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Annotation of OpenXM_contrib/gmp/mpbsd/xtom.c, Revision 1.1

1.1     ! maekawa     1: /* xtom -- convert a hexadecimal string to a MINT, and return a pointer to
        !             2:    the MINT.
        !             3:
        !             4: Copyright (C) 1991, 1994, 1995 Free Software Foundation, Inc.
        !             5:
        !             6: This file is part of the GNU MP Library.
        !             7:
        !             8: The GNU MP Library is free software; you can redistribute it and/or modify
        !             9: it under the terms of the GNU Library General Public License as published by
        !            10: the Free Software Foundation; either version 2 of the License, or (at your
        !            11: option) any later version.
        !            12:
        !            13: The GNU MP Library is distributed in the hope that it will be useful, but
        !            14: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            15: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
        !            16: License for more details.
        !            17:
        !            18: You should have received a copy of the GNU Library General Public License
        !            19: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            20: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            21: MA 02111-1307, USA. */
        !            22:
        !            23: #include "mp.h"
        !            24: #include "gmp.h"
        !            25: #include "gmp-impl.h"
        !            26:
        !            27: static int
        !            28: digit_value_in_base (c, base)
        !            29:      int c;
        !            30:      int base;
        !            31: {
        !            32:   int digit;
        !            33:
        !            34:   if (isdigit (c))
        !            35:     digit = c - '0';
        !            36:   else if (islower (c))
        !            37:     digit = c - 'a' + 10;
        !            38:   else if (isupper (c))
        !            39:     digit = c - 'A' + 10;
        !            40:   else
        !            41:     return -1;
        !            42:
        !            43:   if (digit < base)
        !            44:     return digit;
        !            45:   return -1;
        !            46: }
        !            47:
        !            48: MINT *
        !            49: #if __STDC__
        !            50: xtom (const char *str)
        !            51: #else
        !            52: xtom (str)
        !            53:      const char *str;
        !            54: #endif
        !            55: {
        !            56:   size_t str_size;
        !            57:   char *s, *begs;
        !            58:   size_t i;
        !            59:   mp_size_t xsize;
        !            60:   int c;
        !            61:   int negative;
        !            62:   MINT *x = (MINT *) (*_mp_allocate_func) (sizeof (MINT));
        !            63:   TMP_DECL (marker);
        !            64:
        !            65:   /* Skip whitespace.  */
        !            66:   do
        !            67:     c = *str++;
        !            68:   while (isspace (c));
        !            69:
        !            70:   negative = 0;
        !            71:   if (c == '-')
        !            72:     {
        !            73:       negative = 1;
        !            74:       c = *str++;
        !            75:     }
        !            76:
        !            77:   if (digit_value_in_base (c, 16) < 0)
        !            78:     return 0;                  /* error if no digits */
        !            79:
        !            80:   TMP_MARK (marker);
        !            81:   str_size = strlen (str - 1);
        !            82:   s = begs = (char *) TMP_ALLOC (str_size + 1);
        !            83:
        !            84:   for (i = 0; i < str_size; i++)
        !            85:     {
        !            86:       if (!isspace (c))
        !            87:        {
        !            88:          int dig = digit_value_in_base (c, 16);
        !            89:          if (dig < 0)
        !            90:            {
        !            91:              TMP_FREE (marker);
        !            92:              return 0;
        !            93:            }
        !            94:          *s++ = dig;
        !            95:        }
        !            96:       c = *str++;
        !            97:     }
        !            98:
        !            99:   str_size = s - begs;
        !           100:
        !           101:   xsize = str_size / __mp_bases[16].chars_per_limb + 1;
        !           102:   x->_mp_alloc = xsize;
        !           103:   x->_mp_d = (mp_ptr) (*_mp_allocate_func) (xsize * BYTES_PER_MP_LIMB);
        !           104:
        !           105:   xsize = mpn_set_str (x->_mp_d, (unsigned char *) begs, str_size, 16);
        !           106:   x->_mp_size = negative ? -xsize : xsize;
        !           107:
        !           108:   TMP_FREE (marker);
        !           109:   return x;
        !           110: }