This program copies a file from one location to another.

FileCopy.c

//
// FileCopy.c
//
// This program copies a file from one location to another.
//
// Evan Wieland
// 9/6/2022
//

#include <stdio.h>
#include <sys/stat.h>

#define PATH  128
#define BLOCK 256

// Copy contents from one file to another
int cp(char *source, char *dest)
{
    FILE *fpSource, *fpDest;
    char buf[BLOCK];
    size_t size;

    if ((fpSource = fopen(source, "rb")) == NULL) {
        fprintf(stderr, "Error: Can't open %s", source);
        return 3;
    }else if ((fpDest = fopen(dest, "w")) == NULL) {
        fprintf(stderr, "Error: Can't open %s", dest);
        return 4;
    }

    while ((size = fread(buf, 1, BLOCK, fpSource)) > 0) {
        fwrite(buf, 1, size, fpDest);
    }

    printf("Copied %s to %s\n", source, dest); 

    fclose(fpSource);
    fclose(fpDest);

    return 0;
}

int main() {
    struct stat st;

    // Get source file from user
    char source[128];
    printf("Source file: ");
    scanf("%s", source);

    // Check if source file exists
    if (stat(source, &st) == -1) {
        fprintf(stderr, "Error: %s does not exist\n", source);
        return 1;
    }

    // Get dest file from user
    char dest[128];
    printf("Destination file: ");
    scanf("%s", dest);

    // Check if dest file exists
    if (stat(dest, &st) == 0) {
        fprintf(stderr, "Error: %s already exists\n", dest);
        return 2;
    }

    return cp(source, dest);
}