diff -r 90a6d6952d83 -r 0b9bea2d7283 dav/system.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dav/system.c	Fri Jun 08 19:58:17 2018 +0200
@@ -0,0 +1,183 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2018 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <dirent.h>
+
+#include "system.h"
+
+void sys_freedirent(SysDirEnt *ent) {
+    free(ent->name);
+    free(ent);
+}
+
+#ifndef _WIN32
+/* ---------- POSIX implementation ---------- */
+
+SYS_DIR sys_opendir(const char *path) {
+    return opendir(path);
+}
+
+SysDirEnt* sys_readdir(SYS_DIR dir) {
+    struct dirent *ent = readdir(dir);
+    if(ent) {
+        SysDirEnt *e = malloc(sizeof(SysDirEnt));
+        e->name = strdup(ent->d_name);
+        return e;
+    }
+    return NULL;
+}
+
+void sys_closedir(SYS_DIR dir) {
+    closedir(dir);
+}
+
+FILE* sys_fopen(const char *path, const char *mode) {
+    return fopen(path, mode);
+}
+
+int sys_stat(const char *path, SYS_STAT *s) {
+    return stat(path, s);
+}
+
+
+#else
+/* ---------- Windows implementation ---------- */
+
+static wchar_t* path2winpath(const char *path, int dir, int *newlen) {
+    size_t len = strlen(path);
+    size_t lenadd = dir ? 2 : 0;
+    
+    
+    wchar_t *wpath = calloc(len+lenadd, sizeof(wchar_t));
+    int wlen = MultiByteToWideChar(
+            CP_UTF8,
+            0,
+            path,
+            len,
+            wpath,
+            len+1
+            );
+    if(newlen) {
+        *newlen = wlen;
+    }
+    for(int i=0;i<wlen;i++) {
+        if(wpath[i] == L'/') {
+            wpath[i] = L'\\';
+        }
+    }
+    
+    if(dir) {
+        if(wpath[wlen-1] != L'\\') {
+            wpath[wlen++] = L'\\';
+        }
+        wpath[wlen++] = L'*';
+    }
+    wpath[wlen] = 0;
+    
+    return wpath;
+} 
+
+SYS_DIR sys_opendir(const char *path) {
+    struct WinDir *dir = malloc(sizeof(struct WinDir));
+    wchar_t *dirpath = path2winpath(path, TRUE, NULL);
+    if(!dirpath) {
+        fprintf(stderr, "Cannot convert path \"%s\" to UTF16\n", path);
+        free(dir);
+        return NULL;
+    }
+    dir->first = 1;
+    dir->handle = FindFirstFileW(dirpath, &dir->finddata);
+    free(dirpath);
+    if(dir->handle == INVALID_HANDLE_VALUE) {
+        free(dir);
+        return NULL;
+    }
+    return dir;
+}
+
+SysDirEnt* sys_readdir(SYS_DIR dir) {
+    if(dir->first) {
+        dir->first = 0;
+    } else {
+        if(FindNextFileW(dir->handle, &dir->finddata) == 0) {
+            return NULL;
+        }
+    }
+    
+    size_t namelen = wcslen(dir->finddata.cFileName);
+    
+    char *name = malloc((namelen+1)*4);
+    int nlen = WideCharToMultiByte(
+            CP_UTF8,
+            0,
+            dir->finddata.cFileName,
+            -1,
+            name,
+            256,
+            NULL,
+            NULL);
+    if(nlen > 0) {
+        name[nlen] = 0;
+        SysDirEnt *ent = malloc(sizeof(SysDirEnt));
+        ent->name = name;
+        return ent;
+    } else {
+        return NULL;
+    }
+}
+
+void sys_closedir(SYS_DIR dir) {
+    FindClose(dir->handle);
+    free(dir);
+}
+
+FILE* sys_fopen(const char *path, const char *mode) {
+    wchar_t *fpath = path2winpath(path, FALSE, NULL); 
+    wchar_t *fmode = path2winpath(mode, FALSE, NULL);
+    
+    FILE *file = (fpath && fmode) ? _wfopen(fpath, fmode) : NULL;
+    free(fpath);
+    free(fmode);
+    return file;
+}
+
+int sys_stat(const char *path, SYS_STAT *s) {
+    wchar_t *fpath = path2winpath(path, FALSE, NULL);
+    if(!fpath) {
+        fprintf(stderr, "Cannot convert path \"%s\" to UTF16\n", path);
+        return -1;
+    }
+    int ret = _wstat64(fpath, s);
+    free(fpath);
+    return ret;
+}
+
+#endif
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