[PATCH] builtin-archive: insert --format before double dash if necessary.

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Reported-by: Ilari Liusvaara <ilari.liusvaara@xxxxxxxxxxx>
Signed-off-by: Miklos Vajna <vmiklos@xxxxxxxxxxxxxx>
---

What about this fix?

 builtin-archive.c |   23 ++++++++++++++++++++++-
 1 files changed, 22 insertions(+), 1 deletions(-)

diff --git a/builtin-archive.c b/builtin-archive.c
index 12351e9..ffbc9b0 100644
--- a/builtin-archive.c
+++ b/builtin-archive.c
@@ -104,14 +104,35 @@ int cmd_archive(int argc, const char **argv, const char *prefix)
 	}
 
 	if (format) {
+		int i, found = 0;
+		const char *ptr = NULL;
+
 		sprintf(fmt_opt, "--format=%s", format);
 		/*
 		 * This is safe because either --format and/or --output must
 		 * have been given on the original command line if we get to
 		 * this point, and parse_options() must have eaten at least
 		 * one argument, i.e. we have enough room to append to argv[].
+		 *
+		 * First check if we have to insert the argument before
+		 * two dashes.
 		 */
-		argv[argc++] = fmt_opt;
+		for (i = 0; i < argc; i++) {
+			if (found) {
+				const char *tmp = argv[i];
+				argv[i] = ptr;
+				ptr = tmp;
+			} else if (!strcmp(argv[i], "--")) {
+				found = 1;
+				ptr = argv[i];
+				argv[i] = fmt_opt;
+				argc++;
+			}
+		}
+
+		/* No double dash? Then just append it to the end of the list. */
+		if (!found)
+			argv[argc++] = fmt_opt;
 		argv[argc] = NULL;
 	}
 
-- 
1.6.5.2

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