From 7240505bd1158f6633e4e9dac4af2fe07a27ab11 Mon Sep 17 00:00:00 2001
From: interfiberschool <117294755+interfiberschool@users.noreply.github.com>
Date: Thu, 16 Mar 2023 18:04:29 +0000
Subject: [PATCH] init

---
 .devcontainer/devcontainer.json | 19 +++++++++++++++++
 .gitignore                      |  1 +
 Makefile                        | 17 +++++++++++++++
 README.md                       |  1 -
 examples/unix/lib.c             |  5 +++++
 examples/unix/main.c            |  6 ++++++
 examples/win/lib.c              |  5 +++++
 examples/win/main.c             |  6 ++++++
 src/dlopen.c                    | 32 ++++++++++++++++++++++++++++
 src/dlopen.h                    | 37 +++++++++++++++++++++++++++++++++
 10 files changed, 128 insertions(+), 1 deletion(-)
 create mode 100644 .devcontainer/devcontainer.json
 create mode 100644 .gitignore
 create mode 100644 Makefile
 delete mode 100644 README.md
 create mode 100644 examples/unix/lib.c
 create mode 100644 examples/unix/main.c
 create mode 100644 examples/win/lib.c
 create mode 100644 examples/win/main.c
 create mode 100644 src/dlopen.c
 create mode 100644 src/dlopen.h

diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
new file mode 100644
index 0000000..009a80f
--- /dev/null
+++ b/.devcontainer/devcontainer.json
@@ -0,0 +1,19 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/debian
+{
+	"name": "Debian",
+	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
+	"image": "mcr.microsoft.com/devcontainers/base:bullseye"
+
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	// "features": {},
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+
+	// Configure tool-specific properties.
+	// "customizations": {},
+
+	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "root"
+}
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c5e82d7
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+bin
\ No newline at end of file
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..f631e83
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,17 @@
+exampleUnix: examples/unix/main.c examples/unix/lib.c src/dlopen.c
+	## BUILD UNIX EXAMPLES ##
+
+	mkdir -p bin
+
+	gcc examples/unix/main.c src/dlopen.c -o bin/exampleUnix -ldl
+	gcc examples/unix/lib.c -shared -o bin/exampleUnixLib.dll
+
+exampleWin: examples/win/main.c examples/win/lib.c src/dlopen.c
+	## BUILD WINDOWS EXAMPLES ##
+
+	mkdir -p bin
+
+	x86_64-w64-mingw32-gcc examples/win/main.c src/dlopen.c -o bin/exampleWin
+	x86_64-w64-mingw32-gcc examples/win/lib.c -shared -o bin/exampleWinLib.dll
+
+all: exampleUnix exampleWin
\ No newline at end of file
diff --git a/README.md b/README.md
deleted file mode 100644
index 8b13789..0000000
--- a/README.md
+++ /dev/null
@@ -1 +0,0 @@
-
diff --git a/examples/unix/lib.c b/examples/unix/lib.c
new file mode 100644
index 0000000..e3f6573
--- /dev/null
+++ b/examples/unix/lib.c
@@ -0,0 +1,5 @@
+#include <stdio.h>
+
+void test(){
+    printf("testing 123\n");
+}
\ No newline at end of file
diff --git a/examples/unix/main.c b/examples/unix/main.c
new file mode 100644
index 0000000..d2f98d9
--- /dev/null
+++ b/examples/unix/main.c
@@ -0,0 +1,6 @@
+#include "../../src/dlopen.h"
+
+int main()
+{
+    struct hotwire_dll_t dll = hw_dlopen("./bin/exampleUnixLib.dll", RTLD_NOW);
+}
\ No newline at end of file
diff --git a/examples/win/lib.c b/examples/win/lib.c
new file mode 100644
index 0000000..b03eff9
--- /dev/null
+++ b/examples/win/lib.c
@@ -0,0 +1,5 @@
+#include <stdio.h>
+
+void test(){
+    printf("testing 123(windows)\n");
+}
\ No newline at end of file
diff --git a/examples/win/main.c b/examples/win/main.c
new file mode 100644
index 0000000..d709de1
--- /dev/null
+++ b/examples/win/main.c
@@ -0,0 +1,6 @@
+#include "../../src/dlopen.h"
+
+int main()
+{
+    struct hotwire_dll_t dll = hw_dlopen("./bin/exampleWinLib.dll", 0);
+}
\ No newline at end of file
diff --git a/src/dlopen.c b/src/dlopen.c
new file mode 100644
index 0000000..a22c98e
--- /dev/null
+++ b/src/dlopen.c
@@ -0,0 +1,32 @@
+#include "dlopen.h"
+#include <stdlib.h>
+
+struct hotwire_dll_t hw_dlopen(const char *file, int flags) {
+
+  struct hotwire_dll_t dll;
+
+// UNIX specific code(MacOS uses the same API as linux for dlopen)
+#if defined(__linux__) || defined(__APPLE__)
+  dll.dll_handle = dlopen(file, flags);
+
+  if (dll.dll_handle == NULL){
+    printf("could not load dll(UNIX api call returned error)\n");
+    printf("error message: %s\n", dlerror());
+
+    exit(-1);
+  }
+#endif
+
+// Windows specific code
+#if defined(_WIN32)
+  dll.dll_handle = LoadLibrary(file);
+
+  if (!dll.dll_handle){
+    printf("could not load dll(windows api call returned error)\n");
+    
+    exit(-1);
+  }
+#endif
+
+  return dll;
+}
\ No newline at end of file
diff --git a/src/dlopen.h b/src/dlopen.h
new file mode 100644
index 0000000..0b0fdd5
--- /dev/null
+++ b/src/dlopen.h
@@ -0,0 +1,37 @@
+#pragma once
+#include <stdio.h>
+
+#if defined(__APPLE__)
+#define HW_MODE 0
+#include <dlfcn.h>
+#endif
+
+#if defined(__linux__)
+#define HW_MODE 1
+#include <dlfcn.h>
+#endif
+
+#if defined(_WIN32)
+#define HW_MODE 2
+#include <windows.h>
+#endif
+
+
+struct hotwire_dll_t {
+    #if defined(__linux__) || defined(__APPLE__)
+    void* dll_handle;
+    #endif
+
+    #if defined(_WIN32)
+    HINSTANCE dll_handle;
+    #endif
+};
+
+// Function arguments are based off the dlopen() api on POSIX based operating systems
+// Loads dll from library
+struct hotwire_dll_t hw_dlopen(const char* file, int flags);
+
+// Loads symbol from DLL
+inline void* hw_dlsym(struct hotwire_dll_t dll, const char *__restrict symbol);
+
+inline int hw_dlclose(void* handle);