cut: do not accept the invalid range 0-

The command "echo 12345 | cut -b 0-" prints an empty line while
it should fail with "fields and positions are numbered from 1".

* src/cut.c (set_fields): Add a diagnostic for the invalid open
range which starts with Zero, i.e., the range 0-.
* tests/misc/cut.pl: Add tests to ensure the range 0- fails for
fields (-f) and for positions (-b, -c).
* NEWS: Mention the fix.

Reported by Marcel Böhme in <http://bugs.gnu.org/12903>.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/cut.c b/src/cut.c
index 87380ac66..2a571483a 100644
--- a/src/cut.c
+++ b/src/cut.c
@@ -369,6 +369,9 @@ set_fields (const char *fieldstr)
           dash_found = true;
           fieldstr++;
 
+          if (lhs_specified && !value)
+            FATAL_ERROR (_("fields and positions are numbered from 1"));
+
           initial = (lhs_specified ? value : 1);
           value = 0;
         }