Added include for isdigit(); simplified -<num> detection

1 files changed, 2 insertions, 1 deletions

diff --git a/coreutils/tail.c b/coreutils/tail.c
index 8201c80a0..024441e73 100644
--- a/coreutils/tail.c
+++ b/coreutils/tail.c
@@ -25,6 +25,7 @@
 #include <fcntl.h>
 #include <getopt.h>
 #include <string.h>
+#include <ctype.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <sys/types.h>
@@ -68,7 +69,7 @@ int tail_main(int argc, char **argv)
         char *s, *start, *end, buf[BUFSIZ];
         int i, opt;
 
-        if (( argc >= 2 ) && ( strlen ( argv [1] ) >= 2 ) && ( argv [1][0] == '-' ) && isdigit ( argv [1][1] )) {
+        if (( argc >= 2 ) && ( argv [1][0] == '-' ) && isdigit ( argv [1][1] )) {
                 count = atoi ( &argv [1][1] );
                 optind = 2;
         }