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> | |
900cca29 | 20 | #include <linux/clk-provider.h> |
8bc3bcc9 | 21 | #include <linux/module.h> /* for KSYM_SYMBOL_LEN */ |
1da177e4 LT |
22 | #include <linux/types.h> |
23 | #include <linux/string.h> | |
24 | #include <linux/ctype.h> | |
25 | #include <linux/kernel.h> | |
0fe1ef24 | 26 | #include <linux/kallsyms.h> |
53809751 | 27 | #include <linux/math64.h> |
0fe1ef24 | 28 | #include <linux/uaccess.h> |
332d2e78 | 29 | #include <linux/ioport.h> |
4b6ccca7 | 30 | #include <linux/dcache.h> |
312b4e22 | 31 | #include <linux/cred.h> |
8a27f7c9 | 32 | #include <net/addrconf.h> |
1da177e4 | 33 | |
4e57b681 | 34 | #include <asm/page.h> /* for PAGE_SIZE */ |
deac93df | 35 | #include <asm/sections.h> /* for dereference_function_descriptor() */ |
7c43d9a3 | 36 | #include <asm/byteorder.h> /* cpu_to_le16 */ |
1da177e4 | 37 | |
71dca95d | 38 | #include <linux/string_helpers.h> |
1dff46d6 | 39 | #include "kstrtox.h" |
aa46a63e | 40 | |
1da177e4 | 41 | /** |
922ac25c | 42 | * simple_strtoull - convert a string to an unsigned long long |
1da177e4 LT |
43 | * @cp: The start of the string |
44 | * @endp: A pointer to the end of the parsed string will be placed here | |
45 | * @base: The number base to use | |
462e4711 EZ |
46 | * |
47 | * This function is obsolete. Please use kstrtoull instead. | |
1da177e4 | 48 | */ |
922ac25c | 49 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
1da177e4 | 50 | { |
1dff46d6 AD |
51 | unsigned long long result; |
52 | unsigned int rv; | |
aa46a63e | 53 | |
1dff46d6 AD |
54 | cp = _parse_integer_fixup_radix(cp, &base); |
55 | rv = _parse_integer(cp, base, &result); | |
56 | /* FIXME */ | |
57 | cp += (rv & ~KSTRTOX_OVERFLOW); | |
aa46a63e | 58 | |
1da177e4 LT |
59 | if (endp) |
60 | *endp = (char *)cp; | |
7b9186f5 | 61 | |
1da177e4 LT |
62 | return result; |
63 | } | |
922ac25c | 64 | EXPORT_SYMBOL(simple_strtoull); |
1da177e4 LT |
65 | |
66 | /** | |
922ac25c | 67 | * simple_strtoul - convert a string to an unsigned long |
1da177e4 LT |
68 | * @cp: The start of the string |
69 | * @endp: A pointer to the end of the parsed string will be placed here | |
70 | * @base: The number base to use | |
462e4711 EZ |
71 | * |
72 | * This function is obsolete. Please use kstrtoul instead. | |
1da177e4 | 73 | */ |
922ac25c | 74 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
1da177e4 | 75 | { |
922ac25c | 76 | return simple_strtoull(cp, endp, base); |
1da177e4 | 77 | } |
922ac25c | 78 | EXPORT_SYMBOL(simple_strtoul); |
1da177e4 LT |
79 | |
80 | /** | |
922ac25c | 81 | * simple_strtol - convert a string to a signed long |
1da177e4 LT |
82 | * @cp: The start of the string |
83 | * @endp: A pointer to the end of the parsed string will be placed here | |
84 | * @base: The number base to use | |
462e4711 EZ |
85 | * |
86 | * This function is obsolete. Please use kstrtol instead. | |
1da177e4 | 87 | */ |
922ac25c | 88 | long simple_strtol(const char *cp, char **endp, unsigned int base) |
1da177e4 | 89 | { |
922ac25c AGR |
90 | if (*cp == '-') |
91 | return -simple_strtoul(cp + 1, endp, base); | |
7b9186f5 | 92 | |
922ac25c | 93 | return simple_strtoul(cp, endp, base); |
1da177e4 | 94 | } |
922ac25c | 95 | EXPORT_SYMBOL(simple_strtol); |
1da177e4 LT |
96 | |
97 | /** | |
98 | * simple_strtoll - convert a string to a signed long long | |
99 | * @cp: The start of the string | |
100 | * @endp: A pointer to the end of the parsed string will be placed here | |
101 | * @base: The number base to use | |
462e4711 EZ |
102 | * |
103 | * This function is obsolete. Please use kstrtoll instead. | |
1da177e4 | 104 | */ |
22d27051 | 105 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
1da177e4 | 106 | { |
7b9186f5 | 107 | if (*cp == '-') |
22d27051 | 108 | return -simple_strtoull(cp + 1, endp, base); |
7b9186f5 | 109 | |
22d27051 | 110 | return simple_strtoull(cp, endp, base); |
1da177e4 | 111 | } |
98d5ce0d | 112 | EXPORT_SYMBOL(simple_strtoll); |
1da177e4 | 113 | |
cf3b429b JP |
114 | static noinline_for_stack |
115 | int skip_atoi(const char **s) | |
1da177e4 | 116 | { |
7b9186f5 | 117 | int i = 0; |
1da177e4 | 118 | |
43e5b666 | 119 | do { |
1da177e4 | 120 | i = i*10 + *((*s)++) - '0'; |
43e5b666 | 121 | } while (isdigit(**s)); |
7b9186f5 | 122 | |
1da177e4 LT |
123 | return i; |
124 | } | |
125 | ||
7c43d9a3 RV |
126 | /* |
127 | * Decimal conversion is by far the most typical, and is used for | |
128 | * /proc and /sys data. This directly impacts e.g. top performance | |
129 | * with many processes running. We optimize it for speed by emitting | |
130 | * two characters at a time, using a 200 byte lookup table. This | |
131 | * roughly halves the number of multiplications compared to computing | |
132 | * the digits one at a time. Implementation strongly inspired by the | |
133 | * previous version, which in turn used ideas described at | |
134 | * <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission | |
135 | * from the author, Douglas W. Jones). | |
136 | * | |
137 | * It turns out there is precisely one 26 bit fixed-point | |
138 | * approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32 | |
139 | * holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual | |
140 | * range happens to be somewhat larger (x <= 1073741898), but that's | |
141 | * irrelevant for our purpose. | |
142 | * | |
143 | * For dividing a number in the range [10^4, 10^6-1] by 100, we still | |
144 | * need a 32x32->64 bit multiply, so we simply use the same constant. | |
145 | * | |
146 | * For dividing a number in the range [100, 10^4-1] by 100, there are | |
147 | * several options. The simplest is (x * 0x147b) >> 19, which is valid | |
148 | * for all x <= 43698. | |
133fd9f5 | 149 | */ |
4277eedd | 150 | |
7c43d9a3 RV |
151 | static const u16 decpair[100] = { |
152 | #define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030) | |
153 | _( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9), | |
154 | _(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19), | |
155 | _(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29), | |
156 | _(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39), | |
157 | _(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49), | |
158 | _(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59), | |
159 | _(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69), | |
160 | _(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79), | |
161 | _(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89), | |
162 | _(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99), | |
163 | #undef _ | |
164 | }; | |
165 | ||
166 | /* | |
167 | * This will print a single '0' even if r == 0, since we would | |
168 | * immediately jump to out_r where two 0s would be written and one of | |
169 | * them then discarded. This is needed by ip4_string below. All other | |
170 | * callers pass a non-zero value of r. | |
171 | */ | |
cf3b429b | 172 | static noinline_for_stack |
7c43d9a3 | 173 | char *put_dec_trunc8(char *buf, unsigned r) |
4277eedd | 174 | { |
7c43d9a3 RV |
175 | unsigned q; |
176 | ||
177 | /* 1 <= r < 10^8 */ | |
178 | if (r < 100) | |
179 | goto out_r; | |
180 | ||
181 | /* 100 <= r < 10^8 */ | |
182 | q = (r * (u64)0x28f5c29) >> 32; | |
183 | *((u16 *)buf) = decpair[r - 100*q]; | |
184 | buf += 2; | |
185 | ||
186 | /* 1 <= q < 10^6 */ | |
187 | if (q < 100) | |
188 | goto out_q; | |
189 | ||
190 | /* 100 <= q < 10^6 */ | |
191 | r = (q * (u64)0x28f5c29) >> 32; | |
192 | *((u16 *)buf) = decpair[q - 100*r]; | |
193 | buf += 2; | |
194 | ||
195 | /* 1 <= r < 10^4 */ | |
196 | if (r < 100) | |
197 | goto out_r; | |
198 | ||
199 | /* 100 <= r < 10^4 */ | |
200 | q = (r * 0x147b) >> 19; | |
201 | *((u16 *)buf) = decpair[r - 100*q]; | |
202 | buf += 2; | |
203 | out_q: | |
204 | /* 1 <= q < 100 */ | |
205 | r = q; | |
206 | out_r: | |
207 | /* 1 <= r < 100 */ | |
208 | *((u16 *)buf) = decpair[r]; | |
209 | buf += 2; | |
210 | if (buf[-1] == '0') | |
211 | buf--; | |
4277eedd DV |
212 | return buf; |
213 | } | |
133fd9f5 | 214 | |
7c43d9a3 | 215 | #if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64 |
cf3b429b | 216 | static noinline_for_stack |
7c43d9a3 | 217 | char *put_dec_full8(char *buf, unsigned r) |
4277eedd | 218 | { |
133fd9f5 DV |
219 | unsigned q; |
220 | ||
7c43d9a3 RV |
221 | /* 0 <= r < 10^8 */ |
222 | q = (r * (u64)0x28f5c29) >> 32; | |
223 | *((u16 *)buf) = decpair[r - 100*q]; | |
224 | buf += 2; | |
4277eedd | 225 | |
7c43d9a3 RV |
226 | /* 0 <= q < 10^6 */ |
227 | r = (q * (u64)0x28f5c29) >> 32; | |
228 | *((u16 *)buf) = decpair[q - 100*r]; | |
229 | buf += 2; | |
7b9186f5 | 230 | |
7c43d9a3 RV |
231 | /* 0 <= r < 10^4 */ |
232 | q = (r * 0x147b) >> 19; | |
233 | *((u16 *)buf) = decpair[r - 100*q]; | |
234 | buf += 2; | |
133fd9f5 | 235 | |
7c43d9a3 RV |
236 | /* 0 <= q < 100 */ |
237 | *((u16 *)buf) = decpair[q]; | |
238 | buf += 2; | |
239 | return buf; | |
240 | } | |
133fd9f5 | 241 | |
7c43d9a3 | 242 | static noinline_for_stack |
133fd9f5 DV |
243 | char *put_dec(char *buf, unsigned long long n) |
244 | { | |
7c43d9a3 RV |
245 | if (n >= 100*1000*1000) |
246 | buf = put_dec_full8(buf, do_div(n, 100*1000*1000)); | |
247 | /* 1 <= n <= 1.6e11 */ | |
248 | if (n >= 100*1000*1000) | |
249 | buf = put_dec_full8(buf, do_div(n, 100*1000*1000)); | |
250 | /* 1 <= n < 1e8 */ | |
133fd9f5 | 251 | return put_dec_trunc8(buf, n); |
4277eedd | 252 | } |
133fd9f5 | 253 | |
7c43d9a3 | 254 | #elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64 |
133fd9f5 | 255 | |
7c43d9a3 RV |
256 | static void |
257 | put_dec_full4(char *buf, unsigned r) | |
4277eedd | 258 | { |
7c43d9a3 RV |
259 | unsigned q; |
260 | ||
261 | /* 0 <= r < 10^4 */ | |
262 | q = (r * 0x147b) >> 19; | |
263 | *((u16 *)buf) = decpair[r - 100*q]; | |
264 | buf += 2; | |
265 | /* 0 <= q < 100 */ | |
266 | *((u16 *)buf) = decpair[q]; | |
2359172a GS |
267 | } |
268 | ||
269 | /* | |
270 | * Call put_dec_full4 on x % 10000, return x / 10000. | |
271 | * The approximation x/10000 == (x * 0x346DC5D7) >> 43 | |
272 | * holds for all x < 1,128,869,999. The largest value this | |
273 | * helper will ever be asked to convert is 1,125,520,955. | |
7c43d9a3 | 274 | * (second call in the put_dec code, assuming n is all-ones). |
2359172a | 275 | */ |
7c43d9a3 | 276 | static noinline_for_stack |
2359172a GS |
277 | unsigned put_dec_helper4(char *buf, unsigned x) |
278 | { | |
279 | uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43; | |
280 | ||
281 | put_dec_full4(buf, x - q * 10000); | |
282 | return q; | |
4277eedd DV |
283 | } |
284 | ||
133fd9f5 DV |
285 | /* Based on code by Douglas W. Jones found at |
286 | * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour> | |
287 | * (with permission from the author). | |
288 | * Performs no 64-bit division and hence should be fast on 32-bit machines. | |
289 | */ | |
290 | static | |
291 | char *put_dec(char *buf, unsigned long long n) | |
292 | { | |
293 | uint32_t d3, d2, d1, q, h; | |
294 | ||
295 | if (n < 100*1000*1000) | |
296 | return put_dec_trunc8(buf, n); | |
297 | ||
298 | d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */ | |
299 | h = (n >> 32); | |
300 | d2 = (h ) & 0xffff; | |
301 | d3 = (h >> 16); /* implicit "& 0xffff" */ | |
302 | ||
7c43d9a3 RV |
303 | /* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0 |
304 | = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */ | |
133fd9f5 | 305 | q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff); |
2359172a GS |
306 | q = put_dec_helper4(buf, q); |
307 | ||
308 | q += 7671 * d3 + 9496 * d2 + 6 * d1; | |
309 | q = put_dec_helper4(buf+4, q); | |
310 | ||
311 | q += 4749 * d3 + 42 * d2; | |
312 | q = put_dec_helper4(buf+8, q); | |
133fd9f5 | 313 | |
2359172a GS |
314 | q += 281 * d3; |
315 | buf += 12; | |
316 | if (q) | |
317 | buf = put_dec_trunc8(buf, q); | |
318 | else while (buf[-1] == '0') | |
133fd9f5 DV |
319 | --buf; |
320 | ||
321 | return buf; | |
322 | } | |
323 | ||
324 | #endif | |
325 | ||
1ac101a5 KH |
326 | /* |
327 | * Convert passed number to decimal string. | |
328 | * Returns the length of string. On buffer overflow, returns 0. | |
329 | * | |
330 | * If speed is not important, use snprintf(). It's easy to read the code. | |
331 | */ | |
332 | int num_to_str(char *buf, int size, unsigned long long num) | |
333 | { | |
7c43d9a3 RV |
334 | /* put_dec requires 2-byte alignment of the buffer. */ |
335 | char tmp[sizeof(num) * 3] __aligned(2); | |
1ac101a5 KH |
336 | int idx, len; |
337 | ||
133fd9f5 DV |
338 | /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */ |
339 | if (num <= 9) { | |
340 | tmp[0] = '0' + num; | |
341 | len = 1; | |
342 | } else { | |
343 | len = put_dec(tmp, num) - tmp; | |
344 | } | |
1ac101a5 KH |
345 | |
346 | if (len > size) | |
347 | return 0; | |
348 | for (idx = 0; idx < len; ++idx) | |
349 | buf[idx] = tmp[len - idx - 1]; | |
133fd9f5 | 350 | return len; |
1ac101a5 KH |
351 | } |
352 | ||
51be17df | 353 | #define SIGN 1 /* unsigned/signed, must be 1 */ |
d1c1b121 | 354 | #define LEFT 2 /* left justified */ |
1da177e4 LT |
355 | #define PLUS 4 /* show plus */ |
356 | #define SPACE 8 /* space if plus */ | |
d1c1b121 | 357 | #define ZEROPAD 16 /* pad with zero, must be 16 == '0' - ' ' */ |
b89dc5d6 BH |
358 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ |
359 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ | |
1da177e4 | 360 | |
fef20d9c FW |
361 | enum format_type { |
362 | FORMAT_TYPE_NONE, /* Just a string part */ | |
ed681a91 | 363 | FORMAT_TYPE_WIDTH, |
fef20d9c FW |
364 | FORMAT_TYPE_PRECISION, |
365 | FORMAT_TYPE_CHAR, | |
366 | FORMAT_TYPE_STR, | |
367 | FORMAT_TYPE_PTR, | |
368 | FORMAT_TYPE_PERCENT_CHAR, | |
369 | FORMAT_TYPE_INVALID, | |
370 | FORMAT_TYPE_LONG_LONG, | |
371 | FORMAT_TYPE_ULONG, | |
372 | FORMAT_TYPE_LONG, | |
a4e94ef0 Z |
373 | FORMAT_TYPE_UBYTE, |
374 | FORMAT_TYPE_BYTE, | |
fef20d9c FW |
375 | FORMAT_TYPE_USHORT, |
376 | FORMAT_TYPE_SHORT, | |
377 | FORMAT_TYPE_UINT, | |
378 | FORMAT_TYPE_INT, | |
fef20d9c FW |
379 | FORMAT_TYPE_SIZE_T, |
380 | FORMAT_TYPE_PTRDIFF | |
381 | }; | |
382 | ||
383 | struct printf_spec { | |
4e310fda | 384 | u8 type; /* format_type enum */ |
ef0658f3 | 385 | u8 flags; /* flags to number() */ |
4e310fda JP |
386 | u8 base; /* number base, 8, 10 or 16 only */ |
387 | u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */ | |
388 | s16 field_width; /* width of output field */ | |
389 | s16 precision; /* # of digits/chars */ | |
fef20d9c FW |
390 | }; |
391 | ||
cf3b429b JP |
392 | static noinline_for_stack |
393 | char *number(char *buf, char *end, unsigned long long num, | |
394 | struct printf_spec spec) | |
1da177e4 | 395 | { |
7c43d9a3 RV |
396 | /* put_dec requires 2-byte alignment of the buffer. */ |
397 | char tmp[3 * sizeof(num)] __aligned(2); | |
9b706aee DV |
398 | char sign; |
399 | char locase; | |
fef20d9c | 400 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
1da177e4 | 401 | int i; |
7c203422 | 402 | bool is_zero = num == 0LL; |
1da177e4 | 403 | |
9b706aee DV |
404 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
405 | * produces same digits or (maybe lowercased) letters */ | |
fef20d9c FW |
406 | locase = (spec.flags & SMALL); |
407 | if (spec.flags & LEFT) | |
408 | spec.flags &= ~ZEROPAD; | |
1da177e4 | 409 | sign = 0; |
fef20d9c | 410 | if (spec.flags & SIGN) { |
7b9186f5 | 411 | if ((signed long long)num < 0) { |
1da177e4 | 412 | sign = '-'; |
7b9186f5 | 413 | num = -(signed long long)num; |
fef20d9c FW |
414 | spec.field_width--; |
415 | } else if (spec.flags & PLUS) { | |
1da177e4 | 416 | sign = '+'; |
fef20d9c FW |
417 | spec.field_width--; |
418 | } else if (spec.flags & SPACE) { | |
1da177e4 | 419 | sign = ' '; |
fef20d9c | 420 | spec.field_width--; |
1da177e4 LT |
421 | } |
422 | } | |
b39a7340 | 423 | if (need_pfx) { |
fef20d9c | 424 | if (spec.base == 16) |
7c203422 PC |
425 | spec.field_width -= 2; |
426 | else if (!is_zero) | |
fef20d9c | 427 | spec.field_width--; |
1da177e4 | 428 | } |
b39a7340 DV |
429 | |
430 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 | 431 | i = 0; |
133fd9f5 | 432 | if (num < spec.base) |
3ea8d440 | 433 | tmp[i++] = hex_asc_upper[num] | locase; |
fef20d9c FW |
434 | else if (spec.base != 10) { /* 8 or 16 */ |
435 | int mask = spec.base - 1; | |
b39a7340 | 436 | int shift = 3; |
7b9186f5 AGR |
437 | |
438 | if (spec.base == 16) | |
439 | shift = 4; | |
b39a7340 | 440 | do { |
3ea8d440 | 441 | tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase); |
b39a7340 DV |
442 | num >>= shift; |
443 | } while (num); | |
4277eedd DV |
444 | } else { /* base 10 */ |
445 | i = put_dec(tmp, num) - tmp; | |
446 | } | |
b39a7340 DV |
447 | |
448 | /* printing 100 using %2d gives "100", not "00" */ | |
fef20d9c FW |
449 | if (i > spec.precision) |
450 | spec.precision = i; | |
b39a7340 | 451 | /* leading space padding */ |
fef20d9c | 452 | spec.field_width -= spec.precision; |
51be17df | 453 | if (!(spec.flags & (ZEROPAD | LEFT))) { |
7b9186f5 | 454 | while (--spec.field_width >= 0) { |
f796937a | 455 | if (buf < end) |
1da177e4 LT |
456 | *buf = ' '; |
457 | ++buf; | |
458 | } | |
459 | } | |
b39a7340 | 460 | /* sign */ |
1da177e4 | 461 | if (sign) { |
f796937a | 462 | if (buf < end) |
1da177e4 LT |
463 | *buf = sign; |
464 | ++buf; | |
465 | } | |
b39a7340 DV |
466 | /* "0x" / "0" prefix */ |
467 | if (need_pfx) { | |
7c203422 PC |
468 | if (spec.base == 16 || !is_zero) { |
469 | if (buf < end) | |
470 | *buf = '0'; | |
471 | ++buf; | |
472 | } | |
fef20d9c | 473 | if (spec.base == 16) { |
f796937a | 474 | if (buf < end) |
9b706aee | 475 | *buf = ('X' | locase); |
1da177e4 LT |
476 | ++buf; |
477 | } | |
478 | } | |
b39a7340 | 479 | /* zero or space padding */ |
fef20d9c | 480 | if (!(spec.flags & LEFT)) { |
d1c1b121 RV |
481 | char c = ' ' + (spec.flags & ZEROPAD); |
482 | BUILD_BUG_ON(' ' + ZEROPAD != '0'); | |
fef20d9c | 483 | while (--spec.field_width >= 0) { |
f796937a | 484 | if (buf < end) |
1da177e4 LT |
485 | *buf = c; |
486 | ++buf; | |
487 | } | |
488 | } | |
b39a7340 | 489 | /* hmm even more zero padding? */ |
fef20d9c | 490 | while (i <= --spec.precision) { |
f796937a | 491 | if (buf < end) |
1da177e4 LT |
492 | *buf = '0'; |
493 | ++buf; | |
494 | } | |
b39a7340 DV |
495 | /* actual digits of result */ |
496 | while (--i >= 0) { | |
f796937a | 497 | if (buf < end) |
1da177e4 LT |
498 | *buf = tmp[i]; |
499 | ++buf; | |
500 | } | |
b39a7340 | 501 | /* trailing space padding */ |
fef20d9c | 502 | while (--spec.field_width >= 0) { |
f796937a | 503 | if (buf < end) |
1da177e4 LT |
504 | *buf = ' '; |
505 | ++buf; | |
506 | } | |
7b9186f5 | 507 | |
1da177e4 LT |
508 | return buf; |
509 | } | |
510 | ||
cf3b429b JP |
511 | static noinline_for_stack |
512 | char *string(char *buf, char *end, const char *s, struct printf_spec spec) | |
0f9bfa56 LT |
513 | { |
514 | int len, i; | |
515 | ||
516 | if ((unsigned long)s < PAGE_SIZE) | |
0f4f81dc | 517 | s = "(null)"; |
0f9bfa56 | 518 | |
fef20d9c | 519 | len = strnlen(s, spec.precision); |
0f9bfa56 | 520 | |
fef20d9c FW |
521 | if (!(spec.flags & LEFT)) { |
522 | while (len < spec.field_width--) { | |
0f9bfa56 LT |
523 | if (buf < end) |
524 | *buf = ' '; | |
525 | ++buf; | |
526 | } | |
527 | } | |
528 | for (i = 0; i < len; ++i) { | |
529 | if (buf < end) | |
530 | *buf = *s; | |
531 | ++buf; ++s; | |
532 | } | |
fef20d9c | 533 | while (len < spec.field_width--) { |
0f9bfa56 LT |
534 | if (buf < end) |
535 | *buf = ' '; | |
536 | ++buf; | |
537 | } | |
7b9186f5 | 538 | |
0f9bfa56 LT |
539 | return buf; |
540 | } | |
541 | ||
4b6ccca7 AV |
542 | static void widen(char *buf, char *end, unsigned len, unsigned spaces) |
543 | { | |
544 | size_t size; | |
545 | if (buf >= end) /* nowhere to put anything */ | |
546 | return; | |
547 | size = end - buf; | |
548 | if (size <= spaces) { | |
549 | memset(buf, ' ', size); | |
550 | return; | |
551 | } | |
552 | if (len) { | |
553 | if (len > size - spaces) | |
554 | len = size - spaces; | |
555 | memmove(buf + spaces, buf, len); | |
556 | } | |
557 | memset(buf, ' ', spaces); | |
558 | } | |
559 | ||
560 | static noinline_for_stack | |
561 | char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec, | |
562 | const char *fmt) | |
563 | { | |
564 | const char *array[4], *s; | |
565 | const struct dentry *p; | |
566 | int depth; | |
567 | int i, n; | |
568 | ||
569 | switch (fmt[1]) { | |
570 | case '2': case '3': case '4': | |
571 | depth = fmt[1] - '0'; | |
572 | break; | |
573 | default: | |
574 | depth = 1; | |
575 | } | |
576 | ||
577 | rcu_read_lock(); | |
578 | for (i = 0; i < depth; i++, d = p) { | |
579 | p = ACCESS_ONCE(d->d_parent); | |
580 | array[i] = ACCESS_ONCE(d->d_name.name); | |
581 | if (p == d) { | |
582 | if (i) | |
583 | array[i] = ""; | |
584 | i++; | |
585 | break; | |
586 | } | |
587 | } | |
588 | s = array[--i]; | |
589 | for (n = 0; n != spec.precision; n++, buf++) { | |
590 | char c = *s++; | |
591 | if (!c) { | |
592 | if (!i) | |
593 | break; | |
594 | c = '/'; | |
595 | s = array[--i]; | |
596 | } | |
597 | if (buf < end) | |
598 | *buf = c; | |
599 | } | |
600 | rcu_read_unlock(); | |
601 | if (n < spec.field_width) { | |
602 | /* we want to pad the sucker */ | |
603 | unsigned spaces = spec.field_width - n; | |
604 | if (!(spec.flags & LEFT)) { | |
605 | widen(buf - n, end, n, spaces); | |
606 | return buf + spaces; | |
607 | } | |
608 | while (spaces--) { | |
609 | if (buf < end) | |
610 | *buf = ' '; | |
611 | ++buf; | |
612 | } | |
613 | } | |
614 | return buf; | |
615 | } | |
616 | ||
cf3b429b JP |
617 | static noinline_for_stack |
618 | char *symbol_string(char *buf, char *end, void *ptr, | |
b0d33c2b | 619 | struct printf_spec spec, const char *fmt) |
0fe1ef24 | 620 | { |
b0d33c2b | 621 | unsigned long value; |
0fe1ef24 LT |
622 | #ifdef CONFIG_KALLSYMS |
623 | char sym[KSYM_SYMBOL_LEN]; | |
b0d33c2b JP |
624 | #endif |
625 | ||
626 | if (fmt[1] == 'R') | |
627 | ptr = __builtin_extract_return_addr(ptr); | |
628 | value = (unsigned long)ptr; | |
629 | ||
630 | #ifdef CONFIG_KALLSYMS | |
631 | if (*fmt == 'B') | |
0f77a8d3 | 632 | sprint_backtrace(sym, value); |
b0d33c2b | 633 | else if (*fmt != 'f' && *fmt != 's') |
0c8b946e FW |
634 | sprint_symbol(sym, value); |
635 | else | |
4796dd20 | 636 | sprint_symbol_no_offset(sym, value); |
7b9186f5 | 637 | |
fef20d9c | 638 | return string(buf, end, sym, spec); |
0fe1ef24 | 639 | #else |
7b9186f5 | 640 | spec.field_width = 2 * sizeof(void *); |
fef20d9c FW |
641 | spec.flags |= SPECIAL | SMALL | ZEROPAD; |
642 | spec.base = 16; | |
7b9186f5 | 643 | |
fef20d9c | 644 | return number(buf, end, value, spec); |
0fe1ef24 LT |
645 | #endif |
646 | } | |
647 | ||
cf3b429b JP |
648 | static noinline_for_stack |
649 | char *resource_string(char *buf, char *end, struct resource *res, | |
650 | struct printf_spec spec, const char *fmt) | |
332d2e78 LT |
651 | { |
652 | #ifndef IO_RSRC_PRINTK_SIZE | |
28405372 | 653 | #define IO_RSRC_PRINTK_SIZE 6 |
332d2e78 LT |
654 | #endif |
655 | ||
656 | #ifndef MEM_RSRC_PRINTK_SIZE | |
28405372 | 657 | #define MEM_RSRC_PRINTK_SIZE 10 |
332d2e78 | 658 | #endif |
4da0b66c | 659 | static const struct printf_spec io_spec = { |
fef20d9c | 660 | .base = 16, |
4da0b66c | 661 | .field_width = IO_RSRC_PRINTK_SIZE, |
fef20d9c FW |
662 | .precision = -1, |
663 | .flags = SPECIAL | SMALL | ZEROPAD, | |
664 | }; | |
4da0b66c BH |
665 | static const struct printf_spec mem_spec = { |
666 | .base = 16, | |
667 | .field_width = MEM_RSRC_PRINTK_SIZE, | |
668 | .precision = -1, | |
669 | .flags = SPECIAL | SMALL | ZEROPAD, | |
670 | }; | |
0f4050c7 BH |
671 | static const struct printf_spec bus_spec = { |
672 | .base = 16, | |
673 | .field_width = 2, | |
674 | .precision = -1, | |
675 | .flags = SMALL | ZEROPAD, | |
676 | }; | |
4da0b66c | 677 | static const struct printf_spec dec_spec = { |
c91d3376 BH |
678 | .base = 10, |
679 | .precision = -1, | |
680 | .flags = 0, | |
681 | }; | |
4da0b66c | 682 | static const struct printf_spec str_spec = { |
fd95541e BH |
683 | .field_width = -1, |
684 | .precision = 10, | |
685 | .flags = LEFT, | |
686 | }; | |
4da0b66c | 687 | static const struct printf_spec flag_spec = { |
fd95541e BH |
688 | .base = 16, |
689 | .precision = -1, | |
690 | .flags = SPECIAL | SMALL, | |
691 | }; | |
c7dabef8 BH |
692 | |
693 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) | |
694 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ | |
695 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) | |
696 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) | |
9d7cca04 | 697 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") |
c7dabef8 BH |
698 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") |
699 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, | |
700 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; | |
701 | ||
332d2e78 | 702 | char *p = sym, *pend = sym + sizeof(sym); |
c7dabef8 | 703 | int decode = (fmt[0] == 'R') ? 1 : 0; |
4da0b66c | 704 | const struct printf_spec *specp; |
332d2e78 LT |
705 | |
706 | *p++ = '['; | |
4da0b66c | 707 | if (res->flags & IORESOURCE_IO) { |
c7dabef8 | 708 | p = string(p, pend, "io ", str_spec); |
4da0b66c BH |
709 | specp = &io_spec; |
710 | } else if (res->flags & IORESOURCE_MEM) { | |
c7dabef8 | 711 | p = string(p, pend, "mem ", str_spec); |
4da0b66c BH |
712 | specp = &mem_spec; |
713 | } else if (res->flags & IORESOURCE_IRQ) { | |
c7dabef8 | 714 | p = string(p, pend, "irq ", str_spec); |
4da0b66c BH |
715 | specp = &dec_spec; |
716 | } else if (res->flags & IORESOURCE_DMA) { | |
c7dabef8 | 717 | p = string(p, pend, "dma ", str_spec); |
4da0b66c | 718 | specp = &dec_spec; |
0f4050c7 BH |
719 | } else if (res->flags & IORESOURCE_BUS) { |
720 | p = string(p, pend, "bus ", str_spec); | |
721 | specp = &bus_spec; | |
4da0b66c | 722 | } else { |
c7dabef8 | 723 | p = string(p, pend, "??? ", str_spec); |
4da0b66c | 724 | specp = &mem_spec; |
c7dabef8 | 725 | decode = 0; |
fd95541e | 726 | } |
d19cb803 BH |
727 | if (decode && res->flags & IORESOURCE_UNSET) { |
728 | p = string(p, pend, "size ", str_spec); | |
729 | p = number(p, pend, resource_size(res), *specp); | |
730 | } else { | |
731 | p = number(p, pend, res->start, *specp); | |
732 | if (res->start != res->end) { | |
733 | *p++ = '-'; | |
734 | p = number(p, pend, res->end, *specp); | |
735 | } | |
c91d3376 | 736 | } |
c7dabef8 | 737 | if (decode) { |
fd95541e BH |
738 | if (res->flags & IORESOURCE_MEM_64) |
739 | p = string(p, pend, " 64bit", str_spec); | |
740 | if (res->flags & IORESOURCE_PREFETCH) | |
741 | p = string(p, pend, " pref", str_spec); | |
9d7cca04 BH |
742 | if (res->flags & IORESOURCE_WINDOW) |
743 | p = string(p, pend, " window", str_spec); | |
fd95541e BH |
744 | if (res->flags & IORESOURCE_DISABLED) |
745 | p = string(p, pend, " disabled", str_spec); | |
c7dabef8 BH |
746 | } else { |
747 | p = string(p, pend, " flags ", str_spec); | |
748 | p = number(p, pend, res->flags, flag_spec); | |
fd95541e | 749 | } |
332d2e78 | 750 | *p++ = ']'; |
c7dabef8 | 751 | *p = '\0'; |
332d2e78 | 752 | |
fef20d9c | 753 | return string(buf, end, sym, spec); |
332d2e78 LT |
754 | } |
755 | ||
31550a16 AS |
756 | static noinline_for_stack |
757 | char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
758 | const char *fmt) | |
759 | { | |
360603a1 | 760 | int i, len = 1; /* if we pass '%ph[CDN]', field width remains |
31550a16 AS |
761 | negative value, fallback to the default */ |
762 | char separator; | |
763 | ||
764 | if (spec.field_width == 0) | |
765 | /* nothing to print */ | |
766 | return buf; | |
767 | ||
768 | if (ZERO_OR_NULL_PTR(addr)) | |
769 | /* NULL pointer */ | |
770 | return string(buf, end, NULL, spec); | |
771 | ||
772 | switch (fmt[1]) { | |
773 | case 'C': | |
774 | separator = ':'; | |
775 | break; | |
776 | case 'D': | |
777 | separator = '-'; | |
778 | break; | |
779 | case 'N': | |
780 | separator = 0; | |
781 | break; | |
782 | default: | |
783 | separator = ' '; | |
784 | break; | |
785 | } | |
786 | ||
787 | if (spec.field_width > 0) | |
788 | len = min_t(int, spec.field_width, 64); | |
789 | ||
9c98f235 RV |
790 | for (i = 0; i < len; ++i) { |
791 | if (buf < end) | |
792 | *buf = hex_asc_hi(addr[i]); | |
793 | ++buf; | |
794 | if (buf < end) | |
795 | *buf = hex_asc_lo(addr[i]); | |
796 | ++buf; | |
31550a16 | 797 | |
9c98f235 RV |
798 | if (separator && i != len - 1) { |
799 | if (buf < end) | |
800 | *buf = separator; | |
801 | ++buf; | |
802 | } | |
31550a16 AS |
803 | } |
804 | ||
805 | return buf; | |
806 | } | |
807 | ||
dbc760bc TH |
808 | static noinline_for_stack |
809 | char *bitmap_string(char *buf, char *end, unsigned long *bitmap, | |
810 | struct printf_spec spec, const char *fmt) | |
811 | { | |
812 | const int CHUNKSZ = 32; | |
813 | int nr_bits = max_t(int, spec.field_width, 0); | |
814 | int i, chunksz; | |
815 | bool first = true; | |
816 | ||
817 | /* reused to print numbers */ | |
818 | spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 }; | |
819 | ||
820 | chunksz = nr_bits & (CHUNKSZ - 1); | |
821 | if (chunksz == 0) | |
822 | chunksz = CHUNKSZ; | |
823 | ||
824 | i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ; | |
825 | for (; i >= 0; i -= CHUNKSZ) { | |
826 | u32 chunkmask, val; | |
827 | int word, bit; | |
828 | ||
829 | chunkmask = ((1ULL << chunksz) - 1); | |
830 | word = i / BITS_PER_LONG; | |
831 | bit = i % BITS_PER_LONG; | |
832 | val = (bitmap[word] >> bit) & chunkmask; | |
833 | ||
834 | if (!first) { | |
835 | if (buf < end) | |
836 | *buf = ','; | |
837 | buf++; | |
838 | } | |
839 | first = false; | |
840 | ||
841 | spec.field_width = DIV_ROUND_UP(chunksz, 4); | |
842 | buf = number(buf, end, val, spec); | |
843 | ||
844 | chunksz = CHUNKSZ; | |
845 | } | |
846 | return buf; | |
847 | } | |
848 | ||
849 | static noinline_for_stack | |
850 | char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap, | |
851 | struct printf_spec spec, const char *fmt) | |
852 | { | |
853 | int nr_bits = max_t(int, spec.field_width, 0); | |
854 | /* current bit is 'cur', most recently seen range is [rbot, rtop] */ | |
855 | int cur, rbot, rtop; | |
856 | bool first = true; | |
857 | ||
858 | /* reused to print numbers */ | |
859 | spec = (struct printf_spec){ .base = 10 }; | |
860 | ||
861 | rbot = cur = find_first_bit(bitmap, nr_bits); | |
862 | while (cur < nr_bits) { | |
863 | rtop = cur; | |
864 | cur = find_next_bit(bitmap, nr_bits, cur + 1); | |
865 | if (cur < nr_bits && cur <= rtop + 1) | |
866 | continue; | |
867 | ||
868 | if (!first) { | |
869 | if (buf < end) | |
870 | *buf = ','; | |
871 | buf++; | |
872 | } | |
873 | first = false; | |
874 | ||
875 | buf = number(buf, end, rbot, spec); | |
876 | if (rbot < rtop) { | |
877 | if (buf < end) | |
878 | *buf = '-'; | |
879 | buf++; | |
880 | ||
881 | buf = number(buf, end, rtop, spec); | |
882 | } | |
883 | ||
884 | rbot = cur; | |
885 | } | |
886 | return buf; | |
887 | } | |
888 | ||
cf3b429b JP |
889 | static noinline_for_stack |
890 | char *mac_address_string(char *buf, char *end, u8 *addr, | |
891 | struct printf_spec spec, const char *fmt) | |
dd45c9cf | 892 | { |
8a27f7c9 | 893 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
dd45c9cf HH |
894 | char *p = mac_addr; |
895 | int i; | |
bc7259a2 | 896 | char separator; |
76597ff9 | 897 | bool reversed = false; |
bc7259a2 | 898 | |
76597ff9 AE |
899 | switch (fmt[1]) { |
900 | case 'F': | |
bc7259a2 | 901 | separator = '-'; |
76597ff9 AE |
902 | break; |
903 | ||
904 | case 'R': | |
905 | reversed = true; | |
906 | /* fall through */ | |
907 | ||
908 | default: | |
bc7259a2 | 909 | separator = ':'; |
76597ff9 | 910 | break; |
bc7259a2 | 911 | } |
dd45c9cf HH |
912 | |
913 | for (i = 0; i < 6; i++) { | |
76597ff9 AE |
914 | if (reversed) |
915 | p = hex_byte_pack(p, addr[5 - i]); | |
916 | else | |
917 | p = hex_byte_pack(p, addr[i]); | |
918 | ||
8a27f7c9 | 919 | if (fmt[0] == 'M' && i != 5) |
bc7259a2 | 920 | *p++ = separator; |
dd45c9cf HH |
921 | } |
922 | *p = '\0'; | |
923 | ||
fef20d9c | 924 | return string(buf, end, mac_addr, spec); |
dd45c9cf HH |
925 | } |
926 | ||
cf3b429b JP |
927 | static noinline_for_stack |
928 | char *ip4_string(char *p, const u8 *addr, const char *fmt) | |
8a27f7c9 JP |
929 | { |
930 | int i; | |
0159f24e JP |
931 | bool leading_zeros = (fmt[0] == 'i'); |
932 | int index; | |
933 | int step; | |
934 | ||
935 | switch (fmt[2]) { | |
936 | case 'h': | |
937 | #ifdef __BIG_ENDIAN | |
938 | index = 0; | |
939 | step = 1; | |
940 | #else | |
941 | index = 3; | |
942 | step = -1; | |
943 | #endif | |
944 | break; | |
945 | case 'l': | |
946 | index = 3; | |
947 | step = -1; | |
948 | break; | |
949 | case 'n': | |
950 | case 'b': | |
951 | default: | |
952 | index = 0; | |
953 | step = 1; | |
954 | break; | |
955 | } | |
8a27f7c9 | 956 | for (i = 0; i < 4; i++) { |
7c43d9a3 | 957 | char temp[4] __aligned(2); /* hold each IP quad in reverse order */ |
133fd9f5 | 958 | int digits = put_dec_trunc8(temp, addr[index]) - temp; |
8a27f7c9 JP |
959 | if (leading_zeros) { |
960 | if (digits < 3) | |
961 | *p++ = '0'; | |
962 | if (digits < 2) | |
963 | *p++ = '0'; | |
964 | } | |
965 | /* reverse the digits in the quad */ | |
966 | while (digits--) | |
967 | *p++ = temp[digits]; | |
968 | if (i < 3) | |
969 | *p++ = '.'; | |
0159f24e | 970 | index += step; |
8a27f7c9 | 971 | } |
8a27f7c9 | 972 | *p = '\0'; |
7b9186f5 | 973 | |
8a27f7c9 JP |
974 | return p; |
975 | } | |
976 | ||
cf3b429b JP |
977 | static noinline_for_stack |
978 | char *ip6_compressed_string(char *p, const char *addr) | |
689afa7d | 979 | { |
7b9186f5 | 980 | int i, j, range; |
8a27f7c9 JP |
981 | unsigned char zerolength[8]; |
982 | int longest = 1; | |
983 | int colonpos = -1; | |
984 | u16 word; | |
7b9186f5 | 985 | u8 hi, lo; |
8a27f7c9 | 986 | bool needcolon = false; |
eb78cd26 JP |
987 | bool useIPv4; |
988 | struct in6_addr in6; | |
989 | ||
990 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
991 | ||
992 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
8a27f7c9 JP |
993 | |
994 | memset(zerolength, 0, sizeof(zerolength)); | |
995 | ||
996 | if (useIPv4) | |
997 | range = 6; | |
998 | else | |
999 | range = 8; | |
1000 | ||
1001 | /* find position of longest 0 run */ | |
1002 | for (i = 0; i < range; i++) { | |
1003 | for (j = i; j < range; j++) { | |
eb78cd26 | 1004 | if (in6.s6_addr16[j] != 0) |
8a27f7c9 JP |
1005 | break; |
1006 | zerolength[i]++; | |
1007 | } | |
1008 | } | |
1009 | for (i = 0; i < range; i++) { | |
1010 | if (zerolength[i] > longest) { | |
1011 | longest = zerolength[i]; | |
1012 | colonpos = i; | |
1013 | } | |
1014 | } | |
29cf519e JP |
1015 | if (longest == 1) /* don't compress a single 0 */ |
1016 | colonpos = -1; | |
689afa7d | 1017 | |
8a27f7c9 JP |
1018 | /* emit address */ |
1019 | for (i = 0; i < range; i++) { | |
1020 | if (i == colonpos) { | |
1021 | if (needcolon || i == 0) | |
1022 | *p++ = ':'; | |
1023 | *p++ = ':'; | |
1024 | needcolon = false; | |
1025 | i += longest - 1; | |
1026 | continue; | |
1027 | } | |
1028 | if (needcolon) { | |
1029 | *p++ = ':'; | |
1030 | needcolon = false; | |
1031 | } | |
1032 | /* hex u16 without leading 0s */ | |
eb78cd26 | 1033 | word = ntohs(in6.s6_addr16[i]); |
8a27f7c9 JP |
1034 | hi = word >> 8; |
1035 | lo = word & 0xff; | |
1036 | if (hi) { | |
1037 | if (hi > 0x0f) | |
55036ba7 | 1038 | p = hex_byte_pack(p, hi); |
8a27f7c9 JP |
1039 | else |
1040 | *p++ = hex_asc_lo(hi); | |
55036ba7 | 1041 | p = hex_byte_pack(p, lo); |
8a27f7c9 | 1042 | } |
b5ff992b | 1043 | else if (lo > 0x0f) |
55036ba7 | 1044 | p = hex_byte_pack(p, lo); |
8a27f7c9 JP |
1045 | else |
1046 | *p++ = hex_asc_lo(lo); | |
1047 | needcolon = true; | |
1048 | } | |
1049 | ||
1050 | if (useIPv4) { | |
1051 | if (needcolon) | |
1052 | *p++ = ':'; | |
0159f24e | 1053 | p = ip4_string(p, &in6.s6_addr[12], "I4"); |
8a27f7c9 | 1054 | } |
8a27f7c9 | 1055 | *p = '\0'; |
7b9186f5 | 1056 | |
8a27f7c9 JP |
1057 | return p; |
1058 | } | |
1059 | ||
cf3b429b JP |
1060 | static noinline_for_stack |
1061 | char *ip6_string(char *p, const char *addr, const char *fmt) | |
8a27f7c9 JP |
1062 | { |
1063 | int i; | |
7b9186f5 | 1064 | |
689afa7d | 1065 | for (i = 0; i < 8; i++) { |
55036ba7 AS |
1066 | p = hex_byte_pack(p, *addr++); |
1067 | p = hex_byte_pack(p, *addr++); | |
8a27f7c9 | 1068 | if (fmt[0] == 'I' && i != 7) |
689afa7d HH |
1069 | *p++ = ':'; |
1070 | } | |
1071 | *p = '\0'; | |
7b9186f5 | 1072 | |
8a27f7c9 JP |
1073 | return p; |
1074 | } | |
1075 | ||
cf3b429b JP |
1076 | static noinline_for_stack |
1077 | char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
1078 | struct printf_spec spec, const char *fmt) | |
8a27f7c9 JP |
1079 | { |
1080 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
1081 | ||
1082 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
eb78cd26 | 1083 | ip6_compressed_string(ip6_addr, addr); |
8a27f7c9 | 1084 | else |
eb78cd26 | 1085 | ip6_string(ip6_addr, addr, fmt); |
689afa7d | 1086 | |
fef20d9c | 1087 | return string(buf, end, ip6_addr, spec); |
689afa7d HH |
1088 | } |
1089 | ||
cf3b429b JP |
1090 | static noinline_for_stack |
1091 | char *ip4_addr_string(char *buf, char *end, const u8 *addr, | |
1092 | struct printf_spec spec, const char *fmt) | |
4aa99606 | 1093 | { |
8a27f7c9 | 1094 | char ip4_addr[sizeof("255.255.255.255")]; |
4aa99606 | 1095 | |
0159f24e | 1096 | ip4_string(ip4_addr, addr, fmt); |
4aa99606 | 1097 | |
fef20d9c | 1098 | return string(buf, end, ip4_addr, spec); |
4aa99606 HH |
1099 | } |
1100 | ||
10679643 DB |
1101 | static noinline_for_stack |
1102 | char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa, | |
1103 | struct printf_spec spec, const char *fmt) | |
1104 | { | |
1105 | bool have_p = false, have_s = false, have_f = false, have_c = false; | |
1106 | char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") + | |
1107 | sizeof(":12345") + sizeof("/123456789") + | |
1108 | sizeof("%1234567890")]; | |
1109 | char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr); | |
1110 | const u8 *addr = (const u8 *) &sa->sin6_addr; | |
1111 | char fmt6[2] = { fmt[0], '6' }; | |
1112 | u8 off = 0; | |
1113 | ||
1114 | fmt++; | |
1115 | while (isalpha(*++fmt)) { | |
1116 | switch (*fmt) { | |
1117 | case 'p': | |
1118 | have_p = true; | |
1119 | break; | |
1120 | case 'f': | |
1121 | have_f = true; | |
1122 | break; | |
1123 | case 's': | |
1124 | have_s = true; | |
1125 | break; | |
1126 | case 'c': | |
1127 | have_c = true; | |
1128 | break; | |
1129 | } | |
1130 | } | |
1131 | ||
1132 | if (have_p || have_s || have_f) { | |
1133 | *p = '['; | |
1134 | off = 1; | |
1135 | } | |
1136 | ||
1137 | if (fmt6[0] == 'I' && have_c) | |
1138 | p = ip6_compressed_string(ip6_addr + off, addr); | |
1139 | else | |
1140 | p = ip6_string(ip6_addr + off, addr, fmt6); | |
1141 | ||
1142 | if (have_p || have_s || have_f) | |
1143 | *p++ = ']'; | |
1144 | ||
1145 | if (have_p) { | |
1146 | *p++ = ':'; | |
1147 | p = number(p, pend, ntohs(sa->sin6_port), spec); | |
1148 | } | |
1149 | if (have_f) { | |
1150 | *p++ = '/'; | |
1151 | p = number(p, pend, ntohl(sa->sin6_flowinfo & | |
1152 | IPV6_FLOWINFO_MASK), spec); | |
1153 | } | |
1154 | if (have_s) { | |
1155 | *p++ = '%'; | |
1156 | p = number(p, pend, sa->sin6_scope_id, spec); | |
1157 | } | |
1158 | *p = '\0'; | |
1159 | ||
1160 | return string(buf, end, ip6_addr, spec); | |
1161 | } | |
1162 | ||
1163 | static noinline_for_stack | |
1164 | char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa, | |
1165 | struct printf_spec spec, const char *fmt) | |
1166 | { | |
1167 | bool have_p = false; | |
1168 | char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")]; | |
1169 | char *pend = ip4_addr + sizeof(ip4_addr); | |
1170 | const u8 *addr = (const u8 *) &sa->sin_addr.s_addr; | |
1171 | char fmt4[3] = { fmt[0], '4', 0 }; | |
1172 | ||
1173 | fmt++; | |
1174 | while (isalpha(*++fmt)) { | |
1175 | switch (*fmt) { | |
1176 | case 'p': | |
1177 | have_p = true; | |
1178 | break; | |
1179 | case 'h': | |
1180 | case 'l': | |
1181 | case 'n': | |
1182 | case 'b': | |
1183 | fmt4[2] = *fmt; | |
1184 | break; | |
1185 | } | |
1186 | } | |
1187 | ||
1188 | p = ip4_string(ip4_addr, addr, fmt4); | |
1189 | if (have_p) { | |
1190 | *p++ = ':'; | |
1191 | p = number(p, pend, ntohs(sa->sin_port), spec); | |
1192 | } | |
1193 | *p = '\0'; | |
1194 | ||
1195 | return string(buf, end, ip4_addr, spec); | |
1196 | } | |
1197 | ||
71dca95d AS |
1198 | static noinline_for_stack |
1199 | char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
1200 | const char *fmt) | |
1201 | { | |
1202 | bool found = true; | |
1203 | int count = 1; | |
1204 | unsigned int flags = 0; | |
1205 | int len; | |
1206 | ||
1207 | if (spec.field_width == 0) | |
1208 | return buf; /* nothing to print */ | |
1209 | ||
1210 | if (ZERO_OR_NULL_PTR(addr)) | |
1211 | return string(buf, end, NULL, spec); /* NULL pointer */ | |
1212 | ||
1213 | ||
1214 | do { | |
1215 | switch (fmt[count++]) { | |
1216 | case 'a': | |
1217 | flags |= ESCAPE_ANY; | |
1218 | break; | |
1219 | case 'c': | |
1220 | flags |= ESCAPE_SPECIAL; | |
1221 | break; | |
1222 | case 'h': | |
1223 | flags |= ESCAPE_HEX; | |
1224 | break; | |
1225 | case 'n': | |
1226 | flags |= ESCAPE_NULL; | |
1227 | break; | |
1228 | case 'o': | |
1229 | flags |= ESCAPE_OCTAL; | |
1230 | break; | |
1231 | case 'p': | |
1232 | flags |= ESCAPE_NP; | |
1233 | break; | |
1234 | case 's': | |
1235 | flags |= ESCAPE_SPACE; | |
1236 | break; | |
1237 | default: | |
1238 | found = false; | |
1239 | break; | |
1240 | } | |
1241 | } while (found); | |
1242 | ||
1243 | if (!flags) | |
1244 | flags = ESCAPE_ANY_NP; | |
1245 | ||
1246 | len = spec.field_width < 0 ? 1 : spec.field_width; | |
1247 | ||
41416f23 RV |
1248 | /* |
1249 | * string_escape_mem() writes as many characters as it can to | |
1250 | * the given buffer, and returns the total size of the output | |
1251 | * had the buffer been big enough. | |
1252 | */ | |
1253 | buf += string_escape_mem(addr, len, buf, buf < end ? end - buf : 0, flags, NULL); | |
71dca95d AS |
1254 | |
1255 | return buf; | |
1256 | } | |
1257 | ||
cf3b429b JP |
1258 | static noinline_for_stack |
1259 | char *uuid_string(char *buf, char *end, const u8 *addr, | |
1260 | struct printf_spec spec, const char *fmt) | |
9ac6e44e JP |
1261 | { |
1262 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; | |
1263 | char *p = uuid; | |
1264 | int i; | |
1265 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; | |
1266 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; | |
1267 | const u8 *index = be; | |
1268 | bool uc = false; | |
1269 | ||
1270 | switch (*(++fmt)) { | |
1271 | case 'L': | |
1272 | uc = true; /* fall-through */ | |
1273 | case 'l': | |
1274 | index = le; | |
1275 | break; | |
1276 | case 'B': | |
1277 | uc = true; | |
1278 | break; | |
1279 | } | |
1280 | ||
1281 | for (i = 0; i < 16; i++) { | |
55036ba7 | 1282 | p = hex_byte_pack(p, addr[index[i]]); |
9ac6e44e JP |
1283 | switch (i) { |
1284 | case 3: | |
1285 | case 5: | |
1286 | case 7: | |
1287 | case 9: | |
1288 | *p++ = '-'; | |
1289 | break; | |
1290 | } | |
1291 | } | |
1292 | ||
1293 | *p = 0; | |
1294 | ||
1295 | if (uc) { | |
1296 | p = uuid; | |
1297 | do { | |
1298 | *p = toupper(*p); | |
1299 | } while (*(++p)); | |
1300 | } | |
1301 | ||
1302 | return string(buf, end, uuid, spec); | |
1303 | } | |
1304 | ||
c8f44aff MM |
1305 | static |
1306 | char *netdev_feature_string(char *buf, char *end, const u8 *addr, | |
1307 | struct printf_spec spec) | |
1308 | { | |
1309 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
1310 | if (spec.field_width == -1) | |
1311 | spec.field_width = 2 + 2 * sizeof(netdev_features_t); | |
1312 | spec.base = 16; | |
1313 | ||
1314 | return number(buf, end, *(const netdev_features_t *)addr, spec); | |
1315 | } | |
1316 | ||
aaf07621 JP |
1317 | static noinline_for_stack |
1318 | char *address_val(char *buf, char *end, const void *addr, | |
1319 | struct printf_spec spec, const char *fmt) | |
1320 | { | |
1321 | unsigned long long num; | |
1322 | ||
1323 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
1324 | spec.base = 16; | |
1325 | ||
1326 | switch (fmt[1]) { | |
1327 | case 'd': | |
1328 | num = *(const dma_addr_t *)addr; | |
1329 | spec.field_width = sizeof(dma_addr_t) * 2 + 2; | |
1330 | break; | |
1331 | case 'p': | |
1332 | default: | |
1333 | num = *(const phys_addr_t *)addr; | |
1334 | spec.field_width = sizeof(phys_addr_t) * 2 + 2; | |
1335 | break; | |
1336 | } | |
1337 | ||
1338 | return number(buf, end, num, spec); | |
1339 | } | |
1340 | ||
900cca29 GU |
1341 | static noinline_for_stack |
1342 | char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec, | |
1343 | const char *fmt) | |
1344 | { | |
1345 | if (!IS_ENABLED(CONFIG_HAVE_CLK) || !clk) | |
1346 | return string(buf, end, NULL, spec); | |
1347 | ||
1348 | switch (fmt[1]) { | |
1349 | case 'r': | |
1350 | return number(buf, end, clk_get_rate(clk), spec); | |
1351 | ||
1352 | case 'n': | |
1353 | default: | |
1354 | #ifdef CONFIG_COMMON_CLK | |
1355 | return string(buf, end, __clk_get_name(clk), spec); | |
1356 | #else | |
1357 | spec.base = 16; | |
1358 | spec.field_width = sizeof(unsigned long) * 2 + 2; | |
1359 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
1360 | return number(buf, end, (unsigned long)clk, spec); | |
1361 | #endif | |
1362 | } | |
1363 | } | |
1364 | ||
411f05f1 | 1365 | int kptr_restrict __read_mostly; |
455cd5ab | 1366 | |
4d8a743c LT |
1367 | /* |
1368 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
1369 | * by an extra set of alphanumeric characters that are extended format | |
1370 | * specifiers. | |
1371 | * | |
332d2e78 LT |
1372 | * Right now we handle: |
1373 | * | |
0c8b946e FW |
1374 | * - 'F' For symbolic function descriptor pointers with offset |
1375 | * - 'f' For simple symbolic function names without offset | |
0efb4d20 SR |
1376 | * - 'S' For symbolic direct pointers with offset |
1377 | * - 's' For symbolic direct pointers without offset | |
b0d33c2b | 1378 | * - '[FfSs]R' as above with __builtin_extract_return_addr() translation |
0f77a8d3 | 1379 | * - 'B' For backtraced symbolic direct pointers with offset |
c7dabef8 BH |
1380 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] |
1381 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
dbc760bc TH |
1382 | * - 'b[l]' For a bitmap, the number of bits is determined by the field |
1383 | * width which must be explicitly specified either as part of the | |
1384 | * format string '%32b[l]' or through '%*b[l]', [l] selects | |
1385 | * range-list format instead of hex format | |
dd45c9cf HH |
1386 | * - 'M' For a 6-byte MAC address, it prints the address in the |
1387 | * usual colon-separated hex notation | |
8a27f7c9 | 1388 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
bc7259a2 | 1389 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address |
c8e00060 | 1390 | * with a dash-separated hex notation |
7c59154e | 1391 | * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth) |
8a27f7c9 JP |
1392 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way |
1393 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
1394 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
10679643 DB |
1395 | * [S][pfs] |
1396 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1397 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
8a27f7c9 JP |
1398 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses |
1399 | * IPv6 omits the colons (01020304...0f) | |
1400 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
10679643 DB |
1401 | * [S][pfs] |
1402 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1403 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
1404 | * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order | |
1405 | * - 'I[6S]c' for IPv6 addresses printed as specified by | |
29cf519e | 1406 | * http://tools.ietf.org/html/rfc5952 |
71dca95d AS |
1407 | * - 'E[achnops]' For an escaped buffer, where rules are defined by combination |
1408 | * of the following flags (see string_escape_mem() for the | |
1409 | * details): | |
1410 | * a - ESCAPE_ANY | |
1411 | * c - ESCAPE_SPECIAL | |
1412 | * h - ESCAPE_HEX | |
1413 | * n - ESCAPE_NULL | |
1414 | * o - ESCAPE_OCTAL | |
1415 | * p - ESCAPE_NP | |
1416 | * s - ESCAPE_SPACE | |
1417 | * By default ESCAPE_ANY_NP is used. | |
9ac6e44e JP |
1418 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form |
1419 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" | |
1420 | * Options for %pU are: | |
1421 | * b big endian lower case hex (default) | |
1422 | * B big endian UPPER case hex | |
1423 | * l little endian lower case hex | |
1424 | * L little endian UPPER case hex | |
1425 | * big endian output byte order is: | |
1426 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] | |
1427 | * little endian output byte order is: | |
1428 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] | |
7db6f5fb JP |
1429 | * - 'V' For a struct va_format which contains a format string * and va_list *, |
1430 | * call vsnprintf(->format, *->va_list). | |
1431 | * Implements a "recursive vsnprintf". | |
1432 | * Do not use this feature without some mechanism to verify the | |
1433 | * correctness of the format string and va_list arguments. | |
455cd5ab | 1434 | * - 'K' For a kernel pointer that should be hidden from unprivileged users |
c8f44aff | 1435 | * - 'NF' For a netdev_features_t |
31550a16 AS |
1436 | * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with |
1437 | * a certain separator (' ' by default): | |
1438 | * C colon | |
1439 | * D dash | |
1440 | * N no separator | |
1441 | * The maximum supported length is 64 bytes of the input. Consider | |
1442 | * to use print_hex_dump() for the larger input. | |
aaf07621 JP |
1443 | * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives |
1444 | * (default assumed to be phys_addr_t, passed by reference) | |
c0d92a57 OJ |
1445 | * - 'd[234]' For a dentry name (optionally 2-4 last components) |
1446 | * - 'D[234]' Same as 'd' but for a struct file | |
900cca29 GU |
1447 | * - 'C' For a clock, it prints the name (Common Clock Framework) or address |
1448 | * (legacy clock framework) of the clock | |
1449 | * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address | |
1450 | * (legacy clock framework) of the clock | |
1451 | * - 'Cr' For a clock, it prints the current rate of the clock | |
9ac6e44e | 1452 | * |
332d2e78 LT |
1453 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 |
1454 | * function pointers are really function descriptors, which contain a | |
1455 | * pointer to the real address. | |
4d8a743c | 1456 | */ |
cf3b429b JP |
1457 | static noinline_for_stack |
1458 | char *pointer(const char *fmt, char *buf, char *end, void *ptr, | |
1459 | struct printf_spec spec) | |
78a8bf69 | 1460 | { |
725fe002 GL |
1461 | int default_width = 2 * sizeof(void *) + (spec.flags & SPECIAL ? 2 : 0); |
1462 | ||
9f36e2c4 | 1463 | if (!ptr && *fmt != 'K') { |
5e057981 JP |
1464 | /* |
1465 | * Print (null) with the same width as a pointer so it makes | |
1466 | * tabular output look nice. | |
1467 | */ | |
1468 | if (spec.field_width == -1) | |
725fe002 | 1469 | spec.field_width = default_width; |
fef20d9c | 1470 | return string(buf, end, "(null)", spec); |
5e057981 | 1471 | } |
d97106ab | 1472 | |
0fe1ef24 LT |
1473 | switch (*fmt) { |
1474 | case 'F': | |
0c8b946e | 1475 | case 'f': |
0fe1ef24 LT |
1476 | ptr = dereference_function_descriptor(ptr); |
1477 | /* Fallthrough */ | |
1478 | case 'S': | |
9ac6e44e | 1479 | case 's': |
0f77a8d3 | 1480 | case 'B': |
b0d33c2b | 1481 | return symbol_string(buf, end, ptr, spec, fmt); |
332d2e78 | 1482 | case 'R': |
c7dabef8 | 1483 | case 'r': |
fd95541e | 1484 | return resource_string(buf, end, ptr, spec, fmt); |
31550a16 AS |
1485 | case 'h': |
1486 | return hex_string(buf, end, ptr, spec, fmt); | |
dbc760bc TH |
1487 | case 'b': |
1488 | switch (fmt[1]) { | |
1489 | case 'l': | |
1490 | return bitmap_list_string(buf, end, ptr, spec, fmt); | |
1491 | default: | |
1492 | return bitmap_string(buf, end, ptr, spec, fmt); | |
1493 | } | |
8a27f7c9 JP |
1494 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
1495 | case 'm': /* Contiguous: 000102030405 */ | |
76597ff9 AE |
1496 | /* [mM]F (FDDI) */ |
1497 | /* [mM]R (Reverse order; Bluetooth) */ | |
8a27f7c9 JP |
1498 | return mac_address_string(buf, end, ptr, spec, fmt); |
1499 | case 'I': /* Formatted IP supported | |
1500 | * 4: 1.2.3.4 | |
1501 | * 6: 0001:0203:...:0708 | |
1502 | * 6c: 1::708 or 1::1.2.3.4 | |
1503 | */ | |
1504 | case 'i': /* Contiguous: | |
1505 | * 4: 001.002.003.004 | |
1506 | * 6: 000102...0f | |
1507 | */ | |
1508 | switch (fmt[1]) { | |
1509 | case '6': | |
1510 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
1511 | case '4': | |
1512 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
10679643 DB |
1513 | case 'S': { |
1514 | const union { | |
1515 | struct sockaddr raw; | |
1516 | struct sockaddr_in v4; | |
1517 | struct sockaddr_in6 v6; | |
1518 | } *sa = ptr; | |
1519 | ||
1520 | switch (sa->raw.sa_family) { | |
1521 | case AF_INET: | |
1522 | return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt); | |
1523 | case AF_INET6: | |
1524 | return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt); | |
1525 | default: | |
1526 | return string(buf, end, "(invalid address)", spec); | |
1527 | }} | |
8a27f7c9 | 1528 | } |
fef20d9c | 1529 | break; |
71dca95d AS |
1530 | case 'E': |
1531 | return escaped_string(buf, end, ptr, spec, fmt); | |
9ac6e44e JP |
1532 | case 'U': |
1533 | return uuid_string(buf, end, ptr, spec, fmt); | |
7db6f5fb | 1534 | case 'V': |
5756b76e JB |
1535 | { |
1536 | va_list va; | |
1537 | ||
1538 | va_copy(va, *((struct va_format *)ptr)->va); | |
1539 | buf += vsnprintf(buf, end > buf ? end - buf : 0, | |
1540 | ((struct va_format *)ptr)->fmt, va); | |
1541 | va_end(va); | |
1542 | return buf; | |
1543 | } | |
455cd5ab DR |
1544 | case 'K': |
1545 | /* | |
1546 | * %pK cannot be used in IRQ context because its test | |
1547 | * for CAP_SYSLOG would be meaningless. | |
1548 | */ | |
3715c530 DR |
1549 | if (kptr_restrict && (in_irq() || in_serving_softirq() || |
1550 | in_nmi())) { | |
455cd5ab | 1551 | if (spec.field_width == -1) |
725fe002 | 1552 | spec.field_width = default_width; |
455cd5ab | 1553 | return string(buf, end, "pK-error", spec); |
455cd5ab | 1554 | } |
312b4e22 RM |
1555 | |
1556 | switch (kptr_restrict) { | |
1557 | case 0: | |
1558 | /* Always print %pK values */ | |
1559 | break; | |
1560 | case 1: { | |
1561 | /* | |
1562 | * Only print the real pointer value if the current | |
1563 | * process has CAP_SYSLOG and is running with the | |
1564 | * same credentials it started with. This is because | |
1565 | * access to files is checked at open() time, but %pK | |
1566 | * checks permission at read() time. We don't want to | |
1567 | * leak pointer values if a binary opens a file using | |
1568 | * %pK and then elevates privileges before reading it. | |
1569 | */ | |
1570 | const struct cred *cred = current_cred(); | |
1571 | ||
1572 | if (!has_capability_noaudit(current, CAP_SYSLOG) || | |
1573 | !uid_eq(cred->euid, cred->uid) || | |
1574 | !gid_eq(cred->egid, cred->gid)) | |
1575 | ptr = NULL; | |
1576 | break; | |
1577 | } | |
1578 | case 2: | |
1579 | default: | |
1580 | /* Always print 0's for %pK */ | |
26297607 | 1581 | ptr = NULL; |
312b4e22 RM |
1582 | break; |
1583 | } | |
26297607 | 1584 | break; |
312b4e22 | 1585 | |
c8f44aff MM |
1586 | case 'N': |
1587 | switch (fmt[1]) { | |
1588 | case 'F': | |
1589 | return netdev_feature_string(buf, end, ptr, spec); | |
1590 | } | |
1591 | break; | |
7d799210 | 1592 | case 'a': |
aaf07621 | 1593 | return address_val(buf, end, ptr, spec, fmt); |
4b6ccca7 AV |
1594 | case 'd': |
1595 | return dentry_name(buf, end, ptr, spec, fmt); | |
900cca29 GU |
1596 | case 'C': |
1597 | return clock(buf, end, ptr, spec, fmt); | |
4b6ccca7 AV |
1598 | case 'D': |
1599 | return dentry_name(buf, end, | |
1600 | ((const struct file *)ptr)->f_path.dentry, | |
1601 | spec, fmt); | |
fef20d9c FW |
1602 | } |
1603 | spec.flags |= SMALL; | |
1604 | if (spec.field_width == -1) { | |
725fe002 | 1605 | spec.field_width = default_width; |
fef20d9c FW |
1606 | spec.flags |= ZEROPAD; |
1607 | } | |
1608 | spec.base = 16; | |
1609 | ||
1610 | return number(buf, end, (unsigned long) ptr, spec); | |
1611 | } | |
1612 | ||
1613 | /* | |
1614 | * Helper function to decode printf style format. | |
1615 | * Each call decode a token from the format and return the | |
1616 | * number of characters read (or likely the delta where it wants | |
1617 | * to go on the next call). | |
1618 | * The decoded token is returned through the parameters | |
1619 | * | |
1620 | * 'h', 'l', or 'L' for integer fields | |
1621 | * 'z' support added 23/7/1999 S.H. | |
1622 | * 'z' changed to 'Z' --davidm 1/25/99 | |
1623 | * 't' added for ptrdiff_t | |
1624 | * | |
1625 | * @fmt: the format string | |
1626 | * @type of the token returned | |
1627 | * @flags: various flags such as +, -, # tokens.. | |
1628 | * @field_width: overwritten width | |
1629 | * @base: base of the number (octal, hex, ...) | |
1630 | * @precision: precision of a number | |
1631 | * @qualifier: qualifier of a number (long, size_t, ...) | |
1632 | */ | |
cf3b429b JP |
1633 | static noinline_for_stack |
1634 | int format_decode(const char *fmt, struct printf_spec *spec) | |
fef20d9c FW |
1635 | { |
1636 | const char *start = fmt; | |
fef20d9c FW |
1637 | |
1638 | /* we finished early by reading the field width */ | |
ed681a91 | 1639 | if (spec->type == FORMAT_TYPE_WIDTH) { |
fef20d9c FW |
1640 | if (spec->field_width < 0) { |
1641 | spec->field_width = -spec->field_width; | |
1642 | spec->flags |= LEFT; | |
1643 | } | |
1644 | spec->type = FORMAT_TYPE_NONE; | |
1645 | goto precision; | |
1646 | } | |
1647 | ||
1648 | /* we finished early by reading the precision */ | |
1649 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
1650 | if (spec->precision < 0) | |
1651 | spec->precision = 0; | |
1652 | ||
1653 | spec->type = FORMAT_TYPE_NONE; | |
1654 | goto qualifier; | |
1655 | } | |
1656 | ||
1657 | /* By default */ | |
1658 | spec->type = FORMAT_TYPE_NONE; | |
1659 | ||
1660 | for (; *fmt ; ++fmt) { | |
1661 | if (*fmt == '%') | |
1662 | break; | |
1663 | } | |
1664 | ||
1665 | /* Return the current non-format string */ | |
1666 | if (fmt != start || !*fmt) | |
1667 | return fmt - start; | |
1668 | ||
1669 | /* Process flags */ | |
1670 | spec->flags = 0; | |
1671 | ||
1672 | while (1) { /* this also skips first '%' */ | |
1673 | bool found = true; | |
1674 | ||
1675 | ++fmt; | |
1676 | ||
1677 | switch (*fmt) { | |
1678 | case '-': spec->flags |= LEFT; break; | |
1679 | case '+': spec->flags |= PLUS; break; | |
1680 | case ' ': spec->flags |= SPACE; break; | |
1681 | case '#': spec->flags |= SPECIAL; break; | |
1682 | case '0': spec->flags |= ZEROPAD; break; | |
1683 | default: found = false; | |
1684 | } | |
1685 | ||
1686 | if (!found) | |
1687 | break; | |
1688 | } | |
1689 | ||
1690 | /* get field width */ | |
1691 | spec->field_width = -1; | |
1692 | ||
1693 | if (isdigit(*fmt)) | |
1694 | spec->field_width = skip_atoi(&fmt); | |
1695 | else if (*fmt == '*') { | |
1696 | /* it's the next argument */ | |
ed681a91 | 1697 | spec->type = FORMAT_TYPE_WIDTH; |
fef20d9c FW |
1698 | return ++fmt - start; |
1699 | } | |
1700 | ||
1701 | precision: | |
1702 | /* get the precision */ | |
1703 | spec->precision = -1; | |
1704 | if (*fmt == '.') { | |
1705 | ++fmt; | |
1706 | if (isdigit(*fmt)) { | |
1707 | spec->precision = skip_atoi(&fmt); | |
1708 | if (spec->precision < 0) | |
1709 | spec->precision = 0; | |
1710 | } else if (*fmt == '*') { | |
1711 | /* it's the next argument */ | |
adf26f84 | 1712 | spec->type = FORMAT_TYPE_PRECISION; |
fef20d9c FW |
1713 | return ++fmt - start; |
1714 | } | |
1715 | } | |
1716 | ||
1717 | qualifier: | |
1718 | /* get the conversion qualifier */ | |
1719 | spec->qualifier = -1; | |
75fb8f26 AS |
1720 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
1721 | _tolower(*fmt) == 'z' || *fmt == 't') { | |
a4e94ef0 Z |
1722 | spec->qualifier = *fmt++; |
1723 | if (unlikely(spec->qualifier == *fmt)) { | |
1724 | if (spec->qualifier == 'l') { | |
1725 | spec->qualifier = 'L'; | |
1726 | ++fmt; | |
1727 | } else if (spec->qualifier == 'h') { | |
1728 | spec->qualifier = 'H'; | |
1729 | ++fmt; | |
1730 | } | |
fef20d9c FW |
1731 | } |
1732 | } | |
1733 | ||
1734 | /* default base */ | |
1735 | spec->base = 10; | |
1736 | switch (*fmt) { | |
1737 | case 'c': | |
1738 | spec->type = FORMAT_TYPE_CHAR; | |
1739 | return ++fmt - start; | |
1740 | ||
1741 | case 's': | |
1742 | spec->type = FORMAT_TYPE_STR; | |
1743 | return ++fmt - start; | |
1744 | ||
1745 | case 'p': | |
1746 | spec->type = FORMAT_TYPE_PTR; | |
ffbfed03 | 1747 | return ++fmt - start; |
fef20d9c | 1748 | |
fef20d9c FW |
1749 | case '%': |
1750 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
1751 | return ++fmt - start; | |
1752 | ||
1753 | /* integer number formats - set up the flags and "break" */ | |
1754 | case 'o': | |
1755 | spec->base = 8; | |
1756 | break; | |
1757 | ||
1758 | case 'x': | |
1759 | spec->flags |= SMALL; | |
1760 | ||
1761 | case 'X': | |
1762 | spec->base = 16; | |
1763 | break; | |
1764 | ||
1765 | case 'd': | |
1766 | case 'i': | |
39e874f8 | 1767 | spec->flags |= SIGN; |
fef20d9c | 1768 | case 'u': |
4aa99606 | 1769 | break; |
fef20d9c | 1770 | |
708d96fd RM |
1771 | case 'n': |
1772 | /* | |
1773 | * Since %n poses a greater security risk than utility, treat | |
1774 | * it as an invalid format specifier. Warn about its use so | |
1775 | * that new instances don't get added. | |
1776 | */ | |
1777 | WARN_ONCE(1, "Please remove ignored %%n in '%s'\n", fmt); | |
1778 | /* Fall-through */ | |
1779 | ||
fef20d9c FW |
1780 | default: |
1781 | spec->type = FORMAT_TYPE_INVALID; | |
1782 | return fmt - start; | |
0fe1ef24 | 1783 | } |
fef20d9c FW |
1784 | |
1785 | if (spec->qualifier == 'L') | |
1786 | spec->type = FORMAT_TYPE_LONG_LONG; | |
1787 | else if (spec->qualifier == 'l') { | |
51be17df RV |
1788 | BUILD_BUG_ON(FORMAT_TYPE_ULONG + SIGN != FORMAT_TYPE_LONG); |
1789 | spec->type = FORMAT_TYPE_ULONG + (spec->flags & SIGN); | |
75fb8f26 | 1790 | } else if (_tolower(spec->qualifier) == 'z') { |
fef20d9c FW |
1791 | spec->type = FORMAT_TYPE_SIZE_T; |
1792 | } else if (spec->qualifier == 't') { | |
1793 | spec->type = FORMAT_TYPE_PTRDIFF; | |
a4e94ef0 | 1794 | } else if (spec->qualifier == 'H') { |
51be17df RV |
1795 | BUILD_BUG_ON(FORMAT_TYPE_UBYTE + SIGN != FORMAT_TYPE_BYTE); |
1796 | spec->type = FORMAT_TYPE_UBYTE + (spec->flags & SIGN); | |
fef20d9c | 1797 | } else if (spec->qualifier == 'h') { |
51be17df RV |
1798 | BUILD_BUG_ON(FORMAT_TYPE_USHORT + SIGN != FORMAT_TYPE_SHORT); |
1799 | spec->type = FORMAT_TYPE_USHORT + (spec->flags & SIGN); | |
fef20d9c | 1800 | } else { |
51be17df RV |
1801 | BUILD_BUG_ON(FORMAT_TYPE_UINT + SIGN != FORMAT_TYPE_INT); |
1802 | spec->type = FORMAT_TYPE_UINT + (spec->flags & SIGN); | |
78a8bf69 | 1803 | } |
fef20d9c FW |
1804 | |
1805 | return ++fmt - start; | |
78a8bf69 LT |
1806 | } |
1807 | ||
1da177e4 LT |
1808 | /** |
1809 | * vsnprintf - Format a string and place it in a buffer | |
1810 | * @buf: The buffer to place the result into | |
1811 | * @size: The size of the buffer, including the trailing null space | |
1812 | * @fmt: The format string to use | |
1813 | * @args: Arguments for the format string | |
1814 | * | |
20036fdc | 1815 | * This function follows C99 vsnprintf, but has some extensions: |
91adcd2c SR |
1816 | * %pS output the name of a text symbol with offset |
1817 | * %ps output the name of a text symbol without offset | |
0c8b946e FW |
1818 | * %pF output the name of a function pointer with its offset |
1819 | * %pf output the name of a function pointer without its offset | |
0f77a8d3 | 1820 | * %pB output the name of a backtrace symbol with its offset |
8a79503a UKK |
1821 | * %pR output the address range in a struct resource with decoded flags |
1822 | * %pr output the address range in a struct resource with raw flags | |
dbc760bc TH |
1823 | * %pb output the bitmap with field width as the number of bits |
1824 | * %pbl output the bitmap as range list with field width as the number of bits | |
8a79503a | 1825 | * %pM output a 6-byte MAC address with colons |
7c59154e AS |
1826 | * %pMR output a 6-byte MAC address with colons in reversed order |
1827 | * %pMF output a 6-byte MAC address with dashes | |
8a79503a | 1828 | * %pm output a 6-byte MAC address without colons |
7c59154e | 1829 | * %pmR output a 6-byte MAC address without colons in reversed order |
8a79503a UKK |
1830 | * %pI4 print an IPv4 address without leading zeros |
1831 | * %pi4 print an IPv4 address with leading zeros | |
1832 | * %pI6 print an IPv6 address with colons | |
1833 | * %pi6 print an IPv6 address without colons | |
f996f208 | 1834 | * %pI6c print an IPv6 address as specified by RFC 5952 |
10679643 DB |
1835 | * %pIS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address |
1836 | * %piS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address | |
8a79503a UKK |
1837 | * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper |
1838 | * case. | |
71dca95d | 1839 | * %*pE[achnops] print an escaped buffer |
31550a16 AS |
1840 | * %*ph[CDN] a variable-length hex string with a separator (supports up to 64 |
1841 | * bytes of the input) | |
900cca29 GU |
1842 | * %pC output the name (Common Clock Framework) or address (legacy clock |
1843 | * framework) of a clock | |
1844 | * %pCn output the name (Common Clock Framework) or address (legacy clock | |
1845 | * framework) of a clock | |
1846 | * %pCr output the current rate of a clock | |
0efb4d20 | 1847 | * %n is ignored |
20036fdc | 1848 | * |
80f548e0 AM |
1849 | * ** Please update Documentation/printk-formats.txt when making changes ** |
1850 | * | |
1da177e4 LT |
1851 | * The return value is the number of characters which would |
1852 | * be generated for the given input, excluding the trailing | |
1853 | * '\0', as per ISO C99. If you want to have the exact | |
1854 | * number of characters written into @buf as return value | |
72fd4a35 | 1855 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
1856 | * return is greater than or equal to @size, the resulting |
1857 | * string is truncated. | |
1858 | * | |
ba1835eb | 1859 | * If you're not already dealing with a va_list consider using snprintf(). |
1da177e4 LT |
1860 | */ |
1861 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1862 | { | |
1da177e4 | 1863 | unsigned long long num; |
d4be151b | 1864 | char *str, *end; |
fef20d9c | 1865 | struct printf_spec spec = {0}; |
1da177e4 | 1866 | |
f796937a JF |
1867 | /* Reject out-of-range values early. Large positive sizes are |
1868 | used for unknown buffer sizes. */ | |
2aa2f9e2 | 1869 | if (WARN_ON_ONCE(size > INT_MAX)) |
1da177e4 | 1870 | return 0; |
1da177e4 LT |
1871 | |
1872 | str = buf; | |
f796937a | 1873 | end = buf + size; |
1da177e4 | 1874 | |
f796937a JF |
1875 | /* Make sure end is always >= buf */ |
1876 | if (end < buf) { | |
1877 | end = ((void *)-1); | |
1878 | size = end - buf; | |
1da177e4 LT |
1879 | } |
1880 | ||
fef20d9c FW |
1881 | while (*fmt) { |
1882 | const char *old_fmt = fmt; | |
d4be151b | 1883 | int read = format_decode(fmt, &spec); |
1da177e4 | 1884 | |
fef20d9c | 1885 | fmt += read; |
1da177e4 | 1886 | |
fef20d9c FW |
1887 | switch (spec.type) { |
1888 | case FORMAT_TYPE_NONE: { | |
1889 | int copy = read; | |
1890 | if (str < end) { | |
1891 | if (copy > end - str) | |
1892 | copy = end - str; | |
1893 | memcpy(str, old_fmt, copy); | |
1da177e4 | 1894 | } |
fef20d9c FW |
1895 | str += read; |
1896 | break; | |
1da177e4 LT |
1897 | } |
1898 | ||
ed681a91 | 1899 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1900 | spec.field_width = va_arg(args, int); |
1901 | break; | |
1da177e4 | 1902 | |
fef20d9c FW |
1903 | case FORMAT_TYPE_PRECISION: |
1904 | spec.precision = va_arg(args, int); | |
1905 | break; | |
1da177e4 | 1906 | |
d4be151b AGR |
1907 | case FORMAT_TYPE_CHAR: { |
1908 | char c; | |
1909 | ||
fef20d9c FW |
1910 | if (!(spec.flags & LEFT)) { |
1911 | while (--spec.field_width > 0) { | |
f796937a | 1912 | if (str < end) |
1da177e4 LT |
1913 | *str = ' '; |
1914 | ++str; | |
1da177e4 | 1915 | |
fef20d9c FW |
1916 | } |
1917 | } | |
1918 | c = (unsigned char) va_arg(args, int); | |
1919 | if (str < end) | |
1920 | *str = c; | |
1921 | ++str; | |
1922 | while (--spec.field_width > 0) { | |
f796937a | 1923 | if (str < end) |
fef20d9c | 1924 | *str = ' '; |
1da177e4 | 1925 | ++str; |
fef20d9c FW |
1926 | } |
1927 | break; | |
d4be151b | 1928 | } |
1da177e4 | 1929 | |
fef20d9c FW |
1930 | case FORMAT_TYPE_STR: |
1931 | str = string(str, end, va_arg(args, char *), spec); | |
1932 | break; | |
1da177e4 | 1933 | |
fef20d9c | 1934 | case FORMAT_TYPE_PTR: |
ffbfed03 | 1935 | str = pointer(fmt, str, end, va_arg(args, void *), |
fef20d9c FW |
1936 | spec); |
1937 | while (isalnum(*fmt)) | |
1938 | fmt++; | |
1939 | break; | |
1da177e4 | 1940 | |
fef20d9c FW |
1941 | case FORMAT_TYPE_PERCENT_CHAR: |
1942 | if (str < end) | |
1943 | *str = '%'; | |
1944 | ++str; | |
1945 | break; | |
1da177e4 | 1946 | |
fef20d9c FW |
1947 | case FORMAT_TYPE_INVALID: |
1948 | if (str < end) | |
1949 | *str = '%'; | |
1950 | ++str; | |
fef20d9c FW |
1951 | break; |
1952 | ||
fef20d9c FW |
1953 | default: |
1954 | switch (spec.type) { | |
1955 | case FORMAT_TYPE_LONG_LONG: | |
1956 | num = va_arg(args, long long); | |
1957 | break; | |
1958 | case FORMAT_TYPE_ULONG: | |
1959 | num = va_arg(args, unsigned long); | |
1960 | break; | |
1961 | case FORMAT_TYPE_LONG: | |
1962 | num = va_arg(args, long); | |
1963 | break; | |
1964 | case FORMAT_TYPE_SIZE_T: | |
ef124960 JG |
1965 | if (spec.flags & SIGN) |
1966 | num = va_arg(args, ssize_t); | |
1967 | else | |
1968 | num = va_arg(args, size_t); | |
fef20d9c FW |
1969 | break; |
1970 | case FORMAT_TYPE_PTRDIFF: | |
1971 | num = va_arg(args, ptrdiff_t); | |
1972 | break; | |
a4e94ef0 Z |
1973 | case FORMAT_TYPE_UBYTE: |
1974 | num = (unsigned char) va_arg(args, int); | |
1975 | break; | |
1976 | case FORMAT_TYPE_BYTE: | |
1977 | num = (signed char) va_arg(args, int); | |
1978 | break; | |
fef20d9c FW |
1979 | case FORMAT_TYPE_USHORT: |
1980 | num = (unsigned short) va_arg(args, int); | |
1981 | break; | |
1982 | case FORMAT_TYPE_SHORT: | |
1983 | num = (short) va_arg(args, int); | |
1984 | break; | |
39e874f8 FW |
1985 | case FORMAT_TYPE_INT: |
1986 | num = (int) va_arg(args, int); | |
fef20d9c FW |
1987 | break; |
1988 | default: | |
1989 | num = va_arg(args, unsigned int); | |
1990 | } | |
1991 | ||
1992 | str = number(str, end, num, spec); | |
1da177e4 | 1993 | } |
1da177e4 | 1994 | } |
fef20d9c | 1995 | |
f796937a JF |
1996 | if (size > 0) { |
1997 | if (str < end) | |
1998 | *str = '\0'; | |
1999 | else | |
0a6047ee | 2000 | end[-1] = '\0'; |
f796937a | 2001 | } |
fef20d9c | 2002 | |
f796937a | 2003 | /* the trailing null byte doesn't count towards the total */ |
1da177e4 | 2004 | return str-buf; |
fef20d9c | 2005 | |
1da177e4 | 2006 | } |
1da177e4 LT |
2007 | EXPORT_SYMBOL(vsnprintf); |
2008 | ||
2009 | /** | |
2010 | * vscnprintf - Format a string and place it in a buffer | |
2011 | * @buf: The buffer to place the result into | |
2012 | * @size: The size of the buffer, including the trailing null space | |
2013 | * @fmt: The format string to use | |
2014 | * @args: Arguments for the format string | |
2015 | * | |
2016 | * The return value is the number of characters which have been written into | |
b921c69f | 2017 | * the @buf not including the trailing '\0'. If @size is == 0 the function |
1da177e4 LT |
2018 | * returns 0. |
2019 | * | |
ba1835eb | 2020 | * If you're not already dealing with a va_list consider using scnprintf(). |
20036fdc AK |
2021 | * |
2022 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
2023 | */ |
2024 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
2025 | { | |
2026 | int i; | |
2027 | ||
7b9186f5 AGR |
2028 | i = vsnprintf(buf, size, fmt, args); |
2029 | ||
b921c69f AA |
2030 | if (likely(i < size)) |
2031 | return i; | |
2032 | if (size != 0) | |
2033 | return size - 1; | |
2034 | return 0; | |
1da177e4 | 2035 | } |
1da177e4 LT |
2036 | EXPORT_SYMBOL(vscnprintf); |
2037 | ||
2038 | /** | |
2039 | * snprintf - Format a string and place it in a buffer | |
2040 | * @buf: The buffer to place the result into | |
2041 | * @size: The size of the buffer, including the trailing null space | |
2042 | * @fmt: The format string to use | |
2043 | * @...: Arguments for the format string | |
2044 | * | |
2045 | * The return value is the number of characters which would be | |
2046 | * generated for the given input, excluding the trailing null, | |
2047 | * as per ISO C99. If the return is greater than or equal to | |
2048 | * @size, the resulting string is truncated. | |
20036fdc AK |
2049 | * |
2050 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 2051 | */ |
7b9186f5 | 2052 | int snprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
2053 | { |
2054 | va_list args; | |
2055 | int i; | |
2056 | ||
2057 | va_start(args, fmt); | |
7b9186f5 | 2058 | i = vsnprintf(buf, size, fmt, args); |
1da177e4 | 2059 | va_end(args); |
7b9186f5 | 2060 | |
1da177e4 LT |
2061 | return i; |
2062 | } | |
1da177e4 LT |
2063 | EXPORT_SYMBOL(snprintf); |
2064 | ||
2065 | /** | |
2066 | * scnprintf - Format a string and place it in a buffer | |
2067 | * @buf: The buffer to place the result into | |
2068 | * @size: The size of the buffer, including the trailing null space | |
2069 | * @fmt: The format string to use | |
2070 | * @...: Arguments for the format string | |
2071 | * | |
2072 | * The return value is the number of characters written into @buf not including | |
b903c0b8 | 2073 | * the trailing '\0'. If @size is == 0 the function returns 0. |
1da177e4 LT |
2074 | */ |
2075 | ||
7b9186f5 | 2076 | int scnprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
2077 | { |
2078 | va_list args; | |
2079 | int i; | |
2080 | ||
2081 | va_start(args, fmt); | |
b921c69f | 2082 | i = vscnprintf(buf, size, fmt, args); |
1da177e4 | 2083 | va_end(args); |
7b9186f5 | 2084 | |
b921c69f | 2085 | return i; |
1da177e4 LT |
2086 | } |
2087 | EXPORT_SYMBOL(scnprintf); | |
2088 | ||
2089 | /** | |
2090 | * vsprintf - Format a string and place it in a buffer | |
2091 | * @buf: The buffer to place the result into | |
2092 | * @fmt: The format string to use | |
2093 | * @args: Arguments for the format string | |
2094 | * | |
2095 | * The function returns the number of characters written | |
72fd4a35 | 2096 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
2097 | * buffer overflows. |
2098 | * | |
ba1835eb | 2099 | * If you're not already dealing with a va_list consider using sprintf(). |
20036fdc AK |
2100 | * |
2101 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
2102 | */ |
2103 | int vsprintf(char *buf, const char *fmt, va_list args) | |
2104 | { | |
2105 | return vsnprintf(buf, INT_MAX, fmt, args); | |
2106 | } | |
1da177e4 LT |
2107 | EXPORT_SYMBOL(vsprintf); |
2108 | ||
2109 | /** | |
2110 | * sprintf - Format a string and place it in a buffer | |
2111 | * @buf: The buffer to place the result into | |
2112 | * @fmt: The format string to use | |
2113 | * @...: Arguments for the format string | |
2114 | * | |
2115 | * The function returns the number of characters written | |
72fd4a35 | 2116 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 | 2117 | * buffer overflows. |
20036fdc AK |
2118 | * |
2119 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 2120 | */ |
7b9186f5 | 2121 | int sprintf(char *buf, const char *fmt, ...) |
1da177e4 LT |
2122 | { |
2123 | va_list args; | |
2124 | int i; | |
2125 | ||
2126 | va_start(args, fmt); | |
7b9186f5 | 2127 | i = vsnprintf(buf, INT_MAX, fmt, args); |
1da177e4 | 2128 | va_end(args); |
7b9186f5 | 2129 | |
1da177e4 LT |
2130 | return i; |
2131 | } | |
1da177e4 LT |
2132 | EXPORT_SYMBOL(sprintf); |
2133 | ||
4370aa4a LJ |
2134 | #ifdef CONFIG_BINARY_PRINTF |
2135 | /* | |
2136 | * bprintf service: | |
2137 | * vbin_printf() - VA arguments to binary data | |
2138 | * bstr_printf() - Binary data to text string | |
2139 | */ | |
2140 | ||
2141 | /** | |
2142 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
2143 | * @bin_buf: The buffer to place args' binary value | |
2144 | * @size: The size of the buffer(by words(32bits), not characters) | |
2145 | * @fmt: The format string to use | |
2146 | * @args: Arguments for the format string | |
2147 | * | |
2148 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
da3dae54 | 2149 | * is skipped. |
4370aa4a LJ |
2150 | * |
2151 | * The return value is the number of words(32bits) which would be generated for | |
2152 | * the given input. | |
2153 | * | |
2154 | * NOTE: | |
2155 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
2156 | * valid for bstr_printf(). | |
2157 | */ | |
2158 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
2159 | { | |
fef20d9c | 2160 | struct printf_spec spec = {0}; |
4370aa4a | 2161 | char *str, *end; |
4370aa4a LJ |
2162 | |
2163 | str = (char *)bin_buf; | |
2164 | end = (char *)(bin_buf + size); | |
2165 | ||
2166 | #define save_arg(type) \ | |
2167 | do { \ | |
2168 | if (sizeof(type) == 8) { \ | |
2169 | unsigned long long value; \ | |
2170 | str = PTR_ALIGN(str, sizeof(u32)); \ | |
2171 | value = va_arg(args, unsigned long long); \ | |
2172 | if (str + sizeof(type) <= end) { \ | |
2173 | *(u32 *)str = *(u32 *)&value; \ | |
2174 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ | |
2175 | } \ | |
2176 | } else { \ | |
2177 | unsigned long value; \ | |
2178 | str = PTR_ALIGN(str, sizeof(type)); \ | |
2179 | value = va_arg(args, int); \ | |
2180 | if (str + sizeof(type) <= end) \ | |
2181 | *(typeof(type) *)str = (type)value; \ | |
2182 | } \ | |
2183 | str += sizeof(type); \ | |
2184 | } while (0) | |
2185 | ||
fef20d9c | 2186 | while (*fmt) { |
d4be151b | 2187 | int read = format_decode(fmt, &spec); |
4370aa4a | 2188 | |
fef20d9c | 2189 | fmt += read; |
4370aa4a | 2190 | |
fef20d9c FW |
2191 | switch (spec.type) { |
2192 | case FORMAT_TYPE_NONE: | |
d4be151b AGR |
2193 | case FORMAT_TYPE_INVALID: |
2194 | case FORMAT_TYPE_PERCENT_CHAR: | |
fef20d9c FW |
2195 | break; |
2196 | ||
ed681a91 | 2197 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
2198 | case FORMAT_TYPE_PRECISION: |
2199 | save_arg(int); | |
2200 | break; | |
2201 | ||
2202 | case FORMAT_TYPE_CHAR: | |
4370aa4a | 2203 | save_arg(char); |
fef20d9c FW |
2204 | break; |
2205 | ||
2206 | case FORMAT_TYPE_STR: { | |
4370aa4a LJ |
2207 | const char *save_str = va_arg(args, char *); |
2208 | size_t len; | |
6c356634 | 2209 | |
4370aa4a LJ |
2210 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE |
2211 | || (unsigned long)save_str < PAGE_SIZE) | |
0f4f81dc | 2212 | save_str = "(null)"; |
6c356634 AGR |
2213 | len = strlen(save_str) + 1; |
2214 | if (str + len < end) | |
2215 | memcpy(str, save_str, len); | |
2216 | str += len; | |
fef20d9c | 2217 | break; |
4370aa4a | 2218 | } |
fef20d9c FW |
2219 | |
2220 | case FORMAT_TYPE_PTR: | |
4370aa4a LJ |
2221 | save_arg(void *); |
2222 | /* skip all alphanumeric pointer suffixes */ | |
fef20d9c | 2223 | while (isalnum(*fmt)) |
4370aa4a | 2224 | fmt++; |
fef20d9c FW |
2225 | break; |
2226 | ||
fef20d9c FW |
2227 | default: |
2228 | switch (spec.type) { | |
2229 | ||
2230 | case FORMAT_TYPE_LONG_LONG: | |
4370aa4a | 2231 | save_arg(long long); |
fef20d9c FW |
2232 | break; |
2233 | case FORMAT_TYPE_ULONG: | |
2234 | case FORMAT_TYPE_LONG: | |
4370aa4a | 2235 | save_arg(unsigned long); |
fef20d9c FW |
2236 | break; |
2237 | case FORMAT_TYPE_SIZE_T: | |
4370aa4a | 2238 | save_arg(size_t); |
fef20d9c FW |
2239 | break; |
2240 | case FORMAT_TYPE_PTRDIFF: | |
4370aa4a | 2241 | save_arg(ptrdiff_t); |
fef20d9c | 2242 | break; |
a4e94ef0 Z |
2243 | case FORMAT_TYPE_UBYTE: |
2244 | case FORMAT_TYPE_BYTE: | |
2245 | save_arg(char); | |
2246 | break; | |
fef20d9c FW |
2247 | case FORMAT_TYPE_USHORT: |
2248 | case FORMAT_TYPE_SHORT: | |
4370aa4a | 2249 | save_arg(short); |
fef20d9c FW |
2250 | break; |
2251 | default: | |
4370aa4a | 2252 | save_arg(int); |
fef20d9c | 2253 | } |
4370aa4a LJ |
2254 | } |
2255 | } | |
fef20d9c | 2256 | |
7b9186f5 | 2257 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
fef20d9c | 2258 | #undef save_arg |
4370aa4a LJ |
2259 | } |
2260 | EXPORT_SYMBOL_GPL(vbin_printf); | |
2261 | ||
2262 | /** | |
2263 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
2264 | * @buf: The buffer to place the result into | |
2265 | * @size: The size of the buffer, including the trailing null space | |
2266 | * @fmt: The format string to use | |
2267 | * @bin_buf: Binary arguments for the format string | |
2268 | * | |
2269 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
2270 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
2271 | * a binary buffer that generated by vbin_printf. | |
2272 | * | |
2273 | * The format follows C99 vsnprintf, but has some extensions: | |
0efb4d20 | 2274 | * see vsnprintf comment for details. |
4370aa4a LJ |
2275 | * |
2276 | * The return value is the number of characters which would | |
2277 | * be generated for the given input, excluding the trailing | |
2278 | * '\0', as per ISO C99. If you want to have the exact | |
2279 | * number of characters written into @buf as return value | |
2280 | * (not including the trailing '\0'), use vscnprintf(). If the | |
2281 | * return is greater than or equal to @size, the resulting | |
2282 | * string is truncated. | |
2283 | */ | |
2284 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
2285 | { | |
fef20d9c | 2286 | struct printf_spec spec = {0}; |
d4be151b AGR |
2287 | char *str, *end; |
2288 | const char *args = (const char *)bin_buf; | |
4370aa4a | 2289 | |
2f30b1f9 | 2290 | if (WARN_ON_ONCE((int) size < 0)) |
4370aa4a | 2291 | return 0; |
4370aa4a LJ |
2292 | |
2293 | str = buf; | |
2294 | end = buf + size; | |
2295 | ||
2296 | #define get_arg(type) \ | |
2297 | ({ \ | |
2298 | typeof(type) value; \ | |
2299 | if (sizeof(type) == 8) { \ | |
2300 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
2301 | *(u32 *)&value = *(u32 *)args; \ | |
2302 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
2303 | } else { \ | |
2304 | args = PTR_ALIGN(args, sizeof(type)); \ | |
2305 | value = *(typeof(type) *)args; \ | |
2306 | } \ | |
2307 | args += sizeof(type); \ | |
2308 | value; \ | |
2309 | }) | |
2310 | ||
2311 | /* Make sure end is always >= buf */ | |
2312 | if (end < buf) { | |
2313 | end = ((void *)-1); | |
2314 | size = end - buf; | |
2315 | } | |
2316 | ||
fef20d9c | 2317 | while (*fmt) { |
fef20d9c | 2318 | const char *old_fmt = fmt; |
d4be151b | 2319 | int read = format_decode(fmt, &spec); |
4370aa4a | 2320 | |
fef20d9c | 2321 | fmt += read; |
4370aa4a | 2322 | |
fef20d9c FW |
2323 | switch (spec.type) { |
2324 | case FORMAT_TYPE_NONE: { | |
2325 | int copy = read; | |
2326 | if (str < end) { | |
2327 | if (copy > end - str) | |
2328 | copy = end - str; | |
2329 | memcpy(str, old_fmt, copy); | |
4370aa4a | 2330 | } |
fef20d9c FW |
2331 | str += read; |
2332 | break; | |
4370aa4a LJ |
2333 | } |
2334 | ||
ed681a91 | 2335 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
2336 | spec.field_width = get_arg(int); |
2337 | break; | |
4370aa4a | 2338 | |
fef20d9c FW |
2339 | case FORMAT_TYPE_PRECISION: |
2340 | spec.precision = get_arg(int); | |
2341 | break; | |
4370aa4a | 2342 | |
d4be151b AGR |
2343 | case FORMAT_TYPE_CHAR: { |
2344 | char c; | |
2345 | ||
fef20d9c FW |
2346 | if (!(spec.flags & LEFT)) { |
2347 | while (--spec.field_width > 0) { | |
4370aa4a LJ |
2348 | if (str < end) |
2349 | *str = ' '; | |
2350 | ++str; | |
2351 | } | |
2352 | } | |
2353 | c = (unsigned char) get_arg(char); | |
2354 | if (str < end) | |
2355 | *str = c; | |
2356 | ++str; | |
fef20d9c | 2357 | while (--spec.field_width > 0) { |
4370aa4a LJ |
2358 | if (str < end) |
2359 | *str = ' '; | |
2360 | ++str; | |
2361 | } | |
fef20d9c | 2362 | break; |
d4be151b | 2363 | } |
4370aa4a | 2364 | |
fef20d9c | 2365 | case FORMAT_TYPE_STR: { |
4370aa4a | 2366 | const char *str_arg = args; |
d4be151b | 2367 | args += strlen(str_arg) + 1; |
fef20d9c FW |
2368 | str = string(str, end, (char *)str_arg, spec); |
2369 | break; | |
4370aa4a LJ |
2370 | } |
2371 | ||
fef20d9c | 2372 | case FORMAT_TYPE_PTR: |
ffbfed03 | 2373 | str = pointer(fmt, str, end, get_arg(void *), spec); |
fef20d9c | 2374 | while (isalnum(*fmt)) |
4370aa4a | 2375 | fmt++; |
fef20d9c | 2376 | break; |
4370aa4a | 2377 | |
fef20d9c | 2378 | case FORMAT_TYPE_PERCENT_CHAR: |
fef20d9c | 2379 | case FORMAT_TYPE_INVALID: |
4370aa4a LJ |
2380 | if (str < end) |
2381 | *str = '%'; | |
2382 | ++str; | |
fef20d9c FW |
2383 | break; |
2384 | ||
d4be151b AGR |
2385 | default: { |
2386 | unsigned long long num; | |
2387 | ||
fef20d9c FW |
2388 | switch (spec.type) { |
2389 | ||
2390 | case FORMAT_TYPE_LONG_LONG: | |
2391 | num = get_arg(long long); | |
2392 | break; | |
2393 | case FORMAT_TYPE_ULONG: | |
fef20d9c FW |
2394 | case FORMAT_TYPE_LONG: |
2395 | num = get_arg(unsigned long); | |
2396 | break; | |
2397 | case FORMAT_TYPE_SIZE_T: | |
2398 | num = get_arg(size_t); | |
2399 | break; | |
2400 | case FORMAT_TYPE_PTRDIFF: | |
2401 | num = get_arg(ptrdiff_t); | |
2402 | break; | |
a4e94ef0 Z |
2403 | case FORMAT_TYPE_UBYTE: |
2404 | num = get_arg(unsigned char); | |
2405 | break; | |
2406 | case FORMAT_TYPE_BYTE: | |
2407 | num = get_arg(signed char); | |
2408 | break; | |
fef20d9c FW |
2409 | case FORMAT_TYPE_USHORT: |
2410 | num = get_arg(unsigned short); | |
2411 | break; | |
2412 | case FORMAT_TYPE_SHORT: | |
2413 | num = get_arg(short); | |
2414 | break; | |
2415 | case FORMAT_TYPE_UINT: | |
2416 | num = get_arg(unsigned int); | |
2417 | break; | |
2418 | default: | |
2419 | num = get_arg(int); | |
2420 | } | |
2421 | ||
2422 | str = number(str, end, num, spec); | |
d4be151b AGR |
2423 | } /* default: */ |
2424 | } /* switch(spec.type) */ | |
2425 | } /* while(*fmt) */ | |
fef20d9c | 2426 | |
4370aa4a LJ |
2427 | if (size > 0) { |
2428 | if (str < end) | |
2429 | *str = '\0'; | |
2430 | else | |
2431 | end[-1] = '\0'; | |
2432 | } | |
fef20d9c | 2433 | |
4370aa4a LJ |
2434 | #undef get_arg |
2435 | ||
2436 | /* the trailing null byte doesn't count towards the total */ | |
2437 | return str - buf; | |
2438 | } | |
2439 | EXPORT_SYMBOL_GPL(bstr_printf); | |
2440 | ||
2441 | /** | |
2442 | * bprintf - Parse a format string and place args' binary value in a buffer | |
2443 | * @bin_buf: The buffer to place args' binary value | |
2444 | * @size: The size of the buffer(by words(32bits), not characters) | |
2445 | * @fmt: The format string to use | |
2446 | * @...: Arguments for the format string | |
2447 | * | |
2448 | * The function returns the number of words(u32) written | |
2449 | * into @bin_buf. | |
2450 | */ | |
2451 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
2452 | { | |
2453 | va_list args; | |
2454 | int ret; | |
2455 | ||
2456 | va_start(args, fmt); | |
2457 | ret = vbin_printf(bin_buf, size, fmt, args); | |
2458 | va_end(args); | |
7b9186f5 | 2459 | |
4370aa4a LJ |
2460 | return ret; |
2461 | } | |
2462 | EXPORT_SYMBOL_GPL(bprintf); | |
2463 | ||
2464 | #endif /* CONFIG_BINARY_PRINTF */ | |
2465 | ||
1da177e4 LT |
2466 | /** |
2467 | * vsscanf - Unformat a buffer into a list of arguments | |
2468 | * @buf: input buffer | |
2469 | * @fmt: format of buffer | |
2470 | * @args: arguments | |
2471 | */ | |
7b9186f5 | 2472 | int vsscanf(const char *buf, const char *fmt, va_list args) |
1da177e4 LT |
2473 | { |
2474 | const char *str = buf; | |
2475 | char *next; | |
2476 | char digit; | |
2477 | int num = 0; | |
ef0658f3 | 2478 | u8 qualifier; |
53809751 JB |
2479 | unsigned int base; |
2480 | union { | |
2481 | long long s; | |
2482 | unsigned long long u; | |
2483 | } val; | |
ef0658f3 | 2484 | s16 field_width; |
d4be151b | 2485 | bool is_sign; |
1da177e4 | 2486 | |
da99075c | 2487 | while (*fmt) { |
1da177e4 LT |
2488 | /* skip any white space in format */ |
2489 | /* white space in format matchs any amount of | |
2490 | * white space, including none, in the input. | |
2491 | */ | |
2492 | if (isspace(*fmt)) { | |
e7d2860b AGR |
2493 | fmt = skip_spaces(++fmt); |
2494 | str = skip_spaces(str); | |
1da177e4 LT |
2495 | } |
2496 | ||
2497 | /* anything that is not a conversion must match exactly */ | |
2498 | if (*fmt != '%' && *fmt) { | |
2499 | if (*fmt++ != *str++) | |
2500 | break; | |
2501 | continue; | |
2502 | } | |
2503 | ||
2504 | if (!*fmt) | |
2505 | break; | |
2506 | ++fmt; | |
7b9186f5 | 2507 | |
1da177e4 LT |
2508 | /* skip this conversion. |
2509 | * advance both strings to next white space | |
2510 | */ | |
2511 | if (*fmt == '*') { | |
da99075c JB |
2512 | if (!*str) |
2513 | break; | |
8fccae2c | 2514 | while (!isspace(*fmt) && *fmt != '%' && *fmt) |
1da177e4 LT |
2515 | fmt++; |
2516 | while (!isspace(*str) && *str) | |
2517 | str++; | |
2518 | continue; | |
2519 | } | |
2520 | ||
2521 | /* get field width */ | |
2522 | field_width = -1; | |
53809751 | 2523 | if (isdigit(*fmt)) { |
1da177e4 | 2524 | field_width = skip_atoi(&fmt); |
53809751 JB |
2525 | if (field_width <= 0) |
2526 | break; | |
2527 | } | |
1da177e4 LT |
2528 | |
2529 | /* get conversion qualifier */ | |
2530 | qualifier = -1; | |
75fb8f26 AS |
2531 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
2532 | _tolower(*fmt) == 'z') { | |
1da177e4 LT |
2533 | qualifier = *fmt++; |
2534 | if (unlikely(qualifier == *fmt)) { | |
2535 | if (qualifier == 'h') { | |
2536 | qualifier = 'H'; | |
2537 | fmt++; | |
2538 | } else if (qualifier == 'l') { | |
2539 | qualifier = 'L'; | |
2540 | fmt++; | |
2541 | } | |
2542 | } | |
2543 | } | |
1da177e4 | 2544 | |
da99075c JB |
2545 | if (!*fmt) |
2546 | break; | |
2547 | ||
2548 | if (*fmt == 'n') { | |
2549 | /* return number of characters read so far */ | |
2550 | *va_arg(args, int *) = str - buf; | |
2551 | ++fmt; | |
2552 | continue; | |
2553 | } | |
2554 | ||
2555 | if (!*str) | |
1da177e4 LT |
2556 | break; |
2557 | ||
d4be151b | 2558 | base = 10; |
3f623eba | 2559 | is_sign = false; |
d4be151b | 2560 | |
7b9186f5 | 2561 | switch (*fmt++) { |
1da177e4 LT |
2562 | case 'c': |
2563 | { | |
7b9186f5 | 2564 | char *s = (char *)va_arg(args, char*); |
1da177e4 LT |
2565 | if (field_width == -1) |
2566 | field_width = 1; | |
2567 | do { | |
2568 | *s++ = *str++; | |
2569 | } while (--field_width > 0 && *str); | |
2570 | num++; | |
2571 | } | |
2572 | continue; | |
2573 | case 's': | |
2574 | { | |
7b9186f5 AGR |
2575 | char *s = (char *)va_arg(args, char *); |
2576 | if (field_width == -1) | |
4be929be | 2577 | field_width = SHRT_MAX; |
1da177e4 | 2578 | /* first, skip leading white space in buffer */ |
e7d2860b | 2579 | str = skip_spaces(str); |
1da177e4 LT |
2580 | |
2581 | /* now copy until next white space */ | |
7b9186f5 | 2582 | while (*str && !isspace(*str) && field_width--) |
1da177e4 | 2583 | *s++ = *str++; |
1da177e4 LT |
2584 | *s = '\0'; |
2585 | num++; | |
2586 | } | |
2587 | continue; | |
1da177e4 LT |
2588 | case 'o': |
2589 | base = 8; | |
2590 | break; | |
2591 | case 'x': | |
2592 | case 'X': | |
2593 | base = 16; | |
2594 | break; | |
2595 | case 'i': | |
7b9186f5 | 2596 | base = 0; |
1da177e4 | 2597 | case 'd': |
3f623eba | 2598 | is_sign = true; |
1da177e4 LT |
2599 | case 'u': |
2600 | break; | |
2601 | case '%': | |
2602 | /* looking for '%' in str */ | |
7b9186f5 | 2603 | if (*str++ != '%') |
1da177e4 LT |
2604 | return num; |
2605 | continue; | |
2606 | default: | |
2607 | /* invalid format; stop here */ | |
2608 | return num; | |
2609 | } | |
2610 | ||
2611 | /* have some sort of integer conversion. | |
2612 | * first, skip white space in buffer. | |
2613 | */ | |
e7d2860b | 2614 | str = skip_spaces(str); |
1da177e4 LT |
2615 | |
2616 | digit = *str; | |
2617 | if (is_sign && digit == '-') | |
2618 | digit = *(str + 1); | |
2619 | ||
2620 | if (!digit | |
7b9186f5 AGR |
2621 | || (base == 16 && !isxdigit(digit)) |
2622 | || (base == 10 && !isdigit(digit)) | |
2623 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
2624 | || (base == 0 && !isdigit(digit))) | |
2625 | break; | |
1da177e4 | 2626 | |
53809751 JB |
2627 | if (is_sign) |
2628 | val.s = qualifier != 'L' ? | |
2629 | simple_strtol(str, &next, base) : | |
2630 | simple_strtoll(str, &next, base); | |
2631 | else | |
2632 | val.u = qualifier != 'L' ? | |
2633 | simple_strtoul(str, &next, base) : | |
2634 | simple_strtoull(str, &next, base); | |
2635 | ||
2636 | if (field_width > 0 && next - str > field_width) { | |
2637 | if (base == 0) | |
2638 | _parse_integer_fixup_radix(str, &base); | |
2639 | while (next - str > field_width) { | |
2640 | if (is_sign) | |
2641 | val.s = div_s64(val.s, base); | |
2642 | else | |
2643 | val.u = div_u64(val.u, base); | |
2644 | --next; | |
2645 | } | |
2646 | } | |
2647 | ||
7b9186f5 | 2648 | switch (qualifier) { |
1da177e4 | 2649 | case 'H': /* that's 'hh' in format */ |
53809751 JB |
2650 | if (is_sign) |
2651 | *va_arg(args, signed char *) = val.s; | |
2652 | else | |
2653 | *va_arg(args, unsigned char *) = val.u; | |
1da177e4 LT |
2654 | break; |
2655 | case 'h': | |
53809751 JB |
2656 | if (is_sign) |
2657 | *va_arg(args, short *) = val.s; | |
2658 | else | |
2659 | *va_arg(args, unsigned short *) = val.u; | |
1da177e4 LT |
2660 | break; |
2661 | case 'l': | |
53809751 JB |
2662 | if (is_sign) |
2663 | *va_arg(args, long *) = val.s; | |
2664 | else | |
2665 | *va_arg(args, unsigned long *) = val.u; | |
1da177e4 LT |
2666 | break; |
2667 | case 'L': | |
53809751 JB |
2668 | if (is_sign) |
2669 | *va_arg(args, long long *) = val.s; | |
2670 | else | |
2671 | *va_arg(args, unsigned long long *) = val.u; | |
1da177e4 LT |
2672 | break; |
2673 | case 'Z': | |
2674 | case 'z': | |
53809751 JB |
2675 | *va_arg(args, size_t *) = val.u; |
2676 | break; | |
1da177e4 | 2677 | default: |
53809751 JB |
2678 | if (is_sign) |
2679 | *va_arg(args, int *) = val.s; | |
2680 | else | |
2681 | *va_arg(args, unsigned int *) = val.u; | |
1da177e4 LT |
2682 | break; |
2683 | } | |
2684 | num++; | |
2685 | ||
2686 | if (!next) | |
2687 | break; | |
2688 | str = next; | |
2689 | } | |
c6b40d16 | 2690 | |
1da177e4 LT |
2691 | return num; |
2692 | } | |
1da177e4 LT |
2693 | EXPORT_SYMBOL(vsscanf); |
2694 | ||
2695 | /** | |
2696 | * sscanf - Unformat a buffer into a list of arguments | |
2697 | * @buf: input buffer | |
2698 | * @fmt: formatting of buffer | |
2699 | * @...: resulting arguments | |
2700 | */ | |
7b9186f5 | 2701 | int sscanf(const char *buf, const char *fmt, ...) |
1da177e4 LT |
2702 | { |
2703 | va_list args; | |
2704 | int i; | |
2705 | ||
7b9186f5 AGR |
2706 | va_start(args, fmt); |
2707 | i = vsscanf(buf, fmt, args); | |
1da177e4 | 2708 | va_end(args); |
7b9186f5 | 2709 | |
1da177e4 LT |
2710 | return i; |
2711 | } | |
1da177e4 | 2712 | EXPORT_SYMBOL(sscanf); |