6ec01646dc
BMakefiles and other bits will follow. Requested by: Andrey Chernov Made world by: Chuck Robey
303 lines
6.3 KiB
C
303 lines
6.3 KiB
C
/* mpf_set_str (dest, string, base) -- Convert the string STRING
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in base BASE to a float in dest. If BASE is zero, the leading characters
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of STRING is used to figure out the base.
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Copyright (C) 1993, 1994, 1995, 1996 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 <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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#include "longlong.h"
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long int strtol _PROTO ((const char *, char **ptr, int));
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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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mpf_set_str (mpf_ptr x, const char *str, int base)
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#else
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mpf_set_str (x, str, base)
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mpf_ptr x;
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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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char *dotpos = 0;
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int expflag;
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int decimal_exponent_flag;
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TMP_DECL (marker);
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TMP_MARK (marker);
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c = *str;
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/* Skip whitespace. */
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while (isspace (c))
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c = *++str;
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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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decimal_exponent_flag = base < 0;
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base = ABS (base);
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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 0
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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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base = 16;
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}
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#endif
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}
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expflag = 0;
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str_size = strlen (str);
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for (i = 0; i < str_size; i++)
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{
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c = str[i];
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if (c == '@' || (base <= 10 && (c == 'e' || c == 'E')))
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{
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expflag = 1;
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str_size = i;
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break;
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}
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}
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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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c = *str;
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if (!isspace (c))
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{
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int dig;
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if (c == '.')
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{
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if (dotpos != 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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dotpos = s;
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}
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else
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{
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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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}
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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 + 2;
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{
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long exp_in_base;
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mp_size_t rsize, msize;
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int cnt, i;
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mp_ptr mp, xp, tp, rp;
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mp_limb_t cy;
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mp_exp_t exp_in_limbs;
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mp_size_t prec = x->_mp_prec;
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int divflag;
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mp_size_t xxx = 0;
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mp = (mp_ptr) TMP_ALLOC (xsize * BYTES_PER_MP_LIMB);
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msize = mpn_set_str (mp, (unsigned char *) begs, str_size, base);
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if (msize == 0)
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{
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x->_mp_size = 0;
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x->_mp_exp = 0;
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TMP_FREE (marker);
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return 0;
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}
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if (expflag != 0)
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exp_in_base = strtol (str + 1, (char **) 0,
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decimal_exponent_flag ? 10 : base);
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else
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exp_in_base = 0;
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if (dotpos != 0)
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exp_in_base -= s - dotpos;
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divflag = exp_in_base < 0;
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exp_in_base = ABS (exp_in_base);
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if (exp_in_base == 0)
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{
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MPN_COPY (x->_mp_d, mp, msize);
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x->_mp_size = negative ? -msize : msize;
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x->_mp_exp = msize;
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TMP_FREE (marker);
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return 0;
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}
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#if 1
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rsize = (((mp_size_t) (exp_in_base / __mp_bases[base].chars_per_bit_exactly))
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/ BITS_PER_MP_LIMB + 3);
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#else
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count_leading_zeros (cnt, (mp_limb_t) base);
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rsize = exp_in_base - cnt * exp_in_base / BITS_PER_MP_LIMB + 1;
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#endif
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rp = (mp_ptr) TMP_ALLOC (rsize * BYTES_PER_MP_LIMB);
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tp = (mp_ptr) TMP_ALLOC (rsize * BYTES_PER_MP_LIMB);
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rp[0] = base;
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rsize = 1;
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count_leading_zeros (cnt, exp_in_base);
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for (i = BITS_PER_MP_LIMB - cnt - 2; i >= 0; i--)
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{
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mpn_mul_n (tp, rp, rp, rsize);
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rsize = 2 * rsize;
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rsize -= tp[rsize - 1] == 0;
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xp = tp; tp = rp; rp = xp;
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if (((exp_in_base >> i) & 1) != 0)
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{
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cy = mpn_mul_1 (rp, rp, rsize, (mp_limb_t) base);
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rp[rsize] = cy;
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rsize += cy != 0;
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}
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}
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if (rsize > prec)
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{
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xxx += rsize - prec;
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rp += rsize - prec;
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rsize = prec;
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}
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#if 0
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if (msize > prec)
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{
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xxx -= msize - prec;
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mp += msize - prec;
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msize = prec;
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}
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#endif
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if (divflag)
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{
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mp_ptr qp;
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mp_limb_t qflag;
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mp_size_t xtra;
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if (msize <= rsize)
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{
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/* Allocate extra limb for current divrem sematics. */
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mp_ptr tmp = (mp_ptr) TMP_ALLOC ((rsize + 1) * BYTES_PER_MP_LIMB);
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MPN_ZERO (tmp, rsize - msize);
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MPN_COPY (tmp + rsize - msize, mp, msize);
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mp = tmp;
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xxx += rsize - msize;
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msize = rsize;
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}
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count_leading_zeros (cnt, rp[rsize - 1]);
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if (cnt != 0)
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{
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mpn_lshift (rp, rp, rsize, cnt);
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cy = mpn_lshift (mp, mp, msize, cnt);
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if (cy)
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mp[msize++] = cy;
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}
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qp = (mp_ptr) TMP_ALLOC ((prec + 1) * BYTES_PER_MP_LIMB);
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xtra = prec - (msize - rsize);
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qflag = mpn_divrem (qp, xtra, mp, msize, rp, rsize);
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qp[prec] = qflag;
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tp = qp;
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rsize = prec + qflag;
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exp_in_limbs = rsize - xtra - xxx;
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}
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else
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{
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tp = (mp_ptr) TMP_ALLOC ((rsize + msize) * BYTES_PER_MP_LIMB);
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if (rsize > msize)
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mpn_mul (tp, rp, rsize, mp, msize);
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else
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mpn_mul (tp, mp, msize, rp, rsize);
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rsize += msize;
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rsize -= tp[rsize - 1] == 0;
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exp_in_limbs = rsize + xxx;
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if (rsize > prec)
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{
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xxx = rsize - prec;
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tp += rsize - prec;
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rsize = prec;
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exp_in_limbs += 0;
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}
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}
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MPN_COPY (x->_mp_d, tp, rsize);
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x->_mp_size = negative ? -rsize : rsize;
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x->_mp_exp = exp_in_limbs;
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TMP_FREE (marker);
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return 0;
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}
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}
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