91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
/* xtom -- convert a hexadecimal string to a MINT, and return a pointer to
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the MINT.
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Copyright 1991, 1994, 1995, 1996, 2000, 2001, 2002, 2005 Free Software
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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 "mp.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 __gmp_digit_value_tab
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MINT *
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xtom (const char *str)
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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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MINT *x = (MINT *) (*__gmp_allocate_func) (sizeof (MINT));
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TMP_DECL;
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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] >= 16)
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return 0; /* error if no digits */
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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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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 >= 16)
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{
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TMP_FREE;
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return 0;
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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 = str_size / __mp_bases[16].chars_per_limb + 1;
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x->_mp_alloc = xsize;
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x->_mp_d = (mp_ptr) (*__gmp_allocate_func) (xsize * BYTES_PER_MP_LIMB);
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xsize = mpn_set_str (x->_mp_d, (unsigned char *) begs, str_size, 16);
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x->_mp_size = negative ? -xsize : xsize;
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TMP_FREE;
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return x;
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}
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