139 lines
3.1 KiB
C
139 lines
3.1 KiB
C
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/* mpz_inp_str(dest_integer, stream, base) -- Input a number in base
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BASE from stdio stream STREAM and store the result in DEST_INTEGER.
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Copyright (C) 1991, 1993, 1994, 1996 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Library General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
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License for more details.
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You should have received a copy of the GNU Library General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA. */
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#include <stdio.h>
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#include <ctype.h>
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#include "gmp.h"
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#include "gmp-impl.h"
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static int
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digit_value_in_base (c, base)
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int c;
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int base;
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{
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int digit;
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if (isdigit (c))
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digit = c - '0';
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else if (islower (c))
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digit = c - 'a' + 10;
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else if (isupper (c))
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digit = c - 'A' + 10;
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else
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return -1;
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if (digit < base)
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return digit;
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return -1;
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}
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size_t
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#if __STDC__
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mpz_inp_str (mpz_ptr dest, FILE *stream, int base)
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#else
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mpz_inp_str (dest, stream, base)
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mpz_ptr dest;
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FILE *stream;
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int base;
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#endif
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{
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char *str;
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size_t alloc_size, str_size;
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int c;
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int negative;
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mp_size_t dest_size;
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size_t nread;
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if (stream == 0)
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stream = stdin;
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alloc_size = 100;
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str = (char *) (*_mp_allocate_func) (alloc_size);
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str_size = 0;
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nread = 0;
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/* Skip whitespace. */
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do
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{
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c = getc (stream);
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nread++;
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}
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while (isspace (c));
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negative = 0;
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if (c == '-')
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{
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negative = 1;
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c = getc (stream);
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}
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if (digit_value_in_base (c, base == 0 ? 10 : base) < 0)
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return 0; /* error if no digits */
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/* If BASE is 0, try to find out the base by looking at the initial
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characters. */
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if (base == 0)
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{
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base = 10;
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if (c == '0')
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{
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base = 8;
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c = getc (stream);
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nread++;
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if (c == 'x' || c == 'X')
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{
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base = 16;
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c = getc (stream);
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nread++;
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}
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}
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}
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for (;;)
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{
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int dig;
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if (str_size >= alloc_size)
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{
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size_t old_alloc_size = alloc_size;
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alloc_size = alloc_size * 3 / 2;
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str = (char *) (*_mp_reallocate_func) (str, old_alloc_size, alloc_size);
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}
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dig = digit_value_in_base (c, base);
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if (dig < 0)
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break;
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str[str_size++] = dig;
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c = getc (stream);
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}
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ungetc (c, stream);
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dest_size = str_size / __mp_bases[base].chars_per_limb + 1;
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if (dest->_mp_alloc < dest_size)
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_mpz_realloc (dest, dest_size);
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dest_size = mpn_set_str (dest->_mp_d, (unsigned char *) str, str_size, base);
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dest->_mp_size = negative ? -dest_size : dest_size;
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(*_mp_free_func) (str, alloc_size);
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return str_size + nread;
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}
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