fix: use wide-char Windows APIs for non-ASCII filenames

tools/funpack.c

@@ -13,7 +13,7 @@
 #ifdef _WIN32
 #include <direct.h>
 #include <windows.h>
-#define MKDIR(path) _mkdir(path)
+#include <wchar.h>
 #define PROGRAM_NAME "funpack.exe"
 #else
 #include <time.h>
@@ -21,6 +21,42 @@
 #define PROGRAM_NAME "funpack"
 #endif
 
+#ifdef _WIN32
+static wchar_t *utf8_to_wide(const char *s)
+{
+	int wlen = MultiByteToWideChar(CP_UTF8, 0, s, -1, NULL, 0);
+	wchar_t *w;
+
+	if (wlen <= 0)
+		return NULL;
+	w = malloc((size_t)wlen * sizeof(wchar_t));
+	if (!w)
+		return NULL;
+	MultiByteToWideChar(CP_UTF8, 0, s, -1, w, wlen);
+	return w;
+}
+
+static int win_mkdir(const char *path)
+{
+	wchar_t *wpath = utf8_to_wide(path);
+	int ok;
+
+	if (!wpath)
+		return -1;
+	ok = CreateDirectoryW(wpath, NULL);
+	free(wpath);
+	if (ok)
+		return 0;
+	if (GetLastError() == ERROR_ALREADY_EXISTS) {
+		errno = EEXIST;
+		return -1;
+	}
+	errno = 0;
+	return -1;
+}
+#define MKDIR(path) win_mkdir(path)
+#endif
+
 static double now_seconds(void)
 {
 #ifdef _WIN32
@@ -168,6 +204,9 @@ static int extract_entry(const char *out_dir, const fpk_entry_t *entry,
 {
 	char *full_path = join_path(out_dir, entry->path);
 	FILE *fp;
+#ifdef _WIN32
+	wchar_t *wpath;
+#endif
 
 	if (strchr(entry->path, '/') != NULL) {
 		char *dir_part = dup_str(full_path);
@@ -182,7 +221,13 @@ static int extract_entry(const char *out_dir, const fpk_entry_t *entry,
 		free(dir_part);
 	}
 
+#ifdef _WIN32
+	wpath = utf8_to_wide(full_path);
+	fp = wpath ? _wfopen(wpath, L"wb") : NULL;
+	free(wpath);
+#else
 	fp = fopen(full_path, "wb");
+#endif
 	if (!fp) {
 		fprintf(stderr, "funpack: cannot create: %s\n", full_path);
 		free(full_path);