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54 lines
1.1 KiB
C
54 lines
1.1 KiB
C
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/* pr#1461 Fixed pointer subtraction in certain very rare cases */
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#include <stdlib.h>
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#include <stdio.h>
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static int err = 0;
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static int a[1], *p;
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static unsigned int i1, i2;
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int test1(void)
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{
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p = a - (int)a;
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printf("a: %p - (int)a: 0x%x = p: %p\n", a, (int)a, p);
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printf("i1: 0x%x - i2: 0x%x = p: %p\n", i1, i2, i1 - i2);
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if ((int)p != (i1 - i2)) {
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printf("-> failed\n");
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return 1;
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}
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return 0;
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}
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int test2(void)
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{
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p = p - (int)a;
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printf("p: %p - (int)a: 0x%x = p: %p\n", p, (int)a, p);
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printf("p: %p - i2: 0x%x = p: %p\n", p, i2, 0x1234 - i2);
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if ((int)p != (0x1234 - i2)) {
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printf("-> failed\n");
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return 1;
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}
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return 0;
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}
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int main(void)
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{
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a[0] = 0x4711;
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i1 = (int)a;
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i2 = i1 << 1;
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p = (int*)0x1234;
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printf("p: %p &a[0]: %p a: %p (int)a: 0x%x i1: 0x%x i2: 0x%x\n", p, &a[0], a, (int)a, i1, i2);
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err += test1();
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p = (int*)0x1234;
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printf("p: %p &a[0]: %p a: %p (int)a: 0x%x i1: 0x%x i2: 0x%x\n", p, &a[0], a, (int)a, i1, i2);
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err += test2();
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return err;
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}
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