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/* tpl_mpfr.c -- Helper functions for mpfr data.
Copyright (C) 2012, 2013 INRIA
This file is part of GNU MPC.
GNU MPC is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
GNU MPC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see http://www.gnu.org/licenses/ .
*/
#include "mpc-tests.h"
static mpfr_prec_t
tpl_read_mpfr_prec (mpc_datafile_context_t* datafile_context)
{
unsigned long prec;
int n;
if (datafile_context->nextchar == EOF) {
printf ("Error: Unexpected EOF when reading mpfr precision "
"in file '%s' line %lu\n",
datafile_context->pathname, datafile_context->line_number);
exit (1);
}
ungetc (datafile_context->nextchar, datafile_context->fd);
n = fscanf (datafile_context->fd, "%lu", &prec);
if (ferror (datafile_context->fd)) /* then also n == EOF */
perror ("Error when reading mpfr precision");
if (n == 0 || n == EOF || prec < MPFR_PREC_MIN || prec > MPFR_PREC_MAX) {
printf ("Error: Impossible mpfr precision in file '%s' line %lu\n",
datafile_context->pathname, datafile_context->line_number);
exit (1);
}
datafile_context->nextchar = getc (datafile_context->fd);
tpl_skip_whitespace_comments (datafile_context);
return (mpfr_prec_t) prec;
}
static void
tpl_read_mpfr_mantissa (mpc_datafile_context_t* datafile_context, mpfr_ptr x)
{
if (datafile_context->nextchar == EOF) {
printf ("Error: Unexpected EOF when reading mpfr mantissa "
"in file '%s' line %lu\n",
datafile_context->pathname, datafile_context->line_number);
exit (1);
}
ungetc (datafile_context->nextchar, datafile_context->fd);
if (mpfr_inp_str (x, datafile_context->fd, 0, GMP_RNDN) == 0) {
printf ("Error: Impossible to read mpfr mantissa "
"in file '%s' line %lu\n",
datafile_context->pathname, datafile_context->line_number);
exit (1);
}
datafile_context->nextchar = getc (datafile_context->fd);
tpl_skip_whitespace_comments (datafile_context);
}
void
tpl_read_mpfr (mpc_datafile_context_t* datafile_context, mpfr_ptr x,
int* known_sign)
{
int sign;
mpfr_set_prec (x, tpl_read_mpfr_prec (datafile_context));
sign = datafile_context->nextchar;
tpl_read_mpfr_mantissa (datafile_context, x);
/* the sign always matters for regular values ('+' is implicit),
but when no sign appears before 0 or Inf in the data file, it means
that only absolute value must be checked. */
MPC_ASSERT(known_sign != NULL);
*known_sign =
(!mpfr_zero_p (x) && !mpfr_inf_p (x)) || sign == '+' || sign == '-';
}
void
tpl_read_mpfr_rnd (mpc_datafile_context_t* datafile_context, mpfr_rnd_t* rnd)
{
switch (datafile_context->nextchar)
{
case 'n': case 'N':
*rnd = GMP_RNDN;
break;
case 'z': case 'Z':
*rnd = GMP_RNDZ;
break;
case 'u': case 'U':
*rnd = GMP_RNDU;
break;
case 'd': case 'D':
*rnd = GMP_RNDD;
break;
default:
printf ("Error: Unexpected rounding mode '%c' in file '%s' line %lu\n",
datafile_context->nextchar,
datafile_context->pathname,
datafile_context->line_number);
exit (1);
}
datafile_context->nextchar = getc (datafile_context->fd);
if (datafile_context->nextchar != EOF
&& !isspace (datafile_context->nextchar)) {
printf ("Error: Rounding mode not followed by white space "
"in file '%s' line %lu\n",
datafile_context->pathname, datafile_context->line_number);
exit (1);
}
tpl_skip_whitespace_comments (datafile_context);
}
void
tpl_read_mpfr_inex (mpc_datafile_context_t* datafile_context, int *ternary)
{
tpl_read_ternary(datafile_context, ternary);
}
int
tpl_same_mpfr_value (mpfr_ptr x1, mpfr_ptr x2, int known_sign)
{
/* The sign of zeroes and infinities is checked only when known_sign is
true. */
if (mpfr_nan_p (x1))
return mpfr_nan_p (x2);
if (mpfr_inf_p (x1))
return mpfr_inf_p (x2) &&
(!known_sign || mpfr_signbit (x1) == mpfr_signbit (x2));
if (mpfr_zero_p (x1))
return mpfr_zero_p (x2) &&
(!known_sign || mpfr_signbit (x1) == mpfr_signbit (x2));
return mpfr_cmp (x1, x2) == 0;
}
int
tpl_check_mpfr_data (mpfr_t got, mpfr_data_t expected)
{
return tpl_same_mpfr_value (got, expected.mpfr, expected.known_sign);
}
void
tpl_copy_mpfr (mpfr_ptr dest, mpfr_srcptr src)
{
/* source and destination are assumed to be of the same precision , so the
copy is exact (no rounding) */
MPC_ASSERT(mpfr_get_prec (dest) == mpfr_get_prec (src));
mpfr_set (dest, src, GMP_RNDN);
}
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