/* xsh_cat.c - xsh_cat */

#include 
#include 
#include 

/*------------------------------------------------------------------------
 * xsh_cat - shell command to cat one or more files
 *------------------------------------------------------------------------
 */
shellcmd xsh_cat(int nargs, char *args[])
{
        int32   i;                      /* Index into proctabl          */
        int32   nextch;                 /* Character read from file     */
        did32   descr;                  /* Descriptor for a file        */
        char    *argptr;                /* Pointer to next arg string   */


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

        if (nargs == 2 && strncmp(args[1], "--help", 7) == 0) {
                printf("Use: %s [file...]\n\n", args[0]);
                printf("Description:\n");
                printf("\twrites contents of files or stdin to stdout\n");
                printf("Options:\n");
                printf("\tfile...\tzero or more file names\n");
                printf("\t--help\t display this help and exit\n");
                return 0;
        }

        if (nargs == 1) {
                nextch = getc(stdin);
                while (nextch != EOF) {
                        putc(stdout, nextch);
                        nextch = getc(stdin);
                }
                return 0;
        }
        for (i = 1; i < nargs; i++) {
                argptr = args[i];
                if ( (argptr[0] == '-') && (argptr[1] == NULLCH) ) {
                        descr = stdin;
                } else {
                        descr = open(NAMESPACE, argptr, "ro");
                        if (descr == (did32)SYSERR) {
                                fprintf(stderr, "%s: cannot open file %s\n",
                                        args[0], argptr);
                                return 1;
                        }
                }
                nextch = getc(descr);
                while (nextch != EOF) {
                        putc(stdout, nextch);
                        nextch = getc(descr);
                }
                close(descr);
        }
        return 0;
}