lib/vsprintf.c

   1 /*
   2  *  linux/lib/vsprintf.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  */
   6
   7 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
   8 /*
   9  * Wirzenius wrote this portably, Torvalds fucked it up :-)
  10  */
  11
  12 /*
  13  * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com>
  14  * - changed to provide snprintf and vsnprintf functions
  15  * So Feb  1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de>
  16  * - scnprintf and vscnprintf
  17  */
  18
  19 #include <stdarg.h>
  20 #include <linux/module.h>
  21 #include <linux/types.h>
  22 #include <linux/string.h>
  23 #include <linux/ctype.h>
  24 #include <linux/kernel.h>
  25 #include <linux/kallsyms.h>
  26 #include <linux/uaccess.h>
  27 #include <linux/ioport.h>
  28 #include <net/addrconf.h>
  29
  30 #include <asm/page.h>           /* for PAGE_SIZE */
  31 #include <asm/div64.h>
  32 #include <asm/sections.h>       /* for dereference_function_descriptor() */
  33
  34 /* Works only for digits and letters, but small and fast */
  35 #define TOLOWER(x) ((x) | 0x20)
  36
  37 static unsigned int simple_guess_base(const char *cp)
  38 {
  39         if (cp[0] == '0') {
  40                 if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2]))
  41                         return 16;
  42                 else
  43                         return 8;
  44         } else {
  45                 return 10;
  46         }
  47 }
  48
  49 /**
  50  * simple_strtoull - convert a string to an unsigned long long
  51  * @cp: The start of the string
  52  * @endp: A pointer to the end of the parsed string will be placed here
  53  * @base: The number base to use
  54  */
  55 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
  56 {
  57         unsigned long long result = 0;
  58
  59         if (!base)
  60                 base = simple_guess_base(cp);
  61
  62         if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x')
  63                 cp += 2;
  64
  65         while (isxdigit(*cp)) {
  66                 unsigned int value;
  67
  68                 value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10;
  69                 if (value >= base)
  70                         break;
  71                 result = result * base + value;
  72                 cp++;
  73         }
  74         if (endp)
  75                 *endp = (char *)cp;
  76
  77         return result;
  78 }
  79 EXPORT_SYMBOL(simple_strtoull);
  80
  81 /**
  82  * simple_strtoul - convert a string to an unsigned long
  83  * @cp: The start of the string
  84  * @endp: A pointer to the end of the parsed string will be placed here
  85  * @base: The number base to use
  86  */
  87 unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
  88 {
  89         return simple_strtoull(cp, endp, base);
  90 }
  91 EXPORT_SYMBOL(simple_strtoul);
  92
  93 /**
  94  * simple_strtol - convert a string to a signed long
  95  * @cp: The start of the string
  96  * @endp: A pointer to the end of the parsed string will be placed here
  97  * @base: The number base to use
  98  */
  99 long simple_strtol(const char *cp, char **endp, unsigned int base)
 100 {
 101         if (*cp == '-')
 102                 return -simple_strtoul(cp + 1, endp, base);
 103
 104         return simple_strtoul(cp, endp, base);
 105 }
 106 EXPORT_SYMBOL(simple_strtol);
 107
 108 /**
 109  * simple_strtoll - convert a string to a signed long long
 110  * @cp: The start of the string
 111  * @endp: A pointer to the end of the parsed string will be placed here
 112  * @base: The number base to use
 113  */
 114 long long simple_strtoll(const char *cp, char **endp, unsigned int base)
 115 {
 116         if (*cp == '-')
 117                 return -simple_strtoull(cp + 1, endp, base);
 118
 119         return simple_strtoull(cp, endp, base);
 120 }
 121 EXPORT_SYMBOL(simple_strtoll);
 122
 123 /**
 124  * strict_strtoul - convert a string to an unsigned long strictly
 125  * @cp: The string to be converted
 126  * @base: The number base to use
 127  * @res: The converted result value
 128  *
 129  * strict_strtoul converts a string to an unsigned long only if the
 130  * string is really an unsigned long string, any string containing
 131  * any invalid char at the tail will be rejected and -EINVAL is returned,
 132  * only a newline char at the tail is acceptible because people generally
 133  * change a module parameter in the following way:
 134  *
 135  *      echo 1024 > /sys/module/e1000/parameters/copybreak
 136  *
 137  * echo will append a newline to the tail.
 138  *
 139  * It returns 0 if conversion is successful and *res is set to the converted
 140  * value, otherwise it returns -EINVAL and *res is set to 0.
 141  *
 142  * simple_strtoul just ignores the successive invalid characters and
 143  * return the converted value of prefix part of the string.
 144  */
 145 int strict_strtoul(const char *cp, unsigned int base, unsigned long *res)
 146 {
 147         char *tail;
 148         unsigned long val;
 149
 150         *res = 0;
 151         if (!*cp)
 152                 return -EINVAL;
 153
 154         val = simple_strtoul(cp, &tail, base);
 155         if (tail == cp)
 156                 return -EINVAL;
 157
 158         if ((tail[0] == '\0') || (tail[0] == '\n' && tail[1] == '\0')) {
 159                 *res = val;
 160                 return 0;
 161         }
 162
 163         return -EINVAL;
 164 }
 165 EXPORT_SYMBOL(strict_strtoul);
 166
 167 /**
 168  * strict_strtol - convert a string to a long strictly
 169  * @cp: The string to be converted
 170  * @base: The number base to use
 171  * @res: The converted result value
 172  *
 173  * strict_strtol is similiar to strict_strtoul, but it allows the first
 174  * character of a string is '-'.
 175  *
 176  * It returns 0 if conversion is successful and *res is set to the converted
 177  * value, otherwise it returns -EINVAL and *res is set to 0.
 178  */
 179 int strict_strtol(const char *cp, unsigned int base, long *res)
 180 {
 181         int ret;
 182         if (*cp == '-') {
 183                 ret = strict_strtoul(cp + 1, base, (unsigned long *)res);
 184                 if (!ret)
 185                         *res = -(*res);
 186         } else {
 187                 ret = strict_strtoul(cp, base, (unsigned long *)res);
 188         }
 189
 190         return ret;
 191 }
 192 EXPORT_SYMBOL(strict_strtol);
 193
 194 /**
 195  * strict_strtoull - convert a string to an unsigned long long strictly
 196  * @cp: The string to be converted
 197  * @base: The number base to use
 198  * @res: The converted result value
 199  *
 200  * strict_strtoull converts a string to an unsigned long long only if the
 201  * string is really an unsigned long long string, any string containing
 202  * any invalid char at the tail will be rejected and -EINVAL is returned,
 203  * only a newline char at the tail is acceptible because people generally
 204  * change a module parameter in the following way:
 205  *
 206  *      echo 1024 > /sys/module/e1000/parameters/copybreak
 207  *
 208  * echo will append a newline to the tail of the string.
 209  *
 210  * It returns 0 if conversion is successful and *res is set to the converted
 211  * value, otherwise it returns -EINVAL and *res is set to 0.
 212  *
 213  * simple_strtoull just ignores the successive invalid characters and
 214  * return the converted value of prefix part of the string.
 215  */
 216 int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res)
 217 {
 218         char *tail;
 219         unsigned long long val;
 220
 221         *res = 0;
 222         if (!*cp)
 223                 return -EINVAL;
 224
 225         val = simple_strtoull(cp, &tail, base);
 226         if (tail == cp)
 227                 return -EINVAL;
 228         if ((tail[0] == '\0') || (tail[0] == '\n' && tail[1] == '\0')) {
 229                 *res = val;
 230                 return 0;
 231         }
 232
 233         return -EINVAL;
 234 }
 235 EXPORT_SYMBOL(strict_strtoull);
 236
 237 /**
 238  * strict_strtoll - convert a string to a long long strictly
 239  * @cp: The string to be converted
 240  * @base: The number base to use
 241  * @res: The converted result value
 242  *
 243  * strict_strtoll is similiar to strict_strtoull, but it allows the first
 244  * character of a string is '-'.
 245  *
 246  * It returns 0 if conversion is successful and *res is set to the converted
 247  * value, otherwise it returns -EINVAL and *res is set to 0.
 248  */
 249 int strict_strtoll(const char *cp, unsigned int base, long long *res)
 250 {
 251         int ret;
 252         if (*cp == '-') {
 253                 ret = strict_strtoull(cp + 1, base, (unsigned long long *)res);
 254                 if (!ret)
 255                         *res = -(*res);
 256         } else {
 257                 ret = strict_strtoull(cp, base, (unsigned long long *)res);
 258         }
 259
 260         return ret;
 261 }
 262 EXPORT_SYMBOL(strict_strtoll);
 263
 264 static noinline_for_stack
 265 int skip_atoi(const char **s)
 266 {
 267         int i = 0;
 268
 269         while (isdigit(**s))
 270                 i = i*10 + *((*s)++) - '0';
 271
 272         return i;
 273 }
 274
 275 /* Decimal conversion is by far the most typical, and is used
 276  * for /proc and /sys data. This directly impacts e.g. top performance
 277  * with many processes running. We optimize it for speed
 278  * using code from
 279  * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
 280  * (with permission from the author, Douglas W. Jones). */
 281
 282 /* Formats correctly any integer in [0,99999].
 283  * Outputs from one to five digits depending on input.
 284  * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
 285 static noinline_for_stack
 286 char *put_dec_trunc(char *buf, unsigned q)
 287 {
 288         unsigned d3, d2, d1, d0;
 289         d1 = (q>>4) & 0xf;
 290         d2 = (q>>8) & 0xf;
 291         d3 = (q>>12);
 292
 293         d0 = 6*(d3 + d2 + d1) + (q & 0xf);
 294         q = (d0 * 0xcd) >> 11;
 295         d0 = d0 - 10*q;
 296         *buf++ = d0 + '0'; /* least significant digit */
 297         d1 = q + 9*d3 + 5*d2 + d1;
 298         if (d1 != 0) {
 299                 q = (d1 * 0xcd) >> 11;
 300                 d1 = d1 - 10*q;
 301                 *buf++ = d1 + '0'; /* next digit */
 302
 303                 d2 = q + 2*d2;
 304                 if ((d2 != 0) || (d3 != 0)) {
 305                         q = (d2 * 0xd) >> 7;
 306                         d2 = d2 - 10*q;
 307                         *buf++ = d2 + '0'; /* next digit */
 308
 309                         d3 = q + 4*d3;
 310                         if (d3 != 0) {
 311                                 q = (d3 * 0xcd) >> 11;
 312                                 d3 = d3 - 10*q;
 313                                 *buf++ = d3 + '0';  /* next digit */
 314                                 if (q != 0)
 315                                         *buf++ = q + '0'; /* most sign. digit */
 316                         }
 317                 }
 318         }
 319
 320         return buf;
 321 }
 322 /* Same with if's removed. Always emits five digits */
 323 static noinline_for_stack
 324 char *put_dec_full(char *buf, unsigned q)
 325 {
 326         /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
 327         /* but anyway, gcc produces better code with full-sized ints */
 328         unsigned d3, d2, d1, d0;
 329         d1 = (q>>4) & 0xf;
 330         d2 = (q>>8) & 0xf;
 331         d3 = (q>>12);
 332
 333         /*
 334          * Possible ways to approx. divide by 10
 335          * gcc -O2 replaces multiply with shifts and adds
 336          * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
 337          * (x * 0x67) >> 10:  1100111
 338          * (x * 0x34) >> 9:    110100 - same
 339          * (x * 0x1a) >> 8:     11010 - same
 340          * (x * 0x0d) >> 7:      1101 - same, shortest code (on i386)
 341          */
 342         d0 = 6*(d3 + d2 + d1) + (q & 0xf);
 343         q = (d0 * 0xcd) >> 11;
 344         d0 = d0 - 10*q;
 345         *buf++ = d0 + '0';
 346         d1 = q + 9*d3 + 5*d2 + d1;
 347                 q = (d1 * 0xcd) >> 11;
 348                 d1 = d1 - 10*q;
 349                 *buf++ = d1 + '0';
 350
 351                 d2 = q + 2*d2;
 352                         q = (d2 * 0xd) >> 7;
 353                         d2 = d2 - 10*q;
 354                         *buf++ = d2 + '0';
 355
 356                         d3 = q + 4*d3;
 357                                 q = (d3 * 0xcd) >> 11; /* - shorter code */
 358                                 /* q = (d3 * 0x67) >> 10; - would also work */
 359                                 d3 = d3 - 10*q;
 360                                 *buf++ = d3 + '0';
 361                                         *buf++ = q + '0';
 362
 363         return buf;
 364 }
 365 /* No inlining helps gcc to use registers better */
 366 static noinline_for_stack
 367 char *put_dec(char *buf, unsigned long long num)
 368 {
 369         while (1) {
 370                 unsigned rem;
 371                 if (num < 100000)
 372                         return put_dec_trunc(buf, num);
 373                 rem = do_div(num, 100000);
 374                 buf = put_dec_full(buf, rem);
 375         }
 376 }
 377
 378 #define ZEROPAD 1               /* pad with zero */
 379 #define SIGN    2               /* unsigned/signed long */
 380 #define PLUS    4               /* show plus */
 381 #define SPACE   8               /* space if plus */
 382 #define LEFT    16              /* left justified */
 383 #define SMALL   32              /* use lowercase in hex (must be 32 == 0x20) */
 384 #define SPECIAL 64              /* prefix hex with "0x", octal with "0" */
 385
 386 enum format_type {
 387         FORMAT_TYPE_NONE, /* Just a string part */
 388         FORMAT_TYPE_WIDTH,
 389         FORMAT_TYPE_PRECISION,
 390         FORMAT_TYPE_CHAR,
 391         FORMAT_TYPE_STR,
 392         FORMAT_TYPE_PTR,
 393         FORMAT_TYPE_PERCENT_CHAR,
 394         FORMAT_TYPE_INVALID,
 395         FORMAT_TYPE_LONG_LONG,
 396         FORMAT_TYPE_ULONG,
 397         FORMAT_TYPE_LONG,
 398         FORMAT_TYPE_UBYTE,
 399         FORMAT_TYPE_BYTE,
 400         FORMAT_TYPE_USHORT,
 401         FORMAT_TYPE_SHORT,
 402         FORMAT_TYPE_UINT,
 403         FORMAT_TYPE_INT,
 404         FORMAT_TYPE_NRCHARS,
 405         FORMAT_TYPE_SIZE_T,
 406         FORMAT_TYPE_PTRDIFF
 407 };
 408
 409 struct printf_spec {
 410         u8      type;           /* format_type enum */
 411         u8      flags;          /* flags to number() */
 412         u8      base;           /* number base, 8, 10 or 16 only */
 413         u8      qualifier;      /* number qualifier, one of 'hHlLtzZ' */
 414         s16     field_width;    /* width of output field */
 415         s16     precision;      /* # of digits/chars */
 416 };
 417
 418 static noinline_for_stack
 419 char *number(char *buf, char *end, unsigned long long num,
 420              struct printf_spec spec)
 421 {
 422         /* we are called with base 8, 10 or 16, only, thus don't need "G..."  */
 423         static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
 424
 425         char tmp[66];
 426         char sign;
 427         char locase;
 428         int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
 429         int i;
 430
 431         /* locase = 0 or 0x20. ORing digits or letters with 'locase'
 432          * produces same digits or (maybe lowercased) letters */
 433         locase = (spec.flags & SMALL);
 434         if (spec.flags & LEFT)
 435                 spec.flags &= ~ZEROPAD;
 436         sign = 0;
 437         if (spec.flags & SIGN) {
 438                 if ((signed long long)num < 0) {
 439                         sign = '-';
 440                         num = -(signed long long)num;
 441                         spec.field_width--;
 442                 } else if (spec.flags & PLUS) {
 443                         sign = '+';
 444                         spec.field_width--;
 445                 } else if (spec.flags & SPACE) {
 446                         sign = ' ';
 447                         spec.field_width--;
 448                 }
 449         }
 450         if (need_pfx) {
 451                 spec.field_width--;
 452                 if (spec.base == 16)
 453                         spec.field_width--;
 454         }
 455
 456         /* generate full string in tmp[], in reverse order */
 457         i = 0;
 458         if (num == 0)
 459                 tmp[i++] = '0';
 460         /* Generic code, for any base:
 461         else do {
 462                 tmp[i++] = (digits[do_div(num,base)] | locase);
 463         } while (num != 0);
 464         */
 465         else if (spec.base != 10) { /* 8 or 16 */
 466                 int mask = spec.base - 1;
 467                 int shift = 3;
 468
 469                 if (spec.base == 16)
 470                         shift = 4;
 471                 do {
 472                         tmp[i++] = (digits[((unsigned char)num) & mask] | locase);
 473                         num >>= shift;
 474                 } while (num);
 475         } else { /* base 10 */
 476                 i = put_dec(tmp, num) - tmp;
 477         }
 478
 479         /* printing 100 using %2d gives "100", not "00" */
 480         if (i > spec.precision)
 481                 spec.precision = i;
 482         /* leading space padding */
 483         spec.field_width -= spec.precision;
 484         if (!(spec.flags & (ZEROPAD+LEFT))) {
 485                 while (--spec.field_width >= 0) {
 486                         if (buf < end)
 487                                 *buf = ' ';
 488                         ++buf;
 489                 }
 490         }
 491         /* sign */
 492         if (sign) {
 493                 if (buf < end)
 494                         *buf = sign;
 495                 ++buf;
 496         }
 497         /* "0x" / "0" prefix */
 498         if (need_pfx) {
 499                 if (buf < end)
 500                         *buf = '0';
 501                 ++buf;
 502                 if (spec.base == 16) {
 503                         if (buf < end)
 504                                 *buf = ('X' | locase);
 505                         ++buf;
 506                 }
 507         }
 508         /* zero or space padding */
 509         if (!(spec.flags & LEFT)) {
 510                 char c = (spec.flags & ZEROPAD) ? '0' : ' ';
 511                 while (--spec.field_width >= 0) {
 512                         if (buf < end)
 513                                 *buf = c;
 514                         ++buf;
 515                 }
 516         }
 517         /* hmm even more zero padding? */
 518         while (i <= --spec.precision) {
 519                 if (buf < end)
 520                         *buf = '0';
 521                 ++buf;
 522         }
 523         /* actual digits of result */
 524         while (--i >= 0) {
 525                 if (buf < end)
 526                         *buf = tmp[i];
 527                 ++buf;
 528         }
 529         /* trailing space padding */
 530         while (--spec.field_width >= 0) {
 531                 if (buf < end)
 532                         *buf = ' ';
 533                 ++buf;
 534         }
 535
 536         return buf;
 537 }
 538
 539 static noinline_for_stack
 540 char *string(char *buf, char *end, const char *s, struct printf_spec spec)
 541 {
 542         int len, i;
 543
 544         if ((unsigned long)s < PAGE_SIZE)
 545                 s = "(null)";
 546
 547         len = strnlen(s, spec.precision);
 548
 549         if (!(spec.flags & LEFT)) {
 550                 while (len < spec.field_width--) {
 551                         if (buf < end)
 552                                 *buf = ' ';
 553                         ++buf;
 554                 }
 555         }
 556         for (i = 0; i < len; ++i) {
 557                 if (buf < end)
 558                         *buf = *s;
 559                 ++buf; ++s;
 560         }
 561         while (len < spec.field_width--) {
 562                 if (buf < end)
 563                         *buf = ' ';
 564                 ++buf;
 565         }
 566
 567         return buf;
 568 }
 569
 570 static noinline_for_stack
 571 char *symbol_string(char *buf, char *end, void *ptr,
 572                     struct printf_spec spec, char ext)
 573 {
 574         unsigned long value = (unsigned long) ptr;
 575 #ifdef CONFIG_KALLSYMS
 576         char sym[KSYM_SYMBOL_LEN];
 577         if (ext != 'f' && ext != 's')
 578                 sprint_symbol(sym, value);
 579         else
 580                 kallsyms_lookup(value, NULL, NULL, NULL, sym);
 581
 582         return string(buf, end, sym, spec);
 583 #else
 584         spec.field_width = 2 * sizeof(void *);
 585         spec.flags |= SPECIAL | SMALL | ZEROPAD;
 586         spec.base = 16;
 587
 588         return number(buf, end, value, spec);
 589 #endif
 590 }
 591
 592 static noinline_for_stack
 593 char *resource_string(char *buf, char *end, struct resource *res,
 594                       struct printf_spec spec, const char *fmt)
 595 {
 596 #ifndef IO_RSRC_PRINTK_SIZE
 597 #define IO_RSRC_PRINTK_SIZE     6
 598 #endif
 599
 600 #ifndef MEM_RSRC_PRINTK_SIZE
 601 #define MEM_RSRC_PRINTK_SIZE    10
 602 #endif
 603         static const struct printf_spec io_spec = {
 604                 .base = 16,
 605                 .field_width = IO_RSRC_PRINTK_SIZE,
 606                 .precision = -1,
 607                 .flags = SPECIAL | SMALL | ZEROPAD,
 608         };
 609         static const struct printf_spec mem_spec = {
 610                 .base = 16,
 611                 .field_width = MEM_RSRC_PRINTK_SIZE,
 612                 .precision = -1,
 613                 .flags = SPECIAL | SMALL | ZEROPAD,
 614         };
 615         static const struct printf_spec bus_spec = {
 616                 .base = 16,
 617                 .field_width = 2,
 618                 .precision = -1,
 619                 .flags = SMALL | ZEROPAD,
 620         };
 621         static const struct printf_spec dec_spec = {
 622                 .base = 10,
 623                 .precision = -1,
 624                 .flags = 0,
 625         };
 626         static const struct printf_spec str_spec = {
 627                 .field_width = -1,
 628                 .precision = 10,
 629                 .flags = LEFT,
 630         };
 631         static const struct printf_spec flag_spec = {
 632                 .base = 16,
 633                 .precision = -1,
 634                 .flags = SPECIAL | SMALL,
 635         };
 636
 637         /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
 638          * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
 639 #define RSRC_BUF_SIZE           ((2 * sizeof(resource_size_t)) + 4)
 640 #define FLAG_BUF_SIZE           (2 * sizeof(res->flags))
 641 #define DECODED_BUF_SIZE        sizeof("[mem - 64bit pref window disabled]")
 642 #define RAW_BUF_SIZE            sizeof("[mem - flags 0x]")
 643         char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
 644                      2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
 645
 646         char *p = sym, *pend = sym + sizeof(sym);
 647         int decode = (fmt[0] == 'R') ? 1 : 0;
 648         const struct printf_spec *specp;
 649
 650         *p++ = '[';
 651         if (res->flags & IORESOURCE_IO) {
 652                 p = string(p, pend, "io  ", str_spec);
 653                 specp = &io_spec;
 654         } else if (res->flags & IORESOURCE_MEM) {
 655                 p = string(p, pend, "mem ", str_spec);
 656                 specp = &mem_spec;
 657         } else if (res->flags & IORESOURCE_IRQ) {
 658                 p = string(p, pend, "irq ", str_spec);
 659                 specp = &dec_spec;
 660         } else if (res->flags & IORESOURCE_DMA) {
 661                 p = string(p, pend, "dma ", str_spec);
 662                 specp = &dec_spec;
 663         } else if (res->flags & IORESOURCE_BUS) {
 664                 p = string(p, pend, "bus ", str_spec);
 665                 specp = &bus_spec;
 666         } else {
 667                 p = string(p, pend, "??? ", str_spec);
 668                 specp = &mem_spec;
 669                 decode = 0;
 670         }
 671         p = number(p, pend, res->start, *specp);
 672         if (res->start != res->end) {
 673                 *p++ = '-';
 674                 p = number(p, pend, res->end, *specp);
 675         }
 676         if (decode) {
 677                 if (res->flags & IORESOURCE_MEM_64)
 678                         p = string(p, pend, " 64bit", str_spec);
 679                 if (res->flags & IORESOURCE_PREFETCH)
 680                         p = string(p, pend, " pref", str_spec);
 681                 if (res->flags & IORESOURCE_WINDOW)
 682                         p = string(p, pend, " window", str_spec);
 683                 if (res->flags & IORESOURCE_DISABLED)
 684                         p = string(p, pend, " disabled", str_spec);
 685         } else {
 686                 p = string(p, pend, " flags ", str_spec);
 687                 p = number(p, pend, res->flags, flag_spec);
 688         }
 689         *p++ = ']';
 690         *p = '\0';
 691
 692         return string(buf, end, sym, spec);
 693 }
 694
 695 static noinline_for_stack
 696 char *mac_address_string(char *buf, char *end, u8 *addr,
 697                          struct printf_spec spec, const char *fmt)
 698 {
 699         char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
 700         char *p = mac_addr;
 701         int i;
 702         char separator;
 703
 704         if (fmt[1] == 'F') {            /* FDDI canonical format */
 705                 separator = '-';
 706         } else {
 707                 separator = ':';
 708         }
 709
 710         for (i = 0; i < 6; i++) {
 711                 p = pack_hex_byte(p, addr[i]);
 712                 if (fmt[0] == 'M' && i != 5)
 713                         *p++ = separator;
 714         }
 715         *p = '\0';
 716
 717         return string(buf, end, mac_addr, spec);
 718 }
 719
 720 static noinline_for_stack
 721 char *ip4_string(char *p, const u8 *addr, const char *fmt)
 722 {
 723         int i;
 724         bool leading_zeros = (fmt[0] == 'i');
 725         int index;
 726         int step;
 727
 728         switch (fmt[2]) {
 729         case 'h':
 730 #ifdef __BIG_ENDIAN
 731                 index = 0;
 732                 step = 1;
 733 #else
 734                 index = 3;
 735                 step = -1;
 736 #endif
 737                 break;
 738         case 'l':
 739                 index = 3;
 740                 step = -1;
 741                 break;
 742         case 'n':
 743         case 'b':
 744         default:
 745                 index = 0;
 746                 step = 1;
 747                 break;
 748         }
 749         for (i = 0; i < 4; i++) {
 750                 char temp[3];   /* hold each IP quad in reverse order */
 751                 int digits = put_dec_trunc(temp, addr[index]) - temp;
 752                 if (leading_zeros) {
 753                         if (digits < 3)
 754                                 *p++ = '0';
 755                         if (digits < 2)
 756                                 *p++ = '0';
 757                 }
 758                 /* reverse the digits in the quad */
 759                 while (digits--)
 760                         *p++ = temp[digits];
 761                 if (i < 3)
 762                         *p++ = '.';
 763                 index += step;
 764         }
 765         *p = '\0';
 766
 767         return p;
 768 }
 769
 770 static noinline_for_stack
 771 char *ip6_compressed_string(char *p, const char *addr)
 772 {
 773         int i, j, range;
 774         unsigned char zerolength[8];
 775         int longest = 1;
 776         int colonpos = -1;
 777         u16 word;
 778         u8 hi, lo;
 779         bool needcolon = false;
 780         bool useIPv4;
 781         struct in6_addr in6;
 782
 783         memcpy(&in6, addr, sizeof(struct in6_addr));
 784
 785         useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
 786
 787         memset(zerolength, 0, sizeof(zerolength));
 788
 789         if (useIPv4)
 790                 range = 6;
 791         else
 792                 range = 8;
 793
 794         /* find position of longest 0 run */
 795         for (i = 0; i < range; i++) {
 796                 for (j = i; j < range; j++) {
 797                         if (in6.s6_addr16[j] != 0)
 798                                 break;
 799                         zerolength[i]++;
 800                 }
 801         }
 802         for (i = 0; i < range; i++) {
 803                 if (zerolength[i] > longest) {
 804                         longest = zerolength[i];
 805                         colonpos = i;
 806                 }
 807         }
 808
 809         /* emit address */
 810         for (i = 0; i < range; i++) {
 811                 if (i == colonpos) {
 812                         if (needcolon || i == 0)
 813                                 *p++ = ':';
 814                         *p++ = ':';
 815                         needcolon = false;
 816                         i += longest - 1;
 817                         continue;
 818                 }
 819                 if (needcolon) {
 820                         *p++ = ':';
 821                         needcolon = false;
 822                 }
 823                 /* hex u16 without leading 0s */
 824                 word = ntohs(in6.s6_addr16[i]);
 825                 hi = word >> 8;
 826                 lo = word & 0xff;
 827                 if (hi) {
 828                         if (hi > 0x0f)
 829                                 p = pack_hex_byte(p, hi);
 830                         else
 831                                 *p++ = hex_asc_lo(hi);
 832                         p = pack_hex_byte(p, lo);
 833                 }
 834                 else if (lo > 0x0f)
 835                         p = pack_hex_byte(p, lo);
 836                 else
 837                         *p++ = hex_asc_lo(lo);
 838                 needcolon = true;
 839         }
 840
 841         if (useIPv4) {
 842                 if (needcolon)
 843                         *p++ = ':';
 844                 p = ip4_string(p, &in6.s6_addr[12], "I4");
 845         }
 846         *p = '\0';
 847
 848         return p;
 849 }
 850
 851 static noinline_for_stack
 852 char *ip6_string(char *p, const char *addr, const char *fmt)
 853 {
 854         int i;
 855
 856         for (i = 0; i < 8; i++) {
 857                 p = pack_hex_byte(p, *addr++);
 858                 p = pack_hex_byte(p, *addr++);
 859                 if (fmt[0] == 'I' && i != 7)
 860                         *p++ = ':';
 861         }
 862         *p = '\0';
 863
 864         return p;
 865 }
 866
 867 static noinline_for_stack
 868 char *ip6_addr_string(char *buf, char *end, const u8 *addr,
 869                       struct printf_spec spec, const char *fmt)
 870 {
 871         char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
 872
 873         if (fmt[0] == 'I' && fmt[2] == 'c')
 874                 ip6_compressed_string(ip6_addr, addr);
 875         else
 876                 ip6_string(ip6_addr, addr, fmt);
 877
 878         return string(buf, end, ip6_addr, spec);
 879 }
 880
 881 static noinline_for_stack
 882 char *ip4_addr_string(char *buf, char *end, const u8 *addr,
 883                       struct printf_spec spec, const char *fmt)
 884 {
 885         char ip4_addr[sizeof("255.255.255.255")];
 886
 887         ip4_string(ip4_addr, addr, fmt);
 888
 889         return string(buf, end, ip4_addr, spec);
 890 }
 891
 892 static noinline_for_stack
 893 char *uuid_string(char *buf, char *end, const u8 *addr,
 894                   struct printf_spec spec, const char *fmt)
 895 {
 896         char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
 897         char *p = uuid;
 898         int i;
 899         static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
 900         static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
 901         const u8 *index = be;
 902         bool uc = false;
 903
 904         switch (*(++fmt)) {
 905         case 'L':
 906                 uc = true;              /* fall-through */
 907         case 'l':
 908                 index = le;
 909                 break;
 910         case 'B':
 911                 uc = true;
 912                 break;
 913         }
 914
 915         for (i = 0; i < 16; i++) {
 916                 p = pack_hex_byte(p, addr[index[i]]);
 917                 switch (i) {
 918                 case 3:
 919                 case 5:
 920                 case 7:
 921                 case 9:
 922                         *p++ = '-';
 923                         break;
 924                 }
 925         }
 926
 927         *p = 0;
 928
 929         if (uc) {
 930                 p = uuid;
 931                 do {
 932                         *p = toupper(*p);
 933                 } while (*(++p));
 934         }
 935
 936         return string(buf, end, uuid, spec);
 937 }
 938
 939 int kptr_restrict = 1;
 940
 941 /*
 942  * Show a '%p' thing.  A kernel extension is that the '%p' is followed
 943  * by an extra set of alphanumeric characters that are extended format
 944  * specifiers.
 945  *
 946  * Right now we handle:
 947  *
 948  * - 'F' For symbolic function descriptor pointers with offset
 949  * - 'f' For simple symbolic function names without offset
 950  * - 'S' For symbolic direct pointers with offset
 951  * - 's' For symbolic direct pointers without offset
 952  * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
 953  * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
 954  * - 'M' For a 6-byte MAC address, it prints the address in the
 955  *       usual colon-separated hex notation
 956  * - 'm' For a 6-byte MAC address, it prints the hex address without colons
 957  * - 'MF' For a 6-byte MAC FDDI address, it prints the address
 958  *       with a dash-separated hex notation
 959  * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
 960  *       IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
 961  *       IPv6 uses colon separated network-order 16 bit hex with leading 0's
 962  * - 'i' [46] for 'raw' IPv4/IPv6 addresses
 963  *       IPv6 omits the colons (01020304...0f)
 964  *       IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
 965  * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order
 966  * - 'I6c' for IPv6 addresses printed as specified by
 967  *       http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00
 968  * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
 969  *       "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
 970  *       Options for %pU are:
 971  *         b big endian lower case hex (default)
 972  *         B big endian UPPER case hex
 973  *         l little endian lower case hex
 974  *         L little endian UPPER case hex
 975  *           big endian output byte order is:
 976  *             [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
 977  *           little endian output byte order is:
 978  *             [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
 979  * - 'V' For a struct va_format which contains a format string * and va_list *,
 980  *       call vsnprintf(->format, *->va_list).
 981  *       Implements a "recursive vsnprintf".
 982  *       Do not use this feature without some mechanism to verify the
 983  *       correctness of the format string and va_list arguments.
 984  * - 'K' For a kernel pointer that should be hidden from unprivileged users
 985  *
 986  * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
 987  * function pointers are really function descriptors, which contain a
 988  * pointer to the real address.
 989  */
 990 static noinline_for_stack
 991 char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 992               struct printf_spec spec)
 993 {
 994         if (!ptr && *fmt != 'K') {
 995                 /*
 996                  * Print (null) with the same width as a pointer so it makes
 997                  * tabular output look nice.
 998                  */
 999                 if (spec.field_width == -1)
1000                         spec.field_width = 2 * sizeof(void *);
1001                 return string(buf, end, "(null)", spec);
1002         }
1003
1004         switch (*fmt) {
1005         case 'F':
1006         case 'f':
1007                 ptr = dereference_function_descriptor(ptr);
1008                 /* Fallthrough */
1009         case 'S':
1010         case 's':
1011                 return symbol_string(buf, end, ptr, spec, *fmt);
1012         case 'R':
1013         case 'r':
1014                 return resource_string(buf, end, ptr, spec, fmt);
1015         case 'M':                       /* Colon separated: 00:01:02:03:04:05 */
1016         case 'm':                       /* Contiguous: 000102030405 */
1017                                         /* [mM]F (FDDI, bit reversed) */
1018                 return mac_address_string(buf, end, ptr, spec, fmt);
1019         case 'I':                       /* Formatted IP supported
1020                                          * 4:   1.2.3.4
1021                                          * 6:   0001:0203:...:0708
1022                                          * 6c:  1::708 or 1::1.2.3.4
1023                                          */
1024         case 'i':                       /* Contiguous:
1025                                          * 4:   001.002.003.004
1026                                          * 6:   000102...0f
1027                                          */
1028                 switch (fmt[1]) {
1029                 case '6':
1030                         return ip6_addr_string(buf, end, ptr, spec, fmt);
1031                 case '4':
1032                         return ip4_addr_string(buf, end, ptr, spec, fmt);
1033                 }
1034                 break;
1035         case 'U':
1036                 return uuid_string(buf, end, ptr, spec, fmt);
1037         case 'V':
1038                 return buf + vsnprintf(buf, end - buf,
1039                                        ((struct va_format *)ptr)->fmt,
1040                                        *(((struct va_format *)ptr)->va));
1041         case 'K':
1042                 /*
1043                  * %pK cannot be used in IRQ context because its test
1044                  * for CAP_SYSLOG would be meaningless.
1045                  */
1046                 if (in_irq() || in_serving_softirq() || in_nmi()) {
1047                         if (spec.field_width == -1)
1048                                 spec.field_width = 2 * sizeof(void *);
1049                         return string(buf, end, "pK-error", spec);
1050                 }
1051                 if (!((kptr_restrict == 0) ||
1052                       (kptr_restrict == 1 &&
1053                        has_capability_noaudit(current, CAP_SYSLOG))))
1054                         ptr = NULL;
1055                 break;
1056         }
1057         spec.flags |= SMALL;
1058         if (spec.field_width == -1) {
1059                 spec.field_width = 2 * sizeof(void *);
1060                 spec.flags |= ZEROPAD;
1061         }
1062         spec.base = 16;
1063
1064         return number(buf, end, (unsigned long) ptr, spec);
1065 }
1066
1067 /*
1068  * Helper function to decode printf style format.
1069  * Each call decode a token from the format and return the
1070  * number of characters read (or likely the delta where it wants
1071  * to go on the next call).
1072  * The decoded token is returned through the parameters
1073  *
1074  * 'h', 'l', or 'L' for integer fields
1075  * 'z' support added 23/7/1999 S.H.
1076  * 'z' changed to 'Z' --davidm 1/25/99
1077  * 't' added for ptrdiff_t
1078  *
1079  * @fmt: the format string
1080  * @type of the token returned
1081  * @flags: various flags such as +, -, # tokens..
1082  * @field_width: overwritten width
1083  * @base: base of the number (octal, hex, ...)
1084  * @precision: precision of a number
1085  * @qualifier: qualifier of a number (long, size_t, ...)
1086  */
1087 static noinline_for_stack
1088 int format_decode(const char *fmt, struct printf_spec *spec)
1089 {
1090         const char *start = fmt;
1091
1092         /* we finished early by reading the field width */
1093         if (spec->type == FORMAT_TYPE_WIDTH) {
1094                 if (spec->field_width < 0) {
1095                         spec->field_width = -spec->field_width;
1096                         spec->flags |= LEFT;
1097                 }
1098                 spec->type = FORMAT_TYPE_NONE;
1099                 goto precision;
1100         }
1101
1102         /* we finished early by reading the precision */
1103         if (spec->type == FORMAT_TYPE_PRECISION) {
1104                 if (spec->precision < 0)
1105                         spec->precision = 0;
1106
1107                 spec->type = FORMAT_TYPE_NONE;
1108                 goto qualifier;
1109         }
1110
1111         /* By default */
1112         spec->type = FORMAT_TYPE_NONE;
1113
1114         for (; *fmt ; ++fmt) {
1115                 if (*fmt == '%')
1116                         break;
1117         }
1118
1119         /* Return the current non-format string */
1120         if (fmt != start || !*fmt)
1121                 return fmt - start;
1122
1123         /* Process flags */
1124         spec->flags = 0;
1125
1126         while (1) { /* this also skips first '%' */
1127                 bool found = true;
1128
1129                 ++fmt;
1130
1131                 switch (*fmt) {
1132                 case '-': spec->flags |= LEFT;    break;
1133                 case '+': spec->flags |= PLUS;    break;
1134                 case ' ': spec->flags |= SPACE;   break;
1135                 case '#': spec->flags |= SPECIAL; break;
1136                 case '0': spec->flags |= ZEROPAD; break;
1137                 default:  found = false;
1138                 }
1139
1140                 if (!found)
1141                         break;
1142         }
1143
1144         /* get field width */
1145         spec->field_width = -1;
1146
1147         if (isdigit(*fmt))
1148                 spec->field_width = skip_atoi(&fmt);
1149         else if (*fmt == '*') {
1150                 /* it's the next argument */
1151                 spec->type = FORMAT_TYPE_WIDTH;
1152                 return ++fmt - start;
1153         }
1154
1155 precision:
1156         /* get the precision */
1157         spec->precision = -1;
1158         if (*fmt == '.') {
1159                 ++fmt;
1160                 if (isdigit(*fmt)) {
1161                         spec->precision = skip_atoi(&fmt);
1162                         if (spec->precision < 0)
1163                                 spec->precision = 0;
1164                 } else if (*fmt == '*') {
1165                         /* it's the next argument */
1166                         spec->type = FORMAT_TYPE_PRECISION;
1167                         return ++fmt - start;
1168                 }
1169         }
1170
1171 qualifier:
1172         /* get the conversion qualifier */
1173         spec->qualifier = -1;
1174         if (*fmt == 'h' || TOLOWER(*fmt) == 'l' ||
1175             TOLOWER(*fmt) == 'z' || *fmt == 't') {
1176                 spec->qualifier = *fmt++;
1177                 if (unlikely(spec->qualifier == *fmt)) {
1178                         if (spec->qualifier == 'l') {
1179                                 spec->qualifier = 'L';
1180                                 ++fmt;
1181                         } else if (spec->qualifier == 'h') {
1182                                 spec->qualifier = 'H';
1183                                 ++fmt;
1184                         }
1185                 }
1186         }
1187
1188         /* default base */
1189         spec->base = 10;
1190         switch (*fmt) {
1191         case 'c':
1192                 spec->type = FORMAT_TYPE_CHAR;
1193                 return ++fmt - start;
1194
1195         case 's':
1196                 spec->type = FORMAT_TYPE_STR;
1197                 return ++fmt - start;
1198
1199         case 'p':
1200                 spec->type = FORMAT_TYPE_PTR;
1201                 return fmt - start;
1202                 /* skip alnum */
1203
1204         case 'n':
1205                 spec->type = FORMAT_TYPE_NRCHARS;
1206                 return ++fmt - start;
1207
1208         case '%':
1209                 spec->type = FORMAT_TYPE_PERCENT_CHAR;
1210                 return ++fmt - start;
1211
1212         /* integer number formats - set up the flags and "break" */
1213         case 'o':
1214                 spec->base = 8;
1215                 break;
1216
1217         case 'x':
1218                 spec->flags |= SMALL;
1219
1220         case 'X':
1221                 spec->base = 16;
1222                 break;
1223
1224         case 'd':
1225         case 'i':
1226                 spec->flags |= SIGN;
1227         case 'u':
1228                 break;
1229
1230         default:
1231                 spec->type = FORMAT_TYPE_INVALID;
1232                 return fmt - start;
1233         }
1234
1235         if (spec->qualifier == 'L')
1236                 spec->type = FORMAT_TYPE_LONG_LONG;
1237         else if (spec->qualifier == 'l') {
1238                 if (spec->flags & SIGN)
1239                         spec->type = FORMAT_TYPE_LONG;
1240                 else
1241                         spec->type = FORMAT_TYPE_ULONG;
1242         } else if (TOLOWER(spec->qualifier) == 'z') {
1243                 spec->type = FORMAT_TYPE_SIZE_T;
1244         } else if (spec->qualifier == 't') {
1245                 spec->type = FORMAT_TYPE_PTRDIFF;
1246         } else if (spec->qualifier == 'H') {
1247                 if (spec->flags & SIGN)
1248                         spec->type = FORMAT_TYPE_BYTE;
1249                 else
1250                         spec->type = FORMAT_TYPE_UBYTE;
1251         } else if (spec->qualifier == 'h') {
1252                 if (spec->flags & SIGN)
1253                         spec->type = FORMAT_TYPE_SHORT;
1254                 else
1255                         spec->type = FORMAT_TYPE_USHORT;
1256         } else {
1257                 if (spec->flags & SIGN)
1258                         spec->type = FORMAT_TYPE_INT;
1259                 else
1260                         spec->type = FORMAT_TYPE_UINT;
1261         }
1262
1263         return ++fmt - start;
1264 }
1265
1266 /**
1267  * vsnprintf - Format a string and place it in a buffer
1268  * @buf: The buffer to place the result into
1269  * @size: The size of the buffer, including the trailing null space
1270  * @fmt: The format string to use
1271  * @args: Arguments for the format string
1272  *
1273  * This function follows C99 vsnprintf, but has some extensions:
1274  * %pS output the name of a text symbol with offset
1275  * %ps output the name of a text symbol without offset
1276  * %pF output the name of a function pointer with its offset
1277  * %pf output the name of a function pointer without its offset
1278  * %pR output the address range in a struct resource with decoded flags
1279  * %pr output the address range in a struct resource with raw flags
1280  * %pM output a 6-byte MAC address with colons
1281  * %pm output a 6-byte MAC address without colons
1282  * %pI4 print an IPv4 address without leading zeros
1283  * %pi4 print an IPv4 address with leading zeros
1284  * %pI6 print an IPv6 address with colons
1285  * %pi6 print an IPv6 address without colons
1286  * %pI6c print an IPv6 address as specified by
1287  *   http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00
1288  * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
1289  *   case.
1290  * %n is ignored
1291  *
1292  * The return value is the number of characters which would
1293  * be generated for the given input, excluding the trailing
1294  * '\0', as per ISO C99. If you want to have the exact
1295  * number of characters written into @buf as return value
1296  * (not including the trailing '\0'), use vscnprintf(). If the
1297  * return is greater than or equal to @size, the resulting
1298  * string is truncated.
1299  *
1300  * Call this function if you are already dealing with a va_list.
1301  * You probably want snprintf() instead.
1302  */
1303 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
1304 {
1305         unsigned long long num;
1306         char *str, *end;
1307         struct printf_spec spec = {0};
1308
1309         /* Reject out-of-range values early.  Large positive sizes are
1310            used for unknown buffer sizes. */
1311         if (WARN_ON_ONCE((int) size < 0))
1312                 return 0;
1313
1314         str = buf;
1315         end = buf + size;
1316
1317         /* Make sure end is always >= buf */
1318         if (end < buf) {
1319                 end = ((void *)-1);
1320                 size = end - buf;
1321         }
1322
1323         while (*fmt) {
1324                 const char *old_fmt = fmt;
1325                 int read = format_decode(fmt, &spec);
1326
1327                 fmt += read;
1328
1329                 switch (spec.type) {
1330                 case FORMAT_TYPE_NONE: {
1331                         int copy = read;
1332                         if (str < end) {
1333                                 if (copy > end - str)
1334                                         copy = end - str;
1335                                 memcpy(str, old_fmt, copy);
1336                         }
1337                         str += read;
1338                         break;
1339                 }
1340
1341                 case FORMAT_TYPE_WIDTH:
1342                         spec.field_width = va_arg(args, int);
1343                         break;
1344
1345                 case FORMAT_TYPE_PRECISION:
1346                         spec.precision = va_arg(args, int);
1347                         break;
1348
1349                 case FORMAT_TYPE_CHAR: {
1350                         char c;
1351
1352                         if (!(spec.flags & LEFT)) {
1353                                 while (--spec.field_width > 0) {
1354                                         if (str < end)
1355                                                 *str = ' ';
1356                                         ++str;
1357
1358                                 }
1359                         }
1360                         c = (unsigned char) va_arg(args, int);
1361                         if (str < end)
1362                                 *str = c;
1363                         ++str;
1364                         while (--spec.field_width > 0) {
1365                                 if (str < end)
1366                                         *str = ' ';
1367                                 ++str;
1368                         }
1369                         break;
1370                 }
1371
1372                 case FORMAT_TYPE_STR:
1373                         str = string(str, end, va_arg(args, char *), spec);
1374                         break;
1375
1376                 case FORMAT_TYPE_PTR:
1377                         str = pointer(fmt+1, str, end, va_arg(args, void *),
1378                                       spec);
1379                         while (isalnum(*fmt))
1380                                 fmt++;
1381                         break;
1382
1383                 case FORMAT_TYPE_PERCENT_CHAR:
1384                         if (str < end)
1385                                 *str = '%';
1386                         ++str;
1387                         break;
1388
1389                 case FORMAT_TYPE_INVALID:
1390                         if (str < end)
1391                                 *str = '%';
1392                         ++str;
1393                         break;
1394
1395                 case FORMAT_TYPE_NRCHARS: {
1396                         u8 qualifier = spec.qualifier;
1397
1398                         if (qualifier == 'l') {
1399                                 long *ip = va_arg(args, long *);
1400                                 *ip = (str - buf);
1401                         } else if (TOLOWER(qualifier) == 'z') {
1402                                 size_t *ip = va_arg(args, size_t *);
1403                                 *ip = (str - buf);
1404                         } else {
1405                                 int *ip = va_arg(args, int *);
1406                                 *ip = (str - buf);
1407                         }
1408                         break;
1409                 }
1410
1411                 default:
1412                         switch (spec.type) {
1413                         case FORMAT_TYPE_LONG_LONG:
1414                                 num = va_arg(args, long long);
1415                                 break;
1416                         case FORMAT_TYPE_ULONG:
1417                                 num = va_arg(args, unsigned long);
1418                                 break;
1419                         case FORMAT_TYPE_LONG:
1420                                 num = va_arg(args, long);
1421                                 break;
1422                         case FORMAT_TYPE_SIZE_T:
1423                                 num = va_arg(args, size_t);
1424                                 break;
1425                         case FORMAT_TYPE_PTRDIFF:
1426                                 num = va_arg(args, ptrdiff_t);
1427                                 break;
1428                         case FORMAT_TYPE_UBYTE:
1429                                 num = (unsigned char) va_arg(args, int);
1430                                 break;
1431                         case FORMAT_TYPE_BYTE:
1432                                 num = (signed char) va_arg(args, int);
1433                                 break;
1434                         case FORMAT_TYPE_USHORT:
1435                                 num = (unsigned short) va_arg(args, int);
1436                                 break;
1437                         case FORMAT_TYPE_SHORT:
1438                                 num = (short) va_arg(args, int);
1439                                 break;
1440                         case FORMAT_TYPE_INT:
1441                                 num = (int) va_arg(args, int);
1442                                 break;
1443                         default:
1444                                 num = va_arg(args, unsigned int);
1445                         }
1446
1447                         str = number(str, end, num, spec);
1448                 }
1449         }
1450
1451         if (size > 0) {
1452                 if (str < end)
1453                         *str = '\0';
1454                 else
1455                         end[-1] = '\0';
1456         }
1457
1458         /* the trailing null byte doesn't count towards the total */
1459         return str-buf;
1460
1461 }
1462 EXPORT_SYMBOL(vsnprintf);
1463
1464 /**
1465  * vscnprintf - Format a string and place it in a buffer
1466  * @buf: The buffer to place the result into
1467  * @size: The size of the buffer, including the trailing null space
1468  * @fmt: The format string to use
1469  * @args: Arguments for the format string
1470  *
1471  * The return value is the number of characters which have been written into
1472  * the @buf not including the trailing '\0'. If @size is == 0 the function
1473  * returns 0.
1474  *
1475  * Call this function if you are already dealing with a va_list.
1476  * You probably want scnprintf() instead.
1477  *
1478  * See the vsnprintf() documentation for format string extensions over C99.
1479  */
1480 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
1481 {
1482         int i;
1483
1484         i = vsnprintf(buf, size, fmt, args);
1485
1486         if (likely(i < size))
1487                 return i;
1488         if (size != 0)
1489                 return size - 1;
1490         return 0;
1491 }
1492 EXPORT_SYMBOL(vscnprintf);
1493
1494 /**
1495  * snprintf - Format a string and place it in a buffer
1496  * @buf: The buffer to place the result into
1497  * @size: The size of the buffer, including the trailing null space
1498  * @fmt: The format string to use
1499  * @...: Arguments for the format string
1500  *
1501  * The return value is the number of characters which would be
1502  * generated for the given input, excluding the trailing null,
1503  * as per ISO C99.  If the return is greater than or equal to
1504  * @size, the resulting string is truncated.
1505  *
1506  * See the vsnprintf() documentation for format string extensions over C99.
1507  */
1508 int snprintf(char *buf, size_t size, const char *fmt, ...)
1509 {
1510         va_list args;
1511         int i;
1512
1513         va_start(args, fmt);
1514         i = vsnprintf(buf, size, fmt, args);
1515         va_end(args);
1516
1517         return i;
1518 }
1519 EXPORT_SYMBOL(snprintf);
1520
1521 /**
1522  * scnprintf - Format a string and place it in a buffer
1523  * @buf: The buffer to place the result into
1524  * @size: The size of the buffer, including the trailing null space
1525  * @fmt: The format string to use
1526  * @...: Arguments for the format string
1527  *
1528  * The return value is the number of characters written into @buf not including
1529  * the trailing '\0'. If @size is == 0 the function returns 0.
1530  */
1531
1532 int scnprintf(char *buf, size_t size, const char *fmt, ...)
1533 {
1534         va_list args;
1535         int i;
1536
1537         va_start(args, fmt);
1538         i = vscnprintf(buf, size, fmt, args);
1539         va_end(args);
1540
1541         return i;
1542 }
1543 EXPORT_SYMBOL(scnprintf);
1544
1545 /**
1546  * vsprintf - Format a string and place it in a buffer
1547  * @buf: The buffer to place the result into
1548  * @fmt: The format string to use
1549  * @args: Arguments for the format string
1550  *
1551  * The function returns the number of characters written
1552  * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
1553  * buffer overflows.
1554  *
1555  * Call this function if you are already dealing with a va_list.
1556  * You probably want sprintf() instead.
1557  *
1558  * See the vsnprintf() documentation for format string extensions over C99.
1559  */
1560 int vsprintf(char *buf, const char *fmt, va_list args)
1561 {
1562         return vsnprintf(buf, INT_MAX, fmt, args);
1563 }
1564 EXPORT_SYMBOL(vsprintf);
1565
1566 /**
1567  * sprintf - Format a string and place it in a buffer
1568  * @buf: The buffer to place the result into
1569  * @fmt: The format string to use
1570  * @...: Arguments for the format string
1571  *
1572  * The function returns the number of characters written
1573  * into @buf. Use snprintf() or scnprintf() in order to avoid
1574  * buffer overflows.
1575  *
1576  * See the vsnprintf() documentation for format string extensions over C99.
1577  */
1578 int sprintf(char *buf, const char *fmt, ...)
1579 {
1580         va_list args;
1581         int i;
1582
1583         va_start(args, fmt);
1584         i = vsnprintf(buf, INT_MAX, fmt, args);
1585         va_end(args);
1586
1587         return i;
1588 }
1589 EXPORT_SYMBOL(sprintf);
1590
1591 #ifdef CONFIG_BINARY_PRINTF
1592 /*
1593  * bprintf service:
1594  * vbin_printf() - VA arguments to binary data
1595  * bstr_printf() - Binary data to text string
1596  */
1597
1598 /**
1599  * vbin_printf - Parse a format string and place args' binary value in a buffer
1600  * @bin_buf: The buffer to place args' binary value
1601  * @size: The size of the buffer(by words(32bits), not characters)
1602  * @fmt: The format string to use
1603  * @args: Arguments for the format string
1604  *
1605  * The format follows C99 vsnprintf, except %n is ignored, and its argument
1606  * is skiped.
1607  *
1608  * The return value is the number of words(32bits) which would be generated for
1609  * the given input.
1610  *
1611  * NOTE:
1612  * If the return value is greater than @size, the resulting bin_buf is NOT
1613  * valid for bstr_printf().
1614  */
1615 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
1616 {
1617         struct printf_spec spec = {0};
1618         char *str, *end;
1619
1620         str = (char *)bin_buf;
1621         end = (char *)(bin_buf + size);
1622
1623 #define save_arg(type)                                                  \
1624 do {                                                                    \
1625         if (sizeof(type) == 8) {                                        \
1626                 unsigned long long value;                               \
1627                 str = PTR_ALIGN(str, sizeof(u32));                      \
1628                 value = va_arg(args, unsigned long long);               \
1629                 if (str + sizeof(type) <= end) {                        \
1630                         *(u32 *)str = *(u32 *)&value;                   \
1631                         *(u32 *)(str + 4) = *((u32 *)&value + 1);       \
1632                 }                                                       \
1633         } else {                                                        \
1634                 unsigned long value;                                    \
1635                 str = PTR_ALIGN(str, sizeof(type));                     \
1636                 value = va_arg(args, int);                              \
1637                 if (str + sizeof(type) <= end)                          \
1638                         *(typeof(type) *)str = (type)value;             \
1639         }                                                               \
1640         str += sizeof(type);                                            \
1641 } while (0)
1642
1643         while (*fmt) {
1644                 int read = format_decode(fmt, &spec);
1645
1646                 fmt += read;
1647
1648                 switch (spec.type) {
1649                 case FORMAT_TYPE_NONE:
1650                 case FORMAT_TYPE_INVALID:
1651                 case FORMAT_TYPE_PERCENT_CHAR:
1652                         break;
1653
1654                 case FORMAT_TYPE_WIDTH:
1655                 case FORMAT_TYPE_PRECISION:
1656                         save_arg(int);
1657                         break;
1658
1659                 case FORMAT_TYPE_CHAR:
1660                         save_arg(char);
1661                         break;
1662
1663                 case FORMAT_TYPE_STR: {
1664                         const char *save_str = va_arg(args, char *);
1665                         size_t len;
1666
1667                         if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
1668                                         || (unsigned long)save_str < PAGE_SIZE)
1669                                 save_str = "(null)";
1670                         len = strlen(save_str) + 1;
1671                         if (str + len < end)
1672                                 memcpy(str, save_str, len);
1673                         str += len;
1674                         break;
1675                 }
1676
1677                 case FORMAT_TYPE_PTR:
1678                         save_arg(void *);
1679                         /* skip all alphanumeric pointer suffixes */
1680                         while (isalnum(*fmt))
1681                                 fmt++;
1682                         break;
1683
1684                 case FORMAT_TYPE_NRCHARS: {
1685                         /* skip %n 's argument */
1686                         u8 qualifier = spec.qualifier;
1687                         void *skip_arg;
1688                         if (qualifier == 'l')
1689                                 skip_arg = va_arg(args, long *);
1690                         else if (TOLOWER(qualifier) == 'z')
1691                                 skip_arg = va_arg(args, size_t *);
1692                         else
1693                                 skip_arg = va_arg(args, int *);
1694                         break;
1695                 }
1696
1697                 default:
1698                         switch (spec.type) {
1699
1700                         case FORMAT_TYPE_LONG_LONG:
1701                                 save_arg(long long);
1702                                 break;
1703                         case FORMAT_TYPE_ULONG:
1704                         case FORMAT_TYPE_LONG:
1705                                 save_arg(unsigned long);
1706                                 break;
1707                         case FORMAT_TYPE_SIZE_T:
1708                                 save_arg(size_t);
1709                                 break;
1710                         case FORMAT_TYPE_PTRDIFF:
1711                                 save_arg(ptrdiff_t);
1712                                 break;
1713                         case FORMAT_TYPE_UBYTE:
1714                         case FORMAT_TYPE_BYTE:
1715                                 save_arg(char);
1716                                 break;
1717                         case FORMAT_TYPE_USHORT:
1718                         case FORMAT_TYPE_SHORT:
1719                                 save_arg(short);
1720                                 break;
1721                         default:
1722                                 save_arg(int);
1723                         }
1724                 }
1725         }
1726
1727         return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
1728 #undef save_arg
1729 }
1730 EXPORT_SYMBOL_GPL(vbin_printf);
1731
1732 /**
1733  * bstr_printf - Format a string from binary arguments and place it in a buffer
1734  * @buf: The buffer to place the result into
1735  * @size: The size of the buffer, including the trailing null space
1736  * @fmt: The format string to use
1737  * @bin_buf: Binary arguments for the format string
1738  *
1739  * This function like C99 vsnprintf, but the difference is that vsnprintf gets
1740  * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
1741  * a binary buffer that generated by vbin_printf.
1742  *
1743  * The format follows C99 vsnprintf, but has some extensions:
1744  *  see vsnprintf comment for details.
1745  *
1746  * The return value is the number of characters which would
1747  * be generated for the given input, excluding the trailing
1748  * '\0', as per ISO C99. If you want to have the exact
1749  * number of characters written into @buf as return value
1750  * (not including the trailing '\0'), use vscnprintf(). If the
1751  * return is greater than or equal to @size, the resulting
1752  * string is truncated.
1753  */
1754 int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
1755 {
1756         struct printf_spec spec = {0};
1757         char *str, *end;
1758         const char *args = (const char *)bin_buf;
1759
1760         if (WARN_ON_ONCE((int) size < 0))
1761                 return 0;
1762
1763         str = buf;
1764         end = buf + size;
1765
1766 #define get_arg(type)                                                   \
1767 ({                                                                      \
1768         typeof(type) value;                                             \
1769         if (sizeof(type) == 8) {                                        \
1770                 args = PTR_ALIGN(args, sizeof(u32));                    \
1771                 *(u32 *)&value = *(u32 *)args;                          \
1772                 *((u32 *)&value + 1) = *(u32 *)(args + 4);              \
1773         } else {                                                        \
1774                 args = PTR_ALIGN(args, sizeof(type));                   \
1775                 value = *(typeof(type) *)args;                          \
1776         }                                                               \
1777         args += sizeof(type);                                           \
1778         value;                                                          \
1779 })
1780
1781         /* Make sure end is always >= buf */
1782         if (end < buf) {
1783                 end = ((void *)-1);
1784                 size = end - buf;
1785         }
1786
1787         while (*fmt) {
1788                 const char *old_fmt = fmt;
1789                 int read = format_decode(fmt, &spec);
1790
1791                 fmt += read;
1792
1793                 switch (spec.type) {
1794                 case FORMAT_TYPE_NONE: {
1795                         int copy = read;
1796                         if (str < end) {
1797                                 if (copy > end - str)
1798                                         copy = end - str;
1799                                 memcpy(str, old_fmt, copy);
1800                         }
1801                         str += read;
1802                         break;
1803                 }
1804
1805                 case FORMAT_TYPE_WIDTH:
1806                         spec.field_width = get_arg(int);
1807                         break;
1808
1809                 case FORMAT_TYPE_PRECISION:
1810                         spec.precision = get_arg(int);
1811                         break;
1812
1813                 case FORMAT_TYPE_CHAR: {
1814                         char c;
1815
1816                         if (!(spec.flags & LEFT)) {
1817                                 while (--spec.field_width > 0) {
1818                                         if (str < end)
1819                                                 *str = ' ';
1820                                         ++str;
1821                                 }
1822                         }
1823                         c = (unsigned char) get_arg(char);
1824                         if (str < end)
1825                                 *str = c;
1826                         ++str;
1827                         while (--spec.field_width > 0) {
1828                                 if (str < end)
1829                                         *str = ' ';
1830                                 ++str;
1831                         }
1832                         break;
1833                 }
1834
1835                 case FORMAT_TYPE_STR: {
1836                         const char *str_arg = args;
1837                         args += strlen(str_arg) + 1;
1838                         str = string(str, end, (char *)str_arg, spec);
1839                         break;
1840                 }
1841
1842                 case FORMAT_TYPE_PTR:
1843                         str = pointer(fmt+1, str, end, get_arg(void *), spec);
1844                         while (isalnum(*fmt))
1845                                 fmt++;
1846                         break;
1847
1848                 case FORMAT_TYPE_PERCENT_CHAR:
1849                 case FORMAT_TYPE_INVALID:
1850                         if (str < end)
1851                                 *str = '%';
1852                         ++str;
1853                         break;
1854
1855                 case FORMAT_TYPE_NRCHARS:
1856                         /* skip */
1857                         break;
1858
1859                 default: {
1860                         unsigned long long num;
1861
1862                         switch (spec.type) {
1863
1864                         case FORMAT_TYPE_LONG_LONG:
1865                                 num = get_arg(long long);
1866                                 break;
1867                         case FORMAT_TYPE_ULONG:
1868                         case FORMAT_TYPE_LONG:
1869                                 num = get_arg(unsigned long);
1870                                 break;
1871                         case FORMAT_TYPE_SIZE_T:
1872                                 num = get_arg(size_t);
1873                                 break;
1874                         case FORMAT_TYPE_PTRDIFF:
1875                                 num = get_arg(ptrdiff_t);
1876                                 break;
1877                         case FORMAT_TYPE_UBYTE:
1878                                 num = get_arg(unsigned char);
1879                                 break;
1880                         case FORMAT_TYPE_BYTE:
1881                                 num = get_arg(signed char);
1882                                 break;
1883                         case FORMAT_TYPE_USHORT:
1884                                 num = get_arg(unsigned short);
1885                                 break;
1886                         case FORMAT_TYPE_SHORT:
1887                                 num = get_arg(short);
1888                                 break;
1889                         case FORMAT_TYPE_UINT:
1890                                 num = get_arg(unsigned int);
1891                                 break;
1892                         default:
1893                                 num = get_arg(int);
1894                         }
1895
1896                         str = number(str, end, num, spec);
1897                 } /* default: */
1898                 } /* switch(spec.type) */
1899         } /* while(*fmt) */
1900
1901         if (size > 0) {
1902                 if (str < end)
1903                         *str = '\0';
1904                 else
1905                         end[-1] = '\0';
1906         }
1907
1908 #undef get_arg
1909
1910         /* the trailing null byte doesn't count towards the total */
1911         return str - buf;
1912 }
1913 EXPORT_SYMBOL_GPL(bstr_printf);
1914
1915 /**
1916  * bprintf - Parse a format string and place args' binary value in a buffer
1917  * @bin_buf: The buffer to place args' binary value
1918  * @size: The size of the buffer(by words(32bits), not characters)
1919  * @fmt: The format string to use
1920  * @...: Arguments for the format string
1921  *
1922  * The function returns the number of words(u32) written
1923  * into @bin_buf.
1924  */
1925 int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
1926 {
1927         va_list args;
1928         int ret;
1929
1930         va_start(args, fmt);
1931         ret = vbin_printf(bin_buf, size, fmt, args);
1932         va_end(args);
1933
1934         return ret;
1935 }
1936 EXPORT_SYMBOL_GPL(bprintf);
1937
1938 #endif /* CONFIG_BINARY_PRINTF */
1939
1940 /**
1941  * vsscanf - Unformat a buffer into a list of arguments
1942  * @buf:        input buffer
1943  * @fmt:        format of buffer
1944  * @args:       arguments
1945  */
1946 int vsscanf(const char *buf, const char *fmt, va_list args)
1947 {
1948         const char *str = buf;
1949         char *next;
1950         char digit;
1951         int num = 0;
1952         u8 qualifier;
1953         u8 base;
1954         s16 field_width;
1955         bool is_sign;
1956
1957         while (*fmt && *str) {
1958                 /* skip any white space in format */
1959                 /* white space in format matchs any amount of
1960                  * white space, including none, in the input.
1961                  */
1962                 if (isspace(*fmt)) {
1963                         fmt = skip_spaces(++fmt);
1964                         str = skip_spaces(str);
1965                 }
1966
1967                 /* anything that is not a conversion must match exactly */
1968                 if (*fmt != '%' && *fmt) {
1969                         if (*fmt++ != *str++)
1970                                 break;
1971                         continue;
1972                 }
1973
1974                 if (!*fmt)
1975                         break;
1976                 ++fmt;
1977
1978                 /* skip this conversion.
1979                  * advance both strings to next white space
1980                  */
1981                 if (*fmt == '*') {
1982                         while (!isspace(*fmt) && *fmt != '%' && *fmt)
1983                                 fmt++;
1984                         while (!isspace(*str) && *str)
1985                                 str++;
1986                         continue;
1987                 }
1988
1989                 /* get field width */
1990                 field_width = -1;
1991                 if (isdigit(*fmt))
1992                         field_width = skip_atoi(&fmt);
1993
1994                 /* get conversion qualifier */
1995                 qualifier = -1;
1996                 if (*fmt == 'h' || TOLOWER(*fmt) == 'l' ||
1997                     TOLOWER(*fmt) == 'z') {
1998                         qualifier = *fmt++;
1999                         if (unlikely(qualifier == *fmt)) {
2000                                 if (qualifier == 'h') {
2001                                         qualifier = 'H';
2002                                         fmt++;
2003                                 } else if (qualifier == 'l') {
2004                                         qualifier = 'L';
2005                                         fmt++;
2006                                 }
2007                         }
2008                 }
2009
2010                 if (!*fmt || !*str)
2011                         break;
2012
2013                 base = 10;
2014                 is_sign = 0;
2015
2016                 switch (*fmt++) {
2017                 case 'c':
2018                 {
2019                         char *s = (char *)va_arg(args, char*);
2020                         if (field_width == -1)
2021                                 field_width = 1;
2022                         do {
2023                                 *s++ = *str++;
2024                         } while (--field_width > 0 && *str);
2025                         num++;
2026                 }
2027                 continue;
2028                 case 's':
2029                 {
2030                         char *s = (char *)va_arg(args, char *);
2031                         if (field_width == -1)
2032                                 field_width = SHRT_MAX;
2033                         /* first, skip leading white space in buffer */
2034                         str = skip_spaces(str);
2035
2036                         /* now copy until next white space */
2037                         while (*str && !isspace(*str) && field_width--)
2038                                 *s++ = *str++;
2039                         *s = '\0';
2040                         num++;
2041                 }
2042                 continue;
2043                 case 'n':
2044                         /* return number of characters read so far */
2045                 {
2046                         int *i = (int *)va_arg(args, int*);
2047                         *i = str - buf;
2048                 }
2049                 continue;
2050                 case 'o':
2051                         base = 8;
2052                         break;
2053                 case 'x':
2054                 case 'X':
2055                         base = 16;
2056                         break;
2057                 case 'i':
2058                         base = 0;
2059                 case 'd':
2060                         is_sign = 1;
2061                 case 'u':
2062                         break;
2063                 case '%':
2064                         /* looking for '%' in str */
2065                         if (*str++ != '%')
2066                                 return num;
2067                         continue;
2068                 default:
2069                         /* invalid format; stop here */
2070                         return num;
2071                 }
2072
2073                 /* have some sort of integer conversion.
2074                  * first, skip white space in buffer.
2075                  */
2076                 str = skip_spaces(str);
2077
2078                 digit = *str;
2079                 if (is_sign && digit == '-')
2080                         digit = *(str + 1);
2081
2082                 if (!digit
2083                     || (base == 16 && !isxdigit(digit))
2084                     || (base == 10 && !isdigit(digit))
2085                     || (base == 8 && (!isdigit(digit) || digit > '7'))
2086                     || (base == 0 && !isdigit(digit)))
2087                         break;
2088
2089                 switch (qualifier) {
2090                 case 'H':       /* that's 'hh' in format */
2091                         if (is_sign) {
2092                                 signed char *s = (signed char *)va_arg(args, signed char *);
2093                                 *s = (signed char)simple_strtol(str, &next, base);
2094                         } else {
2095                                 unsigned char *s = (unsigned char *)va_arg(args, unsigned char *);
2096                                 *s = (unsigned char)simple_strtoul(str, &next, base);
2097                         }
2098                         break;
2099                 case 'h':
2100                         if (is_sign) {
2101                                 short *s = (short *)va_arg(args, short *);
2102                                 *s = (short)simple_strtol(str, &next, base);
2103                         } else {
2104                                 unsigned short *s = (unsigned short *)va_arg(args, unsigned short *);
2105                                 *s = (unsigned short)simple_strtoul(str, &next, base);
2106                         }
2107                         break;
2108                 case 'l':
2109                         if (is_sign) {
2110                                 long *l = (long *)va_arg(args, long *);
2111                                 *l = simple_strtol(str, &next, base);
2112                         } else {
2113                                 unsigned long *l = (unsigned long *)va_arg(args, unsigned long *);
2114                                 *l = simple_strtoul(str, &next, base);
2115                         }
2116                         break;
2117                 case 'L':
2118                         if (is_sign) {
2119                                 long long *l = (long long *)va_arg(args, long long *);
2120                                 *l = simple_strtoll(str, &next, base);
2121                         } else {
2122                                 unsigned long long *l = (unsigned long long *)va_arg(args, unsigned long long *);
2123                                 *l = simple_strtoull(str, &next, base);
2124                         }
2125                         break;
2126                 case 'Z':
2127                 case 'z':
2128                 {
2129                         size_t *s = (size_t *)va_arg(args, size_t *);
2130                         *s = (size_t)simple_strtoul(str, &next, base);
2131                 }
2132                 break;
2133                 default:
2134                         if (is_sign) {
2135                                 int *i = (int *)va_arg(args, int *);
2136                                 *i = (int)simple_strtol(str, &next, base);
2137                         } else {
2138                                 unsigned int *i = (unsigned int *)va_arg(args, unsigned int*);
2139                                 *i = (unsigned int)simple_strtoul(str, &next, base);
2140                         }
2141                         break;
2142                 }
2143                 num++;
2144
2145                 if (!next)
2146                         break;
2147                 str = next;
2148         }
2149
2150         /*
2151          * Now we've come all the way through so either the input string or the
2152          * format ended. In the former case, there can be a %n at the current
2153          * position in the format that needs to be filled.
2154          */
2155         if (*fmt == '%' && *(fmt + 1) == 'n') {
2156                 int *p = (int *)va_arg(args, int *);
2157                 *p = str - buf;
2158         }
2159
2160         return num;
2161 }
2162 EXPORT_SYMBOL(vsscanf);
2163
2164 /**
2165  * sscanf - Unformat a buffer into a list of arguments
2166  * @buf:        input buffer
2167  * @fmt:        formatting of buffer
2168  * @...:        resulting arguments
2169  */
2170 int sscanf(const char *buf, const char *fmt, ...)
2171 {
2172         va_list args;
2173         int i;
2174
2175         va_start(args, fmt);
2176         i = vsscanf(buf, fmt, args);
2177         va_end(args);
2178
2179         return i;
2180 }
2181 EXPORT_SYMBOL(sscanf);