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Add test of union of bit-field from mailing list

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https://sourceforge.net/p/cc65/mailman/message/36152700/

This currently works, but add a test to prevent future regressions.
This commit is contained in:
Jesse Rosenstock 2020-08-17 09:22:15 +02:00
parent c4698dfd07
commit 6db93d58cf
1 changed files with 71 additions and 0 deletions
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test/val/bitfield-union.c Normal file
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/*
Copyright 2020 The cc65 Authors
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
/*
Tests of union of bit-fields; see https://sourceforge.net/p/cc65/mailman/message/36152700/
*/
#include <stdio.h>
typedef union {
unsigned int bf;
struct {
unsigned int a : 1;
unsigned int b : 1;
unsigned int c : 1;
};
} bitfield_t;
static unsigned char failures = 0;
int main (void)
{
bitfield_t bitfield = {0};
printf ("Bitfield: %u\n", bitfield.bf);
if (bitfield.bf != 0) failures++;
bitfield.a = bitfield.a ^ 1;
printf ("a=1: %u\n", bitfield.bf);
if (bitfield.bf != 1) failures++;
bitfield.a = bitfield.a ^ 1;
printf ("a=0: %u\n\n", bitfield.bf);
if (bitfield.bf != 0) failures++;
bitfield.b = bitfield.b ^ 1;
printf ("b=1: %u\n", bitfield.bf);
if (bitfield.bf != 2) failures++;
bitfield.b = bitfield.b ^ 1;
printf ("b=0: %u\n\n", bitfield.bf);
if (bitfield.bf != 0) failures++;
bitfield.c = bitfield.c ^ 1;
printf ("c=1: %u\n", bitfield.bf);
if (bitfield.bf != 4) failures++;
bitfield.c = bitfield.c ^ 1;
printf ("c=0: %u\n\n", bitfield.bf);
if (bitfield.bf != 0) failures++;
return failures;
}