Support building with MSVC

.gitignore

@@ -5,3 +5,4 @@ bareiron.exe
 src/registries.c
 include/registries.h
 *.bin
+obj

README.md

@@ -19,9 +19,10 @@ Before compiling, you'll need to dump registry data from a vanilla Minecraft ser
 
 - To compile on Linux, install `gcc` and run `./build.sh`.
 - For compiling on Windows, there are a few options:
-  - To compile a native Windows binary: install [MSYS2](https://www.msys2.org/) and open the "MSYS2 MINGW64" shell. From there, run `pacman -Sy mingw-w64-x86_64-gcc`, navigate to this project's directory, and run `./build.sh`.
+  - To compile a native Windows binary: install [MSYS2](https://www.msys2.org/) and open the "MSYS2 MINGW64" shell. From there, run `pacman -Sy mingw-w64-x86_64-gcc`, navigate to this project's directory and run `./build.sh`.
   - To compile a native 32-bit binary (compatible with Windows 95/98, but why would you ever want that), use the same steps above, except with `pacman -Sy mingw-w64-cross-gcc` and `./build.sh --9x`.
   - To compile a MSYS2-linked binary: install [MSYS2](https://www.msys2.org/), and open the "MSYS2 MSYS" shell. From there, install `gcc` (run `pacman -Sy gcc`), navigate to this project's directory and run `./build.sh`. 
+  - To compile a MSVC-linked binary: install [MS Visual Studio](https://visualstudio.microsoft.com/vs/older-downloads/) (ensure that you have checked `Desktop development with C++`) and [open Developer Command Prompt for VS](https://learn.microsoft.com/en-us/visualstudio/ide/reference/command-prompt-powershell?view=vs-2022). From there, navigate to this project's directory and run `powershell -File .\build.ps1`.
   - To compile and run a Linux binary from Windows: install WSL, and from there install `gcc` and run `./build.sh` in this project's directory.
 - To target an ESP variant, set up a PlatformIO project (select the ESP-IDF framework, **not Arduino**) and clone this repository on top of it. See **Configuration** below for further steps. For better performance, consider changing the clock speed and enabling compiler optimizations. If you don't know how to do this, there are plenty of resources online.
 

build.ps1

@@ -0,0 +1,11 @@
+if (-not (Test-Path "include\registries.h")) {
+    Write-Error "Error: 'include\registries.h' is missing."
+    Write-Host "Please follow the 'Compilation' section of the README to generate it."
+    exit 1
+}
+
+if (-not (Test-Path "obj")) {
+    New-Item -ItemType Directory -Path "obj" | Out-Null
+}
+
+cl src\*.c /I include /Fe: bareiron.exe /Fo: "obj\\" /O2 /link ws2_32.lib

include/globals.h

@@ -2,7 +2,9 @@
 #define H_GLOBALS
 
 #include <stdint.h>
-#include <unistd.h>
+#ifndef _MSC_VER
+  #include <unistd.h>
+#endif
 
 #ifdef ESP_PLATFORM
   #define WIFI_SSID "your-ssid"
@@ -12,6 +14,11 @@
   #define task_yield();
 #endif
 
+#ifdef _MSC_VER
+  #include <BaseTsd.h>
+  typedef SSIZE_T ssize_t;
+#endif
+
 #define true 1
 #define false 0
 

include/procedures.h

@@ -1,8 +1,6 @@
 #ifndef H_PROCEDURES
 #define H_PROCEDURES
 
-#include <unistd.h>
-
 #include "globals.h"
 
 extern int client_states[MAX_PLAYERS * 2];

include/tools.h

@@ -1,8 +1,6 @@
 #ifndef H_TOOLS
 #define H_TOOLS
 
-#include <unistd.h>
-
 #include "globals.h"
 
 inline int mod_abs (int a, int b) {

src/globals.c

@@ -6,7 +6,6 @@
 #else
   #include <arpa/inet.h>
 #endif
-#include <unistd.h>
 
 #include "globals.h"
 

src/main.c

@@ -27,7 +27,6 @@
     #include <netinet/in.h>
     #include <arpa/inet.h>
   #endif
-  #include <unistd.h>
   #include <time.h>
 #endif
 

src/packets.c

@@ -12,7 +12,6 @@
   #else
     #include <arpa/inet.h>
   #endif
-  #include <unistd.h>
 #endif
 
 #include "globals.h"

src/tools.c

@@ -14,7 +14,6 @@
     #include <sys/socket.h>
     #include <arpa/inet.h>
   #endif
-  #include <unistd.h>
   #include <time.h>
   #ifndef CLOCK_MONOTONIC
     #define CLOCK_MONOTONIC 1
@@ -26,6 +25,7 @@
 #include "procedures.h"
 #include "tools.h"
 
+#ifndef _MSC_VER // MSVC cl: error C2375: 'htonll' : redefinition; different linkage
 #ifndef htonll
   static uint64_t htonll (uint64_t value) {
   #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
@@ -36,6 +36,7 @@
   #endif
   }
 #endif
+#endif
 
 // Keep track of the total amount of bytes received with recv_all
 // Helps notice misread packets and clean up after errors
@@ -238,14 +239,51 @@ uint64_t splitmix64 (uint64_t state) {
   return z ^ (z >> 31);
 }
 
+#ifdef _MSC_VER
+// https://stackoverflow.com/questions/5404277/porting-clock-gettime-to-windows/51974214#51974214
+#define MS_PER_SEC      1000ULL     // MS = milliseconds
+#define US_PER_MS       1000ULL     // US = microseconds
+#define HNS_PER_US      10ULL       // HNS = hundred-nanoseconds (e.g., 1 hns = 100 ns)
+#define NS_PER_US       1000ULL
+
+#define HNS_PER_SEC     (MS_PER_SEC * US_PER_MS * HNS_PER_US)
+#define NS_PER_HNS      (100ULL)    // NS = nanoseconds
+#define NS_PER_SEC      (MS_PER_SEC * US_PER_MS * NS_PER_US)
+
+int clock_gettime_monotonic(struct timespec *tv)
+{
+    static LARGE_INTEGER ticksPerSec;
+    LARGE_INTEGER ticks;
+
+    if (!ticksPerSec.QuadPart) {
+        QueryPerformanceFrequency(&ticksPerSec);
+        if (!ticksPerSec.QuadPart) {
+            errno = ENOTSUP;
+            return -1;
+        }
+    }
+
+    QueryPerformanceCounter(&ticks);
+
+    tv->tv_sec = (long)(ticks.QuadPart / ticksPerSec.QuadPart);
+    tv->tv_nsec = (long)(((ticks.QuadPart % ticksPerSec.QuadPart) * NS_PER_SEC) / ticksPerSec.QuadPart);
+
+    return 0;
+}
+#endif
+
 #ifndef ESP_PLATFORM
 // Returns system time in microseconds.
 // On ESP-IDF, this is available in "esp_timer.h", and returns time *since
 // the start of the program*, and NOT wall clock time. To ensure
 // compatibility, this should only be used to measure time intervals.
 int64_t get_program_time () {
   struct timespec ts;
-  clock_gettime(CLOCK_MONOTONIC, &ts);
+  #ifdef _MSC_VER
+    clock_gettime_monotonic(&ts);
+  #else
+    clock_gettime(CLOCK_MONOTONIC, &ts);
+  #endif
   return (int64_t)ts.tv_sec * 1000000LL + ts.tv_nsec / 1000LL;
 }
 #endif

src/varnum.c

@@ -5,7 +5,6 @@
 #else
   #include <arpa/inet.h>
 #endif
-#include <unistd.h>
 
 #include "varnum.h"
 #include "globals.h"