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Merge tag 'printk-for-5.2-fixes' of ssh://gitolite.kernel.org/pub/scm/linux/kernel...
[linux-block.git] / lib / vsprintf.c
CommitLineData
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>
ef27ac18 20#include <linux/build_bug.h>
0d1d7a55 21#include <linux/clk.h>
900cca29 22#include <linux/clk-provider.h>
8bc3bcc9 23#include <linux/module.h> /* for KSYM_SYMBOL_LEN */
1da177e4
LT		 24#include <linux/types.h>
25#include <linux/string.h>
26#include <linux/ctype.h>
27#include <linux/kernel.h>
0fe1ef24 28#include <linux/kallsyms.h>
53809751 29#include <linux/math64.h>
0fe1ef24 30#include <linux/uaccess.h>
332d2e78 31#include <linux/ioport.h>
4b6ccca7 32#include <linux/dcache.h>
312b4e22 33#include <linux/cred.h>
4d42c447 34#include <linux/rtc.h>
2b1b0d66 35#include <linux/uuid.h>
ce4fecf1 36#include <linux/of.h>
8a27f7c9 37#include <net/addrconf.h>
ad67b74d
TH		 38#include <linux/siphash.h>
39#include <linux/compiler.h>
1031bc58
DM		 40#ifdef CONFIG_BLOCK
41#include <linux/blkdev.h>
42#endif
1da177e4 43
edf14cdb
VB		 44#include "../mm/internal.h" /* For the trace_print_flags arrays */
45
4e57b681 46#include <asm/page.h> /* for PAGE_SIZE */
7c43d9a3 47#include <asm/byteorder.h> /* cpu_to_le16 */
1da177e4 48
71dca95d 49#include <linux/string_helpers.h>
1dff46d6 50#include "kstrtox.h"
aa46a63e 51
1da177e4 52/**
922ac25c 53 * simple_strtoull - convert a string to an unsigned long long
1da177e4
LT		 54 * @cp: The start of the string
55 * @endp: A pointer to the end of the parsed string will be placed here
56 * @base: The number base to use
462e4711
EZ		 57 *
58 * This function is obsolete. Please use kstrtoull instead.
1da177e4 59 */
922ac25c 60unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
1da177e4 61{
1dff46d6
AD		 62 unsigned long long result;
63 unsigned int rv;
aa46a63e 64
1dff46d6
AD		 65 cp = _parse_integer_fixup_radix(cp, &base);
66 rv = _parse_integer(cp, base, &result);
67 /* FIXME */
68 cp += (rv & ~KSTRTOX_OVERFLOW);
aa46a63e 69
1da177e4
LT		 70 if (endp)
71 *endp = (char *)cp;
7b9186f5 72
1da177e4
LT		 73 return result;
74}
922ac25c 75EXPORT_SYMBOL(simple_strtoull);
1da177e4
LT		 76
77/**
922ac25c 78 * simple_strtoul - convert a string to an unsigned long
1da177e4
LT		 79 * @cp: The start of the string
80 * @endp: A pointer to the end of the parsed string will be placed here
81 * @base: The number base to use
462e4711
EZ		 82 *
83 * This function is obsolete. Please use kstrtoul instead.
1da177e4 84 */
922ac25c 85unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
1da177e4 86{
922ac25c 87 return simple_strtoull(cp, endp, base);
1da177e4 88}
922ac25c 89EXPORT_SYMBOL(simple_strtoul);
1da177e4
LT		 90
91/**
922ac25c 92 * simple_strtol - convert a string to a signed long
1da177e4
LT		 93 * @cp: The start of the string
94 * @endp: A pointer to the end of the parsed string will be placed here
95 * @base: The number base to use
462e4711
EZ		 96 *
97 * This function is obsolete. Please use kstrtol instead.
1da177e4 98 */
922ac25c 99long simple_strtol(const char *cp, char **endp, unsigned int base)
1da177e4 100{
922ac25c
AGR		 101 if (*cp == '-')
102 return -simple_strtoul(cp + 1, endp, base);
7b9186f5 103
922ac25c 104 return simple_strtoul(cp, endp, base);
1da177e4 105}
922ac25c 106EXPORT_SYMBOL(simple_strtol);
1da177e4
LT		 107
108/**
109 * simple_strtoll - convert a string to a signed long long
110 * @cp: The start of the string
111 * @endp: A pointer to the end of the parsed string will be placed here
112 * @base: The number base to use
462e4711
EZ		 113 *
114 * This function is obsolete. Please use kstrtoll instead.
1da177e4 115 */
22d27051 116long long simple_strtoll(const char *cp, char **endp, unsigned int base)
1da177e4 117{
7b9186f5 118 if (*cp == '-')
22d27051 119 return -simple_strtoull(cp + 1, endp, base);
7b9186f5 120
22d27051 121 return simple_strtoull(cp, endp, base);
1da177e4 122}
98d5ce0d 123EXPORT_SYMBOL(simple_strtoll);
1da177e4 124
cf3b429b
JP		 125static noinline_for_stack
126int skip_atoi(const char **s)
1da177e4 127{
7b9186f5 128 int i = 0;
1da177e4 129
43e5b666 130 do {
1da177e4 131 i = i*10 + *((*s)++) - '0';
43e5b666 132 } while (isdigit(**s));
7b9186f5 133
1da177e4
LT		 134 return i;
135}
136
7c43d9a3
RV		 137/*
138 * Decimal conversion is by far the most typical, and is used for
139 * /proc and /sys data. This directly impacts e.g. top performance
140 * with many processes running. We optimize it for speed by emitting
141 * two characters at a time, using a 200 byte lookup table. This
142 * roughly halves the number of multiplications compared to computing
143 * the digits one at a time. Implementation strongly inspired by the
144 * previous version, which in turn used ideas described at
145 * <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission
146 * from the author, Douglas W. Jones).
147 *
148 * It turns out there is precisely one 26 bit fixed-point
149 * approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32
150 * holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual
151 * range happens to be somewhat larger (x <= 1073741898), but that's
152 * irrelevant for our purpose.
153 *
154 * For dividing a number in the range [10^4, 10^6-1] by 100, we still
155 * need a 32x32->64 bit multiply, so we simply use the same constant.
156 *
157 * For dividing a number in the range [100, 10^4-1] by 100, there are
158 * several options. The simplest is (x * 0x147b) >> 19, which is valid
159 * for all x <= 43698.
133fd9f5 160 */
4277eedd 161
7c43d9a3
RV		 162static const u16 decpair[100] = {
163#define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030)
164 _( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9),
165 _(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19),
166 _(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29),
167 _(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39),
168 _(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49),
169 _(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59),
170 _(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69),
171 _(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79),
172 _(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89),
173 _(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99),
174#undef _
175};
176
177/*
178 * This will print a single '0' even if r == 0, since we would
675cf53c
RV		 179 * immediately jump to out_r where two 0s would be written but only
180 * one of them accounted for in buf. This is needed by ip4_string
181 * below. All other callers pass a non-zero value of r.
7c43d9a3 182*/
cf3b429b 183static noinline_for_stack
7c43d9a3 184char *put_dec_trunc8(char *buf, unsigned r)
4277eedd 185{
7c43d9a3
RV		 186 unsigned q;
187
188 /* 1 <= r < 10^8 */
189 if (r < 100)
190 goto out_r;
191
192 /* 100 <= r < 10^8 */
193 q = (r * (u64)0x28f5c29) >> 32;
194 *((u16 *)buf) = decpair[r - 100*q];
195 buf += 2;
196
197 /* 1 <= q < 10^6 */
198 if (q < 100)
199 goto out_q;
200
201 /* 100 <= q < 10^6 */
202 r = (q * (u64)0x28f5c29) >> 32;
203 *((u16 *)buf) = decpair[q - 100*r];
204 buf += 2;
205
206 /* 1 <= r < 10^4 */
207 if (r < 100)
208 goto out_r;
209
210 /* 100 <= r < 10^4 */
211 q = (r * 0x147b) >> 19;
212 *((u16 *)buf) = decpair[r - 100*q];
213 buf += 2;
214out_q:
215 /* 1 <= q < 100 */
216 r = q;
217out_r:
218 /* 1 <= r < 100 */
219 *((u16 *)buf) = decpair[r];
675cf53c 220 buf += r < 10 ? 1 : 2;
4277eedd
DV		 221 return buf;
222}
133fd9f5 223
7c43d9a3 224#if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64
cf3b429b 225static noinline_for_stack
7c43d9a3 226char *put_dec_full8(char *buf, unsigned r)
4277eedd 227{
133fd9f5
DV		 228 unsigned q;
229
7c43d9a3
RV		 230 /* 0 <= r < 10^8 */
231 q = (r * (u64)0x28f5c29) >> 32;
232 *((u16 *)buf) = decpair[r - 100*q];
233 buf += 2;
4277eedd 234
7c43d9a3
RV		 235 /* 0 <= q < 10^6 */
236 r = (q * (u64)0x28f5c29) >> 32;
237 *((u16 *)buf) = decpair[q - 100*r];
238 buf += 2;
7b9186f5 239
7c43d9a3
RV		 240 /* 0 <= r < 10^4 */
241 q = (r * 0x147b) >> 19;
242 *((u16 *)buf) = decpair[r - 100*q];
243 buf += 2;
133fd9f5 244
7c43d9a3
RV		 245 /* 0 <= q < 100 */
246 *((u16 *)buf) = decpair[q];
247 buf += 2;
248 return buf;
249}
133fd9f5 250
7c43d9a3 251static noinline_for_stack
133fd9f5
DV		 252char *put_dec(char *buf, unsigned long long n)
253{
7c43d9a3
RV		 254 if (n >= 100*1000*1000)
255 buf = put_dec_full8(buf, do_div(n, 100*1000*1000));
256 /* 1 <= n <= 1.6e11 */
257 if (n >= 100*1000*1000)
258 buf = put_dec_full8(buf, do_div(n, 100*1000*1000));
259 /* 1 <= n < 1e8 */
133fd9f5 260 return put_dec_trunc8(buf, n);
4277eedd 261}
133fd9f5 262
7c43d9a3 263#elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64
133fd9f5 264
7c43d9a3
RV		 265static void
266put_dec_full4(char *buf, unsigned r)
4277eedd 267{
7c43d9a3
RV		 268 unsigned q;
269
270 /* 0 <= r < 10^4 */
271 q = (r * 0x147b) >> 19;
272 *((u16 *)buf) = decpair[r - 100*q];
273 buf += 2;
274 /* 0 <= q < 100 */
275 *((u16 *)buf) = decpair[q];
2359172a
GS		 276}
277
278/*
279 * Call put_dec_full4 on x % 10000, return x / 10000.
280 * The approximation x/10000 == (x * 0x346DC5D7) >> 43
281 * holds for all x < 1,128,869,999. The largest value this
282 * helper will ever be asked to convert is 1,125,520,955.
7c43d9a3 283 * (second call in the put_dec code, assuming n is all-ones).
2359172a 284 */
7c43d9a3 285static noinline_for_stack
2359172a
GS		 286unsigned put_dec_helper4(char *buf, unsigned x)
287{
288 uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43;
289
290 put_dec_full4(buf, x - q * 10000);
291 return q;
4277eedd
DV		 292}
293
133fd9f5
DV		 294/* Based on code by Douglas W. Jones found at
295 * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour>
296 * (with permission from the author).
297 * Performs no 64-bit division and hence should be fast on 32-bit machines.
298 */
299static
300char *put_dec(char *buf, unsigned long long n)
301{
302 uint32_t d3, d2, d1, q, h;
303
304 if (n < 100*1000*1000)
305 return put_dec_trunc8(buf, n);
306
307 d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */
308 h = (n >> 32);
309 d2 = (h ) & 0xffff;
310 d3 = (h >> 16); /* implicit "& 0xffff" */
311
7c43d9a3
RV		 312 /* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0
313 = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */
133fd9f5 314 q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff);
2359172a
GS		 315 q = put_dec_helper4(buf, q);
316
317 q += 7671 * d3 + 9496 * d2 + 6 * d1;
318 q = put_dec_helper4(buf+4, q);
319
320 q += 4749 * d3 + 42 * d2;
321 q = put_dec_helper4(buf+8, q);
133fd9f5 322
2359172a
GS		 323 q += 281 * d3;
324 buf += 12;
325 if (q)
326 buf = put_dec_trunc8(buf, q);
327 else while (buf[-1] == '0')
133fd9f5
DV		 328 --buf;
329
330 return buf;
331}
332
333#endif
334
1ac101a5
KH		 335/*
336 * Convert passed number to decimal string.
337 * Returns the length of string. On buffer overflow, returns 0.
338 *
339 * If speed is not important, use snprintf(). It's easy to read the code.
340 */
d1be35cb 341int num_to_str(char *buf, int size, unsigned long long num, unsigned int width)
1ac101a5 342{
7c43d9a3
RV		 343 /* put_dec requires 2-byte alignment of the buffer. */
344 char tmp[sizeof(num) * 3] __aligned(2);
1ac101a5
KH		 345 int idx, len;
346
133fd9f5
DV		 347 /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */
348 if (num <= 9) {
349 tmp[0] = '0' + num;
350 len = 1;
351 } else {
352 len = put_dec(tmp, num) - tmp;
353 }
1ac101a5 354
d1be35cb 355 if (len > size || width > size)
1ac101a5 356 return 0;
d1be35cb
AV		 357
358 if (width > len) {
359 width = width - len;
360 for (idx = 0; idx < width; idx++)
361 buf[idx] = ' ';
362 } else {
363 width = 0;
364 }
365
1ac101a5 366 for (idx = 0; idx < len; ++idx)
d1be35cb
AV		 367 buf[idx + width] = tmp[len - idx - 1];
368
369 return len + width;
1ac101a5
KH		 370}
371
51be17df 372#define SIGN 1 /* unsigned/signed, must be 1 */
d1c1b121 373#define LEFT 2 /* left justified */
1da177e4
LT		 374#define PLUS 4 /* show plus */
375#define SPACE 8 /* space if plus */
d1c1b121 376#define ZEROPAD 16 /* pad with zero, must be 16 == '0' - ' ' */
b89dc5d6
BH		 377#define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
378#define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
1da177e4 379
fef20d9c
FW		 380enum format_type {
381 FORMAT_TYPE_NONE, /* Just a string part */
ed681a91 382 FORMAT_TYPE_WIDTH,
fef20d9c
FW		 383 FORMAT_TYPE_PRECISION,
384 FORMAT_TYPE_CHAR,
385 FORMAT_TYPE_STR,
386 FORMAT_TYPE_PTR,
387 FORMAT_TYPE_PERCENT_CHAR,
388 FORMAT_TYPE_INVALID,
389 FORMAT_TYPE_LONG_LONG,
390 FORMAT_TYPE_ULONG,
391 FORMAT_TYPE_LONG,
a4e94ef0
Z		 392 FORMAT_TYPE_UBYTE,
393 FORMAT_TYPE_BYTE,
fef20d9c
FW		 394 FORMAT_TYPE_USHORT,
395 FORMAT_TYPE_SHORT,
396 FORMAT_TYPE_UINT,
397 FORMAT_TYPE_INT,
fef20d9c
FW		 398 FORMAT_TYPE_SIZE_T,
399 FORMAT_TYPE_PTRDIFF
400};
401
402struct printf_spec {
d0484193
RV		 403 unsigned int type:8; /* format_type enum */
404 signed int field_width:24; /* width of output field */
405 unsigned int flags:8; /* flags to number() */
406 unsigned int base:8; /* number base, 8, 10 or 16 only */
407 signed int precision:16; /* # of digits/chars */
408} __packed;
ef27ac18
RV		 409static_assert(sizeof(struct printf_spec) == 8);
410
4d72ba01
RV		 411#define FIELD_WIDTH_MAX ((1 << 23) - 1)
412#define PRECISION_MAX ((1 << 15) - 1)
fef20d9c 413
cf3b429b
JP		 414static noinline_for_stack
415char *number(char *buf, char *end, unsigned long long num,
416 struct printf_spec spec)
1da177e4 417{
7c43d9a3
RV		 418 /* put_dec requires 2-byte alignment of the buffer. */
419 char tmp[3 * sizeof(num)] __aligned(2);
9b706aee
DV		 420 char sign;
421 char locase;
fef20d9c 422 int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
1da177e4 423 int i;
7c203422 424 bool is_zero = num == 0LL;
1c7a8e62
RV		 425 int field_width = spec.field_width;
426 int precision = spec.precision;
1da177e4 427
9b706aee
DV		 428 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
429 * produces same digits or (maybe lowercased) letters */
fef20d9c
FW		 430 locase = (spec.flags & SMALL);
431 if (spec.flags & LEFT)
432 spec.flags &= ~ZEROPAD;
1da177e4 433 sign = 0;
fef20d9c 434 if (spec.flags & SIGN) {
7b9186f5 435 if ((signed long long)num < 0) {
1da177e4 436 sign = '-';
7b9186f5 437 num = -(signed long long)num;
1c7a8e62 438 field_width--;
fef20d9c 439 } else if (spec.flags & PLUS) {
1da177e4 440 sign = '+';
1c7a8e62 441 field_width--;
fef20d9c 442 } else if (spec.flags & SPACE) {
1da177e4 443 sign = ' ';
1c7a8e62 444 field_width--;
1da177e4
LT		 445 }
446 }
b39a7340 447 if (need_pfx) {
fef20d9c 448 if (spec.base == 16)
1c7a8e62 449 field_width -= 2;
7c203422 450 else if (!is_zero)
1c7a8e62 451 field_width--;
1da177e4 452 }
b39a7340
DV		 453
454 /* generate full string in tmp[], in reverse order */
1da177e4 455 i = 0;
133fd9f5 456 if (num < spec.base)
3ea8d440 457 tmp[i++] = hex_asc_upper[num] | locase;
fef20d9c
FW		 458 else if (spec.base != 10) { /* 8 or 16 */
459 int mask = spec.base - 1;
b39a7340 460 int shift = 3;
7b9186f5
AGR		 461
462 if (spec.base == 16)
463 shift = 4;
b39a7340 464 do {
3ea8d440 465 tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase);
b39a7340
DV		 466 num >>= shift;
467 } while (num);
4277eedd
DV		 468 } else { /* base 10 */
469 i = put_dec(tmp, num) - tmp;
470 }
b39a7340
DV		 471
472 /* printing 100 using %2d gives "100", not "00" */
1c7a8e62
RV		 473 if (i > precision)
474 precision = i;
b39a7340 475 /* leading space padding */
1c7a8e62 476 field_width -= precision;
51be17df 477 if (!(spec.flags & (ZEROPAD | LEFT))) {
1c7a8e62 478 while (--field_width >= 0) {
f796937a 479 if (buf < end)
1da177e4
LT		 480 *buf = ' ';
481 ++buf;
482 }
483 }
b39a7340 484 /* sign */
1da177e4 485 if (sign) {
f796937a 486 if (buf < end)
1da177e4
LT		 487 *buf = sign;
488 ++buf;
489 }
b39a7340
DV		 490 /* "0x" / "0" prefix */
491 if (need_pfx) {
7c203422
PC		 492 if (spec.base == 16 || !is_zero) {
493 if (buf < end)
494 *buf = '0';
495 ++buf;
496 }
fef20d9c 497 if (spec.base == 16) {
f796937a 498 if (buf < end)
9b706aee 499 *buf = ('X' | locase);
1da177e4
LT		 500 ++buf;
501 }
502 }
b39a7340 503 /* zero or space padding */
fef20d9c 504 if (!(spec.flags & LEFT)) {
d1c1b121
RV		 505 char c = ' ' + (spec.flags & ZEROPAD);
506 BUILD_BUG_ON(' ' + ZEROPAD != '0');
1c7a8e62 507 while (--field_width >= 0) {
f796937a 508 if (buf < end)
1da177e4
LT		 509 *buf = c;
510 ++buf;
511 }
512 }
b39a7340 513 /* hmm even more zero padding? */
1c7a8e62 514 while (i <= --precision) {
f796937a 515 if (buf < end)
1da177e4
LT		 516 *buf = '0';
517 ++buf;
518 }
b39a7340
DV		 519 /* actual digits of result */
520 while (--i >= 0) {
f796937a 521 if (buf < end)
1da177e4
LT		 522 *buf = tmp[i];
523 ++buf;
524 }
b39a7340 525 /* trailing space padding */
1c7a8e62 526 while (--field_width >= 0) {
f796937a 527 if (buf < end)
1da177e4
LT		 528 *buf = ' ';
529 ++buf;
530 }
7b9186f5 531
1da177e4
LT		 532 return buf;
533}
534
3cab1e71
AS		 535static noinline_for_stack
536char *special_hex_number(char *buf, char *end, unsigned long long num, int size)
537{
538 struct printf_spec spec;
539
540 spec.type = FORMAT_TYPE_PTR;
541 spec.field_width = 2 + 2 * size; /* 0x + hex */
542 spec.flags = SPECIAL | SMALL | ZEROPAD;
543 spec.base = 16;
544 spec.precision = -1;
545
546 return number(buf, end, num, spec);
547}
548
cfccde04 549static void move_right(char *buf, char *end, unsigned len, unsigned spaces)
4b6ccca7
AV		 550{
551 size_t size;
552 if (buf >= end) /* nowhere to put anything */
553 return;
554 size = end - buf;
555 if (size <= spaces) {
556 memset(buf, ' ', size);
557 return;
558 }
559 if (len) {
560 if (len > size - spaces)
561 len = size - spaces;
562 memmove(buf + spaces, buf, len);
563 }
564 memset(buf, ' ', spaces);
565}
566
cfccde04
RV		 567/*
568 * Handle field width padding for a string.
569 * @buf: current buffer position
570 * @n: length of string
571 * @end: end of output buffer
572 * @spec: for field width and flags
573 * Returns: new buffer position after padding.
574 */
575static noinline_for_stack
576char *widen_string(char *buf, int n, char *end, struct printf_spec spec)
577{
578 unsigned spaces;
579
580 if (likely(n >= spec.field_width))
581 return buf;
582 /* we want to pad the sucker */
583 spaces = spec.field_width - n;
584 if (!(spec.flags & LEFT)) {
585 move_right(buf - n, end, n, spaces);
586 return buf + spaces;
587 }
588 while (spaces--) {
589 if (buf < end)
590 *buf = ' ';
591 ++buf;
592 }
593 return buf;
594}
595
d529ac41
PM		 596/* Handle string from a well known address. */
597static char *string_nocheck(char *buf, char *end, const char *s,
598 struct printf_spec spec)
95508cfa 599{
34fc8b90
RV		 600 int len = 0;
601 size_t lim = spec.precision;
95508cfa 602
34fc8b90
RV		 603 while (lim--) {
604 char c = *s++;
605 if (!c)
606 break;
95508cfa 607 if (buf < end)
34fc8b90 608 *buf = c;
95508cfa 609 ++buf;
34fc8b90 610 ++len;
95508cfa 611 }
34fc8b90 612 return widen_string(buf, len, end, spec);
95508cfa
RV		 613}
614
c8c3b584
PM		 615/* Be careful: error messages must fit into the given buffer. */
616static char *error_string(char *buf, char *end, const char *s,
617 struct printf_spec spec)
618{
619 /*
620 * Hard limit to avoid a completely insane messages. It actually
621 * works pretty well because most error messages are in
622 * the many pointer format modifiers.
623 */
624 if (spec.precision == -1)
625 spec.precision = 2 * sizeof(void *);
626
627 return string_nocheck(buf, end, s, spec);
628}
629
3e5903eb 630/*
2ac5a3bf
PM		 631 * Do not call any complex external code here. Nested printk()/vsprintf()
632 * might cause infinite loops. Failures might break printk() and would
633 * be hard to debug.
3e5903eb
PM		 634 */
635static const char *check_pointer_msg(const void *ptr)
636{
3e5903eb
PM		 637 if (!ptr)
638 return "(null)";
639
2ac5a3bf 640 if ((unsigned long)ptr < PAGE_SIZE || IS_ERR_VALUE(ptr))
3e5903eb
PM		 641 return "(efault)";
642
643 return NULL;
644}
645
646static int check_pointer(char **buf, char *end, const void *ptr,
647 struct printf_spec spec)
648{
649 const char *err_msg;
650
651 err_msg = check_pointer_msg(ptr);
652 if (err_msg) {
c8c3b584 653 *buf = error_string(*buf, end, err_msg, spec);
3e5903eb
PM		 654 return -EFAULT;
655 }
656
657 return 0;
658}
659
9073dac1 660static noinline_for_stack
d529ac41
PM		 661char *string(char *buf, char *end, const char *s,
662 struct printf_spec spec)
663{
3e5903eb
PM		 664 if (check_pointer(&buf, end, s, spec))
665 return buf;
d529ac41
PM		 666
667 return string_nocheck(buf, end, s, spec);
668}
669
ce9d3ece
Y		 670static char *pointer_string(char *buf, char *end,
671 const void *ptr,
672 struct printf_spec spec)
9073dac1
GU		 673{
674 spec.base = 16;
675 spec.flags |= SMALL;
676 if (spec.field_width == -1) {
677 spec.field_width = 2 * sizeof(ptr);
678 spec.flags |= ZEROPAD;
679 }
680
681 return number(buf, end, (unsigned long int)ptr, spec);
682}
683
684/* Make pointers available for printing early in the boot sequence. */
685static int debug_boot_weak_hash __ro_after_init;
686
687static int __init debug_boot_weak_hash_enable(char *str)
688{
689 debug_boot_weak_hash = 1;
690 pr_info("debug_boot_weak_hash enabled\n");
691 return 0;
692}
693early_param("debug_boot_weak_hash", debug_boot_weak_hash_enable);
694
695static DEFINE_STATIC_KEY_TRUE(not_filled_random_ptr_key);
696static siphash_key_t ptr_key __read_mostly;
697
698static void enable_ptr_key_workfn(struct work_struct *work)
699{
700 get_random_bytes(&ptr_key, sizeof(ptr_key));
701 /* Needs to run from preemptible context */
702 static_branch_disable(&not_filled_random_ptr_key);
703}
704
705static DECLARE_WORK(enable_ptr_key_work, enable_ptr_key_workfn);
706
707static void fill_random_ptr_key(struct random_ready_callback *unused)
708{
709 /* This may be in an interrupt handler. */
710 queue_work(system_unbound_wq, &enable_ptr_key_work);
711}
712
713static struct random_ready_callback random_ready = {
714 .func = fill_random_ptr_key
715};
716
717static int __init initialize_ptr_random(void)
718{
719 int key_size = sizeof(ptr_key);
720 int ret;
721
722 /* Use hw RNG if available. */
723 if (get_random_bytes_arch(&ptr_key, key_size) == key_size) {
724 static_branch_disable(&not_filled_random_ptr_key);
725 return 0;
726 }
727
728 ret = add_random_ready_callback(&random_ready);
729 if (!ret) {
730 return 0;
731 } else if (ret == -EALREADY) {
732 /* This is in preemptible context */
733 enable_ptr_key_workfn(&enable_ptr_key_work);
734 return 0;
735 }
736
737 return ret;
738}
739early_initcall(initialize_ptr_random);
740
741/* Maps a pointer to a 32 bit unique identifier. */
742static char *ptr_to_id(char *buf, char *end, const void *ptr,
743 struct printf_spec spec)
744{
745 const char *str = sizeof(ptr) == 8 ? "(____ptrval____)" : "(ptrval)";
746 unsigned long hashval;
747
748 /* When debugging early boot use non-cryptographically secure hash. */
749 if (unlikely(debug_boot_weak_hash)) {
750 hashval = hash_long((unsigned long)ptr, 32);
751 return pointer_string(buf, end, (const void *)hashval, spec);
752 }
753
754 if (static_branch_unlikely(&not_filled_random_ptr_key)) {
755 spec.field_width = 2 * sizeof(ptr);
756 /* string length must be less than default_width */
c8c3b584 757 return error_string(buf, end, str, spec);
9073dac1
GU		 758 }
759
760#ifdef CONFIG_64BIT
761 hashval = (unsigned long)siphash_1u64((u64)ptr, &ptr_key);
762 /*
763 * Mask off the first 32 bits, this makes explicit that we have
764 * modified the address (and 32 bits is plenty for a unique ID).
765 */
766 hashval = hashval & 0xffffffff;
767#else
768 hashval = (unsigned long)siphash_1u32((u32)ptr, &ptr_key);
769#endif
770 return pointer_string(buf, end, (const void *)hashval, spec);
771}
772
6eea242f
PM		 773int kptr_restrict __read_mostly;
774
775static noinline_for_stack
776char *restricted_pointer(char *buf, char *end, const void *ptr,
777 struct printf_spec spec)
778{
779 switch (kptr_restrict) {
780 case 0:
1ac2f978
PM		 781 /* Handle as %p, hash and do _not_ leak addresses. */
782 return ptr_to_id(buf, end, ptr, spec);
6eea242f
PM		 783 case 1: {
784 const struct cred *cred;
785
786 /*
787 * kptr_restrict==1 cannot be used in IRQ context
788 * because its test for CAP_SYSLOG would be meaningless.
789 */
790 if (in_irq() || in_serving_softirq() || in_nmi()) {
791 if (spec.field_width == -1)
792 spec.field_width = 2 * sizeof(ptr);
c8c3b584 793 return error_string(buf, end, "pK-error", spec);
6eea242f
PM		 794 }
795
796 /*
797 * Only print the real pointer value if the current
798 * process has CAP_SYSLOG and is running with the
799 * same credentials it started with. This is because
800 * access to files is checked at open() time, but %pK
801 * checks permission at read() time. We don't want to
802 * leak pointer values if a binary opens a file using
803 * %pK and then elevates privileges before reading it.
804 */
805 cred = current_cred();
806 if (!has_capability_noaudit(current, CAP_SYSLOG) ||
807 !uid_eq(cred->euid, cred->uid) ||
808 !gid_eq(cred->egid, cred->gid))
809 ptr = NULL;
810 break;
811 }
812 case 2:
813 default:
814 /* Always print 0's for %pK */
815 ptr = NULL;
816 break;
817 }
818
819 return pointer_string(buf, end, ptr, spec);
820}
821
4b6ccca7
AV		 822static noinline_for_stack
823char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec,
824 const char *fmt)
825{
826 const char *array[4], *s;
827 const struct dentry *p;
828 int depth;
829 int i, n;
830
831 switch (fmt[1]) {
832 case '2': case '3': case '4':
833 depth = fmt[1] - '0';
834 break;
835 default:
836 depth = 1;
837 }
838
839 rcu_read_lock();
840 for (i = 0; i < depth; i++, d = p) {
3e5903eb
PM		 841 if (check_pointer(&buf, end, d, spec)) {
842 rcu_read_unlock();
843 return buf;
844 }
845
6aa7de05
MR		 846 p = READ_ONCE(d->d_parent);
847 array[i] = READ_ONCE(d->d_name.name);
4b6ccca7
AV		 848 if (p == d) {
849 if (i)
850 array[i] = "";
851 i++;
852 break;
853 }
854 }
855 s = array[--i];
856 for (n = 0; n != spec.precision; n++, buf++) {
857 char c = *s++;
858 if (!c) {
859 if (!i)
860 break;
861 c = '/';
862 s = array[--i];
863 }
864 if (buf < end)
865 *buf = c;
866 }
867 rcu_read_unlock();
cfccde04 868 return widen_string(buf, n, end, spec);
4b6ccca7
AV		 869}
870
1031bc58
DM		 871#ifdef CONFIG_BLOCK
872static noinline_for_stack
873char *bdev_name(char *buf, char *end, struct block_device *bdev,
874 struct printf_spec spec, const char *fmt)
875{
3e5903eb
PM		 876 struct gendisk *hd;
877
878 if (check_pointer(&buf, end, bdev, spec))
879 return buf;
880
881 hd = bdev->bd_disk;
1031bc58
DM		 882 buf = string(buf, end, hd->disk_name, spec);
883 if (bdev->bd_part->partno) {
884 if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) {
885 if (buf < end)
886 *buf = 'p';
887 buf++;
888 }
889 buf = number(buf, end, bdev->bd_part->partno, spec);
890 }
891 return buf;
892}
893#endif
894
cf3b429b
JP		 895static noinline_for_stack
896char *symbol_string(char *buf, char *end, void *ptr,
b0d33c2b 897 struct printf_spec spec, const char *fmt)
0fe1ef24 898{
b0d33c2b 899 unsigned long value;
0fe1ef24
LT		 900#ifdef CONFIG_KALLSYMS
901 char sym[KSYM_SYMBOL_LEN];
b0d33c2b
JP		 902#endif
903
904 if (fmt[1] == 'R')
905 ptr = __builtin_extract_return_addr(ptr);
906 value = (unsigned long)ptr;
907
908#ifdef CONFIG_KALLSYMS
909 if (*fmt == 'B')
0f77a8d3 910 sprint_backtrace(sym, value);
b0d33c2b 911 else if (*fmt != 'f' && *fmt != 's')
0c8b946e
FW		 912 sprint_symbol(sym, value);
913 else
4796dd20 914 sprint_symbol_no_offset(sym, value);
7b9186f5 915
d529ac41 916 return string_nocheck(buf, end, sym, spec);
0fe1ef24 917#else
3cab1e71 918 return special_hex_number(buf, end, value, sizeof(void *));
0fe1ef24
LT		 919#endif
920}
921
abd4fe62
AS		 922static const struct printf_spec default_str_spec = {
923 .field_width = -1,
924 .precision = -1,
925};
926
54433973
AS		 927static const struct printf_spec default_flag_spec = {
928 .base = 16,
929 .precision = -1,
930 .flags = SPECIAL | SMALL,
931};
932
ce0b4910
AS		 933static const struct printf_spec default_dec_spec = {
934 .base = 10,
935 .precision = -1,
936};
937
4d42c447
AS		 938static const struct printf_spec default_dec02_spec = {
939 .base = 10,
940 .field_width = 2,
941 .precision = -1,
942 .flags = ZEROPAD,
943};
944
945static const struct printf_spec default_dec04_spec = {
946 .base = 10,
947 .field_width = 4,
948 .precision = -1,
949 .flags = ZEROPAD,
950};
951
cf3b429b
JP		 952static noinline_for_stack
953char *resource_string(char *buf, char *end, struct resource *res,
954 struct printf_spec spec, const char *fmt)
332d2e78
LT		 955{
956#ifndef IO_RSRC_PRINTK_SIZE
28405372 957#define IO_RSRC_PRINTK_SIZE 6
332d2e78
LT		 958#endif
959
960#ifndef MEM_RSRC_PRINTK_SIZE
28405372 961#define MEM_RSRC_PRINTK_SIZE 10
332d2e78 962#endif
4da0b66c 963 static const struct printf_spec io_spec = {
fef20d9c 964 .base = 16,
4da0b66c 965 .field_width = IO_RSRC_PRINTK_SIZE,
fef20d9c
FW		 966 .precision = -1,
967 .flags = SPECIAL | SMALL | ZEROPAD,
968 };
4da0b66c
BH		 969 static const struct printf_spec mem_spec = {
970 .base = 16,
971 .field_width = MEM_RSRC_PRINTK_SIZE,
972 .precision = -1,
973 .flags = SPECIAL | SMALL | ZEROPAD,
974 };
0f4050c7
BH		 975 static const struct printf_spec bus_spec = {
976 .base = 16,
977 .field_width = 2,
978 .precision = -1,
979 .flags = SMALL | ZEROPAD,
980 };
4da0b66c 981 static const struct printf_spec str_spec = {
fd95541e
BH		 982 .field_width = -1,
983 .precision = 10,
984 .flags = LEFT,
985 };
c7dabef8
BH		 986
987 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
988 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
989#define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
990#define FLAG_BUF_SIZE (2 * sizeof(res->flags))
9d7cca04 991#define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
c7dabef8
BH		 992#define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
993 char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
994 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
995
332d2e78 996 char *p = sym, *pend = sym + sizeof(sym);
c7dabef8 997 int decode = (fmt[0] == 'R') ? 1 : 0;
4da0b66c 998 const struct printf_spec *specp;
332d2e78 999
3e5903eb
PM		 1000 if (check_pointer(&buf, end, res, spec))
1001 return buf;
1002
332d2e78 1003 *p++ = '[';
4da0b66c 1004 if (res->flags & IORESOURCE_IO) {
d529ac41 1005 p = string_nocheck(p, pend, "io ", str_spec);
4da0b66c
BH		 1006 specp = &io_spec;
1007 } else if (res->flags & IORESOURCE_MEM) {
d529ac41 1008 p = string_nocheck(p, pend, "mem ", str_spec);
4da0b66c
BH		 1009 specp = &mem_spec;
1010 } else if (res->flags & IORESOURCE_IRQ) {
d529ac41 1011 p = string_nocheck(p, pend, "irq ", str_spec);
ce0b4910 1012 specp = &default_dec_spec;
4da0b66c 1013 } else if (res->flags & IORESOURCE_DMA) {
d529ac41 1014 p = string_nocheck(p, pend, "dma ", str_spec);
ce0b4910 1015 specp = &default_dec_spec;
0f4050c7 1016 } else if (res->flags & IORESOURCE_BUS) {
d529ac41 1017 p = string_nocheck(p, pend, "bus ", str_spec);
0f4050c7 1018 specp = &bus_spec;
4da0b66c 1019 } else {
d529ac41 1020 p = string_nocheck(p, pend, "??? ", str_spec);
4da0b66c 1021 specp = &mem_spec;
c7dabef8 1022 decode = 0;
fd95541e 1023 }
d19cb803 1024 if (decode && res->flags & IORESOURCE_UNSET) {
d529ac41 1025 p = string_nocheck(p, pend, "size ", str_spec);
d19cb803
BH		 1026 p = number(p, pend, resource_size(res), *specp);
1027 } else {
1028 p = number(p, pend, res->start, *specp);
1029 if (res->start != res->end) {
1030 *p++ = '-';
1031 p = number(p, pend, res->end, *specp);
1032 }
c91d3376 1033 }
c7dabef8 1034 if (decode) {
fd95541e 1035 if (res->flags & IORESOURCE_MEM_64)
d529ac41 1036 p = string_nocheck(p, pend, " 64bit", str_spec);
fd95541e 1037 if (res->flags & IORESOURCE_PREFETCH)
d529ac41 1038 p = string_nocheck(p, pend, " pref", str_spec);
9d7cca04 1039 if (res->flags & IORESOURCE_WINDOW)
d529ac41 1040 p = string_nocheck(p, pend, " window", str_spec);
fd95541e 1041 if (res->flags & IORESOURCE_DISABLED)
d529ac41 1042 p = string_nocheck(p, pend, " disabled", str_spec);
c7dabef8 1043 } else {
d529ac41 1044 p = string_nocheck(p, pend, " flags ", str_spec);
54433973 1045 p = number(p, pend, res->flags, default_flag_spec);
fd95541e 1046 }
332d2e78 1047 *p++ = ']';
c7dabef8 1048 *p = '\0';
332d2e78 1049
d529ac41 1050 return string_nocheck(buf, end, sym, spec);
332d2e78
LT		 1051}
1052
31550a16
AS		 1053static noinline_for_stack
1054char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
1055 const char *fmt)
1056{
360603a1 1057 int i, len = 1; /* if we pass '%ph[CDN]', field width remains
31550a16
AS		 1058 negative value, fallback to the default */
1059 char separator;
1060
1061 if (spec.field_width == 0)
1062 /* nothing to print */
1063 return buf;
1064
3e5903eb
PM		 1065 if (check_pointer(&buf, end, addr, spec))
1066 return buf;
31550a16
AS		 1067
1068 switch (fmt[1]) {
1069 case 'C':
1070 separator = ':';
1071 break;
1072 case 'D':
1073 separator = '-';
1074 break;
1075 case 'N':
1076 separator = 0;
1077 break;
1078 default:
1079 separator = ' ';
1080 break;
1081 }
1082
1083 if (spec.field_width > 0)
1084 len = min_t(int, spec.field_width, 64);
1085
9c98f235
RV		 1086 for (i = 0; i < len; ++i) {
1087 if (buf < end)
1088 *buf = hex_asc_hi(addr[i]);
1089 ++buf;
1090 if (buf < end)
1091 *buf = hex_asc_lo(addr[i]);
1092 ++buf;
31550a16 1093
9c98f235
RV		 1094 if (separator && i != len - 1) {
1095 if (buf < end)
1096 *buf = separator;
1097 ++buf;
1098 }
31550a16
AS		 1099 }
1100
1101 return buf;
1102}
1103
dbc760bc
TH		 1104static noinline_for_stack
1105char *bitmap_string(char *buf, char *end, unsigned long *bitmap,
1106 struct printf_spec spec, const char *fmt)
1107{
1108 const int CHUNKSZ = 32;
1109 int nr_bits = max_t(int, spec.field_width, 0);
1110 int i, chunksz;
1111 bool first = true;
1112
3e5903eb
PM		 1113 if (check_pointer(&buf, end, bitmap, spec))
1114 return buf;
1115
dbc760bc
TH		 1116 /* reused to print numbers */
1117 spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 };
1118
1119 chunksz = nr_bits & (CHUNKSZ - 1);
1120 if (chunksz == 0)
1121 chunksz = CHUNKSZ;
1122
1123 i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ;
1124 for (; i >= 0; i -= CHUNKSZ) {
1125 u32 chunkmask, val;
1126 int word, bit;
1127
1128 chunkmask = ((1ULL << chunksz) - 1);
1129 word = i / BITS_PER_LONG;
1130 bit = i % BITS_PER_LONG;
1131 val = (bitmap[word] >> bit) & chunkmask;
1132
1133 if (!first) {
1134 if (buf < end)
1135 *buf = ',';
1136 buf++;
1137 }
1138 first = false;
1139
1140 spec.field_width = DIV_ROUND_UP(chunksz, 4);
1141 buf = number(buf, end, val, spec);
1142
1143 chunksz = CHUNKSZ;
1144 }
1145 return buf;
1146}
1147
1148static noinline_for_stack
1149char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap,
1150 struct printf_spec spec, const char *fmt)
1151{
1152 int nr_bits = max_t(int, spec.field_width, 0);
1153 /* current bit is 'cur', most recently seen range is [rbot, rtop] */
1154 int cur, rbot, rtop;
1155 bool first = true;
1156
3e5903eb
PM		 1157 if (check_pointer(&buf, end, bitmap, spec))
1158 return buf;
1159
dbc760bc
TH		 1160 rbot = cur = find_first_bit(bitmap, nr_bits);
1161 while (cur < nr_bits) {
1162 rtop = cur;
1163 cur = find_next_bit(bitmap, nr_bits, cur + 1);
1164 if (cur < nr_bits && cur <= rtop + 1)
1165 continue;
1166
1167 if (!first) {
1168 if (buf < end)
1169 *buf = ',';
1170 buf++;
1171 }
1172 first = false;
1173
ce0b4910 1174 buf = number(buf, end, rbot, default_dec_spec);
dbc760bc
TH		 1175 if (rbot < rtop) {
1176 if (buf < end)
1177 *buf = '-';
1178 buf++;
1179
ce0b4910 1180 buf = number(buf, end, rtop, default_dec_spec);
dbc760bc
TH		 1181 }
1182
1183 rbot = cur;
1184 }
1185 return buf;
1186}
1187
cf3b429b
JP		 1188static noinline_for_stack
1189char *mac_address_string(char *buf, char *end, u8 *addr,
1190 struct printf_spec spec, const char *fmt)
dd45c9cf 1191{
8a27f7c9 1192 char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
dd45c9cf
HH		 1193 char *p = mac_addr;
1194 int i;
bc7259a2 1195 char separator;
76597ff9 1196 bool reversed = false;
bc7259a2 1197
3e5903eb
PM		 1198 if (check_pointer(&buf, end, addr, spec))
1199 return buf;
1200
76597ff9
AE		 1201 switch (fmt[1]) {
1202 case 'F':
bc7259a2 1203 separator = '-';
76597ff9
AE		 1204 break;
1205
1206 case 'R':
1207 reversed = true;
1208 /* fall through */
1209
1210 default:
bc7259a2 1211 separator = ':';
76597ff9 1212 break;
bc7259a2 1213 }
dd45c9cf
HH		 1214
1215 for (i = 0; i < 6; i++) {
76597ff9
AE		 1216 if (reversed)
1217 p = hex_byte_pack(p, addr[5 - i]);
1218 else
1219 p = hex_byte_pack(p, addr[i]);
1220
8a27f7c9 1221 if (fmt[0] == 'M' && i != 5)
bc7259a2 1222 *p++ = separator;
dd45c9cf
HH		 1223 }
1224 *p = '\0';
1225
d529ac41 1226 return string_nocheck(buf, end, mac_addr, spec);
dd45c9cf
HH		 1227}
1228
cf3b429b
JP		 1229static noinline_for_stack
1230char *ip4_string(char *p, const u8 *addr, const char *fmt)
8a27f7c9
JP		 1231{
1232 int i;
0159f24e
JP		 1233 bool leading_zeros = (fmt[0] == 'i');
1234 int index;
1235 int step;
1236
1237 switch (fmt[2]) {
1238 case 'h':
1239#ifdef __BIG_ENDIAN
1240 index = 0;
1241 step = 1;
1242#else
1243 index = 3;
1244 step = -1;
1245#endif
1246 break;
1247 case 'l':
1248 index = 3;
1249 step = -1;
1250 break;
1251 case 'n':
1252 case 'b':
1253 default:
1254 index = 0;
1255 step = 1;
1256 break;
1257 }
8a27f7c9 1258 for (i = 0; i < 4; i++) {
7c43d9a3 1259 char temp[4] __aligned(2); /* hold each IP quad in reverse order */
133fd9f5 1260 int digits = put_dec_trunc8(temp, addr[index]) - temp;
8a27f7c9
JP		 1261 if (leading_zeros) {
1262 if (digits < 3)
1263 *p++ = '0';
1264 if (digits < 2)
1265 *p++ = '0';
1266 }
1267 /* reverse the digits in the quad */
1268 while (digits--)
1269 *p++ = temp[digits];
1270 if (i < 3)
1271 *p++ = '.';
0159f24e 1272 index += step;
8a27f7c9 1273 }
8a27f7c9 1274 *p = '\0';
7b9186f5 1275
8a27f7c9
JP		 1276 return p;
1277}
1278
cf3b429b
JP		 1279static noinline_for_stack
1280char *ip6_compressed_string(char *p, const char *addr)
689afa7d 1281{
7b9186f5 1282 int i, j, range;
8a27f7c9
JP		 1283 unsigned char zerolength[8];
1284 int longest = 1;
1285 int colonpos = -1;
1286 u16 word;
7b9186f5 1287 u8 hi, lo;
8a27f7c9 1288 bool needcolon = false;
eb78cd26
JP		 1289 bool useIPv4;
1290 struct in6_addr in6;
1291
1292 memcpy(&in6, addr, sizeof(struct in6_addr));
1293
1294 useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
8a27f7c9
JP		 1295
1296 memset(zerolength, 0, sizeof(zerolength));
1297
1298 if (useIPv4)
1299 range = 6;
1300 else
1301 range = 8;
1302
1303 /* find position of longest 0 run */
1304 for (i = 0; i < range; i++) {
1305 for (j = i; j < range; j++) {
eb78cd26 1306 if (in6.s6_addr16[j] != 0)
8a27f7c9
JP		 1307 break;
1308 zerolength[i]++;
1309 }
1310 }
1311 for (i = 0; i < range; i++) {
1312 if (zerolength[i] > longest) {
1313 longest = zerolength[i];
1314 colonpos = i;
1315 }
1316 }
29cf519e
JP		 1317 if (longest == 1) /* don't compress a single 0 */
1318 colonpos = -1;
689afa7d 1319
8a27f7c9
JP		 1320 /* emit address */
1321 for (i = 0; i < range; i++) {
1322 if (i == colonpos) {
1323 if (needcolon || i == 0)
1324 *p++ = ':';
1325 *p++ = ':';
1326 needcolon = false;
1327 i += longest - 1;
1328 continue;
1329 }
1330 if (needcolon) {
1331 *p++ = ':';
1332 needcolon = false;
1333 }
1334 /* hex u16 without leading 0s */
eb78cd26 1335 word = ntohs(in6.s6_addr16[i]);
8a27f7c9
JP		 1336 hi = word >> 8;
1337 lo = word & 0xff;
1338 if (hi) {
1339 if (hi > 0x0f)
55036ba7 1340 p = hex_byte_pack(p, hi);
8a27f7c9
JP		 1341 else
1342 *p++ = hex_asc_lo(hi);
55036ba7 1343 p = hex_byte_pack(p, lo);
8a27f7c9 1344 }
b5ff992b 1345 else if (lo > 0x0f)
55036ba7 1346 p = hex_byte_pack(p, lo);
8a27f7c9
JP		 1347 else
1348 *p++ = hex_asc_lo(lo);
1349 needcolon = true;
1350 }
1351
1352 if (useIPv4) {
1353 if (needcolon)
1354 *p++ = ':';
0159f24e 1355 p = ip4_string(p, &in6.s6_addr[12], "I4");
8a27f7c9 1356 }
8a27f7c9 1357 *p = '\0';
7b9186f5 1358
8a27f7c9
JP		 1359 return p;
1360}
1361
cf3b429b
JP		 1362static noinline_for_stack
1363char *ip6_string(char *p, const char *addr, const char *fmt)
8a27f7c9
JP		 1364{
1365 int i;
7b9186f5 1366
689afa7d 1367 for (i = 0; i < 8; i++) {
55036ba7
AS		 1368 p = hex_byte_pack(p, *addr++);
1369 p = hex_byte_pack(p, *addr++);
8a27f7c9 1370 if (fmt[0] == 'I' && i != 7)
689afa7d
HH		 1371 *p++ = ':';
1372 }
1373 *p = '\0';
7b9186f5 1374
8a27f7c9
JP		 1375 return p;
1376}
1377
cf3b429b
JP		 1378static noinline_for_stack
1379char *ip6_addr_string(char *buf, char *end, const u8 *addr,
1380 struct printf_spec spec, const char *fmt)
8a27f7c9
JP		 1381{
1382 char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
1383
1384 if (fmt[0] == 'I' && fmt[2] == 'c')
eb78cd26 1385 ip6_compressed_string(ip6_addr, addr);
8a27f7c9 1386 else
eb78cd26 1387 ip6_string(ip6_addr, addr, fmt);
689afa7d 1388
d529ac41 1389 return string_nocheck(buf, end, ip6_addr, spec);
689afa7d
HH		 1390}
1391
cf3b429b
JP		 1392static noinline_for_stack
1393char *ip4_addr_string(char *buf, char *end, const u8 *addr,
1394 struct printf_spec spec, const char *fmt)
4aa99606 1395{
8a27f7c9 1396 char ip4_addr[sizeof("255.255.255.255")];
4aa99606 1397
0159f24e 1398 ip4_string(ip4_addr, addr, fmt);
4aa99606 1399
d529ac41 1400 return string_nocheck(buf, end, ip4_addr, spec);
4aa99606
HH		 1401}
1402
10679643
DB		 1403static noinline_for_stack
1404char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa,
1405 struct printf_spec spec, const char *fmt)
1406{
1407 bool have_p = false, have_s = false, have_f = false, have_c = false;
1408 char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") +
1409 sizeof(":12345") + sizeof("/123456789") +
1410 sizeof("%1234567890")];
1411 char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr);
1412 const u8 *addr = (const u8 *) &sa->sin6_addr;
1413 char fmt6[2] = { fmt[0], '6' };
1414 u8 off = 0;
1415
1416 fmt++;
1417 while (isalpha(*++fmt)) {
1418 switch (*fmt) {
1419 case 'p':
1420 have_p = true;
1421 break;
1422 case 'f':
1423 have_f = true;
1424 break;
1425 case 's':
1426 have_s = true;
1427 break;
1428 case 'c':
1429 have_c = true;
1430 break;
1431 }
1432 }
1433
1434 if (have_p || have_s || have_f) {
1435 *p = '[';
1436 off = 1;
1437 }
1438
1439 if (fmt6[0] == 'I' && have_c)
1440 p = ip6_compressed_string(ip6_addr + off, addr);
1441 else
1442 p = ip6_string(ip6_addr + off, addr, fmt6);
1443
1444 if (have_p || have_s || have_f)
1445 *p++ = ']';
1446
1447 if (have_p) {
1448 *p++ = ':';
1449 p = number(p, pend, ntohs(sa->sin6_port), spec);
1450 }
1451 if (have_f) {
1452 *p++ = '/';
1453 p = number(p, pend, ntohl(sa->sin6_flowinfo &
1454 IPV6_FLOWINFO_MASK), spec);
1455 }
1456 if (have_s) {
1457 *p++ = '%';
1458 p = number(p, pend, sa->sin6_scope_id, spec);
1459 }
1460 *p = '\0';
1461
d529ac41 1462 return string_nocheck(buf, end, ip6_addr, spec);
10679643
DB		 1463}
1464
1465static noinline_for_stack
1466char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa,
1467 struct printf_spec spec, const char *fmt)
1468{
1469 bool have_p = false;
1470 char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")];
1471 char *pend = ip4_addr + sizeof(ip4_addr);
1472 const u8 *addr = (const u8 *) &sa->sin_addr.s_addr;
1473 char fmt4[3] = { fmt[0], '4', 0 };
1474
1475 fmt++;
1476 while (isalpha(*++fmt)) {
1477 switch (*fmt) {
1478 case 'p':
1479 have_p = true;
1480 break;
1481 case 'h':
1482 case 'l':
1483 case 'n':
1484 case 'b':
1485 fmt4[2] = *fmt;
1486 break;
1487 }
1488 }
1489
1490 p = ip4_string(ip4_addr, addr, fmt4);
1491 if (have_p) {
1492 *p++ = ':';
1493 p = number(p, pend, ntohs(sa->sin_port), spec);
1494 }
1495 *p = '\0';
1496
d529ac41 1497 return string_nocheck(buf, end, ip4_addr, spec);
10679643
DB		 1498}
1499
f00cc102
PM		 1500static noinline_for_stack
1501char *ip_addr_string(char *buf, char *end, const void *ptr,
1502 struct printf_spec spec, const char *fmt)
1503{
0b74d4d7
PM		 1504 char *err_fmt_msg;
1505
3e5903eb
PM		 1506 if (check_pointer(&buf, end, ptr, spec))
1507 return buf;
1508
f00cc102
PM		 1509 switch (fmt[1]) {
1510 case '6':
1511 return ip6_addr_string(buf, end, ptr, spec, fmt);
1512 case '4':
1513 return ip4_addr_string(buf, end, ptr, spec, fmt);
1514 case 'S': {
1515 const union {
1516 struct sockaddr raw;
1517 struct sockaddr_in v4;
1518 struct sockaddr_in6 v6;
1519 } *sa = ptr;
1520
1521 switch (sa->raw.sa_family) {
1522 case AF_INET:
1523 return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt);
1524 case AF_INET6:
1525 return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt);
1526 default:
c8c3b584 1527 return error_string(buf, end, "(einval)", spec);
f00cc102
PM		 1528 }}
1529 }
1530
0b74d4d7 1531 err_fmt_msg = fmt[0] == 'i' ? "(%pi?)" : "(%pI?)";
c8c3b584 1532 return error_string(buf, end, err_fmt_msg, spec);
f00cc102
PM		 1533}
1534
71dca95d
AS		 1535static noinline_for_stack
1536char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
1537 const char *fmt)
1538{
1539 bool found = true;
1540 int count = 1;
1541 unsigned int flags = 0;
1542 int len;
1543
1544 if (spec.field_width == 0)
1545 return buf; /* nothing to print */
1546
3e5903eb
PM		 1547 if (check_pointer(&buf, end, addr, spec))
1548 return buf;
71dca95d
AS		 1549
1550 do {
1551 switch (fmt[count++]) {
1552 case 'a':
1553 flags |= ESCAPE_ANY;
1554 break;
1555 case 'c':
1556 flags |= ESCAPE_SPECIAL;
1557 break;
1558 case 'h':
1559 flags |= ESCAPE_HEX;
1560 break;
1561 case 'n':
1562 flags |= ESCAPE_NULL;
1563 break;
1564 case 'o':
1565 flags |= ESCAPE_OCTAL;
1566 break;
1567 case 'p':
1568 flags |= ESCAPE_NP;
1569 break;
1570 case 's':
1571 flags |= ESCAPE_SPACE;
1572 break;
1573 default:
1574 found = false;
1575 break;
1576 }
1577 } while (found);
1578
1579 if (!flags)
1580 flags = ESCAPE_ANY_NP;
1581
1582 len = spec.field_width < 0 ? 1 : spec.field_width;
1583
41416f23
RV		 1584 /*
1585 * string_escape_mem() writes as many characters as it can to
1586 * the given buffer, and returns the total size of the output
1587 * had the buffer been big enough.
1588 */
1589 buf += string_escape_mem(addr, len, buf, buf < end ? end - buf : 0, flags, NULL);
71dca95d
AS		 1590
1591 return buf;
1592}
1593
3e5903eb
PM		 1594static char *va_format(char *buf, char *end, struct va_format *va_fmt,
1595 struct printf_spec spec, const char *fmt)
45c3e93d
PM		 1596{
1597 va_list va;
1598
3e5903eb
PM		 1599 if (check_pointer(&buf, end, va_fmt, spec))
1600 return buf;
1601
45c3e93d
PM		 1602 va_copy(va, *va_fmt->va);
1603 buf += vsnprintf(buf, end > buf ? end - buf : 0, va_fmt->fmt, va);
1604 va_end(va);
1605
1606 return buf;
1607}
1608
cf3b429b
JP		 1609static noinline_for_stack
1610char *uuid_string(char *buf, char *end, const u8 *addr,
1611 struct printf_spec spec, const char *fmt)
9ac6e44e 1612{
2b1b0d66 1613 char uuid[UUID_STRING_LEN + 1];
9ac6e44e
JP		 1614 char *p = uuid;
1615 int i;
f9727a17 1616 const u8 *index = uuid_index;
9ac6e44e
JP		 1617 bool uc = false;
1618
3e5903eb
PM		 1619 if (check_pointer(&buf, end, addr, spec))
1620 return buf;
1621
9ac6e44e
JP		 1622 switch (*(++fmt)) {
1623 case 'L':
1624 uc = true; /* fall-through */
1625 case 'l':
f9727a17 1626 index = guid_index;
9ac6e44e
JP		 1627 break;
1628 case 'B':
1629 uc = true;
1630 break;
1631 }
1632
1633 for (i = 0; i < 16; i++) {
aa4ea1c3
AS		 1634 if (uc)
1635 p = hex_byte_pack_upper(p, addr[index[i]]);
1636 else
1637 p = hex_byte_pack(p, addr[index[i]]);
9ac6e44e
JP		 1638 switch (i) {
1639 case 3:
1640 case 5:
1641 case 7:
1642 case 9:
1643 *p++ = '-';
1644 break;
1645 }
1646 }
1647
1648 *p = 0;
1649
d529ac41 1650 return string_nocheck(buf, end, uuid, spec);
9ac6e44e
JP		 1651}
1652
5b17aecf 1653static noinline_for_stack
431bca24
GU		 1654char *netdev_bits(char *buf, char *end, const void *addr,
1655 struct printf_spec spec, const char *fmt)
c8f44aff 1656{
5b17aecf
AS		 1657 unsigned long long num;
1658 int size;
1659
3e5903eb
PM		 1660 if (check_pointer(&buf, end, addr, spec))
1661 return buf;
1662
5b17aecf
AS		 1663 switch (fmt[1]) {
1664 case 'F':
1665 num = *(const netdev_features_t *)addr;
1666 size = sizeof(netdev_features_t);
1667 break;
1668 default:
c8c3b584 1669 return error_string(buf, end, "(%pN?)", spec);
5b17aecf 1670 }
c8f44aff 1671
3cab1e71 1672 return special_hex_number(buf, end, num, size);
c8f44aff
MM		 1673}
1674
aaf07621 1675static noinline_for_stack
3e5903eb
PM		 1676char *address_val(char *buf, char *end, const void *addr,
1677 struct printf_spec spec, const char *fmt)
aaf07621
JP		 1678{
1679 unsigned long long num;
3cab1e71 1680 int size;
aaf07621 1681
3e5903eb
PM		 1682 if (check_pointer(&buf, end, addr, spec))
1683 return buf;
1684
aaf07621
JP		 1685 switch (fmt[1]) {
1686 case 'd':
1687 num = *(const dma_addr_t *)addr;
3cab1e71 1688 size = sizeof(dma_addr_t);
aaf07621
JP		 1689 break;
1690 case 'p':
1691 default:
1692 num = *(const phys_addr_t *)addr;
3cab1e71 1693 size = sizeof(phys_addr_t);
aaf07621
JP		 1694 break;
1695 }
1696
3cab1e71 1697 return special_hex_number(buf, end, num, size);
aaf07621
JP		 1698}
1699
4d42c447
AS		 1700static noinline_for_stack
1701char *date_str(char *buf, char *end, const struct rtc_time *tm, bool r)
1702{
1703 int year = tm->tm_year + (r ? 0 : 1900);
1704 int mon = tm->tm_mon + (r ? 0 : 1);
1705
1706 buf = number(buf, end, year, default_dec04_spec);
1707 if (buf < end)
1708 *buf = '-';
1709 buf++;
1710
1711 buf = number(buf, end, mon, default_dec02_spec);
1712 if (buf < end)
1713 *buf = '-';
1714 buf++;
1715
1716 return number(buf, end, tm->tm_mday, default_dec02_spec);
1717}
1718
1719static noinline_for_stack
1720char *time_str(char *buf, char *end, const struct rtc_time *tm, bool r)
1721{
1722 buf = number(buf, end, tm->tm_hour, default_dec02_spec);
1723 if (buf < end)
1724 *buf = ':';
1725 buf++;
1726
1727 buf = number(buf, end, tm->tm_min, default_dec02_spec);
1728 if (buf < end)
1729 *buf = ':';
1730 buf++;
1731
1732 return number(buf, end, tm->tm_sec, default_dec02_spec);
1733}
1734
1735static noinline_for_stack
3e5903eb
PM		 1736char *rtc_str(char *buf, char *end, const struct rtc_time *tm,
1737 struct printf_spec spec, const char *fmt)
4d42c447
AS		 1738{
1739 bool have_t = true, have_d = true;
1740 bool raw = false;
1741 int count = 2;
1742
3e5903eb
PM		 1743 if (check_pointer(&buf, end, tm, spec))
1744 return buf;
1745
4d42c447
AS		 1746 switch (fmt[count]) {
1747 case 'd':
1748 have_t = false;
1749 count++;
1750 break;
1751 case 't':
1752 have_d = false;
1753 count++;
1754 break;
1755 }
1756
1757 raw = fmt[count] == 'r';
1758
1759 if (have_d)
1760 buf = date_str(buf, end, tm, raw);
1761 if (have_d && have_t) {
1762 /* Respect ISO 8601 */
1763 if (buf < end)
1764 *buf = 'T';
1765 buf++;
1766 }
1767 if (have_t)
1768 buf = time_str(buf, end, tm, raw);
1769
1770 return buf;
1771}
1772
1773static noinline_for_stack
1774char *time_and_date(char *buf, char *end, void *ptr, struct printf_spec spec,
1775 const char *fmt)
1776{
1777 switch (fmt[1]) {
1778 case 'R':
3e5903eb 1779 return rtc_str(buf, end, (const struct rtc_time *)ptr, spec, fmt);
4d42c447 1780 default:
c8c3b584 1781 return error_string(buf, end, "(%ptR?)", spec);
4d42c447
AS		 1782 }
1783}
1784
900cca29
GU		 1785static noinline_for_stack
1786char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec,
1787 const char *fmt)
1788{
0b74d4d7 1789 if (!IS_ENABLED(CONFIG_HAVE_CLK))
c8c3b584 1790 return error_string(buf, end, "(%pC?)", spec);
0b74d4d7 1791
3e5903eb
PM		 1792 if (check_pointer(&buf, end, clk, spec))
1793 return buf;
900cca29
GU		 1794
1795 switch (fmt[1]) {
900cca29
GU		 1796 case 'n':
1797 default:
1798#ifdef CONFIG_COMMON_CLK
1799 return string(buf, end, __clk_get_name(clk), spec);
1800#else
c8c3b584 1801 return error_string(buf, end, "(%pC?)", spec);
900cca29
GU		 1802#endif
1803 }
1804}
1805
edf14cdb
VB		 1806static
1807char *format_flags(char *buf, char *end, unsigned long flags,
1808 const struct trace_print_flags *names)
1809{
1810 unsigned long mask;
edf14cdb
VB		 1811
1812 for ( ; flags && names->name; names++) {
1813 mask = names->mask;
1814 if ((flags & mask) != mask)
1815 continue;
1816
abd4fe62 1817 buf = string(buf, end, names->name, default_str_spec);
edf14cdb
VB		 1818
1819 flags &= ~mask;
1820 if (flags) {
1821 if (buf < end)
1822 *buf = '|';
1823 buf++;
1824 }
1825 }
1826
1827 if (flags)
54433973 1828 buf = number(buf, end, flags, default_flag_spec);
edf14cdb
VB		 1829
1830 return buf;
1831}
1832
1833static noinline_for_stack
0b74d4d7
PM		 1834char *flags_string(char *buf, char *end, void *flags_ptr,
1835 struct printf_spec spec, const char *fmt)
edf14cdb
VB		 1836{
1837 unsigned long flags;
1838 const struct trace_print_flags *names;
1839
3e5903eb
PM		 1840 if (check_pointer(&buf, end, flags_ptr, spec))
1841 return buf;
1842
edf14cdb
VB		 1843 switch (fmt[1]) {
1844 case 'p':
1845 flags = *(unsigned long *)flags_ptr;
1846 /* Remove zone id */
1847 flags &= (1UL << NR_PAGEFLAGS) - 1;
1848 names = pageflag_names;
1849 break;
1850 case 'v':
1851 flags = *(unsigned long *)flags_ptr;
1852 names = vmaflag_names;
1853 break;
1854 case 'g':
1855 flags = *(gfp_t *)flags_ptr;
1856 names = gfpflag_names;
1857 break;
1858 default:
c8c3b584 1859 return error_string(buf, end, "(%pG?)", spec);
edf14cdb
VB		 1860 }
1861
1862 return format_flags(buf, end, flags, names);
1863}
1864
ce4fecf1
PA		 1865static const char *device_node_name_for_depth(const struct device_node *np, int depth)
1866{
1867 for ( ; np && depth; depth--)
1868 np = np->parent;
1869
1870 return kbasename(np->full_name);
1871}
1872
1873static noinline_for_stack
1874char *device_node_gen_full_name(const struct device_node *np, char *buf, char *end)
1875{
1876 int depth;
1877 const struct device_node *parent = np->parent;
ce4fecf1
PA		 1878
1879 /* special case for root node */
1880 if (!parent)
d529ac41 1881 return string_nocheck(buf, end, "/", default_str_spec);
ce4fecf1
PA		 1882
1883 for (depth = 0; parent->parent; depth++)
1884 parent = parent->parent;
1885
1886 for ( ; depth >= 0; depth--) {
d529ac41 1887 buf = string_nocheck(buf, end, "/", default_str_spec);
ce4fecf1 1888 buf = string(buf, end, device_node_name_for_depth(np, depth),
abd4fe62 1889 default_str_spec);
ce4fecf1
PA		 1890 }
1891 return buf;
1892}
1893
1894static noinline_for_stack
1895char *device_node_string(char *buf, char *end, struct device_node *dn,
1896 struct printf_spec spec, const char *fmt)
1897{
1898 char tbuf[sizeof("xxxx") + 1];
1899 const char *p;
1900 int ret;
1901 char *buf_start = buf;
1902 struct property *prop;
1903 bool has_mult, pass;
1904 static const struct printf_spec num_spec = {
1905 .flags = SMALL,
1906 .field_width = -1,
1907 .precision = -1,
1908 .base = 10,
1909 };
1910
1911 struct printf_spec str_spec = spec;
1912 str_spec.field_width = -1;
1913
1914 if (!IS_ENABLED(CONFIG_OF))
c8c3b584 1915 return error_string(buf, end, "(%pOF?)", spec);
ce4fecf1 1916
3e5903eb
PM		 1917 if (check_pointer(&buf, end, dn, spec))
1918 return buf;
ce4fecf1
PA		 1919
1920 /* simple case without anything any more format specifiers */
1921 fmt++;
1922 if (fmt[0] == '\0' || strcspn(fmt,"fnpPFcC") > 0)
1923 fmt = "f";
1924
1925 for (pass = false; strspn(fmt,"fnpPFcC"); fmt++, pass = true) {
6d0a70a2 1926 int precision;
ce4fecf1
PA		 1927 if (pass) {
1928 if (buf < end)
1929 *buf = ':';
1930 buf++;
1931 }
1932
1933 switch (*fmt) {
1934 case 'f': /* full_name */
1935 buf = device_node_gen_full_name(dn, buf, end);
1936 break;
1937 case 'n': /* name */
6d0a70a2
RH		 1938 p = kbasename(of_node_full_name(dn));
1939 precision = str_spec.precision;
1940 str_spec.precision = strchrnul(p, '@') - p;
1941 buf = string(buf, end, p, str_spec);
1942 str_spec.precision = precision;
ce4fecf1
PA		 1943 break;
1944 case 'p': /* phandle */
1945 buf = number(buf, end, (unsigned int)dn->phandle, num_spec);
1946 break;
1947 case 'P': /* path-spec */
1948 p = kbasename(of_node_full_name(dn));
1949 if (!p[1])
1950 p = "/";
1951 buf = string(buf, end, p, str_spec);
1952 break;
1953 case 'F': /* flags */
1954 tbuf[0] = of_node_check_flag(dn, OF_DYNAMIC) ? 'D' : '-';
1955 tbuf[1] = of_node_check_flag(dn, OF_DETACHED) ? 'd' : '-';
1956 tbuf[2] = of_node_check_flag(dn, OF_POPULATED) ? 'P' : '-';
1957 tbuf[3] = of_node_check_flag(dn, OF_POPULATED_BUS) ? 'B' : '-';
1958 tbuf[4] = 0;
d529ac41 1959 buf = string_nocheck(buf, end, tbuf, str_spec);
ce4fecf1
PA		 1960 break;
1961 case 'c': /* major compatible string */
1962 ret = of_property_read_string(dn, "compatible", &p);
1963 if (!ret)
1964 buf = string(buf, end, p, str_spec);
1965 break;
1966 case 'C': /* full compatible string */
1967 has_mult = false;
1968 of_property_for_each_string(dn, "compatible", prop, p) {
1969 if (has_mult)
d529ac41
PM		 1970 buf = string_nocheck(buf, end, ",", str_spec);
1971 buf = string_nocheck(buf, end, "\"", str_spec);
ce4fecf1 1972 buf = string(buf, end, p, str_spec);
d529ac41 1973 buf = string_nocheck(buf, end, "\"", str_spec);
ce4fecf1
PA		 1974
1975 has_mult = true;
1976 }
1977 break;
1978 default:
1979 break;
1980 }
1981 }
1982
1983 return widen_string(buf, buf - buf_start, end, spec);
1984}
1985
798cc27a
PM		 1986static char *kobject_string(char *buf, char *end, void *ptr,
1987 struct printf_spec spec, const char *fmt)
1988{
1989 switch (fmt[1]) {
1990 case 'F':
1991 return device_node_string(buf, end, ptr, spec, fmt + 1);
1992 }
1993
c8c3b584 1994 return error_string(buf, end, "(%pO?)", spec);
798cc27a
PM		 1995}
1996
4d8a743c
LT		 1997/*
1998 * Show a '%p' thing. A kernel extension is that the '%p' is followed
1999 * by an extra set of alphanumeric characters that are extended format
2000 * specifiers.
2001 *
0b523769
JP		 2002 * Please update scripts/checkpatch.pl when adding/removing conversion
2003 * characters. (Search for "check for vsprintf extension").
2004 *
332d2e78
LT		 2005 * Right now we handle:
2006 *
cdb7e52d
SS		 2007 * - 'S' For symbolic direct pointers (or function descriptors) with offset
2008 * - 's' For symbolic direct pointers (or function descriptors) without offset
2009 * - 'F' Same as 'S'
2010 * - 'f' Same as 's'
b0d33c2b 2011 * - '[FfSs]R' as above with __builtin_extract_return_addr() translation
0f77a8d3 2012 * - 'B' For backtraced symbolic direct pointers with offset
c7dabef8
BH		 2013 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
2014 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
dbc760bc
TH		 2015 * - 'b[l]' For a bitmap, the number of bits is determined by the field
2016 * width which must be explicitly specified either as part of the
2017 * format string '%32b[l]' or through '%*b[l]', [l] selects
2018 * range-list format instead of hex format
dd45c9cf
HH		 2019 * - 'M' For a 6-byte MAC address, it prints the address in the
2020 * usual colon-separated hex notation
8a27f7c9 2021 * - 'm' For a 6-byte MAC address, it prints the hex address without colons
bc7259a2 2022 * - 'MF' For a 6-byte MAC FDDI address, it prints the address
c8e00060 2023 * with a dash-separated hex notation
7c59154e 2024 * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth)
8a27f7c9
JP		 2025 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
2026 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
2027 * IPv6 uses colon separated network-order 16 bit hex with leading 0's
10679643
DB		 2028 * [S][pfs]
2029 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
2030 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
8a27f7c9
JP		 2031 * - 'i' [46] for 'raw' IPv4/IPv6 addresses
2032 * IPv6 omits the colons (01020304...0f)
2033 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
10679643
DB		 2034 * [S][pfs]
2035 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
2036 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
2037 * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order
2038 * - 'I[6S]c' for IPv6 addresses printed as specified by
29cf519e 2039 * http://tools.ietf.org/html/rfc5952
71dca95d
AS		 2040 * - 'E[achnops]' For an escaped buffer, where rules are defined by combination
2041 * of the following flags (see string_escape_mem() for the
2042 * details):
2043 * a - ESCAPE_ANY
2044 * c - ESCAPE_SPECIAL
2045 * h - ESCAPE_HEX
2046 * n - ESCAPE_NULL
2047 * o - ESCAPE_OCTAL
2048 * p - ESCAPE_NP
2049 * s - ESCAPE_SPACE
2050 * By default ESCAPE_ANY_NP is used.
9ac6e44e
JP		 2051 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
2052 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
2053 * Options for %pU are:
2054 * b big endian lower case hex (default)
2055 * B big endian UPPER case hex
2056 * l little endian lower case hex
2057 * L little endian UPPER case hex
2058 * big endian output byte order is:
2059 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
2060 * little endian output byte order is:
2061 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
7db6f5fb
JP		 2062 * - 'V' For a struct va_format which contains a format string * and va_list *,
2063 * call vsnprintf(->format, *->va_list).
2064 * Implements a "recursive vsnprintf".
2065 * Do not use this feature without some mechanism to verify the
2066 * correctness of the format string and va_list arguments.
455cd5ab 2067 * - 'K' For a kernel pointer that should be hidden from unprivileged users
c8f44aff 2068 * - 'NF' For a netdev_features_t
31550a16
AS		 2069 * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with
2070 * a certain separator (' ' by default):
2071 * C colon
2072 * D dash
2073 * N no separator
2074 * The maximum supported length is 64 bytes of the input. Consider
2075 * to use print_hex_dump() for the larger input.
aaf07621
JP		 2076 * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives
2077 * (default assumed to be phys_addr_t, passed by reference)
c0d92a57
OJ		 2078 * - 'd[234]' For a dentry name (optionally 2-4 last components)
2079 * - 'D[234]' Same as 'd' but for a struct file
1031bc58 2080 * - 'g' For block_device name (gendisk + partition number)
4d42c447
AS		 2081 * - 't[R][dt][r]' For time and date as represented:
2082 * R struct rtc_time
900cca29
GU		 2083 * - 'C' For a clock, it prints the name (Common Clock Framework) or address
2084 * (legacy clock framework) of the clock
2085 * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address
2086 * (legacy clock framework) of the clock
edf14cdb
VB		 2087 * - 'G' For flags to be printed as a collection of symbolic strings that would
2088 * construct the specific value. Supported flags given by option:
2089 * p page flags (see struct page) given as pointer to unsigned long
2090 * g gfp flags (GFP_* and __GFP_*) given as pointer to gfp_t
2091 * v vma flags (VM_*) given as pointer to unsigned long
94ac8f20
GU		 2092 * - 'OF[fnpPcCF]' For a device tree object
2093 * Without any optional arguments prints the full_name
2094 * f device node full_name
2095 * n device node name
2096 * p device node phandle
2097 * P device node path spec (name + @unit)
2098 * F device node flags
2099 * c major compatible string
2100 * C full compatible string
7b1924a1
TH		 2101 * - 'x' For printing the address. Equivalent to "%lx".
2102 *
b3ed2321
TH		 2103 * ** When making changes please also update:
2104 * Documentation/core-api/printk-formats.rst
9ac6e44e 2105 *
ad67b74d
TH		 2106 * Note: The default behaviour (unadorned %p) is to hash the address,
2107 * rendering it useful as a unique identifier.
4d8a743c 2108 */
cf3b429b
JP		 2109static noinline_for_stack
2110char *pointer(const char *fmt, char *buf, char *end, void *ptr,
2111 struct printf_spec spec)
78a8bf69 2112{
0fe1ef24
LT		 2113 switch (*fmt) {
2114 case 'F':
0c8b946e 2115 case 'f':
0fe1ef24 2116 case 'S':
9ac6e44e 2117 case 's':
04b8eb7a
SS		 2118 ptr = dereference_symbol_descriptor(ptr);
2119 /* Fallthrough */
0f77a8d3 2120 case 'B':
b0d33c2b 2121 return symbol_string(buf, end, ptr, spec, fmt);
332d2e78 2122 case 'R':
c7dabef8 2123 case 'r':
fd95541e 2124 return resource_string(buf, end, ptr, spec, fmt);
31550a16
AS		 2125 case 'h':
2126 return hex_string(buf, end, ptr, spec, fmt);
dbc760bc
TH		 2127 case 'b':
2128 switch (fmt[1]) {
2129 case 'l':
2130 return bitmap_list_string(buf, end, ptr, spec, fmt);
2131 default:
2132 return bitmap_string(buf, end, ptr, spec, fmt);
2133 }
8a27f7c9
JP		 2134 case 'M': /* Colon separated: 00:01:02:03:04:05 */
2135 case 'm': /* Contiguous: 000102030405 */
76597ff9
AE		 2136 /* [mM]F (FDDI) */
2137 /* [mM]R (Reverse order; Bluetooth) */
8a27f7c9
JP		 2138 return mac_address_string(buf, end, ptr, spec, fmt);
2139 case 'I': /* Formatted IP supported
2140 * 4: 1.2.3.4
2141 * 6: 0001:0203:...:0708
2142 * 6c: 1::708 or 1::1.2.3.4
2143 */
2144 case 'i': /* Contiguous:
2145 * 4: 001.002.003.004
2146 * 6: 000102...0f
2147 */
f00cc102 2148 return ip_addr_string(buf, end, ptr, spec, fmt);
71dca95d
AS		 2149 case 'E':
2150 return escaped_string(buf, end, ptr, spec, fmt);
9ac6e44e
JP		 2151 case 'U':
2152 return uuid_string(buf, end, ptr, spec, fmt);
7db6f5fb 2153 case 'V':
3e5903eb 2154 return va_format(buf, end, ptr, spec, fmt);
455cd5ab 2155 case 'K':
57e73442 2156 return restricted_pointer(buf, end, ptr, spec);
c8f44aff 2157 case 'N':
431bca24 2158 return netdev_bits(buf, end, ptr, spec, fmt);
7d799210 2159 case 'a':
3e5903eb 2160 return address_val(buf, end, ptr, spec, fmt);
4b6ccca7
AV		 2161 case 'd':
2162 return dentry_name(buf, end, ptr, spec, fmt);
4d42c447
AS		 2163 case 't':
2164 return time_and_date(buf, end, ptr, spec, fmt);
900cca29
GU		 2165 case 'C':
2166 return clock(buf, end, ptr, spec, fmt);
4b6ccca7
AV		 2167 case 'D':
2168 return dentry_name(buf, end,
2169 ((const struct file *)ptr)->f_path.dentry,
2170 spec, fmt);
1031bc58
DM		 2171#ifdef CONFIG_BLOCK
2172 case 'g':
2173 return bdev_name(buf, end, ptr, spec, fmt);
2174#endif
2175
edf14cdb 2176 case 'G':
0b74d4d7 2177 return flags_string(buf, end, ptr, spec, fmt);
ce4fecf1 2178 case 'O':
798cc27a 2179 return kobject_string(buf, end, ptr, spec, fmt);
7b1924a1
TH		 2180 case 'x':
2181 return pointer_string(buf, end, ptr, spec);
fef20d9c 2182 }
fef20d9c 2183
ad67b74d
TH		 2184 /* default is to _not_ leak addresses, hash before printing */
2185 return ptr_to_id(buf, end, ptr, spec);
fef20d9c
FW		 2186}
2187
2188/*
2189 * Helper function to decode printf style format.
2190 * Each call decode a token from the format and return the
2191 * number of characters read (or likely the delta where it wants
2192 * to go on the next call).
2193 * The decoded token is returned through the parameters
2194 *
2195 * 'h', 'l', or 'L' for integer fields
2196 * 'z' support added 23/7/1999 S.H.
2197 * 'z' changed to 'Z' --davidm 1/25/99
5b5e0928 2198 * 'Z' changed to 'z' --adobriyan 2017-01-25
fef20d9c
FW		 2199 * 't' added for ptrdiff_t
2200 *
2201 * @fmt: the format string
2202 * @type of the token returned
2203 * @flags: various flags such as +, -, # tokens..
2204 * @field_width: overwritten width
2205 * @base: base of the number (octal, hex, ...)
2206 * @precision: precision of a number
2207 * @qualifier: qualifier of a number (long, size_t, ...)
2208 */
cf3b429b
JP		 2209static noinline_for_stack
2210int format_decode(const char *fmt, struct printf_spec *spec)
fef20d9c
FW		 2211{
2212 const char *start = fmt;
d0484193 2213 char qualifier;
fef20d9c
FW		 2214
2215 /* we finished early by reading the field width */
ed681a91 2216 if (spec->type == FORMAT_TYPE_WIDTH) {
fef20d9c
FW		 2217 if (spec->field_width < 0) {
2218 spec->field_width = -spec->field_width;
2219 spec->flags |= LEFT;
2220 }
2221 spec->type = FORMAT_TYPE_NONE;
2222 goto precision;
2223 }
2224
2225 /* we finished early by reading the precision */
2226 if (spec->type == FORMAT_TYPE_PRECISION) {
2227 if (spec->precision < 0)
2228 spec->precision = 0;
2229
2230 spec->type = FORMAT_TYPE_NONE;
2231 goto qualifier;
2232 }
2233
2234 /* By default */
2235 spec->type = FORMAT_TYPE_NONE;
2236
2237 for (; *fmt ; ++fmt) {
2238 if (*fmt == '%')
2239 break;
2240 }
2241
2242 /* Return the current non-format string */
2243 if (fmt != start || !*fmt)
2244 return fmt - start;
2245
2246 /* Process flags */
2247 spec->flags = 0;
2248
2249 while (1) { /* this also skips first '%' */
2250 bool found = true;
2251
2252 ++fmt;
2253
2254 switch (*fmt) {
2255 case '-': spec->flags |= LEFT; break;
2256 case '+': spec->flags |= PLUS; break;
2257 case ' ': spec->flags |= SPACE; break;
2258 case '#': spec->flags |= SPECIAL; break;
2259 case '0': spec->flags |= ZEROPAD; break;
2260 default: found = false;
2261 }
2262
2263 if (!found)
2264 break;
2265 }
2266
2267 /* get field width */
2268 spec->field_width = -1;
2269
2270 if (isdigit(*fmt))
2271 spec->field_width = skip_atoi(&fmt);
2272 else if (*fmt == '*') {
2273 /* it's the next argument */
ed681a91 2274 spec->type = FORMAT_TYPE_WIDTH;
fef20d9c
FW		 2275 return ++fmt - start;
2276 }
2277
2278precision:
2279 /* get the precision */
2280 spec->precision = -1;
2281 if (*fmt == '.') {
2282 ++fmt;
2283 if (isdigit(*fmt)) {
2284 spec->precision = skip_atoi(&fmt);
2285 if (spec->precision < 0)
2286 spec->precision = 0;
2287 } else if (*fmt == '*') {
2288 /* it's the next argument */
adf26f84 2289 spec->type = FORMAT_TYPE_PRECISION;
fef20d9c
FW		 2290 return ++fmt - start;
2291 }
2292 }
2293
2294qualifier:
2295 /* get the conversion qualifier */
d0484193 2296 qualifier = 0;
75fb8f26 2297 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
5b5e0928 2298 *fmt == 'z' || *fmt == 't') {
d0484193
RV		 2299 qualifier = *fmt++;
2300 if (unlikely(qualifier == *fmt)) {
2301 if (qualifier == 'l') {
2302 qualifier = 'L';
a4e94ef0 2303 ++fmt;
d0484193
RV		 2304 } else if (qualifier == 'h') {
2305 qualifier = 'H';
a4e94ef0
Z		 2306 ++fmt;
2307 }
fef20d9c
FW		 2308 }
2309 }
2310
2311 /* default base */
2312 spec->base = 10;
2313 switch (*fmt) {
2314 case 'c':
2315 spec->type = FORMAT_TYPE_CHAR;
2316 return ++fmt - start;
2317
2318 case 's':
2319 spec->type = FORMAT_TYPE_STR;
2320 return ++fmt - start;
2321
2322 case 'p':
2323 spec->type = FORMAT_TYPE_PTR;
ffbfed03 2324 return ++fmt - start;
fef20d9c 2325
fef20d9c
FW		 2326 case '%':
2327 spec->type = FORMAT_TYPE_PERCENT_CHAR;
2328 return ++fmt - start;
2329
2330 /* integer number formats - set up the flags and "break" */
2331 case 'o':
2332 spec->base = 8;
2333 break;
2334
2335 case 'x':
2336 spec->flags |= SMALL;
7e6bd6f3 2337 /* fall through */
fef20d9c
FW		 2338
2339 case 'X':
2340 spec->base = 16;
2341 break;
2342
2343 case 'd':
2344 case 'i':
39e874f8 2345 spec->flags |= SIGN;
fef20d9c 2346 case 'u':
4aa99606 2347 break;
fef20d9c 2348
708d96fd
RM		 2349 case 'n':
2350 /*
b006f19b
RV		 2351 * Since %n poses a greater security risk than
2352 * utility, treat it as any other invalid or
2353 * unsupported format specifier.
708d96fd 2354 */
708d96fd
RM		 2355 /* Fall-through */
2356
fef20d9c 2357 default:
b006f19b 2358 WARN_ONCE(1, "Please remove unsupported %%%c in format string\n", *fmt);
fef20d9c
FW		 2359 spec->type = FORMAT_TYPE_INVALID;
2360 return fmt - start;
0fe1ef24 2361 }
fef20d9c 2362
d0484193 2363 if (qualifier == 'L')
fef20d9c 2364 spec->type = FORMAT_TYPE_LONG_LONG;
d0484193 2365 else if (qualifier == 'l') {
51be17df
RV		 2366 BUILD_BUG_ON(FORMAT_TYPE_ULONG + SIGN != FORMAT_TYPE_LONG);
2367 spec->type = FORMAT_TYPE_ULONG + (spec->flags & SIGN);
5b5e0928 2368 } else if (qualifier == 'z') {
fef20d9c 2369 spec->type = FORMAT_TYPE_SIZE_T;
d0484193 2370 } else if (qualifier == 't') {
fef20d9c 2371 spec->type = FORMAT_TYPE_PTRDIFF;
d0484193 2372 } else if (qualifier == 'H') {
51be17df
RV		 2373 BUILD_BUG_ON(FORMAT_TYPE_UBYTE + SIGN != FORMAT_TYPE_BYTE);
2374 spec->type = FORMAT_TYPE_UBYTE + (spec->flags & SIGN);
d0484193 2375 } else if (qualifier == 'h') {
51be17df
RV		 2376 BUILD_BUG_ON(FORMAT_TYPE_USHORT + SIGN != FORMAT_TYPE_SHORT);
2377 spec->type = FORMAT_TYPE_USHORT + (spec->flags & SIGN);
fef20d9c 2378 } else {
51be17df
RV		 2379 BUILD_BUG_ON(FORMAT_TYPE_UINT + SIGN != FORMAT_TYPE_INT);
2380 spec->type = FORMAT_TYPE_UINT + (spec->flags & SIGN);
78a8bf69 2381 }
fef20d9c
FW		 2382
2383 return ++fmt - start;
78a8bf69
LT		 2384}
2385
4d72ba01
RV		 2386static void
2387set_field_width(struct printf_spec *spec, int width)
2388{
2389 spec->field_width = width;
2390 if (WARN_ONCE(spec->field_width != width, "field width %d too large", width)) {
2391 spec->field_width = clamp(width, -FIELD_WIDTH_MAX, FIELD_WIDTH_MAX);
2392 }
2393}
2394
2395static void
2396set_precision(struct printf_spec *spec, int prec)
2397{
2398 spec->precision = prec;
2399 if (WARN_ONCE(spec->precision != prec, "precision %d too large", prec)) {
2400 spec->precision = clamp(prec, 0, PRECISION_MAX);
2401 }
2402}
2403
1da177e4
LT		 2404/**
2405 * vsnprintf - Format a string and place it in a buffer
2406 * @buf: The buffer to place the result into
2407 * @size: The size of the buffer, including the trailing null space
2408 * @fmt: The format string to use
2409 * @args: Arguments for the format string
2410 *
d7ec9a05
RV		 2411 * This function generally follows C99 vsnprintf, but has some
2412 * extensions and a few limitations:
2413 *
6cc89134 2414 * - ``%n`` is unsupported
2415 * - ``%p*`` is handled by pointer()
5e4ee7b1 2416 *
27e7c0e8 2417 * See pointer() or Documentation/core-api/printk-formats.rst for more
5e4ee7b1 2418 * extensive description.
20036fdc 2419 *
6cc89134 2420 * **Please update the documentation in both places when making changes**
80f548e0 2421 *
1da177e4
LT		 2422 * The return value is the number of characters which would
2423 * be generated for the given input, excluding the trailing
2424 * '\0', as per ISO C99. If you want to have the exact
2425 * number of characters written into @buf as return value
72fd4a35 2426 * (not including the trailing '\0'), use vscnprintf(). If the
1da177e4
LT		 2427 * return is greater than or equal to @size, the resulting
2428 * string is truncated.
2429 *
ba1835eb 2430 * If you're not already dealing with a va_list consider using snprintf().
1da177e4
LT		 2431 */
2432int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
2433{
1da177e4 2434 unsigned long long num;
d4be151b 2435 char *str, *end;
fef20d9c 2436 struct printf_spec spec = {0};
1da177e4 2437
f796937a
JF		 2438 /* Reject out-of-range values early. Large positive sizes are
2439 used for unknown buffer sizes. */
2aa2f9e2 2440 if (WARN_ON_ONCE(size > INT_MAX))
1da177e4 2441 return 0;
1da177e4
LT		 2442
2443 str = buf;
f796937a 2444 end = buf + size;
1da177e4 2445
f796937a
JF		 2446 /* Make sure end is always >= buf */
2447 if (end < buf) {
2448 end = ((void *)-1);
2449 size = end - buf;
1da177e4
LT		 2450 }
2451
fef20d9c
FW		 2452 while (*fmt) {
2453 const char *old_fmt = fmt;
d4be151b 2454 int read = format_decode(fmt, &spec);
1da177e4 2455
fef20d9c 2456 fmt += read;
1da177e4 2457
fef20d9c
FW		 2458 switch (spec.type) {
2459 case FORMAT_TYPE_NONE: {
2460 int copy = read;
2461 if (str < end) {
2462 if (copy > end - str)
2463 copy = end - str;
2464 memcpy(str, old_fmt, copy);
1da177e4 2465 }
fef20d9c
FW		 2466 str += read;
2467 break;
1da177e4
LT		 2468 }
2469
ed681a91 2470 case FORMAT_TYPE_WIDTH:
4d72ba01 2471 set_field_width(&spec, va_arg(args, int));
fef20d9c 2472 break;
1da177e4 2473
fef20d9c 2474 case FORMAT_TYPE_PRECISION:
4d72ba01 2475 set_precision(&spec, va_arg(args, int));
fef20d9c 2476 break;
1da177e4 2477
d4be151b
AGR		 2478 case FORMAT_TYPE_CHAR: {
2479 char c;
2480
fef20d9c
FW		 2481 if (!(spec.flags & LEFT)) {
2482 while (--spec.field_width > 0) {
f796937a 2483 if (str < end)
1da177e4
LT		 2484 *str = ' ';
2485 ++str;
1da177e4 2486
fef20d9c
FW		 2487 }
2488 }
2489 c = (unsigned char) va_arg(args, int);
2490 if (str < end)
2491 *str = c;
2492 ++str;
2493 while (--spec.field_width > 0) {
f796937a 2494 if (str < end)
fef20d9c 2495 *str = ' ';
1da177e4 2496 ++str;
fef20d9c
FW		 2497 }
2498 break;
d4be151b 2499 }
1da177e4 2500
fef20d9c
FW		 2501 case FORMAT_TYPE_STR:
2502 str = string(str, end, va_arg(args, char *), spec);
2503 break;
1da177e4 2504
fef20d9c 2505 case FORMAT_TYPE_PTR:
ffbfed03 2506 str = pointer(fmt, str, end, va_arg(args, void *),
fef20d9c
FW		 2507 spec);
2508 while (isalnum(*fmt))
2509 fmt++;
2510 break;
1da177e4 2511
fef20d9c
FW		 2512 case FORMAT_TYPE_PERCENT_CHAR:
2513 if (str < end)
2514 *str = '%';
2515 ++str;
2516 break;
1da177e4 2517
fef20d9c 2518 case FORMAT_TYPE_INVALID:
b006f19b
RV		 2519 /*
2520 * Presumably the arguments passed gcc's type
2521 * checking, but there is no safe or sane way
2522 * for us to continue parsing the format and
2523 * fetching from the va_list; the remaining
2524 * specifiers and arguments would be out of
2525 * sync.
2526 */
2527 goto out;
fef20d9c 2528
fef20d9c
FW		 2529 default:
2530 switch (spec.type) {
2531 case FORMAT_TYPE_LONG_LONG:
2532 num = va_arg(args, long long);
2533 break;
2534 case FORMAT_TYPE_ULONG:
2535 num = va_arg(args, unsigned long);
2536 break;
2537 case FORMAT_TYPE_LONG:
2538 num = va_arg(args, long);
2539 break;
2540 case FORMAT_TYPE_SIZE_T:
ef124960
JG		 2541 if (spec.flags & SIGN)
2542 num = va_arg(args, ssize_t);
2543 else
2544 num = va_arg(args, size_t);
fef20d9c
FW		 2545 break;
2546 case FORMAT_TYPE_PTRDIFF:
2547 num = va_arg(args, ptrdiff_t);
2548 break;
a4e94ef0
Z		 2549 case FORMAT_TYPE_UBYTE:
2550 num = (unsigned char) va_arg(args, int);
2551 break;
2552 case FORMAT_TYPE_BYTE:
2553 num = (signed char) va_arg(args, int);
2554 break;
fef20d9c
FW		 2555 case FORMAT_TYPE_USHORT:
2556 num = (unsigned short) va_arg(args, int);
2557 break;
2558 case FORMAT_TYPE_SHORT:
2559 num = (short) va_arg(args, int);
2560 break;
39e874f8
FW		 2561 case FORMAT_TYPE_INT:
2562 num = (int) va_arg(args, int);
fef20d9c
FW		 2563 break;
2564 default:
2565 num = va_arg(args, unsigned int);
2566 }
2567
2568 str = number(str, end, num, spec);
1da177e4 2569 }
1da177e4 2570 }
fef20d9c 2571
b006f19b 2572out:
f796937a
JF		 2573 if (size > 0) {
2574 if (str < end)
2575 *str = '\0';
2576 else
0a6047ee 2577 end[-1] = '\0';
f796937a 2578 }
fef20d9c 2579
f796937a 2580 /* the trailing null byte doesn't count towards the total */
1da177e4 2581 return str-buf;
fef20d9c 2582
1da177e4 2583}
1da177e4
LT		 2584EXPORT_SYMBOL(vsnprintf);
2585
2586/**
2587 * vscnprintf - Format a string and place it in a buffer
2588 * @buf: The buffer to place the result into
2589 * @size: The size of the buffer, including the trailing null space
2590 * @fmt: The format string to use
2591 * @args: Arguments for the format string
2592 *
2593 * The return value is the number of characters which have been written into
b921c69f 2594 * the @buf not including the trailing '\0'. If @size is == 0 the function
1da177e4
LT		 2595 * returns 0.
2596 *
ba1835eb 2597 * If you're not already dealing with a va_list consider using scnprintf().
20036fdc
AK		 2598 *
2599 * See the vsnprintf() documentation for format string extensions over C99.
1da177e4
LT		 2600 */
2601int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
2602{
2603 int i;
2604
7b9186f5
AGR		 2605 i = vsnprintf(buf, size, fmt, args);
2606
b921c69f
AA		 2607 if (likely(i < size))
2608 return i;
2609 if (size != 0)
2610 return size - 1;
2611 return 0;
1da177e4 2612}
1da177e4
LT		 2613EXPORT_SYMBOL(vscnprintf);
2614
2615/**
2616 * snprintf - Format a string and place it in a buffer
2617 * @buf: The buffer to place the result into
2618 * @size: The size of the buffer, including the trailing null space
2619 * @fmt: The format string to use
2620 * @...: Arguments for the format string
2621 *
2622 * The return value is the number of characters which would be
2623 * generated for the given input, excluding the trailing null,
2624 * as per ISO C99. If the return is greater than or equal to
2625 * @size, the resulting string is truncated.
20036fdc
AK		 2626 *
2627 * See the vsnprintf() documentation for format string extensions over C99.
1da177e4 2628 */
7b9186f5 2629int snprintf(char *buf, size_t size, const char *fmt, ...)
1da177e4
LT		 2630{
2631 va_list args;
2632 int i;
2633
2634 va_start(args, fmt);
7b9186f5 2635 i = vsnprintf(buf, size, fmt, args);
1da177e4 2636 va_end(args);
7b9186f5 2637
1da177e4
LT		 2638 return i;
2639}
1da177e4
LT		 2640EXPORT_SYMBOL(snprintf);
2641
2642/**
2643 * scnprintf - Format a string and place it in a buffer
2644 * @buf: The buffer to place the result into
2645 * @size: The size of the buffer, including the trailing null space
2646 * @fmt: The format string to use
2647 * @...: Arguments for the format string
2648 *
2649 * The return value is the number of characters written into @buf not including
b903c0b8 2650 * the trailing '\0'. If @size is == 0 the function returns 0.
1da177e4
LT		 2651 */
2652
7b9186f5 2653int scnprintf(char *buf, size_t size, const char *fmt, ...)
1da177e4
LT		 2654{
2655 va_list args;
2656 int i;
2657
2658 va_start(args, fmt);
b921c69f 2659 i = vscnprintf(buf, size, fmt, args);
1da177e4 2660 va_end(args);
7b9186f5 2661
b921c69f 2662 return i;
1da177e4
LT		 2663}
2664EXPORT_SYMBOL(scnprintf);
2665
2666/**
2667 * vsprintf - Format a string and place it in a buffer
2668 * @buf: The buffer to place the result into
2669 * @fmt: The format string to use
2670 * @args: Arguments for the format string
2671 *
2672 * The function returns the number of characters written
72fd4a35 2673 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
1da177e4
LT		 2674 * buffer overflows.
2675 *
ba1835eb 2676 * If you're not already dealing with a va_list consider using sprintf().
20036fdc
AK		 2677 *
2678 * See the vsnprintf() documentation for format string extensions over C99.
1da177e4
LT		 2679 */
2680int vsprintf(char *buf, const char *fmt, va_list args)
2681{
2682 return vsnprintf(buf, INT_MAX, fmt, args);
2683}
1da177e4
LT		 2684EXPORT_SYMBOL(vsprintf);
2685
2686/**
2687 * sprintf - Format a string and place it in a buffer
2688 * @buf: The buffer to place the result into
2689 * @fmt: The format string to use
2690 * @...: Arguments for the format string
2691 *
2692 * The function returns the number of characters written
72fd4a35 2693 * into @buf. Use snprintf() or scnprintf() in order to avoid
1da177e4 2694 * buffer overflows.
20036fdc
AK		 2695 *
2696 * See the vsnprintf() documentation for format string extensions over C99.
1da177e4 2697 */
7b9186f5 2698int sprintf(char *buf, const char *fmt, ...)
1da177e4
LT		 2699{
2700 va_list args;
2701 int i;
2702
2703 va_start(args, fmt);
7b9186f5 2704 i = vsnprintf(buf, INT_MAX, fmt, args);
1da177e4 2705 va_end(args);
7b9186f5 2706
1da177e4
LT		 2707 return i;
2708}
1da177e4
LT		 2709EXPORT_SYMBOL(sprintf);
2710
4370aa4a
LJ		 2711#ifdef CONFIG_BINARY_PRINTF
2712/*
2713 * bprintf service:
2714 * vbin_printf() - VA arguments to binary data
2715 * bstr_printf() - Binary data to text string
2716 */
2717
2718/**
2719 * vbin_printf - Parse a format string and place args' binary value in a buffer
2720 * @bin_buf: The buffer to place args' binary value
2721 * @size: The size of the buffer(by words(32bits), not characters)
2722 * @fmt: The format string to use
2723 * @args: Arguments for the format string
2724 *
2725 * The format follows C99 vsnprintf, except %n is ignored, and its argument
da3dae54 2726 * is skipped.
4370aa4a
LJ		 2727 *
2728 * The return value is the number of words(32bits) which would be generated for
2729 * the given input.
2730 *
2731 * NOTE:
2732 * If the return value is greater than @size, the resulting bin_buf is NOT
2733 * valid for bstr_printf().
2734 */
2735int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
2736{
fef20d9c 2737 struct printf_spec spec = {0};
4370aa4a 2738 char *str, *end;
841a915d 2739 int width;
4370aa4a
LJ		 2740
2741 str = (char *)bin_buf;
2742 end = (char *)(bin_buf + size);
2743
2744#define save_arg(type) \
841a915d
SRV		 2745({ \
2746 unsigned long long value; \
4370aa4a 2747 if (sizeof(type) == 8) { \
841a915d 2748 unsigned long long val8; \
4370aa4a 2749 str = PTR_ALIGN(str, sizeof(u32)); \
841a915d 2750 val8 = va_arg(args, unsigned long long); \
4370aa4a 2751 if (str + sizeof(type) <= end) { \
841a915d
SRV		 2752 *(u32 *)str = *(u32 *)&val8; \
2753 *(u32 *)(str + 4) = *((u32 *)&val8 + 1); \
4370aa4a 2754 } \
841a915d 2755 value = val8; \
4370aa4a 2756 } else { \
841a915d 2757 unsigned int val4; \
4370aa4a 2758 str = PTR_ALIGN(str, sizeof(type)); \
841a915d 2759 val4 = va_arg(args, int); \
4370aa4a 2760 if (str + sizeof(type) <= end) \
841a915d
SRV		 2761 *(typeof(type) *)str = (type)(long)val4; \
2762 value = (unsigned long long)val4; \
4370aa4a
LJ		 2763 } \
2764 str += sizeof(type); \
841a915d
SRV		 2765 value; \
2766})
4370aa4a 2767
fef20d9c 2768 while (*fmt) {
d4be151b 2769 int read = format_decode(fmt, &spec);
4370aa4a 2770
fef20d9c 2771 fmt += read;
4370aa4a 2772
fef20d9c
FW		 2773 switch (spec.type) {
2774 case FORMAT_TYPE_NONE:
d4be151b 2775 case FORMAT_TYPE_PERCENT_CHAR:
fef20d9c 2776 break;
b006f19b
RV		 2777 case FORMAT_TYPE_INVALID:
2778 goto out;
fef20d9c 2779
ed681a91 2780 case FORMAT_TYPE_WIDTH:
fef20d9c 2781 case FORMAT_TYPE_PRECISION:
841a915d
SRV		 2782 width = (int)save_arg(int);
2783 /* Pointers may require the width */
2784 if (*fmt == 'p')
2785 set_field_width(&spec, width);
fef20d9c
FW		 2786 break;
2787
2788 case FORMAT_TYPE_CHAR:
4370aa4a 2789 save_arg(char);
fef20d9c
FW		 2790 break;
2791
2792 case FORMAT_TYPE_STR: {
4370aa4a 2793 const char *save_str = va_arg(args, char *);
3e5903eb 2794 const char *err_msg;
4370aa4a 2795 size_t len;
6c356634 2796
3e5903eb
PM		 2797 err_msg = check_pointer_msg(save_str);
2798 if (err_msg)
2799 save_str = err_msg;
2800
6c356634
AGR		 2801 len = strlen(save_str) + 1;
2802 if (str + len < end)
2803 memcpy(str, save_str, len);
2804 str += len;
fef20d9c 2805 break;
4370aa4a 2806 }
fef20d9c
FW		 2807
2808 case FORMAT_TYPE_PTR:
841a915d
SRV		 2809 /* Dereferenced pointers must be done now */
2810 switch (*fmt) {
2811 /* Dereference of functions is still OK */
2812 case 'S':
2813 case 's':
2814 case 'F':
2815 case 'f':
1e6338cf
SRV		 2816 case 'x':
2817 case 'K':
841a915d
SRV		 2818 save_arg(void *);
2819 break;
2820 default:
2821 if (!isalnum(*fmt)) {
2822 save_arg(void *);
2823 break;
2824 }
2825 str = pointer(fmt, str, end, va_arg(args, void *),
2826 spec);
2827 if (str + 1 < end)
2828 *str++ = '\0';
2829 else
2830 end[-1] = '\0'; /* Must be nul terminated */
2831 }
4370aa4a 2832 /* skip all alphanumeric pointer suffixes */
fef20d9c 2833 while (isalnum(*fmt))
4370aa4a 2834 fmt++;
fef20d9c
FW		 2835 break;
2836
fef20d9c
FW		 2837 default:
2838 switch (spec.type) {
2839
2840 case FORMAT_TYPE_LONG_LONG:
4370aa4a 2841 save_arg(long long);
fef20d9c
FW		 2842 break;
2843 case FORMAT_TYPE_ULONG:
2844 case FORMAT_TYPE_LONG:
4370aa4a 2845 save_arg(unsigned long);
fef20d9c
FW		 2846 break;
2847 case FORMAT_TYPE_SIZE_T:
4370aa4a 2848 save_arg(size_t);
fef20d9c
FW		 2849 break;
2850 case FORMAT_TYPE_PTRDIFF:
4370aa4a 2851 save_arg(ptrdiff_t);
fef20d9c 2852 break;
a4e94ef0
Z		 2853 case FORMAT_TYPE_UBYTE:
2854 case FORMAT_TYPE_BYTE:
2855 save_arg(char);
2856 break;
fef20d9c
FW		 2857 case FORMAT_TYPE_USHORT:
2858 case FORMAT_TYPE_SHORT:
4370aa4a 2859 save_arg(short);
fef20d9c
FW		 2860 break;
2861 default:
4370aa4a 2862 save_arg(int);
fef20d9c 2863 }
4370aa4a
LJ		 2864 }
2865 }
fef20d9c 2866
b006f19b 2867out:
7b9186f5 2868 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
fef20d9c 2869#undef save_arg
4370aa4a
LJ		 2870}
2871EXPORT_SYMBOL_GPL(vbin_printf);
2872
2873/**
2874 * bstr_printf - Format a string from binary arguments and place it in a buffer
2875 * @buf: The buffer to place the result into
2876 * @size: The size of the buffer, including the trailing null space
2877 * @fmt: The format string to use
2878 * @bin_buf: Binary arguments for the format string
2879 *
2880 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
2881 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
2882 * a binary buffer that generated by vbin_printf.
2883 *
2884 * The format follows C99 vsnprintf, but has some extensions:
0efb4d20 2885 * see vsnprintf comment for details.
4370aa4a
LJ		 2886 *
2887 * The return value is the number of characters which would
2888 * be generated for the given input, excluding the trailing
2889 * '\0', as per ISO C99. If you want to have the exact
2890 * number of characters written into @buf as return value
2891 * (not including the trailing '\0'), use vscnprintf(). If the
2892 * return is greater than or equal to @size, the resulting
2893 * string is truncated.
2894 */
2895int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
2896{
fef20d9c 2897 struct printf_spec spec = {0};
d4be151b
AGR		 2898 char *str, *end;
2899 const char *args = (const char *)bin_buf;
4370aa4a 2900
762abb51 2901 if (WARN_ON_ONCE(size > INT_MAX))
4370aa4a 2902 return 0;
4370aa4a
LJ		 2903
2904 str = buf;
2905 end = buf + size;
2906
2907#define get_arg(type) \
2908({ \
2909 typeof(type) value; \
2910 if (sizeof(type) == 8) { \
2911 args = PTR_ALIGN(args, sizeof(u32)); \
2912 *(u32 *)&value = *(u32 *)args; \
2913 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
2914 } else { \
2915 args = PTR_ALIGN(args, sizeof(type)); \
2916 value = *(typeof(type) *)args; \
2917 } \
2918 args += sizeof(type); \
2919 value; \
2920})
2921
2922 /* Make sure end is always >= buf */
2923 if (end < buf) {
2924 end = ((void *)-1);
2925 size = end - buf;
2926 }
2927
fef20d9c 2928 while (*fmt) {
fef20d9c 2929 const char *old_fmt = fmt;
d4be151b 2930 int read = format_decode(fmt, &spec);
4370aa4a 2931
fef20d9c 2932 fmt += read;
4370aa4a 2933
fef20d9c
FW		 2934 switch (spec.type) {
2935 case FORMAT_TYPE_NONE: {
2936 int copy = read;
2937 if (str < end) {
2938 if (copy > end - str)
2939 copy = end - str;
2940 memcpy(str, old_fmt, copy);
4370aa4a 2941 }
fef20d9c
FW		 2942 str += read;
2943 break;
4370aa4a
LJ		 2944 }
2945
ed681a91 2946 case FORMAT_TYPE_WIDTH:
4d72ba01 2947 set_field_width(&spec, get_arg(int));
fef20d9c 2948 break;
4370aa4a 2949
fef20d9c 2950 case FORMAT_TYPE_PRECISION:
4d72ba01 2951 set_precision(&spec, get_arg(int));
fef20d9c 2952 break;
4370aa4a 2953
d4be151b
AGR		 2954 case FORMAT_TYPE_CHAR: {
2955 char c;
2956
fef20d9c
FW		 2957 if (!(spec.flags & LEFT)) {
2958 while (--spec.field_width > 0) {
4370aa4a
LJ		 2959 if (str < end)
2960 *str = ' ';
2961 ++str;
2962 }
2963 }
2964 c = (unsigned char) get_arg(char);
2965 if (str < end)
2966 *str = c;
2967 ++str;
fef20d9c 2968 while (--spec.field_width > 0) {
4370aa4a
LJ		 2969 if (str < end)
2970 *str = ' ';
2971 ++str;
2972 }
fef20d9c 2973 break;
d4be151b 2974 }
4370aa4a 2975
fef20d9c 2976 case FORMAT_TYPE_STR: {
4370aa4a 2977 const char *str_arg = args;
d4be151b 2978 args += strlen(str_arg) + 1;
fef20d9c
FW		 2979 str = string(str, end, (char *)str_arg, spec);
2980 break;
4370aa4a
LJ		 2981 }
2982
841a915d
SRV		 2983 case FORMAT_TYPE_PTR: {
2984 bool process = false;
2985 int copy, len;
2986 /* Non function dereferences were already done */
2987 switch (*fmt) {
2988 case 'S':
2989 case 's':
2990 case 'F':
2991 case 'f':
1e6338cf
SRV		 2992 case 'x':
2993 case 'K':
841a915d
SRV		 2994 process = true;
2995 break;
2996 default:
2997 if (!isalnum(*fmt)) {
2998 process = true;
2999 break;
3000 }
3001 /* Pointer dereference was already processed */
3002 if (str < end) {
3003 len = copy = strlen(args);
3004 if (copy > end - str)
3005 copy = end - str;
3006 memcpy(str, args, copy);
3007 str += len;
62165600 3008 args += len + 1;
841a915d
SRV		 3009 }
3010 }
3011 if (process)
3012 str = pointer(fmt, str, end, get_arg(void *), spec);
3013
fef20d9c 3014 while (isalnum(*fmt))
4370aa4a 3015 fmt++;
fef20d9c 3016 break;
841a915d 3017 }
4370aa4a 3018
fef20d9c 3019 case FORMAT_TYPE_PERCENT_CHAR:
4370aa4a
LJ		 3020 if (str < end)
3021 *str = '%';
3022 ++str;
fef20d9c
FW		 3023 break;
3024
b006f19b
RV		 3025 case FORMAT_TYPE_INVALID:
3026 goto out;
3027
d4be151b
AGR		 3028 default: {
3029 unsigned long long num;
3030
fef20d9c
FW		 3031 switch (spec.type) {
3032
3033 case FORMAT_TYPE_LONG_LONG:
3034 num = get_arg(long long);
3035 break;
3036 case FORMAT_TYPE_ULONG:
fef20d9c
FW		 3037 case FORMAT_TYPE_LONG:
3038 num = get_arg(unsigned long);
3039 break;
3040 case FORMAT_TYPE_SIZE_T:
3041 num = get_arg(size_t);
3042 break;
3043 case FORMAT_TYPE_PTRDIFF:
3044 num = get_arg(ptrdiff_t);
3045 break;
a4e94ef0
Z		 3046 case FORMAT_TYPE_UBYTE:
3047 num = get_arg(unsigned char);
3048 break;
3049 case FORMAT_TYPE_BYTE:
3050 num = get_arg(signed char);
3051 break;
fef20d9c
FW		 3052 case FORMAT_TYPE_USHORT:
3053 num = get_arg(unsigned short);
3054 break;
3055 case FORMAT_TYPE_SHORT:
3056 num = get_arg(short);
3057 break;
3058 case FORMAT_TYPE_UINT:
3059 num = get_arg(unsigned int);
3060 break;
3061 default:
3062 num = get_arg(int);
3063 }
3064
3065 str = number(str, end, num, spec);
d4be151b
AGR		 3066 } /* default: */
3067 } /* switch(spec.type) */
3068 } /* while(*fmt) */
fef20d9c 3069
b006f19b 3070out:
4370aa4a
LJ		 3071 if (size > 0) {
3072 if (str < end)
3073 *str = '\0';
3074 else
3075 end[-1] = '\0';
3076 }
fef20d9c 3077
4370aa4a
LJ		 3078#undef get_arg
3079
3080 /* the trailing null byte doesn't count towards the total */
3081 return str - buf;
3082}
3083EXPORT_SYMBOL_GPL(bstr_printf);
3084
3085/**
3086 * bprintf - Parse a format string and place args' binary value in a buffer
3087 * @bin_buf: The buffer to place args' binary value
3088 * @size: The size of the buffer(by words(32bits), not characters)
3089 * @fmt: The format string to use
3090 * @...: Arguments for the format string
3091 *
3092 * The function returns the number of words(u32) written
3093 * into @bin_buf.
3094 */
3095int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
3096{
3097 va_list args;
3098 int ret;
3099
3100 va_start(args, fmt);
3101 ret = vbin_printf(bin_buf, size, fmt, args);
3102 va_end(args);
7b9186f5 3103
4370aa4a
LJ		 3104 return ret;
3105}
3106EXPORT_SYMBOL_GPL(bprintf);
3107
3108#endif /* CONFIG_BINARY_PRINTF */
3109
1da177e4
LT		 3110/**
3111 * vsscanf - Unformat a buffer into a list of arguments
3112 * @buf: input buffer
3113 * @fmt: format of buffer
3114 * @args: arguments
3115 */
7b9186f5 3116int vsscanf(const char *buf, const char *fmt, va_list args)
1da177e4
LT		 3117{
3118 const char *str = buf;
3119 char *next;
3120 char digit;
3121 int num = 0;
ef0658f3 3122 u8 qualifier;
53809751
JB		 3123 unsigned int base;
3124 union {
3125 long long s;
3126 unsigned long long u;
3127 } val;
ef0658f3 3128 s16 field_width;
d4be151b 3129 bool is_sign;
1da177e4 3130
da99075c 3131 while (*fmt) {
1da177e4
LT		 3132 /* skip any white space in format */
3133 /* white space in format matchs any amount of
3134 * white space, including none, in the input.
3135 */
3136 if (isspace(*fmt)) {
e7d2860b
AGR		 3137 fmt = skip_spaces(++fmt);
3138 str = skip_spaces(str);
1da177e4
LT		 3139 }
3140
3141 /* anything that is not a conversion must match exactly */
3142 if (*fmt != '%' && *fmt) {
3143 if (*fmt++ != *str++)
3144 break;
3145 continue;
3146 }
3147
3148 if (!*fmt)
3149 break;
3150 ++fmt;
7b9186f5 3151
1da177e4
LT		 3152 /* skip this conversion.
3153 * advance both strings to next white space
3154 */
3155 if (*fmt == '*') {
da99075c
JB		 3156 if (!*str)
3157 break;
f9310b2f
JY		 3158 while (!isspace(*fmt) && *fmt != '%' && *fmt) {
3159 /* '%*[' not yet supported, invalid format */
3160 if (*fmt == '[')
3161 return num;
1da177e4 3162 fmt++;
f9310b2f 3163 }
1da177e4
LT		 3164 while (!isspace(*str) && *str)
3165 str++;
3166 continue;
3167 }
3168
3169 /* get field width */
3170 field_width = -1;
53809751 3171 if (isdigit(*fmt)) {
1da177e4 3172 field_width = skip_atoi(&fmt);
53809751
JB		 3173 if (field_width <= 0)
3174 break;
3175 }
1da177e4
LT		 3176
3177 /* get conversion qualifier */
3178 qualifier = -1;
75fb8f26 3179 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
5b5e0928 3180 *fmt == 'z') {
1da177e4
LT		 3181 qualifier = *fmt++;
3182 if (unlikely(qualifier == *fmt)) {
3183 if (qualifier == 'h') {
3184 qualifier = 'H';
3185 fmt++;
3186 } else if (qualifier == 'l') {
3187 qualifier = 'L';
3188 fmt++;
3189 }
3190 }
3191 }
1da177e4 3192
da99075c
JB		 3193 if (!*fmt)
3194 break;
3195
3196 if (*fmt == 'n') {
3197 /* return number of characters read so far */
3198 *va_arg(args, int *) = str - buf;
3199 ++fmt;
3200 continue;
3201 }
3202
3203 if (!*str)
1da177e4
LT		 3204 break;
3205
d4be151b 3206 base = 10;
3f623eba 3207 is_sign = false;
d4be151b 3208
7b9186f5 3209 switch (*fmt++) {
1da177e4
LT		 3210 case 'c':
3211 {
7b9186f5 3212 char *s = (char *)va_arg(args, char*);
1da177e4
LT		 3213 if (field_width == -1)
3214 field_width = 1;
3215 do {
3216 *s++ = *str++;
3217 } while (--field_width > 0 && *str);
3218 num++;
3219 }
3220 continue;
3221 case 's':
3222 {
7b9186f5
AGR		 3223 char *s = (char *)va_arg(args, char *);
3224 if (field_width == -1)
4be929be 3225 field_width = SHRT_MAX;
1da177e4 3226 /* first, skip leading white space in buffer */
e7d2860b 3227 str = skip_spaces(str);
1da177e4
LT		 3228
3229 /* now copy until next white space */
7b9186f5 3230 while (*str && !isspace(*str) && field_width--)
1da177e4 3231 *s++ = *str++;
1da177e4
LT		 3232 *s = '\0';
3233 num++;
3234 }
3235 continue;
f9310b2f
JY		 3236 /*
3237 * Warning: This implementation of the '[' conversion specifier
3238 * deviates from its glibc counterpart in the following ways:
3239 * (1) It does NOT support ranges i.e. '-' is NOT a special
3240 * character
3241 * (2) It cannot match the closing bracket ']' itself
3242 * (3) A field width is required
3243 * (4) '%*[' (discard matching input) is currently not supported
3244 *
3245 * Example usage:
3246 * ret = sscanf("00:0a:95","%2[^:]:%2[^:]:%2[^:]",
3247 * buf1, buf2, buf3);
3248 * if (ret < 3)
3249 * // etc..
3250 */
3251 case '[':
3252 {
3253 char *s = (char *)va_arg(args, char *);
3254 DECLARE_BITMAP(set, 256) = {0};
3255 unsigned int len = 0;
3256 bool negate = (*fmt == '^');
3257
3258 /* field width is required */
3259 if (field_width == -1)
3260 return num;
3261
3262 if (negate)
3263 ++fmt;
3264
3265 for ( ; *fmt && *fmt != ']'; ++fmt, ++len)
3266 set_bit((u8)*fmt, set);
3267
3268 /* no ']' or no character set found */
3269 if (!*fmt || !len)
3270 return num;
3271 ++fmt;
3272
3273 if (negate) {
3274 bitmap_complement(set, set, 256);
3275 /* exclude null '\0' byte */
3276 clear_bit(0, set);
3277 }
3278
3279 /* match must be non-empty */
3280 if (!test_bit((u8)*str, set))
3281 return num;
3282
3283 while (test_bit((u8)*str, set) && field_width--)
3284 *s++ = *str++;
3285 *s = '\0';
3286 ++num;
3287 }
3288 continue;
1da177e4
LT		 3289 case 'o':
3290 base = 8;
3291 break;
3292 case 'x':
3293 case 'X':
3294 base = 16;
3295 break;
3296 case 'i':
7b9186f5 3297 base = 0;
7e6bd6f3 3298 /* fall through */
1da177e4 3299 case 'd':
3f623eba 3300 is_sign = true;
7e6bd6f3 3301 /* fall through */
1da177e4
LT		 3302 case 'u':
3303 break;
3304 case '%':
3305 /* looking for '%' in str */
7b9186f5 3306 if (*str++ != '%')
1da177e4
LT		 3307 return num;
3308 continue;
3309 default:
3310 /* invalid format; stop here */
3311 return num;
3312 }
3313
3314 /* have some sort of integer conversion.
3315 * first, skip white space in buffer.
3316 */
e7d2860b 3317 str = skip_spaces(str);
1da177e4
LT		 3318
3319 digit = *str;
3320 if (is_sign && digit == '-')
3321 digit = *(str + 1);
3322
3323 if (!digit
7b9186f5
AGR		 3324 || (base == 16 && !isxdigit(digit))
3325 || (base == 10 && !isdigit(digit))
3326 || (base == 8 && (!isdigit(digit) || digit > '7'))
3327 || (base == 0 && !isdigit(digit)))
3328 break;
1da177e4 3329
53809751
JB		 3330 if (is_sign)
3331 val.s = qualifier != 'L' ?
3332 simple_strtol(str, &next, base) :
3333 simple_strtoll(str, &next, base);
3334 else
3335 val.u = qualifier != 'L' ?
3336 simple_strtoul(str, &next, base) :
3337 simple_strtoull(str, &next, base);
3338
3339 if (field_width > 0 && next - str > field_width) {
3340 if (base == 0)
3341 _parse_integer_fixup_radix(str, &base);
3342 while (next - str > field_width) {
3343 if (is_sign)
3344 val.s = div_s64(val.s, base);
3345 else
3346 val.u = div_u64(val.u, base);
3347 --next;
3348 }
3349 }
3350
7b9186f5 3351 switch (qualifier) {
1da177e4 3352 case 'H': /* that's 'hh' in format */
53809751
JB		 3353 if (is_sign)
3354 *va_arg(args, signed char *) = val.s;
3355 else
3356 *va_arg(args, unsigned char *) = val.u;
1da177e4
LT		 3357 break;
3358 case 'h':
53809751
JB		 3359 if (is_sign)
3360 *va_arg(args, short *) = val.s;
3361 else
3362 *va_arg(args, unsigned short *) = val.u;
1da177e4
LT		 3363 break;
3364 case 'l':
53809751
JB		 3365 if (is_sign)
3366 *va_arg(args, long *) = val.s;
3367 else
3368 *va_arg(args, unsigned long *) = val.u;
1da177e4
LT		 3369 break;
3370 case 'L':
53809751
JB		 3371 if (is_sign)
3372 *va_arg(args, long long *) = val.s;
3373 else
3374 *va_arg(args, unsigned long long *) = val.u;
1da177e4 3375 break;
1da177e4 3376 case 'z':
53809751
JB		 3377 *va_arg(args, size_t *) = val.u;
3378 break;
1da177e4 3379 default:
53809751
JB		 3380 if (is_sign)
3381 *va_arg(args, int *) = val.s;
3382 else
3383 *va_arg(args, unsigned int *) = val.u;
1da177e4
LT		 3384 break;
3385 }
3386 num++;
3387
3388 if (!next)
3389 break;
3390 str = next;
3391 }
c6b40d16 3392
1da177e4
LT		 3393 return num;
3394}
1da177e4
LT		 3395EXPORT_SYMBOL(vsscanf);
3396
3397/**
3398 * sscanf - Unformat a buffer into a list of arguments
3399 * @buf: input buffer
3400 * @fmt: formatting of buffer
3401 * @...: resulting arguments
3402 */
7b9186f5 3403int sscanf(const char *buf, const char *fmt, ...)
1da177e4
LT		 3404{
3405 va_list args;
3406 int i;
3407
7b9186f5
AGR		 3408 va_start(args, fmt);
3409 i = vsscanf(buf, fmt, args);
1da177e4 3410 va_end(args);
7b9186f5 3411
1da177e4
LT		 3412 return i;
3413}
1da177e4 3414EXPORT_SYMBOL(sscanf);
Linux 6.x block layer and io_uring tree(s)