docmd(
	const char *cmdline
	)
{
	char *tokens[1+MAXARGS+2];
	struct parse pcmd;
	int ntok;
	static int i;
	struct xcmd *xcmd;

	/*
	 * Tokenize the command line.  If nothing on it, return.
	 */
	tokenize(cmdline, tokens, &ntok);
	if (ntok == 0)
	    return;

	/*
	 * Find the appropriate command description.
	 */
	i = findcmd(tokens[0], builtins, opcmds, &xcmd);
	if (i == 0) {
		(void) fprintf(stderr, "***Command `%s' unknown\n",
			       tokens[0]);
		return;
	} else if (i >= 2) {
		(void) fprintf(stderr, "***Command `%s' ambiguous\n",
			       tokens[0]);
		return;
	}

	/* Warn about ignored extra args */
	for (i = MAXARGS + 1; i < ntok ; ++i) {
		fprintf(stderr, "***Extra arg `%s' ignored\n", tokens[i]);
	}

	/*
	 * Save the keyword, then walk through the arguments, interpreting
	 * as we go.
	 */
	pcmd.keyword = tokens[0];
	pcmd.nargs = 0;
	for (i = 0; i < MAXARGS && xcmd->arg[i] != NO; i++) {
		if ((i+1) >= ntok) {
			if (!(xcmd->arg[i] & OPT)) {
				printusage(xcmd, stderr);
				return;
			}
			break;
		}
		if ((xcmd->arg[i] & OPT) && (*tokens[i+1] == '>'))
			break;
		if (!getarg(tokens[i+1], (int)xcmd->arg[i], &pcmd.argval[i]))
			return;
		pcmd.nargs++;
	}

	i++;
	if (i < ntok && *tokens[i] == '>') {
		char *fname;

		if (*(tokens[i]+1) != '\0')
			fname = tokens[i]+1;
		else if ((i+1) < ntok)
			fname = tokens[i+1];
		else {
			(void) fprintf(stderr, "***No file for redirect\n");
			return;
		}

		current_output = fopen(fname, "w");
		if (current_output == NULL) {
			(void) fprintf(stderr, "***Error opening %s: ", fname);
			perror("");
			return;
		}
		i = 1;		/* flag we need a close */
	} else {
		current_output = stdout;
		i = 0;		/* flag no close */
	}

	if (interactive && setjmp(interrupt_buf)) {
		jump = 0;
		return;
	} else {
		jump++;
		(xcmd->handler)(&pcmd, current_output);
		jump = 0;	/* HMS: 961106: was after fclose() */
		if (i) (void) fclose(current_output);
	}

	return;
}
Unknown