add convenient functions in wire for getting strings with a limited length

Makefile

@@ -1,5 +1,5 @@
 CC?=gcc
-CFLAGS+=-Wall -Wextra -std=c99 -ggdb -fsanitize=address
+CFLAGS+=-Wall -Wextra -Wshadow -std=c99 -ggdb -fsanitize=address
 
 jitterbug: util.c wire.c match.c server.c main.c
 	$(CC) $(CFLAGS) -o $@ $^

main.c

@@ -27,7 +27,7 @@ int main(int argc, char *argv[])
     /* we handle send() errors directly in the code */
     signal(SIGPIPE, SIG_IGN);
 
-    struct jb_server *srv = jb_server_create(socket_path);
+    bus_t *srv = bus_create(socket_path);
     if (srv == NULL) {
         fprintf(stderr, "server_create failed\n");
         return EXIT_FAILURE;
@@ -36,14 +36,14 @@ int main(int argc, char *argv[])
     printf("Listening on %s\n", socket_path);
 
     while (1) {
-        if (jb_server_turn(srv) < 0) {
+        if (bus_turn(srv) < 0) {
             fprintf(stderr, "server_turn failed (errno=%d, strerror=%s)\n", errno, strerror(errno));
-            jb_server_free(srv);
+            bus_free(srv);
             return EXIT_FAILURE;
         }
     }
 
-    jb_server_free(srv);
+    bus_free(srv);
 
     return EXIT_SUCCESS;
 }

server.h

@@ -2,52 +2,58 @@
 #define _JITTERBUG__SERVER_H
 
 #include "match.h"
+#include "wire.h"
 #include <poll.h>
 #include <stdint.h>
 
 // TODO: dynamically size the arrays
-#define JB_MAX_CLIENTS 256
-#define JB_MAX_NAMES 512
-#define JB_MAX_MATCH 12
-#define JB_BACKLOG 12
+#define BUS_MAX_CLIENTS 256
+#define BUS_MAX_NAMES 512
+#define BUS_MAX_MATCH 12
+#define BUS_BACKLOG 12
 
 enum {
-    JB_CLIENT_STATE_NONE,
-    JB_CLIENT_STATE_WAIT_AUTH,
-    JB_CLIENT_STATE_WAIT_BEGIN,
-    JB_CLIENT_STATE_READY
+    BUS_CLIENT_STATE_NONE,
+    BUS_CLIENT_STATE_WAIT_AUTH,
+    BUS_CLIENT_STATE_WAIT_BEGIN,
+    BUS_CLIENT_STATE_READY
 };
 
-struct jb_client {
+typedef struct bus_client {
     int fd;
     uint8_t state;
     int16_t unique_name_index;
     int16_t owned_name_index;
     int8_t match_count;
-    match_rule_t *matches[JB_MAX_MATCH];
-};
+    match_rule_t *matches[BUS_MAX_MATCH];
+} bus_client_t;
 
-struct jb_name {
+typedef struct bus_name {
     char *name;
     int32_t client_index;
-};
+} bus_name_t;
 
-struct jb_server {
+typedef struct bus {
     int sock_fd;
     int fd_num;
     int names_count;
     int clients_count;
-    struct jb_client clients[JB_MAX_CLIENTS];
-    struct jb_name names[JB_MAX_NAMES];
-    struct pollfd fds[JB_MAX_CLIENTS + 1];
-};
+    bus_client_t clients[BUS_MAX_CLIENTS];
+    bus_name_t names[BUS_MAX_NAMES];
+    struct pollfd fds[BUS_MAX_CLIENTS + 1];
+} bus_t;
+
+typedef struct bus_method_handler {
+    const char *name;
+    int (*handler)(bus_t *bus, int client_index, wire_message_t *msg, wire_context_t *ctx, wire_context_t *reply_ctx);
+} bus_method_handler_t;
 
 
-int jb_server_client_add(struct jb_server *s, int fd);
-void jb_server_client_remove(struct jb_server *s, int i);
-void jb_server_free(struct jb_server *s);
-struct jb_server *jb_server_create(const char *socket_path);
-int jb_server_turn(struct jb_server *s);
+int bus_client_add(bus_t *s, int fd);
+void bus_client_remove(bus_t *s, int i);
+void bus_free(bus_t *s);
+bus_t *bus_create(const char *socket_path);
+int bus_turn(bus_t *s);
 
 
 #endif // _JITTERBUG__SERVER_H

wire.c

@@ -100,6 +100,13 @@ char *wire_set_string_impl(wire_context_t *c, const char *str, bool as_signature
     return dest;
 }
 
+char *wire_get_string_check(wire_context_t *c, int min_length, int max_length) {
+    char *str = TRYPTR_NIL(wire_get_string_impl(c, false));
+    int length = strlen(str);
+    if (length < min_length || length > max_length) return NULL;
+    return str;
+}
+
 int wire_parse_message(wire_context_t *c, wire_message_t *msg)
 {
     // SPEC: https://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-messages

wire.h

@@ -123,6 +123,7 @@ _WIRE_DECL_TYPE(boolean, uint32_t, 4);
 
 char *wire_get_string_impl(wire_context_t *c, bool as_signature);
 char *wire_set_string_impl(wire_context_t *c, const char *str, bool as_signature);
+char *wire_get_string_check(wire_context_t *c, int min_length, int max_length);
 int wire_parse_message(wire_context_t *c, wire_message_t *msg);
 int wire_compose_reply(wire_context_t *c, wire_message_t *msg, const char *signature, uint32_t **out_body_length);
 int wire_compose_error(wire_context_t *c, wire_message_t *msg, const char *error_name);
@@ -145,5 +146,10 @@ static inline char *wire_set_string(wire_context_t *c, const char *str) {
     return wire_set_string_impl(c, str, false);
 }
 
+// maximum name length is 255
+static inline char *wire_get_name_string(wire_context_t *c) {
+    return wire_get_string_check(c, 1, 255);
+}
+
 
 #endif // _JITTERBUG__WIRE_H