1 /* 2 * linux/lib/vsprintf.c 3 * 4 * Copyright (C) 1991, 1992 Linus Torvalds 5 */ 6 7 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */ 8 /* 9 * Wirzenius wrote this portably, Torvalds fucked it up :-) 10 */ 11 12 /* 13 * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com> 14 * - changed to provide snprintf and vsnprintf functions 15 * So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de> 16 * - scnprintf and vscnprintf 17 */ 18 19 #include <stdarg.h> 20 #include <linux/module.h> /* for KSYM_SYMBOL_LEN */ 21 #include <linux/types.h> 22 #include <linux/string.h> 23 #include <linux/ctype.h> 24 #include <linux/kernel.h> 25 #include <linux/kallsyms.h> 26 #include <linux/math64.h> 27 #include <linux/uaccess.h> 28 #include <linux/ioport.h> 29 #include <linux/dcache.h> 30 #include <linux/cred.h> 31 #include <net/addrconf.h> 32 33 #include <asm/page.h> /* for PAGE_SIZE */ 34 #include <asm/sections.h> /* for dereference_function_descriptor() */ 35 36 #include <linux/string_helpers.h> 37 #include "kstrtox.h" 38 39 /** 40 * simple_strtoull - convert a string to an unsigned long long 41 * @cp: The start of the string 42 * @endp: A pointer to the end of the parsed string will be placed here 43 * @base: The number base to use 44 * 45 * This function is obsolete. Please use kstrtoull instead. 46 */ 47 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) 48 { 49 unsigned long long result; 50 unsigned int rv; 51 52 cp = _parse_integer_fixup_radix(cp, &base); 53 rv = _parse_integer(cp, base, &result); 54 /* FIXME */ 55 cp += (rv & ~KSTRTOX_OVERFLOW); 56 57 if (endp) 58 *endp = (char *)cp; 59 60 return result; 61 } 62 EXPORT_SYMBOL(simple_strtoull); 63 64 /** 65 * simple_strtoul - convert a string to an unsigned long 66 * @cp: The start of the string 67 * @endp: A pointer to the end of the parsed string will be placed here 68 * @base: The number base to use 69 * 70 * This function is obsolete. Please use kstrtoul instead. 71 */ 72 unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) 73 { 74 return simple_strtoull(cp, endp, base); 75 } 76 EXPORT_SYMBOL(simple_strtoul); 77 78 /** 79 * simple_strtol - convert a string to a signed long 80 * @cp: The start of the string 81 * @endp: A pointer to the end of the parsed string will be placed here 82 * @base: The number base to use 83 * 84 * This function is obsolete. Please use kstrtol instead. 85 */ 86 long simple_strtol(const char *cp, char **endp, unsigned int base) 87 { 88 if (*cp == '-') 89 return -simple_strtoul(cp + 1, endp, base); 90 91 return simple_strtoul(cp, endp, base); 92 } 93 EXPORT_SYMBOL(simple_strtol); 94 95 /** 96 * simple_strtoll - convert a string to a signed long long 97 * @cp: The start of the string 98 * @endp: A pointer to the end of the parsed string will be placed here 99 * @base: The number base to use 100 * 101 * This function is obsolete. Please use kstrtoll instead. 102 */ 103 long long simple_strtoll(const char *cp, char **endp, unsigned int base) 104 { 105 if (*cp == '-') 106 return -simple_strtoull(cp + 1, endp, base); 107 108 return simple_strtoull(cp, endp, base); 109 } 110 EXPORT_SYMBOL(simple_strtoll); 111 112 static noinline_for_stack 113 int skip_atoi(const char **s) 114 { 115 int i = 0; 116 117 while (isdigit(**s)) 118 i = i*10 + *((*s)++) - '0'; 119 120 return i; 121 } 122 123 /* Decimal conversion is by far the most typical, and is used 124 * for /proc and /sys data. This directly impacts e.g. top performance 125 * with many processes running. We optimize it for speed 126 * using ideas described at <http://www.cs.uiowa.edu/~jones/bcd/divide.html> 127 * (with permission from the author, Douglas W. Jones). 128 */ 129 130 #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64 131 /* Formats correctly any integer in [0, 999999999] */ 132 static noinline_for_stack 133 char *put_dec_full9(char *buf, unsigned q) 134 { 135 unsigned r; 136 137 /* 138 * Possible ways to approx. divide by 10 139 * (x * 0x1999999a) >> 32 x < 1073741829 (multiply must be 64-bit) 140 * (x * 0xcccd) >> 19 x < 81920 (x < 262149 when 64-bit mul) 141 * (x * 0x6667) >> 18 x < 43699 142 * (x * 0x3334) >> 17 x < 16389 143 * (x * 0x199a) >> 16 x < 16389 144 * (x * 0x0ccd) >> 15 x < 16389 145 * (x * 0x0667) >> 14 x < 2739 146 * (x * 0x0334) >> 13 x < 1029 147 * (x * 0x019a) >> 12 x < 1029 148 * (x * 0x00cd) >> 11 x < 1029 shorter code than * 0x67 (on i386) 149 * (x * 0x0067) >> 10 x < 179 150 * (x * 0x0034) >> 9 x < 69 same 151 * (x * 0x001a) >> 8 x < 69 same 152 * (x * 0x000d) >> 7 x < 69 same, shortest code (on i386) 153 * (x * 0x0007) >> 6 x < 19 154 * See <http://www.cs.uiowa.edu/~jones/bcd/divide.html> 155 */ 156 r = (q * (uint64_t)0x1999999a) >> 32; 157 *buf++ = (q - 10 * r) + '0'; /* 1 */ 158 q = (r * (uint64_t)0x1999999a) >> 32; 159 *buf++ = (r - 10 * q) + '0'; /* 2 */ 160 r = (q * (uint64_t)0x1999999a) >> 32; 161 *buf++ = (q - 10 * r) + '0'; /* 3 */ 162 q = (r * (uint64_t)0x1999999a) >> 32; 163 *buf++ = (r - 10 * q) + '0'; /* 4 */ 164 r = (q * (uint64_t)0x1999999a) >> 32; 165 *buf++ = (q - 10 * r) + '0'; /* 5 */ 166 /* Now value is under 10000, can avoid 64-bit multiply */ 167 q = (r * 0x199a) >> 16; 168 *buf++ = (r - 10 * q) + '0'; /* 6 */ 169 r = (q * 0xcd) >> 11; 170 *buf++ = (q - 10 * r) + '0'; /* 7 */ 171 q = (r * 0xcd) >> 11; 172 *buf++ = (r - 10 * q) + '0'; /* 8 */ 173 *buf++ = q + '0'; /* 9 */ 174 return buf; 175 } 176 #endif 177 178 /* Similar to above but do not pad with zeros. 179 * Code can be easily arranged to print 9 digits too, but our callers 180 * always call put_dec_full9() instead when the number has 9 decimal digits. 181 */ 182 static noinline_for_stack 183 char *put_dec_trunc8(char *buf, unsigned r) 184 { 185 unsigned q; 186 187 /* Copy of previous function's body with added early returns */ 188 while (r >= 10000) { 189 q = r + '0'; 190 r = (r * (uint64_t)0x1999999a) >> 32; 191 *buf++ = q - 10*r; 192 } 193 194 q = (r * 0x199a) >> 16; /* r <= 9999 */ 195 *buf++ = (r - 10 * q) + '0'; 196 if (q == 0) 197 return buf; 198 r = (q * 0xcd) >> 11; /* q <= 999 */ 199 *buf++ = (q - 10 * r) + '0'; 200 if (r == 0) 201 return buf; 202 q = (r * 0xcd) >> 11; /* r <= 99 */ 203 *buf++ = (r - 10 * q) + '0'; 204 if (q == 0) 205 return buf; 206 *buf++ = q + '0'; /* q <= 9 */ 207 return buf; 208 } 209 210 /* There are two algorithms to print larger numbers. 211 * One is generic: divide by 1000000000 and repeatedly print 212 * groups of (up to) 9 digits. It's conceptually simple, 213 * but requires a (unsigned long long) / 1000000000 division. 214 * 215 * Second algorithm splits 64-bit unsigned long long into 16-bit chunks, 216 * manipulates them cleverly and generates groups of 4 decimal digits. 217 * It so happens that it does NOT require long long division. 218 * 219 * If long is > 32 bits, division of 64-bit values is relatively easy, 220 * and we will use the first algorithm. 221 * If long long is > 64 bits (strange architecture with VERY large long long), 222 * second algorithm can't be used, and we again use the first one. 223 * 224 * Else (if long is 32 bits and long long is 64 bits) we use second one. 225 */ 226 227 #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64 228 229 /* First algorithm: generic */ 230 231 static 232 char *put_dec(char *buf, unsigned long long n) 233 { 234 if (n >= 100*1000*1000) { 235 while (n >= 1000*1000*1000) 236 buf = put_dec_full9(buf, do_div(n, 1000*1000*1000)); 237 if (n >= 100*1000*1000) 238 return put_dec_full9(buf, n); 239 } 240 return put_dec_trunc8(buf, n); 241 } 242 243 #else 244 245 /* Second algorithm: valid only for 64-bit long longs */ 246 247 /* See comment in put_dec_full9 for choice of constants */ 248 static noinline_for_stack 249 void put_dec_full4(char *buf, unsigned q) 250 { 251 unsigned r; 252 r = (q * 0xccd) >> 15; 253 buf[0] = (q - 10 * r) + '0'; 254 q = (r * 0xcd) >> 11; 255 buf[1] = (r - 10 * q) + '0'; 256 r = (q * 0xcd) >> 11; 257 buf[2] = (q - 10 * r) + '0'; 258 buf[3] = r + '0'; 259 } 260 261 /* 262 * Call put_dec_full4 on x % 10000, return x / 10000. 263 * The approximation x/10000 == (x * 0x346DC5D7) >> 43 264 * holds for all x < 1,128,869,999. The largest value this 265 * helper will ever be asked to convert is 1,125,520,955. 266 * (d1 in the put_dec code, assuming n is all-ones). 267 */ 268 static 269 unsigned put_dec_helper4(char *buf, unsigned x) 270 { 271 uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43; 272 273 put_dec_full4(buf, x - q * 10000); 274 return q; 275 } 276 277 /* Based on code by Douglas W. Jones found at 278 * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour> 279 * (with permission from the author). 280 * Performs no 64-bit division and hence should be fast on 32-bit machines. 281 */ 282 static 283 char *put_dec(char *buf, unsigned long long n) 284 { 285 uint32_t d3, d2, d1, q, h; 286 287 if (n < 100*1000*1000) 288 return put_dec_trunc8(buf, n); 289 290 d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */ 291 h = (n >> 32); 292 d2 = (h ) & 0xffff; 293 d3 = (h >> 16); /* implicit "& 0xffff" */ 294 295 q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff); 296 q = put_dec_helper4(buf, q); 297 298 q += 7671 * d3 + 9496 * d2 + 6 * d1; 299 q = put_dec_helper4(buf+4, q); 300 301 q += 4749 * d3 + 42 * d2; 302 q = put_dec_helper4(buf+8, q); 303 304 q += 281 * d3; 305 buf += 12; 306 if (q) 307 buf = put_dec_trunc8(buf, q); 308 else while (buf[-1] == '0') 309 --buf; 310 311 return buf; 312 } 313 314 #endif 315 316 /* 317 * Convert passed number to decimal string. 318 * Returns the length of string. On buffer overflow, returns 0. 319 * 320 * If speed is not important, use snprintf(). It's easy to read the code. 321 */ 322 int num_to_str(char *buf, int size, unsigned long long num) 323 { 324 char tmp[sizeof(num) * 3]; 325 int idx, len; 326 327 /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */ 328 if (num <= 9) { 329 tmp[0] = '0' + num; 330 len = 1; 331 } else { 332 len = put_dec(tmp, num) - tmp; 333 } 334 335 if (len > size) 336 return 0; 337 for (idx = 0; idx < len; ++idx) 338 buf[idx] = tmp[len - idx - 1]; 339 return len; 340 } 341 342 #define ZEROPAD 1 /* pad with zero */ 343 #define SIGN 2 /* unsigned/signed long */ 344 #define PLUS 4 /* show plus */ 345 #define SPACE 8 /* space if plus */ 346 #define LEFT 16 /* left justified */ 347 #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ 348 #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ 349 350 enum format_type { 351 FORMAT_TYPE_NONE, /* Just a string part */ 352 FORMAT_TYPE_WIDTH, 353 FORMAT_TYPE_PRECISION, 354 FORMAT_TYPE_CHAR, 355 FORMAT_TYPE_STR, 356 FORMAT_TYPE_PTR, 357 FORMAT_TYPE_PERCENT_CHAR, 358 FORMAT_TYPE_INVALID, 359 FORMAT_TYPE_LONG_LONG, 360 FORMAT_TYPE_ULONG, 361 FORMAT_TYPE_LONG, 362 FORMAT_TYPE_UBYTE, 363 FORMAT_TYPE_BYTE, 364 FORMAT_TYPE_USHORT, 365 FORMAT_TYPE_SHORT, 366 FORMAT_TYPE_UINT, 367 FORMAT_TYPE_INT, 368 FORMAT_TYPE_SIZE_T, 369 FORMAT_TYPE_PTRDIFF 370 }; 371 372 struct printf_spec { 373 u8 type; /* format_type enum */ 374 u8 flags; /* flags to number() */ 375 u8 base; /* number base, 8, 10 or 16 only */ 376 u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */ 377 s16 field_width; /* width of output field */ 378 s16 precision; /* # of digits/chars */ 379 }; 380 381 static noinline_for_stack 382 char *number(char *buf, char *end, unsigned long long num, 383 struct printf_spec spec) 384 { 385 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ 386 static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ 387 388 char tmp[66]; 389 char sign; 390 char locase; 391 int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); 392 int i; 393 bool is_zero = num == 0LL; 394 395 /* locase = 0 or 0x20. ORing digits or letters with 'locase' 396 * produces same digits or (maybe lowercased) letters */ 397 locase = (spec.flags & SMALL); 398 if (spec.flags & LEFT) 399 spec.flags &= ~ZEROPAD; 400 sign = 0; 401 if (spec.flags & SIGN) { 402 if ((signed long long)num < 0) { 403 sign = '-'; 404 num = -(signed long long)num; 405 spec.field_width--; 406 } else if (spec.flags & PLUS) { 407 sign = '+'; 408 spec.field_width--; 409 } else if (spec.flags & SPACE) { 410 sign = ' '; 411 spec.field_width--; 412 } 413 } 414 if (need_pfx) { 415 if (spec.base == 16) 416 spec.field_width -= 2; 417 else if (!is_zero) 418 spec.field_width--; 419 } 420 421 /* generate full string in tmp[], in reverse order */ 422 i = 0; 423 if (num < spec.base) 424 tmp[i++] = digits[num] | locase; 425 /* Generic code, for any base: 426 else do { 427 tmp[i++] = (digits[do_div(num,base)] | locase); 428 } while (num != 0); 429 */ 430 else if (spec.base != 10) { /* 8 or 16 */ 431 int mask = spec.base - 1; 432 int shift = 3; 433 434 if (spec.base == 16) 435 shift = 4; 436 do { 437 tmp[i++] = (digits[((unsigned char)num) & mask] | locase); 438 num >>= shift; 439 } while (num); 440 } else { /* base 10 */ 441 i = put_dec(tmp, num) - tmp; 442 } 443 444 /* printing 100 using %2d gives "100", not "00" */ 445 if (i > spec.precision) 446 spec.precision = i; 447 /* leading space padding */ 448 spec.field_width -= spec.precision; 449 if (!(spec.flags & (ZEROPAD+LEFT))) { 450 while (--spec.field_width >= 0) { 451 if (buf < end) 452 *buf = ' '; 453 ++buf; 454 } 455 } 456 /* sign */ 457 if (sign) { 458 if (buf < end) 459 *buf = sign; 460 ++buf; 461 } 462 /* "0x" / "0" prefix */ 463 if (need_pfx) { 464 if (spec.base == 16 || !is_zero) { 465 if (buf < end) 466 *buf = '0'; 467 ++buf; 468 } 469 if (spec.base == 16) { 470 if (buf < end) 471 *buf = ('X' | locase); 472 ++buf; 473 } 474 } 475 /* zero or space padding */ 476 if (!(spec.flags & LEFT)) { 477 char c = (spec.flags & ZEROPAD) ? '0' : ' '; 478 while (--spec.field_width >= 0) { 479 if (buf < end) 480 *buf = c; 481 ++buf; 482 } 483 } 484 /* hmm even more zero padding? */ 485 while (i <= --spec.precision) { 486 if (buf < end) 487 *buf = '0'; 488 ++buf; 489 } 490 /* actual digits of result */ 491 while (--i >= 0) { 492 if (buf < end) 493 *buf = tmp[i]; 494 ++buf; 495 } 496 /* trailing space padding */ 497 while (--spec.field_width >= 0) { 498 if (buf < end) 499 *buf = ' '; 500 ++buf; 501 } 502 503 return buf; 504 } 505 506 static noinline_for_stack 507 char *string(char *buf, char *end, const char *s, struct printf_spec spec) 508 { 509 int len, i; 510 511 if ((unsigned long)s < PAGE_SIZE) 512 s = "(null)"; 513 514 len = strnlen(s, spec.precision); 515 516 if (!(spec.flags & LEFT)) { 517 while (len < spec.field_width--) { 518 if (buf < end) 519 *buf = ' '; 520 ++buf; 521 } 522 } 523 for (i = 0; i < len; ++i) { 524 if (buf < end) 525 *buf = *s; 526 ++buf; ++s; 527 } 528 while (len < spec.field_width--) { 529 if (buf < end) 530 *buf = ' '; 531 ++buf; 532 } 533 534 return buf; 535 } 536 537 static void widen(char *buf, char *end, unsigned len, unsigned spaces) 538 { 539 size_t size; 540 if (buf >= end) /* nowhere to put anything */ 541 return; 542 size = end - buf; 543 if (size <= spaces) { 544 memset(buf, ' ', size); 545 return; 546 } 547 if (len) { 548 if (len > size - spaces) 549 len = size - spaces; 550 memmove(buf + spaces, buf, len); 551 } 552 memset(buf, ' ', spaces); 553 } 554 555 static noinline_for_stack 556 char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec, 557 const char *fmt) 558 { 559 const char *array[4], *s; 560 const struct dentry *p; 561 int depth; 562 int i, n; 563 564 switch (fmt[1]) { 565 case '2': case '3': case '4': 566 depth = fmt[1] - '0'; 567 break; 568 default: 569 depth = 1; 570 } 571 572 rcu_read_lock(); 573 for (i = 0; i < depth; i++, d = p) { 574 p = ACCESS_ONCE(d->d_parent); 575 array[i] = ACCESS_ONCE(d->d_name.name); 576 if (p == d) { 577 if (i) 578 array[i] = ""; 579 i++; 580 break; 581 } 582 } 583 s = array[--i]; 584 for (n = 0; n != spec.precision; n++, buf++) { 585 char c = *s++; 586 if (!c) { 587 if (!i) 588 break; 589 c = '/'; 590 s = array[--i]; 591 } 592 if (buf < end) 593 *buf = c; 594 } 595 rcu_read_unlock(); 596 if (n < spec.field_width) { 597 /* we want to pad the sucker */ 598 unsigned spaces = spec.field_width - n; 599 if (!(spec.flags & LEFT)) { 600 widen(buf - n, end, n, spaces); 601 return buf + spaces; 602 } 603 while (spaces--) { 604 if (buf < end) 605 *buf = ' '; 606 ++buf; 607 } 608 } 609 return buf; 610 } 611 612 static noinline_for_stack 613 char *symbol_string(char *buf, char *end, void *ptr, 614 struct printf_spec spec, const char *fmt) 615 { 616 unsigned long value; 617 #ifdef CONFIG_KALLSYMS 618 char sym[KSYM_SYMBOL_LEN]; 619 #endif 620 621 if (fmt[1] == 'R') 622 ptr = __builtin_extract_return_addr(ptr); 623 value = (unsigned long)ptr; 624 625 #ifdef CONFIG_KALLSYMS 626 if (*fmt == 'B') 627 sprint_backtrace(sym, value); 628 else if (*fmt != 'f' && *fmt != 's') 629 sprint_symbol(sym, value); 630 else 631 sprint_symbol_no_offset(sym, value); 632 633 return string(buf, end, sym, spec); 634 #else 635 spec.field_width = 2 * sizeof(void *); 636 spec.flags |= SPECIAL | SMALL | ZEROPAD; 637 spec.base = 16; 638 639 return number(buf, end, value, spec); 640 #endif 641 } 642 643 static noinline_for_stack 644 char *resource_string(char *buf, char *end, struct resource *res, 645 struct printf_spec spec, const char *fmt) 646 { 647 #ifndef IO_RSRC_PRINTK_SIZE 648 #define IO_RSRC_PRINTK_SIZE 6 649 #endif 650 651 #ifndef MEM_RSRC_PRINTK_SIZE 652 #define MEM_RSRC_PRINTK_SIZE 10 653 #endif 654 static const struct printf_spec io_spec = { 655 .base = 16, 656 .field_width = IO_RSRC_PRINTK_SIZE, 657 .precision = -1, 658 .flags = SPECIAL | SMALL | ZEROPAD, 659 }; 660 static const struct printf_spec mem_spec = { 661 .base = 16, 662 .field_width = MEM_RSRC_PRINTK_SIZE, 663 .precision = -1, 664 .flags = SPECIAL | SMALL | ZEROPAD, 665 }; 666 static const struct printf_spec bus_spec = { 667 .base = 16, 668 .field_width = 2, 669 .precision = -1, 670 .flags = SMALL | ZEROPAD, 671 }; 672 static const struct printf_spec dec_spec = { 673 .base = 10, 674 .precision = -1, 675 .flags = 0, 676 }; 677 static const struct printf_spec str_spec = { 678 .field_width = -1, 679 .precision = 10, 680 .flags = LEFT, 681 }; 682 static const struct printf_spec flag_spec = { 683 .base = 16, 684 .precision = -1, 685 .flags = SPECIAL | SMALL, 686 }; 687 688 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) 689 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ 690 #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) 691 #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) 692 #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") 693 #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") 694 char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, 695 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; 696 697 char *p = sym, *pend = sym + sizeof(sym); 698 int decode = (fmt[0] == 'R') ? 1 : 0; 699 const struct printf_spec *specp; 700 701 *p++ = '['; 702 if (res->flags & IORESOURCE_IO) { 703 p = string(p, pend, "io ", str_spec); 704 specp = &io_spec; 705 } else if (res->flags & IORESOURCE_MEM) { 706 p = string(p, pend, "mem ", str_spec); 707 specp = &mem_spec; 708 } else if (res->flags & IORESOURCE_IRQ) { 709 p = string(p, pend, "irq ", str_spec); 710 specp = &dec_spec; 711 } else if (res->flags & IORESOURCE_DMA) { 712 p = string(p, pend, "dma ", str_spec); 713 specp = &dec_spec; 714 } else if (res->flags & IORESOURCE_BUS) { 715 p = string(p, pend, "bus ", str_spec); 716 specp = &bus_spec; 717 } else { 718 p = string(p, pend, "??? ", str_spec); 719 specp = &mem_spec; 720 decode = 0; 721 } 722 if (decode && res->flags & IORESOURCE_UNSET) { 723 p = string(p, pend, "size ", str_spec); 724 p = number(p, pend, resource_size(res), *specp); 725 } else { 726 p = number(p, pend, res->start, *specp); 727 if (res->start != res->end) { 728 *p++ = '-'; 729 p = number(p, pend, res->end, *specp); 730 } 731 } 732 if (decode) { 733 if (res->flags & IORESOURCE_MEM_64) 734 p = string(p, pend, " 64bit", str_spec); 735 if (res->flags & IORESOURCE_PREFETCH) 736 p = string(p, pend, " pref", str_spec); 737 if (res->flags & IORESOURCE_WINDOW) 738 p = string(p, pend, " window", str_spec); 739 if (res->flags & IORESOURCE_DISABLED) 740 p = string(p, pend, " disabled", str_spec); 741 } else { 742 p = string(p, pend, " flags ", str_spec); 743 p = number(p, pend, res->flags, flag_spec); 744 } 745 *p++ = ']'; 746 *p = '\0'; 747 748 return string(buf, end, sym, spec); 749 } 750 751 static noinline_for_stack 752 char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, 753 const char *fmt) 754 { 755 int i, len = 1; /* if we pass '%ph[CDN]', field width remains 756 negative value, fallback to the default */ 757 char separator; 758 759 if (spec.field_width == 0) 760 /* nothing to print */ 761 return buf; 762 763 if (ZERO_OR_NULL_PTR(addr)) 764 /* NULL pointer */ 765 return string(buf, end, NULL, spec); 766 767 switch (fmt[1]) { 768 case 'C': 769 separator = ':'; 770 break; 771 case 'D': 772 separator = '-'; 773 break; 774 case 'N': 775 separator = 0; 776 break; 777 default: 778 separator = ' '; 779 break; 780 } 781 782 if (spec.field_width > 0) 783 len = min_t(int, spec.field_width, 64); 784 785 for (i = 0; i < len && buf < end - 1; i++) { 786 buf = hex_byte_pack(buf, addr[i]); 787 788 if (buf < end && separator && i != len - 1) 789 *buf++ = separator; 790 } 791 792 return buf; 793 } 794 795 static noinline_for_stack 796 char *mac_address_string(char *buf, char *end, u8 *addr, 797 struct printf_spec spec, const char *fmt) 798 { 799 char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; 800 char *p = mac_addr; 801 int i; 802 char separator; 803 bool reversed = false; 804 805 switch (fmt[1]) { 806 case 'F': 807 separator = '-'; 808 break; 809 810 case 'R': 811 reversed = true; 812 /* fall through */ 813 814 default: 815 separator = ':'; 816 break; 817 } 818 819 for (i = 0; i < 6; i++) { 820 if (reversed) 821 p = hex_byte_pack(p, addr[5 - i]); 822 else 823 p = hex_byte_pack(p, addr[i]); 824 825 if (fmt[0] == 'M' && i != 5) 826 *p++ = separator; 827 } 828 *p = '\0'; 829 830 return string(buf, end, mac_addr, spec); 831 } 832 833 static noinline_for_stack 834 char *ip4_string(char *p, const u8 *addr, const char *fmt) 835 { 836 int i; 837 bool leading_zeros = (fmt[0] == 'i'); 838 int index; 839 int step; 840 841 switch (fmt[2]) { 842 case 'h': 843 #ifdef __BIG_ENDIAN 844 index = 0; 845 step = 1; 846 #else 847 index = 3; 848 step = -1; 849 #endif 850 break; 851 case 'l': 852 index = 3; 853 step = -1; 854 break; 855 case 'n': 856 case 'b': 857 default: 858 index = 0; 859 step = 1; 860 break; 861 } 862 for (i = 0; i < 4; i++) { 863 char temp[3]; /* hold each IP quad in reverse order */ 864 int digits = put_dec_trunc8(temp, addr[index]) - temp; 865 if (leading_zeros) { 866 if (digits < 3) 867 *p++ = '0'; 868 if (digits < 2) 869 *p++ = '0'; 870 } 871 /* reverse the digits in the quad */ 872 while (digits--) 873 *p++ = temp[digits]; 874 if (i < 3) 875 *p++ = '.'; 876 index += step; 877 } 878 *p = '\0'; 879 880 return p; 881 } 882 883 static noinline_for_stack 884 char *ip6_compressed_string(char *p, const char *addr) 885 { 886 int i, j, range; 887 unsigned char zerolength[8]; 888 int longest = 1; 889 int colonpos = -1; 890 u16 word; 891 u8 hi, lo; 892 bool needcolon = false; 893 bool useIPv4; 894 struct in6_addr in6; 895 896 memcpy(&in6, addr, sizeof(struct in6_addr)); 897 898 useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); 899 900 memset(zerolength, 0, sizeof(zerolength)); 901 902 if (useIPv4) 903 range = 6; 904 else 905 range = 8; 906 907 /* find position of longest 0 run */ 908 for (i = 0; i < range; i++) { 909 for (j = i; j < range; j++) { 910 if (in6.s6_addr16[j] != 0) 911 break; 912 zerolength[i]++; 913 } 914 } 915 for (i = 0; i < range; i++) { 916 if (zerolength[i] > longest) { 917 longest = zerolength[i]; 918 colonpos = i; 919 } 920 } 921 if (longest == 1) /* don't compress a single 0 */ 922 colonpos = -1; 923 924 /* emit address */ 925 for (i = 0; i < range; i++) { 926 if (i == colonpos) { 927 if (needcolon || i == 0) 928 *p++ = ':'; 929 *p++ = ':'; 930 needcolon = false; 931 i += longest - 1; 932 continue; 933 } 934 if (needcolon) { 935 *p++ = ':'; 936 needcolon = false; 937 } 938 /* hex u16 without leading 0s */ 939 word = ntohs(in6.s6_addr16[i]); 940 hi = word >> 8; 941 lo = word & 0xff; 942 if (hi) { 943 if (hi > 0x0f) 944 p = hex_byte_pack(p, hi); 945 else 946 *p++ = hex_asc_lo(hi); 947 p = hex_byte_pack(p, lo); 948 } 949 else if (lo > 0x0f) 950 p = hex_byte_pack(p, lo); 951 else 952 *p++ = hex_asc_lo(lo); 953 needcolon = true; 954 } 955 956 if (useIPv4) { 957 if (needcolon) 958 *p++ = ':'; 959 p = ip4_string(p, &in6.s6_addr[12], "I4"); 960 } 961 *p = '\0'; 962 963 return p; 964 } 965 966 static noinline_for_stack 967 char *ip6_string(char *p, const char *addr, const char *fmt) 968 { 969 int i; 970 971 for (i = 0; i < 8; i++) { 972 p = hex_byte_pack(p, *addr++); 973 p = hex_byte_pack(p, *addr++); 974 if (fmt[0] == 'I' && i != 7) 975 *p++ = ':'; 976 } 977 *p = '\0'; 978 979 return p; 980 } 981 982 static noinline_for_stack 983 char *ip6_addr_string(char *buf, char *end, const u8 *addr, 984 struct printf_spec spec, const char *fmt) 985 { 986 char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; 987 988 if (fmt[0] == 'I' && fmt[2] == 'c') 989 ip6_compressed_string(ip6_addr, addr); 990 else 991 ip6_string(ip6_addr, addr, fmt); 992 993 return string(buf, end, ip6_addr, spec); 994 } 995 996 static noinline_for_stack 997 char *ip4_addr_string(char *buf, char *end, const u8 *addr, 998 struct printf_spec spec, const char *fmt) 999 { 1000 char ip4_addr[sizeof("255.255.255.255")]; 1001 1002 ip4_string(ip4_addr, addr, fmt); 1003 1004 return string(buf, end, ip4_addr, spec); 1005 } 1006 1007 static noinline_for_stack 1008 char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa, 1009 struct printf_spec spec, const char *fmt) 1010 { 1011 bool have_p = false, have_s = false, have_f = false, have_c = false; 1012 char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") + 1013 sizeof(":12345") + sizeof("/123456789") + 1014 sizeof("%1234567890")]; 1015 char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr); 1016 const u8 *addr = (const u8 *) &sa->sin6_addr; 1017 char fmt6[2] = { fmt[0], '6' }; 1018 u8 off = 0; 1019 1020 fmt++; 1021 while (isalpha(*++fmt)) { 1022 switch (*fmt) { 1023 case 'p': 1024 have_p = true; 1025 break; 1026 case 'f': 1027 have_f = true; 1028 break; 1029 case 's': 1030 have_s = true; 1031 break; 1032 case 'c': 1033 have_c = true; 1034 break; 1035 } 1036 } 1037 1038 if (have_p || have_s || have_f) { 1039 *p = '['; 1040 off = 1; 1041 } 1042 1043 if (fmt6[0] == 'I' && have_c) 1044 p = ip6_compressed_string(ip6_addr + off, addr); 1045 else 1046 p = ip6_string(ip6_addr + off, addr, fmt6); 1047 1048 if (have_p || have_s || have_f) 1049 *p++ = ']'; 1050 1051 if (have_p) { 1052 *p++ = ':'; 1053 p = number(p, pend, ntohs(sa->sin6_port), spec); 1054 } 1055 if (have_f) { 1056 *p++ = '/'; 1057 p = number(p, pend, ntohl(sa->sin6_flowinfo & 1058 IPV6_FLOWINFO_MASK), spec); 1059 } 1060 if (have_s) { 1061 *p++ = '%'; 1062 p = number(p, pend, sa->sin6_scope_id, spec); 1063 } 1064 *p = '\0'; 1065 1066 return string(buf, end, ip6_addr, spec); 1067 } 1068 1069 static noinline_for_stack 1070 char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa, 1071 struct printf_spec spec, const char *fmt) 1072 { 1073 bool have_p = false; 1074 char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")]; 1075 char *pend = ip4_addr + sizeof(ip4_addr); 1076 const u8 *addr = (const u8 *) &sa->sin_addr.s_addr; 1077 char fmt4[3] = { fmt[0], '4', 0 }; 1078 1079 fmt++; 1080 while (isalpha(*++fmt)) { 1081 switch (*fmt) { 1082 case 'p': 1083 have_p = true; 1084 break; 1085 case 'h': 1086 case 'l': 1087 case 'n': 1088 case 'b': 1089 fmt4[2] = *fmt; 1090 break; 1091 } 1092 } 1093 1094 p = ip4_string(ip4_addr, addr, fmt4); 1095 if (have_p) { 1096 *p++ = ':'; 1097 p = number(p, pend, ntohs(sa->sin_port), spec); 1098 } 1099 *p = '\0'; 1100 1101 return string(buf, end, ip4_addr, spec); 1102 } 1103 1104 static noinline_for_stack 1105 char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec, 1106 const char *fmt) 1107 { 1108 bool found = true; 1109 int count = 1; 1110 unsigned int flags = 0; 1111 int len; 1112 1113 if (spec.field_width == 0) 1114 return buf; /* nothing to print */ 1115 1116 if (ZERO_OR_NULL_PTR(addr)) 1117 return string(buf, end, NULL, spec); /* NULL pointer */ 1118 1119 1120 do { 1121 switch (fmt[count++]) { 1122 case 'a': 1123 flags |= ESCAPE_ANY; 1124 break; 1125 case 'c': 1126 flags |= ESCAPE_SPECIAL; 1127 break; 1128 case 'h': 1129 flags |= ESCAPE_HEX; 1130 break; 1131 case 'n': 1132 flags |= ESCAPE_NULL; 1133 break; 1134 case 'o': 1135 flags |= ESCAPE_OCTAL; 1136 break; 1137 case 'p': 1138 flags |= ESCAPE_NP; 1139 break; 1140 case 's': 1141 flags |= ESCAPE_SPACE; 1142 break; 1143 default: 1144 found = false; 1145 break; 1146 } 1147 } while (found); 1148 1149 if (!flags) 1150 flags = ESCAPE_ANY_NP; 1151 1152 len = spec.field_width < 0 ? 1 : spec.field_width; 1153 1154 /* Ignore the error. We print as many characters as we can */ 1155 string_escape_mem(addr, len, &buf, end - buf, flags, NULL); 1156 1157 return buf; 1158 } 1159 1160 static noinline_for_stack 1161 char *uuid_string(char *buf, char *end, const u8 *addr, 1162 struct printf_spec spec, const char *fmt) 1163 { 1164 char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; 1165 char *p = uuid; 1166 int i; 1167 static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; 1168 static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; 1169 const u8 *index = be; 1170 bool uc = false; 1171 1172 switch (*(++fmt)) { 1173 case 'L': 1174 uc = true; /* fall-through */ 1175 case 'l': 1176 index = le; 1177 break; 1178 case 'B': 1179 uc = true; 1180 break; 1181 } 1182 1183 for (i = 0; i < 16; i++) { 1184 p = hex_byte_pack(p, addr[index[i]]); 1185 switch (i) { 1186 case 3: 1187 case 5: 1188 case 7: 1189 case 9: 1190 *p++ = '-'; 1191 break; 1192 } 1193 } 1194 1195 *p = 0; 1196 1197 if (uc) { 1198 p = uuid; 1199 do { 1200 *p = toupper(*p); 1201 } while (*(++p)); 1202 } 1203 1204 return string(buf, end, uuid, spec); 1205 } 1206 1207 static 1208 char *netdev_feature_string(char *buf, char *end, const u8 *addr, 1209 struct printf_spec spec) 1210 { 1211 spec.flags |= SPECIAL | SMALL | ZEROPAD; 1212 if (spec.field_width == -1) 1213 spec.field_width = 2 + 2 * sizeof(netdev_features_t); 1214 spec.base = 16; 1215 1216 return number(buf, end, *(const netdev_features_t *)addr, spec); 1217 } 1218 1219 static noinline_for_stack 1220 char *address_val(char *buf, char *end, const void *addr, 1221 struct printf_spec spec, const char *fmt) 1222 { 1223 unsigned long long num; 1224 1225 spec.flags |= SPECIAL | SMALL | ZEROPAD; 1226 spec.base = 16; 1227 1228 switch (fmt[1]) { 1229 case 'd': 1230 num = *(const dma_addr_t *)addr; 1231 spec.field_width = sizeof(dma_addr_t) * 2 + 2; 1232 break; 1233 case 'p': 1234 default: 1235 num = *(const phys_addr_t *)addr; 1236 spec.field_width = sizeof(phys_addr_t) * 2 + 2; 1237 break; 1238 } 1239 1240 return number(buf, end, num, spec); 1241 } 1242 1243 int kptr_restrict __read_mostly; 1244 1245 /* 1246 * Show a '%p' thing. A kernel extension is that the '%p' is followed 1247 * by an extra set of alphanumeric characters that are extended format 1248 * specifiers. 1249 * 1250 * Right now we handle: 1251 * 1252 * - 'F' For symbolic function descriptor pointers with offset 1253 * - 'f' For simple symbolic function names without offset 1254 * - 'S' For symbolic direct pointers with offset 1255 * - 's' For symbolic direct pointers without offset 1256 * - '[FfSs]R' as above with __builtin_extract_return_addr() translation 1257 * - 'B' For backtraced symbolic direct pointers with offset 1258 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] 1259 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] 1260 * - 'M' For a 6-byte MAC address, it prints the address in the 1261 * usual colon-separated hex notation 1262 * - 'm' For a 6-byte MAC address, it prints the hex address without colons 1263 * - 'MF' For a 6-byte MAC FDDI address, it prints the address 1264 * with a dash-separated hex notation 1265 * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth) 1266 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way 1267 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) 1268 * IPv6 uses colon separated network-order 16 bit hex with leading 0's 1269 * [S][pfs] 1270 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to 1271 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] 1272 * - 'i' [46] for 'raw' IPv4/IPv6 addresses 1273 * IPv6 omits the colons (01020304...0f) 1274 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) 1275 * [S][pfs] 1276 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to 1277 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] 1278 * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order 1279 * - 'I[6S]c' for IPv6 addresses printed as specified by 1280 * http://tools.ietf.org/html/rfc5952 1281 * - 'E[achnops]' For an escaped buffer, where rules are defined by combination 1282 * of the following flags (see string_escape_mem() for the 1283 * details): 1284 * a - ESCAPE_ANY 1285 * c - ESCAPE_SPECIAL 1286 * h - ESCAPE_HEX 1287 * n - ESCAPE_NULL 1288 * o - ESCAPE_OCTAL 1289 * p - ESCAPE_NP 1290 * s - ESCAPE_SPACE 1291 * By default ESCAPE_ANY_NP is used. 1292 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form 1293 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" 1294 * Options for %pU are: 1295 * b big endian lower case hex (default) 1296 * B big endian UPPER case hex 1297 * l little endian lower case hex 1298 * L little endian UPPER case hex 1299 * big endian output byte order is: 1300 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] 1301 * little endian output byte order is: 1302 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] 1303 * - 'V' For a struct va_format which contains a format string * and va_list *, 1304 * call vsnprintf(->format, *->va_list). 1305 * Implements a "recursive vsnprintf". 1306 * Do not use this feature without some mechanism to verify the 1307 * correctness of the format string and va_list arguments. 1308 * - 'K' For a kernel pointer that should be hidden from unprivileged users 1309 * - 'NF' For a netdev_features_t 1310 * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with 1311 * a certain separator (' ' by default): 1312 * C colon 1313 * D dash 1314 * N no separator 1315 * The maximum supported length is 64 bytes of the input. Consider 1316 * to use print_hex_dump() for the larger input. 1317 * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives 1318 * (default assumed to be phys_addr_t, passed by reference) 1319 * - 'd[234]' For a dentry name (optionally 2-4 last components) 1320 * - 'D[234]' Same as 'd' but for a struct file 1321 * 1322 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 1323 * function pointers are really function descriptors, which contain a 1324 * pointer to the real address. 1325 */ 1326 static noinline_for_stack 1327 char *pointer(const char *fmt, char *buf, char *end, void *ptr, 1328 struct printf_spec spec) 1329 { 1330 int default_width = 2 * sizeof(void *) + (spec.flags & SPECIAL ? 2 : 0); 1331 1332 if (!ptr && *fmt != 'K') { 1333 /* 1334 * Print (null) with the same width as a pointer so it makes 1335 * tabular output look nice. 1336 */ 1337 if (spec.field_width == -1) 1338 spec.field_width = default_width; 1339 return string(buf, end, "(null)", spec); 1340 } 1341 1342 switch (*fmt) { 1343 case 'F': 1344 case 'f': 1345 ptr = dereference_function_descriptor(ptr); 1346 /* Fallthrough */ 1347 case 'S': 1348 case 's': 1349 case 'B': 1350 return symbol_string(buf, end, ptr, spec, fmt); 1351 case 'R': 1352 case 'r': 1353 return resource_string(buf, end, ptr, spec, fmt); 1354 case 'h': 1355 return hex_string(buf, end, ptr, spec, fmt); 1356 case 'M': /* Colon separated: 00:01:02:03:04:05 */ 1357 case 'm': /* Contiguous: 000102030405 */ 1358 /* [mM]F (FDDI) */ 1359 /* [mM]R (Reverse order; Bluetooth) */ 1360 return mac_address_string(buf, end, ptr, spec, fmt); 1361 case 'I': /* Formatted IP supported 1362 * 4: 1.2.3.4 1363 * 6: 0001:0203:...:0708 1364 * 6c: 1::708 or 1::1.2.3.4 1365 */ 1366 case 'i': /* Contiguous: 1367 * 4: 001.002.003.004 1368 * 6: 000102...0f 1369 */ 1370 switch (fmt[1]) { 1371 case '6': 1372 return ip6_addr_string(buf, end, ptr, spec, fmt); 1373 case '4': 1374 return ip4_addr_string(buf, end, ptr, spec, fmt); 1375 case 'S': { 1376 const union { 1377 struct sockaddr raw; 1378 struct sockaddr_in v4; 1379 struct sockaddr_in6 v6; 1380 } *sa = ptr; 1381 1382 switch (sa->raw.sa_family) { 1383 case AF_INET: 1384 return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt); 1385 case AF_INET6: 1386 return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt); 1387 default: 1388 return string(buf, end, "(invalid address)", spec); 1389 }} 1390 } 1391 break; 1392 case 'E': 1393 return escaped_string(buf, end, ptr, spec, fmt); 1394 case 'U': 1395 return uuid_string(buf, end, ptr, spec, fmt); 1396 case 'V': 1397 { 1398 va_list va; 1399 1400 va_copy(va, *((struct va_format *)ptr)->va); 1401 buf += vsnprintf(buf, end > buf ? end - buf : 0, 1402 ((struct va_format *)ptr)->fmt, va); 1403 va_end(va); 1404 return buf; 1405 } 1406 case 'K': 1407 /* 1408 * %pK cannot be used in IRQ context because its test 1409 * for CAP_SYSLOG would be meaningless. 1410 */ 1411 if (kptr_restrict && (in_irq() || in_serving_softirq() || 1412 in_nmi())) { 1413 if (spec.field_width == -1) 1414 spec.field_width = default_width; 1415 return string(buf, end, "pK-error", spec); 1416 } 1417 1418 switch (kptr_restrict) { 1419 case 0: 1420 /* Always print %pK values */ 1421 break; 1422 case 1: { 1423 /* 1424 * Only print the real pointer value if the current 1425 * process has CAP_SYSLOG and is running with the 1426 * same credentials it started with. This is because 1427 * access to files is checked at open() time, but %pK 1428 * checks permission at read() time. We don't want to 1429 * leak pointer values if a binary opens a file using 1430 * %pK and then elevates privileges before reading it. 1431 */ 1432 const struct cred *cred = current_cred(); 1433 1434 if (!has_capability_noaudit(current, CAP_SYSLOG) || 1435 !uid_eq(cred->euid, cred->uid) || 1436 !gid_eq(cred->egid, cred->gid)) 1437 ptr = NULL; 1438 break; 1439 } 1440 case 2: 1441 default: 1442 /* Always print 0's for %pK */ 1443 ptr = NULL; 1444 break; 1445 } 1446 break; 1447 1448 case 'N': 1449 switch (fmt[1]) { 1450 case 'F': 1451 return netdev_feature_string(buf, end, ptr, spec); 1452 } 1453 break; 1454 case 'a': 1455 return address_val(buf, end, ptr, spec, fmt); 1456 case 'd': 1457 return dentry_name(buf, end, ptr, spec, fmt); 1458 case 'D': 1459 return dentry_name(buf, end, 1460 ((const struct file *)ptr)->f_path.dentry, 1461 spec, fmt); 1462 } 1463 spec.flags |= SMALL; 1464 if (spec.field_width == -1) { 1465 spec.field_width = default_width; 1466 spec.flags |= ZEROPAD; 1467 } 1468 spec.base = 16; 1469 1470 return number(buf, end, (unsigned long) ptr, spec); 1471 } 1472 1473 /* 1474 * Helper function to decode printf style format. 1475 * Each call decode a token from the format and return the 1476 * number of characters read (or likely the delta where it wants 1477 * to go on the next call). 1478 * The decoded token is returned through the parameters 1479 * 1480 * 'h', 'l', or 'L' for integer fields 1481 * 'z' support added 23/7/1999 S.H. 1482 * 'z' changed to 'Z' --davidm 1/25/99 1483 * 't' added for ptrdiff_t 1484 * 1485 * @fmt: the format string 1486 * @type of the token returned 1487 * @flags: various flags such as +, -, # tokens.. 1488 * @field_width: overwritten width 1489 * @base: base of the number (octal, hex, ...) 1490 * @precision: precision of a number 1491 * @qualifier: qualifier of a number (long, size_t, ...) 1492 */ 1493 static noinline_for_stack 1494 int format_decode(const char *fmt, struct printf_spec *spec) 1495 { 1496 const char *start = fmt; 1497 1498 /* we finished early by reading the field width */ 1499 if (spec->type == FORMAT_TYPE_WIDTH) { 1500 if (spec->field_width < 0) { 1501 spec->field_width = -spec->field_width; 1502 spec->flags |= LEFT; 1503 } 1504 spec->type = FORMAT_TYPE_NONE; 1505 goto precision; 1506 } 1507 1508 /* we finished early by reading the precision */ 1509 if (spec->type == FORMAT_TYPE_PRECISION) { 1510 if (spec->precision < 0) 1511 spec->precision = 0; 1512 1513 spec->type = FORMAT_TYPE_NONE; 1514 goto qualifier; 1515 } 1516 1517 /* By default */ 1518 spec->type = FORMAT_TYPE_NONE; 1519 1520 for (; *fmt ; ++fmt) { 1521 if (*fmt == '%') 1522 break; 1523 } 1524 1525 /* Return the current non-format string */ 1526 if (fmt != start || !*fmt) 1527 return fmt - start; 1528 1529 /* Process flags */ 1530 spec->flags = 0; 1531 1532 while (1) { /* this also skips first '%' */ 1533 bool found = true; 1534 1535 ++fmt; 1536 1537 switch (*fmt) { 1538 case '-': spec->flags |= LEFT; break; 1539 case '+': spec->flags |= PLUS; break; 1540 case ' ': spec->flags |= SPACE; break; 1541 case '#': spec->flags |= SPECIAL; break; 1542 case '0': spec->flags |= ZEROPAD; break; 1543 default: found = false; 1544 } 1545 1546 if (!found) 1547 break; 1548 } 1549 1550 /* get field width */ 1551 spec->field_width = -1; 1552 1553 if (isdigit(*fmt)) 1554 spec->field_width = skip_atoi(&fmt); 1555 else if (*fmt == '*') { 1556 /* it's the next argument */ 1557 spec->type = FORMAT_TYPE_WIDTH; 1558 return ++fmt - start; 1559 } 1560 1561 precision: 1562 /* get the precision */ 1563 spec->precision = -1; 1564 if (*fmt == '.') { 1565 ++fmt; 1566 if (isdigit(*fmt)) { 1567 spec->precision = skip_atoi(&fmt); 1568 if (spec->precision < 0) 1569 spec->precision = 0; 1570 } else if (*fmt == '*') { 1571 /* it's the next argument */ 1572 spec->type = FORMAT_TYPE_PRECISION; 1573 return ++fmt - start; 1574 } 1575 } 1576 1577 qualifier: 1578 /* get the conversion qualifier */ 1579 spec->qualifier = -1; 1580 if (*fmt == 'h' || _tolower(*fmt) == 'l' || 1581 _tolower(*fmt) == 'z' || *fmt == 't') { 1582 spec->qualifier = *fmt++; 1583 if (unlikely(spec->qualifier == *fmt)) { 1584 if (spec->qualifier == 'l') { 1585 spec->qualifier = 'L'; 1586 ++fmt; 1587 } else if (spec->qualifier == 'h') { 1588 spec->qualifier = 'H'; 1589 ++fmt; 1590 } 1591 } 1592 } 1593 1594 /* default base */ 1595 spec->base = 10; 1596 switch (*fmt) { 1597 case 'c': 1598 spec->type = FORMAT_TYPE_CHAR; 1599 return ++fmt - start; 1600 1601 case 's': 1602 spec->type = FORMAT_TYPE_STR; 1603 return ++fmt - start; 1604 1605 case 'p': 1606 spec->type = FORMAT_TYPE_PTR; 1607 return fmt - start; 1608 /* skip alnum */ 1609 1610 case '%': 1611 spec->type = FORMAT_TYPE_PERCENT_CHAR; 1612 return ++fmt - start; 1613 1614 /* integer number formats - set up the flags and "break" */ 1615 case 'o': 1616 spec->base = 8; 1617 break; 1618 1619 case 'x': 1620 spec->flags |= SMALL; 1621 1622 case 'X': 1623 spec->base = 16; 1624 break; 1625 1626 case 'd': 1627 case 'i': 1628 spec->flags |= SIGN; 1629 case 'u': 1630 break; 1631 1632 case 'n': 1633 /* 1634 * Since %n poses a greater security risk than utility, treat 1635 * it as an invalid format specifier. Warn about its use so 1636 * that new instances don't get added. 1637 */ 1638 WARN_ONCE(1, "Please remove ignored %%n in '%s'\n", fmt); 1639 /* Fall-through */ 1640 1641 default: 1642 spec->type = FORMAT_TYPE_INVALID; 1643 return fmt - start; 1644 } 1645 1646 if (spec->qualifier == 'L') 1647 spec->type = FORMAT_TYPE_LONG_LONG; 1648 else if (spec->qualifier == 'l') { 1649 if (spec->flags & SIGN) 1650 spec->type = FORMAT_TYPE_LONG; 1651 else 1652 spec->type = FORMAT_TYPE_ULONG; 1653 } else if (_tolower(spec->qualifier) == 'z') { 1654 spec->type = FORMAT_TYPE_SIZE_T; 1655 } else if (spec->qualifier == 't') { 1656 spec->type = FORMAT_TYPE_PTRDIFF; 1657 } else if (spec->qualifier == 'H') { 1658 if (spec->flags & SIGN) 1659 spec->type = FORMAT_TYPE_BYTE; 1660 else 1661 spec->type = FORMAT_TYPE_UBYTE; 1662 } else if (spec->qualifier == 'h') { 1663 if (spec->flags & SIGN) 1664 spec->type = FORMAT_TYPE_SHORT; 1665 else 1666 spec->type = FORMAT_TYPE_USHORT; 1667 } else { 1668 if (spec->flags & SIGN) 1669 spec->type = FORMAT_TYPE_INT; 1670 else 1671 spec->type = FORMAT_TYPE_UINT; 1672 } 1673 1674 return ++fmt - start; 1675 } 1676 1677 /** 1678 * vsnprintf - Format a string and place it in a buffer 1679 * @buf: The buffer to place the result into 1680 * @size: The size of the buffer, including the trailing null space 1681 * @fmt: The format string to use 1682 * @args: Arguments for the format string 1683 * 1684 * This function follows C99 vsnprintf, but has some extensions: 1685 * %pS output the name of a text symbol with offset 1686 * %ps output the name of a text symbol without offset 1687 * %pF output the name of a function pointer with its offset 1688 * %pf output the name of a function pointer without its offset 1689 * %pB output the name of a backtrace symbol with its offset 1690 * %pR output the address range in a struct resource with decoded flags 1691 * %pr output the address range in a struct resource with raw flags 1692 * %pM output a 6-byte MAC address with colons 1693 * %pMR output a 6-byte MAC address with colons in reversed order 1694 * %pMF output a 6-byte MAC address with dashes 1695 * %pm output a 6-byte MAC address without colons 1696 * %pmR output a 6-byte MAC address without colons in reversed order 1697 * %pI4 print an IPv4 address without leading zeros 1698 * %pi4 print an IPv4 address with leading zeros 1699 * %pI6 print an IPv6 address with colons 1700 * %pi6 print an IPv6 address without colons 1701 * %pI6c print an IPv6 address as specified by RFC 5952 1702 * %pIS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address 1703 * %piS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address 1704 * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper 1705 * case. 1706 * %*pE[achnops] print an escaped buffer 1707 * %*ph[CDN] a variable-length hex string with a separator (supports up to 64 1708 * bytes of the input) 1709 * %n is ignored 1710 * 1711 * ** Please update Documentation/printk-formats.txt when making changes ** 1712 * 1713 * The return value is the number of characters which would 1714 * be generated for the given input, excluding the trailing 1715 * '\0', as per ISO C99. If you want to have the exact 1716 * number of characters written into @buf as return value 1717 * (not including the trailing '\0'), use vscnprintf(). If the 1718 * return is greater than or equal to @size, the resulting 1719 * string is truncated. 1720 * 1721 * If you're not already dealing with a va_list consider using snprintf(). 1722 */ 1723 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) 1724 { 1725 unsigned long long num; 1726 char *str, *end; 1727 struct printf_spec spec = {0}; 1728 1729 /* Reject out-of-range values early. Large positive sizes are 1730 used for unknown buffer sizes. */ 1731 if (WARN_ON_ONCE((int) size < 0)) 1732 return 0; 1733 1734 str = buf; 1735 end = buf + size; 1736 1737 /* Make sure end is always >= buf */ 1738 if (end < buf) { 1739 end = ((void *)-1); 1740 size = end - buf; 1741 } 1742 1743 while (*fmt) { 1744 const char *old_fmt = fmt; 1745 int read = format_decode(fmt, &spec); 1746 1747 fmt += read; 1748 1749 switch (spec.type) { 1750 case FORMAT_TYPE_NONE: { 1751 int copy = read; 1752 if (str < end) { 1753 if (copy > end - str) 1754 copy = end - str; 1755 memcpy(str, old_fmt, copy); 1756 } 1757 str += read; 1758 break; 1759 } 1760 1761 case FORMAT_TYPE_WIDTH: 1762 spec.field_width = va_arg(args, int); 1763 break; 1764 1765 case FORMAT_TYPE_PRECISION: 1766 spec.precision = va_arg(args, int); 1767 break; 1768 1769 case FORMAT_TYPE_CHAR: { 1770 char c; 1771 1772 if (!(spec.flags & LEFT)) { 1773 while (--spec.field_width > 0) { 1774 if (str < end) 1775 *str = ' '; 1776 ++str; 1777 1778 } 1779 } 1780 c = (unsigned char) va_arg(args, int); 1781 if (str < end) 1782 *str = c; 1783 ++str; 1784 while (--spec.field_width > 0) { 1785 if (str < end) 1786 *str = ' '; 1787 ++str; 1788 } 1789 break; 1790 } 1791 1792 case FORMAT_TYPE_STR: 1793 str = string(str, end, va_arg(args, char *), spec); 1794 break; 1795 1796 case FORMAT_TYPE_PTR: 1797 str = pointer(fmt+1, str, end, va_arg(args, void *), 1798 spec); 1799 while (isalnum(*fmt)) 1800 fmt++; 1801 break; 1802 1803 case FORMAT_TYPE_PERCENT_CHAR: 1804 if (str < end) 1805 *str = '%'; 1806 ++str; 1807 break; 1808 1809 case FORMAT_TYPE_INVALID: 1810 if (str < end) 1811 *str = '%'; 1812 ++str; 1813 break; 1814 1815 default: 1816 switch (spec.type) { 1817 case FORMAT_TYPE_LONG_LONG: 1818 num = va_arg(args, long long); 1819 break; 1820 case FORMAT_TYPE_ULONG: 1821 num = va_arg(args, unsigned long); 1822 break; 1823 case FORMAT_TYPE_LONG: 1824 num = va_arg(args, long); 1825 break; 1826 case FORMAT_TYPE_SIZE_T: 1827 if (spec.flags & SIGN) 1828 num = va_arg(args, ssize_t); 1829 else 1830 num = va_arg(args, size_t); 1831 break; 1832 case FORMAT_TYPE_PTRDIFF: 1833 num = va_arg(args, ptrdiff_t); 1834 break; 1835 case FORMAT_TYPE_UBYTE: 1836 num = (unsigned char) va_arg(args, int); 1837 break; 1838 case FORMAT_TYPE_BYTE: 1839 num = (signed char) va_arg(args, int); 1840 break; 1841 case FORMAT_TYPE_USHORT: 1842 num = (unsigned short) va_arg(args, int); 1843 break; 1844 case FORMAT_TYPE_SHORT: 1845 num = (short) va_arg(args, int); 1846 break; 1847 case FORMAT_TYPE_INT: 1848 num = (int) va_arg(args, int); 1849 break; 1850 default: 1851 num = va_arg(args, unsigned int); 1852 } 1853 1854 str = number(str, end, num, spec); 1855 } 1856 } 1857 1858 if (size > 0) { 1859 if (str < end) 1860 *str = '\0'; 1861 else 1862 end[-1] = '\0'; 1863 } 1864 1865 /* the trailing null byte doesn't count towards the total */ 1866 return str-buf; 1867 1868 } 1869 EXPORT_SYMBOL(vsnprintf); 1870 1871 /** 1872 * vscnprintf - Format a string and place it in a buffer 1873 * @buf: The buffer to place the result into 1874 * @size: The size of the buffer, including the trailing null space 1875 * @fmt: The format string to use 1876 * @args: Arguments for the format string 1877 * 1878 * The return value is the number of characters which have been written into 1879 * the @buf not including the trailing '\0'. If @size is == 0 the function 1880 * returns 0. 1881 * 1882 * If you're not already dealing with a va_list consider using scnprintf(). 1883 * 1884 * See the vsnprintf() documentation for format string extensions over C99. 1885 */ 1886 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) 1887 { 1888 int i; 1889 1890 i = vsnprintf(buf, size, fmt, args); 1891 1892 if (likely(i < size)) 1893 return i; 1894 if (size != 0) 1895 return size - 1; 1896 return 0; 1897 } 1898 EXPORT_SYMBOL(vscnprintf); 1899 1900 /** 1901 * snprintf - Format a string and place it in a buffer 1902 * @buf: The buffer to place the result into 1903 * @size: The size of the buffer, including the trailing null space 1904 * @fmt: The format string to use 1905 * @...: Arguments for the format string 1906 * 1907 * The return value is the number of characters which would be 1908 * generated for the given input, excluding the trailing null, 1909 * as per ISO C99. If the return is greater than or equal to 1910 * @size, the resulting string is truncated. 1911 * 1912 * See the vsnprintf() documentation for format string extensions over C99. 1913 */ 1914 int snprintf(char *buf, size_t size, const char *fmt, ...) 1915 { 1916 va_list args; 1917 int i; 1918 1919 va_start(args, fmt); 1920 i = vsnprintf(buf, size, fmt, args); 1921 va_end(args); 1922 1923 return i; 1924 } 1925 EXPORT_SYMBOL(snprintf); 1926 1927 /** 1928 * scnprintf - Format a string and place it in a buffer 1929 * @buf: The buffer to place the result into 1930 * @size: The size of the buffer, including the trailing null space 1931 * @fmt: The format string to use 1932 * @...: Arguments for the format string 1933 * 1934 * The return value is the number of characters written into @buf not including 1935 * the trailing '\0'. If @size is == 0 the function returns 0. 1936 */ 1937 1938 int scnprintf(char *buf, size_t size, const char *fmt, ...) 1939 { 1940 va_list args; 1941 int i; 1942 1943 va_start(args, fmt); 1944 i = vscnprintf(buf, size, fmt, args); 1945 va_end(args); 1946 1947 return i; 1948 } 1949 EXPORT_SYMBOL(scnprintf); 1950 1951 /** 1952 * vsprintf - Format a string and place it in a buffer 1953 * @buf: The buffer to place the result into 1954 * @fmt: The format string to use 1955 * @args: Arguments for the format string 1956 * 1957 * The function returns the number of characters written 1958 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid 1959 * buffer overflows. 1960 * 1961 * If you're not already dealing with a va_list consider using sprintf(). 1962 * 1963 * See the vsnprintf() documentation for format string extensions over C99. 1964 */ 1965 int vsprintf(char *buf, const char *fmt, va_list args) 1966 { 1967 return vsnprintf(buf, INT_MAX, fmt, args); 1968 } 1969 EXPORT_SYMBOL(vsprintf); 1970 1971 /** 1972 * sprintf - Format a string and place it in a buffer 1973 * @buf: The buffer to place the result into 1974 * @fmt: The format string to use 1975 * @...: Arguments for the format string 1976 * 1977 * The function returns the number of characters written 1978 * into @buf. Use snprintf() or scnprintf() in order to avoid 1979 * buffer overflows. 1980 * 1981 * See the vsnprintf() documentation for format string extensions over C99. 1982 */ 1983 int sprintf(char *buf, const char *fmt, ...) 1984 { 1985 va_list args; 1986 int i; 1987 1988 va_start(args, fmt); 1989 i = vsnprintf(buf, INT_MAX, fmt, args); 1990 va_end(args); 1991 1992 return i; 1993 } 1994 EXPORT_SYMBOL(sprintf); 1995 1996 #ifdef CONFIG_BINARY_PRINTF 1997 /* 1998 * bprintf service: 1999 * vbin_printf() - VA arguments to binary data 2000 * bstr_printf() - Binary data to text string 2001 */ 2002 2003 /** 2004 * vbin_printf - Parse a format string and place args' binary value in a buffer 2005 * @bin_buf: The buffer to place args' binary value 2006 * @size: The size of the buffer(by words(32bits), not characters) 2007 * @fmt: The format string to use 2008 * @args: Arguments for the format string 2009 * 2010 * The format follows C99 vsnprintf, except %n is ignored, and its argument 2011 * is skipped. 2012 * 2013 * The return value is the number of words(32bits) which would be generated for 2014 * the given input. 2015 * 2016 * NOTE: 2017 * If the return value is greater than @size, the resulting bin_buf is NOT 2018 * valid for bstr_printf(). 2019 */ 2020 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) 2021 { 2022 struct printf_spec spec = {0}; 2023 char *str, *end; 2024 2025 str = (char *)bin_buf; 2026 end = (char *)(bin_buf + size); 2027 2028 #define save_arg(type) \ 2029 do { \ 2030 if (sizeof(type) == 8) { \ 2031 unsigned long long value; \ 2032 str = PTR_ALIGN(str, sizeof(u32)); \ 2033 value = va_arg(args, unsigned long long); \ 2034 if (str + sizeof(type) <= end) { \ 2035 *(u32 *)str = *(u32 *)&value; \ 2036 *(u32 *)(str + 4) = *((u32 *)&value + 1); \ 2037 } \ 2038 } else { \ 2039 unsigned long value; \ 2040 str = PTR_ALIGN(str, sizeof(type)); \ 2041 value = va_arg(args, int); \ 2042 if (str + sizeof(type) <= end) \ 2043 *(typeof(type) *)str = (type)value; \ 2044 } \ 2045 str += sizeof(type); \ 2046 } while (0) 2047 2048 while (*fmt) { 2049 int read = format_decode(fmt, &spec); 2050 2051 fmt += read; 2052 2053 switch (spec.type) { 2054 case FORMAT_TYPE_NONE: 2055 case FORMAT_TYPE_INVALID: 2056 case FORMAT_TYPE_PERCENT_CHAR: 2057 break; 2058 2059 case FORMAT_TYPE_WIDTH: 2060 case FORMAT_TYPE_PRECISION: 2061 save_arg(int); 2062 break; 2063 2064 case FORMAT_TYPE_CHAR: 2065 save_arg(char); 2066 break; 2067 2068 case FORMAT_TYPE_STR: { 2069 const char *save_str = va_arg(args, char *); 2070 size_t len; 2071 2072 if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE 2073 || (unsigned long)save_str < PAGE_SIZE) 2074 save_str = "(null)"; 2075 len = strlen(save_str) + 1; 2076 if (str + len < end) 2077 memcpy(str, save_str, len); 2078 str += len; 2079 break; 2080 } 2081 2082 case FORMAT_TYPE_PTR: 2083 save_arg(void *); 2084 /* skip all alphanumeric pointer suffixes */ 2085 while (isalnum(*fmt)) 2086 fmt++; 2087 break; 2088 2089 default: 2090 switch (spec.type) { 2091 2092 case FORMAT_TYPE_LONG_LONG: 2093 save_arg(long long); 2094 break; 2095 case FORMAT_TYPE_ULONG: 2096 case FORMAT_TYPE_LONG: 2097 save_arg(unsigned long); 2098 break; 2099 case FORMAT_TYPE_SIZE_T: 2100 save_arg(size_t); 2101 break; 2102 case FORMAT_TYPE_PTRDIFF: 2103 save_arg(ptrdiff_t); 2104 break; 2105 case FORMAT_TYPE_UBYTE: 2106 case FORMAT_TYPE_BYTE: 2107 save_arg(char); 2108 break; 2109 case FORMAT_TYPE_USHORT: 2110 case FORMAT_TYPE_SHORT: 2111 save_arg(short); 2112 break; 2113 default: 2114 save_arg(int); 2115 } 2116 } 2117 } 2118 2119 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; 2120 #undef save_arg 2121 } 2122 EXPORT_SYMBOL_GPL(vbin_printf); 2123 2124 /** 2125 * bstr_printf - Format a string from binary arguments and place it in a buffer 2126 * @buf: The buffer to place the result into 2127 * @size: The size of the buffer, including the trailing null space 2128 * @fmt: The format string to use 2129 * @bin_buf: Binary arguments for the format string 2130 * 2131 * This function like C99 vsnprintf, but the difference is that vsnprintf gets 2132 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is 2133 * a binary buffer that generated by vbin_printf. 2134 * 2135 * The format follows C99 vsnprintf, but has some extensions: 2136 * see vsnprintf comment for details. 2137 * 2138 * The return value is the number of characters which would 2139 * be generated for the given input, excluding the trailing 2140 * '\0', as per ISO C99. If you want to have the exact 2141 * number of characters written into @buf as return value 2142 * (not including the trailing '\0'), use vscnprintf(). If the 2143 * return is greater than or equal to @size, the resulting 2144 * string is truncated. 2145 */ 2146 int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) 2147 { 2148 struct printf_spec spec = {0}; 2149 char *str, *end; 2150 const char *args = (const char *)bin_buf; 2151 2152 if (WARN_ON_ONCE((int) size < 0)) 2153 return 0; 2154 2155 str = buf; 2156 end = buf + size; 2157 2158 #define get_arg(type) \ 2159 ({ \ 2160 typeof(type) value; \ 2161 if (sizeof(type) == 8) { \ 2162 args = PTR_ALIGN(args, sizeof(u32)); \ 2163 *(u32 *)&value = *(u32 *)args; \ 2164 *((u32 *)&value + 1) = *(u32 *)(args + 4); \ 2165 } else { \ 2166 args = PTR_ALIGN(args, sizeof(type)); \ 2167 value = *(typeof(type) *)args; \ 2168 } \ 2169 args += sizeof(type); \ 2170 value; \ 2171 }) 2172 2173 /* Make sure end is always >= buf */ 2174 if (end < buf) { 2175 end = ((void *)-1); 2176 size = end - buf; 2177 } 2178 2179 while (*fmt) { 2180 const char *old_fmt = fmt; 2181 int read = format_decode(fmt, &spec); 2182 2183 fmt += read; 2184 2185 switch (spec.type) { 2186 case FORMAT_TYPE_NONE: { 2187 int copy = read; 2188 if (str < end) { 2189 if (copy > end - str) 2190 copy = end - str; 2191 memcpy(str, old_fmt, copy); 2192 } 2193 str += read; 2194 break; 2195 } 2196 2197 case FORMAT_TYPE_WIDTH: 2198 spec.field_width = get_arg(int); 2199 break; 2200 2201 case FORMAT_TYPE_PRECISION: 2202 spec.precision = get_arg(int); 2203 break; 2204 2205 case FORMAT_TYPE_CHAR: { 2206 char c; 2207 2208 if (!(spec.flags & LEFT)) { 2209 while (--spec.field_width > 0) { 2210 if (str < end) 2211 *str = ' '; 2212 ++str; 2213 } 2214 } 2215 c = (unsigned char) get_arg(char); 2216 if (str < end) 2217 *str = c; 2218 ++str; 2219 while (--spec.field_width > 0) { 2220 if (str < end) 2221 *str = ' '; 2222 ++str; 2223 } 2224 break; 2225 } 2226 2227 case FORMAT_TYPE_STR: { 2228 const char *str_arg = args; 2229 args += strlen(str_arg) + 1; 2230 str = string(str, end, (char *)str_arg, spec); 2231 break; 2232 } 2233 2234 case FORMAT_TYPE_PTR: 2235 str = pointer(fmt+1, str, end, get_arg(void *), spec); 2236 while (isalnum(*fmt)) 2237 fmt++; 2238 break; 2239 2240 case FORMAT_TYPE_PERCENT_CHAR: 2241 case FORMAT_TYPE_INVALID: 2242 if (str < end) 2243 *str = '%'; 2244 ++str; 2245 break; 2246 2247 default: { 2248 unsigned long long num; 2249 2250 switch (spec.type) { 2251 2252 case FORMAT_TYPE_LONG_LONG: 2253 num = get_arg(long long); 2254 break; 2255 case FORMAT_TYPE_ULONG: 2256 case FORMAT_TYPE_LONG: 2257 num = get_arg(unsigned long); 2258 break; 2259 case FORMAT_TYPE_SIZE_T: 2260 num = get_arg(size_t); 2261 break; 2262 case FORMAT_TYPE_PTRDIFF: 2263 num = get_arg(ptrdiff_t); 2264 break; 2265 case FORMAT_TYPE_UBYTE: 2266 num = get_arg(unsigned char); 2267 break; 2268 case FORMAT_TYPE_BYTE: 2269 num = get_arg(signed char); 2270 break; 2271 case FORMAT_TYPE_USHORT: 2272 num = get_arg(unsigned short); 2273 break; 2274 case FORMAT_TYPE_SHORT: 2275 num = get_arg(short); 2276 break; 2277 case FORMAT_TYPE_UINT: 2278 num = get_arg(unsigned int); 2279 break; 2280 default: 2281 num = get_arg(int); 2282 } 2283 2284 str = number(str, end, num, spec); 2285 } /* default: */ 2286 } /* switch(spec.type) */ 2287 } /* while(*fmt) */ 2288 2289 if (size > 0) { 2290 if (str < end) 2291 *str = '\0'; 2292 else 2293 end[-1] = '\0'; 2294 } 2295 2296 #undef get_arg 2297 2298 /* the trailing null byte doesn't count towards the total */ 2299 return str - buf; 2300 } 2301 EXPORT_SYMBOL_GPL(bstr_printf); 2302 2303 /** 2304 * bprintf - Parse a format string and place args' binary value in a buffer 2305 * @bin_buf: The buffer to place args' binary value 2306 * @size: The size of the buffer(by words(32bits), not characters) 2307 * @fmt: The format string to use 2308 * @...: Arguments for the format string 2309 * 2310 * The function returns the number of words(u32) written 2311 * into @bin_buf. 2312 */ 2313 int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) 2314 { 2315 va_list args; 2316 int ret; 2317 2318 va_start(args, fmt); 2319 ret = vbin_printf(bin_buf, size, fmt, args); 2320 va_end(args); 2321 2322 return ret; 2323 } 2324 EXPORT_SYMBOL_GPL(bprintf); 2325 2326 #endif /* CONFIG_BINARY_PRINTF */ 2327 2328 /** 2329 * vsscanf - Unformat a buffer into a list of arguments 2330 * @buf: input buffer 2331 * @fmt: format of buffer 2332 * @args: arguments 2333 */ 2334 int vsscanf(const char *buf, const char *fmt, va_list args) 2335 { 2336 const char *str = buf; 2337 char *next; 2338 char digit; 2339 int num = 0; 2340 u8 qualifier; 2341 unsigned int base; 2342 union { 2343 long long s; 2344 unsigned long long u; 2345 } val; 2346 s16 field_width; 2347 bool is_sign; 2348 2349 while (*fmt) { 2350 /* skip any white space in format */ 2351 /* white space in format matchs any amount of 2352 * white space, including none, in the input. 2353 */ 2354 if (isspace(*fmt)) { 2355 fmt = skip_spaces(++fmt); 2356 str = skip_spaces(str); 2357 } 2358 2359 /* anything that is not a conversion must match exactly */ 2360 if (*fmt != '%' && *fmt) { 2361 if (*fmt++ != *str++) 2362 break; 2363 continue; 2364 } 2365 2366 if (!*fmt) 2367 break; 2368 ++fmt; 2369 2370 /* skip this conversion. 2371 * advance both strings to next white space 2372 */ 2373 if (*fmt == '*') { 2374 if (!*str) 2375 break; 2376 while (!isspace(*fmt) && *fmt != '%' && *fmt) 2377 fmt++; 2378 while (!isspace(*str) && *str) 2379 str++; 2380 continue; 2381 } 2382 2383 /* get field width */ 2384 field_width = -1; 2385 if (isdigit(*fmt)) { 2386 field_width = skip_atoi(&fmt); 2387 if (field_width <= 0) 2388 break; 2389 } 2390 2391 /* get conversion qualifier */ 2392 qualifier = -1; 2393 if (*fmt == 'h' || _tolower(*fmt) == 'l' || 2394 _tolower(*fmt) == 'z') { 2395 qualifier = *fmt++; 2396 if (unlikely(qualifier == *fmt)) { 2397 if (qualifier == 'h') { 2398 qualifier = 'H'; 2399 fmt++; 2400 } else if (qualifier == 'l') { 2401 qualifier = 'L'; 2402 fmt++; 2403 } 2404 } 2405 } 2406 2407 if (!*fmt) 2408 break; 2409 2410 if (*fmt == 'n') { 2411 /* return number of characters read so far */ 2412 *va_arg(args, int *) = str - buf; 2413 ++fmt; 2414 continue; 2415 } 2416 2417 if (!*str) 2418 break; 2419 2420 base = 10; 2421 is_sign = false; 2422 2423 switch (*fmt++) { 2424 case 'c': 2425 { 2426 char *s = (char *)va_arg(args, char*); 2427 if (field_width == -1) 2428 field_width = 1; 2429 do { 2430 *s++ = *str++; 2431 } while (--field_width > 0 && *str); 2432 num++; 2433 } 2434 continue; 2435 case 's': 2436 { 2437 char *s = (char *)va_arg(args, char *); 2438 if (field_width == -1) 2439 field_width = SHRT_MAX; 2440 /* first, skip leading white space in buffer */ 2441 str = skip_spaces(str); 2442 2443 /* now copy until next white space */ 2444 while (*str && !isspace(*str) && field_width--) 2445 *s++ = *str++; 2446 *s = '\0'; 2447 num++; 2448 } 2449 continue; 2450 case 'o': 2451 base = 8; 2452 break; 2453 case 'x': 2454 case 'X': 2455 base = 16; 2456 break; 2457 case 'i': 2458 base = 0; 2459 case 'd': 2460 is_sign = true; 2461 case 'u': 2462 break; 2463 case '%': 2464 /* looking for '%' in str */ 2465 if (*str++ != '%') 2466 return num; 2467 continue; 2468 default: 2469 /* invalid format; stop here */ 2470 return num; 2471 } 2472 2473 /* have some sort of integer conversion. 2474 * first, skip white space in buffer. 2475 */ 2476 str = skip_spaces(str); 2477 2478 digit = *str; 2479 if (is_sign && digit == '-') 2480 digit = *(str + 1); 2481 2482 if (!digit 2483 || (base == 16 && !isxdigit(digit)) 2484 || (base == 10 && !isdigit(digit)) 2485 || (base == 8 && (!isdigit(digit) || digit > '7')) 2486 || (base == 0 && !isdigit(digit))) 2487 break; 2488 2489 if (is_sign) 2490 val.s = qualifier != 'L' ? 2491 simple_strtol(str, &next, base) : 2492 simple_strtoll(str, &next, base); 2493 else 2494 val.u = qualifier != 'L' ? 2495 simple_strtoul(str, &next, base) : 2496 simple_strtoull(str, &next, base); 2497 2498 if (field_width > 0 && next - str > field_width) { 2499 if (base == 0) 2500 _parse_integer_fixup_radix(str, &base); 2501 while (next - str > field_width) { 2502 if (is_sign) 2503 val.s = div_s64(val.s, base); 2504 else 2505 val.u = div_u64(val.u, base); 2506 --next; 2507 } 2508 } 2509 2510 switch (qualifier) { 2511 case 'H': /* that's 'hh' in format */ 2512 if (is_sign) 2513 *va_arg(args, signed char *) = val.s; 2514 else 2515 *va_arg(args, unsigned char *) = val.u; 2516 break; 2517 case 'h': 2518 if (is_sign) 2519 *va_arg(args, short *) = val.s; 2520 else 2521 *va_arg(args, unsigned short *) = val.u; 2522 break; 2523 case 'l': 2524 if (is_sign) 2525 *va_arg(args, long *) = val.s; 2526 else 2527 *va_arg(args, unsigned long *) = val.u; 2528 break; 2529 case 'L': 2530 if (is_sign) 2531 *va_arg(args, long long *) = val.s; 2532 else 2533 *va_arg(args, unsigned long long *) = val.u; 2534 break; 2535 case 'Z': 2536 case 'z': 2537 *va_arg(args, size_t *) = val.u; 2538 break; 2539 default: 2540 if (is_sign) 2541 *va_arg(args, int *) = val.s; 2542 else 2543 *va_arg(args, unsigned int *) = val.u; 2544 break; 2545 } 2546 num++; 2547 2548 if (!next) 2549 break; 2550 str = next; 2551 } 2552 2553 return num; 2554 } 2555 EXPORT_SYMBOL(vsscanf); 2556 2557 /** 2558 * sscanf - Unformat a buffer into a list of arguments 2559 * @buf: input buffer 2560 * @fmt: formatting of buffer 2561 * @...: resulting arguments 2562 */ 2563 int sscanf(const char *buf, const char *fmt, ...) 2564 { 2565 va_list args; 2566 int i; 2567 2568 va_start(args, fmt); 2569 i = vsscanf(buf, fmt, args); 2570 va_end(args); 2571 2572 return i; 2573 } 2574 EXPORT_SYMBOL(sscanf); 2575