Everything needed to run simple Rust programs (#40)

* Everything needed to run simple Rust programs

* Add IsDBCSLeadByte implementation

* Address PR comments

dll/crt.cpp

@@ -0,0 +1,140 @@
+#include "common.h"
+
+typedef void (*_PVFV)();
+typedef int (*_PIFV)();
+
+typedef enum _crt_app_type {
+	_crt_unknown_app,
+	_crt_console_app,
+	_crt_gui_app,
+} _crt_app_type;
+
+typedef enum _crt_argv_mode {
+	_crt_argv_no_arguments,
+	_crt_argv_unexpanded_arguments,
+	_crt_argv_expanded_arguments,
+} _crt_argv_mode;
+
+namespace crt {
+
+int _commode = 0;
+
+void WIN_ENTRY _initterm(const _PVFV *ppfn, const _PVFV *end) {
+	do {
+		if (_PVFV pfn = *++ppfn) {
+			pfn();
+		}
+	} while (ppfn < end);
+}
+
+int WIN_ENTRY _initterm_e(const _PIFV *ppfn, const _PIFV *end) {
+	do {
+		if (_PIFV pfn = *++ppfn) {
+			if (int err = pfn())
+				return err;
+		}
+	} while (ppfn < end);
+
+	return 0;
+}
+
+void WIN_ENTRY _set_app_type(_crt_app_type type) { DEBUG_LOG("STUB: _set_app_type(%i)\n", type); }
+
+int WIN_ENTRY _set_fmode(int mode) {
+	DEBUG_LOG("STUB: _set_fmode(%i)\n", mode);
+	return 0;
+}
+
+int *WIN_ENTRY __p__commode() { return &_commode; }
+
+int WIN_ENTRY _crt_atexit(void (*func)()) {
+	DEBUG_LOG("STUB: _crt_atexit(%p)\n", func);
+	return 0;
+}
+
+int WIN_ENTRY _configure_narrow_argv(_crt_argv_mode mode) {
+	DEBUG_LOG("STUB: _configure_narrow_argv(%i)\n", mode);
+	return 0;
+}
+
+int WIN_ENTRY _controlfp_s(unsigned int *currentControl, unsigned int newControl, unsigned int mask) {
+	DEBUG_LOG("STUB: _controlfp_s(%p, %u, %u)\n", currentControl, newControl, mask);
+	return 0;
+}
+
+int WIN_ENTRY _configthreadlocale(int per_thread_locale_type) {
+	DEBUG_LOG("STUB: _configthreadlocale(%i)\n", per_thread_locale_type);
+	return 0;
+}
+
+int WIN_ENTRY _initialize_narrow_environment() {
+	DEBUG_LOG("STUB: _initialize_narrow_environment()\n");
+	return 0;
+}
+
+int WIN_ENTRY _set_new_mode(int newhandlermode) {
+	DEBUG_LOG("STUB: _set_new_mode(%i)\n", newhandlermode);
+	return 0;
+}
+
+char **WIN_ENTRY _get_initial_narrow_environment() { return environ; }
+
+char ***WIN_ENTRY __p___argv() { return &wibo::argv; }
+
+int *WIN_ENTRY __p___argc() { return &wibo::argc; }
+
+size_t WIN_ENTRY strlen(const char *str) { return ::strlen(str); }
+
+} // namespace crt
+
+static void *resolveByName(const char *name) {
+	if (strcmp(name, "_initterm") == 0)
+		return (void *)crt::_initterm;
+	if (strcmp(name, "_initterm_e") == 0)
+		return (void *)crt::_initterm_e;
+	if (strcmp(name, "_set_app_type") == 0)
+		return (void *)crt::_set_app_type;
+	if (strcmp(name, "_set_fmode") == 0)
+		return (void *)crt::_set_fmode;
+	if (strcmp(name, "__p__commode") == 0)
+		return (void *)crt::__p__commode;
+	if (strcmp(name, "_crt_atexit") == 0)
+		return (void *)crt::_crt_atexit;
+	if (strcmp(name, "_configure_narrow_argv") == 0)
+		return (void *)crt::_configure_narrow_argv;
+	if (strcmp(name, "_controlfp_s") == 0)
+		return (void *)crt::_controlfp_s;
+	if (strcmp(name, "_configthreadlocale") == 0)
+		return (void *)crt::_configthreadlocale;
+	if (strcmp(name, "_initialize_narrow_environment") == 0)
+		return (void *)crt::_initialize_narrow_environment;
+	if (strcmp(name, "_set_new_mode") == 0)
+		return (void *)crt::_set_new_mode;
+	if (strcmp(name, "_get_initial_narrow_environment") == 0)
+		return (void *)crt::_get_initial_narrow_environment;
+	if (strcmp(name, "__p___argv") == 0)
+		return (void *)crt::__p___argv;
+	if (strcmp(name, "__p___argc") == 0)
+		return (void *)crt::__p___argc;
+	if (strcmp(name, "strlen") == 0)
+		return (void *)crt::strlen;
+	return nullptr;
+}
+
+wibo::Module lib_crt = {
+	(const char *[]){
+		"api-ms-win-crt-heap-l1-1-0",
+		"api-ms-win-crt-heap-l1-1-0.dll",
+		"api-ms-win-crt-locale-l1-1-0",
+		"api-ms-win-crt-locale-l1-1-0.dll",
+		"api-ms-win-crt-runtime-l1-1-0",
+		"api-ms-win-crt-runtime-l1-1-0.dll",
+		"api-ms-win-crt-stdio-l1-1-0",
+		"api-ms-win-crt-stdio-l1-1-0.dll",
+		"api-ms-win-crt-string-l1-1-0",
+		"api-ms-win-crt-string-l1-1-0.dll",
+		nullptr,
+	},
+	resolveByName,
+	nullptr,
+};