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

int main(int argc, char *argv[]) {
    char *src = "src-test.txt";
    char *dst = "dst-test.txt";

    if (argc == 3) {
        src = strdup(argv[1]);
        dst = strdup(argv[2]);
    } else {
        fprintf(stderr, "Argumentos invalidos.\n");
        return 1;
    }

    FILE *fpsrc, *fpdst;

    fpsrc = fopen(src, "r");

    if (fpsrc == NULL) {
        perror("fopen");
        return 1;
    }

    fpdst = fopen(dst, "w");

    if (fpdst == NULL) {
        perror("fopen");
        return 1;
    }

    int c;
    while ((c = fgetc(fpsrc)) && c != EOF) {
        fputc(toupper(c), fpdst);
    }

    fclose(fpsrc);
    fclose(fpdst);

    printf("Archivo duplicado en mayusculas con exito en: %s\n", dst);

    return 0;
}