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cc65/test/isequal.c

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// minimal tool to compare two text files
#include <stdlib.h>
#include <stdio.h>
/* get the next character from FILE and convert commonly used line-endings all
into the same value (0x0a, as used on *nix systems)
recognized values/pairs:
0x0a (LF) Linux, macOS
0x0d, 0x0a (CR, LF) Windows, MSDOS, OS/2
0x0d (CR) classic MacOS
*/
int getnext(FILE *f)
{
int c = fgetc(f);
if (c == 0x0d) {
if (!feof(f)) {
int n = fgetc(f);
if (n != 0x0a) {
ungetc(n, f);
}
clearerr(f); /* clears EOF when we did not push back */
}
return 0x0a;
}
return c;
}
int main(int argc, char *argv[])
{
FILE *f1, *f2;
if (argc < 3) {
return EXIT_FAILURE;
}
f1 = fopen(argv[1], "rb");
f2 = fopen(argv[2], "rb");
if ((f1 == NULL) || (f2 == NULL)) {
return EXIT_FAILURE;
}
for(;;) {
if (feof(f1) && feof(f2)) {
return EXIT_SUCCESS;
} else if (feof(f1) || feof(f2)) {
return EXIT_FAILURE;
}
if (getnext(f1) != getnext(f2)) {
return EXIT_FAILURE;
}
}
}