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Annotation of OpenXM_contrib/gmp/mpz/inp_str.c, Revision 1.1

1.1     ! maekawa     1: /* mpz_inp_str(dest_integer, stream, base) -- Input a number in base
        !             2:    BASE from stdio stream STREAM and store the result in DEST_INTEGER.
        !             3:
        !             4: Copyright (C) 1991, 1993, 1994, 1996 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 <stdio.h>
        !            24: #include <ctype.h>
        !            25: #include "gmp.h"
        !            26: #include "gmp-impl.h"
        !            27:
        !            28: static int
        !            29: digit_value_in_base (c, base)
        !            30:      int c;
        !            31:      int base;
        !            32: {
        !            33:   int digit;
        !            34:
        !            35:   if (isdigit (c))
        !            36:     digit = c - '0';
        !            37:   else if (islower (c))
        !            38:     digit = c - 'a' + 10;
        !            39:   else if (isupper (c))
        !            40:     digit = c - 'A' + 10;
        !            41:   else
        !            42:     return -1;
        !            43:
        !            44:   if (digit < base)
        !            45:     return digit;
        !            46:   return -1;
        !            47: }
        !            48:
        !            49: size_t
        !            50: #if __STDC__
        !            51: mpz_inp_str (mpz_ptr dest, FILE *stream, int base)
        !            52: #else
        !            53: mpz_inp_str (dest, stream, base)
        !            54:      mpz_ptr dest;
        !            55:      FILE *stream;
        !            56:      int base;
        !            57: #endif
        !            58: {
        !            59:   char *str;
        !            60:   size_t alloc_size, str_size;
        !            61:   int c;
        !            62:   int negative;
        !            63:   mp_size_t dest_size;
        !            64:   size_t nread;
        !            65:
        !            66:   if (stream == 0)
        !            67:     stream = stdin;
        !            68:
        !            69:   alloc_size = 100;
        !            70:   str = (char *) (*_mp_allocate_func) (alloc_size);
        !            71:   str_size = 0;
        !            72:   nread = 0;
        !            73:
        !            74:   /* Skip whitespace.  */
        !            75:   do
        !            76:     {
        !            77:       c = getc (stream);
        !            78:       nread++;
        !            79:     }
        !            80:   while (isspace (c));
        !            81:
        !            82:   negative = 0;
        !            83:   if (c == '-')
        !            84:     {
        !            85:       negative = 1;
        !            86:       c = getc (stream);
        !            87:     }
        !            88:
        !            89:   if (digit_value_in_base (c, base == 0 ? 10 : base) < 0)
        !            90:     return 0;                  /* error if no digits */
        !            91:
        !            92:   /* If BASE is 0, try to find out the base by looking at the initial
        !            93:      characters.  */
        !            94:   if (base == 0)
        !            95:     {
        !            96:       base = 10;
        !            97:       if (c == '0')
        !            98:        {
        !            99:          base = 8;
        !           100:          c = getc (stream);
        !           101:          nread++;
        !           102:          if (c == 'x' || c == 'X')
        !           103:            {
        !           104:              base = 16;
        !           105:              c = getc (stream);
        !           106:              nread++;
        !           107:            }
        !           108:        }
        !           109:     }
        !           110:
        !           111:   for (;;)
        !           112:     {
        !           113:       int dig;
        !           114:       if (str_size >= alloc_size)
        !           115:        {
        !           116:          size_t old_alloc_size = alloc_size;
        !           117:          alloc_size = alloc_size * 3 / 2;
        !           118:          str = (char *) (*_mp_reallocate_func) (str, old_alloc_size, alloc_size);
        !           119:        }
        !           120:       dig = digit_value_in_base (c, base);
        !           121:       if (dig < 0)
        !           122:        break;
        !           123:       str[str_size++] = dig;
        !           124:       c = getc (stream);
        !           125:     }
        !           126:
        !           127:   ungetc (c, stream);
        !           128:
        !           129:   dest_size = str_size / __mp_bases[base].chars_per_limb + 1;
        !           130:   if (dest->_mp_alloc < dest_size)
        !           131:     _mpz_realloc (dest, dest_size);
        !           132:
        !           133:   dest_size = mpn_set_str (dest->_mp_d, (unsigned char *) str, str_size, base);
        !           134:   dest->_mp_size = negative ? -dest_size : dest_size;
        !           135:
        !           136:   (*_mp_free_func) (str, alloc_size);
        !           137:   return str_size + nread;
        !           138: }