106 lines
2.3 KiB
C
106 lines
2.3 KiB
C
/* mpz_inp_str(dest_integer, stream, base) -- Input a number in base
|
|
BASE from stdio stream STREAM and store the result in DEST_INTEGER.
|
|
|
|
Copyright (C) 1991, 1993 Free Software Foundation, Inc.
|
|
|
|
This file is part of the GNU MP Library.
|
|
|
|
The GNU MP Library is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
The GNU MP Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with the GNU MP Library; see the file COPYING. If not, write to
|
|
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
|
|
|
|
#include <stdio.h>
|
|
#include <ctype.h>
|
|
#include "gmp.h"
|
|
#include "gmp-impl.h"
|
|
|
|
static int
|
|
char_ok_for_base (c, base)
|
|
int c;
|
|
int base;
|
|
{
|
|
if (isdigit (c))
|
|
return (unsigned) c - '0' < base;
|
|
if (islower (c))
|
|
return (unsigned) c - 'a' + 10 < base;
|
|
if (isupper (c))
|
|
return (unsigned) c - 'A' + 10 < base;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
#ifdef __STDC__
|
|
mpz_inp_str (MP_INT *dest, FILE *stream, int base)
|
|
#else
|
|
mpz_inp_str (dest, stream, base)
|
|
MP_INT *dest;
|
|
FILE *stream;
|
|
int base;
|
|
#endif
|
|
{
|
|
char *str;
|
|
size_t str_size;
|
|
size_t i;
|
|
int c;
|
|
int negative = 0;
|
|
|
|
str_size = 100;
|
|
str = (char *) (*_mp_allocate_func) (str_size);
|
|
|
|
c = getc (stream);
|
|
if (c == '-')
|
|
{
|
|
negative = 1;
|
|
c = getc (stream);
|
|
}
|
|
|
|
/* If BASE is 0, try to find out the base by looking at the initial
|
|
characters. */
|
|
if (base == 0)
|
|
{
|
|
base = 10;
|
|
if (c == '0')
|
|
{
|
|
base = 8;
|
|
c = getc (stream);
|
|
if (c == 'x' || c == 'X')
|
|
{
|
|
base = 16;
|
|
c = getc (stream);
|
|
}
|
|
}
|
|
}
|
|
|
|
for (i = 0; char_ok_for_base (c, base); i++)
|
|
{
|
|
if (i >= str_size)
|
|
{
|
|
size_t old_str_size = str_size;
|
|
str_size = str_size * 3 / 2;
|
|
str = (char *) (*_mp_reallocate_func) (str, old_str_size, str_size);
|
|
}
|
|
str[i] = c;
|
|
c = getc (stream);
|
|
}
|
|
|
|
ungetc (c, stream);
|
|
|
|
str[i] = 0;
|
|
_mpz_set_str (dest, str, base);
|
|
if (negative)
|
|
dest->size = -dest->size;
|
|
|
|
(*_mp_free_func) (str, str_size);
|
|
}
|