Fix funny types used in attribute value representation

It was bothering me a lot that I abused small integer values
casted to (void *) to represent non string values in
gitattributes.  This corrects it by making the type of attribute
values (const char *), and using the address of a few statically
allocated character buffer to denote true/false.  Unset attributes
are represented as having NULLs as their values.

Added in-header documentation to explain how git_checkattr()
routine should be called.

Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/builtin-check-attr.c b/builtin-check-attr.c
index 6983a73c1..9d77f76ff 100644
--- a/builtin-check-attr.c
+++ b/builtin-check-attr.c
@@ -42,7 +42,7 @@ int cmd_check_attr(int argc, const char **argv, const char *prefix)
 		if (git_checkattr(argv[i], cnt, check))
 			die("git_checkattr died");
 		for (j = 0; j < cnt; j++) {
-			void *value = check[j].value;
+			const char *value = check[j].value;
 
 			if (ATTR_TRUE(value))
 				value = "set";
@@ -52,7 +52,7 @@ int cmd_check_attr(int argc, const char **argv, const char *prefix)
 				value = "unspecified";
 
 			write_name_quoted("", 0, argv[i], 1, stdout);
-			printf(": %s: %s\n", argv[j+1], (char *) value);
+			printf(": %s: %s\n", argv[j+1], value);
 		}
 	}
 	return 0;