mirror of https://github.com/cc65/cc65.git
72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
/* Bug # - Pointer compared to null pointer constant */
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#include <stdio.h>
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unsigned failures;
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struct S {
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char a[4];
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} *p;
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#define TEST_NULL(E) \
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do { \
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a = (E) == 0 && !(E); \
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if (!a) \
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{ \
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++failures; \
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printf("failed: " #E " should be null\n"); \
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} \
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} while(0);
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#define TEST_NON_NULL(E) \
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do { \
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a = (E) != 0 && !!(E) && (E); \
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if (!a) \
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{ \
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++failures; \
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printf("failed: " #E " should be non-null\n"); \
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} \
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} while(0);
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int main()
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{
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int a;
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/* Null pointer constant (per ISO C) compared equal to null pointer constant */
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TEST_NULL((void*)0)
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/* Null pointer compared equal to null pointer constant */
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TEST_NULL((char*)0)
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/* Null pointer obtained with -> */
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TEST_NULL(((struct S*)0)->a)
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/* Null pointer obtained with -> */
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TEST_NULL(p->a)
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/* Null pointer obtained with cast and -> */
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TEST_NULL(((struct S*)(a = 0))->a)
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/* Null pointer obtained with cast and -> */
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TEST_NULL((a = 0, ((struct S*)a)->a))
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/* Non-null pointer obtained with cast and -> */
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TEST_NON_NULL(((struct S*)(long)(a = 0x1234))->a)
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/* Non-null pointer obtained with cast and -> */
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TEST_NON_NULL((a = 0x1234, ((struct S*)a)->a))
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/* Non-null pointer obtained with cast and -> */
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TEST_NON_NULL(((struct S*)&a)->a)
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/* Non-null pointer obtained with cast and -> */
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TEST_NON_NULL(((struct S*)&main)->a)
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if (failures != 0)
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{
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printf("failures: %u\n", failures);
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}
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return failures;
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}
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