Win32: non-ASCII directory names support in ngx_getcwd().

This makes it possible to start nginx without a prefix explicitly set
in a directory with non-ASCII characters in it.

src/os/win32/ngx_files.c

@@ -429,6 +429,40 @@ ngx_realpath(u_char *path, u_char *resolved)
 }
 
 
+size_t
+ngx_getcwd(u_char *buf, size_t size)
+{
+    u_char   *p;
+    size_t    n;
+    u_short   utf16[NGX_MAX_PATH];
+
+    n = GetCurrentDirectoryW(NGX_MAX_PATH, utf16);
+
+    if (n == 0) {
+        return 0;
+    }
+
+    if (n > NGX_MAX_PATH) {
+        ngx_set_errno(ERROR_INSUFFICIENT_BUFFER);
+        return 0;
+    }
+
+    p = ngx_utf16_to_utf8(buf, utf16, &size, NULL);
+
+    if (p == NULL) {
+        return 0;
+    }
+
+    if (p != buf) {
+        ngx_free(p);
+        ngx_set_errno(ERROR_INSUFFICIENT_BUFFER);
+        return 0;
+    }
+
+    return size - 1;
+}
+
+
 ngx_int_t
 ngx_open_dir(ngx_str_t *name, ngx_dir_t *dir)
 {

src/os/win32/ngx_files.h

@@ -178,8 +178,12 @@ void ngx_close_file_mapping(ngx_file_mapping_t *fm);
 
 u_char *ngx_realpath(u_char *path, u_char *resolved);
 #define ngx_realpath_n              ""
-#define ngx_getcwd(buf, size)       GetCurrentDirectory(size, (char *) buf)
+
+
+size_t ngx_getcwd(u_char *buf, size_t size);
 #define ngx_getcwd_n                "GetCurrentDirectory()"
+
+
 #define ngx_path_separator(c)       ((c) == '/' || (c) == '\\')
 
 #define NGX_HAVE_MAX_PATH           1