manual/CHAPTER_StateOfTheArt/cmp_tbdata.c

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

int line = 0;
char buffer1[1024];
char buffer2[1024];

void check(bool ok)
{
    if (ok)
        return;
    // fprintf(stderr, "Error in testbench output compare (line=%d):\n-%s\n+%s\n", line, buffer1, buffer2);
    exit(1);
}

int main(int argc, char **argv)
{
    FILE *f1, *f2;
    bool eof1, eof2;
    int i;

    check(argc == 3);

    f1 = fopen(argv[1], "r");
    f2 = fopen(argv[2], "r");

    check(f1 && f2);

    while (!feof(f1) && !feof(f2))
    {
        line++;
        buffer1[0] = 0;
        buffer2[0] = 0;

        eof1 = fgets(buffer1, 1024, f1) == NULL;
        eof2 = fgets(buffer2, 1024, f2) == NULL;

        if (*buffer1 && buffer1[strlen(buffer1)-1] == '\n')
            buffer1[strlen(buffer1)-1] = 0;

        if (*buffer2 && buffer2[strlen(buffer2)-1] == '\n')
            buffer2[strlen(buffer2)-1] = 0;

        check(eof1 == eof2);

        for (i = 0; buffer1[i] || buffer2[i]; i++)
        {
            check(buffer1[i] != 0 && buffer2[i] != 0);

            // first argument is the reference. An 'z' or 'x'
            // here means we don't care about the result.
            if (buffer1[i] == 'z' || buffer1[i] == 'x')
                continue;

            check(buffer1[i] == buffer2[i]);
        }
    }

    check(feof(f1) && feof(f2));

    fclose(f1);
    fclose(f2);
    return 0;
}