feat(os): implement OsGetExePath, OsGetExeName

bc/os/Path.cpp

@@ -0,0 +1,57 @@
+#include "bc/os/Path.hpp"
+#include "bc/String.hpp"
+#include "bc/file/Path.hpp"
+
+#if defined(WHOA_SYSTEM_WIN)
+#include <windows.h>
+#endif
+
+#if defined(WHOA_SYSTEM_MAC)
+#include <mach-o/dyld.h>
+#endif
+
+// Get the full path of the currently running .exe/ELF/Mach-O executable
+void OsGetExeName(char* buffer, size_t chars) {
+#if defined(WHOA_SYSTEM_WIN)
+    // Win32
+    GetModuleFileName(nullptr, buffer, chars);
+#endif
+
+#if defined(WHOA_SYSTEM_MAC)
+    // Darwin
+    char path[1024] = {0};
+    _NSGetExecutablePath(path, 1024);
+
+    char actualPath[1024] = {0};
+    realpath(path, actualPath);
+
+    Blizzard::File::Path::MakeBackslashPath(actualPath, buffer, chars);
+#endif
+
+#if defined(WHOA_SYSTEM_LINUX)
+    // procfs
+    char actualPath[4096] = {0};
+    readlink("/proc/self/exe", actualPath, chars);
+    Blizzard::File::Path::MakeBackslashPath(actualPath, buffer, chars);
+#endif
+}
+
+void OsPathStripFilename(char* path) {
+    auto length = String::Length(path);
+
+    char* head  = &path[length-1];
+
+    while ((head != (path-1)) && (*head != '\0')) {
+        if (*head == '\\') {
+            *(head + 1) = '\0';
+            break;
+        }
+        head--;
+    }
+}
+
+// Get the directory containing the currently running executable
+void OsGetExePath(char* dest, size_t chars) {
+    OsGetExeName(dest, chars);
+    OsPathStripFilename(dest);
+}

bc/os/Path.hpp

@@ -0,0 +1,8 @@
+#ifndef BC_OS_PATH_HPP
+#define BC_OS_PATH_HPP
+
+void OsGetExePath(char* buffer, size_t chars);
+
+void OsGetExeName(char* buffer, size_t chars);
+
+#endif