/* $XConsortium: util.c,v 1.18 94/11/21 18:33:11 kaleb Exp $ */
/* $XFree86: xc/programs/xdm/util.c,v 3.7.4.1 1998/10/04 13:37:23 hohndel Exp $ */
/*

Copyright (c) 1989  X Consortium

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of the X Consortium shall
not be used in advertising or otherwise to promote the sale, use or
other dealings in this Software without prior written authorization
from the X Consortium.

*/

/*
 * xdm - display manager daemon
 * Author:  Keith Packard, MIT X Consortium
 *
 * util.c
 *
 * various utility routines
 */

# include   "dm.h"
#ifdef X_POSIX_C_SOURCE
#define _POSIX_C_SOURCE X_POSIX_C_SOURCE
#include <signal.h>
#undef _POSIX_C_SOURCE
#else
#if defined(X_NOT_POSIX) || defined(_POSIX_SOURCE)
#include <signal.h>
#else
#define _POSIX_SOURCE
#include <signal.h>
#undef _POSIX_SOURCE
#endif
#endif
#if defined(__osf__) || defined(linux) || defined(MINIX)
#define setpgrp setpgid
#endif

printEnv (e)
char	**e;
{
	while (*e)
		Debug ("%s\n", *e++);
}

static char *
makeEnv (name, value)
char	*name;
char	*value;
{
	char	*result;

	result = malloc ((unsigned) (strlen (name) + strlen (value) + 2));
	if (!result) {
		LogOutOfMem ("makeEnv");
		return 0;
	}
	sprintf (result, "%s=%s", name, value);
	return result;
}

char *
getEnv (e, name)
	char	**e;
	char	*name;
{
	int	l = strlen (name);

	if (!e) return 0;

	while (*e) {
		if ((int)strlen (*e) > l && !strncmp (*e, name, l) &&
			(*e)[l] == '=')
			return (*e) + l + 1;
		++e;
	}
	return 0;
}

char **
setEnv (e, name, value)
	char	**e;
	char	*name;
	char	*value;
{
	char	**new, **old;
	char	*newe;
	int	envsize;
	int	l;

	l = strlen (name);
	newe = makeEnv (name, value);
	if (!newe) {
		LogOutOfMem ("setEnv");
		return e;
	}
	if (e) {
		for (old = e; *old; old++)
			if ((int)strlen (*old) > l && !strncmp (*old, name, l) && (*old)[l] == '=')
				break;
		if (*old) {
			free (*old);
			*old = newe;
			return e;
		}
		envsize = old - e;
		new = (char **) realloc ((char *) e,
				(unsigned) ((envsize + 2) * sizeof (char *)));
	} else {
		envsize = 0;
		new = (char **) malloc (2 * sizeof (char *));
	}
	if (!new) {
		LogOutOfMem ("setEnv");
		free (newe);
		return e;
	}
	new[envsize] = newe;
	new[envsize+1] = 0;
	return new;
}

freeEnv (env)
    char    **env;
{
    char    **e;

    if (env)
    {
    	for (e = env; *e; e++)
	    free (*e);
    	free (env);
    }
}

# define isblank(c)	((c) == ' ' || c == '\t')

char **
parseArgs (argv, string)
char	**argv;
char	*string;
{
	char	*word;
	char	*save;
	char    **newargv;
	int	i;

	i = 0;
	while (argv && argv[i])
		++i;
	if (!argv) {
		argv = (char **) malloc (sizeof (char *));
		if (!argv) {
			LogOutOfMem ("parseArgs");
			return 0;
		}
	}
	word = string;
	for (;;) {
		if (!*string || isblank (*string)) {
			if (word != string) {
				newargv = (char **) realloc ((char *) argv,
					(unsigned) ((i + 2) * sizeof (char *)));
				save = malloc ((unsigned) (string - word + 1));
				if (!newargv || !save) {
					LogOutOfMem ("parseArgs");
					free ((char *) argv);
					if (save)
						free (save);
					return 0;
				} else {
				    argv = newargv;
				}
				argv[i] = strncpy (save, word, string-word);
				argv[i][string-word] = '\0';
				i++;
			}
			if (!*string)
				break;
			word = string + 1;
		}
		++string;
	}
	argv[i] = 0;
	return argv;
}

freeArgs (argv)
    char    **argv;
{
    char    **a;

    if (!argv)
	return;

    for (a = argv; *a; a++)
	free (*a);
    free ((char *) argv);
}

CleanUpChild ()
{
#ifdef CSRG_BASED
	setsid();
#else
#if defined(SYSV) || defined(SVR4)
#if !(defined(SVR4) && defined(i386)) || defined(SCO325)
	setpgrp ();
#endif
#else
	setpgrp (0, getpid ());
#ifdef MINIX /* actually POSIX */
	{
		sigset_t ss; 
		sigemptyset(&ss);
		sigprocmask(SIG_SETMASK, &ss, NULL);
	}
#else
	sigsetmask (0);
#endif
#endif
#endif
#ifdef SIGCHLD
	(void) Signal (SIGCHLD, SIG_DFL);
#endif
	(void) Signal (SIGTERM, SIG_DFL);
	(void) Signal (SIGPIPE, SIG_DFL);
	(void) Signal (SIGALRM, SIG_DFL);
	(void) Signal (SIGHUP, SIG_DFL);
	CloseOnFork ();
}

static char localHostbuf[256];
static int  gotLocalHostname;

char *
localHostname ()
{
    if (!gotLocalHostname)
    {
	XmuGetHostname (localHostbuf, sizeof (localHostbuf) - 1);
	gotLocalHostname = 1;
    }
    return localHostbuf;
}

SIGVAL (*Signal (sig, handler))()
    int sig;
    SIGVAL (*handler)();
{
#if !defined(X_NOT_POSIX) && !defined(__EMX__)
    struct sigaction sigact, osigact;
    sigact.sa_handler = handler;
    sigemptyset(&sigact.sa_mask);
    sigact.sa_flags = 0;
    sigaction(sig, &sigact, &osigact);
    return osigact.sa_handler;
#else
    return signal(sig, handler);
#endif
}
