#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
#include <string.h>
#include "clog.h"

// Error handlings sometimes uses the goto statement.

#define _strings_match(s1, s2) (strcmp((s1), (s2)) == 0)
#define ABORT(...) do { \
    exit_code = EXIT_FAILURE; \
    fprintf(stderr, "%s", this_executable); \
    fprintf(stderr, __VA_ARGS__); \
    goto end; \
} while(false)

int main(int argc, const char* argv[]) {
    // Assume that the command is always called as:
    //    gcc -o «executable» «▒▒▒.c»
    
    // This won't be perfect at first.  We will walk through some pitfalls.
    //
    // THIS IS BUGGY (SO FAR)

    const char* this_executable = argv[0];
    int exit_code = EXIT_SUCCESS;  // default is success!

    if(argc != 4) { // because our specification is very narrow for this
        ABORT("Need exactly 3 arguments\n");
        goto end;
    }
    else {
        const char* flag = argv[1];
        const char* executable_path = argv[2];
        const char* c_path = argv[3];

        if(!_strings_match(flag, "-o")) {
            ABORT("First argument must be \"-o\"\n");
            goto end;
        }

        if(strlen(executable_path) == 0) {
            ABORT("Second argument must not be blank.\n");
            goto end;
        }

        // Make sure the .c file ends with .c
        if(c_path[strlen(c_path) -2] != '.' || c_path[strlen(c_path) - 1] != 'c') {
            ABORT("Third argument must end with .c\n");
            goto end;
        }

        printf("# TODO:  Compile %s to create executable %s.\n", argv[3], argv[2]);
    }

end:
    printf("Doing cleanup.\n");
    printf("MY_GCC is exiting.  Cleanup has been completed.\n");

    return exit_code;
}

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