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/*
* Utility routines for writing floating point tests.
*
* Currently provides only one function, which checks whether a double is
* equal to an expected value within a given epsilon. This is broken into a
* separate source file from the rest of the basic C TAP library because it
* may require linking with -lm on some platforms, and the package may not
* otherwise care about floating point.
*
* This file is part of C TAP Harness. The current version plus supporting
* documentation is at <http://www.eyrie.org/~eagle/software/c-tap-harness/>.
*
* Copyright 2008, 2010, 2012, 2013, 2014, 2015 Russ Allbery <eagle@eyrie.org>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
/* Required for isnan() and isinf(). */
#if defined(__STRICT_ANSI__) || defined(PEDANTIC)
# ifndef _XOPEN_SOURCE
# define _XOPEN_SOURCE 600
# endif
#endif
#include <math.h>
#include <stdarg.h>
#include <stdio.h>
#include <tests/tap/basic.h>
#include <tests/tap/float.h>
/*
* Takes an expected double and a seen double and assumes the test passes if
* those two numbers are within delta of each other.
*/
int
is_double(double wanted, double seen, double epsilon, const char *format, ...)
{
va_list args;
int success;
va_start(args, format);
fflush(stderr);
if ((isnan(wanted) && isnan(seen))
|| (isinf(wanted) && isinf(wanted) == isinf(seen))
|| fabs(wanted - seen) <= epsilon) {
success = 1;
okv(1, format, args);
} else {
success = 0;
diag("wanted: %g", wanted);
diag(" seen: %g", seen);
okv(0, format, args);
}
return success;
}
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