fiptool: Factor out setting of image descriptor action

An image descriptor contains an action and an argument.  The action
indicates the intended operation, as requested by the user.  It can be
pack, unpack or remove.  Factor out setting those fields to a separate
function to minimize code duplication across the various commands that
modify these fields.

Change-Id: I1682958e8e83c4884e435cff6d0833c67726461f
Signed-off-by: dp-arm <dimitris.papastamos@arm.com>

tools/fiptool/fiptool.c

@@ -172,6 +172,20 @@ static image_desc_t *new_image_desc(const uuid_t *uuid,
 	return desc;
 }
 
+static void set_image_desc_action(image_desc_t *desc, int action,
+    const char *arg)
+{
+	assert(desc != NULL);
+
+	if (desc->action_arg != DO_UNSPEC)
+		free(desc->action_arg);
+	desc->action = action;
+	desc->action_arg = NULL;
+	if (arg != NULL)
+		desc->action_arg = xstrdup(arg,
+		    "failed to allocate memory for argument");
+}
+
 static void free_image_desc(image_desc_t *desc)
 {
 	free(desc->name);
@@ -712,12 +726,7 @@ static int create_cmd(int argc, char *argv[])
 			image_desc_t *desc;
 
 			desc = lookup_image_desc_from_opt(opts[opt_index].name);
-			assert(desc != NULL);
-			if (desc->action != DO_UNSPEC)
-				free(desc->action_arg);
-			desc->action = DO_PACK;
-			desc->action_arg = xstrdup(optarg,
-			    "failed to allocate memory for argument");
+			set_image_desc_action(desc, DO_PACK, optarg);
 			break;
 		}
 		case OPT_PLAT_TOC_FLAGS:
@@ -737,20 +746,12 @@ static int create_cmd(int argc, char *argv[])
 				create_usage();
 
 			desc = lookup_image_desc_from_uuid(&uuid);
-			if (desc != NULL) {
-				if (desc->action != DO_UNSPEC)
-					free(desc->action_arg);
-				desc->action = DO_PACK;
-				desc->action_arg = xstrdup(filename,
-				    "failed to allocate memory for argument");
-			} else {
+			if (desc == NULL) {
 				uuid_to_str(name, sizeof(name), &uuid);
 				desc = new_image_desc(&uuid, name, "blob");
-				desc->action = DO_PACK;
-				desc->action_arg = xstrdup(filename,
-				    "failed to allocate memory for argument");
 				add_image_desc(desc);
 			}
+			set_image_desc_action(desc, DO_PACK, filename);
 			break;
 		}
 		default:
@@ -820,12 +821,7 @@ static int update_cmd(int argc, char *argv[])
 			image_desc_t *desc;
 
 			desc = lookup_image_desc_from_opt(opts[opt_index].name);
-			assert(desc != NULL);
-			if (desc->action != DO_UNSPEC)
-				free(desc->action_arg);
-			desc->action = DO_PACK;
-			desc->action_arg = xstrdup(optarg,
-			    "failed to allocate memory for argument");
+			set_image_desc_action(desc, DO_PACK, optarg);
 			break;
 		}
 		case OPT_PLAT_TOC_FLAGS:
@@ -846,20 +842,12 @@ static int update_cmd(int argc, char *argv[])
 				update_usage();
 
 			desc = lookup_image_desc_from_uuid(&uuid);
-			if (desc != NULL) {
-				if (desc->action != DO_UNSPEC)
-					free(desc->action_arg);
-				desc->action = DO_PACK;
-				desc->action_arg = xstrdup(filename,
-				    "failed to allocate memory for argument");
-			} else {
+			if (desc == NULL) {
 				uuid_to_str(name, sizeof(name), &uuid);
 				desc = new_image_desc(&uuid, name, "blob");
-				desc->action = DO_PACK;
-				desc->action_arg = xstrdup(filename,
-				    "failed to allocate memory for argument");
 				add_image_desc(desc);
 			}
+			set_image_desc_action(desc, DO_PACK, filename);
 			break;
 		}
 		case 'o':
@@ -942,12 +930,7 @@ static int unpack_cmd(int argc, char *argv[])
 			image_desc_t *desc;
 
 			desc = lookup_image_desc_from_opt(opts[opt_index].name);
-			assert(desc != NULL);
-			if (desc->action != DO_UNSPEC)
-				free(desc->action_arg);
-			desc->action = DO_UNPACK;
-			desc->action_arg = xstrdup(optarg,
-			    "failed to allocate memory for argument");
+			set_image_desc_action(desc, DO_UNPACK, optarg);
 			unpack_all = 0;
 			break;
 		}
@@ -965,20 +948,12 @@ static int unpack_cmd(int argc, char *argv[])
 				unpack_usage();
 
 			desc = lookup_image_desc_from_uuid(&uuid);
-			if (desc != NULL) {
-				if (desc->action != DO_UNSPEC)
-					free(desc->action_arg);
-				desc->action = DO_UNPACK;
-				desc->action_arg = xstrdup(filename,
-				    "failed to allocate memory for argument");
-			} else {
+			if (desc == NULL) {
 				uuid_to_str(name, sizeof(name), &uuid);
 				desc = new_image_desc(&uuid, name, "blob");
-				desc->action = DO_UNPACK;
-				desc->action_arg = xstrdup(filename,
-				    "failed to allocate memory for argument");
 				add_image_desc(desc);
 			}
+			set_image_desc_action(desc, DO_UNPACK, filename);
 			unpack_all = 0;
 			break;
 		}
@@ -1094,9 +1069,7 @@ static int remove_cmd(int argc, char *argv[])
 			image_desc_t *desc;
 
 			desc = lookup_image_desc_from_opt(opts[opt_index].name);
-			assert(desc != NULL);
-			desc->action = DO_REMOVE;
-			desc->action_arg = NULL;
+			set_image_desc_action(desc, DO_REMOVE, NULL);
 			break;
 		}
 		case 'b': {
@@ -1111,16 +1084,12 @@ static int remove_cmd(int argc, char *argv[])
 				remove_usage();
 
 			desc = lookup_image_desc_from_uuid(&uuid);
-			if (desc != NULL) {
-				desc->action = DO_REMOVE;
-				desc->action_arg = NULL;
-			} else {
+			if (desc == NULL) {
 				uuid_to_str(name, sizeof(name), &uuid);
 				desc = new_image_desc(&uuid, name, "blob");
-				desc->action = DO_REMOVE;
-				desc->action_arg = NULL;
 				add_image_desc(desc);
 			}
+			set_image_desc_action(desc, DO_REMOVE, NULL);
 			break;
 		}
 		case 'f':