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/page.h>           /* for PAGE_SIZE */
  27 #include <asm/div64.h>
  28
  29 /**
  30  * simple_strtoul - convert a string to an unsigned long
  31  * @cp: The start of the string
  32  * @endp: A pointer to the end of the parsed string will be placed here
  33  * @base: The number base to use
  34  */
  35 unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base)
  36 {
  37         unsigned long result = 0,value;
  38
  39         if (!base) {
  40                 base = 10;
  41                 if (*cp == '0') {
  42                         base = 8;
  43                         cp++;
  44                         if ((toupper(*cp) == 'X') && isxdigit(cp[1])) {
  45                                 cp++;
  46                                 base = 16;
  47                         }
  48                 }
  49         } else if (base == 16) {
  50                 if (cp[0] == '0' && toupper(cp[1]) == 'X')
  51                         cp += 2;
  52         }
  53         while (isxdigit(*cp) &&
  54                (value = isdigit(*cp) ? *cp-'0' : toupper(*cp)-'A'+10) < base) {
  55                 result = result*base + value;
  56                 cp++;
  57         }
  58         if (endp)
  59                 *endp = (char *)cp;
  60         return result;
  61 }
  62
  63 EXPORT_SYMBOL(simple_strtoul);
  64
  65 /**
  66  * simple_strtol - convert a string to a signed long
  67  * @cp: The start of the string
  68  * @endp: A pointer to the end of the parsed string will be placed here
  69  * @base: The number base to use
  70  */
  71 long simple_strtol(const char *cp,char **endp,unsigned int base)
  72 {
  73         if(*cp=='-')
  74                 return -simple_strtoul(cp+1,endp,base);
  75         return simple_strtoul(cp,endp,base);
  76 }
  77
  78 EXPORT_SYMBOL(simple_strtol);
  79
  80 /**
  81  * simple_strtoull - convert a string to an unsigned long long
  82  * @cp: The start of the string
  83  * @endp: A pointer to the end of the parsed string will be placed here
  84  * @base: The number base to use
  85  */
  86 unsigned long long simple_strtoull(const char *cp,char **endp,unsigned int base)
  87 {
  88         unsigned long long result = 0,value;
  89
  90         if (!base) {
  91                 base = 10;
  92                 if (*cp == '0') {
  93                         base = 8;
  94                         cp++;
  95                         if ((toupper(*cp) == 'X') && isxdigit(cp[1])) {
  96                                 cp++;
  97                                 base = 16;
  98                         }
  99                 }
 100         } else if (base == 16) {
 101                 if (cp[0] == '0' && toupper(cp[1]) == 'X')
 102                         cp += 2;
 103         }
 104         while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
 105             ? toupper(*cp) : *cp)-'A'+10) < base) {
 106                 result = result*base + value;
 107                 cp++;
 108         }
 109         if (endp)
 110                 *endp = (char *)cp;
 111         return result;
 112 }
 113
 114 EXPORT_SYMBOL(simple_strtoull);
 115
 116 /**
 117  * simple_strtoll - convert a string to a signed long long
 118  * @cp: The start of the string
 119  * @endp: A pointer to the end of the parsed string will be placed here
 120  * @base: The number base to use
 121  */
 122 long long simple_strtoll(const char *cp,char **endp,unsigned int base)
 123 {
 124         if(*cp=='-')
 125                 return -simple_strtoull(cp+1,endp,base);
 126         return simple_strtoull(cp,endp,base);
 127 }
 128
 129 static int skip_atoi(const char **s)
 130 {
 131         int i=0;
 132
 133         while (isdigit(**s))
 134                 i = i*10 + *((*s)++) - '0';
 135         return i;
 136 }
 137
 138 #define ZEROPAD 1               /* pad with zero */
 139 #define SIGN    2               /* unsigned/signed long */
 140 #define PLUS    4               /* show plus */
 141 #define SPACE   8               /* space if plus */
 142 #define LEFT    16              /* left justified */
 143 #define SPECIAL 32              /* 0x */
 144 #define LARGE   64              /* use 'ABCDEF' instead of 'abcdef' */
 145
 146 static char * number(char * buf, char * end, unsigned long long num, int base, int size, int precision, int type)
 147 {
 148         char c,sign,tmp[66];
 149         const char *digits;
 150         static const char small_digits[] = "0123456789abcdefghijklmnopqrstuvwxyz";
 151         static const char large_digits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
 152         int i;
 153
 154         digits = (type & LARGE) ? large_digits : small_digits;
 155         if (type & LEFT)
 156                 type &= ~ZEROPAD;
 157         if (base < 2 || base > 36)
 158                 return NULL;
 159         c = (type & ZEROPAD) ? '0' : ' ';
 160         sign = 0;
 161         if (type & SIGN) {
 162                 if ((signed long long) num < 0) {
 163                         sign = '-';
 164                         num = - (signed long long) num;
 165                         size--;
 166                 } else if (type & PLUS) {
 167                         sign = '+';
 168                         size--;
 169                 } else if (type & SPACE) {
 170                         sign = ' ';
 171                         size--;
 172                 }
 173         }
 174         if (type & SPECIAL) {
 175                 if (base == 16)
 176                         size -= 2;
 177                 else if (base == 8)
 178                         size--;
 179         }
 180         i = 0;
 181         if (num == 0)
 182                 tmp[i++]='0';
 183         else while (num != 0)
 184                 tmp[i++] = digits[do_div(num,base)];
 185         if (i > precision)
 186                 precision = i;
 187         size -= precision;
 188         if (!(type&(ZEROPAD+LEFT))) {
 189                 while(size-->0) {
 190                         if (buf < end)
 191                                 *buf = ' ';
 192                         ++buf;
 193                 }
 194         }
 195         if (sign) {
 196                 if (buf < end)
 197                         *buf = sign;
 198                 ++buf;
 199         }
 200         if (type & SPECIAL) {
 201                 if (base==8) {
 202                         if (buf < end)
 203                                 *buf = '0';
 204                         ++buf;
 205                 } else if (base==16) {
 206                         if (buf < end)
 207                                 *buf = '0';
 208                         ++buf;
 209                         if (buf < end)
 210                                 *buf = digits[33];
 211                         ++buf;
 212                 }
 213         }
 214         if (!(type & LEFT)) {
 215                 while (size-- > 0) {
 216                         if (buf < end)
 217                                 *buf = c;
 218                         ++buf;
 219                 }
 220         }
 221         while (i < precision--) {
 222                 if (buf < end)
 223                         *buf = '0';
 224                 ++buf;
 225         }
 226         while (i-- > 0) {
 227                 if (buf < end)
 228                         *buf = tmp[i];
 229                 ++buf;
 230         }
 231         while (size-- > 0) {
 232                 if (buf < end)
 233                         *buf = ' ';
 234                 ++buf;
 235         }
 236         return buf;
 237 }
 238
 239 /**
 240  * vsnprintf - Format a string and place it in a buffer
 241  * @buf: The buffer to place the result into
 242  * @size: The size of the buffer, including the trailing null space
 243  * @fmt: The format string to use
 244  * @args: Arguments for the format string
 245  *
 246  * The return value is the number of characters which would
 247  * be generated for the given input, excluding the trailing
 248  * '\0', as per ISO C99. If you want to have the exact
 249  * number of characters written into @buf as return value
 250  * (not including the trailing '\0'), use vscnprintf(). If the
 251  * return is greater than or equal to @size, the resulting
 252  * string is truncated.
 253  *
 254  * Call this function if you are already dealing with a va_list.
 255  * You probably want snprintf() instead.
 256  */
 257 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
 258 {
 259         int len;
 260         unsigned long long num;
 261         int i, base;
 262         char *str, *end, c;
 263         const char *s;
 264
 265         int flags;              /* flags to number() */
 266
 267         int field_width;        /* width of output field */
 268         int precision;          /* min. # of digits for integers; max
 269                                    number of chars for from string */
 270         int qualifier;          /* 'h', 'l', or 'L' for integer fields */
 271                                 /* 'z' support added 23/7/1999 S.H.    */
 272                                 /* 'z' changed to 'Z' --davidm 1/25/99 */
 273                                 /* 't' added for ptrdiff_t */
 274
 275         /* Reject out-of-range values early.  Large positive sizes are
 276            used for unknown buffer sizes. */
 277         if (unlikely((int) size < 0)) {
 278                 /* There can be only one.. */
 279                 static int warn = 1;
 280                 WARN_ON(warn);
 281                 warn = 0;
 282                 return 0;
 283         }
 284
 285         str = buf;
 286         end = buf + size;
 287
 288         /* Make sure end is always >= buf */
 289         if (end < buf) {
 290                 end = ((void *)-1);
 291                 size = end - buf;
 292         }
 293
 294         for (; *fmt ; ++fmt) {
 295                 if (*fmt != '%') {
 296                         if (str < end)
 297                                 *str = *fmt;
 298                         ++str;
 299                         continue;
 300                 }
 301
 302                 /* process flags */
 303                 flags = 0;
 304                 repeat:
 305                         ++fmt;          /* this also skips first '%' */
 306                         switch (*fmt) {
 307                                 case '-': flags |= LEFT; goto repeat;
 308                                 case '+': flags |= PLUS; goto repeat;
 309                                 case ' ': flags |= SPACE; goto repeat;
 310                                 case '#': flags |= SPECIAL; goto repeat;
 311                                 case '0': flags |= ZEROPAD; goto repeat;
 312                         }
 313
 314                 /* get field width */
 315                 field_width = -1;
 316                 if (isdigit(*fmt))
 317                         field_width = skip_atoi(&fmt);
 318                 else if (*fmt == '*') {
 319                         ++fmt;
 320                         /* it's the next argument */
 321                         field_width = va_arg(args, int);
 322                         if (field_width < 0) {
 323                                 field_width = -field_width;
 324                                 flags |= LEFT;
 325                         }
 326                 }
 327
 328                 /* get the precision */
 329                 precision = -1;
 330                 if (*fmt == '.') {
 331                         ++fmt;
 332                         if (isdigit(*fmt))
 333                                 precision = skip_atoi(&fmt);
 334                         else if (*fmt == '*') {
 335                                 ++fmt;
 336                                 /* it's the next argument */
 337                                 precision = va_arg(args, int);
 338                         }
 339                         if (precision < 0)
 340                                 precision = 0;
 341                 }
 342
 343                 /* get the conversion qualifier */
 344                 qualifier = -1;
 345                 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
 346                     *fmt =='Z' || *fmt == 'z' || *fmt == 't') {
 347                         qualifier = *fmt;
 348                         ++fmt;
 349                         if (qualifier == 'l' && *fmt == 'l') {
 350                                 qualifier = 'L';
 351                                 ++fmt;
 352                         }
 353                 }
 354
 355                 /* default base */
 356                 base = 10;
 357
 358                 switch (*fmt) {
 359                         case 'c':
 360                                 if (!(flags & LEFT)) {
 361                                         while (--field_width > 0) {
 362                                                 if (str < end)
 363                                                         *str = ' ';
 364                                                 ++str;
 365                                         }
 366                                 }
 367                                 c = (unsigned char) va_arg(args, int);
 368                                 if (str < end)
 369                                         *str = c;
 370                                 ++str;
 371                                 while (--field_width > 0) {
 372                                         if (str < end)
 373                                                 *str = ' ';
 374                                         ++str;
 375                                 }
 376                                 continue;
 377
 378                         case 's':
 379                                 s = va_arg(args, char *);
 380                                 if ((unsigned long)s < PAGE_SIZE)
 381                                         s = "<NULL>";
 382
 383                                 len = strnlen(s, precision);
 384
 385                                 if (!(flags & LEFT)) {
 386                                         while (len < field_width--) {
 387                                                 if (str < end)
 388                                                         *str = ' ';
 389                                                 ++str;
 390                                         }
 391                                 }
 392                                 for (i = 0; i < len; ++i) {
 393                                         if (str < end)
 394                                                 *str = *s;
 395                                         ++str; ++s;
 396                                 }
 397                                 while (len < field_width--) {
 398                                         if (str < end)
 399                                                 *str = ' ';
 400                                         ++str;
 401                                 }
 402                                 continue;
 403
 404                         case 'p':
 405                                 if (field_width == -1) {
 406                                         field_width = 2*sizeof(void *);
 407                                         flags |= ZEROPAD;
 408                                 }
 409                                 str = number(str, end,
 410                                                 (unsigned long) va_arg(args, void *),
 411                                                 16, field_width, precision, flags);
 412                                 continue;
 413
 414
 415                         case 'n':
 416                                 /* FIXME:
 417                                 * What does C99 say about the overflow case here? */
 418                                 if (qualifier == 'l') {
 419                                         long * ip = va_arg(args, long *);
 420                                         *ip = (str - buf);
 421                                 } else if (qualifier == 'Z' || qualifier == 'z') {
 422                                         size_t * ip = va_arg(args, size_t *);
 423                                         *ip = (str - buf);
 424                                 } else {
 425                                         int * ip = va_arg(args, int *);
 426                                         *ip = (str - buf);
 427                                 }
 428                                 continue;
 429
 430                         case '%':
 431                                 if (str < end)
 432                                         *str = '%';
 433                                 ++str;
 434                                 continue;
 435
 436                                 /* integer number formats - set up the flags and "break" */
 437                         case 'o':
 438                                 base = 8;
 439                                 break;
 440
 441                         case 'X':
 442                                 flags |= LARGE;
 443                         case 'x':
 444                                 base = 16;
 445                                 break;
 446
 447                         case 'd':
 448                         case 'i':
 449                                 flags |= SIGN;
 450                         case 'u':
 451                                 break;
 452
 453                         default:
 454                                 if (str < end)
 455                                         *str = '%';
 456                                 ++str;
 457                                 if (*fmt) {
 458                                         if (str < end)
 459                                                 *str = *fmt;
 460                                         ++str;
 461                                 } else {
 462                                         --fmt;
 463                                 }
 464                                 continue;
 465                 }
 466                 if (qualifier == 'L')
 467                         num = va_arg(args, long long);
 468                 else if (qualifier == 'l') {
 469                         num = va_arg(args, unsigned long);
 470                         if (flags & SIGN)
 471                                 num = (signed long) num;
 472                 } else if (qualifier == 'Z' || qualifier == 'z') {
 473                         num = va_arg(args, size_t);
 474                 } else if (qualifier == 't') {
 475                         num = va_arg(args, ptrdiff_t);
 476                 } else if (qualifier == 'h') {
 477                         num = (unsigned short) va_arg(args, int);
 478                         if (flags & SIGN)
 479                                 num = (signed short) num;
 480                 } else {
 481                         num = va_arg(args, unsigned int);
 482                         if (flags & SIGN)
 483                                 num = (signed int) num;
 484                 }
 485                 str = number(str, end, num, base,
 486                                 field_width, precision, flags);
 487         }
 488         if (size > 0) {
 489                 if (str < end)
 490                         *str = '\0';
 491                 else
 492                         end[-1] = '\0';
 493         }
 494         /* the trailing null byte doesn't count towards the total */
 495         return str-buf;
 496 }
 497
 498 EXPORT_SYMBOL(vsnprintf);
 499
 500 /**
 501  * vscnprintf - Format a string and place it in a buffer
 502  * @buf: The buffer to place the result into
 503  * @size: The size of the buffer, including the trailing null space
 504  * @fmt: The format string to use
 505  * @args: Arguments for the format string
 506  *
 507  * The return value is the number of characters which have been written into
 508  * the @buf not including the trailing '\0'. If @size is <= 0 the function
 509  * returns 0.
 510  *
 511  * Call this function if you are already dealing with a va_list.
 512  * You probably want scnprintf() instead.
 513  */
 514 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
 515 {
 516         int i;
 517
 518         i=vsnprintf(buf,size,fmt,args);
 519         return (i >= size) ? (size - 1) : i;
 520 }
 521
 522 EXPORT_SYMBOL(vscnprintf);
 523
 524 /**
 525  * snprintf - Format a string and place it in a buffer
 526  * @buf: The buffer to place the result into
 527  * @size: The size of the buffer, including the trailing null space
 528  * @fmt: The format string to use
 529  * @...: Arguments for the format string
 530  *
 531  * The return value is the number of characters which would be
 532  * generated for the given input, excluding the trailing null,
 533  * as per ISO C99.  If the return is greater than or equal to
 534  * @size, the resulting string is truncated.
 535  */
 536 int snprintf(char * buf, size_t size, const char *fmt, ...)
 537 {
 538         va_list args;
 539         int i;
 540
 541         va_start(args, fmt);
 542         i=vsnprintf(buf,size,fmt,args);
 543         va_end(args);
 544         return i;
 545 }
 546
 547 EXPORT_SYMBOL(snprintf);
 548
 549 /**
 550  * scnprintf - Format a string and place it in a buffer
 551  * @buf: The buffer to place the result into
 552  * @size: The size of the buffer, including the trailing null space
 553  * @fmt: The format string to use
 554  * @...: Arguments for the format string
 555  *
 556  * The return value is the number of characters written into @buf not including
 557  * the trailing '\0'. If @size is <= 0 the function returns 0.
 558  */
 559
 560 int scnprintf(char * buf, size_t size, const char *fmt, ...)
 561 {
 562         va_list args;
 563         int i;
 564
 565         va_start(args, fmt);
 566         i = vsnprintf(buf, size, fmt, args);
 567         va_end(args);
 568         return (i >= size) ? (size - 1) : i;
 569 }
 570 EXPORT_SYMBOL(scnprintf);
 571
 572 /**
 573  * vsprintf - Format a string and place it in a buffer
 574  * @buf: The buffer to place the result into
 575  * @fmt: The format string to use
 576  * @args: Arguments for the format string
 577  *
 578  * The function returns the number of characters written
 579  * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
 580  * buffer overflows.
 581  *
 582  * Call this function if you are already dealing with a va_list.
 583  * You probably want sprintf() instead.
 584  */
 585 int vsprintf(char *buf, const char *fmt, va_list args)
 586 {
 587         return vsnprintf(buf, INT_MAX, fmt, args);
 588 }
 589
 590 EXPORT_SYMBOL(vsprintf);
 591
 592 /**
 593  * sprintf - Format a string and place it in a buffer
 594  * @buf: The buffer to place the result into
 595  * @fmt: The format string to use
 596  * @...: Arguments for the format string
 597  *
 598  * The function returns the number of characters written
 599  * into @buf. Use snprintf() or scnprintf() in order to avoid
 600  * buffer overflows.
 601  */
 602 int sprintf(char * buf, const char *fmt, ...)
 603 {
 604         va_list args;
 605         int i;
 606
 607         va_start(args, fmt);
 608         i=vsnprintf(buf, INT_MAX, fmt, args);
 609         va_end(args);
 610         return i;
 611 }
 612
 613 EXPORT_SYMBOL(sprintf);
 614
 615 /**
 616  * vsscanf - Unformat a buffer into a list of arguments
 617  * @buf:        input buffer
 618  * @fmt:        format of buffer
 619  * @args:       arguments
 620  */
 621 int vsscanf(const char * buf, const char * fmt, va_list args)
 622 {
 623         const char *str = buf;
 624         char *next;
 625         char digit;
 626         int num = 0;
 627         int qualifier;
 628         int base;
 629         int field_width;
 630         int is_sign = 0;
 631
 632         while(*fmt && *str) {
 633                 /* skip any white space in format */
 634                 /* white space in format matchs any amount of
 635                  * white space, including none, in the input.
 636                  */
 637                 if (isspace(*fmt)) {
 638                         while (isspace(*fmt))
 639                                 ++fmt;
 640                         while (isspace(*str))
 641                                 ++str;
 642                 }
 643
 644                 /* anything that is not a conversion must match exactly */
 645                 if (*fmt != '%' && *fmt) {
 646                         if (*fmt++ != *str++)
 647                                 break;
 648                         continue;
 649                 }
 650
 651                 if (!*fmt)
 652                         break;
 653                 ++fmt;
 654
 655                 /* skip this conversion.
 656                  * advance both strings to next white space
 657                  */
 658                 if (*fmt == '*') {
 659                         while (!isspace(*fmt) && *fmt)
 660                                 fmt++;
 661                         while (!isspace(*str) && *str)
 662                                 str++;
 663                         continue;
 664                 }
 665
 666                 /* get field width */
 667                 field_width = -1;
 668                 if (isdigit(*fmt))
 669                         field_width = skip_atoi(&fmt);
 670
 671                 /* get conversion qualifier */
 672                 qualifier = -1;
 673                 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
 674                     *fmt == 'Z' || *fmt == 'z') {
 675                         qualifier = *fmt++;
 676                         if (unlikely(qualifier == *fmt)) {
 677                                 if (qualifier == 'h') {
 678                                         qualifier = 'H';
 679                                         fmt++;
 680                                 } else if (qualifier == 'l') {
 681                                         qualifier = 'L';
 682                                         fmt++;
 683                                 }
 684                         }
 685                 }
 686                 base = 10;
 687                 is_sign = 0;
 688
 689                 if (!*fmt || !*str)
 690                         break;
 691
 692                 switch(*fmt++) {
 693                 case 'c':
 694                 {
 695                         char *s = (char *) va_arg(args,char*);
 696                         if (field_width == -1)
 697                                 field_width = 1;
 698                         do {
 699                                 *s++ = *str++;
 700                         } while (--field_width > 0 && *str);
 701                         num++;
 702                 }
 703                 continue;
 704                 case 's':
 705                 {
 706                         char *s = (char *) va_arg(args, char *);
 707                         if(field_width == -1)
 708                                 field_width = INT_MAX;
 709                         /* first, skip leading white space in buffer */
 710                         while (isspace(*str))
 711                                 str++;
 712
 713                         /* now copy until next white space */
 714                         while (*str && !isspace(*str) && field_width--) {
 715                                 *s++ = *str++;
 716                         }
 717                         *s = '\0';
 718                         num++;
 719                 }
 720                 continue;
 721                 case 'n':
 722                         /* return number of characters read so far */
 723                 {
 724                         int *i = (int *)va_arg(args,int*);
 725                         *i = str - buf;
 726                 }
 727                 continue;
 728                 case 'o':
 729                         base = 8;
 730                         break;
 731                 case 'x':
 732                 case 'X':
 733                         base = 16;
 734                         break;
 735                 case 'i':
 736                         base = 0;
 737                 case 'd':
 738                         is_sign = 1;
 739                 case 'u':
 740                         break;
 741                 case '%':
 742                         /* looking for '%' in str */
 743                         if (*str++ != '%')
 744                                 return num;
 745                         continue;
 746                 default:
 747                         /* invalid format; stop here */
 748                         return num;
 749                 }
 750
 751                 /* have some sort of integer conversion.
 752                  * first, skip white space in buffer.
 753                  */
 754                 while (isspace(*str))
 755                         str++;
 756
 757                 digit = *str;
 758                 if (is_sign && digit == '-')
 759                         digit = *(str + 1);
 760
 761                 if (!digit
 762                     || (base == 16 && !isxdigit(digit))
 763                     || (base == 10 && !isdigit(digit))
 764                     || (base == 8 && (!isdigit(digit) || digit > '7'))
 765                     || (base == 0 && !isdigit(digit)))
 766                                 break;
 767
 768                 switch(qualifier) {
 769                 case 'H':       /* that's 'hh' in format */
 770                         if (is_sign) {
 771                                 signed char *s = (signed char *) va_arg(args,signed char *);
 772                                 *s = (signed char) simple_strtol(str,&next,base);
 773                         } else {
 774                                 unsigned char *s = (unsigned char *) va_arg(args, unsigned char *);
 775                                 *s = (unsigned char) simple_strtoul(str, &next, base);
 776                         }
 777                         break;
 778                 case 'h':
 779                         if (is_sign) {
 780                                 short *s = (short *) va_arg(args,short *);
 781                                 *s = (short) simple_strtol(str,&next,base);
 782                         } else {
 783                                 unsigned short *s = (unsigned short *) va_arg(args, unsigned short *);
 784                                 *s = (unsigned short) simple_strtoul(str, &next, base);
 785                         }
 786                         break;
 787                 case 'l':
 788                         if (is_sign) {
 789                                 long *l = (long *) va_arg(args,long *);
 790                                 *l = simple_strtol(str,&next,base);
 791                         } else {
 792                                 unsigned long *l = (unsigned long*) va_arg(args,unsigned long*);
 793                                 *l = simple_strtoul(str,&next,base);
 794                         }
 795                         break;
 796                 case 'L':
 797                         if (is_sign) {
 798                                 long long *l = (long long*) va_arg(args,long long *);
 799                                 *l = simple_strtoll(str,&next,base);
 800                         } else {
 801                                 unsigned long long *l = (unsigned long long*) va_arg(args,unsigned long long*);
 802                                 *l = simple_strtoull(str,&next,base);
 803                         }
 804                         break;
 805                 case 'Z':
 806                 case 'z':
 807                 {
 808                         size_t *s = (size_t*) va_arg(args,size_t*);
 809                         *s = (size_t) simple_strtoul(str,&next,base);
 810                 }
 811                 break;
 812                 default:
 813                         if (is_sign) {
 814                                 int *i = (int *) va_arg(args, int*);
 815                                 *i = (int) simple_strtol(str,&next,base);
 816                         } else {
 817                                 unsigned int *i = (unsigned int*) va_arg(args, unsigned int*);
 818                                 *i = (unsigned int) simple_strtoul(str,&next,base);
 819                         }
 820                         break;
 821                 }
 822                 num++;
 823
 824                 if (!next)
 825                         break;
 826                 str = next;
 827         }
 828
 829         /*
 830          * Now we've come all the way through so either the input string or the
 831          * format ended. In the former case, there can be a %n at the current
 832          * position in the format that needs to be filled.
 833          */
 834         if (*fmt == '%' && *(fmt + 1) == 'n') {
 835                 int *p = (int *)va_arg(args, int *);
 836                 *p = str - buf;
 837         }
 838
 839         return num;
 840 }
 841
 842 EXPORT_SYMBOL(vsscanf);
 843
 844 /**
 845  * sscanf - Unformat a buffer into a list of arguments
 846  * @buf:        input buffer
 847  * @fmt:        formatting of buffer
 848  * @...:        resulting arguments
 849  */
 850 int sscanf(const char * buf, const char * fmt, ...)
 851 {
 852         va_list args;
 853         int i;
 854
 855         va_start(args,fmt);
 856         i = vsscanf(buf,fmt,args);
 857         va_end(args);
 858         return i;
 859 }
 860
 861 EXPORT_SYMBOL(sscanf);
 862
 863
 864 /* Simplified asprintf. */
 865 char *kvasprintf(gfp_t gfp, const char *fmt, va_list ap)
 866 {
 867         unsigned int len;
 868         char *p;
 869         va_list aq;
 870
 871         va_copy(aq, ap);
 872         len = vsnprintf(NULL, 0, fmt, aq);
 873         va_end(aq);
 874
 875         p = kmalloc(len+1, gfp);
 876         if (!p)
 877                 return NULL;
 878
 879         vsnprintf(p, len+1, fmt, ap);
 880
 881         return p;
 882 }
 883 EXPORT_SYMBOL(kvasprintf);
 884
 885 char *kasprintf(gfp_t gfp, const char *fmt, ...)
 886 {
 887         va_list ap;
 888         char *p;
 889
 890         va_start(ap, fmt);
 891         p = kvasprintf(gfp, fmt, ap);
 892         va_end(ap);
 893
 894         return p;
 895 }
 896 EXPORT_SYMBOL(kasprintf);