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1//
2// wchmod.cpp
3//
4// Copyright (c) Microsoft Corporation. All rights reserved.
5//
6// The _wchmod() function, which changes file attributes.
7//
8#include <corecrt_internal.h>
9#include <io.h>
10#include <sys/stat.h>
11
12
13
14// Changes the mode of a file. The only supported mode bit is _S_IWRITE, which
15// controls the user write (read-only) attribute of the file. Returns zero if
16// successful; returns -1 and sets errno and _doserrno on failure.
17extern "C" int __cdecl _wchmod(wchar_t const* const path, int const mode)
18{
19 _VALIDATE_CLEAR_OSSERR_RETURN(path != nullptr, EINVAL, -1);
20
21 WIN32_FILE_ATTRIBUTE_DATA attributes;
22 if (!GetFileAttributesExW(path, GetFileExInfoStandard, &attributes))
23 {
24 __acrt_errno_map_os_error(GetLastError());
25 return -1;
26 }
27
28 // Set or clear the read-only flag:
29 if (mode & _S_IWRITE)
30 {
31 attributes.dwFileAttributes &= ~FILE_ATTRIBUTE_READONLY;
32 }
33 else
34 {
35 attributes.dwFileAttributes |= FILE_ATTRIBUTE_READONLY;
36 }
37
38 if (!SetFileAttributesW(path, attributes.dwFileAttributes))
39 {
40 __acrt_errno_map_os_error(GetLastError());
41 return -1;
42 }
43
44 return 0;
45}