[hackers] [sbase] sort: allow keys where start_col > end_col || Jakob Kramer

[git]

commit 403b047a3043000953241ffd5fc67437e9ba117e
Author: Jakob Kramer <jakob.kra...@gmx.de>
Date:   Sun Apr 5 21:36:04 2015 +0200

    sort: allow keys where start_col > end_col
    
    Useful in (rare) cases like:
    
        $ printf 'aaaa c\nx a\n0 b\n' | sort -k 2,1.3
    
    And this is how POSIX wants it.

diff --git a/sort.c b/sort.c
index 3697b42..901189e 100644
--- a/sort.c
+++ b/sort.c
@@ -157,7 +157,7 @@ parse_keydef(struct keydef *kd, char *s, int flags)
                return -1;
        if (*rest == ',') {
                kd->end_column = strtol(rest+1, &rest, 10);
-               if (kd->end_column && kd->end_column < kd->start_column)
+               if (kd->end_column < 1)
                        return -1;
                if (*rest == '.') {
                        kd->end_char = strtol(rest+1, &rest, 10);