Avoid duplication of sender subcommands.

The list of sender subcommands (add, delete, allow, deny, on, off)
is defined as an enumeration in send.h. This list is duplicated in
check_sender_args() of command.c which contains the six subcommands
as C-strings to be matched against the first word of the sender
command line.

For the code to work properly it is essential that the two subcommand
lists are identical, which is a bad design that is quite error
prone. Fortunately it is easy to avoid the duplication with a little
preprocessor fu.

Since the subcommands are spelled in lower case and there is no
toupper function in CPP, we need to change the subcommand part of the
enumeration constants to lower case. The bulk of the patch consists
in trivial changes of all the users of these constants.

diff --git a/command.c b/command.c
index e8f6948437aac8c0f03b538381afc5ea20b55fe4..3ab34daab035551ab8376e99f1533d6ee974af6c 100644 (file)
--- a/command.c
+++ b/command.c
@@ -167,9 +167,8 @@ static unsigned get_status(struct misc_meta_data *nmmd, int parser_friendly,
 static int check_sender_args(int argc, char * const * argv, struct sender_command_data *scd)
 {
        int i;
-       /* this has to match sender.h */
-       const char *subcmds[] = {"add", "delete", "allow", "deny", "on", "off", NULL};
 
+       const char *subcmds[] = {SENDER_SUBCOMMANDS NULL};
        scd->sender_num = -1;
        if (argc < 3)
                return -E_COMMAND_SYNTAX;
@@ -189,19 +188,19 @@ static int check_sender_args(int argc, char * const * argv, struct sender_comman
        if (!senders[scd->sender_num].client_cmds[scd->cmd_num])
                return -E_SENDER_CMD;
        switch (scd->cmd_num) {
-       case SENDER_ON:
-       case SENDER_OFF:
+       case SENDER_on:
+       case SENDER_off:
                if (argc != 3)
                        return -E_COMMAND_SYNTAX;
                break;
-       case SENDER_DENY:
-       case SENDER_ALLOW:
+       case SENDER_deny:
+       case SENDER_allow:
                if (argc != 4 || parse_cidr(argv[3], scd->host,
                                sizeof(scd->host), &scd->netmask) == NULL)
                        return -E_COMMAND_SYNTAX;
                break;
-       case SENDER_ADD:
-       case SENDER_DELETE:
+       case SENDER_add:
+       case SENDER_delete:
                if (argc != 4)
                        return -E_COMMAND_SYNTAX;
                return parse_fec_url(argv[3], scd);
@@ -364,8 +363,8 @@ static int com_sender(struct command_context *cc)
        }
 
        switch (scd.cmd_num) {
-       case SENDER_ADD:
-       case SENDER_DELETE:
+       case SENDER_add:
+       case SENDER_delete:
                assert(senders[scd.sender_num].resolve_target);
                ret = senders[scd.sender_num].resolve_target(cc->argv[3], &scd);
                if (ret < 0)

diff --git a/dccp_send.c b/dccp_send.c
index b038fc01c4d18f971ce699d6c78c087c96614039..92dd933347d2c48d857355da34c13673da54968b 100644 (file)
--- a/dccp_send.c
+++ b/dccp_send.c
@@ -225,12 +225,12 @@ void dccp_send_init(struct sender *s)
        s->shutdown_clients = dccp_shutdown_clients;
        s->resolve_target = NULL;
        s->help = generic_sender_help;
-       s->client_cmds[SENDER_ON] = dccp_com_on;
-       s->client_cmds[SENDER_OFF] = dccp_com_off;
-       s->client_cmds[SENDER_DENY] = dccp_com_deny;
-       s->client_cmds[SENDER_ALLOW] = dccp_com_allow;
-       s->client_cmds[SENDER_ADD] = NULL;
-       s->client_cmds[SENDER_DELETE] = NULL;
+       s->client_cmds[SENDER_on] = dccp_com_on;
+       s->client_cmds[SENDER_off] = dccp_com_off;
+       s->client_cmds[SENDER_deny] = dccp_com_deny;
+       s->client_cmds[SENDER_allow] = dccp_com_allow;
+       s->client_cmds[SENDER_add] = NULL;
+       s->client_cmds[SENDER_delete] = NULL;
 
        k = conf.dccp_data_slices_per_group_arg;
        n = conf.dccp_slices_per_group_arg;

diff --git a/http_send.c b/http_send.c
index daf39e73938b6a21b4656c08b5f3367e0e67ceb1..9d0f49aee03cd6b30d6a73e9eda74dcb9be4cfc0 100644 (file)
--- a/http_send.c
+++ b/http_send.c
@@ -256,12 +256,12 @@ void http_send_init(struct sender *s)
        s->shutdown_clients = http_shutdown_clients;
        s->resolve_target = NULL;
        s->help = generic_sender_help;
-       s->client_cmds[SENDER_ON] = http_com_on;
-       s->client_cmds[SENDER_OFF] = http_com_off;
-       s->client_cmds[SENDER_DENY] = http_com_deny;
-       s->client_cmds[SENDER_ALLOW] = http_com_allow;
-       s->client_cmds[SENDER_ADD] = NULL;
-       s->client_cmds[SENDER_DELETE] = NULL;
+       s->client_cmds[SENDER_on] = http_com_on;
+       s->client_cmds[SENDER_off] = http_com_off;
+       s->client_cmds[SENDER_deny] = http_com_deny;
+       s->client_cmds[SENDER_allow] = http_com_allow;
+       s->client_cmds[SENDER_add] = NULL;
+       s->client_cmds[SENDER_delete] = NULL;
 
        init_sender_status(hss, conf.http_access_arg, conf.http_access_given,
                conf.http_port_arg, conf.http_max_clients_arg,

diff --git a/send.h b/send.h
index 09eb78ba5d52f701a09b269b4485913bb05d5f51..0c74f0ea93208ec6b24878c963e671a4da8adb8d 100644 (file)
--- a/send.h
+++ b/send.h
@@ -6,16 +6,21 @@
 
 /** \file send.h Sender-related defines and structures. */
 
-/** The sender subcommands. */
+#define SENDER_SUBCOMMANDS \
+       SENDER_SUBCOMMAND(add) /**< Add a target (udp only). */ \
+       SENDER_SUBCOMMAND(delete) /**< Delete a target (udp only). */ \
+       SENDER_SUBCOMMAND(allow) /**< Allow connections from given IP address(es). */ \
+       SENDER_SUBCOMMAND(deny) /**< Deny connections from given IP address(es). */ \
+       SENDER_SUBCOMMAND(on) /**< Activate the sender. */ \
+       SENDER_SUBCOMMAND(off) /**< Deactivate the sender. */ \
+
+#define SENDER_SUBCOMMAND(_name) SENDER_ ## _name,
 enum sender_subcommand {
-       SENDER_ADD, /**< Add a target (udp only). */
-       SENDER_DELETE, /**< Delete a target (udp only). */
-       SENDER_ALLOW, /**< Allow connections from given IP address(es). */
-       SENDER_DENY, /**< Deny connections from given IP address(es). */
-       SENDER_ON, /**< Activate the sender. */
-       SENDER_OFF, /**< Deactivate the sender. */
+       SENDER_SUBCOMMANDS
        NUM_SENDER_CMDS /**< Used as array size in struct \ref sender. */
 };
+#undef SENDER_SUBCOMMAND
+#define SENDER_SUBCOMMAND(_name) #_name,
 
 /**
  * Describes one supported sender of para_server.

diff --git a/udp_send.c b/udp_send.c
index 3379f98d1dcd2f6b205492f13f4a8bd3e2807ac0..9d9ddfa526faed642c7e375c50ae23356e01edc8 100644 (file)
--- a/udp_send.c
+++ b/udp_send.c
@@ -192,14 +192,14 @@ static int udp_resolve_target(const char *url, struct sender_command_data *scd)
 
 static int udp_com_on(__a_unused struct sender_command_data *scd)
 {
-       sender_status = SENDER_ON;
+       sender_status = SENDER_on;
        return 1;
 }
 
 static int udp_com_off(__a_unused struct sender_command_data *scd)
 {
        udp_shutdown_targets();
-       sender_status = SENDER_OFF;
+       sender_status = SENDER_off;
        return 1;
 }
 
@@ -282,7 +282,7 @@ static void udp_send_fec(struct sender_client *sc, char *buf, size_t len)
 {
        int ret;
 
-       if (sender_status == SENDER_OFF)
+       if (sender_status == SENDER_off)
                return;
        if (len == 0)
                return;
@@ -371,7 +371,7 @@ static char *udp_status(void)
                "status: %s\n"
                "port: %s\n"
                "targets: %s\n",
-               (sender_status == SENDER_ON)? "on" : "off",
+               (sender_status == SENDER_on)? "on" : "off",
                stringify_port(conf.udp_default_port_arg, "udp"),
                tgts? tgts : "(none)"
        );
@@ -430,15 +430,15 @@ void udp_send_init(struct sender *s)
        s->post_select = NULL;
        s->shutdown_clients = udp_shutdown_targets;
        s->resolve_target = udp_resolve_target;
-       s->client_cmds[SENDER_ON] = udp_com_on;
-       s->client_cmds[SENDER_OFF] = udp_com_off;
-       s->client_cmds[SENDER_DENY] = NULL;
-       s->client_cmds[SENDER_ALLOW] = NULL;
-       s->client_cmds[SENDER_ADD] = udp_com_add;
-       s->client_cmds[SENDER_DELETE] = udp_com_delete;
-       sender_status = SENDER_OFF;
+       s->client_cmds[SENDER_on] = udp_com_on;
+       s->client_cmds[SENDER_off] = udp_com_off;
+       s->client_cmds[SENDER_deny] = NULL;
+       s->client_cmds[SENDER_allow] = NULL;
+       s->client_cmds[SENDER_add] = udp_com_add;
+       s->client_cmds[SENDER_delete] = udp_com_delete;
+       sender_status = SENDER_off;
        udp_init_target_list();
        if (!conf.udp_no_autostart_given)
-               sender_status = SENDER_ON;
+               sender_status = SENDER_on;
        PARA_DEBUG_LOG("udp sender init complete\n");
 }