138 lines
3.6 KiB
C
138 lines
3.6 KiB
C
/* 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 1991, 1993, 1994, 1996, 1997, 1998, 2000, 2001, 2002, 2003, 2005
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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 Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 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 Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser 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., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include <string.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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extern const unsigned char __gmp_digit_value_tab[];
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#define digit_value_tab __gmp_digit_value_tab
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int
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mpz_set_str (mpz_ptr x, const char *str, int base)
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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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const unsigned char *digit_value;
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TMP_DECL;
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digit_value = digit_value_tab;
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if (base > 36)
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{
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/* For bases > 36, use the collating sequence
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0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz. */
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digit_value += 224;
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if (base > 62)
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return -1; /* too large base */
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}
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/* Skip whitespace. */
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do
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c = (unsigned char) *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 = (unsigned char) *str++;
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}
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if (digit_value[c] >= (base == 0 ? 10 : base))
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return -1; /* error if no valid 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 = (unsigned char) *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 = (unsigned char) *str++;
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}
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else if (c == 'b' || c == 'B')
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{
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base = 2;
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c = (unsigned char) *str++;
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}
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}
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}
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/* Skip leading zeros and white space. */
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while (c == '0' || isspace (c))
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c = (unsigned char) *str++;
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/* Make sure the string does not become empty, mpn_set_str would fail. */
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if (c == 0)
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{
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x->_mp_size = 0;
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return 0;
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}
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TMP_MARK;
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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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/* Remove spaces from the string and convert the result from ASCII to a
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byte array. */
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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[c];
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if (dig >= base)
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{
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TMP_FREE;
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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 = (unsigned char) *str++;
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}
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str_size = s - begs;
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xsize = (((mp_size_t) (str_size / __mp_bases[base].chars_per_bit_exactly))
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/ GMP_NUMB_BITS + 2);
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MPZ_REALLOC (x, xsize);
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/* Convert the byte array in base BASE to our bignum format. */
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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;
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return 0;
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}
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