[PATCH 3/4] argv_array: add argv_array_copy

[Stefan Beller <sbeller@google.com>]

The copied argv array shall be an identical deep copy except for
the internal allocation value.

CC: Jeff King <peff@peff.net>
Signed-off-by: Stefan Beller <sbeller@google.com>
---
 argv-array.c | 13 +++++++++++++
 argv-array.h |  1 +
 2 files changed, 14 insertions(+)

diff --git a/argv-array.c b/argv-array.c
index 256741d..6d9c1dd 100644
--- a/argv-array.c
+++ b/argv-array.c
@@ -68,3 +68,16 @@ void argv_array_clear(struct argv_array *array)
 	}
 	argv_array_init(array);
 }
+
+void argv_array_copy(struct argv_array *src, struct argv_array *dst)
+{
+	int i;
+
+	dst->argv = xmalloc((src->argc + 1) * sizeof(*dst->argv));
+	dst->argc = src->argc;
+	dst->alloc = src->argc;
+	for (i = 0; i < dst->argc ; i++)
+		dst->argv[i] = xstrdup(src->argv[i]);
+	dst->argv[dst->argc] = NULL;
+}
+
diff --git a/argv-array.h b/argv-array.h
index c65e6e8..247627da 100644
--- a/argv-array.h
+++ b/argv-array.h
@@ -19,5 +19,6 @@ LAST_ARG_MUST_BE_NULL
 void argv_array_pushl(struct argv_array *, ...);
 void argv_array_pop(struct argv_array *);
 void argv_array_clear(struct argv_array *);
+void argv_array_copy(struct argv_array *src, struct argv_array *dst);
 
 #endif /* ARGV_ARRAY_H */
-- 
2.5.0.239.g9728e1d.dirty