fcopy.c

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/* 
 * FCOPY.C - copy one file to another.  Returns the (positive)
 *           number of bytes copied, or -1 if an error occurred.
 * by: Bob Jarvis
 */

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

#define BUFFER_SIZE 1024

long fcopy(char *dest, char *source)
{
        FILE *d, *s;
        char *buffer;
        size_t incount;
        long totcount = 0L;

        s = fopen(source, "rb");
        if(s == NULL)
                return -1L;

        d = fopen(dest, "wb");
        if(d == NULL)
        {
                fclose(s);
                return -1L;
        }

        buffer = malloc(BUFFER_SIZE);
        if(buffer == NULL)
        {
                fclose(s);
                fclose(d);
                return -1L;
        }

        incount = fread(buffer, sizeof(char), BUFFER_SIZE, s);

        while(!feof(s))
        {
                totcount += (long)incount;
                fwrite(buffer, sizeof(char), incount, d);
                incount = fread(buffer, sizeof(char), BUFFER_SIZE, s);
        }

        totcount += (long)incount;
        fwrite(buffer, sizeof(char), incount, d);

        free(buffer);
        fclose(s);
        fclose(d);

        return totcount;
}