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pointer to the end of the parsed string will be placed here 42 * @base: The number base to use 43 * 44 * This function is obsolete.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pointer to the end of the parsed string will be placed here 67 * @base: The number base to use 68 * 69 * This function is obsolete.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pointer to the end of the parsed string will be placed here 81 * @base: The number base to use 82 * 83 * This function is obsolete.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