From 4c79651326eeabc2a53534a3b8b1b5aff885dd5a Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pjm@nac.net>
Date: Wed, 20 Feb 2013 08:06:16 -0500
Subject: Prevent segmentation faults in some places.

---
(limited to 'src')

diff --git a/src/area.c b/src/area.c
index 7e7f3ed..4f0bc11 100644
--- a/src/area.c
+++ b/src/area.c
@@ -12,6 +12,10 @@ area_new(struct map *map)
 {
 	struct area *a;
 
+	if (map == NULL) {
+		return NULL;
+	}
+
 	a = malloc(sizeof(*a));
 	if (a == NULL) {
 		return NULL;
@@ -126,6 +130,10 @@ render_area_to_viewport(struct area *area, struct viewport *vp)
 	SDL_Rect srcrect;
 	SDL_Rect dstrect;
 
+	if (area == NULL || vp == NULL) {
+		return;
+	}
+
 	srcrect.x = vp->x;
 	srcrect.y = vp->y;
 	srcrect.w = vp->w;
@@ -146,6 +154,13 @@ render_area_to_surface(struct area *area, SDL_Rect *arearect,
 	/* For demo */
 	SDL_Rect tmprect;
 
+	if (area == NULL || arearect == NULL) {
+		return;
+	}
+	if (surface == NULL || surfacerect == NULL) {
+		return;
+	}
+
 	memcpy(&srcrect, arearect, sizeof(srcrect));
 	memcpy(&dstrect, surfacerect, sizeof(dstrect));
 
diff --git a/src/xml.c b/src/xml.c
index e677fe1..d34b0ac 100644
--- a/src/xml.c
+++ b/src/xml.c
@@ -126,9 +126,15 @@ xml_node_pop(XML_Parser p)
 	free(n);
 
 	n = (struct xml_node *) XML_GetUserData(p);
-	XML_SetStartElementHandler(p, n->start);
-	XML_SetEndElementHandler(p, n->end);
-	XML_SetCharacterDataHandler(p, n->charhndl);
+	if (n == NULL) {
+		XML_SetStartElementHandler(p, NULL);
+		XML_SetEndElementHandler(p, NULL);
+		XML_SetCharacterDataHandler(p, NULL);
+	} else {
+		XML_SetStartElementHandler(p, n->start);
+		XML_SetEndElementHandler(p, n->end);
+		XML_SetCharacterDataHandler(p, n->charhndl);
+	}
 
 	return data;
 }
--
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