mirror of https://github.com/cc65/cc65.git
55 lines
1.2 KiB
C
55 lines
1.2 KiB
C
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// minimal tool to compare two text files
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#include <stdlib.h>
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#include <stdio.h>
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/* get the next character from FILE and convert commonly used line-endings all
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into the same value (0x0a, as used on *nix systems)
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recognized values/pairs:
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0x0a (LF) Linux, macOS
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0x0d, 0x0a (CR, LF) Windows, MSDOS, OS/2
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0x0d (CR) classic MacOS
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*/
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int getnext(FILE *f)
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{
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int c = fgetc(f);
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if (c == 0x0d) {
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if (!feof(f)) {
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int n = fgetc(f);
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if (n != 0x0a) {
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ungetc(n, f);
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}
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clearerr(f); /* clears EOF when we did not push back */
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}
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return 0x0a;
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}
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return c;
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}
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int main(int argc, char *argv[])
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{
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FILE *f1, *f2;
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if (argc < 3) {
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return EXIT_FAILURE;
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}
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f1 = fopen(argv[1], "rb");
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f2 = fopen(argv[2], "rb");
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if ((f1 == NULL) || (f2 == NULL)) {
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return EXIT_FAILURE;
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}
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for(;;) {
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if (feof(f1) && feof(f2)) {
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return EXIT_SUCCESS;
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} else if (feof(f1) || feof(f2)) {
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return EXIT_FAILURE;
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}
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if (getnext(f1) != getnext(f2)) {
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return EXIT_FAILURE;
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}
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}
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}
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