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Annotation of OpenXM_contrib/gmp/mpz/inp_str.c, Revision 1.1.1.1

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: }