Initial import of the CDE 2.1.30 sources from the Open Group.

cde/programs/dtsession/SmScreen.c

@@ -0,0 +1,253 @@
+/* $XConsortium: SmScreen.c /main/4 1995/10/30 09:38:03 rswiston $ */
+/*                                                                      *
+ * (c) Copyright 1993, 1994 Hewlett-Packard Company                     *
+ * (c) Copyright 1993, 1994 International Business Machines Corp.       *
+ * (c) Copyright 1993, 1994 Sun Microsystems, Inc.                      *
+ * (c) Copyright 1993, 1994 Novell, Inc.                                *
+ */
+/*************************************<+>*************************************
+ *****************************************************************************
+ **
+ **  File:        SmScreen.c
+ **
+ **  Project:     DT Session Manager (dtsession)
+ **
+ **  Description:
+ **  -----------
+ **  This file contains all routines needed to manage external
+ **  screen savers.
+ **
+ *****************************************************************************
+ *************************************<+>*************************************/
+
+#include <stdio.h>
+#include <signal.h>
+#include <X11/Intrinsic.h>
+#include <X11/Xutil.h>
+#include <X11/Xatom.h>
+#include <Dt/Wsm.h>
+#include <Dt/UserMsg.h>
+#include <Dt/SaverP.h>
+#include "Sm.h"
+#include "SmUI.h"                  /* smDD.* */
+#include "SmError.h"
+#include "SmWindow.h"
+#include "SmProtocol.h"
+#include "SmGlobals.h"
+#include "SmScreen.h"
+
+/*
+ * Structures visible to this module only.
+ */
+typedef struct {
+  int count;
+  char *saver[1];   
+  /* variable length saver[] array */
+  /* saver command strings */
+} SmSaverParseStruct;
+
+/*
+ * Variables global to this module only
+ */
+static int savernum;             /* current screen saver number */
+static void *saverstate = NULL;  /* current running screen saver state */
+static int firsttime = 1;        /* first call to StartScreenSaver */
+
+/*
+ * Local Function declarations
+ */
+static void ParseSaverList(char *, int *, int *, SmSaverParseStruct *);
+
+
+
+/*************************************<->*************************************
+ *
+ *  StartScreenSaver ()
+ *
+ *
+ *  Description:
+ *  -----------
+ *  Start an external screen saver.
+ *
+ *  Inputs:
+ *  ------
+ *
+ * 
+ *  Outputs:
+ *  -------
+ *
+ *  Comments:
+ *  --------
+ * 
+ *************************************<->***********************************/
+
+void
+StartScreenSaver( void )
+{
+  int i;
+  SmSaverParseStruct *parse;
+
+  if (!smGD.saverListParse)
+  {
+   /*
+    * Parse the screen saver list.
+    */
+    smGD.saverListParse = SmSaverParseSaverList(smGD.saverList);
+
+    if (!smGD.saverListParse)
+    {
+      return;
+    }
+    savernum = -1;
+  }
+
+  parse = (SmSaverParseStruct *)smGD.saverListParse;
+
+  if (parse->count == 0)
+  {
+    return;
+  }
+
+ /*
+  * Decide which saver number to use.
+  */
+  savernum = (savernum + 1) % parse->count;
+
+  if (firsttime)
+  {
+   /*
+    * Load actions database.
+    */
+    ProcessReloadActionsDatabase();
+    firsttime = 0;
+  }
+
+ /*
+  * Start screen saver. _DtSaverStop() must be called to terminate the
+  * screen saver.
+  */
+  saverstate = _DtSaverStart(smGD.display, smDD.coverDrawing,
+                  smGD.numSavedScreens, parse->saver[savernum],
+                  smGD.topLevelWid);
+
+}
+
+
+/*************************************<->*************************************
+ *
+ *  StopScreenSaver ()
+ *
+ *
+ *  Description:
+ *  -----------
+ *  Stop an external screen saver.
+ *
+ *  Inputs:
+ *  ------
+ *
+ * 
+ *  Outputs:
+ *  -------
+ *
+ *  Comments:
+ *  --------
+ * 
+ *************************************<->***********************************/
+void
+StopScreenSaver( void )
+{
+  if (saverstate)
+  {
+   /*
+    * Terminate screen saver.
+    */
+    _DtSaverStop(smGD.display, saverstate);
+    saverstate = NULL;
+  }
+}
+
+/*************************************<->*************************************
+ *
+ *  SmSaverParseSaverList()
+ *
+ *
+ *  Description:
+ *  -----------
+ *  Parse screen saver list into allocated buffer.
+ *
+ *  SaverLine = {SaverSpec|WhiteSpace}
+ *  SaverSpec = WhiteSpace Command WhiteSpace
+ *  Command = <valid action name>
+ *  WhiteSpace = {<space>|<horizontal tab>|<line feed>}
+ *
+ *  For example, a saverList resource might be specified as:
+ *    *saverList:   \n \
+ *       StartDtscreenSwarm      \n\
+ *       StartDtscreenQix        \n\
+ *       StartDtscreenLife
+ *
+ *  And be represented in memory as:
+ *    "StartDtscreenSwarm   \n StartDtscreenQix\n  StartDtscreenLife"
+ *
+ *
+ *  Inputs:
+ *  ------
+ *  saverList - pointer to screen saver list. This memory is not changed.
+ *
+ *  Outputs:
+ *  -------
+ *  none
+ *
+ *  Return:
+ *  -------
+ *  pointer to allocated memory containing parsed saver list
+ *
+ *  Comments:
+ *  --------
+ *
+ *************************************<->***********************************/
+
+void *
+SmSaverParseSaverList(
+  char *saverList)
+{
+   char tokenSep[] = " \n\t";
+   char * token;
+   int i = 0;
+   char * tmpStr;
+   int len = strlen(saverList);
+   int bytes = sizeof(int);
+   char *p;
+   SmSaverParseStruct *pstruct;
+
+   tmpStr = (char *)XtMalloc(len + 1);
+   memcpy(tmpStr, saverList, len+1);
+   token = strtok(tmpStr, tokenSep);
+   while(token != NULL)
+   {
+     i++;
+     bytes += sizeof(char *) + strlen(token) + 1;
+     token = strtok(NULL, tokenSep);
+   }
+
+   pstruct = (SmSaverParseStruct *)XtMalloc(bytes);
+
+   if (pstruct)
+   {
+     memcpy(tmpStr, saverList, len+1);
+     token = strtok(tmpStr, tokenSep);
+     pstruct->count = 0;
+     p = (char *)(pstruct->saver + i);
+
+     while(token != NULL)
+     {
+       pstruct->saver[pstruct->count] = p;
+       strcpy(pstruct->saver[pstruct->count], token);
+       p += strlen(token) + 1;
+       token = strtok(NULL, tokenSep);
+       pstruct->count++;
+     }
+   }
+   XtFree ((char *) tmpStr);
+   return((void *)pstruct);
+}