[PATCH 11/14] opt_arg(): report errors parsing option values

[Michael Haggerty <mhagger@alum.mit.edu>]

If an argument is there, but it can't be parsed as a non-positive
number, then die() rather than returning 0.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
---
 diff.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/diff.c b/diff.c
index 77c7acb..03cdabf 100644
--- a/diff.c
+++ b/diff.c
@@ -3368,7 +3368,7 @@ static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *va
 		if (!c)
 			return 1; /* optional argument was missing */
 		if (convert_i(arg, 10, val))
-			return 0;
+			die("The value for -%c must be a non-negative integer", arg_short);
 		return 1;
 	}
 	if (c != '-')
@@ -3381,7 +3381,7 @@ static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *va
 	if (!*eq)
 		return 1; /* '=' and optional argument were missing */
 	if (convert_i(eq + 1, 10, val))
-		return 0;
+		die("The value for --%s must be a non-negative integer", arg_long);
 	return 1;
 }
 
-- 
2.1.4