133 lines
2.9 KiB
C
133 lines
2.9 KiB
C
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/* mpz_set_str(mp_dest, string, base) -- Convert the \0-terminated
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string STRING in base BASE to multiple precision integer in
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MP_DEST. Allow white space in the string. If BASE == 0 determine
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the base in the C standard way, i.e. 0xhh...h means base 16,
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0oo...o means base 8, otherwise assume base 10.
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Copyright (C) 1991, 1993, 1994, 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 <ctype.h>
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#include "gmp.h"
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#include "gmp-impl.h"
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#include "longlong.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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int
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#if __STDC__
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mpz_set_str (mpz_ptr x, const char *str, int base)
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#else
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mpz_set_str (x, str, base)
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mpz_ptr x;
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const char *str;
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int base;
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#endif
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{
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size_t str_size;
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char *s, *begs;
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size_t i;
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mp_size_t xsize;
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int c;
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int negative;
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TMP_DECL (marker);
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/* Skip whitespace. */
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do
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c = *str++;
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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 = *str++;
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}
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if (digit_value_in_base (c, base == 0 ? 10 : base) < 0)
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return -1; /* 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 = *str++;
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if (c == 'x' || c == 'X')
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{
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base = 16;
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c = *str++;
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}
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}
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}
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TMP_MARK (marker);
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str_size = strlen (str - 1);
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s = begs = (char *) TMP_ALLOC (str_size + 1);
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for (i = 0; i < str_size; i++)
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{
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if (!isspace (c))
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{
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int dig = digit_value_in_base (c, base);
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if (dig < 0)
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{
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TMP_FREE (marker);
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return -1;
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}
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*s++ = dig;
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}
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c = *str++;
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}
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str_size = s - begs;
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xsize = str_size / __mp_bases[base].chars_per_limb + 1;
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if (x->_mp_alloc < xsize)
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_mpz_realloc (x, xsize);
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xsize = mpn_set_str (x->_mp_d, (unsigned char *) begs, str_size, base);
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x->_mp_size = negative ? -xsize : xsize;
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TMP_FREE (marker);
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return 0;
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}
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