describe: use argv-array

Instead of using a hand allocated args[] array, use argv-array API
to manage the dynamically created list of arguments when invoking
name-rev.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/describe.c b/builtin/describe.c
index 4e675c3d0d7b1daeb7f12ef425514a11a92a5c3f..db41cd7974698aeb70b91d48a36b09ce2e558ef1 100644 (file)
--- a/builtin/describe.c
+++ b/builtin/describe.c
@@ -7,6 +7,7 @@
 #include "parse-options.h"
 #include "diff.h"
 #include "hash.h"
+#include "argv-array.h"
 
 #define SEEN           (1u<<0)
 #define MAX_TAGS       (FLAG_BITS - 1)
@@ -442,24 +443,23 @@ int cmd_describe(int argc, const char **argv, const char *prefix)
                die(_("--long is incompatible with --abbrev=0"));
 
        if (contains) {
-               const char **args = xmalloc((7 + argc) * sizeof(char *));
-               int i = 0;
-               args[i++] = "name-rev";
-               args[i++] = "--name-only";
-               args[i++] = "--no-undefined";
+               struct argv_array args;
+
+               argv_array_init(&args);
+               argv_array_pushl(&args, "name-rev", "--name-only", "--no-undefined",
+                                NULL);
                if (always)
-                       args[i++] = "--always";
+                       argv_array_push(&args, "--always");
                if (!all) {
-                       args[i++] = "--tags";
-                       if (pattern) {
-                               char *s = xmalloc(strlen("--refs=refs/tags/") + strlen(pattern) + 1);
-                               sprintf(s, "--refs=refs/tags/%s", pattern);
-                               args[i++] = s;
-                       }
+                       argv_array_push(&args, "--tags");
+                       if (pattern)
+                               argv_array_pushf(&args, "--refs=refs/tags/%s", pattern);
+               }
+               while (*argv) {
+                       argv_array_push(&args, *argv);
+                       argv++;
                }
-               memcpy(args + i, argv, argc * sizeof(char *));
-               args[i + argc] = NULL;
-               return cmd_name_rev(i + argc, args, prefix);
+               return cmd_name_rev(args.argc, args.argv, prefix);
        }
 
        init_hash(&names);