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92 lines
2.3 KiB
C
92 lines
2.3 KiB
C
/*
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** !!DESCRIPTION!! Simple tests of pointer-to-array dereferences
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** !!ORIGIN!! cc65 regression tests
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** !!LICENCE!! Public Domain
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** !!AUTHOR!! 2015-06-29, Greg King
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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 size_t Size;
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typedef unsigned char array_t[4][4];
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static array_t table = {
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{12, 13, 14, 15},
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{ 8, 9, 10, 11},
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{ 4, 5, 6, 7},
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{ 0, 1, 2, 3}
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};
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static array_t *tablePtr = &table;
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static unsigned (*vector)[2];
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static unsigned char y = 0, x;
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int main(void)
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{
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/* The indirection must convert the expression-type (from Pointer into
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** Array); but, it must not convert the value, because it already points
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** to the start of the array.
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*/
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/* (Note: I reduce output clutter by using a variable to prevent
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** compiler warnings about constant comparisons and unreachable code.
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*/
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if ((Size = sizeof *tablePtr) != sizeof table) {
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++failures;
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}
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if (*tablePtr != table) {
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++failures;
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}
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/* Test fetching. */
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do {
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x = 0;
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do {
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if ((*tablePtr)[y][x] != table[y][x]) {
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++failures;
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printf("(*tableptr)[%u][%u] (%u) != table[%u][%u] (%u).\n",
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y, x, (*tablePtr)[y][x],
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y, x, table[y][x]);
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}
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} while (++x < sizeof table[0]);
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} while (++y < sizeof table / sizeof table[0]);
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vector = (unsigned (*)[])table[1];
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if ((*vector)[1] != 0x0B0A) {
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++failures;
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}
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/* Test storing. */
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(*tablePtr)[2][1] = 42;
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if (table[2][1] != 42) {
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++failures;
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printf("table[2][1] == %u (should have changed from 5 to 42).\n",
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table[2][1]);
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}
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x = 3;
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y = 1;
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(*tablePtr)[y][x] = 83;
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if (table[1][3] != 83) {
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++failures;
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printf("table[y][x] == %u (should have changed from 11 to 83).\n",
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table[1][3]);
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}
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/* Test triple indirection. It should compile to two indirection
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** operations.
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*/
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--***tablePtr;
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if (**table != 11) {
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++failures;
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printf("**table == %u (should have changed from 12 to 11).\n",
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table[0][0]);
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}
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if (failures != 0) {
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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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