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git-svn-id: file:///srv/svn/repos/haiku/buildtools/trunk@29042 a95241bf-73f2-0310-859d-f6bbb57e9c96
88 lines
2.4 KiB
C
88 lines
2.4 KiB
C
/* mpf_inp_str(dest_float, stream, base) -- Input a number in base
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BASE from stdio stream STREAM and store the result in DEST_FLOAT.
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Copyright 1999, 2001, 2002, 2004, 2006, 2007 Free Software Foundation, Inc.
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Contributed by the Arenaire and Cacao projects, INRIA.
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(Copied from GMP, file mpf/inp_str.c)
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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 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 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 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 MPFR Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include <ctype.h>
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#include "mpfr-impl.h"
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size_t
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mpfr_inp_str (mpfr_ptr rop, FILE *stream, int base, mp_rnd_t rnd_mode)
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{
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char *str;
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size_t alloc_size, str_size;
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int c;
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int retval;
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size_t nread;
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MPFR_CLEAR_FLAGS(rop);
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if (stream == NULL)
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stream = stdin;
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alloc_size = 100;
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str = (char *) (*__gmp_allocate_func) (alloc_size);
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str_size = 0;
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nread = 0;
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/* Skip whitespace. */
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do
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{
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c = getc (stream);
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nread++;
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}
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while (isspace (c));
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/* number of characters read is nread */
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for (;;)
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{
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if (str_size >= alloc_size)
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{
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size_t old_alloc_size = alloc_size;
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alloc_size = alloc_size * 3 / 2;
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str = (char *) (*__gmp_reallocate_func) (str, old_alloc_size, alloc_size);
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}
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if (c == EOF || isspace (c))
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break;
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str[str_size++] = c;
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c = getc (stream);
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}
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ungetc (c, stream);
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/* number of characters read is nread + str_size - 1 */
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/* we can exit the for loop only by the break instruction,
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then necessarily str_size >= alloc_size was checked, so
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now str_size < alloc_size */
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str[str_size] = '\0';
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retval = mpfr_set_str (rop, str, base, rnd_mode);
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(*__gmp_free_func) (str, alloc_size);
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if (retval == -1)
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return 0; /* error */
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return str_size + nread - 1;
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}
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