1 files changed, 41 insertions, 8 deletions

diff --git a/textscreen/txt_sdl.c b/textscreen/txt_sdl.c
index cfeaf0b0..71736720 100644
--- a/textscreen/txt_sdl.c
+++ b/textscreen/txt_sdl.c
@@ -162,7 +162,7 @@ static void ChooseFont(void)
 }
 
 //
-// Initialise text mode screen
+// Initialize text mode screen
 //
 // Returns 1 if successful, 0 if an error occurred
 //
@@ -221,7 +221,7 @@ static inline void UpdateCharacter(int x, int y)
     unsigned char *p;
     unsigned char *s, *s1;
     int bg, fg;
-    int x1, y1;
+    unsigned int x1, y1;
 
     p = &screendata[(y * TXT_SCREEN_W + x) * 2];
     character = p[0];
@@ -267,19 +267,44 @@ static inline void UpdateCharacter(int x, int y)
     }
 }
 
+static int LimitToRange(int val, int min, int max)
+{
+    if (val < min)
+    {
+        return min;
+    }
+    else if (val > max)
+    {
+        return max;
+    }
+    else
+    {
+        return val;
+    }
+}
+
 void TXT_UpdateScreenArea(int x, int y, int w, int h)
 {
     int x1, y1;
+    int x_end;
+    int y_end;
+
+    x_end = LimitToRange(x + w, 0, TXT_SCREEN_W - 1);
+    y_end = LimitToRange(y + h, 0, TXT_SCREEN_H - 1);
+    x = LimitToRange(x, 0, TXT_SCREEN_W - 1);
+    y = LimitToRange(y, 0, TXT_SCREEN_H - 1);
 
-    for (y1=y; y1<y+h; ++y1)
+    for (y1=y; y1<y_end; ++y1)
     {
-        for (x1=x; x1<x+w; ++x1)
+        for (x1=x; x1<x_end; ++x1)
         {
             UpdateCharacter(x1, y1);
         }
     }
 
-    SDL_UpdateRect(screen, x * font->w, y * font->h, w * font->w, h * font->h);
+    SDL_UpdateRect(screen,
+                   x * font->w, y * font->h,
+                   (x_end - x) * font->w, (y_end - y) * font->h);
 }
 
 void TXT_UpdateScreen(void)
@@ -289,7 +314,11 @@ void TXT_UpdateScreen(void)
 
 void TXT_GetMousePosition(int *x, int *y)
 {
+#if SDL_VERSION_ATLEAST(1, 3, 0)
+    SDL_GetMouseState(0, x, y);
+#else
     SDL_GetMouseState(x, y);
+#endif
 
     *x /= font->w;
     *y /= font->h;
@@ -328,7 +357,9 @@ static int TranslateKey(SDL_keysym *sym)
 
         case SDLK_PAUSE:       return KEY_PAUSE;
 
+#if !SDL_VERSION_ATLEAST(1, 3, 0)
         case SDLK_EQUALS:      return KEY_EQUALS;
+#endif
 
         case SDLK_LSHIFT:
         case SDLK_RSHIFT:
@@ -339,9 +370,11 @@ static int TranslateKey(SDL_keysym *sym)
                                return KEY_RCTRL;
 
         case SDLK_LALT:
-        case SDLK_LMETA:
         case SDLK_RALT:
+#if !SDL_VERSION_ATLEAST(1, 3, 0)
+        case SDLK_LMETA:
         case SDLK_RMETA:
+#endif
                                return KEY_RALT;
 
         case SDLK_CAPSLOCK:    return KEY_CAPSLOCK;
@@ -462,7 +495,7 @@ signed int TXT_GetChar(void)
     return -1;
 }
 
-static char *SpecialKeyName(int key)
+static const char *SpecialKeyName(int key)
 {
     switch (key)
     {
@@ -528,7 +561,7 @@ static char *SpecialKeyName(int key)
 
 void TXT_GetKeyDescription(int key, char *buf)
 {
-    char *keyname;
+    const char *keyname;
 
     keyname = SpecialKeyName(key);