Bug #11754014: 45549: udf plugin_dir path separator inconsistency

  and cryptic error 1126 message

The problem was that dlopen() related code was using just a subset 
of the path normalization routines used in other places.
Fixed the expansion of the pre-dlopen() behavior for plugins and UDFs
to use a platform-dependent consistent encoding of the paths.
Fixed the error dlopen() error handling to take the correct error message
and strip off the trailing newline character(s).
Fixed tests to do a platform independent replace of directories and to 
account for the traling slash.

1 files changed, 23 insertions, 3 deletions

diff --git a/include/my_global.h b/include/my_global.h
index 924c83cd951..11ff377c706 100644
--- a/include/my_global.h
+++ b/include/my_global.h
@@ -1364,11 +1364,31 @@ do { doubleget_union _tmp; \
 
 #ifndef HAVE_DLERROR
 #ifdef _WIN32
+#define DLERROR_GENERATE(errmsg, error_number) \
+  char win_errormsg[2048]; \
+  if(FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, \
+                   0, error_number, 0, win_errormsg, 2048, NULL)) \
+  { \
+    char *ptr; \
+    for (ptr= &win_errormsg[0] + strlen(win_errormsg) - 1; \
+         ptr >= &win_errormsg[0] && strchr("\r\n\t\0x20", *ptr); \
+         ptr--) \
+      *ptr= 0; \
+    errmsg= win_errormsg; \
+  } \
+  else \
+    errmsg= ""
 #define dlerror() ""
-#else
+#define dlopen_errno GetLastError()
+#else /* _WIN32 */
 #define dlerror() "No support for dynamic loading (static build?)"
-#endif
-#endif
+#define DLERROR_GENERATE(errmsg, error_number) errmsg= dlerror()
+#define dlopen_errno errno
+#endif /* _WIN32 */
+#else /* HAVE_DLERROR */
+#define DLERROR_GENERATE(errmsg, error_number) errmsg= dlerror()
+#define dlopen_errno errno
+#endif /* HAVE_DLERROR */
 
 
 /*