X-Git-Url: https://git.artsoft.org/?a=blobdiff_plain;f=src%2Flibgame%2Fmisc.c;h=39a55435f9720611e17fa1b04218f7e4bee349ab;hb=97f03ad86e7458be79933d91363a38c4d2e35deb;hp=81ec00e7a1cc2245f1dd573d100a3c6e38296f48;hpb=a8816d6e5319f9ec26a45346b08250f61e95c011;p=rocksndiamonds.git

diff --git a/src/libgame/misc.c b/src/libgame/misc.c
index 81ec00e7..39a55435 100644
--- a/src/libgame/misc.c
+++ b/src/libgame/misc.c
@@ -65,6 +65,22 @@ static void fPrintLog(FILE *stream, char *format, va_list ap)
 }
 #endif
 
+static void vfprintf_nonewline(FILE *stream, char *format, va_list ap)
+{
+#if defined(PLATFORM_ANDROID)
+  // (prefix text of logging output is currently skipped on Android)
+  //__android_log_vprint(android_log_prio, program.program_title, format, ap);
+#else
+  va_list ap2;
+  va_copy(ap2, ap);
+
+  vfprintf(stream, format, ap);
+  vfprintf(stderr, format, ap2);
+
+  va_end(ap2);
+#endif
+}
+
 static void vfprintf_newline(FILE *stream, char *format, va_list ap)
 {
 #if defined(PLATFORM_ANDROID)
@@ -72,11 +88,28 @@ static void vfprintf_newline(FILE *stream, char *format, va_list ap)
 #else
   char *newline = STRING_NEWLINE;
 
+  va_list ap2;
+  va_copy(ap2, ap);
+
   vfprintf(stream, format, ap);
   fprintf(stream, "%s", newline);
+
+  vfprintf(stderr, format, ap2);
+  fprintf(stderr, "%s", newline);
+
+  va_end(ap2);
 #endif
 }
 
+static void fprintf_nonewline(FILE *stream, char *format, ...)
+{
+  va_list ap;
+
+  va_start(ap, format);
+  vfprintf_nonewline(stream, format, ap);
+  va_end(ap);
+}
+
 static void fprintf_newline(FILE *stream, char *format, ...)
 {
   va_list ap;
@@ -91,7 +124,7 @@ void fprintf_line(FILE *stream, char *line_chars, int line_length)
   int i;
 
   for (i = 0; i < line_length; i++)
-    fprintf(stream, "%s", line_chars);
+    fprintf_nonewline(stream, "%s", line_chars);
 
   fprintf_newline(stream, "");
 }
@@ -190,18 +223,6 @@ boolean getTokenValueFromString(char *string, char **token, char **value)
 /* counter functions                                                         */
 /* ------------------------------------------------------------------------- */
 
-#if defined(PLATFORM_MSDOS)
-volatile unsigned int counter = 0;
-
-void increment_counter()
-{
-  counter++;
-}
-
-END_OF_FUNCTION(increment_counter);
-#endif
-
-
 /* maximal allowed length of a command line option */
 #define MAX_OPTION_LEN		256
 
@@ -212,20 +233,7 @@ static unsigned int getCurrentMS()
 {
   return SDL_GetTicks();
 }
-
-#else /* !TARGET_SDL */
-
-#if defined(PLATFORM_UNIX)
-static unsigned int getCurrentMS()
-{
-  struct timeval current_time;
-
-  gettimeofday(&current_time, NULL);
-
-  return current_time.tv_sec * 1000 + current_time.tv_usec / 1000;
-}
-#endif /* PLATFORM_UNIX */
-#endif /* !TARGET_SDL */
+#endif
 
 static unsigned int mainCounter(int mode)
 {
@@ -262,50 +270,18 @@ static unsigned int mainCounter(int mode)
 
   return counter_ms;		/* return milliseconds since last init */
 }
-
-#else /* !TARGET_SDL */
-
-#if defined(PLATFORM_UNIX)
-static unsigned int mainCounter(int mode)
-{
-  static struct timeval base_time = { 0, 0 };
-  struct timeval current_time;
-  unsigned int counter_ms;
-
-  gettimeofday(&current_time, NULL);
-
-  /* reset base time in case of counter initializing or wrap-around */
-  if (mode == INIT_COUNTER || current_time.tv_sec < base_time.tv_sec)
-    base_time = current_time;
-
-  counter_ms = (current_time.tv_sec  - base_time.tv_sec)  * 1000
-             + (current_time.tv_usec - base_time.tv_usec) / 1000;
-
-  return counter_ms;		/* return milliseconds since last init */
-}
-#endif /* PLATFORM_UNIX */
-#endif /* !TARGET_SDL */
+#endif
 
 #endif
 
 void InitCounter()		/* set counter back to zero */
 {
-#if !defined(PLATFORM_MSDOS)
   mainCounter(INIT_COUNTER);
-#else
-  LOCK_VARIABLE(counter);
-  LOCK_FUNCTION(increment_counter);
-  install_int_ex(increment_counter, BPS_TO_TIMER(100));
-#endif
 }
 
 unsigned int Counter()	/* get milliseconds since last call of InitCounter() */
 {
-#if !defined(PLATFORM_MSDOS)
   return mainCounter(READ_COUNTER);
-#else
-  return (counter * 10);
-#endif
 }
 
 static void sleep_milliseconds(unsigned int milliseconds_delay)
@@ -329,8 +305,6 @@ static void sleep_milliseconds(unsigned int milliseconds_delay)
   {
 #if defined(TARGET_SDL)
     SDL_Delay(milliseconds_delay);
-#elif defined(TARGET_ALLEGRO)
-    rest(milliseconds_delay);
 #else
     struct timeval delay;
 
@@ -441,7 +415,7 @@ unsigned int get_random_number(int nr, int max)
 /* system info functions                                                     */
 /* ------------------------------------------------------------------------- */
 
-#if !defined(PLATFORM_MSDOS)
+#if !defined(PLATFORM_ANDROID)
 static char *get_corrected_real_name(char *real_name)
 {
   char *real_name_new = checked_malloc(MAX_USERNAME_LEN + 1);
@@ -675,7 +649,7 @@ char *getPath3(char *path1, char *path2, char *path3)
   return getStringCat3WithSeparator(path1, path2, path3, STRING_PATH_SEPARATOR);
 }
 
-char *getStringCopy(char *s)
+char *getStringCopy(const char *s)
 {
   char *s_copy;
 
@@ -688,7 +662,7 @@ char *getStringCopy(char *s)
   return s_copy;
 }
 
-char *getStringCopyN(char *s, int n)
+char *getStringCopyN(const char *s, int n)
 {
   char *s_copy;
   int s_len = MAX(0, n);
@@ -703,7 +677,18 @@ char *getStringCopyN(char *s, int n)
   return s_copy;
 }
 
-char *getStringToLower(char *s)
+char *getStringCopyNStatic(const char *s, int n)
+{
+  static char *s_copy = NULL;
+
+  checked_free(s_copy);
+
+  s_copy = getStringCopyN(s, n);
+
+  return s_copy;
+}
+
+char *getStringToLower(const char *s)
 {
   char *s_copy = checked_malloc(strlen(s) + 1);
   char *s_ptr = s_copy;
@@ -1024,15 +1009,17 @@ void GetOptions(char *argv[], void (*print_usage_function)(void))
 /* error handling functions                                                  */
 /* ------------------------------------------------------------------------- */
 
+#define MAX_INTERNAL_ERROR_SIZE		1024
+
 /* used by SetError() and GetError() to store internal error messages */
-static char internal_error[1024];	/* this is bad */
+static char internal_error[MAX_INTERNAL_ERROR_SIZE];
 
 void SetError(char *format, ...)
 {
   va_list ap;
 
   va_start(ap, format);
-  vsprintf(internal_error, format, ap);
+  vsnprintf(internal_error, MAX_INTERNAL_ERROR_SIZE, format, ap);
   va_end(ap);
 }
 
@@ -1083,11 +1070,11 @@ void Error(int mode, char *format, ...)
   {
     va_list ap;
 
-    fprintf(program.error_file, "%s%s: ", program.command_basename,
-	    process_name);
+    fprintf_nonewline(program.error_file, "%s%s: ", program.command_basename,
+		      process_name);
 
     if (mode & ERR_WARN)
-      fprintf(program.error_file, "warning: ");
+      fprintf_nonewline(program.error_file, "warning: ");
 
     va_start(ap, format);
     vfprintf_newline(program.error_file, format, ap);
@@ -1208,11 +1195,22 @@ inline void swap_number_pairs(int *x1, int *y1, int *x2, int *y2)
    of the (not yet written) chunk, write the correct chunk size and finally
    write the chunk itself */
 
+#if 1
+
+int getFile8BitInteger(File *file)
+{
+  return getByteFromFile(file);
+}
+
+#else
+
 int getFile8BitInteger(FILE *file)
 {
   return fgetc(file);
 }
 
+#endif
+
 int putFile8BitInteger(FILE *file, int value)
 {
   if (file != NULL)
@@ -1221,6 +1219,20 @@ int putFile8BitInteger(FILE *file, int value)
   return 1;
 }
 
+#if 1
+
+int getFile16BitInteger(File *file, int byte_order)
+{
+  if (byte_order == BYTE_ORDER_BIG_ENDIAN)
+    return ((getByteFromFile(file) << 8) |
+	    (getByteFromFile(file) << 0));
+  else		 /* BYTE_ORDER_LITTLE_ENDIAN */
+    return ((getByteFromFile(file) << 0) |
+	    (getByteFromFile(file) << 8));
+}
+
+#else
+
 int getFile16BitInteger(FILE *file, int byte_order)
 {
   if (byte_order == BYTE_ORDER_BIG_ENDIAN)
@@ -1231,6 +1243,8 @@ int getFile16BitInteger(FILE *file, int byte_order)
 	    (fgetc(file) << 8));
 }
 
+#endif
+
 int putFile16BitInteger(FILE *file, int value, int byte_order)
 {
   if (file != NULL)
@@ -1250,6 +1264,24 @@ int putFile16BitInteger(FILE *file, int value, int byte_order)
   return 2;
 }
 
+#if 1
+
+int getFile32BitInteger(File *file, int byte_order)
+{
+  if (byte_order == BYTE_ORDER_BIG_ENDIAN)
+    return ((getByteFromFile(file) << 24) |
+	    (getByteFromFile(file) << 16) |
+	    (getByteFromFile(file) <<  8) |
+	    (getByteFromFile(file) <<  0));
+  else		 /* BYTE_ORDER_LITTLE_ENDIAN */
+    return ((getByteFromFile(file) <<  0) |
+	    (getByteFromFile(file) <<  8) |
+	    (getByteFromFile(file) << 16) |
+	    (getByteFromFile(file) << 24));
+}
+
+#else
+
 int getFile32BitInteger(FILE *file, int byte_order)
 {
   if (byte_order == BYTE_ORDER_BIG_ENDIAN)
@@ -1264,6 +1296,8 @@ int getFile32BitInteger(FILE *file, int byte_order)
 	    (fgetc(file) << 24));
 }
 
+#endif
+
 int putFile32BitInteger(FILE *file, int value, int byte_order)
 {
   if (file != NULL)
@@ -1287,6 +1321,28 @@ int putFile32BitInteger(FILE *file, int value, int byte_order)
   return 4;
 }
 
+#if 1
+
+boolean getFileChunk(File *file, char *chunk_name, int *chunk_size,
+		     int byte_order)
+{
+  const int chunk_name_length = 4;
+
+  /* read chunk name */
+  if (getStringFromFile(file, chunk_name, chunk_name_length + 1) == NULL)
+    return FALSE;
+
+  if (chunk_size != NULL)
+  {
+    /* read chunk size */
+    *chunk_size = getFile32BitInteger(file, byte_order);
+  }
+
+  return (checkEndOfFile(file) ? FALSE : TRUE);
+}
+
+#else
+
 boolean getFileChunk(FILE *file, char *chunk_name, int *chunk_size,
 		     int byte_order)
 {
@@ -1305,6 +1361,8 @@ boolean getFileChunk(FILE *file, char *chunk_name, int *chunk_size,
   return (feof(file) || ferror(file) ? FALSE : TRUE);
 }
 
+#endif
+
 int putFileChunk(FILE *file, char *chunk_name, int chunk_size,
 		 int byte_order)
 {
@@ -1328,6 +1386,21 @@ int putFileChunk(FILE *file, char *chunk_name, int chunk_size,
   return num_bytes;
 }
 
+#if 1
+
+int getFileVersion(File *file)
+{
+  int version_major = getByteFromFile(file);
+  int version_minor = getByteFromFile(file);
+  int version_patch = getByteFromFile(file);
+  int version_build = getByteFromFile(file);
+
+  return VERSION_IDENT(version_major, version_minor, version_patch,
+		       version_build);
+}
+
+#else
+
 int getFileVersion(FILE *file)
 {
   int version_major = fgetc(file);
@@ -1339,6 +1412,8 @@ int getFileVersion(FILE *file)
 		       version_build);
 }
 
+#endif
+
 int putFileVersion(FILE *file, int version)
 {
   if (file != NULL)
@@ -1357,6 +1432,18 @@ int putFileVersion(FILE *file, int version)
   return 4;
 }
 
+#if 1
+
+void ReadBytesFromFile(File *file, byte *buffer, unsigned int bytes)
+{
+  int i;
+
+  for (i = 0; i < bytes && !checkEndOfFile(file); i++)
+    buffer[i] = getByteFromFile(file);
+}
+
+#else
+
 void ReadBytesFromFile(FILE *file, byte *buffer, unsigned int bytes)
 {
   int i;
@@ -1365,6 +1452,8 @@ void ReadBytesFromFile(FILE *file, byte *buffer, unsigned int bytes)
     buffer[i] = fgetc(file);
 }
 
+#endif
+
 void WriteBytesToFile(FILE *file, byte *buffer, unsigned int bytes)
 {
   int i;
@@ -1373,12 +1462,24 @@ void WriteBytesToFile(FILE *file, byte *buffer, unsigned int bytes)
     fputc(buffer[i], file);
 }
 
+#if 1
+
+void ReadUnusedBytesFromFile(File *file, unsigned int bytes)
+{
+  while (bytes-- && !checkEndOfFile(file))
+    getByteFromFile(file);
+}
+
+#else
+
 void ReadUnusedBytesFromFile(FILE *file, unsigned int bytes)
 {
   while (bytes-- && !feof(file))
     fgetc(file);
 }
 
+#endif
+
 void WriteUnusedBytesToFile(FILE *file, unsigned int bytes)
 {
   while (bytes--)
@@ -1453,7 +1554,11 @@ void translate_keyname(Key *keysym, char **x11name, char **name, int mode)
     { KSYM_End,		"XK_End",		"end" },
     { KSYM_Page_Up,	"XK_Page_Up",		"page up" },
     { KSYM_Page_Down,	"XK_Page_Down",		"page down" },
-    { KSYM_Menu,	"XK_Menu",		"menu" },	 /* Win-Menu */
+
+#if defined(TARGET_SDL2)
+    { KSYM_Menu,	"XK_Menu",		"menu" },	 /* menu key */
+    { KSYM_Back,	"XK_Back",		"back" },	 /* back key */
+#endif
 
     /* ASCII 0x20 to 0x40 keys (except numbers) */
     { KSYM_space,	"XK_space",		"space" },
@@ -1493,8 +1598,7 @@ void translate_keyname(Key *keysym, char **x11name, char **name, int mode)
     { KSYM_braceright,	"XK_braceright",	"brace right" },
     { KSYM_asciitilde,	"XK_asciitilde",	"~" },
 
-#if !defined(TARGET_SDL2)
-    /* special (non-ASCII) keys */
+    /* special (non-ASCII) keys (ISO-Latin-1) */
     { KSYM_degree,	"XK_degree",		"°" },
     { KSYM_Adiaeresis,	"XK_Adiaeresis",	"Ä" },
     { KSYM_Odiaeresis,	"XK_Odiaeresis",	"Ö" },
@@ -1503,6 +1607,34 @@ void translate_keyname(Key *keysym, char **x11name, char **name, int mode)
     { KSYM_odiaeresis,	"XK_odiaeresis",	"ö" },
     { KSYM_udiaeresis,	"XK_udiaeresis",	"ü" },
     { KSYM_ssharp,	"XK_ssharp",		"sharp s" },
+
+#if defined(TARGET_SDL2)
+    /* special (non-ASCII) keys (UTF-8, for reverse mapping only) */
+    { KSYM_degree,	"XK_degree",		"\xc2\xb0" },
+    { KSYM_Adiaeresis,	"XK_Adiaeresis",	"\xc3\x84" },
+    { KSYM_Odiaeresis,	"XK_Odiaeresis",	"\xc3\x96" },
+    { KSYM_Udiaeresis,	"XK_Udiaeresis",	"\xc3\x9c" },
+    { KSYM_adiaeresis,	"XK_adiaeresis",	"\xc3\xa4" },
+    { KSYM_odiaeresis,	"XK_odiaeresis",	"\xc3\xb6" },
+    { KSYM_udiaeresis,	"XK_udiaeresis",	"\xc3\xbc" },
+    { KSYM_ssharp,	"XK_ssharp",		"\xc3\x9f" },
+
+    /* other keys (for reverse mapping only) */
+    { KSYM_space,	"XK_space",		" " },
+#endif
+
+#if defined(TARGET_SDL2)
+    /* keypad keys are not in numerical order in SDL2 */
+    { KSYM_KP_0,	"XK_KP_0",		"keypad 0" },
+    { KSYM_KP_1,	"XK_KP_1",		"keypad 1" },
+    { KSYM_KP_2,	"XK_KP_2",		"keypad 2" },
+    { KSYM_KP_3,	"XK_KP_3",		"keypad 3" },
+    { KSYM_KP_4,	"XK_KP_4",		"keypad 4" },
+    { KSYM_KP_5,	"XK_KP_5",		"keypad 5" },
+    { KSYM_KP_6,	"XK_KP_6",		"keypad 6" },
+    { KSYM_KP_7,	"XK_KP_7",		"keypad 7" },
+    { KSYM_KP_8,	"XK_KP_8",		"keypad 8" },
+    { KSYM_KP_9,	"XK_KP_9",		"keypad 9" },
 #endif
 
     /* end-of-array identifier */
@@ -1522,8 +1654,10 @@ void translate_keyname(Key *keysym, char **x11name, char **name, int mode)
       sprintf(name_buffer, "%c", 'a' + (char)(key - KSYM_a));
     else if (key >= KSYM_0 && key <= KSYM_9)
       sprintf(name_buffer, "%c", '0' + (char)(key - KSYM_0));
+#if !defined(TARGET_SDL2)
     else if (key >= KSYM_KP_0 && key <= KSYM_KP_9)
       sprintf(name_buffer, "keypad %c", '0' + (char)(key - KSYM_KP_0));
+#endif
     else if (key >= KSYM_FKEY_FIRST && key <= KSYM_FKEY_LAST)
       sprintf(name_buffer, "F%d", (int)(key - KSYM_FKEY_FIRST + 1));
     else if (key == KSYM_UNDEFINED)
@@ -1559,8 +1693,10 @@ void translate_keyname(Key *keysym, char **x11name, char **name, int mode)
       sprintf(name_buffer, "XK_%c", 'a' + (char)(key - KSYM_a));
     else if (key >= KSYM_0 && key <= KSYM_9)
       sprintf(name_buffer, "XK_%c", '0' + (char)(key - KSYM_0));
+#if !defined(TARGET_SDL2)
     else if (key >= KSYM_KP_0 && key <= KSYM_KP_9)
       sprintf(name_buffer, "XK_KP_%c", '0' + (char)(key - KSYM_KP_0));
+#endif
     else if (key >= KSYM_FKEY_FIRST && key <= KSYM_FKEY_LAST)
       sprintf(name_buffer, "XK_F%d", (int)(key - KSYM_FKEY_FIRST + 1));
     else if (key == KSYM_UNDEFINED)
@@ -1588,17 +1724,34 @@ void translate_keyname(Key *keysym, char **x11name, char **name, int mode)
   else if (mode == TRANSLATE_KEYNAME_TO_KEYSYM)
   {
     Key key = KSYM_UNDEFINED;
+    char *name_ptr = *name;
 
-    i = 0;
-    do
+    if (strlen(*name) == 1)
     {
-      if (strEqual(translate_key[i].name, *name))
+      char c = name_ptr[0];
+
+      if (c >= 'A' && c <= 'Z')
+	key = KSYM_A + (Key)(c - 'A');
+      else if (c >= 'a' && c <= 'z')
+	key = KSYM_a + (Key)(c - 'a');
+      else if (c >= '0' && c <= '9')
+	key = KSYM_0 + (Key)(c - '0');
+    }
+
+    if (key == KSYM_UNDEFINED)
+    {
+      i = 0;
+
+      do
       {
-	key = translate_key[i].key;
-	break;
+	if (strEqual(translate_key[i].name, *name))
+	{
+	  key = translate_key[i].key;
+	  break;
+	}
       }
+      while (translate_key[++i].x11name);
     }
-    while (translate_key[++i].x11name);
 
     if (key == KSYM_UNDEFINED)
       Error(ERR_WARN, "getKeyFromKeyName(): not completely implemented");
@@ -1621,6 +1774,7 @@ void translate_keyname(Key *keysym, char **x11name, char **name, int mode)
       else if (c >= '0' && c <= '9')
 	key = KSYM_0 + (Key)(c - '0');
     }
+#if !defined(TARGET_SDL2)
     else if (strPrefix(name_ptr, "XK_KP_") && strlen(name_ptr) == 7)
     {
       char c = name_ptr[6];
@@ -1628,6 +1782,7 @@ void translate_keyname(Key *keysym, char **x11name, char **name, int mode)
       if (c >= '0' && c <= '9')
 	key = KSYM_KP_0 + (Key)(c - '0');
     }
+#endif
     else if (strPrefix(name_ptr, "XK_F") && strlen(name_ptr) <= 6)
     {
       char c1 = name_ptr[4];
@@ -1939,7 +2094,7 @@ int closeFile(File *file)
   if (file == NULL)
     return -1;
 
-  int result;
+  int result = 0;
 
 #if defined(PLATFORM_ANDROID)
   if (file->asset_file)
@@ -1965,6 +2120,64 @@ int checkEndOfFile(File *file)
   return feof(file->file);
 }
 
+size_t readFile(File *file, void *buffer, size_t item_size, size_t num_items)
+{
+#if defined(PLATFORM_ANDROID)
+  if (file->file_is_asset)
+  {
+    if (file->end_of_file)
+      return 0;
+
+    size_t num_items_read =
+      SDL_RWread(file->asset_file, buffer, item_size, num_items);
+
+    if (num_items_read < num_items)
+      file->end_of_file = TRUE;
+
+    return num_items_read;
+  }
+#endif
+
+  return fread(buffer, item_size, num_items, file->file);
+}
+
+int seekFile(File *file, long offset, int whence)
+{
+#if defined(PLATFORM_ANDROID)
+  if (file->file_is_asset)
+  {
+    int sdl_whence = (whence == SEEK_SET ? RW_SEEK_SET :
+		      whence == SEEK_CUR ? RW_SEEK_CUR :
+		      whence == SEEK_END ? RW_SEEK_END : 0);
+
+    return (SDL_RWseek(file->asset_file, offset, sdl_whence) == -1 ? -1 : 0);
+  }
+#endif
+
+  return fseek(file->file, offset, whence);
+}
+
+int getByteFromFile(File *file)
+{
+#if defined(PLATFORM_ANDROID)
+  if (file->file_is_asset)
+  {
+    if (file->end_of_file)
+      return EOF;
+
+    byte c;
+    size_t num_bytes_read = SDL_RWread(file->asset_file, &c, 1, 1);
+
+    if (num_bytes_read < 1)
+      file->end_of_file = TRUE;
+
+    return (file->end_of_file ? EOF : (int)c);
+  }
+#endif
+
+  return fgetc(file->file);
+}
+
 char *getStringFromFile(File *file, char *line, int size)
 {
 #if defined(PLATFORM_ANDROID)
@@ -2041,7 +2254,7 @@ int closeDirectory(Directory *dir)
   if (dir == NULL)
     return -1;
 
-  int result;
+  int result = 0;
 
 #if defined(PLATFORM_ANDROID)
   if (dir->asset_toc_file)
@@ -2090,7 +2303,7 @@ DirectoryEntry *readDirectory(Directory *dir)
     dir->dir_entry = checked_calloc(sizeof(DirectoryEntry));
 
     dir->dir_entry->is_directory = FALSE;
-    if (line[strlen(line) - 1] = '/')
+    if (line[strlen(line) - 1] == '/')
     {
       dir->dir_entry->is_directory = TRUE;
 
@@ -2144,23 +2357,53 @@ void freeDirectoryEntry(DirectoryEntry *dir_entry)
 /* functions for checking files and filenames                                */
 /* ------------------------------------------------------------------------- */
 
+boolean directoryExists(char *dir_name)
+{
+  if (dir_name == NULL)
+    return FALSE;
+
+  boolean success = (access(dir_name, F_OK) == 0);
+
+#if defined(PLATFORM_ANDROID)
+  if (!success)
+  {
+    // this might be an asset directory; check by trying to open toc file
+    char *asset_toc_filename = getPath2(dir_name, ASSET_TOC_BASENAME);
+    SDL_RWops *file = SDL_RWFromFile(asset_toc_filename, MODE_READ);
+
+    checked_free(asset_toc_filename);
+
+    success = (file != NULL);
+
+    if (success)
+      SDL_RWclose(file);
+  }
+#endif
+
+  return success;
+}
+
 boolean fileExists(char *filename)
 {
   if (filename == NULL)
     return FALSE;
 
+  boolean success = (access(filename, F_OK) == 0);
+
 #if defined(PLATFORM_ANDROID)
-  // workaround: check if file exists by opening and closing it
-  SDL_RWops *file = SDL_RWFromFile(filename, MODE_READ);
-  boolean success = (file != NULL);
+  if (!success)
+  {
+    // this might be an asset file; check by trying to open it
+    SDL_RWops *file = SDL_RWFromFile(filename, MODE_READ);
 
-  if (success)
-    SDL_RWclose(file);
+    success = (file != NULL);
 
-  return success;
-#else
-  return (access(filename, F_OK) == 0);
+    if (success)
+      SDL_RWclose(file);
+  }
 #endif
+
+  return success;
 }
 
 boolean fileHasPrefix(char *basename, char *prefix)
@@ -2207,38 +2450,49 @@ boolean fileHasSuffix(char *basename, char *suffix)
   return FALSE;
 }
 
+#if defined(TARGET_SDL)
+static boolean FileCouldBeArtwork(char *basename)
+{
+  return (!strEqual(basename, ".") &&
+	  !strEqual(basename, "..") &&
+	  !fileHasSuffix(basename, "txt") &&
+	  !fileHasSuffix(basename, "conf"));
+}
+#endif
+
 boolean FileIsGraphic(char *filename)
 {
-#if 1
-  return TRUE;
-#else
   char *basename = getBaseNamePtr(filename);
 
+#if defined(TARGET_SDL)
+  return FileCouldBeArtwork(basename);
+#else
   return fileHasSuffix(basename, "pcx");
 #endif
 }
 
 boolean FileIsSound(char *filename)
 {
-#if 1
-  return TRUE;
-#else
   char *basename = getBaseNamePtr(filename);
 
+#if defined(TARGET_SDL)
+  return FileCouldBeArtwork(basename);
+#else
   return fileHasSuffix(basename, "wav");
 #endif
 }
 
 boolean FileIsMusic(char *filename)
 {
-#if 1
-  return TRUE;
-#else
   char *basename = getBaseNamePtr(filename);
 
+#if defined(TARGET_SDL)
+  return FileCouldBeArtwork(basename);
+#else
   if (FileIsSound(basename))
     return TRUE;
 
+#if 0
 #if defined(TARGET_SDL)
   if ((fileHasPrefix(basename, "mod") && !fileHasSuffix(basename, "txt")) ||
       fileHasSuffix(basename, "mod") ||
@@ -2250,6 +2504,7 @@ boolean FileIsMusic(char *filename)
       fileHasSuffix(basename, "mp3") ||
       fileHasSuffix(basename, "ogg"))
     return TRUE;
+#endif
 #endif
 
   return FALSE;
@@ -3436,6 +3691,9 @@ void openErrorFile()
     Error(ERR_WARN, "cannot open file '%s' for writing: %s",
 	  program.error_filename, strerror(errno));
   }
+
+  /* error output should be unbuffered so it is not truncated in a crash */
+  setbuf(program.error_file, NULL);
 }
 
 void closeErrorFile()
@@ -3476,7 +3734,7 @@ void NotifyUserAboutErrorFile()
 
 #if DEBUG
 
-#define DEBUG_PRINT_INIT_TIMESTAMPS		TRUE
+#define DEBUG_PRINT_INIT_TIMESTAMPS		FALSE
 #define DEBUG_PRINT_INIT_TIMESTAMPS_DEPTH	10
 
 #define DEBUG_NUM_TIMESTAMPS			10
@@ -3573,6 +3831,8 @@ void debug_print_parent_only(char *format, ...)
   }
 }
 
+#endif	/* DEBUG */
+
 void print_timestamp_ext(char *message, char *mode)
 {
 #if DEBUG_PRINT_INIT_TIMESTAMPS
@@ -3636,5 +3896,3 @@ void print_timestamp_done(char *message)
 {
   print_timestamp_ext(message, "DONE");
 }
-
-#endif	/* DEBUG */