Script to compare two pgm files to see if they are the same. Compile using: gcc -Wall compare.c. Run ./a.out to see usage.

compare.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define KRED  "\x1B[31m"
#define KGRN  "\x1B[32m"
#define KNRM  "\x1B[0m"

int main(int argv, char **argc) {
    if (argv != 3) {
        printf("This program compares two pgm files to see if they are the same. Whitespace is ignored.\n");
        printf("Use: ./a.out <fileone.pgm> <filetwo.pgm>\n");
        return 0;
    }

    FILE *fileOne; 
    FILE *fileTwo;

    fileOne = fopen(argc[1], "r");
    if (fileOne == NULL) {
        printf("Could not open file one. Check to see if file exists.\n");
        return 0;
    }

    fileTwo = fopen(argc[2], "r");
    if (fileTwo == NULL) {
        printf("Could not open file two. Check to see if file exists.\n");
        return 0;
    }

    printf("Tests:\n");

    char magic[2][3];

    fscanf(fileOne, "%s", magic[0]);
    fscanf(fileTwo, "%s", magic[1]);

    printf("%s1. File encoding matches: ", KNRM);
    if (strcmp(magic[0], magic[1]) != 0) {
        printf("%sFAILED.\n", KRED);
        printf("%s     %s's content: %s\n", KNRM, argc[1], magic[0]);
        printf("%s     %s's content: %s\n", KNRM, argc[2], magic[1]);
    }
    else printf("%sPASSED.\n", KGRN);

    int intHolder[2];

    fscanf(fileOne, "%d", &intHolder[0]);
    fscanf(fileTwo, "%d", &intHolder[1]);

    printf("%s2. Width matches: ", KNRM);
    if (intHolder[0] != intHolder[1]) {
        printf("%sFAILED.\n", KRED);
        printf("%s    %s's content: %d\n", KNRM, argc[1], intHolder[0]);
        printf("%s    %s's content: %d\n", KNRM, argc[2], intHolder[1]);
    }
    else printf("%sPASSED.\n", KGRN);

    fscanf(fileOne, "%d", &intHolder[0]);
    fscanf(fileTwo, "%d", &intHolder[1]);

    printf("%s3. Height matches: ", KNRM);
    if(intHolder[0] != intHolder[1]) {
        printf("%sFAILED.\n", KRED);
        printf("%s    %s's content: %d\n", KNRM, argc[1], intHolder[0]);
        printf("%s    %s's content: %d\n", KNRM, argc[2], intHolder[1]);
    }
    else printf("%sPASSED.\n", KGRN);

    fscanf(fileOne, "%d", &intHolder[0]);
    fscanf(fileTwo, "%d", &intHolder[1]);

    printf("%s4. Intensity matches: ", KNRM);
    if (intHolder[0] != intHolder[1]) {
        printf("%sFAILED.\n", KRED);
        printf("%s    %s's content: %d\n", KNRM, argc[1], intHolder[0]);
        printf("%s    %s's content: %d\n", KNRM, argc[2], intHolder[1]);
    }
    else printf("%sPASSED.\n", KGRN);

    printf("%s4. Column matches: \n", KNRM);

    fscanf(fileOne, "%d", &intHolder[0]);
    fscanf(fileTwo, "%d", &intHolder[1]);

    int counter = 1;
    int passed = 1;

    while(!feof(fileOne) && !feof(fileTwo)) {
        if (intHolder[0] != intHolder[1]) {
            printf("%s    FAILED AT ITEM %D. ", KRED, counter);
            printf("%s%s's content: %d,", KNRM, argc[1], intHolder[0]);
            printf("%s   %s's content: %d\n", KNRM, argc[2], intHolder[1]);
            passed = 0;
        }

        fscanf(fileOne, "%d", &intHolder[0]);
        fscanf(fileTwo, "%d", &intHolder[1]);
        counter++;
    }

    if (feof(fileOne) && !feof(fileTwo)) {
        printf("%s    PARTIAL FAIL: %s was shorter than %s. Might be a missing newline at the end of file one, but check manually to be sure.\n", KRED, argc[1], argc[2]);
    }
    else if(feof(fileTwo) && !feof(fileOne)) {
        printf("%s    PARTIAL FAIL: %s was shorter than %s. Might be a missing newline at the end of file two, but check manually to be sure.\n", KRED, argc[2], argc[1]);
    }

    if (passed) printf("%s    PASSED.\n", KGRN);

    fclose(fileOne);
    fclose(fileTwo);

    return 0;

}