cut: diagnose a range starting with 0 (-f 0-2) as invalid, and

give a better diagnostic for a field-number/offset of 0.
* NEWS: Mention the fix.
* src/cut.c (ADD_RANGE_PAIR): Add an explicit check for 0.
Based on a patch from James Youngman.
* tests/misc/cut: Add tests for the above.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/cut.c b/src/cut.c
index ab14abcb2..e89460e1b 100644
--- a/src/cut.c
+++ b/src/cut.c
@@ -57,6 +57,8 @@
 #define ADD_RANGE_PAIR(rp, low, high)			\
   do							\
     {							\
+      if (low == 0 || high == 0)			\
+	FATAL_ERROR (_("fields and positions are numbered from 1")); \
       if (n_rp >= n_rp_allocated)			\
 	{						\
 	  (rp) = X2NREALLOC (rp, &n_rp_allocated);	\