SUpport old style -[::digit::] options for head and tail

Also make head behave like GNU head (-0/-n 0 is valid)

diff --git a/coreutils/head.c b/coreutils/head.c
index 4a16771..c5c11fc 100644 (file)
--- a/coreutils/head.c
+++ b/coreutils/head.c
@@ -47,12 +47,17 @@ int head_main(int argc, char **argv)
        FILE *fp;
        int need_headers, opt, len = 10, status = EXIT_SUCCESS;
 
+       if (( argc >= 2 ) && ( strlen ( argv [1] ) >= 2 ) && ( argv [1][0] == '-' ) && isdigit ( argv [1][1] )) {
+               len = atoi ( &argv [1][1] );
+               optind = 2;
+       }
+
        /* parse argv[] */
        while ((opt = getopt(argc, argv, "n:")) > 0) {
                switch (opt) {
                case 'n':
                        len = atoi(optarg);
-                       if (len >= 1)
+                       if (len >= 0)
                                break;
                        /* fallthrough */
                default:

diff --git a/coreutils/tail.c b/coreutils/tail.c
index 0c8dec2..8201c80 100644 (file)
--- a/coreutils/tail.c
+++ b/coreutils/tail.c
@@ -68,6 +68,11 @@ 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] )) {
+               count = atoi ( &argv [1][1] );
+               optind = 2;
+       }
+
        while ((opt = getopt(argc, argv, "c:fhn:q:s:v")) > 0) {
                switch (opt) {
                        case 'f':