2 * Utility routines for writing floating point tests.
4 * Currently provides only one function, which checks whether a double is
5 * equal to an expected value within a given epsilon. This is broken into a
6 * separate source file from the rest of the basic C TAP library because it
7 * may require linking with -lm on some platforms, and the package may not
8 * otherwise care about floating point.
10 * This file is part of C TAP Harness. The current version plus supporting
11 * documentation is at <http://www.eyrie.org/~eagle/software/c-tap-harness/>.
13 * Copyright 2008, 2010, 2012 Russ Allbery <rra@stanford.edu>
15 * Permission is hereby granted, free of charge, to any person obtaining a
16 * copy of this software and associated documentation files (the "Software"),
17 * to deal in the Software without restriction, including without limitation
18 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
19 * and/or sell copies of the Software, and to permit persons to whom the
20 * Software is furnished to do so, subject to the following conditions:
22 * The above copyright notice and this permission notice shall be included in
23 * all copies or substantial portions of the Software.
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
26 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
27 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
28 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
29 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
30 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
31 * DEALINGS IN THE SOFTWARE.
34 /* Required for isnan() and isinf(). */
35 #if defined(__STRICT_ANSI__) || defined(PEDANTIC)
36 # ifndef _XOPEN_SOURCE
37 # define _XOPEN_SOURCE 600
45 #include <tests/tap/basic.h>
46 #include <tests/tap/float.h>
49 * Takes an expected double and a seen double and assumes the test passes if
50 * those two numbers are within delta of each other.
53 is_double(double wanted
, double seen
, double epsilon
, const char *format
, ...)
57 va_start(args
, format
);
59 if ((isnan(wanted
) && isnan(seen
))
60 || (isinf(wanted
) && isinf(seen
) && wanted
== seen
)
61 || fabs(wanted
- seen
) <= epsilon
)
64 printf("# wanted: %g\n# seen: %g\n", wanted
, seen
);