make sql_udf.cc to shorten dlerror() messages

just as sql_plugin.cc does

1 files changed, 31 insertions, 0 deletions

diff --git a/mysys/my_dlerror.c b/mysys/my_dlerror.c
new file mode 100644
index 00000000000..db21b7fc274
--- /dev/null
+++ b/mysys/my_dlerror.c
@@ -0,0 +1,31 @@
+/*
+   Copyright (c) 2017, MariaDB
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */
+
+#include <my_global.h>
+#include <string.h>
+
+const char *my_dlerror(const char *dlpath)
+{
+  const char *errmsg=dlerror();
+  size_t dlpathlen= strlen(dlpath);
+  if (!strncmp(dlpath, errmsg, dlpathlen))
+  { /* if errmsg starts from dlpath, trim this prefix */
+    errmsg+=dlpathlen;
+    if (*errmsg == ':') errmsg++;
+    if (*errmsg == ' ') errmsg++;
+  }
+  return errmsg;
+}