121 lines
2.6 KiB
C
Executable File
121 lines
2.6 KiB
C
Executable File
#define _POSIX_C_SOURCE 200809L
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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int main(int argc, char ** argv) {
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int silent_mode = 0;
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int print_all_diff = 0;
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int keep_printing = 1;
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int files_differ = 0;
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int i, f1num = 1;
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FILE *file1, *file2;
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char c1, c2;
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int line = 1, byte = 1;
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if(argv[1][0] == '-' && argv[1][1] == 's' && argv[1][2] == '\0') {
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silent_mode = 1;
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f1num++;
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if(argv[2][0] == '-' && argv[2][1] == 'l' &&
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argv[2][2] == '\0') {
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f1num++;
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}
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}
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else if(argv[1][0] == '-' && argv[1][1] == 'l' &&
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argv[1][2] == '\0') {
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print_all_diff = 1;
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f1num++;
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if(argv[2][0] == '-' && argv[2][1] == 's' &&
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argv[2][2] == '\0') {
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f1num++;
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}
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}
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if(strcmp(argv[f1num], "-") == 0 && strcmp(argv[f1num+1], "-") == 0) {
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fprintf(stderr, "%s: Cannot accept stdin for both files\n", argv[0]);
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return 2;
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}
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else if(strcmp(argv[f1num], "-") == 0) {
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file1 = stdin;
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file2 = fopen(argv[f1num+1], "r");
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}
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else if(strcmp(argv[f1num+1], "-") == 0) {
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file1 = fopen(argv[f1num], "r");
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file2 = stdin;
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}
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else {
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file1 = fopen(argv[f1num], "r");
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file2 = fopen(argv[f1num+1], "r");
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}
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if(silent_mode) {
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c1 = fgetc(file1);
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c2 = fgetc(file2);
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for(i = 0; !(c1 == EOF || c2 == EOF); i++) {
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if(c1 != c2) {
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return 1;
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}
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c1 = fgetc(file1);
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c2 = fgetc(file2);
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}
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if(c1 != c2) {
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return 1;
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}
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else {
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return 0;
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}
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}
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else if(print_all_diff) {
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c1 = fgetc(file1);
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c2 = fgetc(file2);
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for(i = 0; !(c1 == EOF || c2 == EOF); i++) {
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if(c1 != c2) {
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printf("%d %o %o\n", byte, c1, c2);
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files_differ = 1;
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}
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c1 = fgetc(file1);
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c2 = fgetc(file2);
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line++;
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byte++;
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}
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if(c1 != c2) {
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fprintf(stderr, "%s: EOF on %s%s\n", argv[0],
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c1 == EOF ? argv[f1num] : argv[f1num+1], "");
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return 1;
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}
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else if(files_differ) {
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return 1;
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}
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else {
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return 0;
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}
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}
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else {
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c1 = fgetc(file1);
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c2 = fgetc(file2);
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for(i = 0; !(c1 == EOF || c2 == EOF); i++) {
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if(c1 != c2 && keep_printing) {
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keep_printing = 0;
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printf("%s %s differ: char %d, line %d\n", argv[f1num], argv[f1num+1], byte, line);
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files_differ = 1;
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}
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c1 = fgetc(file1);
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c2 = fgetc(file2);
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if(c1 == '\n') line++;
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byte++;
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}
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if(c1 != c2) {
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fprintf(stderr, "%s: EOF on %s%s\n", argv[0],
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c1 == EOF ? argv[f1num] : argv[f1num+1], "");
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return 1;
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}
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else if(files_differ) {
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return 1;
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}
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else {
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return 0;
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}
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}
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}
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