libvdpau (0.4.1-3) simplify-dlopen-path-length-error-handling.patch

From: Andreas Beckmann <debian@abeckmann.de>
Subject: simplify path overflow error handling
 "path too long" is not a fatal error, there may be other search paths
 that don't overflow, so try them as well

Index: b/src/vdpau_wrapper.c
===================================================================
--- a/src/vdpau_wrapper.c
+++ b/src/vdpau_wrapper.c
@@ -117,25 +117,23 @@
         vdpau_driver = "nvidia";
     }
 
+    _vdp_driver_dll = NULL;
     if (snprintf(vdpau_driver_lib, sizeof(vdpau_driver_lib), DRIVER_LIB_FORMAT,
                  VDPAU_MODULEDIR "/", vdpau_driver, ".1") >=
             sizeof(vdpau_driver_lib)) {
         fprintf(stderr, "Failed to construct driver path: path too long\n");
-        if (vdpau_driver_dri2) {
-            XFree(vdpau_driver_dri2);
-            vdpau_driver_dri2 = NULL;
-        }
-        _VDP_ERROR_BREAKPOINT();
-        return VDP_STATUS_NO_IMPLEMENTATION;
+    } else {
+        _vdp_driver_dll = dlopen(vdpau_driver_lib, RTLD_NOW | RTLD_GLOBAL);
     }
 
-    _vdp_driver_dll = dlopen(vdpau_driver_lib, RTLD_NOW | RTLD_GLOBAL);
     if (!_vdp_driver_dll) {
-        /* Try again using the old path, which is guaranteed to fit in PATH_MAX
-         * if the complete path fit above. */
-        snprintf(vdpau_driver_lib, sizeof(vdpau_driver_lib), DRIVER_LIB_FORMAT,
-                 "", vdpau_driver, "");
-        _vdp_driver_dll = dlopen(vdpau_driver_lib, RTLD_NOW | RTLD_GLOBAL);
+        /* Try again using the old path. */
+        if (snprintf(vdpau_driver_lib, sizeof(vdpau_driver_lib), DRIVER_LIB_FORMAT,
+                     "", vdpau_driver, "") >= sizeof(vdpau_driver_lib)) {
+            fprintf(stderr, "Failed to construct driver path: path too long\n");
+        } else {
+            _vdp_driver_dll = dlopen(vdpau_driver_lib, RTLD_NOW | RTLD_GLOBAL);
+        }
     }
 
     if (vdpau_driver_dri2) {