; /* 9 */ | |
4277eedd DV |
173 | return buf; |
174 | } | |
133fd9f5 DV |
175 | #endif |
176 | ||
177 | /* Similar to above but do not pad with zeros. | |
178 | * Code can be easily arranged to print 9 digits too, but our callers | |
179 | * always call put_dec_full9() instead when the number has 9 decimal digits. | |
180 | */ | |
cf3b429b | 181 | static noinline_for_stack |
133fd9f5 | 182 | char *put_dec_trunc8(char *buf, unsigned r) |
4277eedd | 183 | { |
133fd9f5 DV |
184 | unsigned q; |
185 | ||
186 | /* Copy of previous function's body with added early returns */ | |
cb239d0a GS |
187 | while (r >= 10000) { |
188 | q = r + '0'; | |
189 | r = (r * (uint64_t)0x1999999a) >> 32; | |
190 | *buf++ = q - 10*r; | |
191 | } | |
192 | ||
f4000516 GS |
193 | q = (r * 0x199a) >> 16; /* r <= 9999 */ |
194 | *buf++ = (r - 10 * q) + '0'; | |
133fd9f5 DV |
195 | if (q == 0) |
196 | return buf; | |
f4000516 GS |
197 | r = (q * 0xcd) >> 11; /* q <= 999 */ |
198 | *buf++ = (q - 10 * r) + '0'; | |
133fd9f5 DV |
199 | if (r == 0) |
200 | return buf; | |
f4000516 GS |
201 | q = (r * 0xcd) >> 11; /* r <= 99 */ |
202 | *buf++ = (r - 10 * q) + '0'; | |
133fd9f5 DV |
203 | if (q == 0) |
204 | return buf; | |
f4000516 | 205 | *buf++ = q + '0'; /* q <= 9 */ |
133fd9f5 DV |
206 | return buf; |
207 | } | |
4277eedd | 208 | |
133fd9f5 DV |
209 | /* There are two algorithms to print larger numbers. |
210 | * One is generic: divide by 1000000000 and repeatedly print | |
211 | * groups of (up to) 9 digits. It's conceptually simple, | |
212 | * but requires a (unsigned long long) / 1000000000 division. | |
213 | * | |
214 | * Second algorithm splits 64-bit unsigned long long into 16-bit chunks, | |
215 | * manipulates them cleverly and generates groups of 4 decimal digits. | |
216 | * It so happens that it does NOT require long long division. | |
217 | * | |
218 | * If long is > 32 bits, division of 64-bit values is relatively easy, | |
219 | * and we will use the first algorithm. | |
220 | * If long long is > 64 bits (strange architecture with VERY large long long), | |
221 | * second algorithm can't be used, and we again use the first one. | |
222 | * | |
223 | * Else (if long is 32 bits and long long is 64 bits) we use second one. | |
224 | */ | |
7b9186f5 | 225 | |
133fd9f5 DV |
226 | #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64 |
227 | ||
228 | /* First algorithm: generic */ | |
229 | ||
230 | static | |
231 | char *put_dec(char *buf, unsigned long long n) | |
232 | { | |
233 | if (n >= 100*1000*1000) { | |
234 | while (n >= 1000*1000*1000) | |
235 | buf = put_dec_full9(buf, do_div(n, 1000*1000*1000)); | |
236 | if (n >= 100*1000*1000) | |
237 | return put_dec_full9(buf, n); | |
238 | } | |
239 | return put_dec_trunc8(buf, n); | |
4277eedd | 240 | } |
133fd9f5 DV |
241 | |
242 | #else | |
243 | ||
244 | /* Second algorithm: valid only for 64-bit long longs */ | |
245 | ||
e49317d4 | 246 | /* See comment in put_dec_full9 for choice of constants */ |
cf3b429b | 247 | static noinline_for_stack |
2359172a | 248 | void put_dec_full4(char *buf, unsigned q) |
4277eedd | 249 | { |
133fd9f5 | 250 | unsigned r; |
e49317d4 | 251 | r = (q * 0xccd) >> 15; |
2359172a | 252 | buf[0] = (q - 10 * r) + '0'; |
e49317d4 | 253 | q = (r * 0xcd) >> 11; |
2359172a | 254 | buf[1] = (r - 10 * q) + '0'; |
133fd9f5 | 255 | r = (q * 0xcd) >> 11; |
2359172a GS |
256 | buf[2] = (q - 10 * r) + '0'; |
257 | buf[3] = r + '0'; | |
258 | } | |
259 | ||
260 | /* | |
261 | * Call put_dec_full4 on x % 10000, return x / 10000. | |
262 | * The approximation x/10000 == (x * 0x346DC5D7) >> 43 | |
263 | * holds for all x < 1,128,869,999. The largest value this | |
264 | * helper will ever be asked to convert is 1,125,520,955. | |
265 | * (d1 in the put_dec code, assuming n is all-ones). | |
266 | */ | |
267 | static | |
268 | unsigned put_dec_helper4(char *buf, unsigned x) | |
269 | { | |
270 | uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43; | |
271 | ||
272 | put_dec_full4(buf, x - q * 10000); | |
273 | return q; | |
4277eedd DV |
274 | } |
275 | ||
133fd9f5 DV |
276 | /* Based on code by Douglas W. Jones found at |
277 | * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour> | |
278 | * (with permission from the author). | |
279 | * Performs no 64-bit division and hence should be fast on 32-bit machines. | |
280 | */ | |
281 | static | |
282 | char *put_dec(char *buf, unsigned long long n) | |
283 | { | |
284 | uint32_t d3, d2, d1, q, h; | |
285 | ||
286 | if (n < 100*1000*1000) | |
287 | return put_dec_trunc8(buf, n); | |
288 | ||
289 | d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */ | |
290 | h = (n >> 32); | |
291 | d2 = (h ) & 0xffff; | |
292 | d3 = (h >> 16); /* implicit "& 0xffff" */ | |
293 | ||
294 | q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff); | |
2359172a GS |
295 | q = put_dec_helper4(buf, q); |
296 | ||
297 | q += 7671 * d3 + 9496 * d2 + 6 * d1; | |
298 | q = put_dec_helper4(buf+4, q); | |
299 | ||
300 | q += 4749 * d3 + 42 * d2; | |
301 | q = put_dec_helper4(buf+8, q); | |
133fd9f5 | 302 | |
2359172a GS |
303 | q += 281 * d3; |
304 | buf += 12; | |
305 | if (q) | |
306 | buf = put_dec_trunc8(buf, q); | |
307 | else while (buf[-1] == '0') | |
133fd9f5 DV |
308 | --buf; |
309 | ||
310 | return buf; | |
311 | } | |
312 | ||
313 | #endif | |
314 | ||
1ac101a5 KH |
315 | /* |
316 | * Convert passed number to decimal string. | |
317 | * Returns the length of string. On buffer overflow, returns 0. | |
318 | * | |
319 | * If speed is not important, use snprintf(). It's easy to read the code. | |
320 | */ | |
321 | int num_to_str(char *buf, int size, unsigned long long num) | |
322 | { | |
133fd9f5 | 323 | char tmp[sizeof(num) * 3]; |
1ac101a5 KH |
324 | int idx, len; |
325 | ||
133fd9f5 DV |
326 | /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */ |
327 | if (num <= 9) { | |
328 | tmp[0] = '0' + num; | |
329 | len = 1; | |
330 | } else { | |
331 | len = put_dec(tmp, num) - tmp; | |
332 | } | |
1ac101a5 KH |
333 | |
334 | if (len > size) | |
335 | return 0; | |
336 | for (idx = 0; idx < len; ++idx) | |
337 | buf[idx] = tmp[len - idx - 1]; | |
133fd9f5 | 338 | return len; |
1ac101a5 KH |
339 | } |
340 | ||
1da177e4 LT |
341 | #define ZEROPAD 1 /* pad with zero */ |
342 | #define SIGN 2 /* unsigned/signed long */ | |
343 | #define PLUS 4 /* show plus */ | |
344 | #define SPACE 8 /* space if plus */ | |
345 | #define LEFT 16 /* left justified */ | |
b89dc5d6 BH |
346 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ |
347 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ | |
1da177e4 | 348 | |
fef20d9c FW |
349 | enum format_type { |
350 | FORMAT_TYPE_NONE, /* Just a string part */ | |
ed681a91 | 351 | FORMAT_TYPE_WIDTH, |
fef20d9c FW |
352 | FORMAT_TYPE_PRECISION, |
353 | FORMAT_TYPE_CHAR, | |
354 | FORMAT_TYPE_STR, | |
355 | FORMAT_TYPE_PTR, | |
356 | FORMAT_TYPE_PERCENT_CHAR, | |
357 | FORMAT_TYPE_INVALID, | |
358 | FORMAT_TYPE_LONG_LONG, | |
359 | FORMAT_TYPE_ULONG, | |
360 | FORMAT_TYPE_LONG, | |
a4e94ef0 Z |
361 | FORMAT_TYPE_UBYTE, |
362 | FORMAT_TYPE_BYTE, | |
fef20d9c FW |
363 | FORMAT_TYPE_USHORT, |
364 | FORMAT_TYPE_SHORT, | |
365 | FORMAT_TYPE_UINT, | |
366 | FORMAT_TYPE_INT, | |
367 | FORMAT_TYPE_NRCHARS, | |
368 | FORMAT_TYPE_SIZE_T, | |
369 | FORMAT_TYPE_PTRDIFF | |
370 | }; | |
371 | ||
372 | struct printf_spec { | |
4e310fda | 373 | u8 type; /* format_type enum */ |
ef0658f3 | 374 | u8 flags; /* flags to number() */ |
4e310fda JP |
375 | u8 base; /* number base, 8, 10 or 16 only */ |
376 | u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */ | |
377 | s16 field_width; /* width of output field */ | |
378 | s16 precision; /* # of digits/chars */ | |
fef20d9c FW |
379 | }; |
380 | ||
cf3b429b JP |
381 | static noinline_for_stack |
382 | char *number(char *buf, char *end, unsigned long long num, | |
383 | struct printf_spec spec) | |
1da177e4 | 384 | { |
9b706aee DV |
385 | /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ |
386 | static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ | |
387 | ||
388 | char tmp[66]; | |
389 | char sign; | |
390 | char locase; | |
fef20d9c | 391 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
1da177e4 | 392 | int i; |
7c203422 | 393 | bool is_zero = num == 0LL; |
1da177e4 | 394 | |
9b706aee DV |
395 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
396 | * produces same digits or (maybe lowercased) letters */ | |
fef20d9c FW |
397 | locase = (spec.flags & SMALL); |
398 | if (spec.flags & LEFT) | |
399 | spec.flags &= ~ZEROPAD; | |
1da177e4 | 400 | sign = 0; |
fef20d9c | 401 | if (spec.flags & SIGN) { |
7b9186f5 | 402 | if ((signed long long)num < 0) { |
1da177e4 | 403 | sign = '-'; |
7b9186f5 | 404 | num = -(signed long long)num; |
fef20d9c FW |
405 | spec.field_width--; |
406 | } else if (spec.flags & PLUS) { | |
1da177e4 | 407 | sign = '+'; |
fef20d9c FW |
408 | spec.field_width--; |
409 | } else if (spec.flags & SPACE) { | |
1da177e4 | 410 | sign = ' '; |
fef20d9c | 411 | spec.field_width--; |
1da177e4 LT |
412 | } |
413 | } | |
b39a7340 | 414 | if (need_pfx) { |
fef20d9c | 415 | if (spec.base == 16) |
7c203422 PC |
416 | spec.field_width -= 2; |
417 | else if (!is_zero) | |
fef20d9c | 418 | spec.field_width--; |
1da177e4 | 419 | } |
b39a7340 DV |
420 | |
421 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 | 422 | i = 0; |
133fd9f5 DV |
423 | if (num < spec.base) |
424 | tmp[i++] = digits[num] | locase; | |
4277eedd DV |
425 | /* Generic code, for any base: |
426 | else do { | |
9b706aee | 427 | tmp[i++] = (digits[do_div(num,base)] | locase); |
4277eedd DV |
428 | } while (num != 0); |
429 | */ | |
fef20d9c FW |
430 | else if (spec.base != 10) { /* 8 or 16 */ |
431 | int mask = spec.base - 1; | |
b39a7340 | 432 | int shift = 3; |
7b9186f5 AGR |
433 | |
434 | if (spec.base == 16) | |
435 | shift = 4; | |
b39a7340 | 436 | do { |
9b706aee | 437 | tmp[i++] = (digits[((unsigned char)num) & mask] | locase); |
b39a7340 DV |
438 | num >>= shift; |
439 | } while (num); | |
4277eedd DV |
440 | } else { /* base 10 */ |
441 | i = put_dec(tmp, num) - tmp; | |
442 | } | |
b39a7340 DV |
443 | |
444 | /* printing 100 using %2d gives "100", not "00" */ | |
fef20d9c FW |
445 | if (i > spec.precision) |
446 | spec.precision = i; | |
b39a7340 | 447 | /* leading space padding */ |
fef20d9c FW |
448 | spec.field_width -= spec.precision; |
449 | if (!(spec.flags & (ZEROPAD+LEFT))) { | |
7b9186f5 | 450 | while (--spec.field_width >= 0) { |
f796937a | 451 | if (buf < end) |
1da177e4 LT |
452 | *buf = ' '; |
453 | ++buf; | |
454 | } | |
455 | } | |
b39a7340 | 456 | /* sign */ |
1da177e4 | 457 | if (sign) { |
f796937a | 458 | if (buf < end) |
1da177e4 LT |
459 | *buf = sign; |
460 | ++buf; | |
461 | } | |
b39a7340 DV |
462 | /* "0x" / "0" prefix */ |
463 | if (need_pfx) { | |
7c203422 PC |
464 | if (spec.base == 16 || !is_zero) { |
465 | if (buf < end) | |
466 | *buf = '0'; | |
467 | ++buf; | |
468 | } | |
fef20d9c | 469 | if (spec.base == 16) { |
f796937a | 470 | if (buf < end) |
9b706aee | 471 | *buf = ('X' | locase); |
1da177e4 LT |
472 | ++buf; |
473 | } | |
474 | } | |
b39a7340 | 475 | /* zero or space padding */ |
fef20d9c FW |
476 | if (!(spec.flags & LEFT)) { |
477 | char c = (spec.flags & ZEROPAD) ? '0' : ' '; | |
478 | while (--spec.field_width >= 0) { | |
f796937a | 479 | if (buf < end) |
1da177e4 LT |
480 | *buf = c; |
481 | ++buf; | |
482 | } | |
483 | } | |
b39a7340 | 484 | /* hmm even more zero padding? */ |
fef20d9c | 485 | while (i <= --spec.precision) { |
f796937a | 486 | if (buf < end) |
1da177e4 LT |
487 | *buf = '0'; |
488 | ++buf; | |
489 | } | |
b39a7340 DV |
490 | /* actual digits of result */ |
491 | while (--i >= 0) { | |
f796937a | 492 | if (buf < end) |
1da177e4 LT |
493 | *buf = tmp[i]; |
494 | ++buf; | |
495 | } | |
b39a7340 | 496 | /* trailing space padding */ |
fef20d9c | 497 | while (--spec.field_width >= 0) { |
f796937a | 498 | if (buf < end) |
1da177e4 LT |
499 | *buf = ' '; |
500 | ++buf; | |
501 | } | |
7b9186f5 | 502 | |
1da177e4 LT |
503 | return buf; |
504 | } | |
505 | ||
cf3b429b JP |
506 | static noinline_for_stack |
507 | char *string(char *buf, char *end, const char *s, struct printf_spec spec) | |
0f9bfa56 LT |
508 | { |
509 | int len, i; | |
510 | ||
511 | if ((unsigned long)s < PAGE_SIZE) | |
0f4f81dc | 512 | s = "(null)"; |
0f9bfa56 | 513 | |
fef20d9c | 514 | len = strnlen(s, spec.precision); |
0f9bfa56 | 515 | |
fef20d9c FW |
516 | if (!(spec.flags & LEFT)) { |
517 | while (len < spec.field_width--) { | |
0f9bfa56 LT |
518 | if (buf < end) |
519 | *buf = ' '; | |
520 | ++buf; | |
521 | } | |
522 | } | |
523 | for (i = 0; i < len; ++i) { | |
524 | if (buf < end) | |
525 | *buf = *s; | |
526 | ++buf; ++s; | |
527 | } | |
fef20d9c | 528 | while (len < spec.field_width--) { |
0f9bfa56 LT |
529 | if (buf < end) |
530 | *buf = ' '; | |
531 | ++buf; | |
532 | } | |
7b9186f5 | 533 | |
0f9bfa56 LT |
534 | return buf; |
535 | } | |
536 | ||
4b6ccca7 AV |
537 | static void widen(char *buf, char *end, unsigned len, unsigned spaces) |
538 | { | |
539 | size_t size; | |
540 | if (buf >= end) /* nowhere to put anything */ | |
541 | return; | |
542 | size = end - buf; | |
543 | if (size <= spaces) { | |
544 | memset(buf, ' ', size); | |
545 | return; | |
546 | } | |
547 | if (len) { | |
548 | if (len > size - spaces) | |
549 | len = size - spaces; | |
550 | memmove(buf + spaces, buf, len); | |
551 | } | |
552 | memset(buf, ' ', spaces); | |
553 | } | |
554 | ||
555 | static noinline_for_stack | |
556 | char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec, | |
557 | const char *fmt) | |
558 | { | |
559 | const char *array[4], *s; | |
560 | const struct dentry *p; | |
561 | int depth; | |
562 | int i, n; | |
563 | ||
564 | switch (fmt[1]) { | |
565 | case '2': case '3': case '4': | |
566 | depth = fmt[1] - '0'; | |
567 | break; | |
568 | default: | |
569 | depth = 1; | |
570 | } | |
571 | ||
572 | rcu_read_lock(); | |
573 | for (i = 0; i < depth; i++, d = p) { | |
574 | p = ACCESS_ONCE(d->d_parent); | |
575 | array[i] = ACCESS_ONCE(d->d_name.name); | |
576 | if (p == d) { | |
577 | if (i) | |
578 | array[i] = ""; | |
579 | i++; | |
580 | break; | |
581 | } | |
582 | } | |
583 | s = array[--i]; | |
584 | for (n = 0; n != spec.precision; n++, buf++) { | |
585 | char c = *s++; | |
586 | if (!c) { | |
587 | if (!i) | |
588 | break; | |
589 | c = '/'; | |
590 | s = array[--i]; | |
591 | } | |
592 | if (buf < end) | |
593 | *buf = c; | |
594 | } | |
595 | rcu_read_unlock(); | |
596 | if (n < spec.field_width) { | |
597 | /* we want to pad the sucker */ | |
598 | unsigned spaces = spec.field_width - n; | |
599 | if (!(spec.flags & LEFT)) { | |
600 | widen(buf - n, end, n, spaces); | |
601 | return buf + spaces; | |
602 | } | |
603 | while (spaces--) { | |
604 | if (buf < end) | |
605 | *buf = ' '; | |
606 | ++buf; | |
607 | } | |
608 | } | |
609 | return buf; | |
610 | } | |
611 | ||
cf3b429b JP |
612 | static noinline_for_stack |
613 | char *symbol_string(char *buf, char *end, void *ptr, | |
b0d33c2b | 614 | struct printf_spec spec, const char *fmt) |
0fe1ef24 | 615 | { |
b0d33c2b | 616 | unsigned long value; |
0fe1ef24 LT |
617 | #ifdef CONFIG_KALLSYMS |
618 | char sym[KSYM_SYMBOL_LEN]; | |
b0d33c2b JP |
619 | #endif |
620 | ||
621 | if (fmt[1] == 'R') | |
622 | ptr = __builtin_extract_return_addr(ptr); | |
623 | value = (unsigned long)ptr; | |
624 | ||
625 | #ifdef CONFIG_KALLSYMS | |
626 | if (*fmt == 'B') | |
0f77a8d3 | 627 | sprint_backtrace(sym, value); |
b0d33c2b | 628 | else if (*fmt != 'f' && *fmt != 's') |
0c8b946e FW |
629 | sprint_symbol(sym, value); |
630 | else | |
4796dd20 | 631 | sprint_symbol_no_offset(sym, value); |
7b9186f5 | 632 | |
fef20d9c | 633 | return string(buf, end, sym, spec); |
0fe1ef24 | 634 | #else |
7b9186f5 | 635 | spec.field_width = 2 * sizeof(void *); |
fef20d9c FW |
636 | spec.flags |= SPECIAL | SMALL | ZEROPAD; |
637 | spec.base = 16; | |
7b9186f5 | 638 | |
fef20d9c | 639 | return number(buf, end, value, spec); |
0fe1ef24 LT |
640 | #endif |
641 | } | |
642 | ||
cf3b429b JP |
643 | static noinline_for_stack |
644 | char *resource_string(char *buf, char *end, struct resource *res, | |
645 | struct printf_spec spec, const char *fmt) | |
332d2e78 LT |
646 | { |
647 | #ifndef IO_RSRC_PRINTK_SIZE | |
28405372 | 648 | #define IO_RSRC_PRINTK_SIZE 6 |
332d2e78 LT |
649 | #endif |
650 | ||
651 | #ifndef MEM_RSRC_PRINTK_SIZE | |
28405372 | 652 | #define MEM_RSRC_PRINTK_SIZE 10 |
332d2e78 | 653 | #endif |
4da0b66c | 654 | static const struct printf_spec io_spec = { |
fef20d9c | 655 | .base = 16, |
4da0b66c | 656 | .field_width = IO_RSRC_PRINTK_SIZE, |
fef20d9c FW |
657 | .precision = -1, |
658 | .flags = SPECIAL | SMALL | ZEROPAD, | |
659 | }; | |
4da0b66c BH |
660 | static const struct printf_spec mem_spec = { |
661 | .base = 16, | |
662 | .field_width = MEM_RSRC_PRINTK_SIZE, | |
663 | .precision = -1, | |
664 | .flags = SPECIAL | SMALL | ZEROPAD, | |
665 | }; | |
0f4050c7 BH |
666 | static const struct printf_spec bus_spec = { |
667 | .base = 16, | |
668 | .field_width = 2, | |
669 | .precision = -1, | |
670 | .flags = SMALL | ZEROPAD, | |
671 | }; | |
4da0b66c | 672 | static const struct printf_spec dec_spec = { |
c91d3376 BH |
673 | .base = 10, |
674 | .precision = -1, | |
675 | .flags = 0, | |
676 | }; | |
4da0b66c | 677 | static const struct printf_spec str_spec = { |
fd95541e BH |
678 | .field_width = -1, |
679 | .precision = 10, | |
680 | .flags = LEFT, | |
681 | }; | |
4da0b66c | 682 | static const struct printf_spec flag_spec = { |
fd95541e BH |
683 | .base = 16, |
684 | .precision = -1, | |
685 | .flags = SPECIAL | SMALL, | |
686 | }; | |
c7dabef8 BH |
687 | |
688 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) | |
689 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ | |
690 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) | |
691 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) | |
9d7cca04 | 692 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") |
c7dabef8 BH |
693 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") |
694 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, | |
695 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; | |
696 | ||
332d2e78 | 697 | char *p = sym, *pend = sym + sizeof(sym); |
c7dabef8 | 698 | int decode = (fmt[0] == 'R') ? 1 : 0; |
4da0b66c | 699 | const struct printf_spec *specp; |
332d2e78 LT |
700 | |
701 | *p++ = '['; | |
4da0b66c | 702 | if (res->flags & IORESOURCE_IO) { |
c7dabef8 | 703 | p = string(p, pend, "io ", str_spec); |
4da0b66c BH |
704 | specp = &io_spec; |
705 | } else if (res->flags & IORESOURCE_MEM) { | |
c7dabef8 | 706 | p = string(p, pend, "mem ", str_spec); |
4da0b66c BH |
707 | specp = &mem_spec; |
708 | } else if (res->flags & IORESOURCE_IRQ) { | |
c7dabef8 | 709 | p = string(p, pend, "irq ", str_spec); |
4da0b66c BH |
710 | specp = &dec_spec; |
711 | } else if (res->flags & IORESOURCE_DMA) { | |
c7dabef8 | 712 | p = string(p, pend, "dma ", str_spec); |
4da0b66c | 713 | specp = &dec_spec; |
0f4050c7 BH |
714 | } else if (res->flags & IORESOURCE_BUS) { |
715 | p = string(p, pend, "bus ", str_spec); | |
716 | specp = &bus_spec; | |
4da0b66c | 717 | } else { |
c7dabef8 | 718 | p = string(p, pend, "??? ", str_spec); |
4da0b66c | 719 | specp = &mem_spec; |
c7dabef8 | 720 | decode = 0; |
fd95541e | 721 | } |
4da0b66c | 722 | p = number(p, pend, res->start, *specp); |
c91d3376 BH |
723 | if (res->start != res->end) { |
724 | *p++ = '-'; | |
4da0b66c | 725 | p = number(p, pend, res->end, *specp); |
c91d3376 | 726 | } |
c7dabef8 | 727 | if (decode) { |
fd95541e BH |
728 | if (res->flags & IORESOURCE_MEM_64) |
729 | p = string(p, pend, " 64bit", str_spec); | |
730 | if (res->flags & IORESOURCE_PREFETCH) | |
731 | p = string(p, pend, " pref", str_spec); | |
9d7cca04 BH |
732 | if (res->flags & IORESOURCE_WINDOW) |
733 | p = string(p, pend, " window", str_spec); | |
fd95541e BH |
734 | if (res->flags & IORESOURCE_DISABLED) |
735 | p = string(p, pend, " disabled", str_spec); | |
c7dabef8 BH |
736 | } else { |
737 | p = string(p, pend, " flags ", str_spec); | |
738 | p = number(p, pend, res->flags, flag_spec); | |
fd95541e | 739 | } |
332d2e78 | 740 | *p++ = ']'; |
c7dabef8 | 741 | *p = '\0'; |
332d2e78 | 742 | |
fef20d9c | 743 | return string(buf, end, sym, spec); |
332d2e78 LT |
744 | } |
745 | ||
31550a16 AS |
746 | static noinline_for_stack |
747 | char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
748 | const char *fmt) | |
749 | { | |
360603a1 | 750 | int i, len = 1; /* if we pass '%ph[CDN]', field width remains |
31550a16 AS |
751 | negative value, fallback to the default */ |
752 | char separator; | |
753 | ||
754 | if (spec.field_width == 0) | |
755 | /* nothing to print */ | |
756 | return buf; | |
757 | ||
758 | if (ZERO_OR_NULL_PTR(addr)) | |
759 | /* NULL pointer */ | |
760 | return string(buf, end, NULL, spec); | |
761 | ||
762 | switch (fmt[1]) { | |
763 | case 'C': | |
764 | separator = ':'; | |
765 | break; | |
766 | case 'D': | |
767 | separator = '-'; | |
768 | break; | |
769 | case 'N': | |
770 | separator = 0; | |
771 | break; | |
772 | default: | |
773 | separator = ' '; | |
774 | break; | |
775 | } | |
776 | ||
777 | if (spec.field_width > 0) | |
778 | len = min_t(int, spec.field_width, 64); | |
779 | ||
780 | for (i = 0; i < len && buf < end - 1; i++) { | |
781 | buf = hex_byte_pack(buf, addr[i]); | |
782 | ||
783 | if (buf < end && separator && i != len - 1) | |
784 | *buf++ = separator; | |
785 | } | |
786 | ||
787 | return buf; | |
788 | } | |
789 | ||
cf3b429b JP |
790 | static noinline_for_stack |
791 | char *mac_address_string(char *buf, char *end, u8 *addr, | |
792 | struct printf_spec spec, const char *fmt) | |
dd45c9cf | 793 | { |
8a27f7c9 | 794 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
dd45c9cf HH |
795 | char *p = mac_addr; |
796 | int i; | |
bc7259a2 | 797 | char separator; |
76597ff9 | 798 | bool reversed = false; |
bc7259a2 | 799 | |
76597ff9 AE |
800 | switch (fmt[1]) { |
801 | case 'F': | |
bc7259a2 | 802 | separator = '-'; |
76597ff9 AE |
803 | break; |
804 | ||
805 | case 'R': | |
806 | reversed = true; | |
807 | /* fall through */ | |
808 | ||
809 | default: | |
bc7259a2 | 810 | separator = ':'; |
76597ff9 | 811 | break; |
bc7259a2 | 812 | } |
dd45c9cf HH |
813 | |
814 | for (i = 0; i < 6; i++) { | |
76597ff9 AE |
815 | if (reversed) |
816 | p = hex_byte_pack(p, addr[5 - i]); | |
817 | else | |
818 | p = hex_byte_pack(p, addr[i]); | |
819 | ||
8a27f7c9 | 820 | if (fmt[0] == 'M' && i != 5) |
bc7259a2 | 821 | *p++ = separator; |
dd45c9cf HH |
822 | } |
823 | *p = '\0'; | |
824 | ||
fef20d9c | 825 | return string(buf, end, mac_addr, spec); |
dd45c9cf HH |
826 | } |
827 | ||
cf3b429b JP |
828 | static noinline_for_stack |
829 | char *ip4_string(char *p, const u8 *addr, const char *fmt) | |
8a27f7c9 JP |
830 | { |
831 | int i; | |
0159f24e JP |
832 | bool leading_zeros = (fmt[0] == 'i'); |
833 | int index; | |
834 | int step; | |
835 | ||
836 | switch (fmt[2]) { | |
837 | case 'h': | |
838 | #ifdef __BIG_ENDIAN | |
839 | index = 0; | |
840 | step = 1; | |
841 | #else | |
842 | index = 3; | |
843 | step = -1; | |
844 | #endif | |
845 | break; | |
846 | case 'l': | |
847 | index = 3; | |
848 | step = -1; | |
849 | break; | |
850 | case 'n': | |
851 | case 'b': | |
852 | default: | |
853 | index = 0; | |
854 | step = 1; | |
855 | break; | |
856 | } | |
8a27f7c9 JP |
857 | for (i = 0; i < 4; i++) { |
858 | char temp[3]; /* hold each IP quad in reverse order */ | |
133fd9f5 | 859 | int digits = put_dec_trunc8(temp, addr[index]) - temp; |
8a27f7c9 JP |
860 | if (leading_zeros) { |
861 | if (digits < 3) | |
862 | *p++ = '0'; | |
863 | if (digits < 2) | |
864 | *p++ = '0'; | |
865 | } | |
866 | /* reverse the digits in the quad */ | |
867 | while (digits--) | |
868 | *p++ = temp[digits]; | |
869 | if (i < 3) | |
870 | *p++ = '.'; | |
0159f24e | 871 | index += step; |
8a27f7c9 | 872 | } |
8a27f7c9 | 873 | *p = '\0'; |
7b9186f5 | 874 | |
8a27f7c9 JP |
875 | return p; |
876 | } | |
877 | ||
cf3b429b JP |
878 | static noinline_for_stack |
879 | char *ip6_compressed_string(char *p, const char *addr) | |
689afa7d | 880 | { |
7b9186f5 | 881 | int i, j, range; |
8a27f7c9 JP |
882 | unsigned char zerolength[8]; |
883 | int longest = 1; | |
884 | int colonpos = -1; | |
885 | u16 word; | |
7b9186f5 | 886 | u8 hi, lo; |
8a27f7c9 | 887 | bool needcolon = false; |
eb78cd26 JP |
888 | bool useIPv4; |
889 | struct in6_addr in6; | |
890 | ||
891 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
892 | ||
893 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
8a27f7c9 JP |
894 | |
895 | memset(zerolength, 0, sizeof(zerolength)); | |
896 | ||
897 | if (useIPv4) | |
898 | range = 6; | |
899 | else | |
900 | range = 8; | |
901 | ||
902 | /* find position of longest 0 run */ | |
903 | for (i = 0; i < range; i++) { | |
904 | for (j = i; j < range; j++) { | |
eb78cd26 | 905 | if (in6.s6_addr16[j] != 0) |
8a27f7c9 JP |
906 | break; |
907 | zerolength[i]++; | |
908 | } | |
909 | } | |
910 | for (i = 0; i < range; i++) { | |
911 | if (zerolength[i] > longest) { | |
912 | longest = zerolength[i]; | |
913 | colonpos = i; | |
914 | } | |
915 | } | |
29cf519e JP |
916 | if (longest == 1) /* don't compress a single 0 */ |
917 | colonpos = -1; | |
689afa7d | 918 | |
8a27f7c9 JP |
919 | /* emit address */ |
920 | for (i = 0; i < range; i++) { | |
921 | if (i == colonpos) { | |
922 | if (needcolon || i == 0) | |
923 | *p++ = ':'; | |
924 | *p++ = ':'; | |
925 | needcolon = false; | |
926 | i += longest - 1; | |
927 | continue; | |
928 | } | |
929 | if (needcolon) { | |
930 | *p++ = ':'; | |
931 | needcolon = false; | |
932 | } | |
933 | /* hex u16 without leading 0s */ | |
eb78cd26 | 934 | word = ntohs(in6.s6_addr16[i]); |
8a27f7c9 JP |
935 | hi = word >> 8; |
936 | lo = word & 0xff; | |
937 | if (hi) { | |
938 | if (hi > 0x0f) | |
55036ba7 | 939 | p = hex_byte_pack(p, hi); |
8a27f7c9 JP |
940 | else |
941 | *p++ = hex_asc_lo(hi); | |
55036ba7 | 942 | p = hex_byte_pack(p, lo); |
8a27f7c9 | 943 | } |
b5ff992b | 944 | else if (lo > 0x0f) |
55036ba7 | 945 | p = hex_byte_pack(p, lo); |
8a27f7c9 JP |
946 | else |
947 | *p++ = hex_asc_lo(lo); | |
948 | needcolon = true; | |
949 | } | |
950 | ||
951 | if (useIPv4) { | |
952 | if (needcolon) | |
953 | *p++ = ':'; | |
0159f24e | 954 | p = ip4_string(p, &in6.s6_addr[12], "I4"); |
8a27f7c9 | 955 | } |
8a27f7c9 | 956 | *p = '\0'; |
7b9186f5 | 957 | |
8a27f7c9 JP |
958 | return p; |
959 | } | |
960 | ||
cf3b429b JP |
961 | static noinline_for_stack |
962 | char *ip6_string(char *p, const char *addr, const char *fmt) | |
8a27f7c9 JP |
963 | { |
964 | int i; | |
7b9186f5 | 965 | |
689afa7d | 966 | for (i = 0; i < 8; i++) { |
55036ba7 AS |
967 | p = hex_byte_pack(p, *addr++); |
968 | p = hex_byte_pack(p, *addr++); | |
8a27f7c9 | 969 | if (fmt[0] == 'I' && i != 7) |
689afa7d HH |
970 | *p++ = ':'; |
971 | } | |
972 | *p = '\0'; | |
7b9186f5 | 973 | |
8a27f7c9 JP |
974 | return p; |
975 | } | |
976 | ||
cf3b429b JP |
977 | static noinline_for_stack |
978 | char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
979 | struct printf_spec spec, const char *fmt) | |
8a27f7c9 JP |
980 | { |
981 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
982 | ||
983 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
eb78cd26 | 984 | ip6_compressed_string(ip6_addr, addr); |
8a27f7c9 | 985 | else |
eb78cd26 | 986 | ip6_string(ip6_addr, addr, fmt); |
689afa7d | 987 | |
fef20d9c | 988 | return string(buf, end, ip6_addr, spec); |
689afa7d HH |
989 | } |
990 | ||
cf3b429b JP |
991 | static noinline_for_stack |
992 | char *ip4_addr_string(char *buf, char *end, const u8 *addr, | |
993 | struct printf_spec spec, const char *fmt) | |
4aa99606 | 994 | { |
8a27f7c9 | 995 | char ip4_addr[sizeof("255.255.255.255")]; |
4aa99606 | 996 | |
0159f24e | 997 | ip4_string(ip4_addr, addr, fmt); |
4aa99606 | 998 | |
fef20d9c | 999 | return string(buf, end, ip4_addr, spec); |
4aa99606 HH |
1000 | } |
1001 | ||
10679643 DB |
1002 | static noinline_for_stack |
1003 | char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa, | |
1004 | struct printf_spec spec, const char *fmt) | |
1005 | { | |
1006 | bool have_p = false, have_s = false, have_f = false, have_c = false; | |
1007 | char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") + | |
1008 | sizeof(":12345") + sizeof("/123456789") + | |
1009 | sizeof("%1234567890")]; | |
1010 | char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr); | |
1011 | const u8 *addr = (const u8 *) &sa->sin6_addr; | |
1012 | char fmt6[2] = { fmt[0], '6' }; | |
1013 | u8 off = 0; | |
1014 | ||
1015 | fmt++; | |
1016 | while (isalpha(*++fmt)) { | |
1017 | switch (*fmt) { | |
1018 | case 'p': | |
1019 | have_p = true; | |
1020 | break; | |
1021 | case 'f': | |
1022 | have_f = true; | |
1023 | break; | |
1024 | case 's': | |
1025 | have_s = true; | |
1026 | break; | |
1027 | case 'c': | |
1028 | have_c = true; | |
1029 | break; | |
1030 | } | |
1031 | } | |
1032 | ||
1033 | if (have_p || have_s || have_f) { | |
1034 | *p = '['; | |
1035 | off = 1; | |
1036 | } | |
1037 | ||
1038 | if (fmt6[0] == 'I' && have_c) | |
1039 | p = ip6_compressed_string(ip6_addr + off, addr); | |
1040 | else | |
1041 | p = ip6_string(ip6_addr + off, addr, fmt6); | |
1042 | ||
1043 | if (have_p || have_s || have_f) | |
1044 | *p++ = ']'; | |
1045 | ||
1046 | if (have_p) { | |
1047 | *p++ = ':'; | |
1048 | p = number(p, pend, ntohs(sa->sin6_port), spec); | |
1049 | } | |
1050 | if (have_f) { | |
1051 | *p++ = '/'; | |
1052 | p = number(p, pend, ntohl(sa->sin6_flowinfo & | |
1053 | IPV6_FLOWINFO_MASK), spec); | |
1054 | } | |
1055 | if (have_s) { | |
1056 | *p++ = '%'; | |
1057 | p = number(p, pend, sa->sin6_scope_id, spec); | |
1058 | } | |
1059 | *p = '\0'; | |
1060 | ||
1061 | return string(buf, end, ip6_addr, spec); | |
1062 | } | |
1063 | ||
1064 | static noinline_for_stack | |
1065 | char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa, | |
1066 | struct printf_spec spec, const char *fmt) | |
1067 | { | |
1068 | bool have_p = false; | |
1069 | char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")]; | |
1070 | char *pend = ip4_addr + sizeof(ip4_addr); | |
1071 | const u8 *addr = (const u8 *) &sa->sin_addr.s_addr; | |
1072 | char fmt4[3] = { fmt[0], '4', 0 }; | |
1073 | ||
1074 | fmt++; | |
1075 | while (isalpha(*++fmt)) { | |
1076 | switch (*fmt) { | |
1077 | case 'p': | |
1078 | have_p = true; | |
1079 | break; | |
1080 | case 'h': | |
1081 | case 'l': | |
1082 | case 'n': | |
1083 | case 'b': | |
1084 | fmt4[2] = *fmt; | |
1085 | break; | |
1086 | } | |
1087 | } | |
1088 | ||
1089 | p = ip4_string(ip4_addr, addr, fmt4); | |
1090 | if (have_p) { | |
1091 | *p++ = ':'; | |
1092 | p = number(p, pend, ntohs(sa->sin_port), spec); | |
1093 | } | |
1094 | *p = '\0'; | |
1095 | ||
1096 | return string(buf, end, ip4_addr, spec); | |
1097 | } | |
1098 | ||
cf3b429b JP |
1099 | static noinline_for_stack |
1100 | char *uuid_string(char *buf, char *end, const u8 *addr, | |
1101 | struct printf_spec spec, const char *fmt) | |
9ac6e44e JP |
1102 | { |
1103 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; | |
1104 | char *p = uuid; | |
1105 | int i; | |
1106 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; | |
1107 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; | |
1108 | const u8 *index = be; | |
1109 | bool uc = false; | |
1110 | ||
1111 | switch (*(++fmt)) { | |
1112 | case 'L': | |
1113 | uc = true; /* fall-through */ | |
1114 | case 'l': | |
1115 | index = le; | |
1116 | break; | |
1117 | case 'B': | |
1118 | uc = true; | |
1119 | break; | |
1120 | } | |
1121 | ||
1122 | for (i = 0; i < 16; i++) { | |
55036ba7 | 1123 | p = hex_byte_pack(p, addr[index[i]]); |
9ac6e44e JP |
1124 | switch (i) { |
1125 | case 3: | |
1126 | case 5: | |
1127 | case 7: | |
1128 | case 9: | |
1129 | *p++ = '-'; | |
1130 | break; | |
1131 | } | |
1132 | } | |
1133 | ||
1134 | *p = 0; | |
1135 | ||
1136 | if (uc) { | |
1137 | p = uuid; | |
1138 | do { | |
1139 | *p = toupper(*p); | |
1140 | } while (*(++p)); | |
1141 | } | |
1142 | ||
1143 | return string(buf, end, uuid, spec); | |
1144 | } | |
1145 | ||
c8f44aff MM |
1146 | static |
1147 | char *netdev_feature_string(char *buf, char *end, const u8 *addr, | |
1148 | struct printf_spec spec) | |
1149 | { | |
1150 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
1151 | if (spec.field_width == -1) | |
1152 | spec.field_width = 2 + 2 * sizeof(netdev_features_t); | |
1153 | spec.base = 16; | |
1154 | ||
1155 | return number(buf, end, *(const netdev_features_t *)addr, spec); | |
1156 | } | |
1157 | ||
aaf07621 JP |
1158 | static noinline_for_stack |
1159 | char *address_val(char *buf, char *end, const void *addr, | |
1160 | struct printf_spec spec, const char *fmt) | |
1161 | { | |
1162 | unsigned long long num; | |
1163 | ||
1164 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
1165 | spec.base = 16; | |
1166 | ||
1167 | switch (fmt[1]) { | |
1168 | case 'd': | |
1169 | num = *(const dma_addr_t *)addr; | |
1170 | spec.field_width = sizeof(dma_addr_t) * 2 + 2; | |
1171 | break; | |
1172 | case 'p': | |
1173 | default: | |
1174 | num = *(const phys_addr_t *)addr; | |
1175 | spec.field_width = sizeof(phys_addr_t) * 2 + 2; | |
1176 | break; | |
1177 | } | |
1178 | ||
1179 | return number(buf, end, num, spec); | |
1180 | } | |
1181 | ||
411f05f1 | 1182 | int kptr_restrict __read_mostly; |
455cd5ab | 1183 | |
4d8a743c LT |
1184 | /* |
1185 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
1186 | * by an extra set of alphanumeric characters that are extended format | |
1187 | * specifiers. | |
1188 | * | |
332d2e78 LT |
1189 | * Right now we handle: |
1190 | * | |
0c8b946e FW |
1191 | * - 'F' For symbolic function descriptor pointers with offset |
1192 | * - 'f' For simple symbolic function names without offset | |
0efb4d20 SR |
1193 | * - 'S' For symbolic direct pointers with offset |
1194 | * - 's' For symbolic direct pointers without offset | |
b0d33c2b | 1195 | * - '[FfSs]R' as above with __builtin_extract_return_addr() translation |
0f77a8d3 | 1196 | * - 'B' For backtraced symbolic direct pointers with offset |
c7dabef8 BH |
1197 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] |
1198 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
dd45c9cf HH |
1199 | * - 'M' For a 6-byte MAC address, it prints the address in the |
1200 | * usual colon-separated hex notation | |
8a27f7c9 | 1201 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
bc7259a2 | 1202 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address |
c8e00060 | 1203 | * with a dash-separated hex notation |
7c59154e | 1204 | * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth) |
8a27f7c9 JP |
1205 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way |
1206 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
1207 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
10679643 DB |
1208 | * [S][pfs] |
1209 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1210 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
8a27f7c9 JP |
1211 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses |
1212 | * IPv6 omits the colons (01020304...0f) | |
1213 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
10679643 DB |
1214 | * [S][pfs] |
1215 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1216 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
1217 | * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order | |
1218 | * - 'I[6S]c' for IPv6 addresses printed as specified by | |
29cf519e | 1219 | * http://tools.ietf.org/html/rfc5952 |
9ac6e44e JP |
1220 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form |
1221 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" | |
1222 | * Options for %pU are: | |
1223 | * b big endian lower case hex (default) | |
1224 | * B big endian UPPER case hex | |
1225 | * l little endian lower case hex | |
1226 | * L little endian UPPER case hex | |
1227 | * big endian output byte order is: | |
1228 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] | |
1229 | * little endian output byte order is: | |
1230 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] | |
7db6f5fb JP |
1231 | * - 'V' For a struct va_format which contains a format string * and va_list *, |
1232 | * call vsnprintf(->format, *->va_list). | |
1233 | * Implements a "recursive vsnprintf". | |
1234 | * Do not use this feature without some mechanism to verify the | |
1235 | * correctness of the format string and va_list arguments. | |
455cd5ab | 1236 | * - 'K' For a kernel pointer that should be hidden from unprivileged users |
c8f44aff | 1237 | * - 'NF' For a netdev_features_t |
31550a16 AS |
1238 | * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with |
1239 | * a certain separator (' ' by default): | |
1240 | * C colon | |
1241 | * D dash | |
1242 | * N no separator | |
1243 | * The maximum supported length is 64 bytes of the input. Consider | |
1244 | * to use print_hex_dump() for the larger input. | |
aaf07621 JP |
1245 | * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives |
1246 | * (default assumed to be phys_addr_t, passed by reference) | |
c0d92a57 OJ |
1247 | * - 'd[234]' For a dentry name (optionally 2-4 last components) |
1248 | * - 'D[234]' Same as 'd' but for a struct file | |
9ac6e44e | 1249 | * |
332d2e78 LT |
1250 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 |
1251 | * function pointers are really function descriptors, which contain a | |
1252 | * pointer to the real address. | |
4d8a743c | 1253 | */ |
cf3b429b JP |
1254 | static noinline_for_stack |
1255 | char *pointer(const char *fmt, char *buf, char *end, void *ptr, | |
1256 | struct printf_spec spec) | |
78a8bf69 | 1257 | { |
725fe002 GL |
1258 | int default_width = 2 * sizeof(void *) + (spec.flags & SPECIAL ? 2 : 0); |
1259 | ||
9f36e2c4 | 1260 | if (!ptr && *fmt != 'K') { |
5e057981 JP |
1261 | /* |
1262 | * Print (null) with the same width as a pointer so it makes | |
1263 | * tabular output look nice. | |
1264 | */ | |
1265 | if (spec.field_width == -1) | |
725fe002 | 1266 | spec.field_width = default_width; |
fef20d9c | 1267 | return string(buf, end, "(null)", spec); |
5e057981 | 1268 | } |
d97106ab | 1269 | |
0fe1ef24 LT |
1270 | switch (*fmt) { |
1271 | case 'F': | |
0c8b946e | 1272 | case 'f': |
0fe1ef24 LT |
1273 | ptr = dereference_function_descriptor(ptr); |
1274 | /* Fallthrough */ | |
1275 | case 'S': | |
9ac6e44e | 1276 | case 's': |
0f77a8d3 | 1277 | case 'B': |
b0d33c2b | 1278 | return symbol_string(buf, end, ptr, spec, fmt); |
332d2e78 | 1279 | case 'R': |
c7dabef8 | 1280 | case 'r': |
fd95541e | 1281 | return resource_string(buf, end, ptr, spec, fmt); |
31550a16 AS |
1282 | case 'h': |
1283 | return hex_string(buf, end, ptr, spec, fmt); | |
8a27f7c9 JP |
1284 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
1285 | case 'm': /* Contiguous: 000102030405 */ | |
76597ff9 AE |
1286 | /* [mM]F (FDDI) */ |
1287 | /* [mM]R (Reverse order; Bluetooth) */ | |
8a27f7c9 JP |
1288 | return mac_address_string(buf, end, ptr, spec, fmt); |
1289 | case 'I': /* Formatted IP supported | |
1290 | * 4: 1.2.3.4 | |
1291 | * 6: 0001:0203:...:0708 | |
1292 | * 6c: 1::708 or 1::1.2.3.4 | |
1293 | */ | |
1294 | case 'i': /* Contiguous: | |
1295 | * 4: 001.002.003.004 | |
1296 | * 6: 000102...0f | |
1297 | */ | |
1298 | switch (fmt[1]) { | |
1299 | case '6': | |
1300 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
1301 | case '4': | |
1302 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
10679643 DB |
1303 | case 'S': { |
1304 | const union { | |
1305 | struct sockaddr raw; | |
1306 | struct sockaddr_in v4; | |
1307 | struct sockaddr_in6 v6; | |
1308 | } *sa = ptr; | |
1309 | ||
1310 | switch (sa->raw.sa_family) { | |
1311 | case AF_INET: | |
1312 | return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt); | |
1313 | case AF_INET6: | |
1314 | return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt); | |
1315 | default: | |
1316 | return string(buf, end, "(invalid address)", spec); | |
1317 | }} | |
8a27f7c9 | 1318 | } |
fef20d9c | 1319 | break; |
9ac6e44e JP |
1320 | case 'U': |
1321 | return uuid_string(buf, end, ptr, spec, fmt); | |
7db6f5fb | 1322 | case 'V': |
5756b76e JB |
1323 | { |
1324 | va_list va; | |
1325 | ||
1326 | va_copy(va, *((struct va_format *)ptr)->va); | |
1327 | buf += vsnprintf(buf, end > buf ? end - buf : 0, | |
1328 | ((struct va_format *)ptr)->fmt, va); | |
1329 | va_end(va); | |
1330 | return buf; | |
1331 | } | |
455cd5ab DR |
1332 | case 'K': |
1333 | /* | |
1334 | * %pK cannot be used in IRQ context because its test | |
1335 | * for CAP_SYSLOG would be meaningless. | |
1336 | */ | |
3715c530 DR |
1337 | if (kptr_restrict && (in_irq() || in_serving_softirq() || |
1338 | in_nmi())) { | |
455cd5ab | 1339 | if (spec.field_width == -1) |
725fe002 | 1340 | spec.field_width = default_width; |
455cd5ab | 1341 | return string(buf, end, "pK-error", spec); |
455cd5ab | 1342 | } |
312b4e22 RM |
1343 | |
1344 | switch (kptr_restrict) { | |
1345 | case 0: | |
1346 | /* Always print %pK values */ | |
1347 | break; | |
1348 | case 1: { | |
1349 | /* | |
1350 | * Only print the real pointer value if the current | |
1351 | * process has CAP_SYSLOG and is running with the | |
1352 | * same credentials it started with. This is because | |
1353 | * access to files is checked at open() time, but %pK | |
1354 | * checks permission at read() time. We don't want to | |
1355 | * leak pointer values if a binary opens a file using | |
1356 | * %pK and then elevates privileges before reading it. | |
1357 | */ | |
1358 | const struct cred *cred = current_cred(); | |
1359 | ||
1360 | if (!has_capability_noaudit(current, CAP_SYSLOG) || | |
1361 | !uid_eq(cred->euid, cred->uid) || | |
1362 | !gid_eq(cred->egid, cred->gid)) | |
1363 | ptr = NULL; | |
1364 | break; | |
1365 | } | |
1366 | case 2: | |
1367 | default: | |
1368 | /* Always print 0's for %pK */ | |
26297607 | 1369 | ptr = NULL; |
312b4e22 RM |
1370 | break; |
1371 | } | |
26297607 | 1372 | break; |
312b4e22 | 1373 | |
c8f44aff MM |
1374 | case 'N': |
1375 | switch (fmt[1]) { | |
1376 | case 'F': | |
1377 | return netdev_feature_string(buf, end, ptr, spec); | |
1378 | } | |
1379 | break; | |
7d799210 | 1380 | case 'a': |
aaf07621 | 1381 | return address_val(buf, end, ptr, spec, fmt); |
4b6ccca7 AV |
1382 | case 'd': |
1383 | return dentry_name(buf, end, ptr, spec, fmt); | |
1384 | case 'D': | |
1385 | return dentry_name(buf, end, | |
1386 | ((const struct file *)ptr)->f_path.dentry, | |
1387 | spec, fmt); | |
fef20d9c FW |
1388 | } |
1389 | spec.flags |= SMALL; | |
1390 | if (spec.field_width == -1) { | |
725fe002 | 1391 | spec.field_width = default_width; |
fef20d9c FW |
1392 | spec.flags |= ZEROPAD; |
1393 | } | |
1394 | spec.base = 16; | |
1395 | ||
1396 | return number(buf, end, (unsigned long) ptr, spec); | |
1397 | } | |
1398 | ||
1399 | /* | |
1400 | * Helper function to decode printf style format. | |
1401 | * Each call decode a token from the format and return the | |
1402 | * number of characters read (or likely the delta where it wants | |
1403 | * to go on the next call). | |
1404 | * The decoded token is returned through the parameters | |
1405 | * | |
1406 | * 'h', 'l', or 'L' for integer fields | |
1407 | * 'z' support added 23/7/1999 S.H. | |
1408 | * 'z' changed to 'Z' --davidm 1/25/99 | |
1409 | * 't' added for ptrdiff_t | |
1410 | * | |
1411 | * @fmt: the format string | |
1412 | * @type of the token returned | |
1413 | * @flags: various flags such as +, -, # tokens.. | |
1414 | * @field_width: overwritten width | |
1415 | * @base: base of the number (octal, hex, ...) | |
1416 | * @precision: precision of a number | |
1417 | * @qualifier: qualifier of a number (long, size_t, ...) | |
1418 | */ | |
cf3b429b JP |
1419 | static noinline_for_stack |
1420 | int format_decode(const char *fmt, struct printf_spec *spec) | |
fef20d9c FW |
1421 | { |
1422 | const char *start = fmt; | |
fef20d9c FW |
1423 | |
1424 | /* we finished early by reading the field width */ | |
ed681a91 | 1425 | if (spec->type == FORMAT_TYPE_WIDTH) { |
fef20d9c FW |
1426 | if (spec->field_width < 0) { |
1427 | spec->field_width = -spec->field_width; | |
1428 | spec->flags |= LEFT; | |
1429 | } | |
1430 | spec->type = FORMAT_TYPE_NONE; | |
1431 | goto precision; | |
1432 | } | |
1433 | ||
1434 | /* we finished early by reading the precision */ | |
1435 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
1436 | if (spec->precision < 0) | |
1437 | spec->precision = 0; | |
1438 | ||
1439 | spec->type = FORMAT_TYPE_NONE; | |
1440 | goto qualifier; | |
1441 | } | |
1442 | ||
1443 | /* By default */ | |
1444 | spec->type = FORMAT_TYPE_NONE; | |
1445 | ||
1446 | for (; *fmt ; ++fmt) { | |
1447 | if (*fmt == '%') | |
1448 | break; | |
1449 | } | |
1450 | ||
1451 | /* Return the current non-format string */ | |
1452 | if (fmt != start || !*fmt) | |
1453 | return fmt - start; | |
1454 | ||
1455 | /* Process flags */ | |
1456 | spec->flags = 0; | |
1457 | ||
1458 | while (1) { /* this also skips first '%' */ | |
1459 | bool found = true; | |
1460 | ||
1461 | ++fmt; | |
1462 | ||
1463 | switch (*fmt) { | |
1464 | case '-': spec->flags |= LEFT; break; | |
1465 | case '+': spec->flags |= PLUS; break; | |
1466 | case ' ': spec->flags |= SPACE; break; | |
1467 | case '#': spec->flags |= SPECIAL; break; | |
1468 | case '0': spec->flags |= ZEROPAD; break; | |
1469 | default: found = false; | |
1470 | } | |
1471 | ||
1472 | if (!found) | |
1473 | break; | |
1474 | } | |
1475 | ||
1476 | /* get field width */ | |
1477 | spec->field_width = -1; | |
1478 | ||
1479 | if (isdigit(*fmt)) | |
1480 | spec->field_width = skip_atoi(&fmt); | |
1481 | else if (*fmt == '*') { | |
1482 | /* it's the next argument */ | |
ed681a91 | 1483 | spec->type = FORMAT_TYPE_WIDTH; |
fef20d9c FW |
1484 | return ++fmt - start; |
1485 | } | |
1486 | ||
1487 | precision: | |
1488 | /* get the precision */ | |
1489 | spec->precision = -1; | |
1490 | if (*fmt == '.') { | |
1491 | ++fmt; | |
1492 | if (isdigit(*fmt)) { | |
1493 | spec->precision = skip_atoi(&fmt); | |
1494 | if (spec->precision < 0) | |
1495 | spec->precision = 0; | |
1496 | } else if (*fmt == '*') { | |
1497 | /* it's the next argument */ | |
adf26f84 | 1498 | spec->type = FORMAT_TYPE_PRECISION; |
fef20d9c FW |
1499 | return ++fmt - start; |
1500 | } | |
1501 | } | |
1502 | ||
1503 | qualifier: | |
1504 | /* get the conversion qualifier */ | |
1505 | spec->qualifier = -1; | |
75fb8f26 AS |
1506 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
1507 | _tolower(*fmt) == 'z' || *fmt == 't') { | |
a4e94ef0 Z |
1508 | spec->qualifier = *fmt++; |
1509 | if (unlikely(spec->qualifier == *fmt)) { | |
1510 | if (spec->qualifier == 'l') { | |
1511 | spec->qualifier = 'L'; | |
1512 | ++fmt; | |
1513 | } else if (spec->qualifier == 'h') { | |
1514 | spec->qualifier = 'H'; | |
1515 | ++fmt; | |
1516 | } | |
fef20d9c FW |
1517 | } |
1518 | } | |
1519 | ||
1520 | /* default base */ | |
1521 | spec->base = 10; | |
1522 | switch (*fmt) { | |
1523 | case 'c': | |
1524 | spec->type = FORMAT_TYPE_CHAR; | |
1525 | return ++fmt - start; | |
1526 | ||
1527 | case 's': | |
1528 | spec->type = FORMAT_TYPE_STR; | |
1529 | return ++fmt - start; | |
1530 | ||
1531 | case 'p': | |
1532 | spec->type = FORMAT_TYPE_PTR; | |
1533 | return fmt - start; | |
1534 | /* skip alnum */ | |
1535 | ||
1536 | case 'n': | |
1537 | spec->type = FORMAT_TYPE_NRCHARS; | |
1538 | return ++fmt - start; | |
1539 | ||
1540 | case '%': | |
1541 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
1542 | return ++fmt - start; | |
1543 | ||
1544 | /* integer number formats - set up the flags and "break" */ | |
1545 | case 'o': | |
1546 | spec->base = 8; | |
1547 | break; | |
1548 | ||
1549 | case 'x': | |
1550 | spec->flags |= SMALL; | |
1551 | ||
1552 | case 'X': | |
1553 | spec->base = 16; | |
1554 | break; | |
1555 | ||
1556 | case 'd': | |
1557 | case 'i': | |
39e874f8 | 1558 | spec->flags |= SIGN; |
fef20d9c | 1559 | case 'u': |
4aa99606 | 1560 | break; |
fef20d9c FW |
1561 | |
1562 | default: | |
1563 | spec->type = FORMAT_TYPE_INVALID; | |
1564 | return fmt - start; | |
0fe1ef24 | 1565 | } |
fef20d9c FW |
1566 | |
1567 | if (spec->qualifier == 'L') | |
1568 | spec->type = FORMAT_TYPE_LONG_LONG; | |
1569 | else if (spec->qualifier == 'l') { | |
39e874f8 | 1570 | if (spec->flags & SIGN) |
fef20d9c FW |
1571 | spec->type = FORMAT_TYPE_LONG; |
1572 | else | |
1573 | spec->type = FORMAT_TYPE_ULONG; | |
75fb8f26 | 1574 | } else if (_tolower(spec->qualifier) == 'z') { |
fef20d9c FW |
1575 | spec->type = FORMAT_TYPE_SIZE_T; |
1576 | } else if (spec->qualifier == 't') { | |
1577 | spec->type = FORMAT_TYPE_PTRDIFF; | |
a4e94ef0 Z |
1578 | } else if (spec->qualifier == 'H') { |
1579 | if (spec->flags & SIGN) | |
1580 | spec->type = FORMAT_TYPE_BYTE; | |
1581 | else | |
1582 | spec->type = FORMAT_TYPE_UBYTE; | |
fef20d9c | 1583 | } else if (spec->qualifier == 'h') { |
39e874f8 | 1584 | if (spec->flags & SIGN) |
fef20d9c FW |
1585 | spec->type = FORMAT_TYPE_SHORT; |
1586 | else | |
1587 | spec->type = FORMAT_TYPE_USHORT; | |
1588 | } else { | |
39e874f8 | 1589 | if (spec->flags & SIGN) |
fef20d9c FW |
1590 | spec->type = FORMAT_TYPE_INT; |
1591 | else | |
1592 | spec->type = FORMAT_TYPE_UINT; | |
78a8bf69 | 1593 | } |
fef20d9c FW |
1594 | |
1595 | return ++fmt - start; | |
78a8bf69 LT |
1596 | } |
1597 | ||
1da177e4 LT |
1598 | /** |
1599 | * vsnprintf - Format a string and place it in a buffer | |
1600 | * @buf: The buffer to place the result into | |
1601 | * @size: The size of the buffer, including the trailing null space | |
1602 | * @fmt: The format string to use | |
1603 | * @args: Arguments for the format string | |
1604 | * | |
20036fdc | 1605 | * This function follows C99 vsnprintf, but has some extensions: |
91adcd2c SR |
1606 | * %pS output the name of a text symbol with offset |
1607 | * %ps output the name of a text symbol without offset | |
0c8b946e FW |
1608 | * %pF output the name of a function pointer with its offset |
1609 | * %pf output the name of a function pointer without its offset | |
0f77a8d3 | 1610 | * %pB output the name of a backtrace symbol with its offset |
8a79503a UKK |
1611 | * %pR output the address range in a struct resource with decoded flags |
1612 | * %pr output the address range in a struct resource with raw flags | |
1613 | * %pM output a 6-byte MAC address with colons | |
7c59154e AS |
1614 | * %pMR output a 6-byte MAC address with colons in reversed order |
1615 | * %pMF output a 6-byte MAC address with dashes | |
8a79503a | 1616 | * %pm output a 6-byte MAC address without colons |
7c59154e | 1617 | * %pmR output a 6-byte MAC address without colons in reversed order |
8a79503a UKK |
1618 | * %pI4 print an IPv4 address without leading zeros |
1619 | * %pi4 print an IPv4 address with leading zeros | |
1620 | * %pI6 print an IPv6 address with colons | |
1621 | * %pi6 print an IPv6 address without colons | |
f996f208 | 1622 | * %pI6c print an IPv6 address as specified by RFC 5952 |
10679643 DB |
1623 | * %pIS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address |
1624 | * %piS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address | |
8a79503a UKK |
1625 | * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper |
1626 | * case. | |
31550a16 AS |
1627 | * %*ph[CDN] a variable-length hex string with a separator (supports up to 64 |
1628 | * bytes of the input) | |
0efb4d20 | 1629 | * %n is ignored |
20036fdc | 1630 | * |
80f548e0 AM |
1631 | * ** Please update Documentation/printk-formats.txt when making changes ** |
1632 | * | |
1da177e4 LT |
1633 | * The return value is the number of characters which would |
1634 | * be generated for the given input, excluding the trailing | |
1635 | * '\0', as per ISO C99. If you want to have the exact | |
1636 | * number of characters written into @buf as return value | |
72fd4a35 | 1637 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
1638 | * return is greater than or equal to @size, the resulting |
1639 | * string is truncated. | |
1640 | * | |
ba1835eb | 1641 | * If you're not already dealing with a va_list consider using snprintf(). |
1da177e4 LT |
1642 | */ |
1643 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1644 | { | |
1da177e4 | 1645 | unsigned long long num; |
d4be151b | 1646 | char *str, *end; |
fef20d9c | 1647 | struct printf_spec spec = {0}; |
1da177e4 | 1648 | |
f796937a JF |
1649 | /* Reject out-of-range values early. Large positive sizes are |
1650 | used for unknown buffer sizes. */ | |
2f30b1f9 | 1651 | if (WARN_ON_ONCE((int) size < 0)) |
1da177e4 | 1652 | return 0; |
1da177e4 LT |
1653 | |
1654 | str = buf; | |
f796937a | 1655 | end = buf + size; |
1da177e4 | 1656 | |
f796937a JF |
1657 | /* Make sure end is always >= buf */ |
1658 | if (end < buf) { | |
1659 | end = ((void *)-1); | |
1660 | size = end - buf; | |
1da177e4 LT |
1661 | } |
1662 | ||
fef20d9c FW |
1663 | while (*fmt) { |
1664 | const char *old_fmt = fmt; | |
d4be151b | 1665 | int read = format_decode(fmt, &spec); |
1da177e4 | 1666 | |
fef20d9c | 1667 | fmt += read; |
1da177e4 | 1668 | |
fef20d9c FW |
1669 | switch (spec.type) { |
1670 | case FORMAT_TYPE_NONE: { | |
1671 | int copy = read; | |
1672 | if (str < end) { | |
1673 | if (copy > end - str) | |
1674 | copy = end - str; | |
1675 | memcpy(str, old_fmt, copy); | |
1da177e4 | 1676 | } |
fef20d9c FW |
1677 | str += read; |
1678 | break; | |
1da177e4 LT |
1679 | } |
1680 | ||
ed681a91 | 1681 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1682 | spec.field_width = va_arg(args, int); |
1683 | break; | |
1da177e4 | 1684 | |
fef20d9c FW |
1685 | case FORMAT_TYPE_PRECISION: |
1686 | spec.precision = va_arg(args, int); | |
1687 | break; | |
1da177e4 | 1688 | |
d4be151b AGR |
1689 | case FORMAT_TYPE_CHAR: { |
1690 | char c; | |
1691 | ||
fef20d9c FW |
1692 | if (!(spec.flags & LEFT)) { |
1693 | while (--spec.field_width > 0) { | |
f796937a | 1694 | if (str < end) |
1da177e4 LT |
1695 | *str = ' '; |
1696 | ++str; | |
1da177e4 | 1697 | |
fef20d9c FW |
1698 | } |
1699 | } | |
1700 | c = (unsigned char) va_arg(args, int); | |
1701 | if (str < end) | |
1702 | *str = c; | |
1703 | ++str; | |
1704 | while (--spec.field_width > 0) { | |
f796937a | 1705 | if (str < end) |
fef20d9c | 1706 | *str = ' '; |
1da177e4 | 1707 | ++str; |
fef20d9c FW |
1708 | } |
1709 | break; | |
d4be151b | 1710 | } |
1da177e4 | 1711 | |
fef20d9c FW |
1712 | case FORMAT_TYPE_STR: |
1713 | str = string(str, end, va_arg(args, char *), spec); | |
1714 | break; | |
1da177e4 | 1715 | |
fef20d9c FW |
1716 | case FORMAT_TYPE_PTR: |
1717 | str = pointer(fmt+1, str, end, va_arg(args, void *), | |
1718 | spec); | |
1719 | while (isalnum(*fmt)) | |
1720 | fmt++; | |
1721 | break; | |
1da177e4 | 1722 | |
fef20d9c FW |
1723 | case FORMAT_TYPE_PERCENT_CHAR: |
1724 | if (str < end) | |
1725 | *str = '%'; | |
1726 | ++str; | |
1727 | break; | |
1da177e4 | 1728 | |
fef20d9c FW |
1729 | case FORMAT_TYPE_INVALID: |
1730 | if (str < end) | |
1731 | *str = '%'; | |
1732 | ++str; | |
fef20d9c FW |
1733 | break; |
1734 | ||
1735 | case FORMAT_TYPE_NRCHARS: { | |
9196436a KC |
1736 | /* |
1737 | * Since %n poses a greater security risk than | |
1738 | * utility, ignore %n and skip its argument. | |
1739 | */ | |
1740 | void *skip_arg; | |
1741 | ||
1742 | WARN_ONCE(1, "Please remove ignored %%n in '%s'\n", | |
1743 | old_fmt); | |
1744 | ||
1745 | skip_arg = va_arg(args, void *); | |
fef20d9c | 1746 | break; |
1da177e4 | 1747 | } |
fef20d9c FW |
1748 | |
1749 | default: | |
1750 | switch (spec.type) { | |
1751 | case FORMAT_TYPE_LONG_LONG: | |
1752 | num = va_arg(args, long long); | |
1753 | break; | |
1754 | case FORMAT_TYPE_ULONG: | |
1755 | num = va_arg(args, unsigned long); | |
1756 | break; | |
1757 | case FORMAT_TYPE_LONG: | |
1758 | num = va_arg(args, long); | |
1759 | break; | |
1760 | case FORMAT_TYPE_SIZE_T: | |
ef124960 JG |
1761 | if (spec.flags & SIGN) |
1762 | num = va_arg(args, ssize_t); | |
1763 | else | |
1764 | num = va_arg(args, size_t); | |
fef20d9c FW |
1765 | break; |
1766 | case FORMAT_TYPE_PTRDIFF: | |
1767 | num = va_arg(args, ptrdiff_t); | |
1768 | break; | |
a4e94ef0 Z |
1769 | case FORMAT_TYPE_UBYTE: |
1770 | num = (unsigned char) va_arg(args, int); | |
1771 | break; | |
1772 | case FORMAT_TYPE_BYTE: | |
1773 | num = (signed char) va_arg(args, int); | |
1774 | break; | |
fef20d9c FW |
1775 | case FORMAT_TYPE_USHORT: |
1776 | num = (unsigned short) va_arg(args, int); | |
1777 | break; | |
1778 | case FORMAT_TYPE_SHORT: | |
1779 | num = (short) va_arg(args, int); | |
1780 | break; | |
39e874f8 FW |
1781 | case FORMAT_TYPE_INT: |
1782 | num = (int) va_arg(args, int); | |
fef20d9c FW |
1783 | break; |
1784 | default: | |
1785 | num = va_arg(args, unsigned int); | |
1786 | } | |
1787 | ||
1788 | str = number(str, end, num, spec); | |
1da177e4 | 1789 | } |
1da177e4 | 1790 | } |
fef20d9c | 1791 | |
f796937a JF |
1792 | if (size > 0) { |
1793 | if (str < end) | |
1794 | *str = '\0'; | |
1795 | else | |
0a6047ee | 1796 | end[-1] = '\0'; |
f796937a | 1797 | } |
fef20d9c | 1798 | |
f796937a | 1799 | /* the trailing null byte doesn't count towards the total */ |
1da177e4 | 1800 | return str-buf; |
fef20d9c | 1801 | |
1da177e4 | 1802 | } |
1da177e4 LT |
1803 | EXPORT_SYMBOL(vsnprintf); |
1804 | ||
1805 | /** | |
1806 | * vscnprintf - Format a string and place it in a buffer | |
1807 | * @buf: The buffer to place the result into | |
1808 | * @size: The size of the buffer, including the trailing null space | |
1809 | * @fmt: The format string to use | |
1810 | * @args: Arguments for the format string | |
1811 | * | |
1812 | * The return value is the number of characters which have been written into | |
b921c69f | 1813 | * the @buf not including the trailing '\0'. If @size is == 0 the function |
1da177e4 LT |
1814 | * returns 0. |
1815 | * | |
ba1835eb | 1816 | * If you're not already dealing with a va_list consider using scnprintf(). |
20036fdc AK |
1817 | * |
1818 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1819 | */ |
1820 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1821 | { | |
1822 | int i; | |
1823 | ||
7b9186f5 AGR |
1824 | i = vsnprintf(buf, size, fmt, args); |
1825 | ||
b921c69f AA |
1826 | if (likely(i < size)) |
1827 | return i; | |
1828 | if (size != 0) | |
1829 | return size - 1; | |
1830 | return 0; | |
1da177e4 | 1831 | } |
1da177e4 LT |
1832 | EXPORT_SYMBOL(vscnprintf); |
1833 | ||
1834 | /** | |
1835 | * snprintf - Format a string and place it in a buffer | |
1836 | * @buf: The buffer to place the result into | |
1837 | * @size: The size of the buffer, including the trailing null space | |
1838 | * @fmt: The format string to use | |
1839 | * @...: Arguments for the format string | |
1840 | * | |
1841 | * The return value is the number of characters which would be | |
1842 | * generated for the given input, excluding the trailing null, | |
1843 | * as per ISO C99. If the return is greater than or equal to | |
1844 | * @size, the resulting string is truncated. | |
20036fdc AK |
1845 | * |
1846 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 1847 | */ |
7b9186f5 | 1848 | int snprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
1849 | { |
1850 | va_list args; | |
1851 | int i; | |
1852 | ||
1853 | va_start(args, fmt); | |
7b9186f5 | 1854 | i = vsnprintf(buf, size, fmt, args); |
1da177e4 | 1855 | va_end(args); |
7b9186f5 | 1856 | |
1da177e4 LT |
1857 | return i; |
1858 | } | |
1da177e4 LT |
1859 | EXPORT_SYMBOL(snprintf); |
1860 | ||
1861 | /** | |
1862 | * scnprintf - Format a string and place it in a buffer | |
1863 | * @buf: The buffer to place the result into | |
1864 | * @size: The size of the buffer, including the trailing null space | |
1865 | * @fmt: The format string to use | |
1866 | * @...: Arguments for the format string | |
1867 | * | |
1868 | * The return value is the number of characters written into @buf not including | |
b903c0b8 | 1869 | * the trailing '\0'. If @size is == 0 the function returns 0. |
1da177e4 LT |
1870 | */ |
1871 | ||
7b9186f5 | 1872 | int scnprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
1873 | { |
1874 | va_list args; | |
1875 | int i; | |
1876 | ||
1877 | va_start(args, fmt); | |
b921c69f | 1878 | i = vscnprintf(buf, size, fmt, args); |
1da177e4 | 1879 | va_end(args); |
7b9186f5 | 1880 | |
b921c69f | 1881 | return i; |
1da177e4 LT |
1882 | } |
1883 | EXPORT_SYMBOL(scnprintf); | |
1884 | ||
1885 | /** | |
1886 | * vsprintf - Format a string and place it in a buffer | |
1887 | * @buf: The buffer to place the result into | |
1888 | * @fmt: The format string to use | |
1889 | * @args: Arguments for the format string | |
1890 | * | |
1891 | * The function returns the number of characters written | |
72fd4a35 | 1892 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
1893 | * buffer overflows. |
1894 | * | |
ba1835eb | 1895 | * If you're not already dealing with a va_list consider using sprintf(). |
20036fdc AK |
1896 | * |
1897 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1898 | */ |
1899 | int vsprintf(char *buf, const char *fmt, va_list args) | |
1900 | { | |
1901 | return vsnprintf(buf, INT_MAX, fmt, args); | |
1902 | } | |
1da177e4 LT |
1903 | EXPORT_SYMBOL(vsprintf); |
1904 | ||
1905 | /** | |
1906 | * sprintf - Format a string and place it in a buffer | |
1907 | * @buf: The buffer to place the result into | |
1908 | * @fmt: The format string to use | |
1909 | * @...: Arguments for the format string | |
1910 | * | |
1911 | * The function returns the number of characters written | |
72fd4a35 | 1912 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 | 1913 | * buffer overflows. |
20036fdc AK |
1914 | * |
1915 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 1916 | */ |
7b9186f5 | 1917 | int sprintf(char *buf, const char *fmt, ...) |
1da177e4 LT |
1918 | { |
1919 | va_list args; | |
1920 | int i; | |
1921 | ||
1922 | va_start(args, fmt); | |
7b9186f5 | 1923 | i = vsnprintf(buf, INT_MAX, fmt, args); |
1da177e4 | 1924 | va_end(args); |
7b9186f5 | 1925 | |
1da177e4 LT |
1926 | return i; |
1927 | } | |
1da177e4 LT |
1928 | EXPORT_SYMBOL(sprintf); |
1929 | ||
4370aa4a LJ |
1930 | #ifdef CONFIG_BINARY_PRINTF |
1931 | /* | |
1932 | * bprintf service: | |
1933 | * vbin_printf() - VA arguments to binary data | |
1934 | * bstr_printf() - Binary data to text string | |
1935 | */ | |
1936 | ||
1937 | /** | |
1938 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
1939 | * @bin_buf: The buffer to place args' binary value | |
1940 | * @size: The size of the buffer(by words(32bits), not characters) | |
1941 | * @fmt: The format string to use | |
1942 | * @args: Arguments for the format string | |
1943 | * | |
1944 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
1945 | * is skiped. | |
1946 | * | |
1947 | * The return value is the number of words(32bits) which would be generated for | |
1948 | * the given input. | |
1949 | * | |
1950 | * NOTE: | |
1951 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
1952 | * valid for bstr_printf(). | |
1953 | */ | |
1954 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
1955 | { | |
fef20d9c | 1956 | struct printf_spec spec = {0}; |
4370aa4a | 1957 | char *str, *end; |
4370aa4a LJ |
1958 | |
1959 | str = (char *)bin_buf; | |
1960 | end = (char *)(bin_buf + size); | |
1961 | ||
1962 | #define save_arg(type) \ | |
1963 | do { \ | |
1964 | if (sizeof(type) == 8) { \ | |
1965 | unsigned long long value; \ | |
1966 | str = PTR_ALIGN(str, sizeof(u32)); \ | |
1967 | value = va_arg(args, unsigned long long); \ | |
1968 | if (str + sizeof(type) <= end) { \ | |
1969 | *(u32 *)str = *(u32 *)&value; \ | |
1970 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ | |
1971 | } \ | |
1972 | } else { \ | |
1973 | unsigned long value; \ | |
1974 | str = PTR_ALIGN(str, sizeof(type)); \ | |
1975 | value = va_arg(args, int); \ | |
1976 | if (str + sizeof(type) <= end) \ | |
1977 | *(typeof(type) *)str = (type)value; \ | |
1978 | } \ | |
1979 | str += sizeof(type); \ | |
1980 | } while (0) | |
1981 | ||
fef20d9c | 1982 | while (*fmt) { |
d4be151b | 1983 | int read = format_decode(fmt, &spec); |
4370aa4a | 1984 | |
fef20d9c | 1985 | fmt += read; |
4370aa4a | 1986 | |
fef20d9c FW |
1987 | switch (spec.type) { |
1988 | case FORMAT_TYPE_NONE: | |
d4be151b AGR |
1989 | case FORMAT_TYPE_INVALID: |
1990 | case FORMAT_TYPE_PERCENT_CHAR: | |
fef20d9c FW |
1991 | break; |
1992 | ||
ed681a91 | 1993 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1994 | case FORMAT_TYPE_PRECISION: |
1995 | save_arg(int); | |
1996 | break; | |
1997 | ||
1998 | case FORMAT_TYPE_CHAR: | |
4370aa4a | 1999 | save_arg(char); |
fef20d9c FW |
2000 | break; |
2001 | ||
2002 | case FORMAT_TYPE_STR: { | |
4370aa4a LJ |
2003 | const char *save_str = va_arg(args, char *); |
2004 | size_t len; | |
6c356634 | 2005 | |
4370aa4a LJ |
2006 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE |
2007 | || (unsigned long)save_str < PAGE_SIZE) | |
0f4f81dc | 2008 | save_str = "(null)"; |
6c356634 AGR |
2009 | len = strlen(save_str) + 1; |
2010 | if (str + len < end) | |
2011 | memcpy(str, save_str, len); | |
2012 | str += len; | |
fef20d9c | 2013 | break; |
4370aa4a | 2014 | } |
fef20d9c FW |
2015 | |
2016 | case FORMAT_TYPE_PTR: | |
4370aa4a LJ |
2017 | save_arg(void *); |
2018 | /* skip all alphanumeric pointer suffixes */ | |
fef20d9c | 2019 | while (isalnum(*fmt)) |
4370aa4a | 2020 | fmt++; |
fef20d9c FW |
2021 | break; |
2022 | ||
fef20d9c | 2023 | case FORMAT_TYPE_NRCHARS: { |
4370aa4a | 2024 | /* skip %n 's argument */ |
ef0658f3 | 2025 | u8 qualifier = spec.qualifier; |
4370aa4a LJ |
2026 | void *skip_arg; |
2027 | if (qualifier == 'l') | |
2028 | skip_arg = va_arg(args, long *); | |
75fb8f26 | 2029 | else if (_tolower(qualifier) == 'z') |
4370aa4a LJ |
2030 | skip_arg = va_arg(args, size_t *); |
2031 | else | |
2032 | skip_arg = va_arg(args, int *); | |
fef20d9c | 2033 | break; |
4370aa4a | 2034 | } |
fef20d9c FW |
2035 | |
2036 | default: | |
2037 | switch (spec.type) { | |
2038 | ||
2039 | case FORMAT_TYPE_LONG_LONG: | |
4370aa4a | 2040 | save_arg(long long); |
fef20d9c FW |
2041 | break; |
2042 | case FORMAT_TYPE_ULONG: | |
2043 | case FORMAT_TYPE_LONG: | |
4370aa4a | 2044 | save_arg(unsigned long); |
fef20d9c FW |
2045 | break; |
2046 | case FORMAT_TYPE_SIZE_T: | |
4370aa4a | 2047 | save_arg(size_t); |
fef20d9c FW |
2048 | break; |
2049 | case FORMAT_TYPE_PTRDIFF: | |
4370aa4a | 2050 | save_arg(ptrdiff_t); |
fef20d9c | 2051 | break; |
a4e94ef0 Z |
2052 | case FORMAT_TYPE_UBYTE: |
2053 | case FORMAT_TYPE_BYTE: | |
2054 | save_arg(char); | |
2055 | break; | |
fef20d9c FW |
2056 | case FORMAT_TYPE_USHORT: |
2057 | case FORMAT_TYPE_SHORT: | |
4370aa4a | 2058 | save_arg(short); |
fef20d9c FW |
2059 | break; |
2060 | default: | |
4370aa4a | 2061 | save_arg(int); |
fef20d9c | 2062 | } |
4370aa4a LJ |
2063 | } |
2064 | } | |
fef20d9c | 2065 | |
7b9186f5 | 2066 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
fef20d9c | 2067 | #undef save_arg |
4370aa4a LJ |
2068 | } |
2069 | EXPORT_SYMBOL_GPL(vbin_printf); | |
2070 | ||
2071 | /** | |
2072 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
2073 | * @buf: The buffer to place the result into | |
2074 | * @size: The size of the buffer, including the trailing null space | |
2075 | * @fmt: The format string to use | |
2076 | * @bin_buf: Binary arguments for the format string | |
2077 | * | |
2078 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
2079 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
2080 | * a binary buffer that generated by vbin_printf. | |
2081 | * | |
2082 | * The format follows C99 vsnprintf, but has some extensions: | |
0efb4d20 | 2083 | * see vsnprintf comment for details. |
4370aa4a LJ |
2084 | * |
2085 | * The return value is the number of characters which would | |
2086 | * be generated for the given input, excluding the trailing | |
2087 | * '\0', as per ISO C99. If you want to have the exact | |
2088 | * number of characters written into @buf as return value | |
2089 | * (not including the trailing '\0'), use vscnprintf(). If the | |
2090 | * return is greater than or equal to @size, the resulting | |
2091 | * string is truncated. | |
2092 | */ | |
2093 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
2094 | { | |
fef20d9c | 2095 | struct printf_spec spec = {0}; |
d4be151b AGR |
2096 | char *str, *end; |
2097 | const char *args = (const char *)bin_buf; | |
4370aa4a | 2098 | |
2f30b1f9 | 2099 | if (WARN_ON_ONCE((int) size < 0)) |
4370aa4a | 2100 | return 0; |
4370aa4a LJ |
2101 | |
2102 | str = buf; | |
2103 | end = buf + size; | |
2104 | ||
2105 | #define get_arg(type) \ | |
2106 | ({ \ | |
2107 | typeof(type) value; \ | |
2108 | if (sizeof(type) == 8) { \ | |
2109 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
2110 | *(u32 *)&value = *(u32 *)args; \ | |
2111 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
2112 | } else { \ | |
2113 | args = PTR_ALIGN(args, sizeof(type)); \ | |
2114 | value = *(typeof(type) *)args; \ | |
2115 | } \ | |
2116 | args += sizeof(type); \ | |
2117 | value; \ | |
2118 | }) | |
2119 | ||
2120 | /* Make sure end is always >= buf */ | |
2121 | if (end < buf) { | |
2122 | end = ((void *)-1); | |
2123 | size = end - buf; | |
2124 | } | |
2125 | ||
fef20d9c | 2126 | while (*fmt) { |
fef20d9c | 2127 | const char *old_fmt = fmt; |
d4be151b | 2128 | int read = format_decode(fmt, &spec); |
4370aa4a | 2129 | |
fef20d9c | 2130 | fmt += read; |
4370aa4a | 2131 | |
fef20d9c FW |
2132 | switch (spec.type) { |
2133 | case FORMAT_TYPE_NONE: { | |
2134 | int copy = read; | |
2135 | if (str < end) { | |
2136 | if (copy > end - str) | |
2137 | copy = end - str; | |
2138 | memcpy(str, old_fmt, copy); | |
4370aa4a | 2139 | } |
fef20d9c FW |
2140 | str += read; |
2141 | break; | |
4370aa4a LJ |
2142 | } |
2143 | ||
ed681a91 | 2144 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
2145 | spec.field_width = get_arg(int); |
2146 | break; | |
4370aa4a | 2147 | |
fef20d9c FW |
2148 | case FORMAT_TYPE_PRECISION: |
2149 | spec.precision = get_arg(int); | |
2150 | break; | |
4370aa4a | 2151 | |
d4be151b AGR |
2152 | case FORMAT_TYPE_CHAR: { |
2153 | char c; | |
2154 | ||
fef20d9c FW |
2155 | if (!(spec.flags & LEFT)) { |
2156 | while (--spec.field_width > 0) { | |
4370aa4a LJ |
2157 | if (str < end) |
2158 | *str = ' '; | |
2159 | ++str; | |
2160 | } | |
2161 | } | |
2162 | c = (unsigned char) get_arg(char); | |
2163 | if (str < end) | |
2164 | *str = c; | |
2165 | ++str; | |
fef20d9c | 2166 | while (--spec.field_width > 0) { |
4370aa4a LJ |
2167 | if (str < end) |
2168 | *str = ' '; | |
2169 | ++str; | |
2170 | } | |
fef20d9c | 2171 | break; |
d4be151b | 2172 | } |
4370aa4a | 2173 | |
fef20d9c | 2174 | case FORMAT_TYPE_STR: { |
4370aa4a | 2175 | const char *str_arg = args; |
d4be151b | 2176 | args += strlen(str_arg) + 1; |
fef20d9c FW |
2177 | str = string(str, end, (char *)str_arg, spec); |
2178 | break; | |
4370aa4a LJ |
2179 | } |
2180 | ||
fef20d9c FW |
2181 | case FORMAT_TYPE_PTR: |
2182 | str = pointer(fmt+1, str, end, get_arg(void *), spec); | |
2183 | while (isalnum(*fmt)) | |
4370aa4a | 2184 | fmt++; |
fef20d9c | 2185 | break; |
4370aa4a | 2186 | |
fef20d9c | 2187 | case FORMAT_TYPE_PERCENT_CHAR: |
fef20d9c | 2188 | case FORMAT_TYPE_INVALID: |
4370aa4a LJ |
2189 | if (str < end) |
2190 | *str = '%'; | |
2191 | ++str; | |
fef20d9c FW |
2192 | break; |
2193 | ||
2194 | case FORMAT_TYPE_NRCHARS: | |
2195 | /* skip */ | |
2196 | break; | |
2197 | ||
d4be151b AGR |
2198 | default: { |
2199 | unsigned long long num; | |
2200 | ||
fef20d9c FW |
2201 | switch (spec.type) { |
2202 | ||
2203 | case FORMAT_TYPE_LONG_LONG: | |
2204 | num = get_arg(long long); | |
2205 | break; | |
2206 | case FORMAT_TYPE_ULONG: | |
fef20d9c FW |
2207 | case FORMAT_TYPE_LONG: |
2208 | num = get_arg(unsigned long); | |
2209 | break; | |
2210 | case FORMAT_TYPE_SIZE_T: | |
2211 | num = get_arg(size_t); | |
2212 | break; | |
2213 | case FORMAT_TYPE_PTRDIFF: | |
2214 | num = get_arg(ptrdiff_t); | |
2215 | break; | |
a4e94ef0 Z |
2216 | case FORMAT_TYPE_UBYTE: |
2217 | num = get_arg(unsigned char); | |
2218 | break; | |
2219 | case FORMAT_TYPE_BYTE: | |
2220 | num = get_arg(signed char); | |
2221 | break; | |
fef20d9c FW |
2222 | case FORMAT_TYPE_USHORT: |
2223 | num = get_arg(unsigned short); | |
2224 | break; | |
2225 | case FORMAT_TYPE_SHORT: | |
2226 | num = get_arg(short); | |
2227 | break; | |
2228 | case FORMAT_TYPE_UINT: | |
2229 | num = get_arg(unsigned int); | |
2230 | break; | |
2231 | default: | |
2232 | num = get_arg(int); | |
2233 | } | |
2234 | ||
2235 | str = number(str, end, num, spec); | |
d4be151b AGR |
2236 | } /* default: */ |
2237 | } /* switch(spec.type) */ | |
2238 | } /* while(*fmt) */ | |
fef20d9c | 2239 | |
4370aa4a LJ |
2240 | if (size > 0) { |
2241 | if (str < end) | |
2242 | *str = '\0'; | |
2243 | else | |
2244 | end[-1] = '\0'; | |
2245 | } | |
fef20d9c | 2246 | |
4370aa4a LJ |
2247 | #undef get_arg |
2248 | ||
2249 | /* the trailing null byte doesn't count towards the total */ | |
2250 | return str - buf; | |
2251 | } | |
2252 | EXPORT_SYMBOL_GPL(bstr_printf); | |
2253 | ||
2254 | /** | |
2255 | * bprintf - Parse a format string and place args' binary value in a buffer | |
2256 | * @bin_buf: The buffer to place args' binary value | |
2257 | * @size: The size of the buffer(by words(32bits), not characters) | |
2258 | * @fmt: The format string to use | |
2259 | * @...: Arguments for the format string | |
2260 | * | |
2261 | * The function returns the number of words(u32) written | |
2262 | * into @bin_buf. | |
2263 | */ | |
2264 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
2265 | { | |
2266 | va_list args; | |
2267 | int ret; | |
2268 | ||
2269 | va_start(args, fmt); | |
2270 | ret = vbin_printf(bin_buf, size, fmt, args); | |
2271 | va_end(args); | |
7b9186f5 | 2272 | |
4370aa4a LJ |
2273 | return ret; |
2274 | } | |
2275 | EXPORT_SYMBOL_GPL(bprintf); | |
2276 | ||
2277 | #endif /* CONFIG_BINARY_PRINTF */ | |
2278 | ||
1da177e4 LT |
2279 | /** |
2280 | * vsscanf - Unformat a buffer into a list of arguments | |
2281 | * @buf: input buffer | |
2282 | * @fmt: format of buffer | |
2283 | * @args: arguments | |
2284 | */ | |
7b9186f5 | 2285 | int vsscanf(const char *buf, const char *fmt, va_list args) |
1da177e4 LT |
2286 | { |
2287 | const char *str = buf; | |
2288 | char *next; | |
2289 | char digit; | |
2290 | int num = 0; | |
ef0658f3 | 2291 | u8 qualifier; |
53809751 JB |
2292 | unsigned int base; |
2293 | union { | |
2294 | long long s; | |
2295 | unsigned long long u; | |
2296 | } val; | |
ef0658f3 | 2297 | s16 field_width; |
d4be151b | 2298 | bool is_sign; |
1da177e4 | 2299 | |
da99075c | 2300 | while (*fmt) { |
1da177e4 LT |
2301 | /* skip any white space in format */ |
2302 | /* white space in format matchs any amount of | |
2303 | * white space, including none, in the input. | |
2304 | */ | |
2305 | if (isspace(*fmt)) { | |
e7d2860b AGR |
2306 | fmt = skip_spaces(++fmt); |
2307 | str = skip_spaces(str); | |
1da177e4 LT |
2308 | } |
2309 | ||
2310 | /* anything that is not a conversion must match exactly */ | |
2311 | if (*fmt != '%' && *fmt) { | |
2312 | if (*fmt++ != *str++) | |
2313 | break; | |
2314 | continue; | |
2315 | } | |
2316 | ||
2317 | if (!*fmt) | |
2318 | break; | |
2319 | ++fmt; | |
7b9186f5 | 2320 | |
1da177e4 LT |
2321 | /* skip this conversion. |
2322 | * advance both strings to next white space | |
2323 | */ | |
2324 | if (*fmt == '*') { | |
da99075c JB |
2325 | if (!*str) |
2326 | break; | |
8fccae2c | 2327 | while (!isspace(*fmt) && *fmt != '%' && *fmt) |
1da177e4 LT |
2328 | fmt++; |
2329 | while (!isspace(*str) && *str) | |
2330 | str++; | |
2331 | continue; | |
2332 | } | |
2333 | ||
2334 | /* get field width */ | |
2335 | field_width = -1; | |
53809751 | 2336 | if (isdigit(*fmt)) { |
1da177e4 | 2337 | field_width = skip_atoi(&fmt); |
53809751 JB |
2338 | if (field_width <= 0) |
2339 | break; | |
2340 | } | |
1da177e4 LT |
2341 | |
2342 | /* get conversion qualifier */ | |
2343 | qualifier = -1; | |
75fb8f26 AS |
2344 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
2345 | _tolower(*fmt) == 'z') { | |
1da177e4 LT |
2346 | qualifier = *fmt++; |
2347 | if (unlikely(qualifier == *fmt)) { | |
2348 | if (qualifier == 'h') { | |
2349 | qualifier = 'H'; | |
2350 | fmt++; | |
2351 | } else if (qualifier == 'l') { | |
2352 | qualifier = 'L'; | |
2353 | fmt++; | |
2354 | } | |
2355 | } | |
2356 | } | |
1da177e4 | 2357 | |
da99075c JB |
2358 | if (!*fmt) |
2359 | break; | |
2360 | ||
2361 | if (*fmt == 'n') { | |
2362 | /* return number of characters read so far */ | |
2363 | *va_arg(args, int *) = str - buf; | |
2364 | ++fmt; | |
2365 | continue; | |
2366 | } | |
2367 | ||
2368 | if (!*str) | |
1da177e4 LT |
2369 | break; |
2370 | ||
d4be151b AGR |
2371 | base = 10; |
2372 | is_sign = 0; | |
2373 | ||
7b9186f5 | 2374 | switch (*fmt++) { |
1da177e4 LT |
2375 | case 'c': |
2376 | { | |
7b9186f5 | 2377 | char *s = (char *)va_arg(args, char*); |
1da177e4 LT |
2378 | if (field_width == -1) |
2379 | field_width = 1; | |
2380 | do { | |
2381 | *s++ = *str++; | |
2382 | } while (--field_width > 0 && *str); | |
2383 | num++; | |
2384 | } | |
2385 | continue; | |
2386 | case 's': | |
2387 | { | |
7b9186f5 AGR |
2388 | char *s = (char *)va_arg(args, char *); |
2389 | if (field_width == -1) | |
4be929be | 2390 | field_width = SHRT_MAX; |
1da177e4 | 2391 | /* first, skip leading white space in buffer */ |
e7d2860b | 2392 | str = skip_spaces(str); |
1da177e4 LT |
2393 | |
2394 | /* now copy until next white space */ | |
7b9186f5 | 2395 | while (*str && !isspace(*str) && field_width--) |
1da177e4 | 2396 | *s++ = *str++; |
1da177e4 LT |
2397 | *s = '\0'; |
2398 | num++; | |
2399 | } | |
2400 | continue; | |
1da177e4 LT |
2401 | case 'o': |
2402 | base = 8; | |
2403 | break; | |
2404 | case 'x': | |
2405 | case 'X': | |
2406 | base = 16; | |
2407 | break; | |
2408 | case 'i': | |
7b9186f5 | 2409 | base = 0; |
1da177e4 LT |
2410 | case 'd': |
2411 | is_sign = 1; | |
2412 | case 'u': | |
2413 | break; | |
2414 | case '%': | |
2415 | /* looking for '%' in str */ | |
7b9186f5 | 2416 | if (*str++ != '%') |
1da177e4 LT |
2417 | return num; |
2418 | continue; | |
2419 | default: | |
2420 | /* invalid format; stop here */ | |
2421 | return num; | |
2422 | } | |
2423 | ||
2424 | /* have some sort of integer conversion. | |
2425 | * first, skip white space in buffer. | |
2426 | */ | |
e7d2860b | 2427 | str = skip_spaces(str); |
1da177e4 LT |
2428 | |
2429 | digit = *str; | |
2430 | if (is_sign && digit == '-') | |
2431 | digit = *(str + 1); | |
2432 | ||
2433 | if (!digit | |
7b9186f5 AGR |
2434 | || (base == 16 && !isxdigit(digit)) |
2435 | || (base == 10 && !isdigit(digit)) | |
2436 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
2437 | || (base == 0 && !isdigit(digit))) | |
2438 | break; | |
1da177e4 | 2439 | |
53809751 JB |
2440 | if (is_sign) |
2441 | val.s = qualifier != 'L' ? | |
2442 | simple_strtol(str, &next, base) : | |
2443 | simple_strtoll(str, &next, base); | |
2444 | else | |
2445 | val.u = qualifier != 'L' ? | |
2446 | simple_strtoul(str, &next, base) : | |
2447 | simple_strtoull(str, &next, base); | |
2448 | ||
2449 | if (field_width > 0 && next - str > field_width) { | |
2450 | if (base == 0) | |
2451 | _parse_integer_fixup_radix(str, &base); | |
2452 | while (next - str > field_width) { | |
2453 | if (is_sign) | |
2454 | val.s = div_s64(val.s, base); | |
2455 | else | |
2456 | val.u = div_u64(val.u, base); | |
2457 | --next; | |
2458 | } | |
2459 | } | |
2460 | ||
7b9186f5 | 2461 | switch (qualifier) { |
1da177e4 | 2462 | case 'H': /* that's 'hh' in format */ |
53809751 JB |
2463 | if (is_sign) |
2464 | *va_arg(args, signed char *) = val.s; | |
2465 | else | |
2466 | *va_arg(args, unsigned char *) = val.u; | |
1da177e4 LT |
2467 | break; |
2468 | case 'h': | |
53809751 JB |
2469 | if (is_sign) |
2470 | *va_arg(args, short *) = val.s; | |
2471 | else | |
2472 | *va_arg(args, unsigned short *) = val.u; | |
1da177e4 LT |
2473 | break; |
2474 | case 'l': | |
53809751 JB |
2475 | if (is_sign) |
2476 | *va_arg(args, long *) = val.s; | |
2477 | else | |
2478 | *va_arg(args, unsigned long *) = val.u; | |
1da177e4 LT |
2479 | break; |
2480 | case 'L': | |
53809751 JB |
2481 | if (is_sign) |
2482 | *va_arg(args, long long *) = val.s; | |
2483 | else | |
2484 | *va_arg(args, unsigned long long *) = val.u; | |
1da177e4 LT |
2485 | break; |
2486 | case 'Z': | |
2487 | case 'z': | |
53809751 JB |
2488 | *va_arg(args, size_t *) = val.u; |
2489 | break; | |
1da177e4 | 2490 | default: |
53809751 JB |
2491 | if (is_sign) |
2492 | *va_arg(args, int *) = val.s; | |
2493 | else | |
2494 | *va_arg(args, unsigned int *) = val.u; | |
1da177e4 LT |
2495 | break; |
2496 | } | |
2497 | num++; | |
2498 | ||
2499 | if (!next) | |
2500 | break; | |
2501 | str = next; | |
2502 | } | |
c6b40d16 | 2503 | |
1da177e4 LT |
2504 | return num; |
2505 | } | |
1da177e4 LT |
2506 | EXPORT_SYMBOL(vsscanf); |
2507 | ||
2508 | /** | |
2509 | * sscanf - Unformat a buffer into a list of arguments | |
2510 | * @buf: input buffer | |
2511 | * @fmt: formatting of buffer | |
2512 | * @...: resulting arguments | |
2513 | */ | |
7b9186f5 | 2514 | int sscanf(const char *buf, const char *fmt, ...) |
1da177e4 LT |
2515 | { |
2516 | va_list args; | |
2517 | int i; | |
2518 | ||
7b9186f5 AGR |
2519 | va_start(args, fmt); |
2520 | i = vsscanf(buf, fmt, args); | |
1da177e4 | 2521 | va_end(args); |
7b9186f5 | 2522 | |
1da177e4 LT |
2523 | return i; |
2524 | } | |
1da177e4 | 2525 | EXPORT_SYMBOL(sscanf); |