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- #include <stdio.h>
- #include <unistd.h>
- int main(int argc, char ** argv) {
- const char source[] = {0, 1, 2, 3, 4, 5, 6};
- char destination[] = {0, 0, 0, 0, 0, 0};
- const char flipped_source[] = {1, 0, 3, 2, 5, 4};
- const char first_two_source_bytes_flipped[] = {1, 0};
- swab(source, destination, -3);
- for (int i = 0; i < sizeof(destination); ++i) {
- if (destination[i] != 0) {
- puts("If nbytes is negative destionation shouldn't be modified");
- return 1;
- }
- }
- swab(source, destination, 0);
- for (int i = 0; i < sizeof(destination); ++i) {
- if (destination[i] != 0) {
- puts("If nbytes is zero destionation shouldn't be modified");
- return 1;
- }
- }
- swab(source, destination, 3);
- for (int i = 0; i < sizeof(first_two_source_bytes_flipped); ++i) {
- if (destination[i] != first_two_source_bytes_flipped[i]) {
- puts("copied bytes don't match expected values");
- return 1;
- }
- }
-
-
- for (int i = sizeof(first_two_source_bytes_flipped) + 1; i < sizeof(destination); ++i) {
- if (destination[i] != 0) {
- puts("swab modified too many bytes in destination");
- return 1;
- }
- }
- swab(source, destination, sizeof(destination));
- for (int i = 0; i < sizeof(destination); ++i) {
- if (destination[i] != flipped_source[i]) {
- puts("copied bytes don't match expected values");
- return 1;
- }
- }
- return 0;
- }
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