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 29 #include <asm/page.h> /* for PAGE_SIZE */ 30 #include <asm/div64.h> 31 #include <asm/sections.h> /* for dereference_function_descriptor() */ 32 33 /* Works only for digits and letters, but small and fast */ 34 #define TOLOWER(x) ((x) | 0x20) 35 36 static unsigned int simple_guess_base(const char *cp) 37 { 38 if (cp[0] == '0') { 39 if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2])) 40 return 16; 41 else 42 return 8; 43 } else { 44 return 10; 45 } 46 } 47 48 /** 49 * simple_strtoul - convert a string to an unsigned long 50 * @cp: The start of the string 51 * @endp: A pointer to the end of the parsed string will be placed here 52 * @base: The number base to use 53 */ 54 unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) 55 { 56 unsigned long result = 0; 57 58 if (!base) 59 base = simple_guess_base(cp); 60 61 if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x') 62 cp += 2; 63 64 while (isxdigit(*cp)) { 65 unsigned int value; 66 67 value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10; 68 if (value >= base) 69 break; 70 result = result * base + value; 71 cp++; 72 } 73 74 if (endp) 75 *endp = (char *)cp; 76 return result; 77 } 78 EXPORT_SYMBOL(simple_strtoul); 79 80 /** 81 * simple_strtol - convert a string to a signed long 82 * @cp: The start of the string 83 * @endp: A pointer to the end of the parsed string will be placed here 84 * @base: The number base to use 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 return simple_strtoul(cp, endp, base); 91 } 92 EXPORT_SYMBOL(simple_strtol); 93 94 /** 95 * simple_strtoull - convert a string to an unsigned long long 96 * @cp: The start of the string 97 * @endp: A pointer to the end of the parsed string will be placed here 98 * @base: The number base to use 99 */ 100 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) 101 { 102 unsigned long long result = 0; 103 104 if (!base) 105 base = simple_guess_base(cp); 106 107 if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x') 108 cp += 2; 109 110 while (isxdigit(*cp)) { 111 unsigned int value; 112 113 value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10; 114 if (value >= base) 115 break; 116 result = result * base + value; 117 cp++; 118 } 119 120 if (endp) 121 *endp = (char *)cp; 122 return result; 123 } 124 EXPORT_SYMBOL(simple_strtoull); 125 126 /** 127 * simple_strtoll - convert a string to a signed long long 128 * @cp: The start of the string 129 * @endp: A pointer to the end of the parsed string will be placed here 130 * @base: The number base to use 131 */ 132 long long simple_strtoll(const char *cp, char **endp, unsigned int base) 133 { 134 if(*cp=='-') 135 return -simple_strtoull(cp + 1, endp, base); 136 return simple_strtoull(cp, endp, base); 137 } 138 139 /** 140 * strict_strtoul - convert a string to an unsigned long strictly 141 * @cp: The string to be converted 142 * @base: The number base to use 143 * @res: The converted result value 144 * 145 * strict_strtoul converts a string to an unsigned long only if the 146 * string is really an unsigned long string, any string containing 147 * any invalid char at the tail will be rejected and -EINVAL is returned, 148 * only a newline char at the tail is acceptible because people generally 149 * change a module parameter in the following way: 150 * 151 * echo 1024 > /sys/module/e1000/parameters/copybreak 152 * 153 * echo will append a newline to the tail. 154 * 155 * It returns 0 if conversion is successful and *res is set to the converted 156 * value, otherwise it returns -EINVAL and *res is set to 0. 157 * 158 * simple_strtoul just ignores the successive invalid characters and 159 * return the converted value of prefix part of the string. 160 */ 161 int strict_strtoul(const char *cp, unsigned int base, unsigned long *res) 162 { 163 char *tail; 164 unsigned long val; 165 size_t len; 166 167 *res = 0; 168 len = strlen(cp); 169 if (len == 0) 170 return -EINVAL; 171 172 val = simple_strtoul(cp, &tail, base); 173 if (tail == cp) 174 return -EINVAL; 175 if ((*tail == '\0') || 176 ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) { 177 *res = val; 178 return 0; 179 } 180 181 return -EINVAL; 182 } 183 EXPORT_SYMBOL(strict_strtoul); 184 185 /** 186 * strict_strtol - convert a string to a long strictly 187 * @cp: The string to be converted 188 * @base: The number base to use 189 * @res: The converted result value 190 * 191 * strict_strtol is similiar to strict_strtoul, but it allows the first 192 * character of a string is '-'. 193 * 194 * It returns 0 if conversion is successful and *res is set to the converted 195 * value, otherwise it returns -EINVAL and *res is set to 0. 196 */ 197 int strict_strtol(const char *cp, unsigned int base, long *res) 198 { 199 int ret; 200 if (*cp == '-') { 201 ret = strict_strtoul(cp + 1, base, (unsigned long *)res); 202 if (!ret) 203 *res = -(*res); 204 } else { 205 ret = strict_strtoul(cp, base, (unsigned long *)res); 206 } 207 208 return ret; 209 } 210 EXPORT_SYMBOL(strict_strtol); 211 212 /** 213 * strict_strtoull - convert a string to an unsigned long long strictly 214 * @cp: The string to be converted 215 * @base: The number base to use 216 * @res: The converted result value 217 * 218 * strict_strtoull converts a string to an unsigned long long only if the 219 * string is really an unsigned long long string, any string containing 220 * any invalid char at the tail will be rejected and -EINVAL is returned, 221 * only a newline char at the tail is acceptible because people generally 222 * change a module parameter in the following way: 223 * 224 * echo 1024 > /sys/module/e1000/parameters/copybreak 225 * 226 * echo will append a newline to the tail of the string. 227 * 228 * It returns 0 if conversion is successful and *res is set to the converted 229 * value, otherwise it returns -EINVAL and *res is set to 0. 230 * 231 * simple_strtoull just ignores the successive invalid characters and 232 * return the converted value of prefix part of the string. 233 */ 234 int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res) 235 { 236 char *tail; 237 unsigned long long val; 238 size_t len; 239 240 *res = 0; 241 len = strlen(cp); 242 if (len == 0) 243 return -EINVAL; 244 245 val = simple_strtoull(cp, &tail, base); 246 if (tail == cp) 247 return -EINVAL; 248 if ((*tail == '\0') || 249 ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) { 250 *res = val; 251 return 0; 252 } 253 254 return -EINVAL; 255 } 256 EXPORT_SYMBOL(strict_strtoull); 257 258 /** 259 * strict_strtoll - convert a string to a long long strictly 260 * @cp: The string to be converted 261 * @base: The number base to use 262 * @res: The converted result value 263 * 264 * strict_strtoll is similiar to strict_strtoull, but it allows the first 265 * character of a string is '-'. 266 * 267 * It returns 0 if conversion is successful and *res is set to the converted 268 * value, otherwise it returns -EINVAL and *res is set to 0. 269 */ 270 int strict_strtoll(const char *cp, unsigned int base, long long *res) 271 { 272 int ret; 273 if (*cp == '-') { 274 ret = strict_strtoull(cp + 1, base, (unsigned long long *)res); 275 if (!ret) 276 *res = -(*res); 277 } else { 278 ret = strict_strtoull(cp, base, (unsigned long long *)res); 279 } 280 281 return ret; 282 } 283 EXPORT_SYMBOL(strict_strtoll); 284 285 static int skip_atoi(const char **s) 286 { 287 int i=0; 288 289 while (isdigit(**s)) 290 i = i*10 + *((*s)++) - '0'; 291 return i; 292 } 293 294 /* Decimal conversion is by far the most typical, and is used 295 * for /proc and /sys data. This directly impacts e.g. top performance 296 * with many processes running. We optimize it for speed 297 * using code from 298 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html 299 * (with permission from the author, Douglas W. Jones). */ 300 301 /* Formats correctly any integer in [0,99999]. 302 * Outputs from one to five digits depending on input. 303 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */ 304 static char* put_dec_trunc(char *buf, unsigned q) 305 { 306 unsigned d3, d2, d1, d0; 307 d1 = (q>>4) & 0xf; 308 d2 = (q>>8) & 0xf; 309 d3 = (q>>12); 310 311 d0 = 6*(d3 + d2 + d1) + (q & 0xf); 312 q = (d0 * 0xcd) >> 11; 313 d0 = d0 - 10*q; 314 *buf++ = d0 + '0'; /* least significant digit */ 315 d1 = q + 9*d3 + 5*d2 + d1; 316 if (d1 != 0) { 317 q = (d1 * 0xcd) >> 11; 318 d1 = d1 - 10*q; 319 *buf++ = d1 + '0'; /* next digit */ 320 321 d2 = q + 2*d2; 322 if ((d2 != 0) || (d3 != 0)) { 323 q = (d2 * 0xd) >> 7; 324 d2 = d2 - 10*q; 325 *buf++ = d2 + '0'; /* next digit */ 326 327 d3 = q + 4*d3; 328 if (d3 != 0) { 329 q = (d3 * 0xcd) >> 11; 330 d3 = d3 - 10*q; 331 *buf++ = d3 + '0'; /* next digit */ 332 if (q != 0) 333 *buf++ = q + '0'; /* most sign. digit */ 334 } 335 } 336 } 337 return buf; 338 } 339 /* Same with if's removed. Always emits five digits */ 340 static char* put_dec_full(char *buf, unsigned q) 341 { 342 /* BTW, if q is in [0,9999], 8-bit ints will be enough, */ 343 /* but anyway, gcc produces better code with full-sized ints */ 344 unsigned d3, d2, d1, d0; 345 d1 = (q>>4) & 0xf; 346 d2 = (q>>8) & 0xf; 347 d3 = (q>>12); 348 349 /* Possible ways to approx. divide by 10 */ 350 /* gcc -O2 replaces multiply with shifts and adds */ 351 // (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386) 352 // (x * 0x67) >> 10: 1100111 353 // (x * 0x34) >> 9: 110100 - same 354 // (x * 0x1a) >> 8: 11010 - same 355 // (x * 0x0d) >> 7: 1101 - same, shortest code (on i386) 356 357 d0 = 6*(d3 + d2 + d1) + (q & 0xf); 358 q = (d0 * 0xcd) >> 11; 359 d0 = d0 - 10*q; 360 *buf++ = d0 + '0'; 361 d1 = q + 9*d3 + 5*d2 + d1; 362 q = (d1 * 0xcd) >> 11; 363 d1 = d1 - 10*q; 364 *buf++ = d1 + '0'; 365 366 d2 = q + 2*d2; 367 q = (d2 * 0xd) >> 7; 368 d2 = d2 - 10*q; 369 *buf++ = d2 + '0'; 370 371 d3 = q + 4*d3; 372 q = (d3 * 0xcd) >> 11; /* - shorter code */ 373 /* q = (d3 * 0x67) >> 10; - would also work */ 374 d3 = d3 - 10*q; 375 *buf++ = d3 + '0'; 376 *buf++ = q + '0'; 377 return buf; 378 } 379 /* No inlining helps gcc to use registers better */ 380 static noinline char* put_dec(char *buf, unsigned long long num) 381 { 382 while (1) { 383 unsigned rem; 384 if (num < 100000) 385 return put_dec_trunc(buf, num); 386 rem = do_div(num, 100000); 387 buf = put_dec_full(buf, rem); 388 } 389 } 390 391 #define ZEROPAD 1 /* pad with zero */ 392 #define SIGN 2 /* unsigned/signed long */ 393 #define PLUS 4 /* show plus */ 394 #define SPACE 8 /* space if plus */ 395 #define LEFT 16 /* left justified */ 396 #define SMALL 32 /* Must be 32 == 0x20 */ 397 #define SPECIAL 64 /* 0x */ 398 399 enum format_type { 400 FORMAT_TYPE_NONE, /* Just a string part */ 401 FORMAT_TYPE_WIDTH, 402 FORMAT_TYPE_PRECISION, 403 FORMAT_TYPE_CHAR, 404 FORMAT_TYPE_STR, 405 FORMAT_TYPE_PTR, 406 FORMAT_TYPE_PERCENT_CHAR, 407 FORMAT_TYPE_INVALID, 408 FORMAT_TYPE_LONG_LONG, 409 FORMAT_TYPE_ULONG, 410 FORMAT_TYPE_LONG, 411 FORMAT_TYPE_USHORT, 412 FORMAT_TYPE_SHORT, 413 FORMAT_TYPE_UINT, 414 FORMAT_TYPE_INT, 415 FORMAT_TYPE_NRCHARS, 416 FORMAT_TYPE_SIZE_T, 417 FORMAT_TYPE_PTRDIFF 418 }; 419 420 struct printf_spec { 421 enum format_type type; 422 int flags; /* flags to number() */ 423 int field_width; /* width of output field */ 424 int base; 425 int precision; /* # of digits/chars */ 426 int qualifier; 427 }; 428 429 static char *number(char *buf, char *end, unsigned long long num, 430 struct printf_spec spec) 431 { 432 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ 433 static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ 434 435 char tmp[66]; 436 char sign; 437 char locase; 438 int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); 439 int i; 440 441 /* locase = 0 or 0x20. ORing digits or letters with 'locase' 442 * produces same digits or (maybe lowercased) letters */ 443 locase = (spec.flags & SMALL); 444 if (spec.flags & LEFT) 445 spec.flags &= ~ZEROPAD; 446 sign = 0; 447 if (spec.flags & SIGN) { 448 if ((signed long long) num < 0) { 449 sign = '-'; 450 num = - (signed long long) num; 451 spec.field_width--; 452 } else if (spec.flags & PLUS) { 453 sign = '+'; 454 spec.field_width--; 455 } else if (spec.flags & SPACE) { 456 sign = ' '; 457 spec.field_width--; 458 } 459 } 460 if (need_pfx) { 461 spec.field_width--; 462 if (spec.base == 16) 463 spec.field_width--; 464 } 465 466 /* generate full string in tmp[], in reverse order */ 467 i = 0; 468 if (num == 0) 469 tmp[i++] = '0'; 470 /* Generic code, for any base: 471 else do { 472 tmp[i++] = (digits[do_div(num,base)] | locase); 473 } while (num != 0); 474 */ 475 else if (spec.base != 10) { /* 8 or 16 */ 476 int mask = spec.base - 1; 477 int shift = 3; 478 if (spec.base == 16) shift = 4; 479 do { 480 tmp[i++] = (digits[((unsigned char)num) & mask] | locase); 481 num >>= shift; 482 } while (num); 483 } else { /* base 10 */ 484 i = put_dec(tmp, num) - tmp; 485 } 486 487 /* printing 100 using %2d gives "100", not "00" */ 488 if (i > spec.precision) 489 spec.precision = i; 490 /* leading space padding */ 491 spec.field_width -= spec.precision; 492 if (!(spec.flags & (ZEROPAD+LEFT))) { 493 while(--spec.field_width >= 0) { 494 if (buf < end) 495 *buf = ' '; 496 ++buf; 497 } 498 } 499 /* sign */ 500 if (sign) { 501 if (buf < end) 502 *buf = sign; 503 ++buf; 504 } 505 /* "0x" / "0" prefix */ 506 if (need_pfx) { 507 if (buf < end) 508 *buf = '0'; 509 ++buf; 510 if (spec.base == 16) { 511 if (buf < end) 512 *buf = ('X' | locase); 513 ++buf; 514 } 515 } 516 /* zero or space padding */ 517 if (!(spec.flags & LEFT)) { 518 char c = (spec.flags & ZEROPAD) ? '0' : ' '; 519 while (--spec.field_width >= 0) { 520 if (buf < end) 521 *buf = c; 522 ++buf; 523 } 524 } 525 /* hmm even more zero padding? */ 526 while (i <= --spec.precision) { 527 if (buf < end) 528 *buf = '0'; 529 ++buf; 530 } 531 /* actual digits of result */ 532 while (--i >= 0) { 533 if (buf < end) 534 *buf = tmp[i]; 535 ++buf; 536 } 537 /* trailing space padding */ 538 while (--spec.field_width >= 0) { 539 if (buf < end) 540 *buf = ' '; 541 ++buf; 542 } 543 return buf; 544 } 545 546 static char *string(char *buf, char *end, char *s, struct printf_spec spec) 547 { 548 int len, i; 549 550 if ((unsigned long)s < PAGE_SIZE) 551 s = "<NULL>"; 552 553 len = strnlen(s, spec.precision); 554 555 if (!(spec.flags & LEFT)) { 556 while (len < spec.field_width--) { 557 if (buf < end) 558 *buf = ' '; 559 ++buf; 560 } 561 } 562 for (i = 0; i < len; ++i) { 563 if (buf < end) 564 *buf = *s; 565 ++buf; ++s; 566 } 567 while (len < spec.field_width--) { 568 if (buf < end) 569 *buf = ' '; 570 ++buf; 571 } 572 return buf; 573 } 574 575 static char *symbol_string(char *buf, char *end, void *ptr, 576 struct printf_spec spec) 577 { 578 unsigned long value = (unsigned long) ptr; 579 #ifdef CONFIG_KALLSYMS 580 char sym[KSYM_SYMBOL_LEN]; 581 sprint_symbol(sym, value); 582 return string(buf, end, sym, spec); 583 #else 584 spec.field_width = 2*sizeof(void *); 585 spec.flags |= SPECIAL | SMALL | ZEROPAD; 586 spec.base = 16; 587 return number(buf, end, value, spec); 588 #endif 589 } 590 591 static char *resource_string(char *buf, char *end, struct resource *res, 592 struct printf_spec spec) 593 { 594 #ifndef IO_RSRC_PRINTK_SIZE 595 #define IO_RSRC_PRINTK_SIZE 4 596 #endif 597 598 #ifndef MEM_RSRC_PRINTK_SIZE 599 #define MEM_RSRC_PRINTK_SIZE 8 600 #endif 601 struct printf_spec num_spec = { 602 .base = 16, 603 .precision = -1, 604 .flags = SPECIAL | SMALL | ZEROPAD, 605 }; 606 /* room for the actual numbers, the two "0x", -, [, ] and the final zero */ 607 char sym[4*sizeof(resource_size_t) + 8]; 608 char *p = sym, *pend = sym + sizeof(sym); 609 int size = -1; 610 611 if (res->flags & IORESOURCE_IO) 612 size = IO_RSRC_PRINTK_SIZE; 613 else if (res->flags & IORESOURCE_MEM) 614 size = MEM_RSRC_PRINTK_SIZE; 615 616 *p++ = '['; 617 num_spec.field_width = size; 618 p = number(p, pend, res->start, num_spec); 619 *p++ = '-'; 620 p = number(p, pend, res->end, num_spec); 621 *p++ = ']'; 622 *p = 0; 623 624 return string(buf, end, sym, spec); 625 } 626 627 static char *mac_address_string(char *buf, char *end, u8 *addr, 628 struct printf_spec spec) 629 { 630 char mac_addr[6 * 3]; /* (6 * 2 hex digits), 5 colons and trailing zero */ 631 char *p = mac_addr; 632 int i; 633 634 for (i = 0; i < 6; i++) { 635 p = pack_hex_byte(p, addr[i]); 636 if (!(spec.flags & SPECIAL) && i != 5) 637 *p++ = ':'; 638 } 639 *p = '\0'; 640 spec.flags &= ~SPECIAL; 641 642 return string(buf, end, mac_addr, spec); 643 } 644 645 static char *ip6_addr_string(char *buf, char *end, u8 *addr, 646 struct printf_spec spec) 647 { 648 char ip6_addr[8 * 5]; /* (8 * 4 hex digits), 7 colons and trailing zero */ 649 char *p = ip6_addr; 650 int i; 651 652 for (i = 0; i < 8; i++) { 653 p = pack_hex_byte(p, addr[2 * i]); 654 p = pack_hex_byte(p, addr[2 * i + 1]); 655 if (!(spec.flags & SPECIAL) && i != 7) 656 *p++ = ':'; 657 } 658 *p = '\0'; 659 spec.flags &= ~SPECIAL; 660 661 return string(buf, end, ip6_addr, spec); 662 } 663 664 static char *ip4_addr_string(char *buf, char *end, u8 *addr, 665 struct printf_spec spec) 666 { 667 char ip4_addr[4 * 4]; /* (4 * 3 decimal digits), 3 dots and trailing zero */ 668 char temp[3]; /* hold each IP quad in reverse order */ 669 char *p = ip4_addr; 670 int i, digits; 671 672 for (i = 0; i < 4; i++) { 673 digits = put_dec_trunc(temp, addr[i]) - temp; 674 /* reverse the digits in the quad */ 675 while (digits--) 676 *p++ = temp[digits]; 677 if (i != 3) 678 *p++ = '.'; 679 } 680 *p = '\0'; 681 spec.flags &= ~SPECIAL; 682 683 return string(buf, end, ip4_addr, spec); 684 } 685 686 /* 687 * Show a '%p' thing. A kernel extension is that the '%p' is followed 688 * by an extra set of alphanumeric characters that are extended format 689 * specifiers. 690 * 691 * Right now we handle: 692 * 693 * - 'F' For symbolic function descriptor pointers 694 * - 'S' For symbolic direct pointers 695 * - 'R' For a struct resource pointer, it prints the range of 696 * addresses (not the name nor the flags) 697 * - 'M' For a 6-byte MAC address, it prints the address in the 698 * usual colon-separated hex notation 699 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated 700 * decimal for v4 and colon separated network-order 16 bit hex for v6) 701 * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is 702 * currently the same 703 * 704 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 705 * function pointers are really function descriptors, which contain a 706 * pointer to the real address. 707 */ 708 static char *pointer(const char *fmt, char *buf, char *end, void *ptr, 709 struct printf_spec spec) 710 { 711 if (!ptr) 712 return string(buf, end, "(null)", spec); 713 714 switch (*fmt) { 715 case 'F': 716 ptr = dereference_function_descriptor(ptr); 717 /* Fallthrough */ 718 case 'S': 719 return symbol_string(buf, end, ptr, spec); 720 case 'R': 721 return resource_string(buf, end, ptr, spec); 722 case 'm': 723 spec.flags |= SPECIAL; 724 /* Fallthrough */ 725 case 'M': 726 return mac_address_string(buf, end, ptr, spec); 727 case 'i': 728 spec.flags |= SPECIAL; 729 /* Fallthrough */ 730 case 'I': 731 if (fmt[1] == '6') 732 return ip6_addr_string(buf, end, ptr, spec); 733 if (fmt[1] == '4') 734 return ip4_addr_string(buf, end, ptr, spec); 735 spec.flags &= ~SPECIAL; 736 break; 737 } 738 spec.flags |= SMALL; 739 if (spec.field_width == -1) { 740 spec.field_width = 2*sizeof(void *); 741 spec.flags |= ZEROPAD; 742 } 743 spec.base = 16; 744 745 return number(buf, end, (unsigned long) ptr, spec); 746 } 747 748 /* 749 * Helper function to decode printf style format. 750 * Each call decode a token from the format and return the 751 * number of characters read (or likely the delta where it wants 752 * to go on the next call). 753 * The decoded token is returned through the parameters 754 * 755 * 'h', 'l', or 'L' for integer fields 756 * 'z' support added 23/7/1999 S.H. 757 * 'z' changed to 'Z' --davidm 1/25/99 758 * 't' added for ptrdiff_t 759 * 760 * @fmt: the format string 761 * @type of the token returned 762 * @flags: various flags such as +, -, # tokens.. 763 * @field_width: overwritten width 764 * @base: base of the number (octal, hex, ...) 765 * @precision: precision of a number 766 * @qualifier: qualifier of a number (long, size_t, ...) 767 */ 768 static int format_decode(const char *fmt, struct printf_spec *spec) 769 { 770 const char *start = fmt; 771 772 /* we finished early by reading the field width */ 773 if (spec->type == FORMAT_TYPE_WIDTH) { 774 if (spec->field_width < 0) { 775 spec->field_width = -spec->field_width; 776 spec->flags |= LEFT; 777 } 778 spec->type = FORMAT_TYPE_NONE; 779 goto precision; 780 } 781 782 /* we finished early by reading the precision */ 783 if (spec->type == FORMAT_TYPE_PRECISION) { 784 if (spec->precision < 0) 785 spec->precision = 0; 786 787 spec->type = FORMAT_TYPE_NONE; 788 goto qualifier; 789 } 790 791 /* By default */ 792 spec->type = FORMAT_TYPE_NONE; 793 794 for (; *fmt ; ++fmt) { 795 if (*fmt == '%') 796 break; 797 } 798 799 /* Return the current non-format string */ 800 if (fmt != start || !*fmt) 801 return fmt - start; 802 803 /* Process flags */ 804 spec->flags = 0; 805 806 while (1) { /* this also skips first '%' */ 807 bool found = true; 808 809 ++fmt; 810 811 switch (*fmt) { 812 case '-': spec->flags |= LEFT; break; 813 case '+': spec->flags |= PLUS; break; 814 case ' ': spec->flags |= SPACE; break; 815 case '#': spec->flags |= SPECIAL; break; 816 case '0': spec->flags |= ZEROPAD; break; 817 default: found = false; 818 } 819 820 if (!found) 821 break; 822 } 823 824 /* get field width */ 825 spec->field_width = -1; 826 827 if (isdigit(*fmt)) 828 spec->field_width = skip_atoi(&fmt); 829 else if (*fmt == '*') { 830 /* it's the next argument */ 831 spec->type = FORMAT_TYPE_WIDTH; 832 return ++fmt - start; 833 } 834 835 precision: 836 /* get the precision */ 837 spec->precision = -1; 838 if (*fmt == '.') { 839 ++fmt; 840 if (isdigit(*fmt)) { 841 spec->precision = skip_atoi(&fmt); 842 if (spec->precision < 0) 843 spec->precision = 0; 844 } else if (*fmt == '*') { 845 /* it's the next argument */ 846 spec->type = FORMAT_TYPE_PRECISION; 847 return ++fmt - start; 848 } 849 } 850 851 qualifier: 852 /* get the conversion qualifier */ 853 spec->qualifier = -1; 854 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || 855 *fmt == 'Z' || *fmt == 'z' || *fmt == 't') { 856 spec->qualifier = *fmt; 857 ++fmt; 858 if (spec->qualifier == 'l' && *fmt == 'l') { 859 spec->qualifier = 'L'; 860 ++fmt; 861 } 862 } 863 864 /* default base */ 865 spec->base = 10; 866 switch (*fmt) { 867 case 'c': 868 spec->type = FORMAT_TYPE_CHAR; 869 return ++fmt - start; 870 871 case 's': 872 spec->type = FORMAT_TYPE_STR; 873 return ++fmt - start; 874 875 case 'p': 876 spec->type = FORMAT_TYPE_PTR; 877 return fmt - start; 878 /* skip alnum */ 879 880 case 'n': 881 spec->type = FORMAT_TYPE_NRCHARS; 882 return ++fmt - start; 883 884 case '%': 885 spec->type = FORMAT_TYPE_PERCENT_CHAR; 886 return ++fmt - start; 887 888 /* integer number formats - set up the flags and "break" */ 889 case 'o': 890 spec->base = 8; 891 break; 892 893 case 'x': 894 spec->flags |= SMALL; 895 896 case 'X': 897 spec->base = 16; 898 break; 899 900 case 'd': 901 case 'i': 902 spec->flags |= SIGN; 903 case 'u': 904 break; 905 906 default: 907 spec->type = FORMAT_TYPE_INVALID; 908 return fmt - start; 909 } 910 911 if (spec->qualifier == 'L') 912 spec->type = FORMAT_TYPE_LONG_LONG; 913 else if (spec->qualifier == 'l') { 914 if (spec->flags & SIGN) 915 spec->type = FORMAT_TYPE_LONG; 916 else 917 spec->type = FORMAT_TYPE_ULONG; 918 } else if (spec->qualifier == 'Z' || spec->qualifier == 'z') { 919 spec->type = FORMAT_TYPE_SIZE_T; 920 } else if (spec->qualifier == 't') { 921 spec->type = FORMAT_TYPE_PTRDIFF; 922 } else if (spec->qualifier == 'h') { 923 if (spec->flags & SIGN) 924 spec->type = FORMAT_TYPE_SHORT; 925 else 926 spec->type = FORMAT_TYPE_USHORT; 927 } else { 928 if (spec->flags & SIGN) 929 spec->type = FORMAT_TYPE_INT; 930 else 931 spec->type = FORMAT_TYPE_UINT; 932 } 933 934 return ++fmt - start; 935 } 936 937 /** 938 * vsnprintf - Format a string and place it in a buffer 939 * @buf: The buffer to place the result into 940 * @size: The size of the buffer, including the trailing null space 941 * @fmt: The format string to use 942 * @args: Arguments for the format string 943 * 944 * This function follows C99 vsnprintf, but has some extensions: 945 * %pS output the name of a text symbol 946 * %pF output the name of a function pointer 947 * %pR output the address range in a struct resource 948 * 949 * The return value is the number of characters which would 950 * be generated for the given input, excluding the trailing 951 * '\0', as per ISO C99. If you want to have the exact 952 * number of characters written into @buf as return value 953 * (not including the trailing '\0'), use vscnprintf(). If the 954 * return is greater than or equal to @size, the resulting 955 * string is truncated. 956 * 957 * Call this function if you are already dealing with a va_list. 958 * You probably want snprintf() instead. 959 */ 960 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) 961 { 962 unsigned long long num; 963 char *str, *end, c; 964 int read; 965 struct printf_spec spec = {0}; 966 967 /* Reject out-of-range values early. Large positive sizes are 968 used for unknown buffer sizes. */ 969 if (unlikely((int) size < 0)) { 970 /* There can be only one.. */ 971 static char warn = 1; 972 WARN_ON(warn); 973 warn = 0; 974 return 0; 975 } 976 977 str = buf; 978 end = buf + size; 979 980 /* Make sure end is always >= buf */ 981 if (end < buf) { 982 end = ((void *)-1); 983 size = end - buf; 984 } 985 986 while (*fmt) { 987 const char *old_fmt = fmt; 988 989 read = format_decode(fmt, &spec); 990 991 fmt += read; 992 993 switch (spec.type) { 994 case FORMAT_TYPE_NONE: { 995 int copy = read; 996 if (str < end) { 997 if (copy > end - str) 998 copy = end - str; 999 memcpy(str, old_fmt, copy); 1000 } 1001 str += read; 1002 break; 1003 } 1004 1005 case FORMAT_TYPE_WIDTH: 1006 spec.field_width = va_arg(args, int); 1007 break; 1008 1009 case FORMAT_TYPE_PRECISION: 1010 spec.precision = va_arg(args, int); 1011 break; 1012 1013 case FORMAT_TYPE_CHAR: 1014 if (!(spec.flags & LEFT)) { 1015 while (--spec.field_width > 0) { 1016 if (str < end) 1017 *str = ' '; 1018 ++str; 1019 1020 } 1021 } 1022 c = (unsigned char) va_arg(args, int); 1023 if (str < end) 1024 *str = c; 1025 ++str; 1026 while (--spec.field_width > 0) { 1027 if (str < end) 1028 *str = ' '; 1029 ++str; 1030 } 1031 break; 1032 1033 case FORMAT_TYPE_STR: 1034 str = string(str, end, va_arg(args, char *), spec); 1035 break; 1036 1037 case FORMAT_TYPE_PTR: 1038 str = pointer(fmt+1, str, end, va_arg(args, void *), 1039 spec); 1040 while (isalnum(*fmt)) 1041 fmt++; 1042 break; 1043 1044 case FORMAT_TYPE_PERCENT_CHAR: 1045 if (str < end) 1046 *str = '%'; 1047 ++str; 1048 break; 1049 1050 case FORMAT_TYPE_INVALID: 1051 if (str < end) 1052 *str = '%'; 1053 ++str; 1054 break; 1055 1056 case FORMAT_TYPE_NRCHARS: { 1057 int qualifier = spec.qualifier; 1058 1059 if (qualifier == 'l') { 1060 long *ip = va_arg(args, long *); 1061 *ip = (str - buf); 1062 } else if (qualifier == 'Z' || 1063 qualifier == 'z') { 1064 size_t *ip = va_arg(args, size_t *); 1065 *ip = (str - buf); 1066 } else { 1067 int *ip = va_arg(args, int *); 1068 *ip = (str - buf); 1069 } 1070 break; 1071 } 1072 1073 default: 1074 switch (spec.type) { 1075 case FORMAT_TYPE_LONG_LONG: 1076 num = va_arg(args, long long); 1077 break; 1078 case FORMAT_TYPE_ULONG: 1079 num = va_arg(args, unsigned long); 1080 break; 1081 case FORMAT_TYPE_LONG: 1082 num = va_arg(args, long); 1083 break; 1084 case FORMAT_TYPE_SIZE_T: 1085 num = va_arg(args, size_t); 1086 break; 1087 case FORMAT_TYPE_PTRDIFF: 1088 num = va_arg(args, ptrdiff_t); 1089 break; 1090 case FORMAT_TYPE_USHORT: 1091 num = (unsigned short) va_arg(args, int); 1092 break; 1093 case FORMAT_TYPE_SHORT: 1094 num = (short) va_arg(args, int); 1095 break; 1096 case FORMAT_TYPE_INT: 1097 num = (int) va_arg(args, int); 1098 break; 1099 default: 1100 num = va_arg(args, unsigned int); 1101 } 1102 1103 str = number(str, end, num, spec); 1104 } 1105 } 1106 1107 if (size > 0) { 1108 if (str < end) 1109 *str = '\0'; 1110 else 1111 end[-1] = '\0'; 1112 } 1113 1114 /* the trailing null byte doesn't count towards the total */ 1115 return str-buf; 1116 1117 } 1118 EXPORT_SYMBOL(vsnprintf); 1119 1120 /** 1121 * vscnprintf - Format a string and place it in a buffer 1122 * @buf: The buffer to place the result into 1123 * @size: The size of the buffer, including the trailing null space 1124 * @fmt: The format string to use 1125 * @args: Arguments for the format string 1126 * 1127 * The return value is the number of characters which have been written into 1128 * the @buf not including the trailing '\0'. If @size is <= 0 the function 1129 * returns 0. 1130 * 1131 * Call this function if you are already dealing with a va_list. 1132 * You probably want scnprintf() instead. 1133 * 1134 * See the vsnprintf() documentation for format string extensions over C99. 1135 */ 1136 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) 1137 { 1138 int i; 1139 1140 i=vsnprintf(buf,size,fmt,args); 1141 return (i >= size) ? (size - 1) : i; 1142 } 1143 EXPORT_SYMBOL(vscnprintf); 1144 1145 /** 1146 * snprintf - Format a string and place it in a buffer 1147 * @buf: The buffer to place the result into 1148 * @size: The size of the buffer, including the trailing null space 1149 * @fmt: The format string to use 1150 * @...: Arguments for the format string 1151 * 1152 * The return value is the number of characters which would be 1153 * generated for the given input, excluding the trailing null, 1154 * as per ISO C99. If the return is greater than or equal to 1155 * @size, the resulting string is truncated. 1156 * 1157 * See the vsnprintf() documentation for format string extensions over C99. 1158 */ 1159 int snprintf(char * buf, size_t size, const char *fmt, ...) 1160 { 1161 va_list args; 1162 int i; 1163 1164 va_start(args, fmt); 1165 i=vsnprintf(buf,size,fmt,args); 1166 va_end(args); 1167 return i; 1168 } 1169 EXPORT_SYMBOL(snprintf); 1170 1171 /** 1172 * scnprintf - Format a string and place it in a buffer 1173 * @buf: The buffer to place the result into 1174 * @size: The size of the buffer, including the trailing null space 1175 * @fmt: The format string to use 1176 * @...: Arguments for the format string 1177 * 1178 * The return value is the number of characters written into @buf not including 1179 * the trailing '\0'. If @size is <= 0 the function returns 0. 1180 */ 1181 1182 int scnprintf(char * buf, size_t size, const char *fmt, ...) 1183 { 1184 va_list args; 1185 int i; 1186 1187 va_start(args, fmt); 1188 i = vsnprintf(buf, size, fmt, args); 1189 va_end(args); 1190 return (i >= size) ? (size - 1) : i; 1191 } 1192 EXPORT_SYMBOL(scnprintf); 1193 1194 /** 1195 * vsprintf - Format a string and place it in a buffer 1196 * @buf: The buffer to place the result into 1197 * @fmt: The format string to use 1198 * @args: Arguments for the format string 1199 * 1200 * The function returns the number of characters written 1201 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid 1202 * buffer overflows. 1203 * 1204 * Call this function if you are already dealing with a va_list. 1205 * You probably want sprintf() instead. 1206 * 1207 * See the vsnprintf() documentation for format string extensions over C99. 1208 */ 1209 int vsprintf(char *buf, const char *fmt, va_list args) 1210 { 1211 return vsnprintf(buf, INT_MAX, fmt, args); 1212 } 1213 EXPORT_SYMBOL(vsprintf); 1214 1215 /** 1216 * sprintf - Format a string and place it in a buffer 1217 * @buf: The buffer to place the result into 1218 * @fmt: The format string to use 1219 * @...: Arguments for the format string 1220 * 1221 * The function returns the number of characters written 1222 * into @buf. Use snprintf() or scnprintf() in order to avoid 1223 * buffer overflows. 1224 * 1225 * See the vsnprintf() documentation for format string extensions over C99. 1226 */ 1227 int sprintf(char * buf, const char *fmt, ...) 1228 { 1229 va_list args; 1230 int i; 1231 1232 va_start(args, fmt); 1233 i=vsnprintf(buf, INT_MAX, fmt, args); 1234 va_end(args); 1235 return i; 1236 } 1237 EXPORT_SYMBOL(sprintf); 1238 1239 #ifdef CONFIG_BINARY_PRINTF 1240 /* 1241 * bprintf service: 1242 * vbin_printf() - VA arguments to binary data 1243 * bstr_printf() - Binary data to text string 1244 */ 1245 1246 /** 1247 * vbin_printf - Parse a format string and place args' binary value in a buffer 1248 * @bin_buf: The buffer to place args' binary value 1249 * @size: The size of the buffer(by words(32bits), not characters) 1250 * @fmt: The format string to use 1251 * @args: Arguments for the format string 1252 * 1253 * The format follows C99 vsnprintf, except %n is ignored, and its argument 1254 * is skiped. 1255 * 1256 * The return value is the number of words(32bits) which would be generated for 1257 * the given input. 1258 * 1259 * NOTE: 1260 * If the return value is greater than @size, the resulting bin_buf is NOT 1261 * valid for bstr_printf(). 1262 */ 1263 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) 1264 { 1265 struct printf_spec spec = {0}; 1266 char *str, *end; 1267 int read; 1268 1269 str = (char *)bin_buf; 1270 end = (char *)(bin_buf + size); 1271 1272 #define save_arg(type) \ 1273 do { \ 1274 if (sizeof(type) == 8) { \ 1275 unsigned long long value; \ 1276 str = PTR_ALIGN(str, sizeof(u32)); \ 1277 value = va_arg(args, unsigned long long); \ 1278 if (str + sizeof(type) <= end) { \ 1279 *(u32 *)str = *(u32 *)&value; \ 1280 *(u32 *)(str + 4) = *((u32 *)&value + 1); \ 1281 } \ 1282 } else { \ 1283 unsigned long value; \ 1284 str = PTR_ALIGN(str, sizeof(type)); \ 1285 value = va_arg(args, int); \ 1286 if (str + sizeof(type) <= end) \ 1287 *(typeof(type) *)str = (type)value; \ 1288 } \ 1289 str += sizeof(type); \ 1290 } while (0) 1291 1292 1293 while (*fmt) { 1294 read = format_decode(fmt, &spec); 1295 1296 fmt += read; 1297 1298 switch (spec.type) { 1299 case FORMAT_TYPE_NONE: 1300 break; 1301 1302 case FORMAT_TYPE_WIDTH: 1303 case FORMAT_TYPE_PRECISION: 1304 save_arg(int); 1305 break; 1306 1307 case FORMAT_TYPE_CHAR: 1308 save_arg(char); 1309 break; 1310 1311 case FORMAT_TYPE_STR: { 1312 const char *save_str = va_arg(args, char *); 1313 size_t len; 1314 if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE 1315 || (unsigned long)save_str < PAGE_SIZE) 1316 save_str = "<NULL>"; 1317 len = strlen(save_str); 1318 if (str + len + 1 < end) 1319 memcpy(str, save_str, len + 1); 1320 str += len + 1; 1321 break; 1322 } 1323 1324 case FORMAT_TYPE_PTR: 1325 save_arg(void *); 1326 /* skip all alphanumeric pointer suffixes */ 1327 while (isalnum(*fmt)) 1328 fmt++; 1329 break; 1330 1331 case FORMAT_TYPE_PERCENT_CHAR: 1332 break; 1333 1334 case FORMAT_TYPE_INVALID: 1335 break; 1336 1337 case FORMAT_TYPE_NRCHARS: { 1338 /* skip %n 's argument */ 1339 int qualifier = spec.qualifier; 1340 void *skip_arg; 1341 if (qualifier == 'l') 1342 skip_arg = va_arg(args, long *); 1343 else if (qualifier == 'Z' || qualifier == 'z') 1344 skip_arg = va_arg(args, size_t *); 1345 else 1346 skip_arg = va_arg(args, int *); 1347 break; 1348 } 1349 1350 default: 1351 switch (spec.type) { 1352 1353 case FORMAT_TYPE_LONG_LONG: 1354 save_arg(long long); 1355 break; 1356 case FORMAT_TYPE_ULONG: 1357 case FORMAT_TYPE_LONG: 1358 save_arg(unsigned long); 1359 break; 1360 case FORMAT_TYPE_SIZE_T: 1361 save_arg(size_t); 1362 break; 1363 case FORMAT_TYPE_PTRDIFF: 1364 save_arg(ptrdiff_t); 1365 break; 1366 case FORMAT_TYPE_USHORT: 1367 case FORMAT_TYPE_SHORT: 1368 save_arg(short); 1369 break; 1370 default: 1371 save_arg(int); 1372 } 1373 } 1374 } 1375 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; 1376 1377 #undef save_arg 1378 } 1379 EXPORT_SYMBOL_GPL(vbin_printf); 1380 1381 /** 1382 * bstr_printf - Format a string from binary arguments and place it in a buffer 1383 * @buf: The buffer to place the result into 1384 * @size: The size of the buffer, including the trailing null space 1385 * @fmt: The format string to use 1386 * @bin_buf: Binary arguments for the format string 1387 * 1388 * This function like C99 vsnprintf, but the difference is that vsnprintf gets 1389 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is 1390 * a binary buffer that generated by vbin_printf. 1391 * 1392 * The format follows C99 vsnprintf, but has some extensions: 1393 * %pS output the name of a text symbol 1394 * %pF output the name of a function pointer 1395 * %pR output the address range in a struct resource 1396 * %n is ignored 1397 * 1398 * The return value is the number of characters which would 1399 * be generated for the given input, excluding the trailing 1400 * '\0', as per ISO C99. If you want to have the exact 1401 * number of characters written into @buf as return value 1402 * (not including the trailing '\0'), use vscnprintf(). If the 1403 * return is greater than or equal to @size, the resulting 1404 * string is truncated. 1405 */ 1406 int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) 1407 { 1408 unsigned long long num; 1409 char *str, *end, c; 1410 const char *args = (const char *)bin_buf; 1411 1412 struct printf_spec spec = {0}; 1413 1414 if (unlikely((int) size < 0)) { 1415 /* There can be only one.. */ 1416 static char warn = 1; 1417 WARN_ON(warn); 1418 warn = 0; 1419 return 0; 1420 } 1421 1422 str = buf; 1423 end = buf + size; 1424 1425 #define get_arg(type) \ 1426 ({ \ 1427 typeof(type) value; \ 1428 if (sizeof(type) == 8) { \ 1429 args = PTR_ALIGN(args, sizeof(u32)); \ 1430 *(u32 *)&value = *(u32 *)args; \ 1431 *((u32 *)&value + 1) = *(u32 *)(args + 4); \ 1432 } else { \ 1433 args = PTR_ALIGN(args, sizeof(type)); \ 1434 value = *(typeof(type) *)args; \ 1435 } \ 1436 args += sizeof(type); \ 1437 value; \ 1438 }) 1439 1440 /* Make sure end is always >= buf */ 1441 if (end < buf) { 1442 end = ((void *)-1); 1443 size = end - buf; 1444 } 1445 1446 while (*fmt) { 1447 int read; 1448 const char *old_fmt = fmt; 1449 1450 read = format_decode(fmt, &spec); 1451 1452 fmt += read; 1453 1454 switch (spec.type) { 1455 case FORMAT_TYPE_NONE: { 1456 int copy = read; 1457 if (str < end) { 1458 if (copy > end - str) 1459 copy = end - str; 1460 memcpy(str, old_fmt, copy); 1461 } 1462 str += read; 1463 break; 1464 } 1465 1466 case FORMAT_TYPE_WIDTH: 1467 spec.field_width = get_arg(int); 1468 break; 1469 1470 case FORMAT_TYPE_PRECISION: 1471 spec.precision = get_arg(int); 1472 break; 1473 1474 case FORMAT_TYPE_CHAR: 1475 if (!(spec.flags & LEFT)) { 1476 while (--spec.field_width > 0) { 1477 if (str < end) 1478 *str = ' '; 1479 ++str; 1480 } 1481 } 1482 c = (unsigned char) get_arg(char); 1483 if (str < end) 1484 *str = c; 1485 ++str; 1486 while (--spec.field_width > 0) { 1487 if (str < end) 1488 *str = ' '; 1489 ++str; 1490 } 1491 break; 1492 1493 case FORMAT_TYPE_STR: { 1494 const char *str_arg = args; 1495 size_t len = strlen(str_arg); 1496 args += len + 1; 1497 str = string(str, end, (char *)str_arg, spec); 1498 break; 1499 } 1500 1501 case FORMAT_TYPE_PTR: 1502 str = pointer(fmt+1, str, end, get_arg(void *), spec); 1503 while (isalnum(*fmt)) 1504 fmt++; 1505 break; 1506 1507 case FORMAT_TYPE_PERCENT_CHAR: 1508 if (str < end) 1509 *str = '%'; 1510 ++str; 1511 break; 1512 1513 case FORMAT_TYPE_INVALID: 1514 if (str < end) 1515 *str = '%'; 1516 ++str; 1517 break; 1518 1519 case FORMAT_TYPE_NRCHARS: 1520 /* skip */ 1521 break; 1522 1523 default: 1524 switch (spec.type) { 1525 1526 case FORMAT_TYPE_LONG_LONG: 1527 num = get_arg(long long); 1528 break; 1529 case FORMAT_TYPE_ULONG: 1530 num = get_arg(unsigned long); 1531 break; 1532 case FORMAT_TYPE_LONG: 1533 num = get_arg(unsigned long); 1534 break; 1535 case FORMAT_TYPE_SIZE_T: 1536 num = get_arg(size_t); 1537 break; 1538 case FORMAT_TYPE_PTRDIFF: 1539 num = get_arg(ptrdiff_t); 1540 break; 1541 case FORMAT_TYPE_USHORT: 1542 num = get_arg(unsigned short); 1543 break; 1544 case FORMAT_TYPE_SHORT: 1545 num = get_arg(short); 1546 break; 1547 case FORMAT_TYPE_UINT: 1548 num = get_arg(unsigned int); 1549 break; 1550 default: 1551 num = get_arg(int); 1552 } 1553 1554 str = number(str, end, num, spec); 1555 } 1556 } 1557 1558 if (size > 0) { 1559 if (str < end) 1560 *str = '\0'; 1561 else 1562 end[-1] = '\0'; 1563 } 1564 1565 #undef get_arg 1566 1567 /* the trailing null byte doesn't count towards the total */ 1568 return str - buf; 1569 } 1570 EXPORT_SYMBOL_GPL(bstr_printf); 1571 1572 /** 1573 * bprintf - Parse a format string and place args' binary value in a buffer 1574 * @bin_buf: The buffer to place args' binary value 1575 * @size: The size of the buffer(by words(32bits), not characters) 1576 * @fmt: The format string to use 1577 * @...: Arguments for the format string 1578 * 1579 * The function returns the number of words(u32) written 1580 * into @bin_buf. 1581 */ 1582 int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) 1583 { 1584 va_list args; 1585 int ret; 1586 1587 va_start(args, fmt); 1588 ret = vbin_printf(bin_buf, size, fmt, args); 1589 va_end(args); 1590 return ret; 1591 } 1592 EXPORT_SYMBOL_GPL(bprintf); 1593 1594 #endif /* CONFIG_BINARY_PRINTF */ 1595 1596 /** 1597 * vsscanf - Unformat a buffer into a list of arguments 1598 * @buf: input buffer 1599 * @fmt: format of buffer 1600 * @args: arguments 1601 */ 1602 int vsscanf(const char * buf, const char * fmt, va_list args) 1603 { 1604 const char *str = buf; 1605 char *next; 1606 char digit; 1607 int num = 0; 1608 int qualifier; 1609 int base; 1610 int field_width; 1611 int is_sign = 0; 1612 1613 while(*fmt && *str) { 1614 /* skip any white space in format */ 1615 /* white space in format matchs any amount of 1616 * white space, including none, in the input. 1617 */ 1618 if (isspace(*fmt)) { 1619 while (isspace(*fmt)) 1620 ++fmt; 1621 while (isspace(*str)) 1622 ++str; 1623 } 1624 1625 /* anything that is not a conversion must match exactly */ 1626 if (*fmt != '%' && *fmt) { 1627 if (*fmt++ != *str++) 1628 break; 1629 continue; 1630 } 1631 1632 if (!*fmt) 1633 break; 1634 ++fmt; 1635 1636 /* skip this conversion. 1637 * advance both strings to next white space 1638 */ 1639 if (*fmt == '*') { 1640 while (!isspace(*fmt) && *fmt) 1641 fmt++; 1642 while (!isspace(*str) && *str) 1643 str++; 1644 continue; 1645 } 1646 1647 /* get field width */ 1648 field_width = -1; 1649 if (isdigit(*fmt)) 1650 field_width = skip_atoi(&fmt); 1651 1652 /* get conversion qualifier */ 1653 qualifier = -1; 1654 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || 1655 *fmt == 'Z' || *fmt == 'z') { 1656 qualifier = *fmt++; 1657 if (unlikely(qualifier == *fmt)) { 1658 if (qualifier == 'h') { 1659 qualifier = 'H'; 1660 fmt++; 1661 } else if (qualifier == 'l') { 1662 qualifier = 'L'; 1663 fmt++; 1664 } 1665 } 1666 } 1667 base = 10; 1668 is_sign = 0; 1669 1670 if (!*fmt || !*str) 1671 break; 1672 1673 switch(*fmt++) { 1674 case 'c': 1675 { 1676 char *s = (char *) va_arg(args,char*); 1677 if (field_width == -1) 1678 field_width = 1; 1679 do { 1680 *s++ = *str++; 1681 } while (--field_width > 0 && *str); 1682 num++; 1683 } 1684 continue; 1685 case 's': 1686 { 1687 char *s = (char *) va_arg(args, char *); 1688 if(field_width == -1) 1689 field_width = INT_MAX; 1690 /* first, skip leading white space in buffer */ 1691 while (isspace(*str)) 1692 str++; 1693 1694 /* now copy until next white space */ 1695 while (*str && !isspace(*str) && field_width--) { 1696 *s++ = *str++; 1697 } 1698 *s = '\0'; 1699 num++; 1700 } 1701 continue; 1702 case 'n': 1703 /* return number of characters read so far */ 1704 { 1705 int *i = (int *)va_arg(args,int*); 1706 *i = str - buf; 1707 } 1708 continue; 1709 case 'o': 1710 base = 8; 1711 break; 1712 case 'x': 1713 case 'X': 1714 base = 16; 1715 break; 1716 case 'i': 1717 base = 0; 1718 case 'd': 1719 is_sign = 1; 1720 case 'u': 1721 break; 1722 case '%': 1723 /* looking for '%' in str */ 1724 if (*str++ != '%') 1725 return num; 1726 continue; 1727 default: 1728 /* invalid format; stop here */ 1729 return num; 1730 } 1731 1732 /* have some sort of integer conversion. 1733 * first, skip white space in buffer. 1734 */ 1735 while (isspace(*str)) 1736 str++; 1737 1738 digit = *str; 1739 if (is_sign && digit == '-') 1740 digit = *(str + 1); 1741 1742 if (!digit 1743 || (base == 16 && !isxdigit(digit)) 1744 || (base == 10 && !isdigit(digit)) 1745 || (base == 8 && (!isdigit(digit) || digit > '7')) 1746 || (base == 0 && !isdigit(digit))) 1747 break; 1748 1749 switch(qualifier) { 1750 case 'H': /* that's 'hh' in format */ 1751 if (is_sign) { 1752 signed char *s = (signed char *) va_arg(args,signed char *); 1753 *s = (signed char) simple_strtol(str,&next,base); 1754 } else { 1755 unsigned char *s = (unsigned char *) va_arg(args, unsigned char *); 1756 *s = (unsigned char) simple_strtoul(str, &next, base); 1757 } 1758 break; 1759 case 'h': 1760 if (is_sign) { 1761 short *s = (short *) va_arg(args,short *); 1762 *s = (short) simple_strtol(str,&next,base); 1763 } else { 1764 unsigned short *s = (unsigned short *) va_arg(args, unsigned short *); 1765 *s = (unsigned short) simple_strtoul(str, &next, base); 1766 } 1767 break; 1768 case 'l': 1769 if (is_sign) { 1770 long *l = (long *) va_arg(args,long *); 1771 *l = simple_strtol(str,&next,base); 1772 } else { 1773 unsigned long *l = (unsigned long*) va_arg(args,unsigned long*); 1774 *l = simple_strtoul(str,&next,base); 1775 } 1776 break; 1777 case 'L': 1778 if (is_sign) { 1779 long long *l = (long long*) va_arg(args,long long *); 1780 *l = simple_strtoll(str,&next,base); 1781 } else { 1782 unsigned long long *l = (unsigned long long*) va_arg(args,unsigned long long*); 1783 *l = simple_strtoull(str,&next,base); 1784 } 1785 break; 1786 case 'Z': 1787 case 'z': 1788 { 1789 size_t *s = (size_t*) va_arg(args,size_t*); 1790 *s = (size_t) simple_strtoul(str,&next,base); 1791 } 1792 break; 1793 default: 1794 if (is_sign) { 1795 int *i = (int *) va_arg(args, int*); 1796 *i = (int) simple_strtol(str,&next,base); 1797 } else { 1798 unsigned int *i = (unsigned int*) va_arg(args, unsigned int*); 1799 *i = (unsigned int) simple_strtoul(str,&next,base); 1800 } 1801 break; 1802 } 1803 num++; 1804 1805 if (!next) 1806 break; 1807 str = next; 1808 } 1809 1810 /* 1811 * Now we've come all the way through so either the input string or the 1812 * format ended. In the former case, there can be a %n at the current 1813 * position in the format that needs to be filled. 1814 */ 1815 if (*fmt == '%' && *(fmt + 1) == 'n') { 1816 int *p = (int *)va_arg(args, int *); 1817 *p = str - buf; 1818 } 1819 1820 return num; 1821 } 1822 EXPORT_SYMBOL(vsscanf); 1823 1824 /** 1825 * sscanf - Unformat a buffer into a list of arguments 1826 * @buf: input buffer 1827 * @fmt: formatting of buffer 1828 * @...: resulting arguments 1829 */ 1830 int sscanf(const char * buf, const char * fmt, ...) 1831 { 1832 va_list args; 1833 int i; 1834 1835 va_start(args,fmt); 1836 i = vsscanf(buf,fmt,args); 1837 va_end(args); 1838 return i; 1839 } 1840 EXPORT_SYMBOL(sscanf); 1841