1 files changed, 77 insertions, 0 deletions
diff --git a/lib/strtoday.c b/lib/strtoday.c
new file mode 100644
index 0000000..dabd5b5
--- /dev/null
+++ b/lib/strtoday.c
@@ -0,0 +1,77 @@
+/*
+ * SPDX-FileCopyrightText: 1991 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 1999, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2008       , Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#include <ctype.h>
+
+#ident "$Id$"
+
+#include "atoi/str2i.h"
+#include "prototypes.h"
+#include "getdate.h"
+
+
+/*
+ * strtoday() now uses get_date() (borrowed from GNU shellutils)
+ * which can handle many date formats, for example:
+ *	1970-09-17	# ISO 8601.
+ *	70-9-17		# This century assumed by default.
+ *	70-09-17	# Leading zeros are ignored.
+ *	9/17/72		# Common U.S. writing.
+ *	24 September 1972
+ *	24 Sept 72	# September has a special abbreviation.
+ *	24 Sep 72	# Three-letter abbreviations always allowed.
+ *	Sep 24, 1972
+ *	24-sep-72
+ *	24sep72
+ */
+long strtoday (const char *str)
+{
+	time_t t;
+	bool isnum = true;
+	const char *s = str;
+
+	/*
+	 * get_date() interprets an empty string as the current date,
+	 * which is not what we expect, unless you're a BOFH :-).
+	 * (useradd sets sp_expire = current date for new lusers)
+	 */
+	if ((NULL == str) || ('\0' == *str)) {
+		return -1;
+	}
+
+	/* If a numerical value is provided, this is already a number of
+	 * days since EPOCH.
+	 */
+	if ('-' == *s) {
+		s++;
+	}
+	while (' ' == *s) {
+		s++;
+	}
+	while (isnum && ('\0' != *s)) {
+		if (!isdigit (*s)) {
+			isnum = false;
+		}
+		s++;
+	}
+	if (isnum) {
+		long retdate;
+		if (str2sl(&retdate, str) == -1)
+			return -2;
+		return retdate;
+	}
+
+	t = get_date(str, NULL);
+	if ((time_t) - 1 == t) {
+		return -2;
+	}
+	return t / DAY;
+}