1 files changed, 442 insertions, 442 deletions
diff --git a/xorg-server/hw/xfree86/loader/loadext.c b/xorg-server/hw/xfree86/loader/loadext.c
index 29cdaf1ac..26066856d 100644
--- a/xorg-server/hw/xfree86/loader/loadext.c
+++ b/xorg-server/hw/xfree86/loader/loadext.c
@@ -1,442 +1,442 @@
-/*
- * Copyright (c) 2000 by The XFree86 Project, Inc.
- *
- * 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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 copyright holder(s)
- * and author(s) 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 copyright holder(s) and author(s).
- */
-
-/* Maybe this file belongs elsewhere? */
-
-#define LOADERDECLARATIONS
-#ifdef HAVE_XORG_CONFIG_H
-#include <xorg-config.h>
-#endif
-
-#include "loaderProcs.h"
-#include "misc.h"
-#include "xf86.h"
-
-/*
- * This should be static, but miinitext wants it.  FIXME: make extension
- * initialization not completely terrible.
- */
-ExtensionModule *ExtensionModuleList = NULL;
-static int numExtensionModules = 0;
-
-static ExtensionModule *
-NewExtensionModule(void)
-{
-    ExtensionModule *save = ExtensionModuleList;
-    int n;
-
-    /* Sanity check */
-    if (!ExtensionModuleList)
-	numExtensionModules = 0;
-
-    n = numExtensionModules + 1;
-    ExtensionModuleList = xrealloc(ExtensionModuleList,
-				   (n + 1) * sizeof(ExtensionModule));
-    if (ExtensionModuleList == NULL) {
-	ExtensionModuleList = save;
-	return NULL;
-    } else {
-	numExtensionModules++;
-	ExtensionModuleList[numExtensionModules].name = NULL;
-	return ExtensionModuleList + (numExtensionModules - 1);
-    }
-}
-
-void
-LoadExtension(ExtensionModule * e, Bool builtin)
-{
-    ExtensionModule *newext;
-
-    if (e == NULL || e->name == NULL)
-	return;
-
-    if (!(newext = NewExtensionModule()))
-	return;
-
-    if (builtin)
-	xf86MsgVerb(X_INFO, 2, "Initializing built-in extension %s\n",
-		    e->name);
-    else
-	xf86MsgVerb(X_INFO, 2, "Loading extension %s\n", e->name);
-
-    newext->name = e->name;
-    newext->initFunc = e->initFunc;
-    newext->disablePtr = e->disablePtr;
-    newext->setupFunc = e->setupFunc;
-    newext->initDependencies = e->initDependencies;
-
-    if (e->setupFunc != NULL)
-	e->setupFunc();
-}
-
-/*
- * Sort ExtensionModuleList according to the initialisation order
- * dependencies.  The code for this is taken from BSD's tsort,
- * and carries the following copyright/license:
- *
- *
- * Copyright (c) 1989, 1993, 1994
- *      The Regents of the University of California.  All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Michael Rendell of Memorial University of Newfoundland.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- *    must display the following acknowledgement:
- *      This product includes software developed by the University of
- *      California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#define	NF_MARK		0x1	/* marker for cycle detection */
-#define	NF_ACYCLIC	0x2	/* this node is cycle free */
-#define	NF_NODEST	0x4	/* Unreachable */
-
-typedef struct node_str NODE;
-struct node_str {
-    NODE **n_prevp;		/* pointer to previous node's n_next */
-    NODE *n_next;		/* next node in graph */
-    NODE **n_arcs;		/* array of arcs to other nodes */
-    int n_narcs;		/* number of arcs in n_arcs[] */
-    int n_arcsize;		/* size of n_arcs[] array */
-    int n_refcnt;		/* # of arcs pointing to this node */
-    int n_flags;		/* NF_* */
-    const char *n_name;		/* name of this node */
-};
-
-static NODE *graph = NULL, **cycle_buf = NULL, **longest_cycle = NULL;
-static int longest = 0;
-static NODE *sorted = NULL, *last = NULL;
-
-/* Find a node in the graph (insert if not found) and return a pointer to it. */
-static NODE *
-get_node(const char *name)
-{
-    NODE *n;
-
-    for (n = graph; n && n->n_name && strcmp(n->n_name, name);
-	 n = n->n_next) ;
-    if (n)
-	return (n);
-
-    n = xnfalloc(sizeof(NODE));
-
-    n->n_narcs = 0;
-    n->n_arcsize = 0;
-    n->n_arcs = NULL;
-    n->n_refcnt = 0;
-    n->n_flags = 0;
-    n->n_name = name;
-
-    /* Add to linked list. */
-    if ((n->n_next = graph) != NULL)
-	graph->n_prevp = &n->n_next;
-    n->n_prevp = &graph;
-    graph = n;
-
-    return (n);
-}
-
-/*
- * add an arc from node s1 to node s2 in the graph.  If s1 or s2 are not in
- * the graph, then add them.
- */
-static void
-add_arc(const char *s1, const char *s2)
-{
-    NODE *n1;
-    NODE *n2;
-    int bsize, i;
-
-    n1 = get_node(s1);
-
-    if (!strcmp(s1, s2))
-	return;
-
-    n2 = get_node(s2);
-
-    /*
-     * Check if this arc is already here.
-     */
-    for (i = 0; i < n1->n_narcs; i++)
-	if (n1->n_arcs[i] == n2)
-	    return;
-    /*
-     * Add it.
-     */
-    if (n1->n_narcs == n1->n_arcsize) {
-	if (!n1->n_arcsize)
-	    n1->n_arcsize = 10;
-	bsize = n1->n_arcsize * sizeof(*n1->n_arcs) * 2;
-	n1->n_arcs = xnfrealloc(n1->n_arcs, bsize);
-	n1->n_arcsize = bsize / sizeof(*n1->n_arcs);
-    }
-    n1->n_arcs[n1->n_narcs++] = n2;
-    ++n2->n_refcnt;
-}
-
-/*
- * Clear the NODEST flag from all nodes.
- */
-static void
-clear_cycle(void)
-{
-    NODE *n;
-
-    for (n = graph; n != NULL; n = n->n_next)
-	n->n_flags &= ~NF_NODEST;
-}
-
-/* print node and remove from graph (does not actually free node) */
-static void
-remove_node(NODE * n)
-{
-    NODE **np;
-    NODE *newnode;
-    int i;
-
-#ifdef DEBUG
-    ErrorF("%s\n", n->n_name);
-#endif
-    newnode = xnfalloc(sizeof(NODE));
-    memcpy(newnode, n, sizeof(NODE));
-    if (last)
-	last->n_next = newnode;
-    else
-	sorted = newnode;
-    last = newnode;
-    newnode->n_next = NULL;
-
-    for (np = n->n_arcs, i = n->n_narcs; --i >= 0; np++)
-	--(*np)->n_refcnt;
-    n->n_narcs = 0;
-    *n->n_prevp = n->n_next;
-    if (n->n_next)
-	n->n_next->n_prevp = n->n_prevp;
-}
-
-static void
-free_nodes(NODE * nodelist)
-{
-    NODE *n, *nextnode;
-
-    for (n = nodelist; n;) {
-	nextnode = n->n_next;
-	xfree(n);
-	n = nextnode;
-    }
-}
-
-/* look for the longest? cycle from node from to node to. */
-static int
-find_cycle(NODE * from, NODE * to, int longest_len, int depth)
-{
-    NODE **np;
-    int i, len;
-
-    /*
-     * avoid infinite loops and ignore portions of the graph known
-     * to be acyclic
-     */
-    if (from->n_flags & (NF_NODEST | NF_MARK | NF_ACYCLIC))
-	return (0);
-    from->n_flags |= NF_MARK;
-
-    for (np = from->n_arcs, i = from->n_narcs; --i >= 0; np++) {
-	cycle_buf[depth] = *np;
-	if (*np == to) {
-	    if (depth + 1 > longest_len) {
-		longest_len = depth + 1;
-		memcpy((char *)longest_cycle,
-		       (char *)cycle_buf, longest_len * sizeof(NODE *));
-	    }
-	} else {
-	    if ((*np)->n_flags & (NF_MARK | NF_ACYCLIC | NF_NODEST))
-		continue;
-	    len = find_cycle(*np, to, longest_len, depth + 1);
-
-#ifdef DEBUG
-	    ErrorF("%*s %s->%s %d\n", depth, "",
-		   from->n_name, to->n_name, len);
-#endif
-
-	    if (len == 0)
-		(*np)->n_flags |= NF_NODEST;
-
-	    if (len > longest_len)
-		longest_len = len;
-
-	    if (len > 0 && !longest)
-		break;
-	}
-    }
-    from->n_flags &= ~NF_MARK;
-    return (longest_len);
-}
-
-/* do topological sort on graph */
-static void
-tsort(void)
-{
-    NODE *n, *next;
-    int cnt, i;
-
-    while (graph != NULL) {
-	/*
-	 * Keep getting rid of simple cases until there are none left,
-	 * if there are any nodes still in the graph, then there is
-	 * a cycle in it.
-	 */
-	do {
-	    for (cnt = 0, n = graph; n != NULL; n = next) {
-		next = n->n_next;
-		if (n->n_refcnt == 0) {
-		    remove_node(n);
-		    ++cnt;
-		}
-	    }
-	} while (graph != NULL && cnt);
-
-	if (graph == NULL)
-	    break;
-
-	if (!cycle_buf) {
-	    /*
-	     * Allocate space for two cycle logs - one to be used
-	     * as scratch space, the other to save the longest
-	     * cycle.
-	     */
-	    for (cnt = 0, n = graph; n != NULL; n = n->n_next)
-		++cnt;
-	    cycle_buf = xnfalloc(sizeof(NODE *) * cnt);
-	    longest_cycle = xnfalloc(sizeof(NODE *) * cnt);
-	    if (cycle_buf == NULL || longest_cycle == NULL)
-		return;
-	}
-	for (n = graph; n != NULL; n = n->n_next)
-	    if (!(n->n_flags & NF_ACYCLIC)) {
-		if ((cnt = find_cycle(n, n, 0, 0))) {
-		    ErrorF("tsort: cycle in data");
-		    for (i = 0; i < cnt; i++)
-			ErrorF("%s", longest_cycle[i]->n_name);
-		    remove_node(n);
-		    clear_cycle();
-		    break;
-		} else {
-		    /* to avoid further checks */
-		    n->n_flags |= NF_ACYCLIC;
-		    clear_cycle();
-		}
-	    }
-
-	if (n == NULL)
-	    ErrorF("tsort: internal error -- could not find cycle");
-    }
-    if (cycle_buf)
-	xfree(cycle_buf);
-    if (longest_cycle)
-	xfree(longest_cycle);
-    if (graph)
-	free_nodes(graph);
-}
-
-void
-LoaderSortExtensions(void)
-{
-    int i, j;
-    ExtensionModule *ext, *newList;
-    NODE *node;
-
-    graph = NULL;
-    longest = 0;
-    sorted = NULL;
-    last = NULL;
-    cycle_buf = NULL;
-    longest_cycle = NULL;
-
-    /*
-     * Parse list and build the graph.  Enter them in reverse order
-     * because tsort() will reverse those that have no depedencies.
-     */
-    for (i = numExtensionModules - 1; i >= 0; i--) {
-	ext = &ExtensionModuleList[i];
-	add_arc(ext->name, ext->name);
-#ifdef DEBUG
-	ErrorF("Extension %s:\n", ext->name);
-#endif
-	if (ext->initDependencies)
-	    for (j = 0; ext->initDependencies[j]; j++) {
-		add_arc(ext->initDependencies[j], ext->name);
-#ifdef DEBUG
-		ErrorF("\t%s\n", ext->initDependencies[j]);
-#endif
-	    }
-    }
-    tsort();
-    newList = xnfalloc((numExtensionModules + 1) * sizeof(ExtensionModule));
-    i = 0;
-    for (node = sorted; node; node = node->n_next) {
-	for (j = 0; j < numExtensionModules; j++)
-	    if (!strcmp(node->n_name, ExtensionModuleList[j].name))
-		break;
-	if (j != numExtensionModules)
-	    newList[i++] = ExtensionModuleList[j];
-    }
-    if (sorted)
-	free_nodes(sorted);
-    if (graph)
-	free_nodes(graph);
-    newList[i].name = NULL;
-    xfree(ExtensionModuleList);
-    ExtensionModuleList = newList;
-#ifdef DEBUG
-    for (i = 0; ExtensionModuleList[i].name; i++)
-	ErrorF("Extension %s\n", ExtensionModuleList[i].name);
-#endif
-}
+/*
+ * Copyright (c) 2000 by The XFree86 Project, Inc.
+ *
+ * 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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 copyright holder(s)
+ * and author(s) 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 copyright holder(s) and author(s).
+ */
+
+/* Maybe this file belongs elsewhere? */
+
+#define LOADERDECLARATIONS
+#ifdef HAVE_XORG_CONFIG_H
+#include <xorg-config.h>
+#endif
+
+#include "loaderProcs.h"
+#include "misc.h"
+#include "xf86.h"
+
+/*
+ * This should be static, but miinitext wants it.  FIXME: make extension
+ * initialization not completely terrible.
+ */
+ExtensionModule *ExtensionModuleList = NULL;
+static int numExtensionModules = 0;
+
+static ExtensionModule *
+NewExtensionModule(void)
+{
+    ExtensionModule *save = ExtensionModuleList;
+    int n;
+
+    /* Sanity check */
+    if (!ExtensionModuleList)
+	numExtensionModules = 0;
+
+    n = numExtensionModules + 1;
+    ExtensionModuleList = realloc(ExtensionModuleList,
+				   (n + 1) * sizeof(ExtensionModule));
+    if (ExtensionModuleList == NULL) {
+	ExtensionModuleList = save;
+	return NULL;
+    } else {
+	numExtensionModules++;
+	ExtensionModuleList[numExtensionModules].name = NULL;
+	return ExtensionModuleList + (numExtensionModules - 1);
+    }
+}
+
+void
+LoadExtension(ExtensionModule * e, Bool builtin)
+{
+    ExtensionModule *newext;
+
+    if (e == NULL || e->name == NULL)
+	return;
+
+    if (!(newext = NewExtensionModule()))
+	return;
+
+    if (builtin)
+	xf86MsgVerb(X_INFO, 2, "Initializing built-in extension %s\n",
+		    e->name);
+    else
+	xf86MsgVerb(X_INFO, 2, "Loading extension %s\n", e->name);
+
+    newext->name = e->name;
+    newext->initFunc = e->initFunc;
+    newext->disablePtr = e->disablePtr;
+    newext->setupFunc = e->setupFunc;
+    newext->initDependencies = e->initDependencies;
+
+    if (e->setupFunc != NULL)
+	e->setupFunc();
+}
+
+/*
+ * Sort ExtensionModuleList according to the initialisation order
+ * dependencies.  The code for this is taken from BSD's tsort,
+ * and carries the following copyright/license:
+ *
+ *
+ * Copyright (c) 1989, 1993, 1994
+ *      The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Michael Rendell of Memorial University of Newfoundland.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by the University of
+ *      California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#define	NF_MARK		0x1	/* marker for cycle detection */
+#define	NF_ACYCLIC	0x2	/* this node is cycle free */
+#define	NF_NODEST	0x4	/* Unreachable */
+
+typedef struct node_str NODE;
+struct node_str {
+    NODE **n_prevp;		/* pointer to previous node's n_next */
+    NODE *n_next;		/* next node in graph */
+    NODE **n_arcs;		/* array of arcs to other nodes */
+    int n_narcs;		/* number of arcs in n_arcs[] */
+    int n_arcsize;		/* size of n_arcs[] array */
+    int n_refcnt;		/* # of arcs pointing to this node */
+    int n_flags;		/* NF_* */
+    const char *n_name;		/* name of this node */
+};
+
+static NODE *graph = NULL, **cycle_buf = NULL, **longest_cycle = NULL;
+static int longest = 0;
+static NODE *sorted = NULL, *last = NULL;
+
+/* Find a node in the graph (insert if not found) and return a pointer to it. */
+static NODE *
+get_node(const char *name)
+{
+    NODE *n;
+
+    for (n = graph; n && n->n_name && strcmp(n->n_name, name);
+	 n = n->n_next) ;
+    if (n)
+	return (n);
+
+    n = xnfalloc(sizeof(NODE));
+
+    n->n_narcs = 0;
+    n->n_arcsize = 0;
+    n->n_arcs = NULL;
+    n->n_refcnt = 0;
+    n->n_flags = 0;
+    n->n_name = name;
+
+    /* Add to linked list. */
+    if ((n->n_next = graph) != NULL)
+	graph->n_prevp = &n->n_next;
+    n->n_prevp = &graph;
+    graph = n;
+
+    return (n);
+}
+
+/*
+ * add an arc from node s1 to node s2 in the graph.  If s1 or s2 are not in
+ * the graph, then add them.
+ */
+static void
+add_arc(const char *s1, const char *s2)
+{
+    NODE *n1;
+    NODE *n2;
+    int bsize, i;
+
+    n1 = get_node(s1);
+
+    if (!strcmp(s1, s2))
+	return;
+
+    n2 = get_node(s2);
+
+    /*
+     * Check if this arc is already here.
+     */
+    for (i = 0; i < n1->n_narcs; i++)
+	if (n1->n_arcs[i] == n2)
+	    return;
+    /*
+     * Add it.
+     */
+    if (n1->n_narcs == n1->n_arcsize) {
+	if (!n1->n_arcsize)
+	    n1->n_arcsize = 10;
+	bsize = n1->n_arcsize * sizeof(*n1->n_arcs) * 2;
+	n1->n_arcs = xnfrealloc(n1->n_arcs, bsize);
+	n1->n_arcsize = bsize / sizeof(*n1->n_arcs);
+    }
+    n1->n_arcs[n1->n_narcs++] = n2;
+    ++n2->n_refcnt;
+}
+
+/*
+ * Clear the NODEST flag from all nodes.
+ */
+static void
+clear_cycle(void)
+{
+    NODE *n;
+
+    for (n = graph; n != NULL; n = n->n_next)
+	n->n_flags &= ~NF_NODEST;
+}
+
+/* print node and remove from graph (does not actually free node) */
+static void
+remove_node(NODE * n)
+{
+    NODE **np;
+    NODE *newnode;
+    int i;
+
+#ifdef DEBUG
+    ErrorF("%s\n", n->n_name);
+#endif
+    newnode = xnfalloc(sizeof(NODE));
+    memcpy(newnode, n, sizeof(NODE));
+    if (last)
+	last->n_next = newnode;
+    else
+	sorted = newnode;
+    last = newnode;
+    newnode->n_next = NULL;
+
+    for (np = n->n_arcs, i = n->n_narcs; --i >= 0; np++)
+	--(*np)->n_refcnt;
+    n->n_narcs = 0;
+    *n->n_prevp = n->n_next;
+    if (n->n_next)
+	n->n_next->n_prevp = n->n_prevp;
+}
+
+static void
+free_nodes(NODE * nodelist)
+{
+    NODE *n, *nextnode;
+
+    for (n = nodelist; n;) {
+	nextnode = n->n_next;
+	free(n);
+	n = nextnode;
+    }
+}
+
+/* look for the longest? cycle from node from to node to. */
+static int
+find_cycle(NODE * from, NODE * to, int longest_len, int depth)
+{
+    NODE **np;
+    int i, len;
+
+    /*
+     * avoid infinite loops and ignore portions of the graph known
+     * to be acyclic
+     */
+    if (from->n_flags & (NF_NODEST | NF_MARK | NF_ACYCLIC))
+	return (0);
+    from->n_flags |= NF_MARK;
+
+    for (np = from->n_arcs, i = from->n_narcs; --i >= 0; np++) {
+	cycle_buf[depth] = *np;
+	if (*np == to) {
+	    if (depth + 1 > longest_len) {
+		longest_len = depth + 1;
+		memcpy((char *)longest_cycle,
+		       (char *)cycle_buf, longest_len * sizeof(NODE *));
+	    }
+	} else {
+	    if ((*np)->n_flags & (NF_MARK | NF_ACYCLIC | NF_NODEST))
+		continue;
+	    len = find_cycle(*np, to, longest_len, depth + 1);
+
+#ifdef DEBUG
+	    ErrorF("%*s %s->%s %d\n", depth, "",
+		   from->n_name, to->n_name, len);
+#endif
+
+	    if (len == 0)
+		(*np)->n_flags |= NF_NODEST;
+
+	    if (len > longest_len)
+		longest_len = len;
+
+	    if (len > 0 && !longest)
+		break;
+	}
+    }
+    from->n_flags &= ~NF_MARK;
+    return (longest_len);
+}
+
+/* do topological sort on graph */
+static void
+tsort(void)
+{
+    NODE *n, *next;
+    int cnt, i;
+
+    while (graph != NULL) {
+	/*
+	 * Keep getting rid of simple cases until there are none left,
+	 * if there are any nodes still in the graph, then there is
+	 * a cycle in it.
+	 */
+	do {
+	    for (cnt = 0, n = graph; n != NULL; n = next) {
+		next = n->n_next;
+		if (n->n_refcnt == 0) {
+		    remove_node(n);
+		    ++cnt;
+		}
+	    }
+	} while (graph != NULL && cnt);
+
+	if (graph == NULL)
+	    break;
+
+	if (!cycle_buf) {
+	    /*
+	     * Allocate space for two cycle logs - one to be used
+	     * as scratch space, the other to save the longest
+	     * cycle.
+	     */
+	    for (cnt = 0, n = graph; n != NULL; n = n->n_next)
+		++cnt;
+	    cycle_buf = xnfalloc(sizeof(NODE *) * cnt);
+	    longest_cycle = xnfalloc(sizeof(NODE *) * cnt);
+	    if (cycle_buf == NULL || longest_cycle == NULL)
+		return;
+	}
+	for (n = graph; n != NULL; n = n->n_next)
+	    if (!(n->n_flags & NF_ACYCLIC)) {
+		if ((cnt = find_cycle(n, n, 0, 0))) {
+		    ErrorF("tsort: cycle in data");
+		    for (i = 0; i < cnt; i++)
+			ErrorF("%s", longest_cycle[i]->n_name);
+		    remove_node(n);
+		    clear_cycle();
+		    break;
+		} else {
+		    /* to avoid further checks */
+		    n->n_flags |= NF_ACYCLIC;
+		    clear_cycle();
+		}
+	    }
+
+	if (n == NULL)
+	    ErrorF("tsort: internal error -- could not find cycle");
+    }
+    if (cycle_buf)
+	free(cycle_buf);
+    if (longest_cycle)
+	free(longest_cycle);
+    if (graph)
+	free_nodes(graph);
+}
+
+void
+LoaderSortExtensions(void)
+{
+    int i, j;
+    ExtensionModule *ext, *newList;
+    NODE *node;
+
+    graph = NULL;
+    longest = 0;
+    sorted = NULL;
+    last = NULL;
+    cycle_buf = NULL;
+    longest_cycle = NULL;
+
+    /*
+     * Parse list and build the graph.  Enter them in reverse order
+     * because tsort() will reverse those that have no depedencies.
+     */
+    for (i = numExtensionModules - 1; i >= 0; i--) {
+	ext = &ExtensionModuleList[i];
+	add_arc(ext->name, ext->name);
+#ifdef DEBUG
+	ErrorF("Extension %s:\n", ext->name);
+#endif
+	if (ext->initDependencies)
+	    for (j = 0; ext->initDependencies[j]; j++) {
+		add_arc(ext->initDependencies[j], ext->name);
+#ifdef DEBUG
+		ErrorF("\t%s\n", ext->initDependencies[j]);
+#endif
+	    }
+    }
+    tsort();
+    newList = xnfalloc((numExtensionModules + 1) * sizeof(ExtensionModule));
+    i = 0;
+    for (node = sorted; node; node = node->n_next) {
+	for (j = 0; j < numExtensionModules; j++)
+	    if (!strcmp(node->n_name, ExtensionModuleList[j].name))
+		break;
+	if (j != numExtensionModules)
+	    newList[i++] = ExtensionModuleList[j];
+    }
+    if (sorted)
+	free_nodes(sorted);
+    if (graph)
+	free_nodes(graph);
+    newList[i].name = NULL;
+    free(ExtensionModuleList);
+    ExtensionModuleList = newList;
+#ifdef DEBUG
+    for (i = 0; ExtensionModuleList[i].name; i++)
+	ErrorF("Extension %s\n", ExtensionModuleList[i].name);
+#endif
+}