/*
 * This module implements g23sh user command dispatch.
 */

#include <sys/types.h>
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <stdlib.h>

extern char usercmd[];

extern void cmd_sendsp();

void
cmd_exit()
{
	tty_cleanup();
	exit(0);
}

static struct cmdtab {
	char *cmd;
	int minargs;
	int maxargs;
	void (*func)();
} cmdtab[] = {
	{"exit", 0, 0, cmd_exit},
	{"quit", 0, 0, cmd_exit},
	{"sp", 2, 2, cmd_sendsp},
	{0, 0, 0, 0}
};

void
dispatch_user_cmd()
{
	char *argv[10];
	char *cp, **ap;
	struct cmdtab *tp;

	for (cp = usercmd; isspace(*cp); cp++)
		;
	if (!*cp || *cp == '#')
		return;
	argv[0] = cp;
	while (*cp && !isspace(*cp))
		cp++;
	if (*cp)
		*cp++ = '\0';
	for (tp = cmdtab; tp->cmd; tp++)
		if (!strcmp(tp->cmd, argv[0]))
			break;
	if (!tp->func) {
		printf("error: no such command\n");
		return;
	}
	for (ap = argv + 1; ; ) {
		while (isspace(*cp))
			cp++;
		if (!*cp || *cp == '#')
			break;
		if (ap - argv - 1 >= tp->maxargs) {
			printf("error: too many arguments\n");
			return;
		}
		if (*cp == '"') {
			*ap++ = ++cp;
			while (*cp && *cp != '"')
				cp++;
			if (*cp != '"') {
				printf("error: unterminated quoted string\n");
				return;
			}
			*cp++ = '\0';
		} else {
			*ap++ = cp;
			while (*cp && !isspace(*cp))
				cp++;
			if (*cp)
				*cp++ = '\0';
		}
	}
	if (ap - argv - 1 < tp->minargs) {
		printf("error: too few arguments\n");
		return;
	}
	*ap = 0;
	tp->func(ap - argv, argv);
}