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 <[email protected]> 14 * - changed to provide snprintf and vsnprintf functions 15 * So Feb 1 16:51:32 CET 2004 Juergen Quade <[email protected]> 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_WITDH, 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_WITDH) { 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_WITDH; 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_WITDH; 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_WITDH: 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 if (*fmt) { 1055 if (str < end) 1056 *str = *fmt; 1057 ++str; 1058 } else { 1059 --fmt; 1060 } 1061 break; 1062 1063 case FORMAT_TYPE_NRCHARS: { 1064 int qualifier = spec.qualifier; 1065 1066 if (qualifier == 'l') { 1067 long *ip = va_arg(args, long *); 1068 *ip = (str - buf); 1069 } else if (qualifier == 'Z' || 1070 qualifier == 'z') { 1071 size_t *ip = va_arg(args, size_t *); 1072 *ip = (str - buf); 1073 } else { 1074 int *ip = va_arg(args, int *); 1075 *ip = (str - buf); 1076 } 1077 break; 1078 } 1079 1080 default: 1081 switch (spec.type) { 1082 case FORMAT_TYPE_LONG_LONG: 1083 num = va_arg(args, long long); 1084 break; 1085 case FORMAT_TYPE_ULONG: 1086 num = va_arg(args, unsigned long); 1087 break; 1088 case FORMAT_TYPE_LONG: 1089 num = va_arg(args, long); 1090 break; 1091 case FORMAT_TYPE_SIZE_T: 1092 num = va_arg(args, size_t); 1093 break; 1094 case FORMAT_TYPE_PTRDIFF: 1095 num = va_arg(args, ptrdiff_t); 1096 break; 1097 case FORMAT_TYPE_USHORT: 1098 num = (unsigned short) va_arg(args, int); 1099 break; 1100 case FORMAT_TYPE_SHORT: 1101 num = (short) va_arg(args, int); 1102 break; 1103 case FORMAT_TYPE_INT: 1104 num = (int) va_arg(args, int); 1105 break; 1106 default: 1107 num = va_arg(args, unsigned int); 1108 } 1109 1110 str = number(str, end, num, spec); 1111 } 1112 } 1113 1114 if (size > 0) { 1115 if (str < end) 1116 *str = '\0'; 1117 else 1118 end[-1] = '\0'; 1119 } 1120 1121 /* the trailing null byte doesn't count towards the total */ 1122 return str-buf; 1123 1124 } 1125 EXPORT_SYMBOL(vsnprintf); 1126 1127 /** 1128 * vscnprintf - Format a string and place it in a buffer 1129 * @buf: The buffer to place the result into 1130 * @size: The size of the buffer, including the trailing null space 1131 * @fmt: The format string to use 1132 * @args: Arguments for the format string 1133 * 1134 * The return value is the number of characters which have been written into 1135 * the @buf not including the trailing '\0'. If @size is <= 0 the function 1136 * returns 0. 1137 * 1138 * Call this function if you are already dealing with a va_list. 1139 * You probably want scnprintf() instead. 1140 * 1141 * See the vsnprintf() documentation for format string extensions over C99. 1142 */ 1143 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) 1144 { 1145 int i; 1146 1147 i=vsnprintf(buf,size,fmt,args); 1148 return (i >= size) ? (size - 1) : i; 1149 } 1150 EXPORT_SYMBOL(vscnprintf); 1151 1152 /** 1153 * snprintf - Format a string and place it in a buffer 1154 * @buf: The buffer to place the result into 1155 * @size: The size of the buffer, including the trailing null space 1156 * @fmt: The format string to use 1157 * @...: Arguments for the format string 1158 * 1159 * The return value is the number of characters which would be 1160 * generated for the given input, excluding the trailing null, 1161 * as per ISO C99. If the return is greater than or equal to 1162 * @size, the resulting string is truncated. 1163 * 1164 * See the vsnprintf() documentation for format string extensions over C99. 1165 */ 1166 int snprintf(char * buf, size_t size, const char *fmt, ...) 1167 { 1168 va_list args; 1169 int i; 1170 1171 va_start(args, fmt); 1172 i=vsnprintf(buf,size,fmt,args); 1173 va_end(args); 1174 return i; 1175 } 1176 EXPORT_SYMBOL(snprintf); 1177 1178 /** 1179 * scnprintf - Format a string and place it in a buffer 1180 * @buf: The buffer to place the result into 1181 * @size: The size of the buffer, including the trailing null space 1182 * @fmt: The format string to use 1183 * @...: Arguments for the format string 1184 * 1185 * The return value is the number of characters written into @buf not including 1186 * the trailing '\0'. If @size is <= 0 the function returns 0. 1187 */ 1188 1189 int scnprintf(char * buf, size_t size, const char *fmt, ...) 1190 { 1191 va_list args; 1192 int i; 1193 1194 va_start(args, fmt); 1195 i = vsnprintf(buf, size, fmt, args); 1196 va_end(args); 1197 return (i >= size) ? (size - 1) : i; 1198 } 1199 EXPORT_SYMBOL(scnprintf); 1200 1201 /** 1202 * vsprintf - Format a string and place it in a buffer 1203 * @buf: The buffer to place the result into 1204 * @fmt: The format string to use 1205 * @args: Arguments for the format string 1206 * 1207 * The function returns the number of characters written 1208 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid 1209 * buffer overflows. 1210 * 1211 * Call this function if you are already dealing with a va_list. 1212 * You probably want sprintf() instead. 1213 * 1214 * See the vsnprintf() documentation for format string extensions over C99. 1215 */ 1216 int vsprintf(char *buf, const char *fmt, va_list args) 1217 { 1218 return vsnprintf(buf, INT_MAX, fmt, args); 1219 } 1220 EXPORT_SYMBOL(vsprintf); 1221 1222 /** 1223 * sprintf - Format a string and place it in a buffer 1224 * @buf: The buffer to place the result into 1225 * @fmt: The format string to use 1226 * @...: Arguments for the format string 1227 * 1228 * The function returns the number of characters written 1229 * into @buf. Use snprintf() or scnprintf() in order to avoid 1230 * buffer overflows. 1231 * 1232 * See the vsnprintf() documentation for format string extensions over C99. 1233 */ 1234 int sprintf(char * buf, const char *fmt, ...) 1235 { 1236 va_list args; 1237 int i; 1238 1239 va_start(args, fmt); 1240 i=vsnprintf(buf, INT_MAX, fmt, args); 1241 va_end(args); 1242 return i; 1243 } 1244 EXPORT_SYMBOL(sprintf); 1245 1246 #ifdef CONFIG_BINARY_PRINTF 1247 /* 1248 * bprintf service: 1249 * vbin_printf() - VA arguments to binary data 1250 * bstr_printf() - Binary data to text string 1251 */ 1252 1253 /** 1254 * vbin_printf - Parse a format string and place args' binary value in a buffer 1255 * @bin_buf: The buffer to place args' binary value 1256 * @size: The size of the buffer(by words(32bits), not characters) 1257 * @fmt: The format string to use 1258 * @args: Arguments for the format string 1259 * 1260 * The format follows C99 vsnprintf, except %n is ignored, and its argument 1261 * is skiped. 1262 * 1263 * The return value is the number of words(32bits) which would be generated for 1264 * the given input. 1265 * 1266 * NOTE: 1267 * If the return value is greater than @size, the resulting bin_buf is NOT 1268 * valid for bstr_printf(). 1269 */ 1270 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) 1271 { 1272 struct printf_spec spec = {0}; 1273 char *str, *end; 1274 int read; 1275 1276 str = (char *)bin_buf; 1277 end = (char *)(bin_buf + size); 1278 1279 #define save_arg(type) \ 1280 do { \ 1281 if (sizeof(type) == 8) { \ 1282 unsigned long long value; \ 1283 str = PTR_ALIGN(str, sizeof(u32)); \ 1284 value = va_arg(args, unsigned long long); \ 1285 if (str + sizeof(type) <= end) { \ 1286 *(u32 *)str = *(u32 *)&value; \ 1287 *(u32 *)(str + 4) = *((u32 *)&value + 1); \ 1288 } \ 1289 } else { \ 1290 unsigned long value; \ 1291 str = PTR_ALIGN(str, sizeof(type)); \ 1292 value = va_arg(args, int); \ 1293 if (str + sizeof(type) <= end) \ 1294 *(typeof(type) *)str = (type)value; \ 1295 } \ 1296 str += sizeof(type); \ 1297 } while (0) 1298 1299 1300 while (*fmt) { 1301 read = format_decode(fmt, &spec); 1302 1303 fmt += read; 1304 1305 switch (spec.type) { 1306 case FORMAT_TYPE_NONE: 1307 break; 1308 1309 case FORMAT_TYPE_WITDH: 1310 case FORMAT_TYPE_PRECISION: 1311 save_arg(int); 1312 break; 1313 1314 case FORMAT_TYPE_CHAR: 1315 save_arg(char); 1316 break; 1317 1318 case FORMAT_TYPE_STR: { 1319 const char *save_str = va_arg(args, char *); 1320 size_t len; 1321 if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE 1322 || (unsigned long)save_str < PAGE_SIZE) 1323 save_str = "<NULL>"; 1324 len = strlen(save_str); 1325 if (str + len + 1 < end) 1326 memcpy(str, save_str, len + 1); 1327 str += len + 1; 1328 break; 1329 } 1330 1331 case FORMAT_TYPE_PTR: 1332 save_arg(void *); 1333 /* skip all alphanumeric pointer suffixes */ 1334 while (isalnum(*fmt)) 1335 fmt++; 1336 break; 1337 1338 case FORMAT_TYPE_PERCENT_CHAR: 1339 break; 1340 1341 case FORMAT_TYPE_INVALID: 1342 if (!*fmt) 1343 --fmt; 1344 break; 1345 1346 case FORMAT_TYPE_NRCHARS: { 1347 /* skip %n 's argument */ 1348 int qualifier = spec.qualifier; 1349 void *skip_arg; 1350 if (qualifier == 'l') 1351 skip_arg = va_arg(args, long *); 1352 else if (qualifier == 'Z' || qualifier == 'z') 1353 skip_arg = va_arg(args, size_t *); 1354 else 1355 skip_arg = va_arg(args, int *); 1356 break; 1357 } 1358 1359 default: 1360 switch (spec.type) { 1361 1362 case FORMAT_TYPE_LONG_LONG: 1363 save_arg(long long); 1364 break; 1365 case FORMAT_TYPE_ULONG: 1366 case FORMAT_TYPE_LONG: 1367 save_arg(unsigned long); 1368 break; 1369 case FORMAT_TYPE_SIZE_T: 1370 save_arg(size_t); 1371 break; 1372 case FORMAT_TYPE_PTRDIFF: 1373 save_arg(ptrdiff_t); 1374 break; 1375 case FORMAT_TYPE_USHORT: 1376 case FORMAT_TYPE_SHORT: 1377 save_arg(short); 1378 break; 1379 default: 1380 save_arg(int); 1381 } 1382 } 1383 } 1384 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; 1385 1386 #undef save_arg 1387 } 1388 EXPORT_SYMBOL_GPL(vbin_printf); 1389 1390 /** 1391 * bstr_printf - Format a string from binary arguments and place it in a buffer 1392 * @buf: The buffer to place the result into 1393 * @size: The size of the buffer, including the trailing null space 1394 * @fmt: The format string to use 1395 * @bin_buf: Binary arguments for the format string 1396 * 1397 * This function like C99 vsnprintf, but the difference is that vsnprintf gets 1398 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is 1399 * a binary buffer that generated by vbin_printf. 1400 * 1401 * The format follows C99 vsnprintf, but has some extensions: 1402 * %pS output the name of a text symbol 1403 * %pF output the name of a function pointer 1404 * %pR output the address range in a struct resource 1405 * %n is ignored 1406 * 1407 * The return value is the number of characters which would 1408 * be generated for the given input, excluding the trailing 1409 * '\0', as per ISO C99. If you want to have the exact 1410 * number of characters written into @buf as return value 1411 * (not including the trailing '\0'), use vscnprintf(). If the 1412 * return is greater than or equal to @size, the resulting 1413 * string is truncated. 1414 */ 1415 int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) 1416 { 1417 unsigned long long num; 1418 char *str, *end, c; 1419 const char *args = (const char *)bin_buf; 1420 1421 struct printf_spec spec = {0}; 1422 1423 if (unlikely((int) size < 0)) { 1424 /* There can be only one.. */ 1425 static char warn = 1; 1426 WARN_ON(warn); 1427 warn = 0; 1428 return 0; 1429 } 1430 1431 str = buf; 1432 end = buf + size; 1433 1434 #define get_arg(type) \ 1435 ({ \ 1436 typeof(type) value; \ 1437 if (sizeof(type) == 8) { \ 1438 args = PTR_ALIGN(args, sizeof(u32)); \ 1439 *(u32 *)&value = *(u32 *)args; \ 1440 *((u32 *)&value + 1) = *(u32 *)(args + 4); \ 1441 } else { \ 1442 args = PTR_ALIGN(args, sizeof(type)); \ 1443 value = *(typeof(type) *)args; \ 1444 } \ 1445 args += sizeof(type); \ 1446 value; \ 1447 }) 1448 1449 /* Make sure end is always >= buf */ 1450 if (end < buf) { 1451 end = ((void *)-1); 1452 size = end - buf; 1453 } 1454 1455 while (*fmt) { 1456 int read; 1457 const char *old_fmt = fmt; 1458 1459 read = format_decode(fmt, &spec); 1460 1461 fmt += read; 1462 1463 switch (spec.type) { 1464 case FORMAT_TYPE_NONE: { 1465 int copy = read; 1466 if (str < end) { 1467 if (copy > end - str) 1468 copy = end - str; 1469 memcpy(str, old_fmt, copy); 1470 } 1471 str += read; 1472 break; 1473 } 1474 1475 case FORMAT_TYPE_WITDH: 1476 spec.field_width = get_arg(int); 1477 break; 1478 1479 case FORMAT_TYPE_PRECISION: 1480 spec.precision = get_arg(int); 1481 break; 1482 1483 case FORMAT_TYPE_CHAR: 1484 if (!(spec.flags & LEFT)) { 1485 while (--spec.field_width > 0) { 1486 if (str < end) 1487 *str = ' '; 1488 ++str; 1489 } 1490 } 1491 c = (unsigned char) get_arg(char); 1492 if (str < end) 1493 *str = c; 1494 ++str; 1495 while (--spec.field_width > 0) { 1496 if (str < end) 1497 *str = ' '; 1498 ++str; 1499 } 1500 break; 1501 1502 case FORMAT_TYPE_STR: { 1503 const char *str_arg = args; 1504 size_t len = strlen(str_arg); 1505 args += len + 1; 1506 str = string(str, end, (char *)str_arg, spec); 1507 break; 1508 } 1509 1510 case FORMAT_TYPE_PTR: 1511 str = pointer(fmt+1, str, end, get_arg(void *), spec); 1512 while (isalnum(*fmt)) 1513 fmt++; 1514 break; 1515 1516 case FORMAT_TYPE_PERCENT_CHAR: 1517 if (str < end) 1518 *str = '%'; 1519 ++str; 1520 break; 1521 1522 case FORMAT_TYPE_INVALID: 1523 if (str < end) 1524 *str = '%'; 1525 ++str; 1526 if (*fmt) { 1527 if (str < end) 1528 *str = *fmt; 1529 ++str; 1530 } else { 1531 --fmt; 1532 } 1533 break; 1534 1535 case FORMAT_TYPE_NRCHARS: 1536 /* skip */ 1537 break; 1538 1539 default: 1540 switch (spec.type) { 1541 1542 case FORMAT_TYPE_LONG_LONG: 1543 num = get_arg(long long); 1544 break; 1545 case FORMAT_TYPE_ULONG: 1546 num = get_arg(unsigned long); 1547 break; 1548 case FORMAT_TYPE_LONG: 1549 num = get_arg(unsigned long); 1550 break; 1551 case FORMAT_TYPE_SIZE_T: 1552 num = get_arg(size_t); 1553 break; 1554 case FORMAT_TYPE_PTRDIFF: 1555 num = get_arg(ptrdiff_t); 1556 break; 1557 case FORMAT_TYPE_USHORT: 1558 num = get_arg(unsigned short); 1559 break; 1560 case FORMAT_TYPE_SHORT: 1561 num = get_arg(short); 1562 break; 1563 case FORMAT_TYPE_UINT: 1564 num = get_arg(unsigned int); 1565 break; 1566 default: 1567 num = get_arg(int); 1568 } 1569 1570 str = number(str, end, num, spec); 1571 } 1572 } 1573 1574 if (size > 0) { 1575 if (str < end) 1576 *str = '\0'; 1577 else 1578 end[-1] = '\0'; 1579 } 1580 1581 #undef get_arg 1582 1583 /* the trailing null byte doesn't count towards the total */ 1584 return str - buf; 1585 } 1586 EXPORT_SYMBOL_GPL(bstr_printf); 1587 1588 /** 1589 * bprintf - Parse a format string and place args' binary value in a buffer 1590 * @bin_buf: The buffer to place args' binary value 1591 * @size: The size of the buffer(by words(32bits), not characters) 1592 * @fmt: The format string to use 1593 * @...: Arguments for the format string 1594 * 1595 * The function returns the number of words(u32) written 1596 * into @bin_buf. 1597 */ 1598 int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) 1599 { 1600 va_list args; 1601 int ret; 1602 1603 va_start(args, fmt); 1604 ret = vbin_printf(bin_buf, size, fmt, args); 1605 va_end(args); 1606 return ret; 1607 } 1608 EXPORT_SYMBOL_GPL(bprintf); 1609 1610 #endif /* CONFIG_BINARY_PRINTF */ 1611 1612 /** 1613 * vsscanf - Unformat a buffer into a list of arguments 1614 * @buf: input buffer 1615 * @fmt: format of buffer 1616 * @args: arguments 1617 */ 1618 int vsscanf(const char * buf, const char * fmt, va_list args) 1619 { 1620 const char *str = buf; 1621 char *next; 1622 char digit; 1623 int num = 0; 1624 int qualifier; 1625 int base; 1626 int field_width; 1627 int is_sign = 0; 1628 1629 while(*fmt && *str) { 1630 /* skip any white space in format */ 1631 /* white space in format matchs any amount of 1632 * white space, including none, in the input. 1633 */ 1634 if (isspace(*fmt)) { 1635 while (isspace(*fmt)) 1636 ++fmt; 1637 while (isspace(*str)) 1638 ++str; 1639 } 1640 1641 /* anything that is not a conversion must match exactly */ 1642 if (*fmt != '%' && *fmt) { 1643 if (*fmt++ != *str++) 1644 break; 1645 continue; 1646 } 1647 1648 if (!*fmt) 1649 break; 1650 ++fmt; 1651 1652 /* skip this conversion. 1653 * advance both strings to next white space 1654 */ 1655 if (*fmt == '*') { 1656 while (!isspace(*fmt) && *fmt) 1657 fmt++; 1658 while (!isspace(*str) && *str) 1659 str++; 1660 continue; 1661 } 1662 1663 /* get field width */ 1664 field_width = -1; 1665 if (isdigit(*fmt)) 1666 field_width = skip_atoi(&fmt); 1667 1668 /* get conversion qualifier */ 1669 qualifier = -1; 1670 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || 1671 *fmt == 'Z' || *fmt == 'z') { 1672 qualifier = *fmt++; 1673 if (unlikely(qualifier == *fmt)) { 1674 if (qualifier == 'h') { 1675 qualifier = 'H'; 1676 fmt++; 1677 } else if (qualifier == 'l') { 1678 qualifier = 'L'; 1679 fmt++; 1680 } 1681 } 1682 } 1683 base = 10; 1684 is_sign = 0; 1685 1686 if (!*fmt || !*str) 1687 break; 1688 1689 switch(*fmt++) { 1690 case 'c': 1691 { 1692 char *s = (char *) va_arg(args,char*); 1693 if (field_width == -1) 1694 field_width = 1; 1695 do { 1696 *s++ = *str++; 1697 } while (--field_width > 0 && *str); 1698 num++; 1699 } 1700 continue; 1701 case 's': 1702 { 1703 char *s = (char *) va_arg(args, char *); 1704 if(field_width == -1) 1705 field_width = INT_MAX; 1706 /* first, skip leading white space in buffer */ 1707 while (isspace(*str)) 1708 str++; 1709 1710 /* now copy until next white space */ 1711 while (*str && !isspace(*str) && field_width--) { 1712 *s++ = *str++; 1713 } 1714 *s = '\0'; 1715 num++; 1716 } 1717 continue; 1718 case 'n': 1719 /* return number of characters read so far */ 1720 { 1721 int *i = (int *)va_arg(args,int*); 1722 *i = str - buf; 1723 } 1724 continue; 1725 case 'o': 1726 base = 8; 1727 break; 1728 case 'x': 1729 case 'X': 1730 base = 16; 1731 break; 1732 case 'i': 1733 base = 0; 1734 case 'd': 1735 is_sign = 1; 1736 case 'u': 1737 break; 1738 case '%': 1739 /* looking for '%' in str */ 1740 if (*str++ != '%') 1741 return num; 1742 continue; 1743 default: 1744 /* invalid format; stop here */ 1745 return num; 1746 } 1747 1748 /* have some sort of integer conversion. 1749 * first, skip white space in buffer. 1750 */ 1751 while (isspace(*str)) 1752 str++; 1753 1754 digit = *str; 1755 if (is_sign && digit == '-') 1756 digit = *(str + 1); 1757 1758 if (!digit 1759 || (base == 16 && !isxdigit(digit)) 1760 || (base == 10 && !isdigit(digit)) 1761 || (base == 8 && (!isdigit(digit) || digit > '7')) 1762 || (base == 0 && !isdigit(digit))) 1763 break; 1764 1765 switch(qualifier) { 1766 case 'H': /* that's 'hh' in format */ 1767 if (is_sign) { 1768 signed char *s = (signed char *) va_arg(args,signed char *); 1769 *s = (signed char) simple_strtol(str,&next,base); 1770 } else { 1771 unsigned char *s = (unsigned char *) va_arg(args, unsigned char *); 1772 *s = (unsigned char) simple_strtoul(str, &next, base); 1773 } 1774 break; 1775 case 'h': 1776 if (is_sign) { 1777 short *s = (short *) va_arg(args,short *); 1778 *s = (short) simple_strtol(str,&next,base); 1779 } else { 1780 unsigned short *s = (unsigned short *) va_arg(args, unsigned short *); 1781 *s = (unsigned short) simple_strtoul(str, &next, base); 1782 } 1783 break; 1784 case 'l': 1785 if (is_sign) { 1786 long *l = (long *) va_arg(args,long *); 1787 *l = simple_strtol(str,&next,base); 1788 } else { 1789 unsigned long *l = (unsigned long*) va_arg(args,unsigned long*); 1790 *l = simple_strtoul(str,&next,base); 1791 } 1792 break; 1793 case 'L': 1794 if (is_sign) { 1795 long long *l = (long long*) va_arg(args,long long *); 1796 *l = simple_strtoll(str,&next,base); 1797 } else { 1798 unsigned long long *l = (unsigned long long*) va_arg(args,unsigned long long*); 1799 *l = simple_strtoull(str,&next,base); 1800 } 1801 break; 1802 case 'Z': 1803 case 'z': 1804 { 1805 size_t *s = (size_t*) va_arg(args,size_t*); 1806 *s = (size_t) simple_strtoul(str,&next,base); 1807 } 1808 break; 1809 default: 1810 if (is_sign) { 1811 int *i = (int *) va_arg(args, int*); 1812 *i = (int) simple_strtol(str,&next,base); 1813 } else { 1814 unsigned int *i = (unsigned int*) va_arg(args, unsigned int*); 1815 *i = (unsigned int) simple_strtoul(str,&next,base); 1816 } 1817 break; 1818 } 1819 num++; 1820 1821 if (!next) 1822 break; 1823 str = next; 1824 } 1825 1826 /* 1827 * Now we've come all the way through so either the input string or the 1828 * format ended. In the former case, there can be a %n at the current 1829 * position in the format that needs to be filled. 1830 */ 1831 if (*fmt == '%' && *(fmt + 1) == 'n') { 1832 int *p = (int *)va_arg(args, int *); 1833 *p = str - buf; 1834 } 1835 1836 return num; 1837 } 1838 EXPORT_SYMBOL(vsscanf); 1839 1840 /** 1841 * sscanf - Unformat a buffer into a list of arguments 1842 * @buf: input buffer 1843 * @fmt: formatting of buffer 1844 * @...: resulting arguments 1845 */ 1846 int sscanf(const char * buf, const char * fmt, ...) 1847 { 1848 va_list args; 1849 int i; 1850 1851 va_start(args,fmt); 1852 i = vsscanf(buf,fmt,args); 1853 va_end(args); 1854 return i; 1855 } 1856 EXPORT_SYMBOL(sscanf); 1857