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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
/***
*splitpath.c - break down path name into components
*
*
*Purpose:
* To provide support for accessing the individual components of an
* arbitrary path name
*
*******************************************************************************/
#include "stdafx.h"
#include "winwrap.h"
#include "utilcode.h"
#include "sstring.h"
/***
*SplitPath() - split a path name into its individual components
*
*Purpose:
* to split a path name into its individual components
*
*Entry:
* path - pointer to path name to be parsed
* drive - pointer to buffer for drive component, if any
* dir - pointer to buffer for subdirectory component, if any
* fname - pointer to buffer for file base name component, if any
* ext - pointer to buffer for file name extension component, if any
*
*Exit:
* drive - pointer to drive string. Includes ':' if a drive was given.
* dir - pointer to subdirectory string. Includes leading and trailing
* '/' or '\', if any.
* fname - pointer to file base name
* ext - pointer to file extension, if any. Includes leading '.'.
*
*Exceptions:
*
*******************************************************************************/
void SplitPath(
const WCHAR *path,
__inout_z __inout_ecount_opt(driveSizeInWords) WCHAR *drive, int driveSizeInWords,
__inout_z __inout_ecount_opt(dirSizeInWords) WCHAR *dir, int dirSizeInWords,
__inout_z __inout_ecount_opt(fnameSizeInWords) WCHAR *fname, size_t fnameSizeInWords,
__inout_z __inout_ecount_opt(extSizeInWords) WCHAR *ext, size_t extSizeInWords)
{
WRAPPER_NO_CONTRACT;
LPCWSTR _wszDrive, _wszDir, _wszFileName, _wszExt;
size_t _cchDrive, _cchDir, _cchFileName, _cchExt;
SplitPathInterior(path,
&_wszDrive, &_cchDrive,
&_wszDir, &_cchDir,
&_wszFileName, &_cchFileName,
&_wszExt, &_cchExt);
if (drive && _wszDrive)
wcsncpy_s(drive, driveSizeInWords, _wszDrive, min(_cchDrive, _MAX_DRIVE));
if (dir && _wszDir)
wcsncpy_s(dir, dirSizeInWords, _wszDir, min(_cchDir, _MAX_DIR));
if (fname && _wszFileName)
wcsncpy_s(fname, fnameSizeInWords, _wszFileName, min(_cchFileName, _MAX_FNAME));
if (ext && _wszExt)
wcsncpy_s(ext, extSizeInWords, _wszExt, min(_cchExt, _MAX_EXT));
}
//*******************************************************************************
// A much more sensible version that just points to each section of the string.
//*******************************************************************************
void SplitPathInterior(
__in LPCWSTR wszPath,
__out_opt LPCWSTR *pwszDrive, __out_opt size_t *pcchDrive,
__out_opt LPCWSTR *pwszDir, __out_opt size_t *pcchDir,
__out_opt LPCWSTR *pwszFileName, __out_opt size_t *pcchFileName,
__out_opt LPCWSTR *pwszExt, __out_opt size_t *pcchExt)
{
LIMITED_METHOD_CONTRACT;
// Arguments must come in valid pairs
_ASSERTE(!!pwszDrive == !!pcchDrive);
_ASSERTE(!!pwszDir == !!pcchDir);
_ASSERTE(!!pwszFileName == !!pcchFileName);
_ASSERTE(!!pwszExt == !!pcchExt);
WCHAR *p;
LPCWSTR last_slash = NULL, dot = NULL;
/* we assume that the path argument has the following form, where any
* or all of the components may be missing.
*
* <drive><dir><fname><ext>
*
* and each of the components has the following expected form(s)
*
* drive:
* 0 to _MAX_DRIVE-1 characters, the last of which, if any, is a
* ':'
* dir:
* 0 to _MAX_DIR-1 characters in the form of an absolute path
* (leading '/' or '\') or relative path, the last of which, if
* any, must be a '/' or '\'. E.g -
* absolute path:
* \top\next\last\ ; or
* /top/next/last/
* relative path:
* top\next\last\ ; or
* top/next/last/
* Mixed use of '/' and '\' within a path is also tolerated
* fname:
* 0 to _MAX_FNAME-1 characters not including the '.' character
* ext:
* 0 to _MAX_EXT-1 characters where, if any, the first must be a
* '.'
*
*/
/* extract drive letter and :, if any */
if ((wcslen(wszPath) > (_MAX_DRIVE - 2)) && (*(wszPath + _MAX_DRIVE - 2) == _T(':'))) {
if (pwszDrive && pcchDrive) {
*pwszDrive = wszPath;
*pcchDrive = _MAX_DRIVE - 1;
}
wszPath += _MAX_DRIVE - 1;
}
else if (pwszDrive && pcchDrive) {
*pwszDrive = NULL;
*pcchDrive = 0;
}
/* extract path string, if any. Path now points to the first character
* of the path, if any, or the filename or extension, if no path was
* specified. Scan ahead for the last occurence, if any, of a '/' or
* '\' path separator character. If none is found, there is no path.
* We will also note the last '.' character found, if any, to aid in
* handling the extension.
*/
for (last_slash = NULL, p = (WCHAR *)wszPath; *p; p++) {
#ifdef _MBCS
if (_ISLEADBYTE (*p))
p++;
else {
#endif /* _MBCS */
if (*p == _T('/') || *p == _T('\\'))
/* point to one beyond for later copy */
last_slash = p + 1;
else if (*p == _T('.'))
dot = p;
#ifdef _MBCS
}
#endif /* _MBCS */
}
if (last_slash) {
/* found a path - copy up through last_slash or max. characters
* allowed, whichever is smaller
*/
if (pwszDir && pcchDir) {
*pwszDir = wszPath;
*pcchDir = last_slash - wszPath;
}
wszPath = last_slash;
}
else if (pwszDir && pcchDir) {
*pwszDir = NULL;
*pcchDir = 0;
}
/* extract file name and extension, if any. Path now points to the
* first character of the file name, if any, or the extension if no
* file name was given. Dot points to the '.' beginning the extension,
* if any.
*/
if (dot && (dot >= wszPath)) {
/* found the marker for an extension - copy the file name up to
* the '.'.
*/
if (pwszFileName && pcchFileName) {
*pwszFileName = wszPath;
*pcchFileName = dot - wszPath;
}
/* now we can get the extension - remember that p still points
* to the terminating nul character of path.
*/
if (pwszExt && pcchExt) {
*pwszExt = dot;
*pcchExt = p - dot;
}
}
else {
/* found no extension, give empty extension and copy rest of
* string into fname.
*/
if (pwszFileName && pcchFileName) {
*pwszFileName = wszPath;
*pcchFileName = p - wszPath;
}
if (pwszExt && pcchExt) {
*pwszExt = NULL;
*pcchExt = 0;
}
}
}
/***
*SplitPath() - split a path name into its individual components
*
*Purpose:
* to split a path name into its individual components
*
*Entry:
* path - SString representing the path name to be parsed
* drive - Out SString for drive component
* dir - Out SString for subdirectory component
* fname - Out SString for file base name component
* ext - Out SString for file name extension component
*
*Exit:
* drive - Drive string. Includes ':' if a drive was given.
* dir - Subdirectory string. Includes leading and trailing
* '/' or '\', if any.
* fname - File base name
* ext - File extension, if any. Includes leading '.'.
*
*Exceptions:
*
*******************************************************************************/
void SplitPath(__in SString const &path,
__inout_opt SString *drive,
__inout_opt SString *dir,
__inout_opt SString *fname,
__inout_opt SString *ext)
{
LPCWSTR wzDrive, wzDir, wzFname, wzExt;
size_t cchDrive, cchDir, cchFname, cchExt;
SplitPathInterior(path,
&wzDrive, &cchDrive,
&wzDir, &cchDir,
&wzFname, &cchFname,
&wzExt, &cchExt);
if (drive != NULL)
drive->Set(wzDrive, (COUNT_T)cchDrive);
if (dir != NULL)
dir->Set(wzDir, (COUNT_T)cchDir);
if (fname != NULL)
fname->Set(wzFname, (COUNT_T)cchFname);
if (ext != NULL)
ext->Set(wzExt, (COUNT_T)cchExt);
}
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