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
  26 #include <asm/div64.h>
  27
  28 /**
  29  * simple_strtoul - convert a string to an unsigned long
  30  * @cp: The start of the string
  31  * @endp: A pointer to the end of the parsed string will be placed here
  32  * @base: The number base to use
  33  */
  34 unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base)
  35 {
  36         unsigned long result = 0,value;
  37
  38         if (!base) {
  39                 base = 10;
  40                 if (*cp == '0') {
  41                         base = 8;
  42                         cp++;
  43                         if ((*cp == 'x') && isxdigit(cp[1])) {
  44                                 cp++;
  45                                 base = 16;
  46                         }
  47                 }
  48         }
  49         while (isxdigit(*cp) &&
  50                (value = isdigit(*cp) ? *cp-'0' : toupper(*cp)-'A'+10) < base) {
  51                 result = result*base + value;
  52                 cp++;
  53         }
  54         if (endp)
  55                 *endp = (char *)cp;
  56         return result;
  57 }
  58
  59 EXPORT_SYMBOL(simple_strtoul);
  60
  61 /**
  62  * simple_strtol - convert a string to a signed long
  63  * @cp: The start of the string
  64  * @endp: A pointer to the end of the parsed string will be placed here
  65  * @base: The number base to use
  66  */
  67 long simple_strtol(const char *cp,char **endp,unsigned int base)
  68 {
  69         if(*cp=='-')
  70                 return -simple_strtoul(cp+1,endp,base);
  71         return simple_strtoul(cp,endp,base);
  72 }
  73
  74 EXPORT_SYMBOL(simple_strtol);
  75
  76 /**
  77  * simple_strtoull - convert a string to an unsigned long long
  78  * @cp: The start of the string
  79  * @endp: A pointer to the end of the parsed string will be placed here
  80  * @base: The number base to use
  81  */
  82 unsigned long long simple_strtoull(const char *cp,char **endp,unsigned int base)
  83 {
  84         unsigned long long result = 0,value;
  85
  86         if (!base) {
  87                 base = 10;
  88                 if (*cp == '0') {
  89                         base = 8;
  90                         cp++;
  91                         if ((*cp == 'x') && isxdigit(cp[1])) {
  92                                 cp++;
  93                                 base = 16;
  94                         }
  95                 }
  96         }
  97         while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
  98             ? toupper(*cp) : *cp)-'A'+10) < base) {
  99                 result = result*base + value;
 100                 cp++;
 101         }
 102         if (endp)
 103                 *endp = (char *)cp;
 104         return result;
 105 }
 106
 107 EXPORT_SYMBOL(simple_strtoull);
 108
 109 /**
 110  * simple_strtoll - convert a string to a signed long long
 111  * @cp: The start of the string
 112  * @endp: A pointer to the end of the parsed string will be placed here
 113  * @base: The number base to use
 114  */
 115 long long simple_strtoll(const char *cp,char **endp,unsigned int base)
 116 {
 117         if(*cp=='-')
 118                 return -simple_strtoull(cp+1,endp,base);
 119         return simple_strtoull(cp,endp,base);
 120 }
 121
 122 static int skip_atoi(const char **s)
 123 {
 124         int i=0;
 125
 126         while (isdigit(**s))
 127                 i = i*10 + *((*s)++) - '0';
 128         return i;
 129 }
 130
 131 #define ZEROPAD 1               /* pad with zero */
 132 #define SIGN    2               /* unsigned/signed long */
 133 #define PLUS    4               /* show plus */
 134 #define SPACE   8               /* space if plus */
 135 #define LEFT    16              /* left justified */
 136 #define SPECIAL 32              /* 0x */
 137 #define LARGE   64              /* use 'ABCDEF' instead of 'abcdef' */
 138
 139 static char * number(char * buf, char * end, unsigned long long num, int base, int size, int precision, int type)
 140 {
 141         char c,sign,tmp[66];
 142         const char *digits;
 143         static const char small_digits[] = "0123456789abcdefghijklmnopqrstuvwxyz";
 144         static const char large_digits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
 145         int i;
 146
 147         digits = (type & LARGE) ? large_digits : small_digits;
 148         if (type & LEFT)
 149                 type &= ~ZEROPAD;
 150         if (base < 2 || base > 36)
 151                 return 0;
 152         c = (type & ZEROPAD) ? '0' : ' ';
 153         sign = 0;
 154         if (type & SIGN) {
 155                 if ((signed long long) num < 0) {
 156                         sign = '-';
 157                         num = - (signed long long) num;
 158                         size--;
 159                 } else if (type & PLUS) {
 160                         sign = '+';
 161                         size--;
 162                 } else if (type & SPACE) {
 163                         sign = ' ';
 164                         size--;
 165                 }
 166         }
 167         if (type & SPECIAL) {
 168                 if (base == 16)
 169                         size -= 2;
 170                 else if (base == 8)
 171                         size--;
 172         }
 173         i = 0;
 174         if (num == 0)
 175                 tmp[i++]='0';
 176         else while (num != 0)
 177                 tmp[i++] = digits[do_div(num,base)];
 178         if (i > precision)
 179                 precision = i;
 180         size -= precision;
 181         if (!(type&(ZEROPAD+LEFT))) {
 182                 while(size-->0) {
 183                         if (buf <= end)
 184                                 *buf = ' ';
 185                         ++buf;
 186                 }
 187         }
 188         if (sign) {
 189                 if (buf <= end)
 190                         *buf = sign;
 191                 ++buf;
 192         }
 193         if (type & SPECIAL) {
 194                 if (base==8) {
 195                         if (buf <= end)
 196                                 *buf = '0';
 197                         ++buf;
 198                 } else if (base==16) {
 199                         if (buf <= end)
 200                                 *buf = '0';
 201                         ++buf;
 202                         if (buf <= end)
 203                                 *buf = digits[33];
 204                         ++buf;
 205                 }
 206         }
 207         if (!(type & LEFT)) {
 208                 while (size-- > 0) {
 209                         if (buf <= end)
 210                                 *buf = c;
 211                         ++buf;
 212                 }
 213         }
 214         while (i < precision--) {
 215                 if (buf <= end)
 216                         *buf = '0';
 217                 ++buf;
 218         }
 219         while (i-- > 0) {
 220                 if (buf <= end)
 221                         *buf = tmp[i];
 222                 ++buf;
 223         }
 224         while (size-- > 0) {
 225                 if (buf <= end)
 226                         *buf = ' ';
 227                 ++buf;
 228         }
 229         return buf;
 230 }
 231
 232 /**
 233  * vsnprintf - Format a string and place it in a buffer
 234  * @buf: The buffer to place the result into
 235  * @size: The size of the buffer, including the trailing null space
 236  * @fmt: The format string to use
 237  * @args: Arguments for the format string
 238  *
 239  * The return value is the number of characters which would
 240  * be generated for the given input, excluding the trailing
 241  * '\0', as per ISO C99. If you want to have the exact
 242  * number of characters written into @buf as return value
 243  * (not including the trailing '\0'), use vscnprintf. If the
 244  * return is greater than or equal to @size, the resulting
 245  * string is truncated.
 246  *
 247  * Call this function if you are already dealing with a va_list.
 248  * You probably want snprintf instead.
 249  */
 250 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
 251 {
 252         int len;
 253         unsigned long long num;
 254         int i, base;
 255         char *str, *end, c;
 256         const char *s;
 257
 258         int flags;              /* flags to number() */
 259
 260         int field_width;        /* width of output field */
 261         int precision;          /* min. # of digits for integers; max
 262                                    number of chars for from string */
 263         int qualifier;          /* 'h', 'l', or 'L' for integer fields */
 264                                 /* 'z' support added 23/7/1999 S.H.    */
 265                                 /* 'z' changed to 'Z' --davidm 1/25/99 */
 266
 267         /* Reject out-of-range values early */
 268         if (unlikely((int) size < 0)) {
 269                 /* There can be only one.. */
 270                 static int warn = 1;
 271                 WARN_ON(warn);
 272                 warn = 0;
 273                 return 0;
 274         }
 275
 276         str = buf;
 277         end = buf + size - 1;
 278
 279         if (end < buf - 1) {
 280                 end = ((void *) -1);
 281                 size = end - buf + 1;
 282         }
 283
 284         for (; *fmt ; ++fmt) {
 285                 if (*fmt != '%') {
 286                         if (str <= end)
 287                                 *str = *fmt;
 288                         ++str;
 289                         continue;
 290                 }
 291
 292                 /* process flags */
 293                 flags = 0;
 294                 repeat:
 295                         ++fmt;          /* this also skips first '%' */
 296                         switch (*fmt) {
 297                                 case '-': flags |= LEFT; goto repeat;
 298                                 case '+': flags |= PLUS; goto repeat;
 299                                 case ' ': flags |= SPACE; goto repeat;
 300                                 case '#': flags |= SPECIAL; goto repeat;
 301                                 case '0': flags |= ZEROPAD; goto repeat;
 302                         }
 303
 304                 /* get field width */
 305                 field_width = -1;
 306                 if (isdigit(*fmt))
 307                         field_width = skip_atoi(&fmt);
 308                 else if (*fmt == '*') {
 309                         ++fmt;
 310                         /* it's the next argument */
 311                         field_width = va_arg(args, int);
 312                         if (field_width < 0) {
 313                                 field_width = -field_width;
 314                                 flags |= LEFT;
 315                         }
 316                 }
 317
 318                 /* get the precision */
 319                 precision = -1;
 320                 if (*fmt == '.') {
 321                         ++fmt;
 322                         if (isdigit(*fmt))
 323                                 precision = skip_atoi(&fmt);
 324                         else if (*fmt == '*') {
 325                                 ++fmt;
 326                                 /* it's the next argument */
 327                                 precision = va_arg(args, int);
 328                         }
 329                         if (precision < 0)
 330                                 precision = 0;
 331                 }
 332
 333                 /* get the conversion qualifier */
 334                 qualifier = -1;
 335                 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
 336                     *fmt =='Z' || *fmt == 'z') {
 337                         qualifier = *fmt;
 338                         ++fmt;
 339                         if (qualifier == 'l' && *fmt == 'l') {
 340                                 qualifier = 'L';
 341                                 ++fmt;
 342                         }
 343                 }
 344
 345                 /* default base */
 346                 base = 10;
 347
 348                 switch (*fmt) {
 349                         case 'c':
 350                                 if (!(flags & LEFT)) {
 351                                         while (--field_width > 0) {
 352                                                 if (str <= end)
 353                                                         *str = ' ';
 354                                                 ++str;
 355                                         }
 356                                 }
 357                                 c = (unsigned char) va_arg(args, int);
 358                                 if (str <= end)
 359                                         *str = c;
 360                                 ++str;
 361                                 while (--field_width > 0) {
 362                                         if (str <= end)
 363                                                 *str = ' ';
 364                                         ++str;
 365                                 }
 366                                 continue;
 367
 368                         case 's':
 369                                 s = va_arg(args, char *);
 370                                 if ((unsigned long)s < PAGE_SIZE)
 371                                         s = "<NULL>";
 372
 373                                 len = strnlen(s, precision);
 374
 375                                 if (!(flags & LEFT)) {
 376                                         while (len < field_width--) {
 377                                                 if (str <= end)
 378                                                         *str = ' ';
 379                                                 ++str;
 380                                         }
 381                                 }
 382                                 for (i = 0; i < len; ++i) {
 383                                         if (str <= end)
 384                                                 *str = *s;
 385                                         ++str; ++s;
 386                                 }
 387                                 while (len < field_width--) {
 388                                         if (str <= end)
 389                                                 *str = ' ';
 390                                         ++str;
 391                                 }
 392                                 continue;
 393
 394                         case 'p':
 395                                 if (field_width == -1) {
 396                                         field_width = 2*sizeof(void *);
 397                                         flags |= ZEROPAD;
 398                                 }
 399                                 str = number(str, end,
 400                                                 (unsigned long) va_arg(args, void *),
 401                                                 16, field_width, precision, flags);
 402                                 continue;
 403
 404
 405                         case 'n':
 406                                 /* FIXME:
 407                                 * What does C99 say about the overflow case here? */
 408                                 if (qualifier == 'l') {
 409                                         long * ip = va_arg(args, long *);
 410                                         *ip = (str - buf);
 411                                 } else if (qualifier == 'Z' || qualifier == 'z') {
 412                                         size_t * ip = va_arg(args, size_t *);
 413                                         *ip = (str - buf);
 414                                 } else {
 415                                         int * ip = va_arg(args, int *);
 416                                         *ip = (str - buf);
 417                                 }
 418                                 continue;
 419
 420                         case '%':
 421                                 if (str <= end)
 422                                         *str = '%';
 423                                 ++str;
 424                                 continue;
 425
 426                                 /* integer number formats - set up the flags and "break" */
 427                         case 'o':
 428                                 base = 8;
 429                                 break;
 430
 431                         case 'X':
 432                                 flags |= LARGE;
 433                         case 'x':
 434                                 base = 16;
 435                                 break;
 436
 437                         case 'd':
 438                         case 'i':
 439                                 flags |= SIGN;
 440                         case 'u':
 441                                 break;
 442
 443                         default:
 444                                 if (str <= end)
 445                                         *str = '%';
 446                                 ++str;
 447                                 if (*fmt) {
 448                                         if (str <= end)
 449                                                 *str = *fmt;
 450                                         ++str;
 451                                 } else {
 452                                         --fmt;
 453                                 }
 454                                 continue;
 455                 }
 456                 if (qualifier == 'L')
 457                         num = va_arg(args, long long);
 458                 else if (qualifier == 'l') {
 459                         num = va_arg(args, unsigned long);
 460                         if (flags & SIGN)
 461                                 num = (signed long) num;
 462                 } else if (qualifier == 'Z' || qualifier == 'z') {
 463                         num = va_arg(args, size_t);
 464                 } else if (qualifier == 'h') {
 465                         num = (unsigned short) va_arg(args, int);
 466                         if (flags & SIGN)
 467                                 num = (signed short) num;
 468                 } else {
 469                         num = va_arg(args, unsigned int);
 470                         if (flags & SIGN)
 471                                 num = (signed int) num;
 472                 }
 473                 str = number(str, end, num, base,
 474                                 field_width, precision, flags);
 475         }
 476         if (str <= end)
 477                 *str = '\0';
 478         else if (size > 0)
 479                 /* don't write out a null byte if the buf size is zero */
 480                 *end = '\0';
 481         /* the trailing null byte doesn't count towards the total
 482         * ++str;
 483         */
 484         return str-buf;
 485 }
 486
 487 EXPORT_SYMBOL(vsnprintf);
 488
 489 /**
 490  * vscnprintf - Format a string and place it in a buffer
 491  * @buf: The buffer to place the result into
 492  * @size: The size of the buffer, including the trailing null space
 493  * @fmt: The format string to use
 494  * @args: Arguments for the format string
 495  *
 496  * The return value is the number of characters which have been written into
 497  * the @buf not including the trailing '\0'. If @size is <= 0 the function
 498  * returns 0.
 499  *
 500  * Call this function if you are already dealing with a va_list.
 501  * You probably want scnprintf instead.
 502  */
 503 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
 504 {
 505         int i;
 506
 507         i=vsnprintf(buf,size,fmt,args);
 508         return (i >= size) ? (size - 1) : i;
 509 }
 510
 511 EXPORT_SYMBOL(vscnprintf);
 512
 513 /**
 514  * snprintf - Format a string and place it in a buffer
 515  * @buf: The buffer to place the result into
 516  * @size: The size of the buffer, including the trailing null space
 517  * @fmt: The format string to use
 518  * @...: Arguments for the format string
 519  *
 520  * The return value is the number of characters which would be
 521  * generated for the given input, excluding the trailing null,
 522  * as per ISO C99.  If the return is greater than or equal to
 523  * @size, the resulting string is truncated.
 524  */
 525 int snprintf(char * buf, size_t size, const char *fmt, ...)
 526 {
 527         va_list args;
 528         int i;
 529
 530         va_start(args, fmt);
 531         i=vsnprintf(buf,size,fmt,args);
 532         va_end(args);
 533         return i;
 534 }
 535
 536 EXPORT_SYMBOL(snprintf);
 537
 538 /**
 539  * scnprintf - Format a string and place it in a buffer
 540  * @buf: The buffer to place the result into
 541  * @size: The size of the buffer, including the trailing null space
 542  * @fmt: The format string to use
 543  * @...: Arguments for the format string
 544  *
 545  * The return value is the number of characters written into @buf not including
 546  * the trailing '\0'. If @size is <= 0 the function returns 0. If the return is
 547  * greater than or equal to @size, the resulting string is truncated.
 548  */
 549
 550 int scnprintf(char * buf, size_t size, const char *fmt, ...)
 551 {
 552         va_list args;
 553         int i;
 554
 555         va_start(args, fmt);
 556         i = vsnprintf(buf, size, fmt, args);
 557         va_end(args);
 558         return (i >= size) ? (size - 1) : i;
 559 }
 560 EXPORT_SYMBOL(scnprintf);
 561
 562 /**
 563  * vsprintf - Format a string and place it in a buffer
 564  * @buf: The buffer to place the result into
 565  * @fmt: The format string to use
 566  * @args: Arguments for the format string
 567  *
 568  * The function returns the number of characters written
 569  * into @buf. Use vsnprintf or vscnprintf in order to avoid
 570  * buffer overflows.
 571  *
 572  * Call this function if you are already dealing with a va_list.
 573  * You probably want sprintf instead.
 574  */
 575 int vsprintf(char *buf, const char *fmt, va_list args)
 576 {
 577         return vsnprintf(buf, (~0U)>>1, fmt, args);
 578 }
 579
 580 EXPORT_SYMBOL(vsprintf);
 581
 582 /**
 583  * sprintf - Format a string and place it in a buffer
 584  * @buf: The buffer to place the result into
 585  * @fmt: The format string to use
 586  * @...: Arguments for the format string
 587  *
 588  * The function returns the number of characters written
 589  * into @buf. Use snprintf or scnprintf in order to avoid
 590  * buffer overflows.
 591  */
 592 int sprintf(char * buf, const char *fmt, ...)
 593 {
 594         va_list args;
 595         int i;
 596
 597         va_start(args, fmt);
 598         i=vsprintf(buf,fmt,args);
 599         va_end(args);
 600         return i;
 601 }
 602
 603 EXPORT_SYMBOL(sprintf);
 604
 605 /**
 606  * vsscanf - Unformat a buffer into a list of arguments
 607  * @buf:        input buffer
 608  * @fmt:        format of buffer
 609  * @args:       arguments
 610  */
 611 int vsscanf(const char * buf, const char * fmt, va_list args)
 612 {
 613         const char *str = buf;
 614         char *next;
 615         char digit;
 616         int num = 0;
 617         int qualifier;
 618         int base;
 619         int field_width;
 620         int is_sign = 0;
 621
 622         while(*fmt && *str) {
 623                 /* skip any white space in format */
 624                 /* white space in format matchs any amount of
 625                  * white space, including none, in the input.
 626                  */
 627                 if (isspace(*fmt)) {
 628                         while (isspace(*fmt))
 629                                 ++fmt;
 630                         while (isspace(*str))
 631                                 ++str;
 632                 }
 633
 634                 /* anything that is not a conversion must match exactly */
 635                 if (*fmt != '%' && *fmt) {
 636                         if (*fmt++ != *str++)
 637                                 break;
 638                         continue;
 639                 }
 640
 641                 if (!*fmt)
 642                         break;
 643                 ++fmt;
 644
 645                 /* skip this conversion.
 646                  * advance both strings to next white space
 647                  */
 648                 if (*fmt == '*') {
 649                         while (!isspace(*fmt) && *fmt)
 650                                 fmt++;
 651                         while (!isspace(*str) && *str)
 652                                 str++;
 653                         continue;
 654                 }
 655
 656                 /* get field width */
 657                 field_width = -1;
 658                 if (isdigit(*fmt))
 659                         field_width = skip_atoi(&fmt);
 660
 661                 /* get conversion qualifier */
 662                 qualifier = -1;
 663                 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
 664                     *fmt == 'Z' || *fmt == 'z') {
 665                         qualifier = *fmt;
 666                         fmt++;
 667                 }
 668                 base = 10;
 669                 is_sign = 0;
 670
 671                 if (!*fmt || !*str)
 672                         break;
 673
 674                 switch(*fmt++) {
 675                 case 'c':
 676                 {
 677                         char *s = (char *) va_arg(args,char*);
 678                         if (field_width == -1)
 679                                 field_width = 1;
 680                         do {
 681                                 *s++ = *str++;
 682                         } while (--field_width > 0 && *str);
 683                         num++;
 684                 }
 685                 continue;
 686                 case 's':
 687                 {
 688                         char *s = (char *) va_arg(args, char *);
 689                         if(field_width == -1)
 690                                 field_width = INT_MAX;
 691                         /* first, skip leading white space in buffer */
 692                         while (isspace(*str))
 693                                 str++;
 694
 695                         /* now copy until next white space */
 696                         while (*str && !isspace(*str) && field_width--) {
 697                                 *s++ = *str++;
 698                         }
 699                         *s = '\0';
 700                         num++;
 701                 }
 702                 continue;
 703                 case 'n':
 704                         /* return number of characters read so far */
 705                 {
 706                         int *i = (int *)va_arg(args,int*);
 707                         *i = str - buf;
 708                 }
 709                 continue;
 710                 case 'o':
 711                         base = 8;
 712                         break;
 713                 case 'x':
 714                 case 'X':
 715                         base = 16;
 716                         break;
 717                 case 'i':
 718                         base = 0;
 719                 case 'd':
 720                         is_sign = 1;
 721                 case 'u':
 722                         break;
 723                 case '%':
 724                         /* looking for '%' in str */
 725                         if (*str++ != '%')
 726                                 return num;
 727                         continue;
 728                 default:
 729                         /* invalid format; stop here */
 730                         return num;
 731                 }
 732
 733                 /* have some sort of integer conversion.
 734                  * first, skip white space in buffer.
 735                  */
 736                 while (isspace(*str))
 737                         str++;
 738
 739                 digit = *str;
 740                 if (is_sign && digit == '-')
 741                         digit = *(str + 1);
 742
 743                 if (!digit
 744                     || (base == 16 && !isxdigit(digit))
 745                     || (base == 10 && !isdigit(digit))
 746                     || (base == 8 && (!isdigit(digit) || digit > '7'))
 747                     || (base == 0 && !isdigit(digit)))
 748                                 break;
 749
 750                 switch(qualifier) {
 751                 case 'h':
 752                         if (is_sign) {
 753                                 short *s = (short *) va_arg(args,short *);
 754                                 *s = (short) simple_strtol(str,&next,base);
 755                         } else {
 756                                 unsigned short *s = (unsigned short *) va_arg(args, unsigned short *);
 757                                 *s = (unsigned short) simple_strtoul(str, &next, base);
 758                         }
 759                         break;
 760                 case 'l':
 761                         if (is_sign) {
 762                                 long *l = (long *) va_arg(args,long *);
 763                                 *l = simple_strtol(str,&next,base);
 764                         } else {
 765                                 unsigned long *l = (unsigned long*) va_arg(args,unsigned long*);
 766                                 *l = simple_strtoul(str,&next,base);
 767                         }
 768                         break;
 769                 case 'L':
 770                         if (is_sign) {
 771                                 long long *l = (long long*) va_arg(args,long long *);
 772                                 *l = simple_strtoll(str,&next,base);
 773                         } else {
 774                                 unsigned long long *l = (unsigned long long*) va_arg(args,unsigned long long*);
 775                                 *l = simple_strtoull(str,&next,base);
 776                         }
 777                         break;
 778                 case 'Z':
 779                 case 'z':
 780                 {
 781                         size_t *s = (size_t*) va_arg(args,size_t*);
 782                         *s = (size_t) simple_strtoul(str,&next,base);
 783                 }
 784                 break;
 785                 default:
 786                         if (is_sign) {
 787                                 int *i = (int *) va_arg(args, int*);
 788                                 *i = (int) simple_strtol(str,&next,base);
 789                         } else {
 790                                 unsigned int *i = (unsigned int*) va_arg(args, unsigned int*);
 791                                 *i = (unsigned int) simple_strtoul(str,&next,base);
 792                         }
 793                         break;
 794                 }
 795                 num++;
 796
 797                 if (!next)
 798                         break;
 799                 str = next;
 800         }
 801         return num;
 802 }
 803
 804 EXPORT_SYMBOL(vsscanf);
 805
 806 /**
 807  * sscanf - Unformat a buffer into a list of arguments
 808  * @buf:        input buffer
 809  * @fmt:        formatting of buffer
 810  * @...:        resulting arguments
 811  */
 812 int sscanf(const char * buf, const char * fmt, ...)
 813 {
 814         va_list args;
 815         int i;
 816
 817         va_start(args,fmt);
 818         i = vsscanf(buf,fmt,args);
 819         va_end(args);
 820         return i;
 821 }
 822
 823 EXPORT_SYMBOL(sscanf);