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Hash :
7b089321
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Date :
2025-01-01T09:24:36
maint: run 'make update-copyright'
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/* Copyright (C) 2011-2025 Free Software Foundation, Inc.
This file is part of gnulib.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
This file is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification */
#include <wchar.h>
#include <errno.h>
#include <stdlib.h>
#if defined _WIN32 && !defined __CYGWIN__
wchar_t *
wgetcwd (wchar_t *buf, size_t size)
{
wchar_t *result;
/* Uses _wgetcwd.
Documentation:
<https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/getcwd-wgetcwd>
Note that for a directory consisting of LEN wide characters, the SIZE
argument to _wgetcwd needs to be >= LEN + 3, not only >= LEN + 1, with
some versions of the Microsoft runtime libraries. */
/* Handle single size operations. */
if (buf)
{
/* Check SIZE argument. */
if (!size)
{
errno = EINVAL;
return NULL;
}
/* Invoke _wgetcwd as-is. In this case, the caller does not expect
an ENOMEM error; therefore don't use temporary memory. */
return _wgetcwd (buf, size);
}
if (size)
{
/* Allocate room for two more wide characters, so that directory names
of length <= SIZE - 1 can be returned. */
buf = malloc ((size + 2) * sizeof (wchar_t));
if (!buf)
{
errno = ENOMEM;
return NULL;
}
result = _wgetcwd (buf, size + 2);
if (!result)
{
free (buf);
return NULL;
}
if (wcslen (result) >= size)
{
free (buf);
errno = ERANGE;
return NULL;
}
/* Shrink result before returning it. */
wchar_t *shrinked_result = realloc (result, size * sizeof (wchar_t));
if (shrinked_result != NULL)
result = shrinked_result;
return result;
}
/* Flexible sizing requested. Avoid over-allocation for the common
case of a name that fits within a 4k page, minus some space for
local variables, to be sure we don't skip over a guard page. */
{
wchar_t tmp[4032 / sizeof (wchar_t)];
size = sizeof tmp / sizeof (wchar_t);
wchar_t *ptr = _wgetcwd (tmp, size);
if (ptr)
{
result = _wcsdup (ptr);
if (!result)
errno = ENOMEM;
return result;
}
if (errno != ERANGE)
return NULL;
}
/* My what a large directory name we have. */
do
{
size <<= 1;
wchar_t *ptr = realloc (buf, size * sizeof (wchar_t));
if (ptr == NULL)
{
free (buf);
errno = ENOMEM;
return NULL;
}
buf = ptr;
result = _wgetcwd (buf, size);
}
while (!result && errno == ERANGE);
if (!result)
free (buf);
else
{
/* Here result == buf. */
/* Shrink result before returning it. */
size_t actual_size = wcslen (result) + 1;
if (actual_size < size)
{
wchar_t *shrinked_result =
realloc (result, actual_size * sizeof (wchar_t));
if (shrinked_result != NULL)
result = shrinked_result;
}
}
return result;
}
#endif