Imported Upstream version 93u+upstream

1 files changed, 85 insertions, 0 deletions

diff --git a/src/lib/libdll/dllcheck.c b/src/lib/libdll/dllcheck.c
new file mode 100644
index 0000000..c18f83e
--- /dev/null
+++ b/src/lib/libdll/dllcheck.c
@@ -0,0 +1,85 @@
+/***********************************************************************
+*                                                                      *
+*               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 "dlllib.h"
+
+/*
+ * return plugin version for dll
+ * 0 if there is none
+ * path!=0 enables library level diagnostics
+ */
+
+extern unsigned long
+dllversion(void* dll, const char* path)
+{
+	Dll_plugin_version_f	pvf;
+
+	if (pvf = (Dll_plugin_version_f)dlllook(dll, "plugin_version"))
+		return (*pvf)();
+	if (path)
+	{
+		state.error = 1;
+		sfsprintf(state.errorbuf, sizeof(state.errorbuf), "plugin_version() not found");
+		errorf("dll", NiL, 1, "%s: %s", path, state.errorbuf);
+	}
+	return 0;
+}
+
+/*
+ * check if dll on path has plugin version >= ver
+ * 1 returned on success, 0 on failure
+ * path!=0 enables library level diagnostics
+ * cur!=0 gets actual version
+ */
+
+extern int
+dllcheck(void* dll, const char* path, unsigned long ver, unsigned long* cur)
+{
+	unsigned long		v;
+	Dll_plugin_version_f	pvf;
+
+	state.error = 0;
+	if (ver || cur)
+	{
+		v = dllversion(dll, path);
+		if (cur)
+			*cur = v;
+	}
+	if (!ver)
+		return 1;
+	if (!v)
+		return 0;
+	if (v < ver)
+	{
+		if (path)
+		{
+			state.error = 1;
+			sfsprintf(state.errorbuf, sizeof(state.errorbuf), "plugin version %lu older than caller %lu", v, ver);
+			errorf("dll", NiL, 1, "%s: %s", path, state.errorbuf);
+		}
+		return 0;
+	}
+	return 1;
+}