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 1.18 2015/09/16 17:58:25 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"

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

void
u_exec(char *argstr)
{
#define MAXARGLEN 20
	char	*args[MAXARGLEN], **ap = args;
	char	**end = &args[MAXARGLEN - 1], *tmp;
	char	*s = argstr;

	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);
	err(1, "%s", s);
}

char *
u_argv(char * const *argv)
{
	size_t	 siz = 0;
	int	 i;
	char	*p;

	if (argv == 0)
		return(NULL);

	for (i = 0; argv[i]; i++)
		siz += strlen(argv[i]) + 1;
	if (siz == 0)
		return(NULL);

	p = xmalloc(siz);
	strlcpy(p, argv[0], siz);
	for (i = 1; argv[i]; i++) {
		strlcat(p, " ", siz);
		strlcat(p, argv[i], siz);
	}
	return(p);
}