[hackers] [sbase] tail: Fix tail -n -val to handle leading spaces || sin

[git]

commit 91c859db36f609e5fa85924054c7cba3dc5daeab
Author: sin <s...@2f30.org>
Date:   Mon Feb 9 16:01:25 2015 +0000

    tail: Fix tail -n -val to handle leading spaces
    
    Previously 'tail -n "    -20" foo' was broken, now it works.

diff --git a/tail.c b/tail.c
index 9f5bd4f..2265bac 100644
--- a/tail.c
+++ b/tail.c
@@ -74,8 +74,7 @@ main(int argc, char *argv[])
                break;
        case 'n':
                lines = EARGF(usage());
-               n = estrtonum(lines[0] == '-' ? lines + 1 : lines,
-                             0, MIN(LLONG_MAX, SIZE_MAX));
+               n = MIN(llabs(estrtonum(lines, LLONG_MIN + 1, MIN(LLONG_MAX, 
SIZE_MAX))), SIZE_MAX);
                if (lines[0] == '+')
                        tail = dropinit;
                break;