lmiskiew
52 lines
1.7 KiB
C
52 lines
1.7 KiB
C
#include <unistd.h>
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int main(int argc, char ** argv) {
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const char source[] = {0, 1, 2, 3, 4, 5, 6};
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char destination[] = {0, 0, 0, 0, 0, 0};
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const char flipped_source[] = {1, 0, 3, 2, 5, 4};
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const char first_two_source_bytes_flipped[] = {1, 0};
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swab(source, destination, /* nbytes */ -3);
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for (int i = 0; i < sizeof(destination); ++i) {
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if (destination[i] != 0) {
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puts("If nbytes is negative destionation shouldn't be modified");
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return 1;
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}
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}
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swab(source, destination, /* nbytes */ 0);
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for (int i = 0; i < sizeof(destination); ++i) {
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if (destination[i] != 0) {
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puts("If nbytes is zero destionation shouldn't be modified");
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return 1;
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}
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}
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swab(source, destination, /* nbytes */ 3);
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for (int i = 0; i < sizeof(first_two_source_bytes_flipped); ++i) {
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if (destination[i] != first_two_source_bytes_flipped[i]) {
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puts("copied bytes don't match expected values");
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return 1;
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}
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}
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// If nbytes is not even it's not specified what should happen to the
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// last byte so the third byte in destination is not checked.
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for (int i = sizeof(first_two_source_bytes_flipped) + 1; i < sizeof(destination); ++i) {
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if (destination[i] != 0) {
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puts("swab modified too many bytes in destination");
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return 1;
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}
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}
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swab(source, destination, /* nbytes */ sizeof(destination));
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for (int i = 0; i < sizeof(destination); ++i) {
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if (destination[i] != flipped_source[i]) {
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puts("copied bytes don't match expected values");
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return 1;
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}
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}
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return 0;
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}
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