[PATCH 4/4] handle_options(): do not miscount how many arguments were used

[Jeff King <peff@peff.net>]

From: Junio C Hamano <gitster@pobox.com>

The handle_options() function advances the base of the argument array and
returns the number of arguments it used. The caller in handle_alias()
wants to reallocate the argv array it passes to this function, and
attempts to do so by subtracting the returned value to compensate for the
change handle_options() makes to the new_argv.

But handle_options() did not correctly count when "-c <config=value>" is
given, causing a wrong pointer to be passed to realloc().

Fix it by saving the original argv at the beginning of handle_options(),
and return the difference between the final value of argv, which will
relieve the places that move the array pointer from the additional burden
of keeping track of "handled" counter.

Noticed-by: Kazuki Tsujimoto
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Jeff King <peff@peff.net>
---
 git.c                  |    6 ++----
 t/t1300-repo-config.sh |    2 +-
 2 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/git.c b/git.c
index a5ef3c6..89721d4 100644
--- a/git.c
+++ b/git.c
@@ -66,7 +66,7 @@ static void commit_pager_choice(void) {
 
 static int handle_options(const char ***argv, int *argc, int *envchanged)
 {
-	int handled = 0;
+	const char **orig_argv = *argv;
 
 	while (*argc > 0) {
 		const char *cmd = (*argv)[0];
@@ -122,7 +122,6 @@ static int handle_options(const char ***argv, int *argc, int *envchanged)
 				*envchanged = 1;
 			(*argv)++;
 			(*argc)--;
-			handled++;
 		} else if (!prefixcmp(cmd, "--git-dir=")) {
 			setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
 			if (envchanged)
@@ -162,9 +161,8 @@ static int handle_options(const char ***argv, int *argc, int *envchanged)
 
 		(*argv)++;
 		(*argc)--;
-		handled++;
 	}
-	return handled;
+	return (*argv) - orig_argv;
 }
 
 static int handle_alias(int *argcp, const char ***argv)
diff --git a/t/t1300-repo-config.sh b/t/t1300-repo-config.sh
index fe7a153..3db5626 100755
--- a/t/t1300-repo-config.sh
+++ b/t/t1300-repo-config.sh
@@ -897,7 +897,7 @@ test_expect_success 'key sanity-checking' '
 	git config foo."ba =z".bar false
 '
 
-test_expect_failure 'git -c works with aliases of builtins' '
+test_expect_success 'git -c works with aliases of builtins' '
 	git config alias.checkconfig "-c foo.check=bar config foo.check" &&
 	echo bar >expect &&
 	git checkconfig >actual &&
-- 
1.7.4.5.7.g2e01