mirror of
https://github.com/reactos/reactos.git
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273 lines
6.4 KiB
C
273 lines
6.4 KiB
C
/*
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* WHERE.C - file search functions.
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*
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*
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* History:
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*
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* 07/15/95 (Tim Norman)
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* started.
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*
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* 08/08/95 (Matt Rains)
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* i have cleaned up the source code. changes now bring this source
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* into guidelines for recommended programming practice.
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*
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* 12/12/95 (Steffan Kaiser & Tim Norman)
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* added some patches to fix some things and make more efficient
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*
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* 1/6/96 (Tim Norman)
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* fixed a stupid pointer mistake...
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* Thanks to everyone who noticed it!
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*
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* 8/1/96 (Tim Norman)
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* fixed a bug when getenv returns NULL
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*
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* 8/7/96 (Steffan Kaiser and Tim Norman)
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* speed improvements and bug fixes
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*
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* 8/27/96 (Tim Norman)
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* changed code to use pointers directly into PATH environment
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* variable rather than making our own copy. This saves some memory,
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* but requires we write our own function to copy pathnames out of
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* the variable.
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*
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* 12/23/96 (Aaron Kaufman)
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* Fixed a bug in get_paths() that did not point to the first PATH
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* in the environment variable.
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*
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* 7/12/97 (Tim Norman)
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* Apparently, Aaron's bugfix got lost, so I fixed it again.
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*
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* 16 July 1998 (John P. Price)
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* Added stand alone code.
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*
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* 17 July 1998 (John P. Price)
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* Rewrote find_which to use searchpath function
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*
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* 24-Jul-1998 (John P Price <linux-guru@gcfl.net>)
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* fixed bug where didn't check all extensions when path was specified
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*
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* 27-Jul-1998 (John P Price <linux-guru@gcfl.net>)
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* added config.h include
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*
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* 30-Jul-1998 (John P Price <linux-guru@gcfl.net>)
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* fixed so that it find_which returns NULL if filename is not
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* executable (does not have .bat, .com, or .exe extention).
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* Before command would to execute any file with any extension (opps!)
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*
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* 03-Dec-1998 (Eric Kohl <ekohl@abo.rhein-zeitung.de>)
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* Changed find_which().
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*
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* 07-Dec-1998 (Eric Kohl <ekohl@abo.rhein-zeitung.de>)
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* Added ".CMD" extension.
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* Replaced numeric constant by _NR_OF_EXTENSIONS.
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*
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* 26-Feb-1999 (Eric Kohl <ekohl@abo.rhein-zeitung.de>)
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* Replaced find_which() by SearchForExecutable().
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* Now files are searched using the right extension order.
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*
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* 20-Apr-1999 (Eric Kohl <ekohl@abo.rhein-zeitung.de>)
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* Some minor changes and improvements.
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*/
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#include "config.h"
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#include <windows.h>
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#include <string.h>
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#include <stdlib.h>
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#include "cmd.h"
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/* initial size of environment variable buffer */
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#define ENV_BUFFER_SIZE 1024
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static LPTSTR ext[] = {".bat", ".cmd", ".com", ".exe"};
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static INT nExtCount = sizeof(ext) / sizeof(LPTSTR);
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/* searches for file using path info. */
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BOOL
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SearchForExecutable (LPCTSTR pFileName, LPTSTR pFullName)
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{
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TCHAR szPathBuffer[MAX_PATH];
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LPTSTR pszBuffer = NULL;
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DWORD dwBuffer, len;
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INT n;
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LPTSTR p,s,f;
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/* load environment varable PATH into buffer */
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pszBuffer = (LPTSTR)malloc (ENV_BUFFER_SIZE * sizeof(TCHAR));
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dwBuffer = GetEnvironmentVariable (_T("PATH"), pszBuffer, ENV_BUFFER_SIZE);
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if (dwBuffer > ENV_BUFFER_SIZE)
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{
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pszBuffer = (LPTSTR)realloc (pszBuffer, dwBuffer * sizeof (TCHAR));
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GetEnvironmentVariable (_T("PATH"), pszBuffer, dwBuffer * sizeof (TCHAR));
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}
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/* initialize full name buffer */
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*pFullName = _T('\0');
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if (!(p = _tcsrchr (pFileName, _T('.'))) ||
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_tcschr (p + 1, _T('\\')))
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{
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/* There is no extension ==> test all the extensions. */
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#ifdef _DEBUG
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DebugPrintf (_T("No filename extension!\n"));
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#endif
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/* search in current directory */
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len = GetCurrentDirectory (MAX_PATH, szPathBuffer);
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if (szPathBuffer[len - 1] != _T('\\'))
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{
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szPathBuffer[len] = _T('\\');
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szPathBuffer[len + 1] = _T('\0');
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}
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_tcscat (szPathBuffer, pFileName);
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p = szPathBuffer + _tcslen (szPathBuffer);
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for (n = 0; n < nExtCount; n++)
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{
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_tcscpy (p, ext[n]);
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#ifdef _DEBUG
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DebugPrintf (_T("Testing: \'%s\'\n"), szPathBuffer);
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#endif
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if (IsValidFileName (szPathBuffer))
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{
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#ifdef _DEBUG
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DebugPrintf (_T("Found: \'%s\'\n"), szPathBuffer);
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#endif
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free (pszBuffer);
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_tcscpy (pFullName, szPathBuffer);
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return TRUE;
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}
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}
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/* search in PATH */
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s = pszBuffer;
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while (s && *s)
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{
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f = _tcschr (s, _T(';'));
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if (f)
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{
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_tcsncpy (szPathBuffer, s, (size_t)(f-s));
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szPathBuffer[f-s] = _T('\0');
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s = f + 1;
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}
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else
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{
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_tcscpy (szPathBuffer, s);
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s = NULL;
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}
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len = _tcslen(szPathBuffer);
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if (szPathBuffer[len - 1] != _T('\\'))
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{
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szPathBuffer[len] = _T('\\');
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szPathBuffer[len + 1] = _T('\0');
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}
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_tcscat (szPathBuffer, pFileName);
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p = szPathBuffer + _tcslen (szPathBuffer);
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for (n = 0; n < nExtCount; n++)
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{
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_tcscpy (p, ext[n]);
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#ifdef _DEBUG
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DebugPrintf (_T("Testing: \'%s\'\n"), szPathBuffer);
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#endif
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if (IsValidFileName (szPathBuffer))
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{
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#ifdef _DEBUG
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DebugPrintf (_T("Found: \'%s\'\n"), szPathBuffer);
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#endif
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free (pszBuffer);
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_tcscpy (pFullName, szPathBuffer);
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return TRUE;
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}
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}
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}
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}
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else
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{
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/* There is an extension and it is in the last path component, */
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/* so don't test all the extensions. */
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#ifdef _DEBUG
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DebugPrintf (_T("Filename extension!\n"));
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#endif
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/* search in current directory */
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len = GetCurrentDirectory (MAX_PATH, szPathBuffer);
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if (szPathBuffer[len - 1] != _T('\\'))
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{
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szPathBuffer[len] = _T('\\');
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szPathBuffer[len + 1] = _T('\0');
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}
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_tcscat (szPathBuffer, pFileName);
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#ifdef _DEBUG
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DebugPrintf (_T("Testing: \'%s\'\n"), szPathBuffer);
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#endif
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if (IsValidFileName (szPathBuffer))
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{
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#ifdef _DEBUG
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DebugPrintf (_T("Found: \'%s\'\n"), szPathBuffer);
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#endif
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free (pszBuffer);
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_tcscpy (pFullName, szPathBuffer);
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return TRUE;
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}
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/* search in PATH */
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s = pszBuffer;
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while (s && *s)
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{
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f = _tcschr (s, _T(';'));
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if (f)
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{
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_tcsncpy (szPathBuffer, s, (size_t)(f-s));
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szPathBuffer[f-s] = _T('\0');
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s = f + 1;
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}
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else
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{
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_tcscpy (szPathBuffer, s);
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s = NULL;
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}
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len = _tcslen(szPathBuffer);
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if (szPathBuffer[len - 1] != _T('\\'))
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{
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szPathBuffer[len] = _T('\\');
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szPathBuffer[len + 1] = _T('\0');
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}
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_tcscat (szPathBuffer, pFileName);
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#ifdef _DEBUG
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DebugPrintf (_T("Testing: \'%s\'\n"), szPathBuffer);
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#endif
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if (IsValidFileName (szPathBuffer))
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{
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#ifdef _DEBUG
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DebugPrintf (_T("Found: \'%s\'\n"), szPathBuffer);
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#endif
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free (pszBuffer);
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_tcscpy (pFullName, szPathBuffer);
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return TRUE;
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}
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}
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}
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free (pszBuffer);
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return FALSE;
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}
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