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4e4e4c2d21
These are not required to be supported (only int, signed int, and unsigned int are required), but most compilers support it. https://port70.net/~nsz/c/c89/c89-draft.html#3.5.2.1 https://port70.net/~nsz/c/c89/c89-draft.html#A.6.5.8 For consistency with other integral types, plain `char` bit-fields are unsigned, regardless of the `--signed-chars` option. Fixes #1047
83 lines
2.0 KiB
C
83 lines
2.0 KiB
C
/*
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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 char bit-fields; see https://github.com/cc65/cc65/issues/1047
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*/
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#include <stdio.h>
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static unsigned char failures = 0;
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static struct chars {
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unsigned char a : 3;
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unsigned char b : 3;
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unsigned char c : 3;
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} cs = {4, 1, 3};
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static void test_char_bitfield(void)
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{
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if (sizeof (cs) != 2) {
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printf("Got sizeof (cs) = %zu, expected 2.\n", sizeof (cs));
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failures++;
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}
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if (cs.a != 4) {
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printf("Got cs.a = %u, expected 4.\n", cs.a);
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failures++;
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}
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if (cs.b != 1) {
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printf("Got cs.b = %u, expected 1.\n", cs.b);
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failures++;
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}
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if (cs.c != 3) {
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printf("Got cs.c = %u, expected 3.\n", cs.c);
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failures++;
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}
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cs.a = -1;
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cs.b = 6;
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cs.c = 1;
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if (cs.a != 7) {
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printf("Got cs.a = %u, expected 7.\n", cs.a);
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failures++;
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}
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if (cs.b != 6) {
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printf("Got cs.b = %u, expected 6.\n", cs.b);
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failures++;
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}
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if (cs.c != 1) {
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printf("Got cs.c = %u, expected 1.\n", cs.c);
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failures++;
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}
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}
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int main(void)
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{
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test_char_bitfield();
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printf("failures: %u\n", failures);
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return failures;
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}
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