mirror of https://github.com/macssh/macssh.git
113 lines
3.1 KiB
C
Executable File
113 lines
3.1 KiB
C
Executable File
/* mpfr_set_str_raw -- set a floating-point number from a binary string
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Copyright (C) 1999 PolKA project, Inria Lorraine and Loria
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This file is part of the MPFR Library.
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The MPFR 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 MPFR 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 MPFR 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 <stdio.h>
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#include <stdlib.h>
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#ifdef HAS_STRING_H
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#include <string.h>
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#else
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#include <strings.h>
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#endif
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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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#include "mpfr.h"
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/* Currently the number should be of the form +/- xxxx.xxxxxxEyy, with
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decimal exponent. The mantissa of x is supposed to be large enough
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to hold all the bits of str. */
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void
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#if __STDC__
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mpfr_set_str_raw(mpfr_ptr x, char *str)
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#else
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mpfr_set_str_raw(x, str)
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mpfr_ptr x;
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char *str;
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#endif
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{
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char *str2, *str0, negative = 0;
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unsigned long j, l, k = 0, xsize, cnt; mp_limb_t *xp;
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long expn = 0, e; char *endstr2;
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xp = x -> _mp_d;
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xsize = 1 + (PREC(x)-1)/BITS_PER_MP_LIMB;
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str0 = str2 = (char *) malloc((strlen(str)+1)*sizeof(char));
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if (*str == '-') { negative = 1; str++; }
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else if (*str == '+') str++;
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while (*str == '0') { str++; }
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while (*str == '0' || *str == '1')
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{ *(str2++) = *(str++); k++; }
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if (*str == '.')
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{
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str++;
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while (*str == '0' || *str == '1')
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{ *(str2++) = *(str++); }
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if (*str == '[') { while (*str != ']') str++; }
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}
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if (*str == '[') { while (*str != ']') str++; }
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if (*str == 'e' || *str == 'E')
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{
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e = atol(++str); /* signed exponent after 'e' or 'E' */
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expn = k + e;
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if (expn < e)
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fprintf(stderr, "Warning: overflow in exponent in Str -> mpfr\n");
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}
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else expn=k;
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endstr2 = str2;
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*str2 = (char) 0; /* end of string */
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l = (strlen(str0) - 1) / BITS_PER_MP_LIMB + 1; str2 = str0;
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/* str2[0]..endstr2[-1] contains the mantissa */
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for (k = 1; k <= l; k++)
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{
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j = 0;
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xp[xsize - k] = 0;
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while (str2<endstr2 && j < BITS_PER_MP_LIMB)
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{
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xp[xsize - k] = (xp[xsize - k] << 1) + (*str2 - '0');
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str2++; j++;
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}
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xp[xsize - k] <<= (BITS_PER_MP_LIMB - j);
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}
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for (; k <= xsize; k++) { xp[xsize - k] = 0; }
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count_leading_zeros(cnt, xp[xsize - 1]);
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if (cnt) mpn_lshift(xp, xp, xsize, cnt);
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x -> _mp_exp = expn - cnt;
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x -> _mp_size = xsize; if (negative) CHANGE_SIGN(x);
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free(str0);
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/* May change to take into account : syntax errors, overflow in exponent,
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string truncated because of size of x */
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}
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