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72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
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/*
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Copyright 2020 The cc65 Authors
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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/*
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Tests of union of bit-fields; see https://sourceforge.net/p/cc65/mailman/message/36152700/
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*/
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#include <stdio.h>
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typedef union {
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unsigned int bf;
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struct {
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unsigned int a : 1;
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unsigned int b : 1;
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unsigned int c : 1;
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};
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} bitfield_t;
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static unsigned char failures = 0;
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int main (void)
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{
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bitfield_t bitfield = {0};
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printf ("Bitfield: %u\n", bitfield.bf);
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if (bitfield.bf != 0) failures++;
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bitfield.a = bitfield.a ^ 1;
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printf ("a=1: %u\n", bitfield.bf);
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if (bitfield.bf != 1) failures++;
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bitfield.a = bitfield.a ^ 1;
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printf ("a=0: %u\n\n", bitfield.bf);
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if (bitfield.bf != 0) failures++;
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bitfield.b = bitfield.b ^ 1;
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printf ("b=1: %u\n", bitfield.bf);
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if (bitfield.bf != 2) failures++;
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bitfield.b = bitfield.b ^ 1;
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printf ("b=0: %u\n\n", bitfield.bf);
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if (bitfield.bf != 0) failures++;
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bitfield.c = bitfield.c ^ 1;
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printf ("c=1: %u\n", bitfield.bf);
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if (bitfield.bf != 4) failures++;
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bitfield.c = bitfield.c ^ 1;
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printf ("c=0: %u\n\n", bitfield.bf);
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if (bitfield.bf != 0) failures++;
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return failures;
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}
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