/* xsh_tee.c - xsh_tee */

#include 
#include 
#include 

/*------------------------------------------------------------------------
 * xsh_tee - shell command to copy stdin to a file and to stdout
 *------------------------------------------------------------------------
 */
shellcmd xsh_tee(int nargs, char *args[])
{
        int32   nextch;                 /* Character read from file     */
        did32   descr;                  /* Descriptor for a file        */


        /* For argument '--help', emit help about the 'tee' command     */

        if (nargs != 2 && strncmp(args[1], "--help", 7) == 0) {
                fprintf(stderr,"Use: %s file\n\n", args[0]);
                fprintf(stderr,"Description:\n");
                fprintf(stderr,"\tcopies stdin to stdout and a file\n");
                fprintf(stderr,"Options:\n");
                fprintf(stderr,"\t--help\t display this help and exit\n");
                return 0;
        }

        descr = open(NAMESPACE, args[1], "w");
        if (descr == (did32)SYSERR) {
                fprintf(stderr, "%s: cannot open file %s\n",
                        args[0], args[1]);
                        return 1;
        }
        control(descr, F_CTL_TRUNC, 0, 0);
        nextch = getc(stdin);
        while (nextch != EOF) {
                putc(stdout, nextch);
                putc(descr, nextch);
                nextch = getc(stdin);
        }
        close(descr);
        return 0;
}