From b9bf5f0b675a2b1cae0d2fc4e68477d2ec2518ea Mon Sep 17 00:00:00 2001
From: Mitya Selivanov <automainint@guattari.tech>
Date: Sat, 24 Jun 2023 17:06:37 +0200
Subject: Sockets wrapper

---
 README               |  37 +++++++++-------
 TODO                 |   6 ++-
 source/kit/sockets.h | 122 +++++++++++++++++++++++++++++++++++++++++++++++++++
 source/kit/status.h  |   4 +-
 4 files changed, 150 insertions(+), 19 deletions(-)
 create mode 100644 source/kit/sockets.h

diff --git a/README b/README
index f8f40c1..417477b 100644
--- a/README
+++ b/README
@@ -1,24 +1,29 @@
 kit
 
-A collection of C libraries.
+A collection of cross-platform utility libraries.
 
 Features
-- Unit-testing
-- Microbenchmarks
-- Lower bound
-- Move back
-- Dynamic array
-- Input buffer
-- Random number generation
-- Big integer math
-- SHA-256
-- Async function
-- Atomic
-- Condition variable
-- Mutual exclusion
-- Thread
+- Testing
+  - Unit-tests
+  - Microbenchmarks
+- Algorithms and data types
+  - Lower bound
+  - Move back
+  - Dynamic array
+  - Big integer math
+  - SHA-256
+- System
+  - Atomics
+  - Condition variables
+  - Mutual exclusion
+  - Threads
+  - Sockets wrapper
+- Misc
+  - Input buffer
+  - Random number generation
+  - Async functions (coroutines)
 
-Condition variables, mutual exclusions and threads implementation was forked from Mesa source code.
+Condition variables, mutual exclusion and threads implementation was forked from Mesa source code.
 * https://gitlab.freedesktop.org/mesa/mesa
 
 Folder "/include" contains header-only version of this library.
diff --git a/TODO b/TODO
index f8545f4..027d794 100644
--- a/TODO
+++ b/TODO
@@ -1,4 +1,5 @@
-# kit To-Do
+To-Do
+
 - Build system
   - Remove CMake scripts
 - Allocators
@@ -9,5 +10,6 @@
   - Terminal
   - File and memory mapping
   - Inter-process transfer
-  - Sockets wrapper
   - SDL boilerplate
+- Add sockets tests
+
diff --git a/source/kit/sockets.h b/source/kit/sockets.h
new file mode 100644
index 0000000..8afcee6
--- /dev/null
+++ b/source/kit/sockets.h
@@ -0,0 +1,122 @@
+#ifndef KIT_SOCKETS_H
+#define KIT_SOCKETS_H
+
+#include "status.h"
+
+#ifndef KIT_DISABLE_SYSTEM_SOCKETS
+#  ifdef __GNUC__
+#    pragma GCC diagnostic push
+#    pragma GCC diagnostic ignored "-Wunused-function"
+#    pragma GCC diagnostic ignored "-Wunknown-pragmas"
+#  endif
+
+#  if defined(_WIN32) && !defined(__CYGWIN__)
+
+#    define WIN32_LEAN_AND_MEAN
+#    include <winsock2.h>
+#    include <ws2tcpip.h>
+
+#    define socket_t SOCKET
+#    define socklen_t int
+
+//#    define EINPROGRESS WSAEINPROGRESS
+//#    define EWOULDBLOCK WSAEWOULDBLOCK
+//#    define EMSGSIZE WSAEMSGSIZE
+//#    define EISCONN WSAEISCONN
+//#    define ECONNRESET WSAECONNRESET
+//#    define EADDRINUSE WSAEADDRINUSE
+
+//#    define errno ((int) WSAGetLastError())
+
+#    ifdef __cplusplus
+extern "C" {
+#    endif
+
+static kit_status_t kit_sockets_init(void) {
+  WSADATA data;
+  memset(&data, 0, sizeof data);
+  WORD version = MAKEWORD(2, 2);
+  return WSAStartup(version, &data) == ERROR_SUCCESS
+             ? KIT_OK
+             : KIT_ERROR_SOCKETS_STARTUP_FAILED;
+}
+
+static kit_status_t kit_sockets_cleanup(void) {
+  WSACleanup();
+  return KIT_OK;
+}
+
+static int kit_socket_set_blocking(socket_t s) {
+  u_long flag = 0;
+  return ioctlsocket(s, FIONBIO, &flag) == 0
+             ? KIT_OK
+             : KIT_ERROR_SOCKET_CONTROL_FAILED;
+}
+
+static int kit_socket_set_nonblocking(socket_t s) {
+  u_long flag = 1;
+  return ioctlsocket(s, FIONBIO, &flag) == 0
+             ? KIT_OK
+             : KIT_ERROR_SOCKET_CONTROL_FAILED;
+}
+
+#    ifdef __cplusplus
+}
+#    endif
+
+#  else
+
+#    include <arpa/inet.h>
+#    include <errno.h>
+#    include <fcntl.h>
+#    include <netinet/in.h>
+#    include <signal.h>
+#    include <sys/ioctl.h>
+#    include <sys/select.h>
+#    include <sys/socket.h>
+#    include <sys/types.h>
+#    include <unistd.h>
+
+#    define socket_t int
+#    define closesocket close
+#    define INVALID_SOCKET -1
+
+#    ifdef __cplusplus
+extern "C" {
+#    endif
+
+static kit_status_t kit_sockets_init(void) {
+  signal(SIGPIPE, SIG_IGN);
+  return KIT_OK;
+}
+
+static kit_status_t kit_sockets_cleanup(void) {
+  return KIT_OK;
+}
+
+static int kit_socket_set_blocking(socket_t s) {
+  int const flags = fcntl(s, F_GETFL, 0);
+  return fcntl(s, F_SETFL, flags & ~O_NONBLOCK) == 0
+             ? KIT_OK
+             : KIT_ERROR_SOCKET_CONTROL_FAILED;
+}
+
+static int kit_socket_set_nonblocking(socket_t s) {
+  int const flags = fcntl(s, F_GETFL, 0);
+  return fcntl(s, F_SETFL, flags | O_NONBLOCK) == 0
+             ? KIT_OK
+             : KIT_ERROR_SOCKET_CONTROL_FAILED;
+}
+
+#    ifdef __cplusplus
+}
+#    endif
+
+#  endif
+
+#  ifdef __GNUC__
+#    pragma GCC diagnostic pop
+#  endif
+#endif
+
+#endif
diff --git a/source/kit/status.h b/source/kit/status.h
index 3b27a91..0e23151 100644
--- a/source/kit/status.h
+++ b/source/kit/status.h
@@ -13,7 +13,9 @@ enum {
   KIT_ERROR_UNLINK_FAILED,
   KIT_ERROR_FILE_ALREADY_EXISTS,
   KIT_ERROR_FILE_DO_NOT_EXIST,
-  KIT_ERROR_PATH_TOO_LONG
+  KIT_ERROR_PATH_TOO_LONG,
+  KIT_ERROR_SOCKETS_STARTUP_FAILED,
+  KIT_ERROR_SOCKET_CONTROL_FAILED
 };
 
 typedef int kit_status_t;
-- 
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