* libmisc/strtoday.c: Add support for numerical dates, assuming

they are already specified in number of days since Epoch. Return
	-2 in case of errors to support the specification of -1.
	* src/usermod.c, src/useradd.c: Adapt to the new error value of
	strtoday().
	* src/chage.c:  Remove isnum(). Adapt to the new error value of
	strtoday(). Support for numerical dates is moved to strtoday().

libmisc/strtoday.c

@@ -36,6 +36,8 @@
 
 #include <config.h>
 
+#include <ctype.h>
+
 #ident "$Id$"
 
 #include "defines.h"
@@ -44,6 +46,7 @@
 #ifndef USE_GETDATE
 #define USE_GETDATE 1
 #endif
+
 #if USE_GETDATE
 #include "getdate.h"
 /*
@@ -63,6 +66,8 @@
 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,
@@ -70,12 +75,35 @@ long strtoday (const char *str)
 	 * (useradd sets sp_expire = current date for new lusers)
 	 */
 	if ((NULL == str) || ('\0' == *str)) {
-		return -1;
+		return -2;
 	}
 
-	t = get_date (str, (time_t *) 0);
+	/* 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 (getlong (str, &retdate) == 0) {
+			return -2;
+		}
+		return retdate;
+	}
+
+	t = get_date (str, NULL);
 	if ((time_t) - 1 == t) {
-		return -1;
+		return -2;
 	}
 	/* convert seconds to days since 1970-01-01 */
 	return (long) (t + DAY / 2) / DAY;