1 files changed, 58 insertions, 0 deletions
diff --git a/lib/tz.c b/lib/tz.c
new file mode 100644
index 0000000..83b295c
--- /dev/null
+++ b/lib/tz.c
@@ -0,0 +1,58 @@
+/*
+ * SPDX-FileCopyrightText: 1991 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1991 - 1994, Chip Rosenthal
+ * SPDX-FileCopyrightText: 1996 - 1998, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007 - 2010, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ifndef USE_PAM
+
+#ident "$Id$"
+
+#include <stdio.h>
+#include <string.h>
+#include "defines.h"
+#include "prototypes.h"
+#include "getdef.h"
+
+/*
+ * tz - return local timezone name
+ *
+ * tz() determines the name of the local timezone by reading the
+ * contents of the file named by ``fname''.
+ */
+/*@observer@*/const char *tz (const char *fname)
+{
+	FILE *fp = NULL;
+	static char tzbuf[BUFSIZ];
+	const char *def_tz = "TZ=CST6CDT";
+
+	fp = fopen (fname, "r");
+	if (   (NULL == fp)
+	    || (fgets (tzbuf, sizeof (tzbuf), fp) == NULL)) {
+		def_tz = getdef_str ("ENV_TZ");
+		if ((NULL == def_tz) || ('/' == def_tz[0])) {
+			def_tz = "TZ=CST6CDT";
+		}
+
+		strcpy (tzbuf, def_tz);
+	} else {
+		/* Remove optional trailing '\n'. */
+		tzbuf[strcspn (tzbuf, "\n")] = '\0';
+	}
+
+	if (NULL != fp) {
+		(void) fclose (fp);
+	}
+
+	return tzbuf;
+}
+#else				/* !USE_PAM */
+extern int ISO_C_forbids_an_empty_translation_unit;
+#endif				/* !USE_PAM */
+