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//
// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
//
/***
*makepath.c - create path name from components
*
*
*Purpose:
* To provide support for creation of full path names from components
*
*******************************************************************************/
#include "stdafx.h"
#include "winwrap.h"
#include "utilcode.h"
#include "ex.h"
/***
*void _makepath() - build path name from components
*
*Purpose:
* create a path name from its individual components
*
*Entry:
* WCHAR *path - pointer to buffer for constructed path
* WCHAR *drive - pointer to drive component, may or may not contain
* trailing ':'
* WCHAR *dir - pointer to subdirectory component, may or may not include
* leading and/or trailing '/' or '\' characters
* WCHAR *fname - pointer to file base name component
* WCHAR *ext - pointer to extension component, may or may not contain
* a leading '.'.
*
*Exit:
* path - pointer to constructed path name
*
*Exceptions:
*
*******************************************************************************/
void MakePath (
__out_ecount (MAX_PATH) WCHAR *path,
__in LPCWSTR drive,
__in LPCWSTR dir,
__in LPCWSTR fname,
__in LPCWSTR ext
)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
FORBID_FAULT;
}
CONTRACTL_END
const WCHAR *p;
DWORD count = 0;
/* we assume that the arguments are in the following form (although we
* do not diagnose invalid arguments or illegal filenames (such as
* names longer than 8.3 or with illegal characters in them)
*
* drive:
* A ; or
* A:
* dir:
* \top\next\last\ ; or
* /top/next/last/ ; or
* either of the above forms with either/both the leading
* and trailing / or \ removed. Mixed use of '/' and '\' is
* also tolerated
* fname:
* any valid file name
* ext:
* any valid extension (none if empty or null )
*/
/* copy drive */
if (drive && *drive) {
*path++ = *drive;
*path++ = _T(':');
count += 2;
}
/* copy dir */
if ((p = dir)) {
while (*p) {
*path++ = *p++;
count++;
if (count == MAX_PATH) {
--path;
*path = _T('\0');
return;
}
}
#ifdef _MBCS
if (*(p=_mbsdec(dir,p)) != _T('/') && *p != _T('\\')) {
#else /* _MBCS */
// suppress warning for the following line; this is safe but would require significant code
// delta for prefast to understand.
#ifdef _PREFAST_
#pragma warning( suppress: 26001 )
#endif
if (*(p-1) != _T('/') && *(p-1) != _T('\\')) {
#endif /* _MBCS */
*path++ = _T('\\');
count++;
if (count == MAX_PATH) {
--path;
*path = _T('\0');
return;
}
}
}
/* copy fname */
if ((p = fname)) {
while (*p) {
*path++ = *p++;
count++;
if (count == MAX_PATH) {
--path;
*path = _T('\0');
return;
}
}
}
/* copy ext, including 0-terminator - check to see if a '.' needs
* to be inserted.
*/
if ((p = ext)) {
if (*p && *p != _T('.')) {
*path++ = _T('.');
count++;
if (count == MAX_PATH) {
--path;
*path = _T('\0');
return;
}
}
while ((*path++ = *p++)) {
count++;
if (count == MAX_PATH) {
--path;
*path = _T('\0');
return;
}
}
}
else {
/* better add the 0-terminator */
*path = _T('\0');
}
}
#if !defined(FEATURE_CORECLR)
static LPCWSTR g_wszProcessExePath = NULL;
HRESULT GetProcessExePath(LPCWSTR *pwszProcessExePath)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
CONSISTENCY_CHECK(CheckPointer(pwszProcessExePath));
}
CONTRACTL_END;
HRESULT hr = S_OK;
if (g_wszProcessExePath == NULL)
{
NewArrayHolder<WCHAR> wszProcName = new (nothrow) WCHAR[_MAX_PATH];
IfNullRet(wszProcName);
DWORD cchProcName = WszGetModuleFileName(NULL, wszProcName, _MAX_PATH);
if (cchProcName == 0)
{
return HRESULT_FROM_GetLastError();
}
if (InterlockedCompareExchangeT(&g_wszProcessExePath, const_cast<LPCWSTR>(wszProcName.GetValue()), NULL) == NULL)
{
wszProcName.SuppressRelease();
}
}
_ASSERTE(g_wszProcessExePath != NULL);
_ASSERTE(SUCCEEDED(hr));
*pwszProcessExePath = g_wszProcessExePath;
return hr;
}
#endif
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