[Add] Saves are now backed up.

src/land.c

@@ -180,14 +180,14 @@ static void commodity_exchange_open(void) {
  */
 static void commodity_update(unsigned int wid, char* str) {
   (void)str;
-  char buf[128];
+  char buf[PATH_MAX];
   char* comname;
   Commodity* com;
 
   comname = toolkit_getList(wid, "lstGoods");
   com = commodity_get(comname);
 
-  snprintf(buf, 128,
+  snprintf(buf, PATH_MAX,
       "%d tons\n"
       "%d Scred\n"
       "\n"
@@ -1473,7 +1473,10 @@ void takeoff(void) {
   hyperspace_target = h;
 
   /* Cleanup. */
-  save_all(); /* Must be before cleaning up planet. Duh! */
+  if(save_all() < 0) { /* Must be before cleaning up planet. Duh! */
+    dialogue_alert("Failed to save game! You should exit and check the log to \
+                    see what happened and then file a bug report!");
+  }
   land_cleanup(); /* Cleanup stuff. */
   hooks_run("takeoff"); /* Must be run after cleanup sine we don't want the
                            missions to think we are landed. */

src/opengl.c

@@ -643,7 +643,12 @@ void gl_freeTexture(glTexture* texture) {
  *    @return 1 if the pixel is transparent or 0 if it isn't.
  */
 int gl_isTrans(const glTexture* t, const int x, const int y) {
-  return !(t->trans[(y*(int)(t->w)+x)/8] & (1<<((y*(int)(t->w)+x)%8)));
+  int i;
+
+  /* Get the position in the sheet. */
+  i = y*(int)(t->w) + x;
+  /* Now we have to pull out the individual bit. */
+  return !(t->trans[i/8] & (1 << (i%8)));
 }
 
 /**

src/save.c

@@ -5,6 +5,8 @@
  */
 
 #include <stdio.h> /* remove() */
+#include <errno.h>
+
 #include "lephisto.h"
 #include "log.h"
 #include "lxml.h"
@@ -55,7 +57,11 @@ static void load_menu_load(unsigned int wdw, char* str);
 static void load_menu_delete(unsigned wdw, char* str);
 static int  load_game(char* file);
 
-/* Save all the game data. */
+/**
+ * @brief Save all the players game data.
+ *    @param writer XML writer to use.
+ *    @return 0 on success.
+ */
 static int save_data(xmlTextWriterPtr writer) {
   /* The data itself. */
   if(diff_save(writer) < 0)             return -1; /* Must save first or can get cleared. */
@@ -68,9 +74,12 @@ static int save_data(xmlTextWriterPtr writer) {
   return 0;
 }
 
-/* Save the current game. */
+/**
+ * @brief Save the current game.
+ *    @return 0 on success.
+ */
 int save_all(void) {
-  char file[PATH_MAX];
+  char file[PATH_MAX], old[PATH_MAX];
   xmlDocPtr doc;
   xmlTextWriterPtr writer;
 
@@ -98,9 +107,7 @@ int save_all(void) {
   /* Save the data. */
   if(save_data(writer) < 0) {
     ERR("Trying to save game data");
-    xmlFreeTextWriter(writer);
-    xmlFreeDoc(doc);
-    return -1;
+    goto err_writer;
   }
 
   /* Finish the element. */
@@ -110,23 +117,42 @@ int save_all(void) {
   /* Write to file. */
   if(lfile_dirMakeExist("%ssaves", lfile_basePath()) < 0) {
     WARN("Aborting save...");
-    xmlFreeTextWriter(writer);
-    xmlFreeDoc(doc);
-    return -1;
+    goto err_writer;
   }
   snprintf(file, PATH_MAX, "%ssaves/%s.ls", lfile_basePath(), player_name);
 
+  /* Back up old savegame. */
+  snprintf(old, PATH_MAX, "%s.backup", file);
+  if(lfile_fileExists(file)) {
+    if(rename(file, old) < 0) {
+      WARN("Unable to back up old save: %s. Not saving!", strerror(errno));
+      goto err_writer;
+    }
+  }
+
   /* Critical section, if crashes, the players save game gets screwed!!!
-   * HAHAHAHAHA!!!!! -- NOT!
+   * Luckily we have a copy just in case..
    */
   xmlFreeTextWriter(writer);
-  xmlSaveFileEnc(file, doc, "UTF-8");
+  if(xmlSaveFileEnc(file, doc, "UTF-8") < 0) {
+    WARN("Failed to write savegame! You'll most likey have to restore it by \
+          copying your backup savegame over your current savegame.");
+    goto err;
+  }
   xmlFreeDoc(doc);
 
   return 0;
+
+err_writer:
+  xmlFreeTextWriter(writer);
+err:
+  xmlFreeDoc(doc);
+  return -1;
 }
 
-/* Open the load game menu. */
+/**
+ * @brief Open the load game menu.
+ */
 void load_game_menu(void) {
   unsigned int wid;
   char** files;