argv-array: implement argv_array_pushv()

When we have a null-terminated array, it would be useful to convert it
or append it to an argv_array for further manipulation.

Implement argv_array_pushv() which will push a null-terminated array of
strings on to an argv_array.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/technical/api-argv-array.txt

@@ -46,6 +46,9 @@ Functions
 	Format a string and push it onto the end of the array. This is a
 	convenience wrapper combining `strbuf_addf` and `argv_array_push`.
 
+`argv_array_pushv`::
+	Push a null-terminated array of strings onto the end of the array.
+
 `argv_array_pop`::
 	Remove the final element from the array. If there are no
 	elements in the array, do nothing.

argv-array.c

@@ -49,6 +49,12 @@ void argv_array_pushl(struct argv_array *array, ...)
 	va_end(ap);
 }
 
+void argv_array_pushv(struct argv_array *array, const char **argv)
+{
+	for (; *argv; argv++)
+		argv_array_push(array, *argv);
+}
+
 void argv_array_pop(struct argv_array *array)
 {
 	if (!array->argc)

argv-array.h

@@ -17,6 +17,7 @@ __attribute__((format (printf,2,3)))
 void argv_array_pushf(struct argv_array *, const char *fmt, ...);
 LAST_ARG_MUST_BE_NULL
 void argv_array_pushl(struct argv_array *, ...);
+void argv_array_pushv(struct argv_array *, const char **);
 void argv_array_pop(struct argv_array *);
 void argv_array_clear(struct argv_array *);