1 files changed, 106 insertions, 0 deletions
diff --git a/xnest-plugin/XnestDis.c b/xnest-plugin/XnestDis.c
new file mode 100644
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--- /dev/null
+++ b/xnest-plugin/XnestDis.c
@@ -0,0 +1,106 @@
+/* $Xorg: XnestDis.c,v 1.4 2001/02/09 02:05:58 xorgcvs Exp $ */
+/*
+
+Copyright 1996, 1998  The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+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 MERCHANTABIL-
+ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT
+SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABIL-
+ITY, 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 Open Group 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 Open Group.
+
+*/
+
+#include "RxPlugin.h"
+
+/***********************************************************************
+ * Utility functions and global variable to manage display numbers
+ ***********************************************************************/
+
+/* maximum numbers of concurrent instances */
+#define MAX_PLUGINS 10
+
+/* start from 5 to avoid possible conflict with multi-display X server */
+#define XNEST_OFFSET 5
+
+/* global allowing to know which display numbers are in use */
+static int16 xnest_display_numbers[MAX_PLUGINS];
+
+void
+RxpInitXnestDisplayNumbers()
+{
+    memset(xnest_display_numbers, 0, sizeof(int16) * MAX_PLUGINS);
+}
+
+/* function returning first display number available */
+int
+RxpXnestDisplayNumber()
+{
+    int i;
+    for (i = 0; i < MAX_PLUGINS; i++)
+	if (xnest_display_numbers[i] == 0) {
+	    xnest_display_numbers[i] = 1;
+	    return i + XNEST_OFFSET;
+	}
+    /* no more available */
+    return -1;
+}
+
+/* function returning first display number available */
+void
+RxpFreeXnestDisplayNumber(int i)
+{
+    xnest_display_numbers[i - XNEST_OFFSET] = 0;
+}
+
+/* function returning display name with specified display number */
+char *
+RxpXnestDisplay(int display_number)
+{
+    static char name[1024];
+    char *display_name, *dpy_name, *display_num, *screen_num;
+
+    display_name = getenv("DISPLAY");
+    if (display_name == NULL)
+	return NULL;
+
+    /* if of the form x11:display skip scheme part */
+    if (strncmp(display_name, "x11:", 4) == 0)
+	dpy_name = display_name + 4;
+    else
+	dpy_name = display_name;
+
+    /* display number is after next ":" character */
+    display_num = strchr(dpy_name, ':');
+    if (display_num == NULL)	/* invalid display specification */
+	return NULL;
+
+    /* copy display name up to the display number */
+    strncpy(name, display_name, display_num - display_name);
+
+    /* override display_number */
+    sprintf(name + (display_num - display_name), ":%d", display_number);
+
+    /* append screen number */
+    screen_num = strchr(display_num, '.');
+    if (screen_num != NULL)
+	strcat(name, screen_num);
+
+    return name;
+}