LibertyBSD_xenocara/xenocara/app/cwm/util.c

/*
 * calmwm - the calm window manager
 *
 * Copyright (c) 2004 Marius Aamodt Eriksen <marius@monkey.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * $OpenBSD: util.c,v 1.17 2015/01/19 14:54:16 okan Exp $
 */

#include <sys/types.h>
#include <sys/queue.h>

#include <err.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "calmwm.h"

#define MAXARGLEN 20

void
u_spawn(char *argstr)
{
	switch (fork()) {
	case 0:
		u_exec(argstr);
		err(1, "%s", argstr);
		break;
	case -1:
		warn("fork");
	default:
		break;
	}
}

void
u_exec(char *argstr)
{
	char	*args[MAXARGLEN], **ap = args;
	char	**end = &args[MAXARGLEN - 1], *tmp;

	while (ap < end && (*ap = strsep(&argstr, " \t")) != NULL) {
		if (**ap == '\0')
			continue;
		ap++;
		if (argstr != NULL) {
			/* deal with quoted strings */
			switch(argstr[0]) {
			case '"':
			case '\'':
				if ((tmp = strchr(argstr + 1, argstr[0]))
				    != NULL) {
					*(tmp++) = '\0';
					*(ap++) = ++argstr;
					argstr = tmp;
				}
				break;
			default:
				break;
			}
		}
	}

	*ap = NULL;
	(void)setsid();
	(void)execvp(args[0], args);
}