complete rewrite

engine/net/.clang-format

@@ -0,0 +1,20 @@
+---
+Language: Cpp
+UseTab: Always
+TabWidth: 8
+AlignConsecutiveAssignments:
+  Enabled: true
+AlignConsecutiveDeclarations:
+  Enabled: true
+IndentWidth: 8
+PointerAlignment: Left
+ColumnLimit: 0
+AllowShortIfStatementsOnASingleLine: Always
+AllowShortBlocksOnASingleLine: Never
+AllowShortFunctionsOnASingleLine: Empty
+AllowShortLoopsOnASingleLine: true
+SpaceBeforeParens: Never
+AlignEscapedNewlines: DontAlign
+SortIncludes: false
+AllowShortEnumsOnASingleLine: false
+#IndentPPDirectives: AfterHash

engine/net/CMakeLists.txt

@@ -0,0 +1,21 @@
+cmake_minimum_required(VERSION 3.11)
+project(libfishsoup)
+
+add_library(fishsoup SHARED src/client.c src/server.c src/socket.c src/stb_ds.c)
+
+target_include_directories(fishsoup PUBLIC include)
+
+find_package(PkgConfig)
+pkg_check_modules(ZLIB REQUIRED zlib)
+target_compile_options(fishsoup PRIVATE ${ZLIB_CFLAGS_OTHER})
+target_include_directories(fishsoup PRIVATE ${ZLIB_INCLUDE_DIRS})
+target_link_options(fishsoup PRIVATE ${ZLIB_LDFLAGS_OTHER})
+target_link_directories(fishsoup PRIVATE ${ZLIB_LIBRARY_DIRS})
+target_link_libraries(fishsoup PRIVATE ${ZLIB_LIBRARIES})
+
+include(GNUInstallDirs)
+install(
+	TARGETS fishsoup
+	LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+	ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+)

engine/net/LICENSE

@@ -0,0 +1,24 @@
+Copyright (c) 2025, Fishsoup
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+* Redistributions of source code must retain the above copyright notice, 
+  this list of conditions and the following disclaimer.
+* Redistributions in binary form must reproduce the above copyright notice, 
+  this list of conditions and the following disclaimer in the documentation 
+  and/or other materials provided with the distribution.
+* Neither the name of the <organization> nor the names of its contributors 
+  may be used to endorse or promote products derived from this software 
+  without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

engine/net/Makefile

@@ -0,0 +1,33 @@
+CC = cc
+CFLAGS = -g -Iinclude -fPIC `pkg-config --cflags zlib`
+LDFLAGS = -shared
+LIBS = `pkg-config --libs zlib`
+
+OBJS = src/client.o src/server.o src/socket.o src/stb_ds.o
+
+LIB = lib
+
+SO = .so
+
+.PHONY: all format clean
+.SUFFIXES: .c .o
+
+all: $(LIB)fishsoup$(SO)
+
+format:
+	clang-format --verbose -i `find src include "(" -name "*.c" -or -name "*.h" ")" -and -not -name "stb_*.h"` test*.c
+
+$(LIB)fishsoup$(SO): $(OBJS)
+	$(CC) $(LDFLAGS) -o $@ $(OBJS) $(LIBS)
+
+testclient: testclient.c $(LIB)fishsoup$(SO)
+	cc -o $@ testclient.c -Wl,-R./ -L./ -Iinclude -lfishsoup
+
+testserver: testserver.c $(LIB)fishsoup$(SO)
+	cc -o $@ testserver.c -Wl,-R./ -L./ -Iinclude -lfishsoup
+
+.c.o:
+	$(CC) $(CFLAGS) -c -o $@ $<
+
+clean:
+	rm -f *$(SO) $(OBJS) ./testserver ./testclient

engine/net/include/fishsoup.h

@@ -0,0 +1,86 @@
+#ifndef __FISHSOUP_H__
+#define __FISHSOUP_H__
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <time.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <netinet/tcp.h>
+#include <poll.h>
+
+/* TCP */
+#define FISHSOUP_PORT 3219
+
+#define FISHSOUP_PING 3
+
+enum fishsoup_packet_type {
+	FISHSOUP_PACKET_PING = 0,
+	FISHSOUP_PACKET_PONG,
+	FISHSOUP_PACKET_USER
+};
+
+typedef struct fishsoup_client	      fishsoup_client_t;
+typedef struct fishsoup_server	      fishsoup_server_t;
+typedef struct fishsoup_packet_header fishsoup_packet_header_t;
+typedef struct fishsoup_packet	      fishsoup_packet_t;
+
+struct fishsoup_client {
+	int    fd;
+	time_t last_ping;
+	void (*on_packet)(fishsoup_client_t* client, fishsoup_packet_t* packet);
+	void (*on_disconnect)(fishsoup_client_t* client);
+	void* user;
+	struct {
+		int sent_ping;
+		int cleanup;
+	} server;
+};
+
+struct fishsoup_server {
+	int		   fd;
+	struct sockaddr_in address;
+	fishsoup_client_t* clients;
+	void*		   user;
+	void (*on_client)(fishsoup_server_t* server, fishsoup_client_t* client);
+	void (*on_tick)(fishsoup_server_t* server);
+};
+
+#pragma pack(1)
+struct fishsoup_packet_header {
+	unsigned char  type;
+	unsigned short length; /* ok, seriously, who sends 64k at ONCE */
+};
+#pragma pack()
+
+/* !!! REMEMBER TO FREE DATA AFTER RECV UNLESS IT'S NULL !!! */
+struct fishsoup_packet {
+	fishsoup_packet_header_t header;
+	void*			 data;
+};
+
+fishsoup_client_t* fishsoup_client(const char* host, int port);
+void		   fishsoup_client_on_packet(fishsoup_client_t* client, void (*on_packet)(fishsoup_client_t* client, fishsoup_packet_t* packet));
+void		   fishsoup_client_on_disconnect(fishsoup_client_t* client, void (*on_disconnect)(fishsoup_client_t* client));
+int		   fishsoup_client_poll(fishsoup_client_t* client);
+void		   fishsoup_client_destroy(fishsoup_client_t* client);
+
+fishsoup_server_t* fishsoup_server(int port);
+int		   fishsoup_server_clients(fishsoup_server_t* server);
+void		   fishsoup_server_loop(fishsoup_server_t* server);
+void		   fishsoup_server_on_client(fishsoup_server_t* server, void (*on_client)(fishsoup_server_t* server, fishsoup_client_t* client));
+void		   fishsoup_server_on_tick(fishsoup_server_t* server, void (*on_tick)(fishsoup_server_t* server));
+void		   fishsoup_server_broadcast(fishsoup_server_t* server, fishsoup_packet_t* packet);
+void		   fishsoup_server_destroy(fishsoup_server_t* server);
+
+int fishsoup_fd_send(int fd, const void* buf, int length);
+int fishsoup_fd_recv(int fd, void* buf, int length, int to);
+int fishsoup_packet_send(int fd, fishsoup_packet_t* packet);
+int fishsoup_packet_recv(int fd, fishsoup_packet_t* packet);
+
+#endif

engine/net/src/client.c

@@ -0,0 +1,93 @@
+#include <fishsoup.h>
+
+fishsoup_client_t* fishsoup_client(const char* host, int port) {
+	fishsoup_client_t* client = malloc(sizeof(*client));
+	struct addrinfo	   hints;
+	char		   p[32];
+	struct addrinfo*   result;
+	struct addrinfo*   rp;
+
+	if(port == 0) port = FISHSOUP_PORT;
+	sprintf(p, "%d", port);
+
+	memset(&hints, 0, sizeof(hints));
+	hints.ai_family	  = AF_UNSPEC;
+	hints.ai_socktype = SOCK_STREAM;
+	if(getaddrinfo(host, p, &hints, &result) != 0) {
+		free(client);
+		return NULL;
+	}
+
+	for(rp = result; rp != NULL; rp = rp->ai_next) {
+		int val = 1;
+
+		if((client->fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol)) < 0) {
+			continue;
+		}
+
+		val = 1;
+		setsockopt(client->fd, IPPROTO_TCP, TCP_NODELAY, (char*)&val, sizeof(val));
+
+		if(connect(client->fd, rp->ai_addr, rp->ai_addrlen) >= 0) {
+			break;
+		}
+
+		close(client->fd);
+	}
+
+	if(rp == NULL) {
+		free(client);
+		return NULL;
+	}
+
+	client->on_packet     = NULL;
+	client->on_disconnect = NULL;
+
+	return client;
+}
+
+void fishsoup_client_on_packet(fishsoup_client_t* client, void (*on_packet)(fishsoup_client_t* client, fishsoup_packet_t* packet)) {
+	client->on_packet = on_packet;
+}
+
+void fishsoup_client_on_disconnect(fishsoup_client_t* client, void (*on_disconnect)(fishsoup_client_t* client)) {
+	client->on_disconnect = on_disconnect;
+}
+
+int fishsoup_client_poll(fishsoup_client_t* client) {
+	struct pollfd	  pfd;
+	fishsoup_packet_t pkt;
+	int		  ret;
+
+	pfd.fd	   = client->fd;
+	pfd.events = POLLIN | POLLPRI;
+	ret	   = poll(&pfd, 1, 0);
+	if(ret <= 0) return ret;
+
+	ret = fishsoup_packet_recv(client->fd, &pkt);
+	if(ret == 0) return -1; /* connection broke, probably */
+
+	if(pkt.header.type == FISHSOUP_PACKET_PING) {
+		fishsoup_packet_t ret;
+		client->last_ping = time(NULL);
+
+		ret.header.type	  = FISHSOUP_PACKET_PONG;
+		ret.header.length = 0;
+		ret.data	  = NULL;
+		if(fishsoup_packet_send(client->fd, &ret) == 0) {
+			if(pkt.data != NULL) free(pkt.data);
+			return -1;
+		}
+	}
+	if(client->on_packet != NULL) client->on_packet(client, &pkt);
+
+	if(pkt.data != NULL) free(pkt.data);
+
+	return 1;
+}
+
+void fishsoup_client_destroy(fishsoup_client_t* client) {
+	if(client->on_disconnect != NULL) client->on_disconnect(client);
+	close(client->fd);
+	free(client);
+}

engine/net/src/server.c

@@ -0,0 +1,199 @@
+#include <fishsoup.h>
+
+#include "stb_ds.h"
+
+fishsoup_server_t* fishsoup_server(int port) {
+	fishsoup_server_t* server = malloc(sizeof(*server));
+	int		   val;
+
+	if(port == 0) port = FISHSOUP_PORT;
+
+	if((server->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
+		free(server);
+		return NULL;
+	}
+
+	val = 1;
+	setsockopt(server->fd, IPPROTO_TCP, TCP_NODELAY, (char*)&val, sizeof(val));
+
+	server->address.sin_family	= AF_INET;
+	server->address.sin_addr.s_addr = INADDR_ANY;
+	server->address.sin_port	= htons(port);
+
+	if(bind(server->fd, (struct sockaddr*)&server->address, sizeof(server->address)) < 0) {
+		close(server->fd);
+		free(server);
+		return NULL;
+	}
+
+	if(listen(server->fd, 128) < 0) {
+		close(server->fd);
+		free(server);
+		return NULL;
+	}
+
+	server->clients	  = NULL;
+	server->on_client = NULL;
+	server->on_tick	  = NULL;
+
+	return server;
+}
+
+int fishsoup_server_clients(fishsoup_server_t* server) {
+	return arrlen(server->clients);
+}
+
+void fishsoup_server_loop(fishsoup_server_t* server) {
+	struct pollfd* pfd;
+
+	while(1) {
+		int i;
+		int ret;
+		pfd = malloc(sizeof(*pfd) * (1 + arrlen(server->clients)));
+
+		pfd[0].fd     = server->fd;
+		pfd[0].events = POLLIN | POLLPRI;
+
+		for(i = 0; i < arrlen(server->clients); i++) {
+			pfd[1 + i].fd	  = server->clients[i].fd;
+			pfd[1 + i].events = POLLIN | POLLPRI;
+		}
+
+		ret = poll(pfd, 1 + arrlen(server->clients), 50);
+		if(ret < 0) {
+			free(pfd);
+			break;
+		}
+
+		if(server->on_tick != NULL) server->on_tick(server);
+
+		if(pfd[0].revents & POLLIN) {
+			fishsoup_client_t  client;
+			struct sockaddr_in address;
+			int		   len = sizeof(address);
+
+			client.fd		= accept(server->fd, (struct sockaddr*)&address, &len);
+			client.last_ping	= time(NULL);
+			client.server.cleanup	= 0;
+			client.server.sent_ping = 0;
+			client.on_packet	= NULL;
+
+			arrput(server->clients, client);
+
+			if(server->on_client != NULL) server->on_client(server, &server->clients[arrlen(server->clients) - 1]);
+
+#ifdef DEBUG
+			fprintf(stderr, "Client %d accepted\n", server->clients[i].fd);
+#endif
+		}
+
+		for(i = 0; i < arrlen(server->clients); i++) {
+			time_t diff;
+			if(server->clients[i].server.cleanup) continue;
+			if(pfd[1 + i].revents & POLLIN) {
+				fishsoup_packet_t pkt;
+
+				if(fishsoup_packet_recv(server->clients[i].fd, &pkt) == 0) {
+					server->clients[i].server.cleanup = 1;
+				} else {
+					if(pkt.header.type == FISHSOUP_PACKET_PONG && server->clients[i].server.sent_ping) {
+						server->clients[i].last_ping	    = time(NULL);
+						server->clients[i].server.sent_ping = 0;
+
+#ifdef DEBUG
+						fprintf(stderr, "Pong from client %d\n", server->clients[i].fd);
+#endif
+					} else if(pkt.header.type == FISHSOUP_PACKET_PING) {
+						fishsoup_packet_t ret;
+
+						ret.header.type	  = FISHSOUP_PACKET_PONG;
+						ret.header.length = 0;
+						ret.data	  = NULL;
+
+						if(fishsoup_packet_send(server->clients[i].fd, &ret) == 0) {
+							server->clients[i].server.cleanup = 1;
+						} else {
+#ifdef DEBUG
+							fprintf(stderr, "Ping from client %d, sending back pong\n", server->clients[i].fd);
+#endif
+						}
+					}
+
+					if(!server->clients[i].server.cleanup && server->clients[i].on_packet != NULL) server->clients[i].on_packet(&server->clients[i], &pkt);
+
+					if(pkt.data != NULL) free(pkt.data);
+				}
+			}
+			if(server->clients[i].server.cleanup) continue;
+
+			diff = time(NULL) - server->clients[i].last_ping;
+
+			if(diff == FISHSOUP_PING && !server->clients[i].server.sent_ping) {
+				fishsoup_packet_t pkt;
+
+				pkt.header.type	  = FISHSOUP_PACKET_PING;
+				pkt.header.length = 0;
+				pkt.data	  = NULL;
+
+				if(fishsoup_packet_send(server->clients[i].fd, &pkt) == 0) {
+					server->clients[i].server.cleanup = 1;
+#ifdef DEBUG
+					fprintf(stderr, "Failed to ping client %d\n", server->clients[i].fd);
+#endif
+				} else {
+					server->clients[i].server.sent_ping = 1;
+#ifdef DEBUG
+					fprintf(stderr, "Pinging client %d\n", server->clients[i].fd);
+#endif
+				}
+			} else if(diff == FISHSOUP_PING * 2 && server->clients[i].server.sent_ping) {
+				server->clients[i].server.cleanup = 1;
+#ifdef DEBUG
+				fprintf(stderr, "Ping timeout (client %d)\n", server->clients[i].fd);
+#endif
+			}
+		}
+
+		for(i = 0; i < arrlen(server->clients); i++) {
+			if(server->clients[i].server.cleanup) {
+#ifdef DEBUG
+				fprintf(stderr, "Client %d cleanup\n", server->clients[i].fd);
+#endif
+				if(server->clients[i].on_disconnect != NULL) server->clients[i].on_disconnect(&server->clients[i]);
+				close(server->clients[i].fd);
+				arrdel(server->clients, i);
+				i--;
+			}
+		}
+
+		free(pfd);
+	}
+}
+
+void fishsoup_server_on_client(fishsoup_server_t* server, void (*on_client)(fishsoup_server_t* server, fishsoup_client_t* client)) {
+	server->on_client = on_client;
+}
+
+void fishsoup_server_on_tick(fishsoup_server_t* server, void (*on_tick)(fishsoup_server_t* server)) {
+	server->on_tick = on_tick;
+}
+
+void fishsoup_server_destroy(fishsoup_server_t* server) {
+	int i;
+	for(i = 0; i < arrlen(server->clients); i++) {
+		if(server->clients[i].on_disconnect != NULL) server->clients[i].on_disconnect(&server->clients[i]);
+		close(server->clients[i].fd);
+	}
+	arrfree(server->clients);
+	close(server->fd);
+	free(server);
+}
+
+void fishsoup_server_broadcast(fishsoup_server_t* server, fishsoup_packet_t* packet) {
+	int i;
+	for(i = 0; i < arrlen(server->clients); i++) {
+		if(fishsoup_packet_send(server->clients[i].fd, packet) == 0) {
+			server->clients[i].server.cleanup = 1;
+		}
+	}
+}

engine/net/src/socket.c

@@ -0,0 +1,200 @@
+#include <fishsoup.h>
+
+#include <zlib.h>
+
+#define CHUNK 512
+
+int fishsoup_packet_send(int fd, fishsoup_packet_t* packet) {
+	int			 r;
+	fishsoup_packet_header_t h;
+	int			 len  = 0;
+	unsigned char*		 data = NULL;
+
+	if(packet->header.length > 0) {
+		z_stream      strm;
+		int	      in    = packet->header.length;
+		int	      seek  = 0;
+		int	      flush = 0;
+		unsigned char buf[CHUNK];
+
+		strm.zalloc = Z_NULL;
+		strm.zfree  = Z_NULL;
+		strm.opaque = Z_NULL;
+		if(deflateInit(&strm, Z_DEFAULT_COMPRESSION) != Z_OK) return 0;
+
+		do {
+			strm.avail_in = in <= CHUNK ? in : CHUNK;
+			strm.next_in  = ((unsigned char*)packet->data) + seek;
+
+			flush = in <= CHUNK ? Z_FINISH : Z_NO_FLUSH;
+
+			do {
+				int have;
+
+				strm.avail_out = CHUNK;
+				strm.next_out  = buf;
+
+				deflate(&strm, flush);
+
+				have = CHUNK - strm.avail_out;
+
+				if(data == NULL) {
+					data = malloc(have);
+					memcpy(data, buf, have);
+				} else {
+					unsigned char* old = data;
+
+					data = malloc(len + have);
+					memcpy(data, old, len);
+					memcpy(data + len, buf, have);
+
+					free(data);
+				}
+
+				len += have;
+			} while(strm.avail_out == 0);
+
+			seek += CHUNK;
+		} while(flush != Z_FINISH);
+
+		deflateEnd(&strm);
+	}
+
+	memcpy(&h, &packet->header, sizeof(h));
+	h.length = htons(len);
+
+	r = fishsoup_fd_send(fd, &h, sizeof(h));
+	if(r != sizeof(h)) return 0;
+
+	if(data != NULL) {
+		r = fishsoup_fd_send(fd, data, len);
+		if(r != sizeof(h)) {
+			free(data);
+			return 0;
+		}
+		free(data);
+	}
+
+	return sizeof(h) + len;
+}
+
+int fishsoup_packet_recv(int fd, fishsoup_packet_t* packet) {
+	fishsoup_packet_header_t h;
+
+	if(fishsoup_fd_recv(fd, &h, sizeof(h), 500) != sizeof(h)) {
+		packet->data = NULL;
+		return 0;
+	}
+
+	memcpy(&packet->header, &h, sizeof(h));
+	packet->header.length = ntohs(packet->header.length);
+	packet->data	      = NULL;
+	if(packet->header.length > 0) {
+		unsigned char* data = malloc(packet->header.length);
+		z_stream       strm;
+		int	       in = packet->header.length;
+		int	       ret;
+		int	       seek = 0;
+		int	       len  = 0;
+		unsigned char  buf[CHUNK];
+		if(fishsoup_fd_recv(fd, data, packet->header.length, 50) != packet->header.length) {
+			free(data);
+			return 0;
+		}
+
+		strm.zalloc   = Z_NULL;
+		strm.zfree    = Z_NULL;
+		strm.opaque   = Z_NULL;
+		strm.avail_in = 0;
+		strm.next_in  = Z_NULL;
+
+		if(inflateInit(&strm) != Z_OK) {
+			free(data);
+			return 0;
+		}
+
+		do {
+			strm.avail_in = in <= CHUNK ? in : CHUNK;
+			strm.next_in  = data + seek;
+
+			do {
+				int have;
+
+				strm.avail_out = CHUNK;
+				strm.next_out  = buf;
+
+				ret = inflate(&strm, Z_NO_FLUSH);
+
+				if(ret == Z_NEED_DICT || ret == Z_DATA_ERROR || ret == Z_MEM_ERROR) {
+					inflateEnd(&strm);
+					if(packet->data != NULL) {
+						free(packet->data);
+						packet->data = NULL;
+					}
+					free(data);
+					return 0;
+				}
+
+				have = CHUNK - strm.avail_out;
+
+				if(packet->data == NULL) {
+					packet->data = malloc(have);
+					memcpy(packet->data, buf, have);
+				} else {
+					unsigned char* old = packet->data;
+
+					packet->data = malloc(len + have);
+					memcpy(packet->data, old, len);
+					memcpy(packet->data + len, buf, have);
+
+					free(packet->data);
+				}
+
+				len += have;
+			} while(strm.avail_out == 0);
+		} while(ret != Z_STREAM_END);
+
+		inflateEnd(&strm);
+
+		free(data);
+
+		packet->header.length = len;
+	}
+
+	return sizeof(h) + packet->header.length;
+}
+
+int fishsoup_fd_send(int fd, const void* buf, int length) {
+	struct pollfd pfd;
+	pfd.fd	   = fd;
+	pfd.events = POLLOUT | POLLPRI;
+
+	poll(&pfd, 1, 0);
+	if(!(pfd.revents & POLLOUT)) return 0;
+
+	return send(fd, buf, length, 0);
+}
+
+int fishsoup_fd_recv(int fd, void* buf, int length, int to) {
+	struct pollfd  pfd;
+	int	       ret;
+	unsigned char* b = buf;
+	int	       i = 0;
+	time_t	       t = time(NULL);
+
+	pfd.fd	   = fd;
+	pfd.events = POLLIN | POLLPRI;
+
+	while(i < length) {
+		/* i think 500 is reasonable timeout. no? */
+		ret = poll(&pfd, 1, to);
+
+		if((time(NULL) - t) >= 5) return i; /* we waited enough! kill the connection */
+		if(ret <= 0) return i;
+
+		ret = recv(fd, &b[i], 1, 0);
+		if(ret < 1) return i;
+		i++;
+	}
+	return i;
+}

engine/net/src/stb_ds.c

@@ -0,0 +1,2 @@
+#define STB_DS_IMPLEMENTATION
+#include "stb_ds.h"

engine/net/testclient.c

@@ -0,0 +1,11 @@
+#include <fishsoup.h>
+
+void on(fishsoup_client_t* client, fishsoup_packet_t* pkt) {
+	if(pkt->header.type == FISHSOUP_PACKET_USER) printf("Received: %s\n", pkt->data);
+}
+
+int main() {
+	fishsoup_client_t* client = fishsoup_client("127.0.0.1", 0);
+	fishsoup_client_on_packet(client, on);
+	while(fishsoup_client_poll(client) >= 0);
+}

engine/net/testserver.c

@@ -0,0 +1,18 @@
+#include <fishsoup.h>
+
+void on(fishsoup_server_t* server, fishsoup_client_t* client) {
+	fishsoup_packet_t pkt;
+
+	pkt.data	  = "Hello world!";
+	pkt.header.length = strlen(pkt.data) + 1;
+	pkt.header.flag	  = 0;
+	pkt.header.type	  = FISHSOUP_PACKET_USER;
+
+	fishsoup_packet_send(client->fd, &pkt);
+}
+
+int main() {
+	fishsoup_server_t* server = fishsoup_server(0);
+	fishsoup_server_on_client(server, on);
+	fishsoup_server_loop(server);
+}