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) {
 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                 } else if ((kptr_restrict == 0) ||
1051                          (kptr_restrict == 1 &&
1052                           has_capability_noaudit(current, CAP_SYSLOG)))
1053                         break;
1054
1055                 if (spec.field_width == -1) {
1056                         spec.field_width = 2 * sizeof(void *);
1057                         spec.flags |= ZEROPAD;
1058                 }
1059                 return number(buf, end, 0, spec);
1060         }
1061         spec.flags |= SMALL;
1062         if (spec.field_width == -1) {
1063                 spec.field_width = 2 * sizeof(void *);
1064                 spec.flags |= ZEROPAD;
1065         }
1066         spec.base = 16;
1067
1068         return number(buf, end, (unsigned long) ptr, spec);
1069 }
1070
1071 /*
1072  * Helper function to decode printf style format.
1073  * Each call decode a token from the format and return the
1074  * number of characters read (or likely the delta where it wants
1075  * to go on the next call).
1076  * The decoded token is returned through the parameters
1077  *
1078  * 'h', 'l', or 'L' for integer fields
1079  * 'z' support added 23/7/1999 S.H.
1080  * 'z' changed to 'Z' --davidm 1/25/99
1081  * 't' added for ptrdiff_t
1082  *
1083  * @fmt: the format string
1084  * @type of the token returned
1085  * @flags: various flags such as +, -, # tokens..
1086  * @field_width: overwritten width
1087  * @base: base of the number (octal, hex, ...)
1088  * @precision: precision of a number
1089  * @qualifier: qualifier of a number (long, size_t, ...)
1090  */
1091 static noinline_for_stack
1092 int format_decode(const char *fmt, struct printf_spec *spec)
1093 {
1094         const char *start = fmt;
1095
1096         /* we finished early by reading the field width */
1097         if (spec->type == FORMAT_TYPE_WIDTH) {
1098                 if (spec->field_width < 0) {
1099                         spec->field_width = -spec->field_width;
1100                         spec->flags |= LEFT;
1101                 }
1102                 spec->type = FORMAT_TYPE_NONE;
1103                 goto precision;
1104         }
1105
1106         /* we finished early by reading the precision */
1107         if (spec->type == FORMAT_TYPE_PRECISION) {
1108                 if (spec->precision < 0)
1109                         spec->precision = 0;
1110
1111                 spec->type = FORMAT_TYPE_NONE;
1112                 goto qualifier;
1113         }
1114
1115         /* By default */
1116         spec->type = FORMAT_TYPE_NONE;
1117
1118         for (; *fmt ; ++fmt) {
1119                 if (*fmt == '%')
1120                         break;
1121         }
1122
1123         /* Return the current non-format string */
1124         if (fmt != start || !*fmt)
1125                 return fmt - start;
1126
1127         /* Process flags */
1128         spec->flags = 0;
1129
1130         while (1) { /* this also skips first '%' */
1131                 bool found = true;
1132
1133                 ++fmt;
1134
1135                 switch (*fmt) {
1136                 case '-': spec->flags |= LEFT;    break;
1137                 case '+': spec->flags |= PLUS;    break;
1138                 case ' ': spec->flags |= SPACE;   break;
1139                 case '#': spec->flags |= SPECIAL; break;
1140                 case '0': spec->flags |= ZEROPAD; break;
1141                 default:  found = false;
1142                 }
1143
1144                 if (!found)
1145                         break;
1146         }
1147
1148         /* get field width */
1149         spec->field_width = -1;
1150
1151         if (isdigit(*fmt))
1152                 spec->field_width = skip_atoi(&fmt);
1153         else if (*fmt == '*') {
1154                 /* it's the next argument */
1155                 spec->type = FORMAT_TYPE_WIDTH;
1156                 return ++fmt - start;
1157         }
1158
1159 precision:
1160         /* get the precision */
1161         spec->precision = -1;
1162         if (*fmt == '.') {
1163                 ++fmt;
1164                 if (isdigit(*fmt)) {
1165                         spec->precision = skip_atoi(&fmt);
1166                         if (spec->precision < 0)
1167                                 spec->precision = 0;
1168                 } else if (*fmt == '*') {
1169                         /* it's the next argument */
1170                         spec->type = FORMAT_TYPE_PRECISION;
1171                         return ++fmt - start;
1172                 }
1173         }
1174
1175 qualifier:
1176         /* get the conversion qualifier */
1177         spec->qualifier = -1;
1178         if (*fmt == 'h' || TOLOWER(*fmt) == 'l' ||
1179             TOLOWER(*fmt) == 'z' || *fmt == 't') {
1180                 spec->qualifier = *fmt++;
1181                 if (unlikely(spec->qualifier == *fmt)) {
1182                         if (spec->qualifier == 'l') {
1183                                 spec->qualifier = 'L';
1184                                 ++fmt;
1185                         } else if (spec->qualifier == 'h') {
1186                                 spec->qualifier = 'H';
1187                                 ++fmt;
1188                         }
1189                 }
1190         }
1191
1192         /* default base */
1193         spec->base = 10;
1194         switch (*fmt) {
1195         case 'c':
1196                 spec->type = FORMAT_TYPE_CHAR;
1197                 return ++fmt - start;
1198
1199         case 's':
1200                 spec->type = FORMAT_TYPE_STR;
1201                 return ++fmt - start;
1202
1203         case 'p':
1204                 spec->type = FORMAT_TYPE_PTR;
1205                 return fmt - start;
1206                 /* skip alnum */
1207
1208         case 'n':
1209                 spec->type = FORMAT_TYPE_NRCHARS;
1210                 return ++fmt - start;
1211
1212         case '%':
1213                 spec->type = FORMAT_TYPE_PERCENT_CHAR;
1214                 return ++fmt - start;
1215
1216         /* integer number formats - set up the flags and "break" */
1217         case 'o':
1218                 spec->base = 8;
1219                 break;
1220
1221         case 'x':
1222                 spec->flags |= SMALL;
1223
1224         case 'X':
1225                 spec->base = 16;
1226                 break;
1227
1228         case 'd':
1229         case 'i':
1230                 spec->flags |= SIGN;
1231         case 'u':
1232                 break;
1233
1234         default:
1235                 spec->type = FORMAT_TYPE_INVALID;
1236                 return fmt - start;
1237         }
1238
1239         if (spec->qualifier == 'L')
1240                 spec->type = FORMAT_TYPE_LONG_LONG;
1241         else if (spec->qualifier == 'l') {
1242                 if (spec->flags & SIGN)
1243                         spec->type = FORMAT_TYPE_LONG;
1244                 else
1245                         spec->type = FORMAT_TYPE_ULONG;
1246         } else if (TOLOWER(spec->qualifier) == 'z') {
1247                 spec->type = FORMAT_TYPE_SIZE_T;
1248         } else if (spec->qualifier == 't') {
1249                 spec->type = FORMAT_TYPE_PTRDIFF;
1250         } else if (spec->qualifier == 'H') {
1251                 if (spec->flags & SIGN)
1252                         spec->type = FORMAT_TYPE_BYTE;
1253                 else
1254                         spec->type = FORMAT_TYPE_UBYTE;
1255         } else if (spec->qualifier == 'h') {
1256                 if (spec->flags & SIGN)
1257                         spec->type = FORMAT_TYPE_SHORT;
1258                 else
1259                         spec->type = FORMAT_TYPE_USHORT;
1260         } else {
1261                 if (spec->flags & SIGN)
1262                         spec->type = FORMAT_TYPE_INT;
1263                 else
1264                         spec->type = FORMAT_TYPE_UINT;
1265         }
1266
1267         return ++fmt - start;
1268 }
1269
1270 /**
1271  * vsnprintf - Format a string and place it in a buffer
1272  * @buf: The buffer to place the result into
1273  * @size: The size of the buffer, including the trailing null space
1274  * @fmt: The format string to use
1275  * @args: Arguments for the format string
1276  *
1277  * This function follows C99 vsnprintf, but has some extensions:
1278  * %pS output the name of a text symbol with offset
1279  * %ps output the name of a text symbol without offset
1280  * %pF output the name of a function pointer with its offset
1281  * %pf output the name of a function pointer without its offset
1282  * %pR output the address range in a struct resource with decoded flags
1283  * %pr output the address range in a struct resource with raw flags
1284  * %pM output a 6-byte MAC address with colons
1285  * %pm output a 6-byte MAC address without colons
1286  * %pI4 print an IPv4 address without leading zeros
1287  * %pi4 print an IPv4 address with leading zeros
1288  * %pI6 print an IPv6 address with colons
1289  * %pi6 print an IPv6 address without colons
1290  * %pI6c print an IPv6 address as specified by
1291  *   http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00
1292  * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
1293  *   case.
1294  * %n is ignored
1295  *
1296  * The return value is the number of characters which would
1297  * be generated for the given input, excluding the trailing
1298  * '\0', as per ISO C99. If you want to have the exact
1299  * number of characters written into @buf as return value
1300  * (not including the trailing '\0'), use vscnprintf(). If the
1301  * return is greater than or equal to @size, the resulting
1302  * string is truncated.
1303  *
1304  * Call this function if you are already dealing with a va_list.
1305  * You probably want snprintf() instead.
1306  */
1307 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
1308 {
1309         unsigned long long num;
1310         char *str, *end;
1311         struct printf_spec spec = {0};
1312
1313         /* Reject out-of-range values early.  Large positive sizes are
1314            used for unknown buffer sizes. */
1315         if (WARN_ON_ONCE((int) size < 0))
1316                 return 0;
1317
1318         str = buf;
1319         end = buf + size;
1320
1321         /* Make sure end is always >= buf */
1322         if (end < buf) {
1323                 end = ((void *)-1);
1324                 size = end - buf;
1325         }
1326
1327         while (*fmt) {
1328                 const char *old_fmt = fmt;
1329                 int read = format_decode(fmt, &spec);
1330
1331                 fmt += read;
1332
1333                 switch (spec.type) {
1334                 case FORMAT_TYPE_NONE: {
1335                         int copy = read;
1336                         if (str < end) {
1337                                 if (copy > end - str)
1338                                         copy = end - str;
1339                                 memcpy(str, old_fmt, copy);
1340                         }
1341                         str += read;
1342                         break;
1343                 }
1344
1345                 case FORMAT_TYPE_WIDTH:
1346                         spec.field_width = va_arg(args, int);
1347                         break;
1348
1349                 case FORMAT_TYPE_PRECISION:
1350                         spec.precision = va_arg(args, int);
1351                         break;
1352
1353                 case FORMAT_TYPE_CHAR: {
1354                         char c;
1355
1356                         if (!(spec.flags & LEFT)) {
1357                                 while (--spec.field_width > 0) {
1358                                         if (str < end)
1359                                                 *str = ' ';
1360                                         ++str;
1361
1362                                 }
1363                         }
1364                         c = (unsigned char) va_arg(args, int);
1365                         if (str < end)
1366                                 *str = c;
1367                         ++str;
1368                         while (--spec.field_width > 0) {
1369                                 if (str < end)
1370                                         *str = ' ';
1371                                 ++str;
1372                         }
1373                         break;
1374                 }
1375
1376                 case FORMAT_TYPE_STR:
1377                         str = string(str, end, va_arg(args, char *), spec);
1378                         break;
1379
1380                 case FORMAT_TYPE_PTR:
1381                         str = pointer(fmt+1, str, end, va_arg(args, void *),
1382                                       spec);
1383                         while (isalnum(*fmt))
1384                                 fmt++;
1385                         break;
1386
1387                 case FORMAT_TYPE_PERCENT_CHAR:
1388                         if (str < end)
1389                                 *str = '%';
1390                         ++str;
1391                         break;
1392
1393                 case FORMAT_TYPE_INVALID:
1394                         if (str < end)
1395                                 *str = '%';
1396                         ++str;
1397                         break;
1398
1399                 case FORMAT_TYPE_NRCHARS: {
1400                         u8 qualifier = spec.qualifier;
1401
1402                         if (qualifier == 'l') {
1403                                 long *ip = va_arg(args, long *);
1404                                 *ip = (str - buf);
1405                         } else if (TOLOWER(qualifier) == 'z') {
1406                                 size_t *ip = va_arg(args, size_t *);
1407                                 *ip = (str - buf);
1408                         } else {
1409                                 int *ip = va_arg(args, int *);
1410                                 *ip = (str - buf);
1411                         }
1412                         break;
1413                 }
1414
1415                 default:
1416                         switch (spec.type) {
1417                         case FORMAT_TYPE_LONG_LONG:
1418                                 num = va_arg(args, long long);
1419                                 break;
1420                         case FORMAT_TYPE_ULONG:
1421                                 num = va_arg(args, unsigned long);
1422                                 break;
1423                         case FORMAT_TYPE_LONG:
1424                                 num = va_arg(args, long);
1425                                 break;
1426                         case FORMAT_TYPE_SIZE_T:
1427                                 num = va_arg(args, size_t);
1428                                 break;
1429                         case FORMAT_TYPE_PTRDIFF:
1430                                 num = va_arg(args, ptrdiff_t);
1431                                 break;
1432                         case FORMAT_TYPE_UBYTE:
1433                                 num = (unsigned char) va_arg(args, int);
1434                                 break;
1435                         case FORMAT_TYPE_BYTE:
1436                                 num = (signed char) va_arg(args, int);
1437                                 break;
1438                         case FORMAT_TYPE_USHORT:
1439                                 num = (unsigned short) va_arg(args, int);
1440                                 break;
1441                         case FORMAT_TYPE_SHORT:
1442                                 num = (short) va_arg(args, int);
1443                                 break;
1444                         case FORMAT_TYPE_INT:
1445                                 num = (int) va_arg(args, int);
1446                                 break;
1447                         default:
1448                                 num = va_arg(args, unsigned int);
1449                         }
1450
1451                         str = number(str, end, num, spec);
1452                 }
1453         }
1454
1455         if (size > 0) {
1456                 if (str < end)
1457                         *str = '\0';
1458                 else
1459                         end[-1] = '\0';
1460         }
1461
1462         /* the trailing null byte doesn't count towards the total */
1463         return str-buf;
1464
1465 }
1466 EXPORT_SYMBOL(vsnprintf);
1467
1468 /**
1469  * vscnprintf - Format a string and place it in a buffer
1470  * @buf: The buffer to place the result into
1471  * @size: The size of the buffer, including the trailing null space
1472  * @fmt: The format string to use
1473  * @args: Arguments for the format string
1474  *
1475  * The return value is the number of characters which have been written into
1476  * the @buf not including the trailing '\0'. If @size is == 0 the function
1477  * returns 0.
1478  *
1479  * Call this function if you are already dealing with a va_list.
1480  * You probably want scnprintf() instead.
1481  *
1482  * See the vsnprintf() documentation for format string extensions over C99.
1483  */
1484 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
1485 {
1486         int i;
1487
1488         i = vsnprintf(buf, size, fmt, args);
1489
1490         if (likely(i < size))
1491                 return i;
1492         if (size != 0)
1493                 return size - 1;
1494         return 0;
1495 }
1496 EXPORT_SYMBOL(vscnprintf);
1497
1498 /**
1499  * snprintf - Format a string and place it in a buffer
1500  * @buf: The buffer to place the result into
1501  * @size: The size of the buffer, including the trailing null space
1502  * @fmt: The format string to use
1503  * @...: Arguments for the format string
1504  *
1505  * The return value is the number of characters which would be
1506  * generated for the given input, excluding the trailing null,
1507  * as per ISO C99.  If the return is greater than or equal to
1508  * @size, the resulting string is truncated.
1509  *
1510  * See the vsnprintf() documentation for format string extensions over C99.
1511  */
1512 int snprintf(char *buf, size_t size, const char *fmt, ...)
1513 {
1514         va_list args;
1515         int i;
1516
1517         va_start(args, fmt);
1518         i = vsnprintf(buf, size, fmt, args);
1519         va_end(args);
1520
1521         return i;
1522 }
1523 EXPORT_SYMBOL(snprintf);
1524
1525 /**
1526  * scnprintf - Format a string and place it in a buffer
1527  * @buf: The buffer to place the result into
1528  * @size: The size of the buffer, including the trailing null space
1529  * @fmt: The format string to use
1530  * @...: Arguments for the format string
1531  *
1532  * The return value is the number of characters written into @buf not including
1533  * the trailing '\0'. If @size is == 0 the function returns 0.
1534  */
1535
1536 int scnprintf(char *buf, size_t size, const char *fmt, ...)
1537 {
1538         va_list args;
1539         int i;
1540
1541         va_start(args, fmt);
1542         i = vscnprintf(buf, size, fmt, args);
1543         va_end(args);
1544
1545         return i;
1546 }
1547 EXPORT_SYMBOL(scnprintf);
1548
1549 /**
1550  * vsprintf - Format a string and place it in a buffer
1551  * @buf: The buffer to place the result into
1552  * @fmt: The format string to use
1553  * @args: Arguments for the format string
1554  *
1555  * The function returns the number of characters written
1556  * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
1557  * buffer overflows.
1558  *
1559  * Call this function if you are already dealing with a va_list.
1560  * You probably want sprintf() instead.
1561  *
1562  * See the vsnprintf() documentation for format string extensions over C99.
1563  */
1564 int vsprintf(char *buf, const char *fmt, va_list args)
1565 {
1566         return vsnprintf(buf, INT_MAX, fmt, args);
1567 }
1568 EXPORT_SYMBOL(vsprintf);
1569
1570 /**
1571  * sprintf - Format a string and place it in a buffer
1572  * @buf: The buffer to place the result into
1573  * @fmt: The format string to use
1574  * @...: Arguments for the format string
1575  *
1576  * The function returns the number of characters written
1577  * into @buf. Use snprintf() or scnprintf() in order to avoid
1578  * buffer overflows.
1579  *
1580  * See the vsnprintf() documentation for format string extensions over C99.
1581  */
1582 int sprintf(char *buf, const char *fmt, ...)
1583 {
1584         va_list args;
1585         int i;
1586
1587         va_start(args, fmt);
1588         i = vsnprintf(buf, INT_MAX, fmt, args);
1589         va_end(args);
1590
1591         return i;
1592 }
1593 EXPORT_SYMBOL(sprintf);
1594
1595 #ifdef CONFIG_BINARY_PRINTF
1596 /*
1597  * bprintf service:
1598  * vbin_printf() - VA arguments to binary data
1599  * bstr_printf() - Binary data to text string
1600  */
1601
1602 /**
1603  * vbin_printf - Parse a format string and place args' binary value in a buffer
1604  * @bin_buf: The buffer to place args' binary value
1605  * @size: The size of the buffer(by words(32bits), not characters)
1606  * @fmt: The format string to use
1607  * @args: Arguments for the format string
1608  *
1609  * The format follows C99 vsnprintf, except %n is ignored, and its argument
1610  * is skiped.
1611  *
1612  * The return value is the number of words(32bits) which would be generated for
1613  * the given input.
1614  *
1615  * NOTE:
1616  * If the return value is greater than @size, the resulting bin_buf is NOT
1617  * valid for bstr_printf().
1618  */
1619 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
1620 {
1621         struct printf_spec spec = {0};
1622         char *str, *end;
1623
1624         str = (char *)bin_buf;
1625         end = (char *)(bin_buf + size);
1626
1627 #define save_arg(type)                                                  \
1628 do {                                                                    \
1629         if (sizeof(type) == 8) {                                        \
1630                 unsigned long long value;                               \
1631                 str = PTR_ALIGN(str, sizeof(u32));                      \
1632                 value = va_arg(args, unsigned long long);               \
1633                 if (str + sizeof(type) <= end) {                        \
1634                         *(u32 *)str = *(u32 *)&value;                   \
1635                         *(u32 *)(str + 4) = *((u32 *)&value + 1);       \
1636                 }                                                       \
1637         } else {                                                        \
1638                 unsigned long value;                                    \
1639                 str = PTR_ALIGN(str, sizeof(type));                     \
1640                 value = va_arg(args, int);                              \
1641                 if (str + sizeof(type) <= end)                          \
1642                         *(typeof(type) *)str = (type)value;             \
1643         }                                                               \
1644         str += sizeof(type);                                            \
1645 } while (0)
1646
1647         while (*fmt) {
1648                 int read = format_decode(fmt, &spec);
1649
1650                 fmt += read;
1651
1652                 switch (spec.type) {
1653                 case FORMAT_TYPE_NONE:
1654                 case FORMAT_TYPE_INVALID:
1655                 case FORMAT_TYPE_PERCENT_CHAR:
1656                         break;
1657
1658                 case FORMAT_TYPE_WIDTH:
1659                 case FORMAT_TYPE_PRECISION:
1660                         save_arg(int);
1661                         break;
1662
1663                 case FORMAT_TYPE_CHAR:
1664                         save_arg(char);
1665                         break;
1666
1667                 case FORMAT_TYPE_STR: {
1668                         const char *save_str = va_arg(args, char *);
1669                         size_t len;
1670
1671                         if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
1672                                         || (unsigned long)save_str < PAGE_SIZE)
1673                                 save_str = "(null)";
1674                         len = strlen(save_str) + 1;
1675                         if (str + len < end)
1676                                 memcpy(str, save_str, len);
1677                         str += len;
1678                         break;
1679                 }
1680
1681                 case FORMAT_TYPE_PTR:
1682                         save_arg(void *);
1683                         /* skip all alphanumeric pointer suffixes */
1684                         while (isalnum(*fmt))
1685                                 fmt++;
1686                         break;
1687
1688                 case FORMAT_TYPE_NRCHARS: {
1689                         /* skip %n 's argument */
1690                         u8 qualifier = spec.qualifier;
1691                         void *skip_arg;
1692                         if (qualifier == 'l')
1693                                 skip_arg = va_arg(args, long *);
1694                         else if (TOLOWER(qualifier) == 'z')
1695                                 skip_arg = va_arg(args, size_t *);
1696                         else
1697                                 skip_arg = va_arg(args, int *);
1698                         break;
1699                 }
1700
1701                 default:
1702                         switch (spec.type) {
1703
1704                         case FORMAT_TYPE_LONG_LONG:
1705                                 save_arg(long long);
1706                                 break;
1707                         case FORMAT_TYPE_ULONG:
1708                         case FORMAT_TYPE_LONG:
1709                                 save_arg(unsigned long);
1710                                 break;
1711                         case FORMAT_TYPE_SIZE_T:
1712                                 save_arg(size_t);
1713                                 break;
1714                         case FORMAT_TYPE_PTRDIFF:
1715                                 save_arg(ptrdiff_t);
1716                                 break;
1717                         case FORMAT_TYPE_UBYTE:
1718                         case FORMAT_TYPE_BYTE:
1719                                 save_arg(char);
1720                                 break;
1721                         case FORMAT_TYPE_USHORT:
1722                         case FORMAT_TYPE_SHORT:
1723                                 save_arg(short);
1724                                 break;
1725                         default:
1726                                 save_arg(int);
1727                         }
1728                 }
1729         }
1730
1731         return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
1732 #undef save_arg
1733 }
1734 EXPORT_SYMBOL_GPL(vbin_printf);
1735
1736 /**
1737  * bstr_printf - Format a string from binary arguments and place it in a buffer
1738  * @buf: The buffer to place the result into
1739  * @size: The size of the buffer, including the trailing null space
1740  * @fmt: The format string to use
1741  * @bin_buf: Binary arguments for the format string
1742  *
1743  * This function like C99 vsnprintf, but the difference is that vsnprintf gets
1744  * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
1745  * a binary buffer that generated by vbin_printf.
1746  *
1747  * The format follows C99 vsnprintf, but has some extensions:
1748  *  see vsnprintf comment for details.
1749  *
1750  * The return value is the number of characters which would
1751  * be generated for the given input, excluding the trailing
1752  * '\0', as per ISO C99. If you want to have the exact
1753  * number of characters written into @buf as return value
1754  * (not including the trailing '\0'), use vscnprintf(). If the
1755  * return is greater than or equal to @size, the resulting
1756  * string is truncated.
1757  */
1758 int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
1759 {
1760         struct printf_spec spec = {0};
1761         char *str, *end;
1762         const char *args = (const char *)bin_buf;
1763
1764         if (WARN_ON_ONCE((int) size < 0))
1765                 return 0;
1766
1767         str = buf;
1768         end = buf + size;
1769
1770 #define get_arg(type)                                                   \
1771 ({                                                                      \
1772         typeof(type) value;                                             \
1773         if (sizeof(type) == 8) {                                        \
1774                 args = PTR_ALIGN(args, sizeof(u32));                    \
1775                 *(u32 *)&value = *(u32 *)args;                          \
1776                 *((u32 *)&value + 1) = *(u32 *)(args + 4);              \
1777         } else {                                                        \
1778                 args = PTR_ALIGN(args, sizeof(type));                   \
1779                 value = *(typeof(type) *)args;                          \
1780         }                                                               \
1781         args += sizeof(type);                                           \
1782         value;                                                          \
1783 })
1784
1785         /* Make sure end is always >= buf */
1786         if (end < buf) {
1787                 end = ((void *)-1);
1788                 size = end - buf;
1789         }
1790
1791         while (*fmt) {
1792                 const char *old_fmt = fmt;
1793                 int read = format_decode(fmt, &spec);
1794
1795                 fmt += read;
1796
1797                 switch (spec.type) {
1798                 case FORMAT_TYPE_NONE: {
1799                         int copy = read;
1800                         if (str < end) {
1801                                 if (copy > end - str)
1802                                         copy = end - str;
1803                                 memcpy(str, old_fmt, copy);
1804                         }
1805                         str += read;
1806                         break;
1807                 }
1808
1809                 case FORMAT_TYPE_WIDTH:
1810                         spec.field_width = get_arg(int);
1811                         break;
1812
1813                 case FORMAT_TYPE_PRECISION:
1814                         spec.precision = get_arg(int);
1815                         break;
1816
1817                 case FORMAT_TYPE_CHAR: {
1818                         char c;
1819
1820                         if (!(spec.flags & LEFT)) {
1821                                 while (--spec.field_width > 0) {
1822                                         if (str < end)
1823                                                 *str = ' ';
1824                                         ++str;
1825                                 }
1826                         }
1827                         c = (unsigned char) get_arg(char);
1828                         if (str < end)
1829                                 *str = c;
1830                         ++str;
1831                         while (--spec.field_width > 0) {
1832                                 if (str < end)
1833                                         *str = ' ';
1834                                 ++str;
1835                         }
1836                         break;
1837                 }
1838
1839                 case FORMAT_TYPE_STR: {
1840                         const char *str_arg = args;
1841                         args += strlen(str_arg) + 1;
1842                         str = string(str, end, (char *)str_arg, spec);
1843                         break;
1844                 }
1845
1846                 case FORMAT_TYPE_PTR:
1847                         str = pointer(fmt+1, str, end, get_arg(void *), spec);
1848                         while (isalnum(*fmt))
1849                                 fmt++;
1850                         break;
1851
1852                 case FORMAT_TYPE_PERCENT_CHAR:
1853                 case FORMAT_TYPE_INVALID:
1854                         if (str < end)
1855                                 *str = '%';
1856                         ++str;
1857                         break;
1858
1859                 case FORMAT_TYPE_NRCHARS:
1860                         /* skip */
1861                         break;
1862
1863                 default: {
1864                         unsigned long long num;
1865
1866                         switch (spec.type) {
1867
1868                         case FORMAT_TYPE_LONG_LONG:
1869                                 num = get_arg(long long);
1870                                 break;
1871                         case FORMAT_TYPE_ULONG:
1872                         case FORMAT_TYPE_LONG:
1873                                 num = get_arg(unsigned long);
1874                                 break;
1875                         case FORMAT_TYPE_SIZE_T:
1876                                 num = get_arg(size_t);
1877                                 break;
1878                         case FORMAT_TYPE_PTRDIFF:
1879                                 num = get_arg(ptrdiff_t);
1880                                 break;
1881                         case FORMAT_TYPE_UBYTE:
1882                                 num = get_arg(unsigned char);
1883                                 break;
1884                         case FORMAT_TYPE_BYTE:
1885                                 num = get_arg(signed char);
1886                                 break;
1887                         case FORMAT_TYPE_USHORT:
1888                                 num = get_arg(unsigned short);
1889                                 break;
1890                         case FORMAT_TYPE_SHORT:
1891                                 num = get_arg(short);
1892                                 break;
1893                         case FORMAT_TYPE_UINT:
1894                                 num = get_arg(unsigned int);
1895                                 break;
1896                         default:
1897                                 num = get_arg(int);
1898                         }
1899
1900                         str = number(str, end, num, spec);
1901                 } /* default: */
1902                 } /* switch(spec.type) */
1903         } /* while(*fmt) */
1904
1905         if (size > 0) {
1906                 if (str < end)
1907                         *str = '\0';
1908                 else
1909                         end[-1] = '\0';
1910         }
1911
1912 #undef get_arg
1913
1914         /* the trailing null byte doesn't count towards the total */
1915         return str - buf;
1916 }
1917 EXPORT_SYMBOL_GPL(bstr_printf);
1918
1919 /**
1920  * bprintf - Parse a format string and place args' binary value in a buffer
1921  * @bin_buf: The buffer to place args' binary value
1922  * @size: The size of the buffer(by words(32bits), not characters)
1923  * @fmt: The format string to use
1924  * @...: Arguments for the format string
1925  *
1926  * The function returns the number of words(u32) written
1927  * into @bin_buf.
1928  */
1929 int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
1930 {
1931         va_list args;
1932         int ret;
1933
1934         va_start(args, fmt);
1935         ret = vbin_printf(bin_buf, size, fmt, args);
1936         va_end(args);
1937
1938         return ret;
1939 }
1940 EXPORT_SYMBOL_GPL(bprintf);
1941
1942 #endif /* CONFIG_BINARY_PRINTF */
1943
1944 /**
1945  * vsscanf - Unformat a buffer into a list of arguments
1946  * @buf:        input buffer
1947  * @fmt:        format of buffer
1948  * @args:       arguments
1949  */
1950 int vsscanf(const char *buf, const char *fmt, va_list args)
1951 {
1952         const char *str = buf;
1953         char *next;
1954         char digit;
1955         int num = 0;
1956         u8 qualifier;
1957         u8 base;
1958         s16 field_width;
1959         bool is_sign;
1960
1961         while (*fmt && *str) {
1962                 /* skip any white space in format */
1963                 /* white space in format matchs any amount of
1964                  * white space, including none, in the input.
1965                  */
1966                 if (isspace(*fmt)) {
1967                         fmt = skip_spaces(++fmt);
1968                         str = skip_spaces(str);
1969                 }
1970
1971                 /* anything that is not a conversion must match exactly */
1972                 if (*fmt != '%' && *fmt) {
1973                         if (*fmt++ != *str++)
1974                                 break;
1975                         continue;
1976                 }
1977
1978                 if (!*fmt)
1979                         break;
1980                 ++fmt;
1981
1982                 /* skip this conversion.
1983                  * advance both strings to next white space
1984                  */
1985                 if (*fmt == '*') {
1986                         while (!isspace(*fmt) && *fmt != '%' && *fmt)
1987                                 fmt++;
1988                         while (!isspace(*str) && *str)
1989                                 str++;
1990                         continue;
1991                 }
1992
1993                 /* get field width */
1994                 field_width = -1;
1995                 if (isdigit(*fmt))
1996                         field_width = skip_atoi(&fmt);
1997
1998                 /* get conversion qualifier */
1999                 qualifier = -1;
2000                 if (*fmt == 'h' || TOLOWER(*fmt) == 'l' ||
2001                     TOLOWER(*fmt) == 'z') {
2002                         qualifier = *fmt++;
2003                         if (unlikely(qualifier == *fmt)) {
2004                                 if (qualifier == 'h') {
2005                                         qualifier = 'H';
2006                                         fmt++;
2007                                 } else if (qualifier == 'l') {
2008                                         qualifier = 'L';
2009                                         fmt++;
2010                                 }
2011                         }
2012                 }
2013
2014                 if (!*fmt || !*str)
2015                         break;
2016
2017                 base = 10;
2018                 is_sign = 0;
2019
2020                 switch (*fmt++) {
2021                 case 'c':
2022                 {
2023                         char *s = (char *)va_arg(args, char*);
2024                         if (field_width == -1)
2025                                 field_width = 1;
2026                         do {
2027                                 *s++ = *str++;
2028                         } while (--field_width > 0 && *str);
2029                         num++;
2030                 }
2031                 continue;
2032                 case 's':
2033                 {
2034                         char *s = (char *)va_arg(args, char *);
2035                         if (field_width == -1)
2036                                 field_width = SHRT_MAX;
2037                         /* first, skip leading white space in buffer */
2038                         str = skip_spaces(str);
2039
2040                         /* now copy until next white space */
2041                         while (*str && !isspace(*str) && field_width--)
2042                                 *s++ = *str++;
2043                         *s = '\0';
2044                         num++;
2045                 }
2046                 continue;
2047                 case 'n':
2048                         /* return number of characters read so far */
2049                 {
2050                         int *i = (int *)va_arg(args, int*);
2051                         *i = str - buf;
2052                 }
2053                 continue;
2054                 case 'o':
2055                         base = 8;
2056                         break;
2057                 case 'x':
2058                 case 'X':
2059                         base = 16;
2060                         break;
2061                 case 'i':
2062                         base = 0;
2063                 case 'd':
2064                         is_sign = 1;
2065                 case 'u':
2066                         break;
2067                 case '%':
2068                         /* looking for '%' in str */
2069                         if (*str++ != '%')
2070                                 return num;
2071                         continue;
2072                 default:
2073                         /* invalid format; stop here */
2074                         return num;
2075                 }
2076
2077                 /* have some sort of integer conversion.
2078                  * first, skip white space in buffer.
2079                  */
2080                 str = skip_spaces(str);
2081
2082                 digit = *str;
2083                 if (is_sign && digit == '-')
2084                         digit = *(str + 1);
2085
2086                 if (!digit
2087                     || (base == 16 && !isxdigit(digit))
2088                     || (base == 10 && !isdigit(digit))
2089                     || (base == 8 && (!isdigit(digit) || digit > '7'))
2090                     || (base == 0 && !isdigit(digit)))
2091                         break;
2092
2093                 switch (qualifier) {
2094                 case 'H':       /* that's 'hh' in format */
2095                         if (is_sign) {
2096                                 signed char *s = (signed char *)va_arg(args, signed char *);
2097                                 *s = (signed char)simple_strtol(str, &next, base);
2098                         } else {
2099                                 unsigned char *s = (unsigned char *)va_arg(args, unsigned char *);
2100                                 *s = (unsigned char)simple_strtoul(str, &next, base);
2101                         }
2102                         break;
2103                 case 'h':
2104                         if (is_sign) {
2105                                 short *s = (short *)va_arg(args, short *);
2106                                 *s = (short)simple_strtol(str, &next, base);
2107                         } else {
2108                                 unsigned short *s = (unsigned short *)va_arg(args, unsigned short *);
2109                                 *s = (unsigned short)simple_strtoul(str, &next, base);
2110                         }
2111                         break;
2112                 case 'l':
2113                         if (is_sign) {
2114                                 long *l = (long *)va_arg(args, long *);
2115                                 *l = simple_strtol(str, &next, base);
2116                         } else {
2117                                 unsigned long *l = (unsigned long *)va_arg(args, unsigned long *);
2118                                 *l = simple_strtoul(str, &next, base);
2119                         }
2120                         break;
2121                 case 'L':
2122                         if (is_sign) {
2123                                 long long *l = (long long *)va_arg(args, long long *);
2124                                 *l = simple_strtoll(str, &next, base);
2125                         } else {
2126                                 unsigned long long *l = (unsigned long long *)va_arg(args, unsigned long long *);
2127                                 *l = simple_strtoull(str, &next, base);
2128                         }
2129                         break;
2130                 case 'Z':
2131                 case 'z':
2132                 {
2133                         size_t *s = (size_t *)va_arg(args, size_t *);
2134                         *s = (size_t)simple_strtoul(str, &next, base);
2135                 }
2136                 break;
2137                 default:
2138                         if (is_sign) {
2139                                 int *i = (int *)va_arg(args, int *);
2140                                 *i = (int)simple_strtol(str, &next, base);
2141                         } else {
2142                                 unsigned int *i = (unsigned int *)va_arg(args, unsigned int*);
2143                                 *i = (unsigned int)simple_strtoul(str, &next, base);
2144                         }
2145                         break;
2146                 }
2147                 num++;
2148
2149                 if (!next)
2150                         break;
2151                 str = next;
2152         }
2153
2154         /*
2155          * Now we've come all the way through so either the input string or the
2156          * format ended. In the former case, there can be a %n at the current
2157          * position in the format that needs to be filled.
2158          */
2159         if (*fmt == '%' && *(fmt + 1) == 'n') {
2160                 int *p = (int *)va_arg(args, int *);
2161                 *p = str - buf;
2162         }
2163
2164         return num;
2165 }
2166 EXPORT_SYMBOL(vsscanf);
2167
2168 /**
2169  * sscanf - Unformat a buffer into a list of arguments
2170  * @buf:        input buffer
2171  * @fmt:        formatting of buffer
2172  * @...:        resulting arguments
2173  */
2174 int sscanf(const char *buf, const char *fmt, ...)
2175 {
2176         va_list args;
2177         int i;
2178
2179         va_start(args, fmt);
2180         i = vsscanf(buf, fmt, args);
2181         va_end(args);
2182
2183         return i;
2184 }
2185 EXPORT_SYMBOL(sscanf);