155 lines
4.1 KiB
C
155 lines
4.1 KiB
C
/*
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* CDE - Common Desktop Environment
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*
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* Copyright (c) 1993-2012, The Open Group. All rights reserved.
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*
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* These libraries and programs are free software; you can
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* redistribute them and/or modify them under the terms of the GNU
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* Lesser General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* These libraries and programs are distributed in the hope that
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* they will be useful, but WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU Lesser General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with these librararies and programs; if not, write
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* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
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* Floor, Boston, MA 02110-1301 USA
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*/
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/****************************<+>*************************************
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********************************************************************
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**
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** File: Environ_c.c
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**
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** $XConsortium: Environ_c.c /main/6 1995/12/18 16:31:33 cde-hp $
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**
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** Project: libCliSrv Library
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**
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** Description: Return the value of the DTUSERSESSION environ-
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** ment variable or create it if it doesn't exist.
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** If malloc fails, NULL is returned.
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**
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**(c) Copyright 1992,1993,1994 by Hewlett-Packard Company
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**(c) Copyright 1993,1994 International Business Machines Corp.
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**(c) Copyright 1993,1994 Sun Microsystems, Inc.
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**(c) Copyright 1993,1994 Unix System Labs, Inc., a subsidiary of Novell, Inc.
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**
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********************************************************************
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****************************<+>*************************************/
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#include <ctype.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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char * _DtCliSrvGetDtUserSession()
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{
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char * envVar = getenv("DTUSERSESSION");
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char * ret_envVar = NULL;
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/* See if the environment variable exists */
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if (envVar == NULL) {
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/* It doesn't, so it needs to be constructed. Use LOGNAME, which
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* always seems to be set, and DISPLAY, which may or may not be
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* set.
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*/
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char pipedata[BUFSIZ];
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char logname_local[8];
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char * logname = getenv("LOGNAME");
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if (logname == NULL) {
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strcpy(logname_local,"generic");
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logname = logname_local;
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}
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/* determine DISPLAY and screen number */
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{
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char screen[BUFSIZ];
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char * display = NULL;
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char * localDisplayVar = getenv("DISPLAY");
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if (localDisplayVar == NULL) {
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/* run uname to get the display name */
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FILE *pp;
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display = pipedata;
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pp = popen("uname -n", "r");
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if (NULL == pp) {
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perror("uname -n");
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return NULL;
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}
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*display = 0;
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fgets(display, BUFSIZ, pp);
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while (isspace(display[strlen(display)-1]))
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display[strlen(display)-1] = 0;
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pclose(pp);
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}
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else {
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display = malloc(strlen(localDisplayVar) + 1);
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strcpy(display, localDisplayVar);
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}
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/* Now determine the screen number. Throw away .0 */
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{
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char * s = strchr(display,':');
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if (s && strlen(s) < (size_t)BUFSIZ) {
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strcpy(screen,s+1);
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*s = 0;
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if ((s = strchr(screen,'.')) && *(s+1) == '0')
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*s = 0;
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}
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else {
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strcpy(screen,"0");
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}
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}
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envVar = malloc(strlen(logname) + strlen(display) + strlen(screen) + 3);
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if (envVar)
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sprintf (envVar, "%s-%s-%s", logname, display, screen);
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return envVar;
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}
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}
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ret_envVar = malloc(strlen(envVar) + 1);
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if (ret_envVar)
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strcpy(ret_envVar, envVar);
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return ret_envVar;
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}
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#ifdef TEST
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int main ()
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{
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char * value;
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value = _DtCliSrvGetDtUserSession();
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printf("DTUSERSESSION will be set to: %s\n", value);
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free(value);
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printf("value has been freed\n");
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}
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/*******************************************************
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Test cases: DTUSERSESSION LOGNAME DISPLAY
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-------------------------------------------------
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set - -
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unset userfoo unset
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unset userfoo hostname:0
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unset userfoo hostname:0.0
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unset userfoo hostname:0.1
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********************************************************/
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#endif
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