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

int main(int argc, char *argv[])
{
        FILE *fps, *fpd;
        void *buf;
        int rcount, wcount;

        if (argc != 3) {
                printf("Usage: %s src_file dst_file\n", argv[0]);
                exit(1);
        }

        fps = fopen(argv[1], "r");
        if (fps == NULL) {
                perror(argv[1]);
                exit(1);
        }

        fpd = fopen(argv[2], "w");
        if (fpd == NULL) {
                perror(argv[2]);
                fclose(fps);
                exit(1);
        }

        buf = malloc(BUFSIZ);
        if (buf == NULL) {
                perror("malloc");
                fclose(fpd);
                fclose(fps);
                exit(1);
        }

        while (!feof(fps)) {
                rcount = fread(buf, 1, BUFSIZ, fps);
                if (ferror(fps)) {
                        perror("fread");
                        free(buf);
                        fclose(fpd);
                        fclose(fps);
                        exit(1);
                }

                wcount = fwrite(buf, 1, rcount, fpd);
                if (ferror(fpd)) {
                        perror("fwrite");
                        fprintf(stderr, "tried to write %d bytes, "
                                "but only %d bytes were written.\n",
                                rcount, wcount);
                        free(buf);
                        fclose(fpd);
                        fclose(fps);
                        exit(1);
                }
        }

        free(buf);
        fclose(fpd);
        fclose(fps);

        return 0;
}