winex11.drv: Avoid relying on PATH_MAX in X11DRV_FONT_InitX11Metrics helper.

dlls/winex11.drv/xfont.c

@@ -1824,21 +1824,20 @@ static void XFONT_LoadIgnores( HKEY hkey )
  * Returns expanded name for the cachedmetrics file.
  * Now it also appends the current value of the $DISPLAY variable.
  */
-static char* XFONT_UserMetricsCache( char* buffer, int* buf_size )
+static char* XFONT_UserMetricsCache(void)
 {
     const char *confdir = wine_get_config_dir();
     const char *display_name = XDisplayName(NULL);
     int len = strlen(confdir) + strlen(INIFontMetrics) + strlen(display_name) + 8;
+    char *buffer;
     unsigned int display = 0;
     unsigned int screen = 0;
     char *p, *ext;
 
-
-    if ((len > *buf_size) &&
-        !(buffer = HeapReAlloc( GetProcessHeap(), 0, buffer, *buf_size = len )))
+    if (!(buffer = HeapAlloc(GetProcessHeap(), 0, len)))
     {
         ERR("out of memory\n");
-        ExitProcess(1);
+        return NULL;
     }
     sprintf( buffer, "%s/%s", confdir, INIFontMetrics );
 
@@ -2890,9 +2889,9 @@ static void X11DRV_FONT_InitX11Metrics( void )
 {
   char**    x_pattern;
   unsigned  x_checksum;
-  int       i, x_count, buf_size;
-  char      *buffer;
-  HKEY hkey;
+  int       i, x_count;
+  char      *buffer = NULL;
+  HKEY hkey = NULL;
   XFontStruct*  x_fs;
   char fontcheck_name[] = "-*-*-*-*-normal-*-[12 0 0 12]-*-72-*-*-*-iso8859-1";
 
@@ -2907,48 +2906,48 @@ static void X11DRV_FONT_InitX11Metrics( void )
   for( i = x_checksum = 0; i < x_count; i++ )
   {
      int j;
-#if 0
-     printf("%i\t: %s\n", i, x_pattern[i] );
-#endif
 
      j = strlen( x_pattern[i] );
      if( j ) x_checksum ^= __genericCheckSum( x_pattern[i], j );
   }
   x_checksum |= X_PFONT_MAGIC;
-  buf_size = PATH_MAX;
-  buffer = HeapAlloc( GetProcessHeap(), 0, buf_size );
 
   /* deal with systemwide font metrics cache */
 
-  buffer[0] = 0;
   /* @@ Wine registry key: HKCU\Software\Wine\X11 Driver\Fonts */
-  if (RegOpenKeyA(HKEY_CURRENT_USER, INIFontSection, &hkey)) hkey = 0;
-  if (hkey)
+  if (RegOpenKeyA(HKEY_CURRENT_USER, INIFontSection, &hkey) == ERROR_SUCCESS)
   {
-	DWORD type, count = buf_size;
-	RegQueryValueExA(hkey, INIGlobalMetrics, 0, &type, (LPBYTE)buffer, &count);
-  }
-
-  if( buffer[0] )
+    DWORD type, count = 0;
+    if (RegQueryValueExA(hkey, INIGlobalMetrics, NULL, &type, NULL, &count) == ERROR_SUCCESS &&
+        type == REG_SZ)
     {
+      buffer = HeapAlloc(GetProcessHeap(), 0, count + 1);
+      if (RegQueryValueExA(hkey, INIGlobalMetrics, NULL, NULL, (LPBYTE)buffer, &count) == ERROR_SUCCESS)
+      {
+        buffer[count] = '\0';
         TRACE("system fontcache is '%s'\n", buffer);
         XFONT_ReadCachedMetrics(buffer, DefResolution, x_checksum, x_count);
       }
+      HeapFree(GetProcessHeap(), 0, buffer);
+      buffer = NULL;
+    }
+  }
+
   if (fontList == NULL)
   {
     /* try per-user */
-      buffer = XFONT_UserMetricsCache( buffer, &buf_size );
-      if( buffer[0] )
+    buffer = XFONT_UserMetricsCache();
+    if (buffer)
     {
       TRACE("user fontcache is '%s'\n", buffer);
       XFONT_ReadCachedMetrics(buffer, DefResolution, x_checksum, x_count);
     }
   }
 
-  if( fontList == NULL )	/* build metrics from scratch */
+  if (fontList == NULL) /* build metrics from scratch */
   {
       int n_ff = XFONT_BuildMetrics(x_pattern, DefResolution, x_checksum, x_count);
-      if( buffer[0] )	 /* update cached metrics */
+      if( buffer )	 /* update cached metrics */
       {
 	  int fd = open( buffer, O_CREAT | O_TRUNC | O_RDWR, 0666 );
 	  if ( fd < 0 )
@@ -2963,6 +2962,8 @@ static void X11DRV_FONT_InitX11Metrics( void )
       }
   }
 
+  HeapFree(GetProcessHeap(), 0, buffer);
+
   wine_tsx11_lock();
   XFreeFontNames(x_pattern);
 
@@ -2975,8 +2976,6 @@ static void X11DRV_FONT_InitX11Metrics( void )
 
   wine_tsx11_unlock();
 
-  HeapFree(GetProcessHeap(), 0, buffer);
-
   XFONT_WindowsNames();
   XFONT_LoadAliases( hkey );
   if (hkey) XFONT_LoadDefaults( hkey );