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-rw-r--r--lib/tz.c58
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diff --git a/lib/tz.c b/lib/tz.c
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+/*
+ * 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 */
+