echo_input_0717_0504

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

/*
* Basically this program was simply made as practice
* The only job of the program is to "echo" what the user inputs back,
* And possibly print a number, if it was there.
*/


int main() {
    int a_num = 0;
    int boofer_size = 200;
    // Use calloc to allocate an array which can hold 200 characters
    char *boofer = calloc(sizeof(char), boofer_size);
    // Did the allocation fail?
    if(boofer == NULL) {
        // Skip to the end of the program after printing a warning
        printf("Failed to allocate buffer!");
        goto end;
    }

    // Use fgets() to get the user input
    // I heard this was the safest way to do it
    char* success = fgets(boofer, boofer_size, stdin);
    if(success != NULL) {
        // If we succeeded, then use sscanf_s() to get leading number
        int items_assigned = sscanf_s(boofer, "%d", &a_num);
        printf(boofer);

        if(items_assigned == 1) {
            // If we got the number, print it.
            printf("%d", a_num);
        }

        // Successfully free the memory knowing nothing could go wrong??
        free(boofer);
    }

    // Return 0 to indicate everything went fine
end:
    return 0;
}