106 lines
2.3 KiB
C
106 lines
2.3 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 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 General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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The GNU MP Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with the GNU MP Library; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, 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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char_ok_for_base (c, base)
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int c;
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int base;
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{
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if (isdigit (c))
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return (unsigned) c - '0' < base;
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if (islower (c))
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return (unsigned) c - 'a' + 10 < base;
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if (isupper (c))
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return (unsigned) c - 'A' + 10 < base;
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return 0;
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}
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void
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#ifdef __STDC__
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mpz_inp_str (MP_INT *dest, FILE *stream, int base)
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#else
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mpz_inp_str (dest, stream, base)
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MP_INT *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 str_size;
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size_t i;
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int c;
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int negative = 0;
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str_size = 100;
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str = (char *) (*_mp_allocate_func) (str_size);
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c = getc (stream);
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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 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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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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}
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}
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}
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for (i = 0; char_ok_for_base (c, base); i++)
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{
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if (i >= str_size)
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{
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size_t old_str_size = str_size;
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str_size = str_size * 3 / 2;
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str = (char *) (*_mp_reallocate_func) (str, old_str_size, str_size);
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}
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str[i] = c;
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c = getc (stream);
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}
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ungetc (c, stream);
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str[i] = 0;
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_mpz_set_str (dest, str, base);
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if (negative)
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dest->size = -dest->size;
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(*_mp_free_func) (str, str_size);
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}
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