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pointer to the end of the parsed string will be placed here 42 * @base: The number base to use 43 * 44 * This function is obsolete.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pointer to the end of the parsed string will be placed here 67 * @base: The number base to use 68 * 69 * This function is obsolete.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pointer to the end of the parsed string will be placed here 81 * @base: The number base to use 82 * 83 * This function is obsolete.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