external/gpl2/xcvs/dist/lib/strtol.c

   1 /* Convert string representation of a number into an integer value.
   2
   3    Copyright (C) 1991, 1992, 1994, 1995, 1996, 1997, 1998, 1999, 2003, 2005
   4    Free Software Foundation, Inc.
   5
   6    NOTE: The canonical source of this file is maintained with the GNU C
   7    Library.  Bugs can be reported to bug-glibc@gnu.org.
   8
   9    This program is free software; you can redistribute it and/or modify it
  10    under the terms of the GNU General Public License as published by the
  11    Free Software Foundation; either version 2, or (at your option) any
  12    later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software Foundation,
  21    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  22
  23 #ifdef HAVE_CONFIG_H
  24 # include <config.h>
  25 #endif
  26
  27 #ifdef _LIBC
  28 # define USE_NUMBER_GROUPING
  29 #endif
  30
  31 #include <ctype.h>
  32 #include <errno.h>
  33 #ifndef errno
  34 extern int errno;
  35 #endif
  36 #ifndef __set_errno
  37 # define __set_errno(Val) errno = (Val)
  38 #endif
  39
  40 #include <limits.h>
  41 #include <stddef.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44
  45 #ifdef USE_NUMBER_GROUPING
  46 # include "../locale/localeinfo.h"
  47 #endif
  48
  49 /* Nonzero if we are defining `strtoul' or `strtoull', operating on
  50    unsigned integers.  */
  51 #ifndef UNSIGNED
  52 # define UNSIGNED 0
  53 # define INT LONG int
  54 #else
  55 # define INT unsigned LONG int
  56 #endif
  57
  58 /* Determine the name.  */
  59 #ifdef USE_IN_EXTENDED_LOCALE_MODEL
  60 # if UNSIGNED
  61 #  ifdef USE_WIDE_CHAR
  62 #   ifdef QUAD
  63 #    define strtol __wcstoull_l
  64 #   else
  65 #    define strtol __wcstoul_l
  66 #   endif
  67 #  else
  68 #   ifdef QUAD
  69 #    define strtol __strtoull_l
  70 #   else
  71 #    define strtol __strtoul_l
  72 #   endif
  73 #  endif
  74 # else
  75 #  ifdef USE_WIDE_CHAR
  76 #   ifdef QUAD
  77 #    define strtol __wcstoll_l
  78 #   else
  79 #    define strtol __wcstol_l
  80 #   endif
  81 #  else
  82 #   ifdef QUAD
  83 #    define strtol __strtoll_l
  84 #   else
  85 #    define strtol __strtol_l
  86 #   endif
  87 #  endif
  88 # endif
  89 #else
  90 # if UNSIGNED
  91 #  ifdef USE_WIDE_CHAR
  92 #   ifdef QUAD
  93 #    define strtol wcstoull
  94 #   else
  95 #    define strtol wcstoul
  96 #   endif
  97 #  else
  98 #   ifdef QUAD
  99 #    define strtol strtoull
 100 #   else
 101 #    define strtol strtoul
 102 #   endif
 103 #  endif
 104 # else
 105 #  ifdef USE_WIDE_CHAR
 106 #   ifdef QUAD
 107 #    define strtol wcstoll
 108 #   else
 109 #    define strtol wcstol
 110 #   endif
 111 #  else
 112 #   ifdef QUAD
 113 #    define strtol strtoll
 114 #   endif
 115 #  endif
 116 # endif
 117 #endif
 118
 119 /* If QUAD is defined, we are defining `strtoll' or `strtoull',
 120    operating on `long long int's.  */
 121 #ifdef QUAD
 122 # define LONG long long
 123 # define STRTOL_LONG_MIN LONG_LONG_MIN
 124 # define STRTOL_LONG_MAX LONG_LONG_MAX
 125 # define STRTOL_ULONG_MAX ULONG_LONG_MAX
 126
 127 /* The extra casts in the following macros work around compiler bugs,
 128    e.g., in Cray C 5.0.3.0.  */
 129
 130 /* True if negative values of the signed integer type T use two's
 131    complement, ones' complement, or signed magnitude representation,
 132    respectively.  Much GNU code assumes two's complement, but some
 133    people like to be portable to all possible C hosts.  */
 134 # define TYPE_TWOS_COMPLEMENT(t) ((t) ~ (t) 0 == (t) -1)
 135 # define TYPE_ONES_COMPLEMENT(t) ((t) ~ (t) 0 == 0)
 136 # define TYPE_SIGNED_MAGNITUDE(t) ((t) ~ (t) 0 < (t) -1)
 137
 138 /* True if the arithmetic type T is signed.  */
 139 # define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
 140
 141 /* The maximum and minimum values for the integer type T.  These
 142    macros have undefined behavior if T is signed and has padding bits.
 143    If this is a problem for you, please let us know how to fix it for
 144    your host.  */
 145 # define TYPE_MINIMUM(t) \
 146    ((t) (! TYPE_SIGNED (t) \
 147          ? (t) 0 \
 148          : TYPE_SIGNED_MAGNITUDE (t) \
 149          ? ~ (t) 0 \
 150          : ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1)))
 151 # define TYPE_MAXIMUM(t) \
 152    ((t) (! TYPE_SIGNED (t) \
 153          ? (t) -1 \
 154          : ~ (~ (t) 0 << (sizeof (t) * CHAR_BIT - 1))))
 155
 156 # ifndef ULONG_LONG_MAX
 157 #  define ULONG_LONG_MAX TYPE_MAXIMUM (unsigned long long)
 158 # endif
 159 # ifndef LONG_LONG_MAX
 160 #  define LONG_LONG_MAX TYPE_MAXIMUM (long long int)
 161 # endif
 162 # ifndef LONG_LONG_MIN
 163 #  define LONG_LONG_MIN TYPE_MINIMUM (long long int)
 164 # endif
 165
 166 # if __GNUC__ == 2 && __GNUC_MINOR__ < 7
 167    /* Work around gcc bug with using this constant.  */
 168    static const unsigned long long int maxquad = ULONG_LONG_MAX;
 169 #  undef STRTOL_ULONG_MAX
 170 #  define STRTOL_ULONG_MAX maxquad
 171 # endif
 172 #else
 173 # define LONG long
 174 # define STRTOL_LONG_MIN LONG_MIN
 175 # define STRTOL_LONG_MAX LONG_MAX
 176 # define STRTOL_ULONG_MAX ULONG_MAX
 177 #endif
 178
 179
 180 /* We use this code also for the extended locale handling where the
 181    function gets as an additional argument the locale which has to be
 182    used.  To access the values we have to redefine the _NL_CURRENT
 183    macro.  */
 184 #ifdef USE_IN_EXTENDED_LOCALE_MODEL
 185 # undef _NL_CURRENT
 186 # define _NL_CURRENT(category, item) \
 187   (current->values[_NL_ITEM_INDEX (item)].string)
 188 # define LOCALE_PARAM , loc
 189 # define LOCALE_PARAM_PROTO , __locale_t loc
 190 #else
 191 # define LOCALE_PARAM
 192 # define LOCALE_PARAM_PROTO
 193 #endif
 194
 195 #if defined _LIBC || defined HAVE_WCHAR_H
 196 # include <wchar.h>
 197 #endif
 198
 199 #ifdef USE_WIDE_CHAR
 200 # include <wctype.h>
 201 # define L_(Ch) L##Ch
 202 # define UCHAR_TYPE wint_t
 203 # define STRING_TYPE wchar_t
 204 # ifdef USE_IN_EXTENDED_LOCALE_MODEL
 205 #  define ISSPACE(Ch) __iswspace_l ((Ch), loc)
 206 #  define ISALPHA(Ch) __iswalpha_l ((Ch), loc)
 207 #  define TOUPPER(Ch) __towupper_l ((Ch), loc)
 208 # else
 209 #  define ISSPACE(Ch) iswspace (Ch)
 210 #  define ISALPHA(Ch) iswalpha (Ch)
 211 #  define TOUPPER(Ch) towupper (Ch)
 212 # endif
 213 #else
 214 # if defined STDC_HEADERS || (!defined isascii && !defined HAVE_ISASCII)
 215 #  define IN_CTYPE_DOMAIN(c) 1
 216 # else
 217 #  define IN_CTYPE_DOMAIN(c) isascii(c)
 218 # endif
 219 # define L_(Ch) Ch
 220 # define UCHAR_TYPE unsigned char
 221 # define STRING_TYPE char
 222 # ifdef USE_IN_EXTENDED_LOCALE_MODEL
 223 #  define ISSPACE(Ch) __isspace_l ((Ch), loc)
 224 #  define ISALPHA(Ch) __isalpha_l ((Ch), loc)
 225 #  define TOUPPER(Ch) __toupper_l ((Ch), loc)
 226 # else
 227 #  define ISSPACE(Ch) (IN_CTYPE_DOMAIN (Ch) && isspace (Ch))
 228 #  define ISALPHA(Ch) (IN_CTYPE_DOMAIN (Ch) && isalpha (Ch))
 229 #  define TOUPPER(Ch) (IN_CTYPE_DOMAIN (Ch) ? toupper (Ch) : (Ch))
 230 # endif
 231 #endif
 232
 233 #define INTERNAL(X) INTERNAL1(X)
 234 #define INTERNAL1(X) __##X##_internal
 235 #define WEAKNAME(X) WEAKNAME1(X)
 236
 237 #ifdef USE_NUMBER_GROUPING
 238 /* This file defines a function to check for correct grouping.  */
 239 # include "grouping.h"
 240 #endif
 241
 242
 243
 244 /* Convert NPTR to an `unsigned long int' or `long int' in base BASE.
 245    If BASE is 0 the base is determined by the presence of a leading
 246    zero, indicating octal or a leading "0x" or "0X", indicating hexadecimal.
 247    If BASE is < 2 or > 36, it is reset to 10.
 248    If ENDPTR is not NULL, a pointer to the character after the last
 249    one converted is stored in *ENDPTR.  */
 250
 251 INT
 252 INTERNAL (strtol) (const STRING_TYPE *nptr, STRING_TYPE **endptr,
 253                    int base, int group LOCALE_PARAM_PROTO)
 254 {
 255   int negative;
 256   register unsigned LONG int cutoff;
 257   register unsigned int cutlim;
 258   register unsigned LONG int i;
 259   register const STRING_TYPE *s;
 260   register UCHAR_TYPE c;
 261   const STRING_TYPE *save, *end;
 262   int overflow;
 263
 264 #ifdef USE_NUMBER_GROUPING
 265 # ifdef USE_IN_EXTENDED_LOCALE_MODEL
 266   struct locale_data *current = loc->__locales[LC_NUMERIC];
 267 # endif
 268   /* The thousands character of the current locale.  */
 269   wchar_t thousands = L'\0';
 270   /* The numeric grouping specification of the current locale,
 271      in the format described in <locale.h>.  */
 272   const char *grouping;
 273
 274   if (group)
 275     {
 276       grouping = _NL_CURRENT (LC_NUMERIC, GROUPING);
 277       if (*grouping <= 0 || *grouping == CHAR_MAX)
 278         grouping = NULL;
 279       else
 280         {
 281           /* Figure out the thousands separator character.  */
 282 # if defined _LIBC || defined _HAVE_BTOWC
 283           thousands = __btowc (*_NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP));
 284           if (thousands == WEOF)
 285             thousands = L'\0';
 286 # endif
 287           if (thousands == L'\0')
 288             grouping = NULL;
 289         }
 290     }
 291   else
 292     grouping = NULL;
 293 #endif
 294
 295   if (base < 0 || base == 1 || base > 36)
 296     {
 297       __set_errno (EINVAL);
 298       return 0;
 299     }
 300
 301   save = s = nptr;
 302
 303   /* Skip white space.  */
 304   while (ISSPACE (*s))
 305     ++s;
 306   if (*s == L_('\0'))
 307     goto noconv;
 308
 309   /* Check for a sign.  */
 310   if (*s == L_('-'))
 311     {
 312       negative = 1;
 313       ++s;
 314     }
 315   else if (*s == L_('+'))
 316     {
 317       negative = 0;
 318       ++s;
 319     }
 320   else
 321     negative = 0;
 322
 323   /* Recognize number prefix and if BASE is zero, figure it out ourselves.  */
 324   if (*s == L_('0'))
 325     {
 326       if ((base == 0 || base == 16) && TOUPPER (s[1]) == L_('X'))
 327         {
 328           s += 2;
 329           base = 16;
 330         }
 331       else if (base == 0)
 332         base = 8;
 333     }
 334   else if (base == 0)
 335     base = 10;
 336
 337   /* Save the pointer so we can check later if anything happened.  */
 338   save = s;
 339
 340 #ifdef USE_NUMBER_GROUPING
 341   if (group)
 342     {
 343       /* Find the end of the digit string and check its grouping.  */
 344       end = s;
 345       for (c = *end; c != L_('\0'); c = *++end)
 346         if ((wchar_t) c != thousands
 347             && ((wchar_t) c < L_('0') || (wchar_t) c > L_('9'))
 348             && (!ISALPHA (c) || (int) (TOUPPER (c) - L_('A') + 10) >= base))
 349           break;
 350       if (*s == thousands)
 351         end = s;
 352       else
 353         end = correctly_grouped_prefix (s, end, thousands, grouping);
 354     }
 355   else
 356 #endif
 357     end = NULL;
 358
 359   cutoff = STRTOL_ULONG_MAX / (unsigned LONG int) base;
 360   cutlim = STRTOL_ULONG_MAX % (unsigned LONG int) base;
 361
 362   overflow = 0;
 363   i = 0;
 364   for (c = *s; c != L_('\0'); c = *++s)
 365     {
 366       if (s == end)
 367         break;
 368       if (c >= L_('0') && c <= L_('9'))
 369         c -= L_('0');
 370       else if (ISALPHA (c))
 371         c = TOUPPER (c) - L_('A') + 10;
 372       else
 373         break;
 374       if ((int) c >= base)
 375         break;
 376       /* Check for overflow.  */
 377       if (i > cutoff || (i == cutoff && c > cutlim))
 378         overflow = 1;
 379       else
 380         {
 381           i *= (unsigned LONG int) base;
 382           i += c;
 383         }
 384     }
 385
 386   /* Check if anything actually happened.  */
 387   if (s == save)
 388     goto noconv;
 389
 390   /* Store in ENDPTR the address of one character
 391      past the last character we converted.  */
 392   if (endptr != NULL)
 393     *endptr = (STRING_TYPE *) s;
 394
 395 #if !UNSIGNED
 396   /* Check for a value that is within the range of
 397      `unsigned LONG int', but outside the range of `LONG int'.  */
 398   if (overflow == 0
 399       && i > (negative
 400               ? -((unsigned LONG int) (STRTOL_LONG_MIN + 1)) + 1
 401               : (unsigned LONG int) STRTOL_LONG_MAX))
 402     overflow = 1;
 403 #endif
 404
 405   if (overflow)
 406     {
 407       __set_errno (ERANGE);
 408 #if UNSIGNED
 409       return STRTOL_ULONG_MAX;
 410 #else
 411       return negative ? STRTOL_LONG_MIN : STRTOL_LONG_MAX;
 412 #endif
 413     }
 414
 415   /* Return the result of the appropriate sign.  */
 416   return negative ? -i : i;
 417
 418 noconv:
 419   /* We must handle a special case here: the base is 0 or 16 and the
 420      first two characters are '0' and 'x', but the rest are no
 421      hexadecimal digits.  This is no error case.  We return 0 and
 422      ENDPTR points to the `x`.  */
 423   if (endptr != NULL)
 424     {
 425       if (save - nptr >= 2 && TOUPPER (save[-1]) == L_('X')
 426           && save[-2] == L_('0'))
 427         *endptr = (STRING_TYPE *) &save[-1];
 428       else
 429         /*  There was no number to convert.  */
 430         *endptr = (STRING_TYPE *) nptr;
 431     }
 432
 433   return 0L;
 434 }
 435 \f
 436 /* External user entry point.  */
 437
 438
 439 INT
 440 #ifdef weak_function
 441 weak_function
 442 #endif
 443 strtol (const STRING_TYPE *nptr, STRING_TYPE **endptr,
 444         int base LOCALE_PARAM_PROTO)
 445 {
 446   return INTERNAL (strtol) (nptr, endptr, base, 0 LOCALE_PARAM);
 447 }