[hackers] [sbase] Print header in tail(1) || sin

[git]

commit d221e5ea5b859df9805e14aaf99c644750c6da6a
Author: sin <s...@2f30.org>
Date:   Thu Nov 20 23:09:14 2014 +0000

    Print header in tail(1)

diff --git a/tail.c b/tail.c
index b3a8b30..c2bc6eb 100644
--- a/tail.c
+++ b/tail.c
@@ -24,6 +24,7 @@ main(int argc, char *argv[])
        void (*tail)(FILE *, const char *, long) = taketail;
        char *lines;
        int ret = 0;
+       int newline, many;
 
        ARGBEGIN {
        case 'n':
@@ -41,12 +42,17 @@ main(int argc, char *argv[])
        if (argc == 0) {
                tail(stdin, "<stdin>", n);
        } else {
-               for (; argc > 0; argc--, argv++) {
+               many = argc > 1;
+               for (newline = 0; argc > 0; argc--, argv++) {
                        if (!(fp = fopen(argv[0], "r"))) {
                                weprintf("fopen %s:", argv[0]);
                                ret = 1;
                                continue;
                        }
+                       if (many)
+                               printf("%s==> %s <==\n",
+                                      newline ? "\n" : "", argv[0]);
+                       newline = 1;
                        tail(fp, argv[0], n);
                        fclose(fp);
                }