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1#include "reverse_lib.h"
2
3#include <err.h>
4#include <stdio.h>
5#include <stdlib.h>
6#include <string.h>
7#include <sysexits.h>
8#include <unistd.h>
9
10static const char test_file[] = "reverse.c";
11
12char* reverse_to_temp_file(const char* input_file) {
13 char* temp_filename = strdup("/tmp/reverse_test.XXXXXX");
14 int fd = mkstemp(temp_filename);
15 if (fd == -1) err(EX_IOERR, "Couldn't make a temporary file");
16 FILE* f = fdopen(fd, "w");
17 if (f == NULL) err(EX_IOERR, "Couldn't open temporary file");
18 reverse_file(input_file, f);
19 if (fclose(f) == EOF) err(EX_IOERR, "Couldn't close temporary file");
20 return temp_filename;
21}
22
23void test_reverse_twice_is_the_same() {
24 char* intermediate = reverse_to_temp_file(test_file);
25 char* back_to_normal = reverse_to_temp_file(intermediate);
26
27 FILE* f1 = fopen(test_file, "r");
28 if (f1 == NULL) err(EX_IOERR, "Couldn't open test file");
29 FILE* f2 = fopen(back_to_normal, "r");
30 if (f2 == NULL) err(EX_IOERR, "Couldn't open twice-reversed temp file");
31
32 for (int pos = 0; ; pos++) {
33 int c1 = fgetc(f1);
34 int c2 = fgetc(f2);
35 if (c1 == EOF && ferror(f1)) err(EX_IOERR, "Error reading test file");
36 if (c2 == EOF && ferror(f2)) err(EX_IOERR, "Error reading twice-reversed temp file");
37 if (c1 != c2) {
38 errx(EX_SOFTWARE, "Unexpected difference found at offset %d after reversing twice. "
39 "Expected %d but found %d", pos, c1, c2);
40 }
41 if (c1 == EOF) break;
42 }
43
44 if (fclose(f1) != 0) err(EX_IOERR, "Couldn't close test file");
45 if (fclose(f2) != 0) err(EX_IOERR, "Couldn't close twice-reversed temp file");
46 if (unlink(intermediate) == -1) err(EX_IOERR, "Couldn't remove intermediate temp file");
47 if (unlink(back_to_normal) == -1) err(EX_IOERR, "Couldn't remove twice-reversed temp file");
48 free(intermediate);
49 free(back_to_normal);
50}
51
52int main() {
53 test_reverse_twice_is_the_same();
54 puts("PASS");
55 return 0;
56}