#include <stdio.h>

/* cat:  concatenate files, version 1 */
main(int argc, char *argv[])
{
    FILE *fp;
    void filecopy(FILE *, FILE *);

    if (argc == 1)  /* no args; copy standard input */
        filecopy(stdin, stdout);
    else
        while (--argc > 0)
            if ((fp = fopen(*++argv, "r")) == NULL) {
                printf("cat: can't open %s\n", *argv);
                return 1;
            } else {
                filecopy(fp, stdout);
                fclose(fp);
            }
    return 0;
}