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> 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/uaccess.h> 27 #include <linux/ioport.h> 28 #include <net/addrconf.h> 29 30 #include <asm/page.h> /* for PAGE_SIZE */ 31 #include <asm/div64.h> 32 #include <asm/sections.h> /* for dereference_function_descriptor() */ 33 34 #include "kstrtox.h" 35 36 /** 37 * simple_strtoull - convert a string to an unsigned long long 38 * @cp: The start of the string 39 * @endp: A pointer to the end of the parsed string will be placed here 40 * @base: The number base to use 41 */ 42 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) 43 { 44 unsigned long long result; 45 unsigned int rv; 46 47 cp = _parse_integer_fixup_radix(cp, &base); 48 rv = _parse_integer(cp, base, &result); 49 /* FIXME */ 50 cp += (rv & ~KSTRTOX_OVERFLOW); 51 52 if (endp) 53 *endp = (char *)cp; 54 55 return result; 56 } 57 EXPORT_SYMBOL(simple_strtoull); 58 59 /** 60 * simple_strtoul - convert a string to an unsigned long 61 * @cp: The start of the string 62 * @endp: A pointer to the end of the parsed string will be placed here 63 * @base: The number base to use 64 */ 65 unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) 66 { 67 return simple_strtoull(cp, endp, base); 68 } 69 EXPORT_SYMBOL(simple_strtoul); 70 71 /** 72 * simple_strtol - convert a string to a signed long 73 * @cp: The start of the string 74 * @endp: A pointer to the end of the parsed string will be placed here 75 * @base: The number base to use 76 */ 77 long simple_strtol(const char *cp, char **endp, unsigned int base) 78 { 79 if (*cp == '-') 80 return -simple_strtoul(cp + 1, endp, base); 81 82 return simple_strtoul(cp, endp, base); 83 } 84 EXPORT_SYMBOL(simple_strtol); 85 86 /** 87 * simple_strtoll - convert a string to a signed long long 88 * @cp: The start of the string 89 * @endp: A pointer to the end of the parsed string will be placed here 90 * @base: The number base to use 91 */ 92 long long simple_strtoll(const char *cp, char **endp, unsigned int base) 93 { 94 if (*cp == '-') 95 return -simple_strtoull(cp + 1, endp, base); 96 97 return simple_strtoull(cp, endp, base); 98 } 99 EXPORT_SYMBOL(simple_strtoll); 100 101 static noinline_for_stack 102 int skip_atoi(const char **s) 103 { 104 int i = 0; 105 106 while (isdigit(**s)) 107 i = i*10 + *((*s)++) - '0'; 108 109 return i; 110 } 111 112 /* Decimal conversion is by far the most typical, and is used 113 * for /proc and /sys data. This directly impacts e.g. top performance 114 * with many processes running. We optimize it for speed 115 * using code from 116 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html 117 * (with permission from the author, Douglas W. Jones). */ 118 119 /* Formats correctly any integer in [0,99999]. 120 * Outputs from one to five digits depending on input. 121 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */ 122 static noinline_for_stack 123 char *put_dec_trunc(char *buf, unsigned q) 124 { 125 unsigned d3, d2, d1, d0; 126 d1 = (q>>4) & 0xf; 127 d2 = (q>>8) & 0xf; 128 d3 = (q>>12); 129 130 d0 = 6*(d3 + d2 + d1) + (q & 0xf); 131 q = (d0 * 0xcd) >> 11; 132 d0 = d0 - 10*q; 133 *buf++ = d0 + '0'; /* least significant digit */ 134 d1 = q + 9*d3 + 5*d2 + d1; 135 if (d1 != 0) { 136 q = (d1 * 0xcd) >> 11; 137 d1 = d1 - 10*q; 138 *buf++ = d1 + '0'; /* next digit */ 139 140 d2 = q + 2*d2; 141 if ((d2 != 0) || (d3 != 0)) { 142 q = (d2 * 0xd) >> 7; 143 d2 = d2 - 10*q; 144 *buf++ = d2 + '0'; /* next digit */ 145 146 d3 = q + 4*d3; 147 if (d3 != 0) { 148 q = (d3 * 0xcd) >> 11; 149 d3 = d3 - 10*q; 150 *buf++ = d3 + '0'; /* next digit */ 151 if (q != 0) 152 *buf++ = q + '0'; /* most sign. digit */ 153 } 154 } 155 } 156 157 return buf; 158 } 159 /* Same with if's removed. Always emits five digits */ 160 static noinline_for_stack 161 char *put_dec_full(char *buf, unsigned q) 162 { 163 /* BTW, if q is in [0,9999], 8-bit ints will be enough, */ 164 /* but anyway, gcc produces better code with full-sized ints */ 165 unsigned d3, d2, d1, d0; 166 d1 = (q>>4) & 0xf; 167 d2 = (q>>8) & 0xf; 168 d3 = (q>>12); 169 170 /* 171 * Possible ways to approx. divide by 10 172 * gcc -O2 replaces multiply with shifts and adds 173 * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386) 174 * (x * 0x67) >> 10: 1100111 175 * (x * 0x34) >> 9: 110100 - same 176 * (x * 0x1a) >> 8: 11010 - same 177 * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386) 178 */ 179 d0 = 6*(d3 + d2 + d1) + (q & 0xf); 180 q = (d0 * 0xcd) >> 11; 181 d0 = d0 - 10*q; 182 *buf++ = d0 + '0'; 183 d1 = q + 9*d3 + 5*d2 + d1; 184 q = (d1 * 0xcd) >> 11; 185 d1 = d1 - 10*q; 186 *buf++ = d1 + '0'; 187 188 d2 = q + 2*d2; 189 q = (d2 * 0xd) >> 7; 190 d2 = d2 - 10*q; 191 *buf++ = d2 + '0'; 192 193 d3 = q + 4*d3; 194 q = (d3 * 0xcd) >> 11; /* - shorter code */ 195 /* q = (d3 * 0x67) >> 10; - would also work */ 196 d3 = d3 - 10*q; 197 *buf++ = d3 + '0'; 198 *buf++ = q + '0'; 199 200 return buf; 201 } 202 /* No inlining helps gcc to use registers better */ 203 static noinline_for_stack 204 char *put_dec(char *buf, unsigned long long num) 205 { 206 while (1) { 207 unsigned rem; 208 if (num < 100000) 209 return put_dec_trunc(buf, num); 210 rem = do_div(num, 100000); 211 buf = put_dec_full(buf, rem); 212 } 213 } 214 215 #define ZEROPAD 1 /* pad with zero */ 216 #define SIGN 2 /* unsigned/signed long */ 217 #define PLUS 4 /* show plus */ 218 #define SPACE 8 /* space if plus */ 219 #define LEFT 16 /* left justified */ 220 #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ 221 #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ 222 223 enum format_type { 224 FORMAT_TYPE_NONE, /* Just a string part */ 225 FORMAT_TYPE_WIDTH, 226 FORMAT_TYPE_PRECISION, 227 FORMAT_TYPE_CHAR, 228 FORMAT_TYPE_STR, 229 FORMAT_TYPE_PTR, 230 FORMAT_TYPE_PERCENT_CHAR, 231 FORMAT_TYPE_INVALID, 232 FORMAT_TYPE_LONG_LONG, 233 FORMAT_TYPE_ULONG, 234 FORMAT_TYPE_LONG, 235 FORMAT_TYPE_UBYTE, 236 FORMAT_TYPE_BYTE, 237 FORMAT_TYPE_USHORT, 238 FORMAT_TYPE_SHORT, 239 FORMAT_TYPE_UINT, 240 FORMAT_TYPE_INT, 241 FORMAT_TYPE_NRCHARS, 242 FORMAT_TYPE_SIZE_T, 243 FORMAT_TYPE_PTRDIFF 244 }; 245 246 struct printf_spec { 247 u8 type; /* format_type enum */ 248 u8 flags; /* flags to number() */ 249 u8 base; /* number base, 8, 10 or 16 only */ 250 u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */ 251 s16 field_width; /* width of output field */ 252 s16 precision; /* # of digits/chars */ 253 }; 254 255 static noinline_for_stack 256 char *number(char *buf, char *end, unsigned long long num, 257 struct printf_spec spec) 258 { 259 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ 260 static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ 261 262 char tmp[66]; 263 char sign; 264 char locase; 265 int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); 266 int i; 267 268 /* locase = 0 or 0x20. ORing digits or letters with 'locase' 269 * produces same digits or (maybe lowercased) letters */ 270 locase = (spec.flags & SMALL); 271 if (spec.flags & LEFT) 272 spec.flags &= ~ZEROPAD; 273 sign = 0; 274 if (spec.flags & SIGN) { 275 if ((signed long long)num < 0) { 276 sign = '-'; 277 num = -(signed long long)num; 278 spec.field_width--; 279 } else if (spec.flags & PLUS) { 280 sign = '+'; 281 spec.field_width--; 282 } else if (spec.flags & SPACE) { 283 sign = ' '; 284 spec.field_width--; 285 } 286 } 287 if (need_pfx) { 288 spec.field_width--; 289 if (spec.base == 16) 290 spec.field_width--; 291 } 292 293 /* generate full string in tmp[], in reverse order */ 294 i = 0; 295 if (num == 0) 296 tmp[i++] = '0'; 297 /* Generic code, for any base: 298 else do { 299 tmp[i++] = (digits[do_div(num,base)] | locase); 300 } while (num != 0); 301 */ 302 else if (spec.base != 10) { /* 8 or 16 */ 303 int mask = spec.base - 1; 304 int shift = 3; 305 306 if (spec.base == 16) 307 shift = 4; 308 do { 309 tmp[i++] = (digits[((unsigned char)num) & mask] | locase); 310 num >>= shift; 311 } while (num); 312 } else { /* base 10 */ 313 i = put_dec(tmp, num) - tmp; 314 } 315 316 /* printing 100 using %2d gives "100", not "00" */ 317 if (i > spec.precision) 318 spec.precision = i; 319 /* leading space padding */ 320 spec.field_width -= spec.precision; 321 if (!(spec.flags & (ZEROPAD+LEFT))) { 322 while (--spec.field_width >= 0) { 323 if (buf < end) 324 *buf = ' '; 325 ++buf; 326 } 327 } 328 /* sign */ 329 if (sign) { 330 if (buf < end) 331 *buf = sign; 332 ++buf; 333 } 334 /* "0x" / "0" prefix */ 335 if (need_pfx) { 336 if (buf < end) 337 *buf = '0'; 338 ++buf; 339 if (spec.base == 16) { 340 if (buf < end) 341 *buf = ('X' | locase); 342 ++buf; 343 } 344 } 345 /* zero or space padding */ 346 if (!(spec.flags & LEFT)) { 347 char c = (spec.flags & ZEROPAD) ? '0' : ' '; 348 while (--spec.field_width >= 0) { 349 if (buf < end) 350 *buf = c; 351 ++buf; 352 } 353 } 354 /* hmm even more zero padding? */ 355 while (i <= --spec.precision) { 356 if (buf < end) 357 *buf = '0'; 358 ++buf; 359 } 360 /* actual digits of result */ 361 while (--i >= 0) { 362 if (buf < end) 363 *buf = tmp[i]; 364 ++buf; 365 } 366 /* trailing space padding */ 367 while (--spec.field_width >= 0) { 368 if (buf < end) 369 *buf = ' '; 370 ++buf; 371 } 372 373 return buf; 374 } 375 376 static noinline_for_stack 377 char *string(char *buf, char *end, const char *s, struct printf_spec spec) 378 { 379 int len, i; 380 381 if ((unsigned long)s < PAGE_SIZE) 382 s = "(null)"; 383 384 len = strnlen(s, spec.precision); 385 386 if (!(spec.flags & LEFT)) { 387 while (len < spec.field_width--) { 388 if (buf < end) 389 *buf = ' '; 390 ++buf; 391 } 392 } 393 for (i = 0; i < len; ++i) { 394 if (buf < end) 395 *buf = *s; 396 ++buf; ++s; 397 } 398 while (len < spec.field_width--) { 399 if (buf < end) 400 *buf = ' '; 401 ++buf; 402 } 403 404 return buf; 405 } 406 407 static noinline_for_stack 408 char *symbol_string(char *buf, char *end, void *ptr, 409 struct printf_spec spec, char ext) 410 { 411 unsigned long value = (unsigned long) ptr; 412 #ifdef CONFIG_KALLSYMS 413 char sym[KSYM_SYMBOL_LEN]; 414 if (ext == 'B') 415 sprint_backtrace(sym, value); 416 else if (ext != 'f' && ext != 's') 417 sprint_symbol(sym, value); 418 else 419 kallsyms_lookup(value, NULL, NULL, NULL, sym); 420 421 return string(buf, end, sym, spec); 422 #else 423 spec.field_width = 2 * sizeof(void *); 424 spec.flags |= SPECIAL | SMALL | ZEROPAD; 425 spec.base = 16; 426 427 return number(buf, end, value, spec); 428 #endif 429 } 430 431 static noinline_for_stack 432 char *resource_string(char *buf, char *end, struct resource *res, 433 struct printf_spec spec, const char *fmt) 434 { 435 #ifndef IO_RSRC_PRINTK_SIZE 436 #define IO_RSRC_PRINTK_SIZE 6 437 #endif 438 439 #ifndef MEM_RSRC_PRINTK_SIZE 440 #define MEM_RSRC_PRINTK_SIZE 10 441 #endif 442 static const struct printf_spec io_spec = { 443 .base = 16, 444 .field_width = IO_RSRC_PRINTK_SIZE, 445 .precision = -1, 446 .flags = SPECIAL | SMALL | ZEROPAD, 447 }; 448 static const struct printf_spec mem_spec = { 449 .base = 16, 450 .field_width = MEM_RSRC_PRINTK_SIZE, 451 .precision = -1, 452 .flags = SPECIAL | SMALL | ZEROPAD, 453 }; 454 static const struct printf_spec bus_spec = { 455 .base = 16, 456 .field_width = 2, 457 .precision = -1, 458 .flags = SMALL | ZEROPAD, 459 }; 460 static const struct printf_spec dec_spec = { 461 .base = 10, 462 .precision = -1, 463 .flags = 0, 464 }; 465 static const struct printf_spec str_spec = { 466 .field_width = -1, 467 .precision = 10, 468 .flags = LEFT, 469 }; 470 static const struct printf_spec flag_spec = { 471 .base = 16, 472 .precision = -1, 473 .flags = SPECIAL | SMALL, 474 }; 475 476 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) 477 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ 478 #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) 479 #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) 480 #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") 481 #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") 482 char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, 483 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; 484 485 char *p = sym, *pend = sym + sizeof(sym); 486 int decode = (fmt[0] == 'R') ? 1 : 0; 487 const struct printf_spec *specp; 488 489 *p++ = '['; 490 if (res->flags & IORESOURCE_IO) { 491 p = string(p, pend, "io ", str_spec); 492 specp = &io_spec; 493 } else if (res->flags & IORESOURCE_MEM) { 494 p = string(p, pend, "mem ", str_spec); 495 specp = &mem_spec; 496 } else if (res->flags & IORESOURCE_IRQ) { 497 p = string(p, pend, "irq ", str_spec); 498 specp = &dec_spec; 499 } else if (res->flags & IORESOURCE_DMA) { 500 p = string(p, pend, "dma ", str_spec); 501 specp = &dec_spec; 502 } else if (res->flags & IORESOURCE_BUS) { 503 p = string(p, pend, "bus ", str_spec); 504 specp = &bus_spec; 505 } else { 506 p = string(p, pend, "??? ", str_spec); 507 specp = &mem_spec; 508 decode = 0; 509 } 510 p = number(p, pend, res->start, *specp); 511 if (res->start != res->end) { 512 *p++ = '-'; 513 p = number(p, pend, res->end, *specp); 514 } 515 if (decode) { 516 if (res->flags & IORESOURCE_MEM_64) 517 p = string(p, pend, " 64bit", str_spec); 518 if (res->flags & IORESOURCE_PREFETCH) 519 p = string(p, pend, " pref", str_spec); 520 if (res->flags & IORESOURCE_WINDOW) 521 p = string(p, pend, " window", str_spec); 522 if (res->flags & IORESOURCE_DISABLED) 523 p = string(p, pend, " disabled", str_spec); 524 } else { 525 p = string(p, pend, " flags ", str_spec); 526 p = number(p, pend, res->flags, flag_spec); 527 } 528 *p++ = ']'; 529 *p = '\0'; 530 531 return string(buf, end, sym, spec); 532 } 533 534 static noinline_for_stack 535 char *mac_address_string(char *buf, char *end, u8 *addr, 536 struct printf_spec spec, const char *fmt) 537 { 538 char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; 539 char *p = mac_addr; 540 int i; 541 char separator; 542 543 if (fmt[1] == 'F') { /* FDDI canonical format */ 544 separator = '-'; 545 } else { 546 separator = ':'; 547 } 548 549 for (i = 0; i < 6; i++) { 550 p = hex_byte_pack(p, addr[i]); 551 if (fmt[0] == 'M' && i != 5) 552 *p++ = separator; 553 } 554 *p = '\0'; 555 556 return string(buf, end, mac_addr, spec); 557 } 558 559 static noinline_for_stack 560 char *ip4_string(char *p, const u8 *addr, const char *fmt) 561 { 562 int i; 563 bool leading_zeros = (fmt[0] == 'i'); 564 int index; 565 int step; 566 567 switch (fmt[2]) { 568 case 'h': 569 #ifdef __BIG_ENDIAN 570 index = 0; 571 step = 1; 572 #else 573 index = 3; 574 step = -1; 575 #endif 576 break; 577 case 'l': 578 index = 3; 579 step = -1; 580 break; 581 case 'n': 582 case 'b': 583 default: 584 index = 0; 585 step = 1; 586 break; 587 } 588 for (i = 0; i < 4; i++) { 589 char temp[3]; /* hold each IP quad in reverse order */ 590 int digits = put_dec_trunc(temp, addr[index]) - temp; 591 if (leading_zeros) { 592 if (digits < 3) 593 *p++ = '0'; 594 if (digits < 2) 595 *p++ = '0'; 596 } 597 /* reverse the digits in the quad */ 598 while (digits--) 599 *p++ = temp[digits]; 600 if (i < 3) 601 *p++ = '.'; 602 index += step; 603 } 604 *p = '\0'; 605 606 return p; 607 } 608 609 static noinline_for_stack 610 char *ip6_compressed_string(char *p, const char *addr) 611 { 612 int i, j, range; 613 unsigned char zerolength[8]; 614 int longest = 1; 615 int colonpos = -1; 616 u16 word; 617 u8 hi, lo; 618 bool needcolon = false; 619 bool useIPv4; 620 struct in6_addr in6; 621 622 memcpy(&in6, addr, sizeof(struct in6_addr)); 623 624 useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); 625 626 memset(zerolength, 0, sizeof(zerolength)); 627 628 if (useIPv4) 629 range = 6; 630 else 631 range = 8; 632 633 /* find position of longest 0 run */ 634 for (i = 0; i < range; i++) { 635 for (j = i; j < range; j++) { 636 if (in6.s6_addr16[j] != 0) 637 break; 638 zerolength[i]++; 639 } 640 } 641 for (i = 0; i < range; i++) { 642 if (zerolength[i] > longest) { 643 longest = zerolength[i]; 644 colonpos = i; 645 } 646 } 647 if (longest == 1) /* don't compress a single 0 */ 648 colonpos = -1; 649 650 /* emit address */ 651 for (i = 0; i < range; i++) { 652 if (i == colonpos) { 653 if (needcolon || i == 0) 654 *p++ = ':'; 655 *p++ = ':'; 656 needcolon = false; 657 i += longest - 1; 658 continue; 659 } 660 if (needcolon) { 661 *p++ = ':'; 662 needcolon = false; 663 } 664 /* hex u16 without leading 0s */ 665 word = ntohs(in6.s6_addr16[i]); 666 hi = word >> 8; 667 lo = word & 0xff; 668 if (hi) { 669 if (hi > 0x0f) 670 p = hex_byte_pack(p, hi); 671 else 672 *p++ = hex_asc_lo(hi); 673 p = hex_byte_pack(p, lo); 674 } 675 else if (lo > 0x0f) 676 p = hex_byte_pack(p, lo); 677 else 678 *p++ = hex_asc_lo(lo); 679 needcolon = true; 680 } 681 682 if (useIPv4) { 683 if (needcolon) 684 *p++ = ':'; 685 p = ip4_string(p, &in6.s6_addr[12], "I4"); 686 } 687 *p = '\0'; 688 689 return p; 690 } 691 692 static noinline_for_stack 693 char *ip6_string(char *p, const char *addr, const char *fmt) 694 { 695 int i; 696 697 for (i = 0; i < 8; i++) { 698 p = hex_byte_pack(p, *addr++); 699 p = hex_byte_pack(p, *addr++); 700 if (fmt[0] == 'I' && i != 7) 701 *p++ = ':'; 702 } 703 *p = '\0'; 704 705 return p; 706 } 707 708 static noinline_for_stack 709 char *ip6_addr_string(char *buf, char *end, const u8 *addr, 710 struct printf_spec spec, const char *fmt) 711 { 712 char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; 713 714 if (fmt[0] == 'I' && fmt[2] == 'c') 715 ip6_compressed_string(ip6_addr, addr); 716 else 717 ip6_string(ip6_addr, addr, fmt); 718 719 return string(buf, end, ip6_addr, spec); 720 } 721 722 static noinline_for_stack 723 char *ip4_addr_string(char *buf, char *end, const u8 *addr, 724 struct printf_spec spec, const char *fmt) 725 { 726 char ip4_addr[sizeof("255.255.255.255")]; 727 728 ip4_string(ip4_addr, addr, fmt); 729 730 return string(buf, end, ip4_addr, spec); 731 } 732 733 static noinline_for_stack 734 char *uuid_string(char *buf, char *end, const u8 *addr, 735 struct printf_spec spec, const char *fmt) 736 { 737 char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; 738 char *p = uuid; 739 int i; 740 static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; 741 static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; 742 const u8 *index = be; 743 bool uc = false; 744 745 switch (*(++fmt)) { 746 case 'L': 747 uc = true; /* fall-through */ 748 case 'l': 749 index = le; 750 break; 751 case 'B': 752 uc = true; 753 break; 754 } 755 756 for (i = 0; i < 16; i++) { 757 p = hex_byte_pack(p, addr[index[i]]); 758 switch (i) { 759 case 3: 760 case 5: 761 case 7: 762 case 9: 763 *p++ = '-'; 764 break; 765 } 766 } 767 768 *p = 0; 769 770 if (uc) { 771 p = uuid; 772 do { 773 *p = toupper(*p); 774 } while (*(++p)); 775 } 776 777 return string(buf, end, uuid, spec); 778 } 779 780 int kptr_restrict __read_mostly; 781 782 /* 783 * Show a '%p' thing. A kernel extension is that the '%p' is followed 784 * by an extra set of alphanumeric characters that are extended format 785 * specifiers. 786 * 787 * Right now we handle: 788 * 789 * - 'F' For symbolic function descriptor pointers with offset 790 * - 'f' For simple symbolic function names without offset 791 * - 'S' For symbolic direct pointers with offset 792 * - 's' For symbolic direct pointers without offset 793 * - 'B' For backtraced symbolic direct pointers with offset 794 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] 795 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] 796 * - 'M' For a 6-byte MAC address, it prints the address in the 797 * usual colon-separated hex notation 798 * - 'm' For a 6-byte MAC address, it prints the hex address without colons 799 * - 'MF' For a 6-byte MAC FDDI address, it prints the address 800 * with a dash-separated hex notation 801 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way 802 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) 803 * IPv6 uses colon separated network-order 16 bit hex with leading 0's 804 * - 'i' [46] for 'raw' IPv4/IPv6 addresses 805 * IPv6 omits the colons (01020304...0f) 806 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) 807 * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order 808 * - 'I6c' for IPv6 addresses printed as specified by 809 * http://tools.ietf.org/html/rfc5952 810 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form 811 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" 812 * Options for %pU are: 813 * b big endian lower case hex (default) 814 * B big endian UPPER case hex 815 * l little endian lower case hex 816 * L little endian UPPER case hex 817 * big endian output byte order is: 818 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] 819 * little endian output byte order is: 820 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] 821 * - 'V' For a struct va_format which contains a format string * and va_list *, 822 * call vsnprintf(->format, *->va_list). 823 * Implements a "recursive vsnprintf". 824 * Do not use this feature without some mechanism to verify the 825 * correctness of the format string and va_list arguments. 826 * - 'K' For a kernel pointer that should be hidden from unprivileged users 827 * 828 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 829 * function pointers are really function descriptors, which contain a 830 * pointer to the real address. 831 */ 832 static noinline_for_stack 833 char *pointer(const char *fmt, char *buf, char *end, void *ptr, 834 struct printf_spec spec) 835 { 836 if (!ptr && *fmt != 'K') { 837 /* 838 * Print (null) with the same width as a pointer so it makes 839 * tabular output look nice. 840 */ 841 if (spec.field_width == -1) 842 spec.field_width = 2 * sizeof(void *); 843 return string(buf, end, "(null)", spec); 844 } 845 846 switch (*fmt) { 847 case 'F': 848 case 'f': 849 ptr = dereference_function_descriptor(ptr); 850 /* Fallthrough */ 851 case 'S': 852 case 's': 853 case 'B': 854 return symbol_string(buf, end, ptr, spec, *fmt); 855 case 'R': 856 case 'r': 857 return resource_string(buf, end, ptr, spec, fmt); 858 case 'M': /* Colon separated: 00:01:02:03:04:05 */ 859 case 'm': /* Contiguous: 000102030405 */ 860 /* [mM]F (FDDI, bit reversed) */ 861 return mac_address_string(buf, end, ptr, spec, fmt); 862 case 'I': /* Formatted IP supported 863 * 4: 1.2.3.4 864 * 6: 0001:0203:...:0708 865 * 6c: 1::708 or 1::1.2.3.4 866 */ 867 case 'i': /* Contiguous: 868 * 4: 001.002.003.004 869 * 6: 000102...0f 870 */ 871 switch (fmt[1]) { 872 case '6': 873 return ip6_addr_string(buf, end, ptr, spec, fmt); 874 case '4': 875 return ip4_addr_string(buf, end, ptr, spec, fmt); 876 } 877 break; 878 case 'U': 879 return uuid_string(buf, end, ptr, spec, fmt); 880 case 'V': 881 return buf + vsnprintf(buf, end > buf ? end - buf : 0, 882 ((struct va_format *)ptr)->fmt, 883 *(((struct va_format *)ptr)->va)); 884 case 'K': 885 /* 886 * %pK cannot be used in IRQ context because its test 887 * for CAP_SYSLOG would be meaningless. 888 */ 889 if (in_irq() || in_serving_softirq() || in_nmi()) { 890 if (spec.field_width == -1) 891 spec.field_width = 2 * sizeof(void *); 892 return string(buf, end, "pK-error", spec); 893 } 894 if (!((kptr_restrict == 0) || 895 (kptr_restrict == 1 && 896 has_capability_noaudit(current, CAP_SYSLOG)))) 897 ptr = NULL; 898 break; 899 } 900 spec.flags |= SMALL; 901 if (spec.field_width == -1) { 902 spec.field_width = 2 * sizeof(void *); 903 spec.flags |= ZEROPAD; 904 } 905 spec.base = 16; 906 907 return number(buf, end, (unsigned long) ptr, spec); 908 } 909 910 /* 911 * Helper function to decode printf style format. 912 * Each call decode a token from the format and return the 913 * number of characters read (or likely the delta where it wants 914 * to go on the next call). 915 * The decoded token is returned through the parameters 916 * 917 * 'h', 'l', or 'L' for integer fields 918 * 'z' support added 23/7/1999 S.H. 919 * 'z' changed to 'Z' --davidm 1/25/99 920 * 't' added for ptrdiff_t 921 * 922 * @fmt: the format string 923 * @type of the token returned 924 * @flags: various flags such as +, -, # tokens.. 925 * @field_width: overwritten width 926 * @base: base of the number (octal, hex, ...) 927 * @precision: precision of a number 928 * @qualifier: qualifier of a number (long, size_t, ...) 929 */ 930 static noinline_for_stack 931 int format_decode(const char *fmt, struct printf_spec *spec) 932 { 933 const char *start = fmt; 934 935 /* we finished early by reading the field width */ 936 if (spec->type == FORMAT_TYPE_WIDTH) { 937 if (spec->field_width < 0) { 938 spec->field_width = -spec->field_width; 939 spec->flags |= LEFT; 940 } 941 spec->type = FORMAT_TYPE_NONE; 942 goto precision; 943 } 944 945 /* we finished early by reading the precision */ 946 if (spec->type == FORMAT_TYPE_PRECISION) { 947 if (spec->precision < 0) 948 spec->precision = 0; 949 950 spec->type = FORMAT_TYPE_NONE; 951 goto qualifier; 952 } 953 954 /* By default */ 955 spec->type = FORMAT_TYPE_NONE; 956 957 for (; *fmt ; ++fmt) { 958 if (*fmt == '%') 959 break; 960 } 961 962 /* Return the current non-format string */ 963 if (fmt != start || !*fmt) 964 return fmt - start; 965 966 /* Process flags */ 967 spec->flags = 0; 968 969 while (1) { /* this also skips first '%' */ 970 bool found = true; 971 972 ++fmt; 973 974 switch (*fmt) { 975 case '-': spec->flags |= LEFT; break; 976 case '+': spec->flags |= PLUS; break; 977 case ' ': spec->flags |= SPACE; break; 978 case '#': spec->flags |= SPECIAL; break; 979 case '0': spec->flags |= ZEROPAD; break; 980 default: found = false; 981 } 982 983 if (!found) 984 break; 985 } 986 987 /* get field width */ 988 spec->field_width = -1; 989 990 if (isdigit(*fmt)) 991 spec->field_width = skip_atoi(&fmt); 992 else if (*fmt == '*') { 993 /* it's the next argument */ 994 spec->type = FORMAT_TYPE_WIDTH; 995 return ++fmt - start; 996 } 997 998 precision: 999 /* get the precision */ 1000 spec->precision = -1; 1001 if (*fmt == '.') { 1002 ++fmt; 1003 if (isdigit(*fmt)) { 1004 spec->precision = skip_atoi(&fmt); 1005 if (spec->precision < 0) 1006 spec->precision = 0; 1007 } else if (*fmt == '*') { 1008 /* it's the next argument */ 1009 spec->type = FORMAT_TYPE_PRECISION; 1010 return ++fmt - start; 1011 } 1012 } 1013 1014 qualifier: 1015 /* get the conversion qualifier */ 1016 spec->qualifier = -1; 1017 if (*fmt == 'h' || _tolower(*fmt) == 'l' || 1018 _tolower(*fmt) == 'z' || *fmt == 't') { 1019 spec->qualifier = *fmt++; 1020 if (unlikely(spec->qualifier == *fmt)) { 1021 if (spec->qualifier == 'l') { 1022 spec->qualifier = 'L'; 1023 ++fmt; 1024 } else if (spec->qualifier == 'h') { 1025 spec->qualifier = 'H'; 1026 ++fmt; 1027 } 1028 } 1029 } 1030 1031 /* default base */ 1032 spec->base = 10; 1033 switch (*fmt) { 1034 case 'c': 1035 spec->type = FORMAT_TYPE_CHAR; 1036 return ++fmt - start; 1037 1038 case 's': 1039 spec->type = FORMAT_TYPE_STR; 1040 return ++fmt - start; 1041 1042 case 'p': 1043 spec->type = FORMAT_TYPE_PTR; 1044 return fmt - start; 1045 /* skip alnum */ 1046 1047 case 'n': 1048 spec->type = FORMAT_TYPE_NRCHARS; 1049 return ++fmt - start; 1050 1051 case '%': 1052 spec->type = FORMAT_TYPE_PERCENT_CHAR; 1053 return ++fmt - start; 1054 1055 /* integer number formats - set up the flags and "break" */ 1056 case 'o': 1057 spec->base = 8; 1058 break; 1059 1060 case 'x': 1061 spec->flags |= SMALL; 1062 1063 case 'X': 1064 spec->base = 16; 1065 break; 1066 1067 case 'd': 1068 case 'i': 1069 spec->flags |= SIGN; 1070 case 'u': 1071 break; 1072 1073 default: 1074 spec->type = FORMAT_TYPE_INVALID; 1075 return fmt - start; 1076 } 1077 1078 if (spec->qualifier == 'L') 1079 spec->type = FORMAT_TYPE_LONG_LONG; 1080 else if (spec->qualifier == 'l') { 1081 if (spec->flags & SIGN) 1082 spec->type = FORMAT_TYPE_LONG; 1083 else 1084 spec->type = FORMAT_TYPE_ULONG; 1085 } else if (_tolower(spec->qualifier) == 'z') { 1086 spec->type = FORMAT_TYPE_SIZE_T; 1087 } else if (spec->qualifier == 't') { 1088 spec->type = FORMAT_TYPE_PTRDIFF; 1089 } else if (spec->qualifier == 'H') { 1090 if (spec->flags & SIGN) 1091 spec->type = FORMAT_TYPE_BYTE; 1092 else 1093 spec->type = FORMAT_TYPE_UBYTE; 1094 } else if (spec->qualifier == 'h') { 1095 if (spec->flags & SIGN) 1096 spec->type = FORMAT_TYPE_SHORT; 1097 else 1098 spec->type = FORMAT_TYPE_USHORT; 1099 } else { 1100 if (spec->flags & SIGN) 1101 spec->type = FORMAT_TYPE_INT; 1102 else 1103 spec->type = FORMAT_TYPE_UINT; 1104 } 1105 1106 return ++fmt - start; 1107 } 1108 1109 /** 1110 * vsnprintf - Format a string and place it in a buffer 1111 * @buf: The buffer to place the result into 1112 * @size: The size of the buffer, including the trailing null space 1113 * @fmt: The format string to use 1114 * @args: Arguments for the format string 1115 * 1116 * This function follows C99 vsnprintf, but has some extensions: 1117 * %pS output the name of a text symbol with offset 1118 * %ps output the name of a text symbol without offset 1119 * %pF output the name of a function pointer with its offset 1120 * %pf output the name of a function pointer without its offset 1121 * %pB output the name of a backtrace symbol with its offset 1122 * %pR output the address range in a struct resource with decoded flags 1123 * %pr output the address range in a struct resource with raw flags 1124 * %pM output a 6-byte MAC address with colons 1125 * %pm output a 6-byte MAC address without colons 1126 * %pI4 print an IPv4 address without leading zeros 1127 * %pi4 print an IPv4 address with leading zeros 1128 * %pI6 print an IPv6 address with colons 1129 * %pi6 print an IPv6 address without colons 1130 * %pI6c print an IPv6 address as specified by RFC 5952 1131 * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper 1132 * case. 1133 * %n is ignored 1134 * 1135 * The return value is the number of characters which would 1136 * be generated for the given input, excluding the trailing 1137 * '\0', as per ISO C99. If you want to have the exact 1138 * number of characters written into @buf as return value 1139 * (not including the trailing '\0'), use vscnprintf(). If the 1140 * return is greater than or equal to @size, the resulting 1141 * string is truncated. 1142 * 1143 * If you're not already dealing with a va_list consider using snprintf(). 1144 */ 1145 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) 1146 { 1147 unsigned long long num; 1148 char *str, *end; 1149 struct printf_spec spec = {0}; 1150 1151 /* Reject out-of-range values early. Large positive sizes are 1152 used for unknown buffer sizes. */ 1153 if (WARN_ON_ONCE((int) size < 0)) 1154 return 0; 1155 1156 str = buf; 1157 end = buf + size; 1158 1159 /* Make sure end is always >= buf */ 1160 if (end < buf) { 1161 end = ((void *)-1); 1162 size = end - buf; 1163 } 1164 1165 while (*fmt) { 1166 const char *old_fmt = fmt; 1167 int read = format_decode(fmt, &spec); 1168 1169 fmt += read; 1170 1171 switch (spec.type) { 1172 case FORMAT_TYPE_NONE: { 1173 int copy = read; 1174 if (str < end) { 1175 if (copy > end - str) 1176 copy = end - str; 1177 memcpy(str, old_fmt, copy); 1178 } 1179 str += read; 1180 break; 1181 } 1182 1183 case FORMAT_TYPE_WIDTH: 1184 spec.field_width = va_arg(args, int); 1185 break; 1186 1187 case FORMAT_TYPE_PRECISION: 1188 spec.precision = va_arg(args, int); 1189 break; 1190 1191 case FORMAT_TYPE_CHAR: { 1192 char c; 1193 1194 if (!(spec.flags & LEFT)) { 1195 while (--spec.field_width > 0) { 1196 if (str < end) 1197 *str = ' '; 1198 ++str; 1199 1200 } 1201 } 1202 c = (unsigned char) va_arg(args, int); 1203 if (str < end) 1204 *str = c; 1205 ++str; 1206 while (--spec.field_width > 0) { 1207 if (str < end) 1208 *str = ' '; 1209 ++str; 1210 } 1211 break; 1212 } 1213 1214 case FORMAT_TYPE_STR: 1215 str = string(str, end, va_arg(args, char *), spec); 1216 break; 1217 1218 case FORMAT_TYPE_PTR: 1219 str = pointer(fmt+1, str, end, va_arg(args, void *), 1220 spec); 1221 while (isalnum(*fmt)) 1222 fmt++; 1223 break; 1224 1225 case FORMAT_TYPE_PERCENT_CHAR: 1226 if (str < end) 1227 *str = '%'; 1228 ++str; 1229 break; 1230 1231 case FORMAT_TYPE_INVALID: 1232 if (str < end) 1233 *str = '%'; 1234 ++str; 1235 break; 1236 1237 case FORMAT_TYPE_NRCHARS: { 1238 u8 qualifier = spec.qualifier; 1239 1240 if (qualifier == 'l') { 1241 long *ip = va_arg(args, long *); 1242 *ip = (str - buf); 1243 } else if (_tolower(qualifier) == 'z') { 1244 size_t *ip = va_arg(args, size_t *); 1245 *ip = (str - buf); 1246 } else { 1247 int *ip = va_arg(args, int *); 1248 *ip = (str - buf); 1249 } 1250 break; 1251 } 1252 1253 default: 1254 switch (spec.type) { 1255 case FORMAT_TYPE_LONG_LONG: 1256 num = va_arg(args, long long); 1257 break; 1258 case FORMAT_TYPE_ULONG: 1259 num = va_arg(args, unsigned long); 1260 break; 1261 case FORMAT_TYPE_LONG: 1262 num = va_arg(args, long); 1263 break; 1264 case FORMAT_TYPE_SIZE_T: 1265 num = va_arg(args, size_t); 1266 break; 1267 case FORMAT_TYPE_PTRDIFF: 1268 num = va_arg(args, ptrdiff_t); 1269 break; 1270 case FORMAT_TYPE_UBYTE: 1271 num = (unsigned char) va_arg(args, int); 1272 break; 1273 case FORMAT_TYPE_BYTE: 1274 num = (signed char) va_arg(args, int); 1275 break; 1276 case FORMAT_TYPE_USHORT: 1277 num = (unsigned short) va_arg(args, int); 1278 break; 1279 case FORMAT_TYPE_SHORT: 1280 num = (short) va_arg(args, int); 1281 break; 1282 case FORMAT_TYPE_INT: 1283 num = (int) va_arg(args, int); 1284 break; 1285 default: 1286 num = va_arg(args, unsigned int); 1287 } 1288 1289 str = number(str, end, num, spec); 1290 } 1291 } 1292 1293 if (size > 0) { 1294 if (str < end) 1295 *str = '\0'; 1296 else 1297 end[-1] = '\0'; 1298 } 1299 1300 /* the trailing null byte doesn't count towards the total */ 1301 return str-buf; 1302 1303 } 1304 EXPORT_SYMBOL(vsnprintf); 1305 1306 /** 1307 * vscnprintf - Format a string and place it in a buffer 1308 * @buf: The buffer to place the result into 1309 * @size: The size of the buffer, including the trailing null space 1310 * @fmt: The format string to use 1311 * @args: Arguments for the format string 1312 * 1313 * The return value is the number of characters which have been written into 1314 * the @buf not including the trailing '\0'. If @size is == 0 the function 1315 * returns 0. 1316 * 1317 * If you're not already dealing with a va_list consider using scnprintf(). 1318 * 1319 * See the vsnprintf() documentation for format string extensions over C99. 1320 */ 1321 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) 1322 { 1323 int i; 1324 1325 i = vsnprintf(buf, size, fmt, args); 1326 1327 if (likely(i < size)) 1328 return i; 1329 if (size != 0) 1330 return size - 1; 1331 return 0; 1332 } 1333 EXPORT_SYMBOL(vscnprintf); 1334 1335 /** 1336 * snprintf - Format a string and place it in a buffer 1337 * @buf: The buffer to place the result into 1338 * @size: The size of the buffer, including the trailing null space 1339 * @fmt: The format string to use 1340 * @...: Arguments for the format string 1341 * 1342 * The return value is the number of characters which would be 1343 * generated for the given input, excluding the trailing null, 1344 * as per ISO C99. If the return is greater than or equal to 1345 * @size, the resulting string is truncated. 1346 * 1347 * See the vsnprintf() documentation for format string extensions over C99. 1348 */ 1349 int snprintf(char *buf, size_t size, const char *fmt, ...) 1350 { 1351 va_list args; 1352 int i; 1353 1354 va_start(args, fmt); 1355 i = vsnprintf(buf, size, fmt, args); 1356 va_end(args); 1357 1358 return i; 1359 } 1360 EXPORT_SYMBOL(snprintf); 1361 1362 /** 1363 * scnprintf - Format a string and place it in a buffer 1364 * @buf: The buffer to place the result into 1365 * @size: The size of the buffer, including the trailing null space 1366 * @fmt: The format string to use 1367 * @...: Arguments for the format string 1368 * 1369 * The return value is the number of characters written into @buf not including 1370 * the trailing '\0'. If @size is == 0 the function returns 0. 1371 */ 1372 1373 int scnprintf(char *buf, size_t size, const char *fmt, ...) 1374 { 1375 va_list args; 1376 int i; 1377 1378 va_start(args, fmt); 1379 i = vscnprintf(buf, size, fmt, args); 1380 va_end(args); 1381 1382 return i; 1383 } 1384 EXPORT_SYMBOL(scnprintf); 1385 1386 /** 1387 * vsprintf - Format a string and place it in a buffer 1388 * @buf: The buffer to place the result into 1389 * @fmt: The format string to use 1390 * @args: Arguments for the format string 1391 * 1392 * The function returns the number of characters written 1393 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid 1394 * buffer overflows. 1395 * 1396 * If you're not already dealing with a va_list consider using sprintf(). 1397 * 1398 * See the vsnprintf() documentation for format string extensions over C99. 1399 */ 1400 int vsprintf(char *buf, const char *fmt, va_list args) 1401 { 1402 return vsnprintf(buf, INT_MAX, fmt, args); 1403 } 1404 EXPORT_SYMBOL(vsprintf); 1405 1406 /** 1407 * sprintf - Format a string and place it in a buffer 1408 * @buf: The buffer to place the result into 1409 * @fmt: The format string to use 1410 * @...: Arguments for the format string 1411 * 1412 * The function returns the number of characters written 1413 * into @buf. Use snprintf() or scnprintf() in order to avoid 1414 * buffer overflows. 1415 * 1416 * See the vsnprintf() documentation for format string extensions over C99. 1417 */ 1418 int sprintf(char *buf, const char *fmt, ...) 1419 { 1420 va_list args; 1421 int i; 1422 1423 va_start(args, fmt); 1424 i = vsnprintf(buf, INT_MAX, fmt, args); 1425 va_end(args); 1426 1427 return i; 1428 } 1429 EXPORT_SYMBOL(sprintf); 1430 1431 #ifdef CONFIG_BINARY_PRINTF 1432 /* 1433 * bprintf service: 1434 * vbin_printf() - VA arguments to binary data 1435 * bstr_printf() - Binary data to text string 1436 */ 1437 1438 /** 1439 * vbin_printf - Parse a format string and place args' binary value in a buffer 1440 * @bin_buf: The buffer to place args' binary value 1441 * @size: The size of the buffer(by words(32bits), not characters) 1442 * @fmt: The format string to use 1443 * @args: Arguments for the format string 1444 * 1445 * The format follows C99 vsnprintf, except %n is ignored, and its argument 1446 * is skiped. 1447 * 1448 * The return value is the number of words(32bits) which would be generated for 1449 * the given input. 1450 * 1451 * NOTE: 1452 * If the return value is greater than @size, the resulting bin_buf is NOT 1453 * valid for bstr_printf(). 1454 */ 1455 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) 1456 { 1457 struct printf_spec spec = {0}; 1458 char *str, *end; 1459 1460 str = (char *)bin_buf; 1461 end = (char *)(bin_buf + size); 1462 1463 #define save_arg(type) \ 1464 do { \ 1465 if (sizeof(type) == 8) { \ 1466 unsigned long long value; \ 1467 str = PTR_ALIGN(str, sizeof(u32)); \ 1468 value = va_arg(args, unsigned long long); \ 1469 if (str + sizeof(type) <= end) { \ 1470 *(u32 *)str = *(u32 *)&value; \ 1471 *(u32 *)(str + 4) = *((u32 *)&value + 1); \ 1472 } \ 1473 } else { \ 1474 unsigned long value; \ 1475 str = PTR_ALIGN(str, sizeof(type)); \ 1476 value = va_arg(args, int); \ 1477 if (str + sizeof(type) <= end) \ 1478 *(typeof(type) *)str = (type)value; \ 1479 } \ 1480 str += sizeof(type); \ 1481 } while (0) 1482 1483 while (*fmt) { 1484 int read = format_decode(fmt, &spec); 1485 1486 fmt += read; 1487 1488 switch (spec.type) { 1489 case FORMAT_TYPE_NONE: 1490 case FORMAT_TYPE_INVALID: 1491 case FORMAT_TYPE_PERCENT_CHAR: 1492 break; 1493 1494 case FORMAT_TYPE_WIDTH: 1495 case FORMAT_TYPE_PRECISION: 1496 save_arg(int); 1497 break; 1498 1499 case FORMAT_TYPE_CHAR: 1500 save_arg(char); 1501 break; 1502 1503 case FORMAT_TYPE_STR: { 1504 const char *save_str = va_arg(args, char *); 1505 size_t len; 1506 1507 if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE 1508 || (unsigned long)save_str < PAGE_SIZE) 1509 save_str = "(null)"; 1510 len = strlen(save_str) + 1; 1511 if (str + len < end) 1512 memcpy(str, save_str, len); 1513 str += len; 1514 break; 1515 } 1516 1517 case FORMAT_TYPE_PTR: 1518 save_arg(void *); 1519 /* skip all alphanumeric pointer suffixes */ 1520 while (isalnum(*fmt)) 1521 fmt++; 1522 break; 1523 1524 case FORMAT_TYPE_NRCHARS: { 1525 /* skip %n 's argument */ 1526 u8 qualifier = spec.qualifier; 1527 void *skip_arg; 1528 if (qualifier == 'l') 1529 skip_arg = va_arg(args, long *); 1530 else if (_tolower(qualifier) == 'z') 1531 skip_arg = va_arg(args, size_t *); 1532 else 1533 skip_arg = va_arg(args, int *); 1534 break; 1535 } 1536 1537 default: 1538 switch (spec.type) { 1539 1540 case FORMAT_TYPE_LONG_LONG: 1541 save_arg(long long); 1542 break; 1543 case FORMAT_TYPE_ULONG: 1544 case FORMAT_TYPE_LONG: 1545 save_arg(unsigned long); 1546 break; 1547 case FORMAT_TYPE_SIZE_T: 1548 save_arg(size_t); 1549 break; 1550 case FORMAT_TYPE_PTRDIFF: 1551 save_arg(ptrdiff_t); 1552 break; 1553 case FORMAT_TYPE_UBYTE: 1554 case FORMAT_TYPE_BYTE: 1555 save_arg(char); 1556 break; 1557 case FORMAT_TYPE_USHORT: 1558 case FORMAT_TYPE_SHORT: 1559 save_arg(short); 1560 break; 1561 default: 1562 save_arg(int); 1563 } 1564 } 1565 } 1566 1567 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; 1568 #undef save_arg 1569 } 1570 EXPORT_SYMBOL_GPL(vbin_printf); 1571 1572 /** 1573 * bstr_printf - Format a string from binary arguments and place it in a buffer 1574 * @buf: The buffer to place the result into 1575 * @size: The size of the buffer, including the trailing null space 1576 * @fmt: The format string to use 1577 * @bin_buf: Binary arguments for the format string 1578 * 1579 * This function like C99 vsnprintf, but the difference is that vsnprintf gets 1580 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is 1581 * a binary buffer that generated by vbin_printf. 1582 * 1583 * The format follows C99 vsnprintf, but has some extensions: 1584 * see vsnprintf comment for details. 1585 * 1586 * The return value is the number of characters which would 1587 * be generated for the given input, excluding the trailing 1588 * '\0', as per ISO C99. If you want to have the exact 1589 * number of characters written into @buf as return value 1590 * (not including the trailing '\0'), use vscnprintf(). If the 1591 * return is greater than or equal to @size, the resulting 1592 * string is truncated. 1593 */ 1594 int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) 1595 { 1596 struct printf_spec spec = {0}; 1597 char *str, *end; 1598 const char *args = (const char *)bin_buf; 1599 1600 if (WARN_ON_ONCE((int) size < 0)) 1601 return 0; 1602 1603 str = buf; 1604 end = buf + size; 1605 1606 #define get_arg(type) \ 1607 ({ \ 1608 typeof(type) value; \ 1609 if (sizeof(type) == 8) { \ 1610 args = PTR_ALIGN(args, sizeof(u32)); \ 1611 *(u32 *)&value = *(u32 *)args; \ 1612 *((u32 *)&value + 1) = *(u32 *)(args + 4); \ 1613 } else { \ 1614 args = PTR_ALIGN(args, sizeof(type)); \ 1615 value = *(typeof(type) *)args; \ 1616 } \ 1617 args += sizeof(type); \ 1618 value; \ 1619 }) 1620 1621 /* Make sure end is always >= buf */ 1622 if (end < buf) { 1623 end = ((void *)-1); 1624 size = end - buf; 1625 } 1626 1627 while (*fmt) { 1628 const char *old_fmt = fmt; 1629 int read = format_decode(fmt, &spec); 1630 1631 fmt += read; 1632 1633 switch (spec.type) { 1634 case FORMAT_TYPE_NONE: { 1635 int copy = read; 1636 if (str < end) { 1637 if (copy > end - str) 1638 copy = end - str; 1639 memcpy(str, old_fmt, copy); 1640 } 1641 str += read; 1642 break; 1643 } 1644 1645 case FORMAT_TYPE_WIDTH: 1646 spec.field_width = get_arg(int); 1647 break; 1648 1649 case FORMAT_TYPE_PRECISION: 1650 spec.precision = get_arg(int); 1651 break; 1652 1653 case FORMAT_TYPE_CHAR: { 1654 char c; 1655 1656 if (!(spec.flags & LEFT)) { 1657 while (--spec.field_width > 0) { 1658 if (str < end) 1659 *str = ' '; 1660 ++str; 1661 } 1662 } 1663 c = (unsigned char) get_arg(char); 1664 if (str < end) 1665 *str = c; 1666 ++str; 1667 while (--spec.field_width > 0) { 1668 if (str < end) 1669 *str = ' '; 1670 ++str; 1671 } 1672 break; 1673 } 1674 1675 case FORMAT_TYPE_STR: { 1676 const char *str_arg = args; 1677 args += strlen(str_arg) + 1; 1678 str = string(str, end, (char *)str_arg, spec); 1679 break; 1680 } 1681 1682 case FORMAT_TYPE_PTR: 1683 str = pointer(fmt+1, str, end, get_arg(void *), spec); 1684 while (isalnum(*fmt)) 1685 fmt++; 1686 break; 1687 1688 case FORMAT_TYPE_PERCENT_CHAR: 1689 case FORMAT_TYPE_INVALID: 1690 if (str < end) 1691 *str = '%'; 1692 ++str; 1693 break; 1694 1695 case FORMAT_TYPE_NRCHARS: 1696 /* skip */ 1697 break; 1698 1699 default: { 1700 unsigned long long num; 1701 1702 switch (spec.type) { 1703 1704 case FORMAT_TYPE_LONG_LONG: 1705 num = get_arg(long long); 1706 break; 1707 case FORMAT_TYPE_ULONG: 1708 case FORMAT_TYPE_LONG: 1709 num = get_arg(unsigned long); 1710 break; 1711 case FORMAT_TYPE_SIZE_T: 1712 num = get_arg(size_t); 1713 break; 1714 case FORMAT_TYPE_PTRDIFF: 1715 num = get_arg(ptrdiff_t); 1716 break; 1717 case FORMAT_TYPE_UBYTE: 1718 num = get_arg(unsigned char); 1719 break; 1720 case FORMAT_TYPE_BYTE: 1721 num = get_arg(signed char); 1722 break; 1723 case FORMAT_TYPE_USHORT: 1724 num = get_arg(unsigned short); 1725 break; 1726 case FORMAT_TYPE_SHORT: 1727 num = get_arg(short); 1728 break; 1729 case FORMAT_TYPE_UINT: 1730 num = get_arg(unsigned int); 1731 break; 1732 default: 1733 num = get_arg(int); 1734 } 1735 1736 str = number(str, end, num, spec); 1737 } /* default: */ 1738 } /* switch(spec.type) */ 1739 } /* while(*fmt) */ 1740 1741 if (size > 0) { 1742 if (str < end) 1743 *str = '\0'; 1744 else 1745 end[-1] = '\0'; 1746 } 1747 1748 #undef get_arg 1749 1750 /* the trailing null byte doesn't count towards the total */ 1751 return str - buf; 1752 } 1753 EXPORT_SYMBOL_GPL(bstr_printf); 1754 1755 /** 1756 * bprintf - Parse a format string and place args' binary value in a buffer 1757 * @bin_buf: The buffer to place args' binary value 1758 * @size: The size of the buffer(by words(32bits), not characters) 1759 * @fmt: The format string to use 1760 * @...: Arguments for the format string 1761 * 1762 * The function returns the number of words(u32) written 1763 * into @bin_buf. 1764 */ 1765 int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) 1766 { 1767 va_list args; 1768 int ret; 1769 1770 va_start(args, fmt); 1771 ret = vbin_printf(bin_buf, size, fmt, args); 1772 va_end(args); 1773 1774 return ret; 1775 } 1776 EXPORT_SYMBOL_GPL(bprintf); 1777 1778 #endif /* CONFIG_BINARY_PRINTF */ 1779 1780 /** 1781 * vsscanf - Unformat a buffer into a list of arguments 1782 * @buf: input buffer 1783 * @fmt: format of buffer 1784 * @args: arguments 1785 */ 1786 int vsscanf(const char *buf, const char *fmt, va_list args) 1787 { 1788 const char *str = buf; 1789 char *next; 1790 char digit; 1791 int num = 0; 1792 u8 qualifier; 1793 u8 base; 1794 s16 field_width; 1795 bool is_sign; 1796 1797 while (*fmt && *str) { 1798 /* skip any white space in format */ 1799 /* white space in format matchs any amount of 1800 * white space, including none, in the input. 1801 */ 1802 if (isspace(*fmt)) { 1803 fmt = skip_spaces(++fmt); 1804 str = skip_spaces(str); 1805 } 1806 1807 /* anything that is not a conversion must match exactly */ 1808 if (*fmt != '%' && *fmt) { 1809 if (*fmt++ != *str++) 1810 break; 1811 continue; 1812 } 1813 1814 if (!*fmt) 1815 break; 1816 ++fmt; 1817 1818 /* skip this conversion. 1819 * advance both strings to next white space 1820 */ 1821 if (*fmt == '*') { 1822 while (!isspace(*fmt) && *fmt != '%' && *fmt) 1823 fmt++; 1824 while (!isspace(*str) && *str) 1825 str++; 1826 continue; 1827 } 1828 1829 /* get field width */ 1830 field_width = -1; 1831 if (isdigit(*fmt)) 1832 field_width = skip_atoi(&fmt); 1833 1834 /* get conversion qualifier */ 1835 qualifier = -1; 1836 if (*fmt == 'h' || _tolower(*fmt) == 'l' || 1837 _tolower(*fmt) == 'z') { 1838 qualifier = *fmt++; 1839 if (unlikely(qualifier == *fmt)) { 1840 if (qualifier == 'h') { 1841 qualifier = 'H'; 1842 fmt++; 1843 } else if (qualifier == 'l') { 1844 qualifier = 'L'; 1845 fmt++; 1846 } 1847 } 1848 } 1849 1850 if (!*fmt || !*str) 1851 break; 1852 1853 base = 10; 1854 is_sign = 0; 1855 1856 switch (*fmt++) { 1857 case 'c': 1858 { 1859 char *s = (char *)va_arg(args, char*); 1860 if (field_width == -1) 1861 field_width = 1; 1862 do { 1863 *s++ = *str++; 1864 } while (--field_width > 0 && *str); 1865 num++; 1866 } 1867 continue; 1868 case 's': 1869 { 1870 char *s = (char *)va_arg(args, char *); 1871 if (field_width == -1) 1872 field_width = SHRT_MAX; 1873 /* first, skip leading white space in buffer */ 1874 str = skip_spaces(str); 1875 1876 /* now copy until next white space */ 1877 while (*str && !isspace(*str) && field_width--) 1878 *s++ = *str++; 1879 *s = '\0'; 1880 num++; 1881 } 1882 continue; 1883 case 'n': 1884 /* return number of characters read so far */ 1885 { 1886 int *i = (int *)va_arg(args, int*); 1887 *i = str - buf; 1888 } 1889 continue; 1890 case 'o': 1891 base = 8; 1892 break; 1893 case 'x': 1894 case 'X': 1895 base = 16; 1896 break; 1897 case 'i': 1898 base = 0; 1899 case 'd': 1900 is_sign = 1; 1901 case 'u': 1902 break; 1903 case '%': 1904 /* looking for '%' in str */ 1905 if (*str++ != '%') 1906 return num; 1907 continue; 1908 default: 1909 /* invalid format; stop here */ 1910 return num; 1911 } 1912 1913 /* have some sort of integer conversion. 1914 * first, skip white space in buffer. 1915 */ 1916 str = skip_spaces(str); 1917 1918 digit = *str; 1919 if (is_sign && digit == '-') 1920 digit = *(str + 1); 1921 1922 if (!digit 1923 || (base == 16 && !isxdigit(digit)) 1924 || (base == 10 && !isdigit(digit)) 1925 || (base == 8 && (!isdigit(digit) || digit > '7')) 1926 || (base == 0 && !isdigit(digit))) 1927 break; 1928 1929 switch (qualifier) { 1930 case 'H': /* that's 'hh' in format */ 1931 if (is_sign) { 1932 signed char *s = (signed char *)va_arg(args, signed char *); 1933 *s = (signed char)simple_strtol(str, &next, base); 1934 } else { 1935 unsigned char *s = (unsigned char *)va_arg(args, unsigned char *); 1936 *s = (unsigned char)simple_strtoul(str, &next, base); 1937 } 1938 break; 1939 case 'h': 1940 if (is_sign) { 1941 short *s = (short *)va_arg(args, short *); 1942 *s = (short)simple_strtol(str, &next, base); 1943 } else { 1944 unsigned short *s = (unsigned short *)va_arg(args, unsigned short *); 1945 *s = (unsigned short)simple_strtoul(str, &next, base); 1946 } 1947 break; 1948 case 'l': 1949 if (is_sign) { 1950 long *l = (long *)va_arg(args, long *); 1951 *l = simple_strtol(str, &next, base); 1952 } else { 1953 unsigned long *l = (unsigned long *)va_arg(args, unsigned long *); 1954 *l = simple_strtoul(str, &next, base); 1955 } 1956 break; 1957 case 'L': 1958 if (is_sign) { 1959 long long *l = (long long *)va_arg(args, long long *); 1960 *l = simple_strtoll(str, &next, base); 1961 } else { 1962 unsigned long long *l = (unsigned long long *)va_arg(args, unsigned long long *); 1963 *l = simple_strtoull(str, &next, base); 1964 } 1965 break; 1966 case 'Z': 1967 case 'z': 1968 { 1969 size_t *s = (size_t *)va_arg(args, size_t *); 1970 *s = (size_t)simple_strtoul(str, &next, base); 1971 } 1972 break; 1973 default: 1974 if (is_sign) { 1975 int *i = (int *)va_arg(args, int *); 1976 *i = (int)simple_strtol(str, &next, base); 1977 } else { 1978 unsigned int *i = (unsigned int *)va_arg(args, unsigned int*); 1979 *i = (unsigned int)simple_strtoul(str, &next, base); 1980 } 1981 break; 1982 } 1983 num++; 1984 1985 if (!next) 1986 break; 1987 str = next; 1988 } 1989 1990 /* 1991 * Now we've come all the way through so either the input string or the 1992 * format ended. In the former case, there can be a %n at the current 1993 * position in the format that needs to be filled. 1994 */ 1995 if (*fmt == '%' && *(fmt + 1) == 'n') { 1996 int *p = (int *)va_arg(args, int *); 1997 *p = str - buf; 1998 } 1999 2000 return num; 2001 } 2002 EXPORT_SYMBOL(vsscanf); 2003 2004 /** 2005 * sscanf - Unformat a buffer into a list of arguments 2006 * @buf: input buffer 2007 * @fmt: formatting of buffer 2008 * @...: resulting arguments 2009 */ 2010 int sscanf(const char *buf, const char *fmt, ...) 2011 { 2012 va_list args; 2013 int i; 2014 2015 va_start(args, fmt); 2016 i = vsscanf(buf, fmt, args); 2017 va_end(args); 2018 2019 return i; 2020 } 2021 EXPORT_SYMBOL(sscanf); 2022