Imported Upstream version 93u+upstream

1 files changed, 46 insertions, 0 deletions

diff --git a/src/lib/libdll/dlllook.c b/src/lib/libdll/dlllook.c
new file mode 100644
index 0000000..10928a6
--- /dev/null
+++ b/src/lib/libdll/dlllook.c
@@ -0,0 +1,46 @@
+/***********************************************************************
+*                                                                      *
+*               This software is part of the ast package               *
+*          Copyright (c) 1997-2011 AT&T Intellectual Property          *
+*                      and is licensed under the                       *
+*                 Eclipse Public License, Version 1.0                  *
+*                    by AT&T Intellectual Property                     *
+*                                                                      *
+*                A copy of the License is available at                 *
+*          http://www.eclipse.org/org/documents/epl-v10.html           *
+*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
+*                                                                      *
+*              Information and Software Systems Research               *
+*                            AT&T Research                             *
+*                           Florham Park NJ                            *
+*                                                                      *
+*                 Glenn Fowler <gsf@research.att.com>                  *
+*                                                                      *
+***********************************************************************/
+#pragma prototyped
+/*
+ * Glenn Fowler
+ * AT&T Research
+ */
+
+#include <ast.h>
+#include <dlldefs.h>
+
+/*
+ * dlsym() with `_' weak fallback
+ */
+
+void*
+dlllook(void* dll, const char* name)
+{
+	register void*	addr;
+	char		buf[256];
+
+	if (!(addr = dlsym(dll, name)) && strlen(name) < (sizeof(buf) - 2))
+	{
+		buf[0] = '_';
+		strcpy(buf + 1, name);
+		addr = dlsym(dll, buf);
+	}
+	return addr;
+}