1 /* 2 * linux/lib/vsprintf.c 3 * 4 * Copyright (C) 1991, 1992 Linus Torvalds 5 */ 6 7 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */ 8 /* 9 * Wirzenius wrote this portably, Torvalds fucked it up :-) 10 */ 11 12 /* 13 * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com> 14 * - changed to provide snprintf and vsnprintf functions 15 * So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de> 16 * - scnprintf and vscnprintf 17 */ 18 19 #include <stdarg.h> 20 #include <linux/module.h> /* for KSYM_SYMBOL_LEN */ 21 #include <linux/types.h> 22 #include <linux/string.h> 23 #include <linux/ctype.h> 24 #include <linux/kernel.h> 25 #include <linux/kallsyms.h> 26 #include <linux/math64.h> 27 #include <linux/uaccess.h> 28 #include <linux/ioport.h> 29 #include <net/addrconf.h> 30 31 #include <asm/page.h> /* for PAGE_SIZE */ 32 #include <asm/sections.h> /* for dereference_function_descriptor() */ 33 34 #include "kstrtox.h" 35 36 /** 37 * simple_strtoull - convert a string to an unsigned long long 38 * @cp: The start of the string 39 * @endp: A pointer to the end of the parsed string will be placed here 40 * @base: The number base to use 41 * 42 * This function is obsolete. Please use kstrtoull instead. 43 */ 44 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) 45 { 46 unsigned long long result; 47 unsigned int rv; 48 49 cp = _parse_integer_fixup_radix(cp, &base); 50 rv = _parse_integer(cp, base, &result); 51 /* FIXME */ 52 cp += (rv & ~KSTRTOX_OVERFLOW); 53 54 if (endp) 55 *endp = (char *)cp; 56 57 return result; 58 } 59 EXPORT_SYMBOL(simple_strtoull); 60 61 /** 62 * simple_strtoul - convert a string to an unsigned long 63 * @cp: The start of the string 64 * @endp: A pointer to the end of the parsed string will be placed here 65 * @base: The number base to use 66 * 67 * This function is obsolete. Please use kstrtoul instead. 68 */ 69 unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) 70 { 71 return simple_strtoull(cp, endp, base); 72 } 73 EXPORT_SYMBOL(simple_strtoul); 74 75 /** 76 * simple_strtol - convert a string to a signed long 77 * @cp: The start of the string 78 * @endp: A pointer to the end of the parsed string will be placed here 79 * @base: The number base to use 80 * 81 * This function is obsolete. Please use kstrtol instead. 82 */ 83 long simple_strtol(const char *cp, char **endp, unsigned int base) 84 { 85 if (*cp == '-') 86 return -simple_strtoul(cp + 1, endp, base); 87 88 return simple_strtoul(cp, endp, base); 89 } 90 EXPORT_SYMBOL(simple_strtol); 91 92 /** 93 * simple_strtoll - convert a string to a signed long long 94 * @cp: The start of the string 95 * @endp: A pointer to the end of the parsed string will be placed here 96 * @base: The number base to use 97 * 98 * This function is obsolete. Please use kstrtoll instead. 99 */ 100 long long simple_strtoll(const char *cp, char **endp, unsigned int base) 101 { 102 if (*cp == '-') 103 return -simple_strtoull(cp + 1, endp, base); 104 105 return simple_strtoull(cp, endp, base); 106 } 107 EXPORT_SYMBOL(simple_strtoll); 108 109 static noinline_for_stack 110 int skip_atoi(const char **s) 111 { 112 int i = 0; 113 114 while (isdigit(**s)) 115 i = i*10 + *((*s)++) - '0'; 116 117 return i; 118 } 119 120 /* Decimal conversion is by far the most typical, and is used 121 * for /proc and /sys data. This directly impacts e.g. top performance 122 * with many processes running. We optimize it for speed 123 * using ideas described at <http://www.cs.uiowa.edu/~jones/bcd/divide.html> 124 * (with permission from the author, Douglas W. Jones). 125 */ 126 127 #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64 128 /* Formats correctly any integer in [0, 999999999] */ 129 static noinline_for_stack 130 char *put_dec_full9(char *buf, unsigned q) 131 { 132 unsigned r; 133 134 /* 135 * Possible ways to approx. divide by 10 136 * (x * 0x1999999a) >> 32 x < 1073741829 (multiply must be 64-bit) 137 * (x * 0xcccd) >> 19 x < 81920 (x < 262149 when 64-bit mul) 138 * (x * 0x6667) >> 18 x < 43699 139 * (x * 0x3334) >> 17 x < 16389 140 * (x * 0x199a) >> 16 x < 16389 141 * (x * 0x0ccd) >> 15 x < 16389 142 * (x * 0x0667) >> 14 x < 2739 143 * (x * 0x0334) >> 13 x < 1029 144 * (x * 0x019a) >> 12 x < 1029 145 * (x * 0x00cd) >> 11 x < 1029 shorter code than * 0x67 (on i386) 146 * (x * 0x0067) >> 10 x < 179 147 * (x * 0x0034) >> 9 x < 69 same 148 * (x * 0x001a) >> 8 x < 69 same 149 * (x * 0x000d) >> 7 x < 69 same, shortest code (on i386) 150 * (x * 0x0007) >> 6 x < 19 151 * See <http://www.cs.uiowa.edu/~jones/bcd/divide.html> 152 */ 153 r = (q * (uint64_t)0x1999999a) >> 32; 154 *buf++ = (q - 10 * r) + '0'; /* 1 */ 155 q = (r * (uint64_t)0x1999999a) >> 32; 156 *buf++ = (r - 10 * q) + '0'; /* 2 */ 157 r = (q * (uint64_t)0x1999999a) >> 32; 158 *buf++ = (q - 10 * r) + '0'; /* 3 */ 159 q = (r * (uint64_t)0x1999999a) >> 32; 160 *buf++ = (r - 10 * q) + '0'; /* 4 */ 161 r = (q * (uint64_t)0x1999999a) >> 32; 162 *buf++ = (q - 10 * r) + '0'; /* 5 */ 163 /* Now value is under 10000, can avoid 64-bit multiply */ 164 q = (r * 0x199a) >> 16; 165 *buf++ = (r - 10 * q) + '0'; /* 6 */ 166 r = (q * 0xcd) >> 11; 167 *buf++ = (q - 10 * r) + '0'; /* 7 */ 168 q = (r * 0xcd) >> 11; 169 *buf++ = (r - 10 * q) + '0'; /* 8 */ 170 *buf++ = q + '0'; /* 9 */ 171 return buf; 172 } 173 #endif 174 175 /* Similar to above but do not pad with zeros. 176 * Code can be easily arranged to print 9 digits too, but our callers 177 * always call put_dec_full9() instead when the number has 9 decimal digits. 178 */ 179 static noinline_for_stack 180 char *put_dec_trunc8(char *buf, unsigned r) 181 { 182 unsigned q; 183 184 /* Copy of previous function's body with added early returns */ 185 while (r >= 10000) { 186 q = r + '0'; 187 r = (r * (uint64_t)0x1999999a) >> 32; 188 *buf++ = q - 10*r; 189 } 190 191 q = (r * 0x199a) >> 16; /* r <= 9999 */ 192 *buf++ = (r - 10 * q) + '0'; 193 if (q == 0) 194 return buf; 195 r = (q * 0xcd) >> 11; /* q <= 999 */ 196 *buf++ = (q - 10 * r) + '0'; 197 if (r == 0) 198 return buf; 199 q = (r * 0xcd) >> 11; /* r <= 99 */ 200 *buf++ = (r - 10 * q) + '0'; 201 if (q == 0) 202 return buf; 203 *buf++ = q + '0'; /* q <= 9 */ 204 return buf; 205 } 206 207 /* There are two algorithms to print larger numbers. 208 * One is generic: divide by 1000000000 and repeatedly print 209 * groups of (up to) 9 digits. It's conceptually simple, 210 * but requires a (unsigned long long) / 1000000000 division. 211 * 212 * Second algorithm splits 64-bit unsigned long long into 16-bit chunks, 213 * manipulates them cleverly and generates groups of 4 decimal digits. 214 * It so happens that it does NOT require long long division. 215 * 216 * If long is > 32 bits, division of 64-bit values is relatively easy, 217 * and we will use the first algorithm. 218 * If long long is > 64 bits (strange architecture with VERY large long long), 219 * second algorithm can't be used, and we again use the first one. 220 * 221 * Else (if long is 32 bits and long long is 64 bits) we use second one. 222 */ 223 224 #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64 225 226 /* First algorithm: generic */ 227 228 static 229 char *put_dec(char *buf, unsigned long long n) 230 { 231 if (n >= 100*1000*1000) { 232 while (n >= 1000*1000*1000) 233 buf = put_dec_full9(buf, do_div(n, 1000*1000*1000)); 234 if (n >= 100*1000*1000) 235 return put_dec_full9(buf, n); 236 } 237 return put_dec_trunc8(buf, n); 238 } 239 240 #else 241 242 /* Second algorithm: valid only for 64-bit long longs */ 243 244 /* See comment in put_dec_full9 for choice of constants */ 245 static noinline_for_stack 246 void put_dec_full4(char *buf, unsigned q) 247 { 248 unsigned r; 249 r = (q * 0xccd) >> 15; 250 buf[0] = (q - 10 * r) + '0'; 251 q = (r * 0xcd) >> 11; 252 buf[1] = (r - 10 * q) + '0'; 253 r = (q * 0xcd) >> 11; 254 buf[2] = (q - 10 * r) + '0'; 255 buf[3] = r + '0'; 256 } 257 258 /* 259 * Call put_dec_full4 on x % 10000, return x / 10000. 260 * The approximation x/10000 == (x * 0x346DC5D7) >> 43 261 * holds for all x < 1,128,869,999. The largest value this 262 * helper will ever be asked to convert is 1,125,520,955. 263 * (d1 in the put_dec code, assuming n is all-ones). 264 */ 265 static 266 unsigned put_dec_helper4(char *buf, unsigned x) 267 { 268 uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43; 269 270 put_dec_full4(buf, x - q * 10000); 271 return q; 272 } 273 274 /* Based on code by Douglas W. Jones found at 275 * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour> 276 * (with permission from the author). 277 * Performs no 64-bit division and hence should be fast on 32-bit machines. 278 */ 279 static 280 char *put_dec(char *buf, unsigned long long n) 281 { 282 uint32_t d3, d2, d1, q, h; 283 284 if (n < 100*1000*1000) 285 return put_dec_trunc8(buf, n); 286 287 d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */ 288 h = (n >> 32); 289 d2 = (h ) & 0xffff; 290 d3 = (h >> 16); /* implicit "& 0xffff" */ 291 292 q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff); 293 q = put_dec_helper4(buf, q); 294 295 q += 7671 * d3 + 9496 * d2 + 6 * d1; 296 q = put_dec_helper4(buf+4, q); 297 298 q += 4749 * d3 + 42 * d2; 299 q = put_dec_helper4(buf+8, q); 300 301 q += 281 * d3; 302 buf += 12; 303 if (q) 304 buf = put_dec_trunc8(buf, q); 305 else while (buf[-1] == '0') 306 --buf; 307 308 return buf; 309 } 310 311 #endif 312 313 /* 314 * Convert passed number to decimal string. 315 * Returns the length of string. On buffer overflow, returns 0. 316 * 317 * If speed is not important, use snprintf(). It's easy to read the code. 318 */ 319 int num_to_str(char *buf, int size, unsigned long long num) 320 { 321 char tmp[sizeof(num) * 3]; 322 int idx, len; 323 324 /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */ 325 if (num <= 9) { 326 tmp[0] = '0' + num; 327 len = 1; 328 } else { 329 len = put_dec(tmp, num) - tmp; 330 } 331 332 if (len > size) 333 return 0; 334 for (idx = 0; idx < len; ++idx) 335 buf[idx] = tmp[len - idx - 1]; 336 return len; 337 } 338 339 #define ZEROPAD 1 /* pad with zero */ 340 #define SIGN 2 /* unsigned/signed long */ 341 #define PLUS 4 /* show plus */ 342 #define SPACE 8 /* space if plus */ 343 #define LEFT 16 /* left justified */ 344 #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ 345 #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ 346 347 enum format_type { 348 FORMAT_TYPE_NONE, /* Just a string part */ 349 FORMAT_TYPE_WIDTH, 350 FORMAT_TYPE_PRECISION, 351 FORMAT_TYPE_CHAR, 352 FORMAT_TYPE_STR, 353 FORMAT_TYPE_PTR, 354 FORMAT_TYPE_PERCENT_CHAR, 355 FORMAT_TYPE_INVALID, 356 FORMAT_TYPE_LONG_LONG, 357 FORMAT_TYPE_ULONG, 358 FORMAT_TYPE_LONG, 359 FORMAT_TYPE_UBYTE, 360 FORMAT_TYPE_BYTE, 361 FORMAT_TYPE_USHORT, 362 FORMAT_TYPE_SHORT, 363 FORMAT_TYPE_UINT, 364 FORMAT_TYPE_INT, 365 FORMAT_TYPE_NRCHARS, 366 FORMAT_TYPE_SIZE_T, 367 FORMAT_TYPE_PTRDIFF 368 }; 369 370 struct printf_spec { 371 u8 type; /* format_type enum */ 372 u8 flags; /* flags to number() */ 373 u8 base; /* number base, 8, 10 or 16 only */ 374 u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */ 375 s16 field_width; /* width of output field */ 376 s16 precision; /* # of digits/chars */ 377 }; 378 379 static noinline_for_stack 380 char *number(char *buf, char *end, unsigned long long num, 381 struct printf_spec spec) 382 { 383 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ 384 static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ 385 386 char tmp[66]; 387 char sign; 388 char locase; 389 int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); 390 int i; 391 bool is_zero = num == 0LL; 392 393 /* locase = 0 or 0x20. ORing digits or letters with 'locase' 394 * produces same digits or (maybe lowercased) letters */ 395 locase = (spec.flags & SMALL); 396 if (spec.flags & LEFT) 397 spec.flags &= ~ZEROPAD; 398 sign = 0; 399 if (spec.flags & SIGN) { 400 if ((signed long long)num < 0) { 401 sign = '-'; 402 num = -(signed long long)num; 403 spec.field_width--; 404 } else if (spec.flags & PLUS) { 405 sign = '+'; 406 spec.field_width--; 407 } else if (spec.flags & SPACE) { 408 sign = ' '; 409 spec.field_width--; 410 } 411 } 412 if (need_pfx) { 413 if (spec.base == 16) 414 spec.field_width -= 2; 415 else if (!is_zero) 416 spec.field_width--; 417 } 418 419 /* generate full string in tmp[], in reverse order */ 420 i = 0; 421 if (num < spec.base) 422 tmp[i++] = digits[num] | locase; 423 /* Generic code, for any base: 424 else do { 425 tmp[i++] = (digits[do_div(num,base)] | locase); 426 } while (num != 0); 427 */ 428 else if (spec.base != 10) { /* 8 or 16 */ 429 int mask = spec.base - 1; 430 int shift = 3; 431 432 if (spec.base == 16) 433 shift = 4; 434 do { 435 tmp[i++] = (digits[((unsigned char)num) & mask] | locase); 436 num >>= shift; 437 } while (num); 438 } else { /* base 10 */ 439 i = put_dec(tmp, num) - tmp; 440 } 441 442 /* printing 100 using %2d gives "100", not "00" */ 443 if (i > spec.precision) 444 spec.precision = i; 445 /* leading space padding */ 446 spec.field_width -= spec.precision; 447 if (!(spec.flags & (ZEROPAD+LEFT))) { 448 while (--spec.field_width >= 0) { 449 if (buf < end) 450 *buf = ' '; 451 ++buf; 452 } 453 } 454 /* sign */ 455 if (sign) { 456 if (buf < end) 457 *buf = sign; 458 ++buf; 459 } 460 /* "0x" / "0" prefix */ 461 if (need_pfx) { 462 if (spec.base == 16 || !is_zero) { 463 if (buf < end) 464 *buf = '0'; 465 ++buf; 466 } 467 if (spec.base == 16) { 468 if (buf < end) 469 *buf = ('X' | locase); 470 ++buf; 471 } 472 } 473 /* zero or space padding */ 474 if (!(spec.flags & LEFT)) { 475 char c = (spec.flags & ZEROPAD) ? '0' : ' '; 476 while (--spec.field_width >= 0) { 477 if (buf < end) 478 *buf = c; 479 ++buf; 480 } 481 } 482 /* hmm even more zero padding? */ 483 while (i <= --spec.precision) { 484 if (buf < end) 485 *buf = '0'; 486 ++buf; 487 } 488 /* actual digits of result */ 489 while (--i >= 0) { 490 if (buf < end) 491 *buf = tmp[i]; 492 ++buf; 493 } 494 /* trailing space padding */ 495 while (--spec.field_width >= 0) { 496 if (buf < end) 497 *buf = ' '; 498 ++buf; 499 } 500 501 return buf; 502 } 503 504 static noinline_for_stack 505 char *string(char *buf, char *end, const char *s, struct printf_spec spec) 506 { 507 int len, i; 508 509 if ((unsigned long)s < PAGE_SIZE) 510 s = "(null)"; 511 512 len = strnlen(s, spec.precision); 513 514 if (!(spec.flags & LEFT)) { 515 while (len < spec.field_width--) { 516 if (buf < end) 517 *buf = ' '; 518 ++buf; 519 } 520 } 521 for (i = 0; i < len; ++i) { 522 if (buf < end) 523 *buf = *s; 524 ++buf; ++s; 525 } 526 while (len < spec.field_width--) { 527 if (buf < end) 528 *buf = ' '; 529 ++buf; 530 } 531 532 return buf; 533 } 534 535 static noinline_for_stack 536 char *symbol_string(char *buf, char *end, void *ptr, 537 struct printf_spec spec, const char *fmt) 538 { 539 unsigned long value; 540 #ifdef CONFIG_KALLSYMS 541 char sym[KSYM_SYMBOL_LEN]; 542 #endif 543 544 if (fmt[1] == 'R') 545 ptr = __builtin_extract_return_addr(ptr); 546 value = (unsigned long)ptr; 547 548 #ifdef CONFIG_KALLSYMS 549 if (*fmt == 'B') 550 sprint_backtrace(sym, value); 551 else if (*fmt != 'f' && *fmt != 's') 552 sprint_symbol(sym, value); 553 else 554 sprint_symbol_no_offset(sym, value); 555 556 return string(buf, end, sym, spec); 557 #else 558 spec.field_width = 2 * sizeof(void *); 559 spec.flags |= SPECIAL | SMALL | ZEROPAD; 560 spec.base = 16; 561 562 return number(buf, end, value, spec); 563 #endif 564 } 565 566 static noinline_for_stack 567 char *resource_string(char *buf, char *end, struct resource *res, 568 struct printf_spec spec, const char *fmt) 569 { 570 #ifndef IO_RSRC_PRINTK_SIZE 571 #define IO_RSRC_PRINTK_SIZE 6 572 #endif 573 574 #ifndef MEM_RSRC_PRINTK_SIZE 575 #define MEM_RSRC_PRINTK_SIZE 10 576 #endif 577 static const struct printf_spec io_spec = { 578 .base = 16, 579 .field_width = IO_RSRC_PRINTK_SIZE, 580 .precision = -1, 581 .flags = SPECIAL | SMALL | ZEROPAD, 582 }; 583 static const struct printf_spec mem_spec = { 584 .base = 16, 585 .field_width = MEM_RSRC_PRINTK_SIZE, 586 .precision = -1, 587 .flags = SPECIAL | SMALL | ZEROPAD, 588 }; 589 static const struct printf_spec bus_spec = { 590 .base = 16, 591 .field_width = 2, 592 .precision = -1, 593 .flags = SMALL | ZEROPAD, 594 }; 595 static const struct printf_spec dec_spec = { 596 .base = 10, 597 .precision = -1, 598 .flags = 0, 599 }; 600 static const struct printf_spec str_spec = { 601 .field_width = -1, 602 .precision = 10, 603 .flags = LEFT, 604 }; 605 static const struct printf_spec flag_spec = { 606 .base = 16, 607 .precision = -1, 608 .flags = SPECIAL | SMALL, 609 }; 610 611 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) 612 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ 613 #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) 614 #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) 615 #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") 616 #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") 617 char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, 618 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; 619 620 char *p = sym, *pend = sym + sizeof(sym); 621 int decode = (fmt[0] == 'R') ? 1 : 0; 622 const struct printf_spec *specp; 623 624 *p++ = '['; 625 if (res->flags & IORESOURCE_IO) { 626 p = string(p, pend, "io ", str_spec); 627 specp = &io_spec; 628 } else if (res->flags & IORESOURCE_MEM) { 629 p = string(p, pend, "mem ", str_spec); 630 specp = &mem_spec; 631 } else if (res->flags & IORESOURCE_IRQ) { 632 p = string(p, pend, "irq ", str_spec); 633 specp = &dec_spec; 634 } else if (res->flags & IORESOURCE_DMA) { 635 p = string(p, pend, "dma ", str_spec); 636 specp = &dec_spec; 637 } else if (res->flags & IORESOURCE_BUS) { 638 p = string(p, pend, "bus ", str_spec); 639 specp = &bus_spec; 640 } else { 641 p = string(p, pend, "??? ", str_spec); 642 specp = &mem_spec; 643 decode = 0; 644 } 645 p = number(p, pend, res->start, *specp); 646 if (res->start != res->end) { 647 *p++ = '-'; 648 p = number(p, pend, res->end, *specp); 649 } 650 if (decode) { 651 if (res->flags & IORESOURCE_MEM_64) 652 p = string(p, pend, " 64bit", str_spec); 653 if (res->flags & IORESOURCE_PREFETCH) 654 p = string(p, pend, " pref", str_spec); 655 if (res->flags & IORESOURCE_WINDOW) 656 p = string(p, pend, " window", str_spec); 657 if (res->flags & IORESOURCE_DISABLED) 658 p = string(p, pend, " disabled", str_spec); 659 } else { 660 p = string(p, pend, " flags ", str_spec); 661 p = number(p, pend, res->flags, flag_spec); 662 } 663 *p++ = ']'; 664 *p = '\0'; 665 666 return string(buf, end, sym, spec); 667 } 668 669 static noinline_for_stack 670 char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, 671 const char *fmt) 672 { 673 int i, len = 1; /* if we pass '%ph[CDN]', field width remains 674 negative value, fallback to the default */ 675 char separator; 676 677 if (spec.field_width == 0) 678 /* nothing to print */ 679 return buf; 680 681 if (ZERO_OR_NULL_PTR(addr)) 682 /* NULL pointer */ 683 return string(buf, end, NULL, spec); 684 685 switch (fmt[1]) { 686 case 'C': 687 separator = ':'; 688 break; 689 case 'D': 690 separator = '-'; 691 break; 692 case 'N': 693 separator = 0; 694 break; 695 default: 696 separator = ' '; 697 break; 698 } 699 700 if (spec.field_width > 0) 701 len = min_t(int, spec.field_width, 64); 702 703 for (i = 0; i < len && buf < end - 1; i++) { 704 buf = hex_byte_pack(buf, addr[i]); 705 706 if (buf < end && separator && i != len - 1) 707 *buf++ = separator; 708 } 709 710 return buf; 711 } 712 713 static noinline_for_stack 714 char *mac_address_string(char *buf, char *end, u8 *addr, 715 struct printf_spec spec, const char *fmt) 716 { 717 char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; 718 char *p = mac_addr; 719 int i; 720 char separator; 721 bool reversed = false; 722 723 switch (fmt[1]) { 724 case 'F': 725 separator = '-'; 726 break; 727 728 case 'R': 729 reversed = true; 730 /* fall through */ 731 732 default: 733 separator = ':'; 734 break; 735 } 736 737 for (i = 0; i < 6; i++) { 738 if (reversed) 739 p = hex_byte_pack(p, addr[5 - i]); 740 else 741 p = hex_byte_pack(p, addr[i]); 742 743 if (fmt[0] == 'M' && i != 5) 744 *p++ = separator; 745 } 746 *p = '\0'; 747 748 return string(buf, end, mac_addr, spec); 749 } 750 751 static noinline_for_stack 752 char *ip4_string(char *p, const u8 *addr, const char *fmt) 753 { 754 int i; 755 bool leading_zeros = (fmt[0] == 'i'); 756 int index; 757 int step; 758 759 switch (fmt[2]) { 760 case 'h': 761 #ifdef __BIG_ENDIAN 762 index = 0; 763 step = 1; 764 #else 765 index = 3; 766 step = -1; 767 #endif 768 break; 769 case 'l': 770 index = 3; 771 step = -1; 772 break; 773 case 'n': 774 case 'b': 775 default: 776 index = 0; 777 step = 1; 778 break; 779 } 780 for (i = 0; i < 4; i++) { 781 char temp[3]; /* hold each IP quad in reverse order */ 782 int digits = put_dec_trunc8(temp, addr[index]) - temp; 783 if (leading_zeros) { 784 if (digits < 3) 785 *p++ = '0'; 786 if (digits < 2) 787 *p++ = '0'; 788 } 789 /* reverse the digits in the quad */ 790 while (digits--) 791 *p++ = temp[digits]; 792 if (i < 3) 793 *p++ = '.'; 794 index += step; 795 } 796 *p = '\0'; 797 798 return p; 799 } 800 801 static noinline_for_stack 802 char *ip6_compressed_string(char *p, const char *addr) 803 { 804 int i, j, range; 805 unsigned char zerolength[8]; 806 int longest = 1; 807 int colonpos = -1; 808 u16 word; 809 u8 hi, lo; 810 bool needcolon = false; 811 bool useIPv4; 812 struct in6_addr in6; 813 814 memcpy(&in6, addr, sizeof(struct in6_addr)); 815 816 useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); 817 818 memset(zerolength, 0, sizeof(zerolength)); 819 820 if (useIPv4) 821 range = 6; 822 else 823 range = 8; 824 825 /* find position of longest 0 run */ 826 for (i = 0; i < range; i++) { 827 for (j = i; j < range; j++) { 828 if (in6.s6_addr16[j] != 0) 829 break; 830 zerolength[i]++; 831 } 832 } 833 for (i = 0; i < range; i++) { 834 if (zerolength[i] > longest) { 835 longest = zerolength[i]; 836 colonpos = i; 837 } 838 } 839 if (longest == 1) /* don't compress a single 0 */ 840 colonpos = -1; 841 842 /* emit address */ 843 for (i = 0; i < range; i++) { 844 if (i == colonpos) { 845 if (needcolon || i == 0) 846 *p++ = ':'; 847 *p++ = ':'; 848 needcolon = false; 849 i += longest - 1; 850 continue; 851 } 852 if (needcolon) { 853 *p++ = ':'; 854 needcolon = false; 855 } 856 /* hex u16 without leading 0s */ 857 word = ntohs(in6.s6_addr16[i]); 858 hi = word >> 8; 859 lo = word & 0xff; 860 if (hi) { 861 if (hi > 0x0f) 862 p = hex_byte_pack(p, hi); 863 else 864 *p++ = hex_asc_lo(hi); 865 p = hex_byte_pack(p, lo); 866 } 867 else if (lo > 0x0f) 868 p = hex_byte_pack(p, lo); 869 else 870 *p++ = hex_asc_lo(lo); 871 needcolon = true; 872 } 873 874 if (useIPv4) { 875 if (needcolon) 876 *p++ = ':'; 877 p = ip4_string(p, &in6.s6_addr[12], "I4"); 878 } 879 *p = '\0'; 880 881 return p; 882 } 883 884 static noinline_for_stack 885 char *ip6_string(char *p, const char *addr, const char *fmt) 886 { 887 int i; 888 889 for (i = 0; i < 8; i++) { 890 p = hex_byte_pack(p, *addr++); 891 p = hex_byte_pack(p, *addr++); 892 if (fmt[0] == 'I' && i != 7) 893 *p++ = ':'; 894 } 895 *p = '\0'; 896 897 return p; 898 } 899 900 static noinline_for_stack 901 char *ip6_addr_string(char *buf, char *end, const u8 *addr, 902 struct printf_spec spec, const char *fmt) 903 { 904 char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; 905 906 if (fmt[0] == 'I' && fmt[2] == 'c') 907 ip6_compressed_string(ip6_addr, addr); 908 else 909 ip6_string(ip6_addr, addr, fmt); 910 911 return string(buf, end, ip6_addr, spec); 912 } 913 914 static noinline_for_stack 915 char *ip4_addr_string(char *buf, char *end, const u8 *addr, 916 struct printf_spec spec, const char *fmt) 917 { 918 char ip4_addr[sizeof("255.255.255.255")]; 919 920 ip4_string(ip4_addr, addr, fmt); 921 922 return string(buf, end, ip4_addr, spec); 923 } 924 925 static noinline_for_stack 926 char *uuid_string(char *buf, char *end, const u8 *addr, 927 struct printf_spec spec, const char *fmt) 928 { 929 char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; 930 char *p = uuid; 931 int i; 932 static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; 933 static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; 934 const u8 *index = be; 935 bool uc = false; 936 937 switch (*(++fmt)) { 938 case 'L': 939 uc = true; /* fall-through */ 940 case 'l': 941 index = le; 942 break; 943 case 'B': 944 uc = true; 945 break; 946 } 947 948 for (i = 0; i < 16; i++) { 949 p = hex_byte_pack(p, addr[index[i]]); 950 switch (i) { 951 case 3: 952 case 5: 953 case 7: 954 case 9: 955 *p++ = '-'; 956 break; 957 } 958 } 959 960 *p = 0; 961 962 if (uc) { 963 p = uuid; 964 do { 965 *p = toupper(*p); 966 } while (*(++p)); 967 } 968 969 return string(buf, end, uuid, spec); 970 } 971 972 static 973 char *netdev_feature_string(char *buf, char *end, const u8 *addr, 974 struct printf_spec spec) 975 { 976 spec.flags |= SPECIAL | SMALL | ZEROPAD; 977 if (spec.field_width == -1) 978 spec.field_width = 2 + 2 * sizeof(netdev_features_t); 979 spec.base = 16; 980 981 return number(buf, end, *(const netdev_features_t *)addr, spec); 982 } 983 984 int kptr_restrict __read_mostly; 985 986 /* 987 * Show a '%p' thing. A kernel extension is that the '%p' is followed 988 * by an extra set of alphanumeric characters that are extended format 989 * specifiers. 990 * 991 * Right now we handle: 992 * 993 * - 'F' For symbolic function descriptor pointers with offset 994 * - 'f' For simple symbolic function names without offset 995 * - 'S' For symbolic direct pointers with offset 996 * - 's' For symbolic direct pointers without offset 997 * - '[FfSs]R' as above with __builtin_extract_return_addr() translation 998 * - 'B' For backtraced symbolic direct pointers with offset 999 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] 1000 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] 1001 * - 'M' For a 6-byte MAC address, it prints the address in the 1002 * usual colon-separated hex notation 1003 * - 'm' For a 6-byte MAC address, it prints the hex address without colons 1004 * - 'MF' For a 6-byte MAC FDDI address, it prints the address 1005 * with a dash-separated hex notation 1006 * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth) 1007 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way 1008 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) 1009 * IPv6 uses colon separated network-order 16 bit hex with leading 0's 1010 * - 'i' [46] for 'raw' IPv4/IPv6 addresses 1011 * IPv6 omits the colons (01020304...0f) 1012 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) 1013 * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order 1014 * - 'I6c' for IPv6 addresses printed as specified by 1015 * http://tools.ietf.org/html/rfc5952 1016 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form 1017 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" 1018 * Options for %pU are: 1019 * b big endian lower case hex (default) 1020 * B big endian UPPER case hex 1021 * l little endian lower case hex 1022 * L little endian UPPER case hex 1023 * big endian output byte order is: 1024 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] 1025 * little endian output byte order is: 1026 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] 1027 * - 'V' For a struct va_format which contains a format string * and va_list *, 1028 * call vsnprintf(->format, *->va_list). 1029 * Implements a "recursive vsnprintf". 1030 * Do not use this feature without some mechanism to verify the 1031 * correctness of the format string and va_list arguments. 1032 * - 'K' For a kernel pointer that should be hidden from unprivileged users 1033 * - 'NF' For a netdev_features_t 1034 * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with 1035 * a certain separator (' ' by default): 1036 * C colon 1037 * D dash 1038 * N no separator 1039 * The maximum supported length is 64 bytes of the input. Consider 1040 * to use print_hex_dump() for the larger input. 1041 * - 'a' For a phys_addr_t type and its derivative types (passed by reference) 1042 * 1043 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 1044 * function pointers are really function descriptors, which contain a 1045 * pointer to the real address. 1046 */ 1047 static noinline_for_stack 1048 char *pointer(const char *fmt, char *buf, char *end, void *ptr, 1049 struct printf_spec spec) 1050 { 1051 int default_width = 2 * sizeof(void *) + (spec.flags & SPECIAL ? 2 : 0); 1052 1053 if (!ptr && *fmt != 'K') { 1054 /* 1055 * Print (null) with the same width as a pointer so it makes 1056 * tabular output look nice. 1057 */ 1058 if (spec.field_width == -1) 1059 spec.field_width = default_width; 1060 return string(buf, end, "(null)", spec); 1061 } 1062 1063 switch (*fmt) { 1064 case 'F': 1065 case 'f': 1066 ptr = dereference_function_descriptor(ptr); 1067 /* Fallthrough */ 1068 case 'S': 1069 case 's': 1070 case 'B': 1071 return symbol_string(buf, end, ptr, spec, fmt); 1072 case 'R': 1073 case 'r': 1074 return resource_string(buf, end, ptr, spec, fmt); 1075 case 'h': 1076 return hex_string(buf, end, ptr, spec, fmt); 1077 case 'M': /* Colon separated: 00:01:02:03:04:05 */ 1078 case 'm': /* Contiguous: 000102030405 */ 1079 /* [mM]F (FDDI) */ 1080 /* [mM]R (Reverse order; Bluetooth) */ 1081 return mac_address_string(buf, end, ptr, spec, fmt); 1082 case 'I': /* Formatted IP supported 1083 * 4: 1.2.3.4 1084 * 6: 0001:0203:...:0708 1085 * 6c: 1::708 or 1::1.2.3.4 1086 */ 1087 case 'i': /* Contiguous: 1088 * 4: 001.002.003.004 1089 * 6: 000102...0f 1090 */ 1091 switch (fmt[1]) { 1092 case '6': 1093 return ip6_addr_string(buf, end, ptr, spec, fmt); 1094 case '4': 1095 return ip4_addr_string(buf, end, ptr, spec, fmt); 1096 } 1097 break; 1098 case 'U': 1099 return uuid_string(buf, end, ptr, spec, fmt); 1100 case 'V': 1101 { 1102 va_list va; 1103 1104 va_copy(va, *((struct va_format *)ptr)->va); 1105 buf += vsnprintf(buf, end > buf ? end - buf : 0, 1106 ((struct va_format *)ptr)->fmt, va); 1107 va_end(va); 1108 return buf; 1109 } 1110 case 'K': 1111 /* 1112 * %pK cannot be used in IRQ context because its test 1113 * for CAP_SYSLOG would be meaningless. 1114 */ 1115 if (kptr_restrict && (in_irq() || in_serving_softirq() || 1116 in_nmi())) { 1117 if (spec.field_width == -1) 1118 spec.field_width = default_width; 1119 return string(buf, end, "pK-error", spec); 1120 } 1121 if (!((kptr_restrict == 0) || 1122 (kptr_restrict == 1 && 1123 has_capability_noaudit(current, CAP_SYSLOG)))) 1124 ptr = NULL; 1125 break; 1126 case 'N': 1127 switch (fmt[1]) { 1128 case 'F': 1129 return netdev_feature_string(buf, end, ptr, spec); 1130 } 1131 break; 1132 case 'a': 1133 spec.flags |= SPECIAL | SMALL | ZEROPAD; 1134 spec.field_width = sizeof(phys_addr_t) * 2 + 2; 1135 spec.base = 16; 1136 return number(buf, end, 1137 (unsigned long long) *((phys_addr_t *)ptr), spec); 1138 } 1139 spec.flags |= SMALL; 1140 if (spec.field_width == -1) { 1141 spec.field_width = default_width; 1142 spec.flags |= ZEROPAD; 1143 } 1144 spec.base = 16; 1145 1146 return number(buf, end, (unsigned long) ptr, spec); 1147 } 1148 1149 /* 1150 * Helper function to decode printf style format. 1151 * Each call decode a token from the format and return the 1152 * number of characters read (or likely the delta where it wants 1153 * to go on the next call). 1154 * The decoded token is returned through the parameters 1155 * 1156 * 'h', 'l', or 'L' for integer fields 1157 * 'z' support added 23/7/1999 S.H. 1158 * 'z' changed to 'Z' --davidm 1/25/99 1159 * 't' added for ptrdiff_t 1160 * 1161 * @fmt: the format string 1162 * @type of the token returned 1163 * @flags: various flags such as +, -, # tokens.. 1164 * @field_width: overwritten width 1165 * @base: base of the number (octal, hex, ...) 1166 * @precision: precision of a number 1167 * @qualifier: qualifier of a number (long, size_t, ...) 1168 */ 1169 static noinline_for_stack 1170 int format_decode(const char *fmt, struct printf_spec *spec) 1171 { 1172 const char *start = fmt; 1173 1174 /* we finished early by reading the field width */ 1175 if (spec->type == FORMAT_TYPE_WIDTH) { 1176 if (spec->field_width < 0) { 1177 spec->field_width = -spec->field_width; 1178 spec->flags |= LEFT; 1179 } 1180 spec->type = FORMAT_TYPE_NONE; 1181 goto precision; 1182 } 1183 1184 /* we finished early by reading the precision */ 1185 if (spec->type == FORMAT_TYPE_PRECISION) { 1186 if (spec->precision < 0) 1187 spec->precision = 0; 1188 1189 spec->type = FORMAT_TYPE_NONE; 1190 goto qualifier; 1191 } 1192 1193 /* By default */ 1194 spec->type = FORMAT_TYPE_NONE; 1195 1196 for (; *fmt ; ++fmt) { 1197 if (*fmt == '%') 1198 break; 1199 } 1200 1201 /* Return the current non-format string */ 1202 if (fmt != start || !*fmt) 1203 return fmt - start; 1204 1205 /* Process flags */ 1206 spec->flags = 0; 1207 1208 while (1) { /* this also skips first '%' */ 1209 bool found = true; 1210 1211 ++fmt; 1212 1213 switch (*fmt) { 1214 case '-': spec->flags |= LEFT; break; 1215 case '+': spec->flags |= PLUS; break; 1216 case ' ': spec->flags |= SPACE; break; 1217 case '#': spec->flags |= SPECIAL; break; 1218 case '0': spec->flags |= ZEROPAD; break; 1219 default: found = false; 1220 } 1221 1222 if (!found) 1223 break; 1224 } 1225 1226 /* get field width */ 1227 spec->field_width = -1; 1228 1229 if (isdigit(*fmt)) 1230 spec->field_width = skip_atoi(&fmt); 1231 else if (*fmt == '*') { 1232 /* it's the next argument */ 1233 spec->type = FORMAT_TYPE_WIDTH; 1234 return ++fmt - start; 1235 } 1236 1237 precision: 1238 /* get the precision */ 1239 spec->precision = -1; 1240 if (*fmt == '.') { 1241 ++fmt; 1242 if (isdigit(*fmt)) { 1243 spec->precision = skip_atoi(&fmt); 1244 if (spec->precision < 0) 1245 spec->precision = 0; 1246 } else if (*fmt == '*') { 1247 /* it's the next argument */ 1248 spec->type = FORMAT_TYPE_PRECISION; 1249 return ++fmt - start; 1250 } 1251 } 1252 1253 qualifier: 1254 /* get the conversion qualifier */ 1255 spec->qualifier = -1; 1256 if (*fmt == 'h' || _tolower(*fmt) == 'l' || 1257 _tolower(*fmt) == 'z' || *fmt == 't') { 1258 spec->qualifier = *fmt++; 1259 if (unlikely(spec->qualifier == *fmt)) { 1260 if (spec->qualifier == 'l') { 1261 spec->qualifier = 'L'; 1262 ++fmt; 1263 } else if (spec->qualifier == 'h') { 1264 spec->qualifier = 'H'; 1265 ++fmt; 1266 } 1267 } 1268 } 1269 1270 /* default base */ 1271 spec->base = 10; 1272 switch (*fmt) { 1273 case 'c': 1274 spec->type = FORMAT_TYPE_CHAR; 1275 return ++fmt - start; 1276 1277 case 's': 1278 spec->type = FORMAT_TYPE_STR; 1279 return ++fmt - start; 1280 1281 case 'p': 1282 spec->type = FORMAT_TYPE_PTR; 1283 return fmt - start; 1284 /* skip alnum */ 1285 1286 case 'n': 1287 spec->type = FORMAT_TYPE_NRCHARS; 1288 return ++fmt - start; 1289 1290 case '%': 1291 spec->type = FORMAT_TYPE_PERCENT_CHAR; 1292 return ++fmt - start; 1293 1294 /* integer number formats - set up the flags and "break" */ 1295 case 'o': 1296 spec->base = 8; 1297 break; 1298 1299 case 'x': 1300 spec->flags |= SMALL; 1301 1302 case 'X': 1303 spec->base = 16; 1304 break; 1305 1306 case 'd': 1307 case 'i': 1308 spec->flags |= SIGN; 1309 case 'u': 1310 break; 1311 1312 default: 1313 spec->type = FORMAT_TYPE_INVALID; 1314 return fmt - start; 1315 } 1316 1317 if (spec->qualifier == 'L') 1318 spec->type = FORMAT_TYPE_LONG_LONG; 1319 else if (spec->qualifier == 'l') { 1320 if (spec->flags & SIGN) 1321 spec->type = FORMAT_TYPE_LONG; 1322 else 1323 spec->type = FORMAT_TYPE_ULONG; 1324 } else if (_tolower(spec->qualifier) == 'z') { 1325 spec->type = FORMAT_TYPE_SIZE_T; 1326 } else if (spec->qualifier == 't') { 1327 spec->type = FORMAT_TYPE_PTRDIFF; 1328 } else if (spec->qualifier == 'H') { 1329 if (spec->flags & SIGN) 1330 spec->type = FORMAT_TYPE_BYTE; 1331 else 1332 spec->type = FORMAT_TYPE_UBYTE; 1333 } else if (spec->qualifier == 'h') { 1334 if (spec->flags & SIGN) 1335 spec->type = FORMAT_TYPE_SHORT; 1336 else 1337 spec->type = FORMAT_TYPE_USHORT; 1338 } else { 1339 if (spec->flags & SIGN) 1340 spec->type = FORMAT_TYPE_INT; 1341 else 1342 spec->type = FORMAT_TYPE_UINT; 1343 } 1344 1345 return ++fmt - start; 1346 } 1347 1348 /** 1349 * vsnprintf - Format a string and place it in a buffer 1350 * @buf: The buffer to place the result into 1351 * @size: The size of the buffer, including the trailing null space 1352 * @fmt: The format string to use 1353 * @args: Arguments for the format string 1354 * 1355 * This function follows C99 vsnprintf, but has some extensions: 1356 * %pS output the name of a text symbol with offset 1357 * %ps output the name of a text symbol without offset 1358 * %pF output the name of a function pointer with its offset 1359 * %pf output the name of a function pointer without its offset 1360 * %pB output the name of a backtrace symbol with its offset 1361 * %pR output the address range in a struct resource with decoded flags 1362 * %pr output the address range in a struct resource with raw flags 1363 * %pM output a 6-byte MAC address with colons 1364 * %pMR output a 6-byte MAC address with colons in reversed order 1365 * %pMF output a 6-byte MAC address with dashes 1366 * %pm output a 6-byte MAC address without colons 1367 * %pmR output a 6-byte MAC address without colons in reversed order 1368 * %pI4 print an IPv4 address without leading zeros 1369 * %pi4 print an IPv4 address with leading zeros 1370 * %pI6 print an IPv6 address with colons 1371 * %pi6 print an IPv6 address without colons 1372 * %pI6c print an IPv6 address as specified by RFC 5952 1373 * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper 1374 * case. 1375 * %*ph[CDN] a variable-length hex string with a separator (supports up to 64 1376 * bytes of the input) 1377 * %n is ignored 1378 * 1379 * ** Please update Documentation/printk-formats.txt when making changes ** 1380 * 1381 * The return value is the number of characters which would 1382 * be generated for the given input, excluding the trailing 1383 * '\0', as per ISO C99. If you want to have the exact 1384 * number of characters written into @buf as return value 1385 * (not including the trailing '\0'), use vscnprintf(). If the 1386 * return is greater than or equal to @size, the resulting 1387 * string is truncated. 1388 * 1389 * If you're not already dealing with a va_list consider using snprintf(). 1390 */ 1391 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) 1392 { 1393 unsigned long long num; 1394 char *str, *end; 1395 struct printf_spec spec = {0}; 1396 1397 /* Reject out-of-range values early. Large positive sizes are 1398 used for unknown buffer sizes. */ 1399 if (WARN_ON_ONCE((int) size < 0)) 1400 return 0; 1401 1402 str = buf; 1403 end = buf + size; 1404 1405 /* Make sure end is always >= buf */ 1406 if (end < buf) { 1407 end = ((void *)-1); 1408 size = end - buf; 1409 } 1410 1411 while (*fmt) { 1412 const char *old_fmt = fmt; 1413 int read = format_decode(fmt, &spec); 1414 1415 fmt += read; 1416 1417 switch (spec.type) { 1418 case FORMAT_TYPE_NONE: { 1419 int copy = read; 1420 if (str < end) { 1421 if (copy > end - str) 1422 copy = end - str; 1423 memcpy(str, old_fmt, copy); 1424 } 1425 str += read; 1426 break; 1427 } 1428 1429 case FORMAT_TYPE_WIDTH: 1430 spec.field_width = va_arg(args, int); 1431 break; 1432 1433 case FORMAT_TYPE_PRECISION: 1434 spec.precision = va_arg(args, int); 1435 break; 1436 1437 case FORMAT_TYPE_CHAR: { 1438 char c; 1439 1440 if (!(spec.flags & LEFT)) { 1441 while (--spec.field_width > 0) { 1442 if (str < end) 1443 *str = ' '; 1444 ++str; 1445 1446 } 1447 } 1448 c = (unsigned char) va_arg(args, int); 1449 if (str < end) 1450 *str = c; 1451 ++str; 1452 while (--spec.field_width > 0) { 1453 if (str < end) 1454 *str = ' '; 1455 ++str; 1456 } 1457 break; 1458 } 1459 1460 case FORMAT_TYPE_STR: 1461 str = string(str, end, va_arg(args, char *), spec); 1462 break; 1463 1464 case FORMAT_TYPE_PTR: 1465 str = pointer(fmt+1, str, end, va_arg(args, void *), 1466 spec); 1467 while (isalnum(*fmt)) 1468 fmt++; 1469 break; 1470 1471 case FORMAT_TYPE_PERCENT_CHAR: 1472 if (str < end) 1473 *str = '%'; 1474 ++str; 1475 break; 1476 1477 case FORMAT_TYPE_INVALID: 1478 if (str < end) 1479 *str = '%'; 1480 ++str; 1481 break; 1482 1483 case FORMAT_TYPE_NRCHARS: { 1484 u8 qualifier = spec.qualifier; 1485 1486 if (qualifier == 'l') { 1487 long *ip = va_arg(args, long *); 1488 *ip = (str - buf); 1489 } else if (_tolower(qualifier) == 'z') { 1490 size_t *ip = va_arg(args, size_t *); 1491 *ip = (str - buf); 1492 } else { 1493 int *ip = va_arg(args, int *); 1494 *ip = (str - buf); 1495 } 1496 break; 1497 } 1498 1499 default: 1500 switch (spec.type) { 1501 case FORMAT_TYPE_LONG_LONG: 1502 num = va_arg(args, long long); 1503 break; 1504 case FORMAT_TYPE_ULONG: 1505 num = va_arg(args, unsigned long); 1506 break; 1507 case FORMAT_TYPE_LONG: 1508 num = va_arg(args, long); 1509 break; 1510 case FORMAT_TYPE_SIZE_T: 1511 if (spec.flags & SIGN) 1512 num = va_arg(args, ssize_t); 1513 else 1514 num = va_arg(args, size_t); 1515 break; 1516 case FORMAT_TYPE_PTRDIFF: 1517 num = va_arg(args, ptrdiff_t); 1518 break; 1519 case FORMAT_TYPE_UBYTE: 1520 num = (unsigned char) va_arg(args, int); 1521 break; 1522 case FORMAT_TYPE_BYTE: 1523 num = (signed char) va_arg(args, int); 1524 break; 1525 case FORMAT_TYPE_USHORT: 1526 num = (unsigned short) va_arg(args, int); 1527 break; 1528 case FORMAT_TYPE_SHORT: 1529 num = (short) va_arg(args, int); 1530 break; 1531 case FORMAT_TYPE_INT: 1532 num = (int) va_arg(args, int); 1533 break; 1534 default: 1535 num = va_arg(args, unsigned int); 1536 } 1537 1538 str = number(str, end, num, spec); 1539 } 1540 } 1541 1542 if (size > 0) { 1543 if (str < end) 1544 *str = '\0'; 1545 else 1546 end[-1] = '\0'; 1547 } 1548 1549 /* the trailing null byte doesn't count towards the total */ 1550 return str-buf; 1551 1552 } 1553 EXPORT_SYMBOL(vsnprintf); 1554 1555 /** 1556 * vscnprintf - Format a string and place it in a buffer 1557 * @buf: The buffer to place the result into 1558 * @size: The size of the buffer, including the trailing null space 1559 * @fmt: The format string to use 1560 * @args: Arguments for the format string 1561 * 1562 * The return value is the number of characters which have been written into 1563 * the @buf not including the trailing '\0'. If @size is == 0 the function 1564 * returns 0. 1565 * 1566 * If you're not already dealing with a va_list consider using scnprintf(). 1567 * 1568 * See the vsnprintf() documentation for format string extensions over C99. 1569 */ 1570 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) 1571 { 1572 int i; 1573 1574 i = vsnprintf(buf, size, fmt, args); 1575 1576 if (likely(i < size)) 1577 return i; 1578 if (size != 0) 1579 return size - 1; 1580 return 0; 1581 } 1582 EXPORT_SYMBOL(vscnprintf); 1583 1584 /** 1585 * snprintf - Format a string and place it in a buffer 1586 * @buf: The buffer to place the result into 1587 * @size: The size of the buffer, including the trailing null space 1588 * @fmt: The format string to use 1589 * @...: Arguments for the format string 1590 * 1591 * The return value is the number of characters which would be 1592 * generated for the given input, excluding the trailing null, 1593 * as per ISO C99. If the return is greater than or equal to 1594 * @size, the resulting string is truncated. 1595 * 1596 * See the vsnprintf() documentation for format string extensions over C99. 1597 */ 1598 int snprintf(char *buf, size_t size, const char *fmt, ...) 1599 { 1600 va_list args; 1601 int i; 1602 1603 va_start(args, fmt); 1604 i = vsnprintf(buf, size, fmt, args); 1605 va_end(args); 1606 1607 return i; 1608 } 1609 EXPORT_SYMBOL(snprintf); 1610 1611 /** 1612 * scnprintf - Format a string and place it in a buffer 1613 * @buf: The buffer to place the result into 1614 * @size: The size of the buffer, including the trailing null space 1615 * @fmt: The format string to use 1616 * @...: Arguments for the format string 1617 * 1618 * The return value is the number of characters written into @buf not including 1619 * the trailing '\0'. If @size is == 0 the function returns 0. 1620 */ 1621 1622 int scnprintf(char *buf, size_t size, const char *fmt, ...) 1623 { 1624 va_list args; 1625 int i; 1626 1627 va_start(args, fmt); 1628 i = vscnprintf(buf, size, fmt, args); 1629 va_end(args); 1630 1631 return i; 1632 } 1633 EXPORT_SYMBOL(scnprintf); 1634 1635 /** 1636 * vsprintf - Format a string and place it in a buffer 1637 * @buf: The buffer to place the result into 1638 * @fmt: The format string to use 1639 * @args: Arguments for the format string 1640 * 1641 * The function returns the number of characters written 1642 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid 1643 * buffer overflows. 1644 * 1645 * If you're not already dealing with a va_list consider using sprintf(). 1646 * 1647 * See the vsnprintf() documentation for format string extensions over C99. 1648 */ 1649 int vsprintf(char *buf, const char *fmt, va_list args) 1650 { 1651 return vsnprintf(buf, INT_MAX, fmt, args); 1652 } 1653 EXPORT_SYMBOL(vsprintf); 1654 1655 /** 1656 * sprintf - Format a string and place it in a buffer 1657 * @buf: The buffer to place the result into 1658 * @fmt: The format string to use 1659 * @...: Arguments for the format string 1660 * 1661 * The function returns the number of characters written 1662 * into @buf. Use snprintf() or scnprintf() in order to avoid 1663 * buffer overflows. 1664 * 1665 * See the vsnprintf() documentation for format string extensions over C99. 1666 */ 1667 int sprintf(char *buf, const char *fmt, ...) 1668 { 1669 va_list args; 1670 int i; 1671 1672 va_start(args, fmt); 1673 i = vsnprintf(buf, INT_MAX, fmt, args); 1674 va_end(args); 1675 1676 return i; 1677 } 1678 EXPORT_SYMBOL(sprintf); 1679 1680 #ifdef CONFIG_BINARY_PRINTF 1681 /* 1682 * bprintf service: 1683 * vbin_printf() - VA arguments to binary data 1684 * bstr_printf() - Binary data to text string 1685 */ 1686 1687 /** 1688 * vbin_printf - Parse a format string and place args' binary value in a buffer 1689 * @bin_buf: The buffer to place args' binary value 1690 * @size: The size of the buffer(by words(32bits), not characters) 1691 * @fmt: The format string to use 1692 * @args: Arguments for the format string 1693 * 1694 * The format follows C99 vsnprintf, except %n is ignored, and its argument 1695 * is skiped. 1696 * 1697 * The return value is the number of words(32bits) which would be generated for 1698 * the given input. 1699 * 1700 * NOTE: 1701 * If the return value is greater than @size, the resulting bin_buf is NOT 1702 * valid for bstr_printf(). 1703 */ 1704 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) 1705 { 1706 struct printf_spec spec = {0}; 1707 char *str, *end; 1708 1709 str = (char *)bin_buf; 1710 end = (char *)(bin_buf + size); 1711 1712 #define save_arg(type) \ 1713 do { \ 1714 if (sizeof(type) == 8) { \ 1715 unsigned long long value; \ 1716 str = PTR_ALIGN(str, sizeof(u32)); \ 1717 value = va_arg(args, unsigned long long); \ 1718 if (str + sizeof(type) <= end) { \ 1719 *(u32 *)str = *(u32 *)&value; \ 1720 *(u32 *)(str + 4) = *((u32 *)&value + 1); \ 1721 } \ 1722 } else { \ 1723 unsigned long value; \ 1724 str = PTR_ALIGN(str, sizeof(type)); \ 1725 value = va_arg(args, int); \ 1726 if (str + sizeof(type) <= end) \ 1727 *(typeof(type) *)str = (type)value; \ 1728 } \ 1729 str += sizeof(type); \ 1730 } while (0) 1731 1732 while (*fmt) { 1733 int read = format_decode(fmt, &spec); 1734 1735 fmt += read; 1736 1737 switch (spec.type) { 1738 case FORMAT_TYPE_NONE: 1739 case FORMAT_TYPE_INVALID: 1740 case FORMAT_TYPE_PERCENT_CHAR: 1741 break; 1742 1743 case FORMAT_TYPE_WIDTH: 1744 case FORMAT_TYPE_PRECISION: 1745 save_arg(int); 1746 break; 1747 1748 case FORMAT_TYPE_CHAR: 1749 save_arg(char); 1750 break; 1751 1752 case FORMAT_TYPE_STR: { 1753 const char *save_str = va_arg(args, char *); 1754 size_t len; 1755 1756 if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE 1757 || (unsigned long)save_str < PAGE_SIZE) 1758 save_str = "(null)"; 1759 len = strlen(save_str) + 1; 1760 if (str + len < end) 1761 memcpy(str, save_str, len); 1762 str += len; 1763 break; 1764 } 1765 1766 case FORMAT_TYPE_PTR: 1767 save_arg(void *); 1768 /* skip all alphanumeric pointer suffixes */ 1769 while (isalnum(*fmt)) 1770 fmt++; 1771 break; 1772 1773 case FORMAT_TYPE_NRCHARS: { 1774 /* skip %n 's argument */ 1775 u8 qualifier = spec.qualifier; 1776 void *skip_arg; 1777 if (qualifier == 'l') 1778 skip_arg = va_arg(args, long *); 1779 else if (_tolower(qualifier) == 'z') 1780 skip_arg = va_arg(args, size_t *); 1781 else 1782 skip_arg = va_arg(args, int *); 1783 break; 1784 } 1785 1786 default: 1787 switch (spec.type) { 1788 1789 case FORMAT_TYPE_LONG_LONG: 1790 save_arg(long long); 1791 break; 1792 case FORMAT_TYPE_ULONG: 1793 case FORMAT_TYPE_LONG: 1794 save_arg(unsigned long); 1795 break; 1796 case FORMAT_TYPE_SIZE_T: 1797 save_arg(size_t); 1798 break; 1799 case FORMAT_TYPE_PTRDIFF: 1800 save_arg(ptrdiff_t); 1801 break; 1802 case FORMAT_TYPE_UBYTE: 1803 case FORMAT_TYPE_BYTE: 1804 save_arg(char); 1805 break; 1806 case FORMAT_TYPE_USHORT: 1807 case FORMAT_TYPE_SHORT: 1808 save_arg(short); 1809 break; 1810 default: 1811 save_arg(int); 1812 } 1813 } 1814 } 1815 1816 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; 1817 #undef save_arg 1818 } 1819 EXPORT_SYMBOL_GPL(vbin_printf); 1820 1821 /** 1822 * bstr_printf - Format a string from binary arguments and place it in a buffer 1823 * @buf: The buffer to place the result into 1824 * @size: The size of the buffer, including the trailing null space 1825 * @fmt: The format string to use 1826 * @bin_buf: Binary arguments for the format string 1827 * 1828 * This function like C99 vsnprintf, but the difference is that vsnprintf gets 1829 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is 1830 * a binary buffer that generated by vbin_printf. 1831 * 1832 * The format follows C99 vsnprintf, but has some extensions: 1833 * see vsnprintf comment for details. 1834 * 1835 * The return value is the number of characters which would 1836 * be generated for the given input, excluding the trailing 1837 * '\0', as per ISO C99. If you want to have the exact 1838 * number of characters written into @buf as return value 1839 * (not including the trailing '\0'), use vscnprintf(). If the 1840 * return is greater than or equal to @size, the resulting 1841 * string is truncated. 1842 */ 1843 int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) 1844 { 1845 struct printf_spec spec = {0}; 1846 char *str, *end; 1847 const char *args = (const char *)bin_buf; 1848 1849 if (WARN_ON_ONCE((int) size < 0)) 1850 return 0; 1851 1852 str = buf; 1853 end = buf + size; 1854 1855 #define get_arg(type) \ 1856 ({ \ 1857 typeof(type) value; \ 1858 if (sizeof(type) == 8) { \ 1859 args = PTR_ALIGN(args, sizeof(u32)); \ 1860 *(u32 *)&value = *(u32 *)args; \ 1861 *((u32 *)&value + 1) = *(u32 *)(args + 4); \ 1862 } else { \ 1863 args = PTR_ALIGN(args, sizeof(type)); \ 1864 value = *(typeof(type) *)args; \ 1865 } \ 1866 args += sizeof(type); \ 1867 value; \ 1868 }) 1869 1870 /* Make sure end is always >= buf */ 1871 if (end < buf) { 1872 end = ((void *)-1); 1873 size = end - buf; 1874 } 1875 1876 while (*fmt) { 1877 const char *old_fmt = fmt; 1878 int read = format_decode(fmt, &spec); 1879 1880 fmt += read; 1881 1882 switch (spec.type) { 1883 case FORMAT_TYPE_NONE: { 1884 int copy = read; 1885 if (str < end) { 1886 if (copy > end - str) 1887 copy = end - str; 1888 memcpy(str, old_fmt, copy); 1889 } 1890 str += read; 1891 break; 1892 } 1893 1894 case FORMAT_TYPE_WIDTH: 1895 spec.field_width = get_arg(int); 1896 break; 1897 1898 case FORMAT_TYPE_PRECISION: 1899 spec.precision = get_arg(int); 1900 break; 1901 1902 case FORMAT_TYPE_CHAR: { 1903 char c; 1904 1905 if (!(spec.flags & LEFT)) { 1906 while (--spec.field_width > 0) { 1907 if (str < end) 1908 *str = ' '; 1909 ++str; 1910 } 1911 } 1912 c = (unsigned char) get_arg(char); 1913 if (str < end) 1914 *str = c; 1915 ++str; 1916 while (--spec.field_width > 0) { 1917 if (str < end) 1918 *str = ' '; 1919 ++str; 1920 } 1921 break; 1922 } 1923 1924 case FORMAT_TYPE_STR: { 1925 const char *str_arg = args; 1926 args += strlen(str_arg) + 1; 1927 str = string(str, end, (char *)str_arg, spec); 1928 break; 1929 } 1930 1931 case FORMAT_TYPE_PTR: 1932 str = pointer(fmt+1, str, end, get_arg(void *), spec); 1933 while (isalnum(*fmt)) 1934 fmt++; 1935 break; 1936 1937 case FORMAT_TYPE_PERCENT_CHAR: 1938 case FORMAT_TYPE_INVALID: 1939 if (str < end) 1940 *str = '%'; 1941 ++str; 1942 break; 1943 1944 case FORMAT_TYPE_NRCHARS: 1945 /* skip */ 1946 break; 1947 1948 default: { 1949 unsigned long long num; 1950 1951 switch (spec.type) { 1952 1953 case FORMAT_TYPE_LONG_LONG: 1954 num = get_arg(long long); 1955 break; 1956 case FORMAT_TYPE_ULONG: 1957 case FORMAT_TYPE_LONG: 1958 num = get_arg(unsigned long); 1959 break; 1960 case FORMAT_TYPE_SIZE_T: 1961 num = get_arg(size_t); 1962 break; 1963 case FORMAT_TYPE_PTRDIFF: 1964 num = get_arg(ptrdiff_t); 1965 break; 1966 case FORMAT_TYPE_UBYTE: 1967 num = get_arg(unsigned char); 1968 break; 1969 case FORMAT_TYPE_BYTE: 1970 num = get_arg(signed char); 1971 break; 1972 case FORMAT_TYPE_USHORT: 1973 num = get_arg(unsigned short); 1974 break; 1975 case FORMAT_TYPE_SHORT: 1976 num = get_arg(short); 1977 break; 1978 case FORMAT_TYPE_UINT: 1979 num = get_arg(unsigned int); 1980 break; 1981 default: 1982 num = get_arg(int); 1983 } 1984 1985 str = number(str, end, num, spec); 1986 } /* default: */ 1987 } /* switch(spec.type) */ 1988 } /* while(*fmt) */ 1989 1990 if (size > 0) { 1991 if (str < end) 1992 *str = '\0'; 1993 else 1994 end[-1] = '\0'; 1995 } 1996 1997 #undef get_arg 1998 1999 /* the trailing null byte doesn't count towards the total */ 2000 return str - buf; 2001 } 2002 EXPORT_SYMBOL_GPL(bstr_printf); 2003 2004 /** 2005 * bprintf - Parse a format string and place args' binary value in a buffer 2006 * @bin_buf: The buffer to place args' binary value 2007 * @size: The size of the buffer(by words(32bits), not characters) 2008 * @fmt: The format string to use 2009 * @...: Arguments for the format string 2010 * 2011 * The function returns the number of words(u32) written 2012 * into @bin_buf. 2013 */ 2014 int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) 2015 { 2016 va_list args; 2017 int ret; 2018 2019 va_start(args, fmt); 2020 ret = vbin_printf(bin_buf, size, fmt, args); 2021 va_end(args); 2022 2023 return ret; 2024 } 2025 EXPORT_SYMBOL_GPL(bprintf); 2026 2027 #endif /* CONFIG_BINARY_PRINTF */ 2028 2029 /** 2030 * vsscanf - Unformat a buffer into a list of arguments 2031 * @buf: input buffer 2032 * @fmt: format of buffer 2033 * @args: arguments 2034 */ 2035 int vsscanf(const char *buf, const char *fmt, va_list args) 2036 { 2037 const char *str = buf; 2038 char *next; 2039 char digit; 2040 int num = 0; 2041 u8 qualifier; 2042 unsigned int base; 2043 union { 2044 long long s; 2045 unsigned long long u; 2046 } val; 2047 s16 field_width; 2048 bool is_sign; 2049 2050 while (*fmt) { 2051 /* skip any white space in format */ 2052 /* white space in format matchs any amount of 2053 * white space, including none, in the input. 2054 */ 2055 if (isspace(*fmt)) { 2056 fmt = skip_spaces(++fmt); 2057 str = skip_spaces(str); 2058 } 2059 2060 /* anything that is not a conversion must match exactly */ 2061 if (*fmt != '%' && *fmt) { 2062 if (*fmt++ != *str++) 2063 break; 2064 continue; 2065 } 2066 2067 if (!*fmt) 2068 break; 2069 ++fmt; 2070 2071 /* skip this conversion. 2072 * advance both strings to next white space 2073 */ 2074 if (*fmt == '*') { 2075 if (!*str) 2076 break; 2077 while (!isspace(*fmt) && *fmt != '%' && *fmt) 2078 fmt++; 2079 while (!isspace(*str) && *str) 2080 str++; 2081 continue; 2082 } 2083 2084 /* get field width */ 2085 field_width = -1; 2086 if (isdigit(*fmt)) { 2087 field_width = skip_atoi(&fmt); 2088 if (field_width <= 0) 2089 break; 2090 } 2091 2092 /* get conversion qualifier */ 2093 qualifier = -1; 2094 if (*fmt == 'h' || _tolower(*fmt) == 'l' || 2095 _tolower(*fmt) == 'z') { 2096 qualifier = *fmt++; 2097 if (unlikely(qualifier == *fmt)) { 2098 if (qualifier == 'h') { 2099 qualifier = 'H'; 2100 fmt++; 2101 } else if (qualifier == 'l') { 2102 qualifier = 'L'; 2103 fmt++; 2104 } 2105 } 2106 } 2107 2108 if (!*fmt) 2109 break; 2110 2111 if (*fmt == 'n') { 2112 /* return number of characters read so far */ 2113 *va_arg(args, int *) = str - buf; 2114 ++fmt; 2115 continue; 2116 } 2117 2118 if (!*str) 2119 break; 2120 2121 base = 10; 2122 is_sign = 0; 2123 2124 switch (*fmt++) { 2125 case 'c': 2126 { 2127 char *s = (char *)va_arg(args, char*); 2128 if (field_width == -1) 2129 field_width = 1; 2130 do { 2131 *s++ = *str++; 2132 } while (--field_width > 0 && *str); 2133 num++; 2134 } 2135 continue; 2136 case 's': 2137 { 2138 char *s = (char *)va_arg(args, char *); 2139 if (field_width == -1) 2140 field_width = SHRT_MAX; 2141 /* first, skip leading white space in buffer */ 2142 str = skip_spaces(str); 2143 2144 /* now copy until next white space */ 2145 while (*str && !isspace(*str) && field_width--) 2146 *s++ = *str++; 2147 *s = '\0'; 2148 num++; 2149 } 2150 continue; 2151 case 'o': 2152 base = 8; 2153 break; 2154 case 'x': 2155 case 'X': 2156 base = 16; 2157 break; 2158 case 'i': 2159 base = 0; 2160 case 'd': 2161 is_sign = 1; 2162 case 'u': 2163 break; 2164 case '%': 2165 /* looking for '%' in str */ 2166 if (*str++ != '%') 2167 return num; 2168 continue; 2169 default: 2170 /* invalid format; stop here */ 2171 return num; 2172 } 2173 2174 /* have some sort of integer conversion. 2175 * first, skip white space in buffer. 2176 */ 2177 str = skip_spaces(str); 2178 2179 digit = *str; 2180 if (is_sign && digit == '-') 2181 digit = *(str + 1); 2182 2183 if (!digit 2184 || (base == 16 && !isxdigit(digit)) 2185 || (base == 10 && !isdigit(digit)) 2186 || (base == 8 && (!isdigit(digit) || digit > '7')) 2187 || (base == 0 && !isdigit(digit))) 2188 break; 2189 2190 if (is_sign) 2191 val.s = qualifier != 'L' ? 2192 simple_strtol(str, &next, base) : 2193 simple_strtoll(str, &next, base); 2194 else 2195 val.u = qualifier != 'L' ? 2196 simple_strtoul(str, &next, base) : 2197 simple_strtoull(str, &next, base); 2198 2199 if (field_width > 0 && next - str > field_width) { 2200 if (base == 0) 2201 _parse_integer_fixup_radix(str, &base); 2202 while (next - str > field_width) { 2203 if (is_sign) 2204 val.s = div_s64(val.s, base); 2205 else 2206 val.u = div_u64(val.u, base); 2207 --next; 2208 } 2209 } 2210 2211 switch (qualifier) { 2212 case 'H': /* that's 'hh' in format */ 2213 if (is_sign) 2214 *va_arg(args, signed char *) = val.s; 2215 else 2216 *va_arg(args, unsigned char *) = val.u; 2217 break; 2218 case 'h': 2219 if (is_sign) 2220 *va_arg(args, short *) = val.s; 2221 else 2222 *va_arg(args, unsigned short *) = val.u; 2223 break; 2224 case 'l': 2225 if (is_sign) 2226 *va_arg(args, long *) = val.s; 2227 else 2228 *va_arg(args, unsigned long *) = val.u; 2229 break; 2230 case 'L': 2231 if (is_sign) 2232 *va_arg(args, long long *) = val.s; 2233 else 2234 *va_arg(args, unsigned long long *) = val.u; 2235 break; 2236 case 'Z': 2237 case 'z': 2238 *va_arg(args, size_t *) = val.u; 2239 break; 2240 default: 2241 if (is_sign) 2242 *va_arg(args, int *) = val.s; 2243 else 2244 *va_arg(args, unsigned int *) = val.u; 2245 break; 2246 } 2247 num++; 2248 2249 if (!next) 2250 break; 2251 str = next; 2252 } 2253 2254 return num; 2255 } 2256 EXPORT_SYMBOL(vsscanf); 2257 2258 /** 2259 * sscanf - Unformat a buffer into a list of arguments 2260 * @buf: input buffer 2261 * @fmt: formatting of buffer 2262 * @...: resulting arguments 2263 */ 2264 int sscanf(const char *buf, const char *fmt, ...) 2265 { 2266 va_list args; 2267 int i; 2268 2269 va_start(args, fmt); 2270 i = vsscanf(buf, fmt, args); 2271 va_end(args); 2272 2273 return i; 2274 } 2275 EXPORT_SYMBOL(sscanf); 2276