fail on null owner names (4.3BSD/etc/127)

SCCS-vsn: usr.sbin/chown/chown.c 5.7

diff --git a/usr/src/usr.sbin/chown/chown.c b/usr/src/usr.sbin/chown/chown.c
index 0b9b996..443251d 100644 (file)
--- a/usr/src/usr.sbin/chown/chown.c
+++ b/usr/src/usr.sbin/chown/chown.c
@@ -11,7 +11,7 @@ char copyright[] =
 #endif
 
 #ifndef lint
 #endif
 
 #ifndef lint

-static char sccsid[] = "@(#)chown.c    5.6 (Berkeley) %G%";
+static char sccsid[] = "@(#)chown.c    5.7 (Berkeley) %G%";

 #endif
 
 /*
 #endif
 
 /*


@@ -104,6 +104,8 @@ isnumber(s)
 {
        register c;
 
 {
        register c;
 

+       if (*s == '\0')
+               return 0;

        while(c = *s++)
                if (!isdigit(c))
                        return (0);
        while(c = *s++)
                if (!isdigit(c))
                        return (0);