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/*******************************************************************************
* Copyright (c) 2006 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
* Andrew Niefer
*******************************************************************************/
#include "eclipseCommon.h"
#include "eclipseUnicode.h"
#ifdef _WIN32
#include <direct.h>
#include <windows.h>
#else
#include <unistd.h>
#include <strings.h>
#include <dirent.h>
#endif
#include <stdlib.h>
#include <sys/stat.h>
/* Global Variables */
_TCHAR* officialName = NULL;
/* Local Variables */
#ifndef _WIN32
static _TCHAR* filterPrefix = NULL; /* prefix for the find files filter */
static int prefixLength = 0;
#endif
/**
* Convert a wide string to a narrow one
* Caller must free the null terminated string returned.
*/
char *toNarrow(_TCHAR* src)
{
#ifdef UNICODE
int byteCount = WideCharToMultiByte (CP_ACP, 0, (wchar_t *)src, -1, NULL, 0, NULL, NULL);
char *dest = malloc(byteCount+1);
dest[byteCount] = 0;
WideCharToMultiByte (CP_UTF8, 0, (wchar_t *)src, -1, dest, byteCount, NULL, NULL);
return dest;
#else
return _tcsdup(src);
#endif
}
/*
* Find the absolute pathname to where a command resides.
*
* The string returned by the function must be freed.
*/
#define EXTRA 20
_TCHAR* findCommand( _TCHAR* command )
{
_TCHAR* cmdPath;
int length;
_TCHAR* ch;
_TCHAR* dir;
_TCHAR* path;
struct _stat stats;
/* If the command was an abolute pathname, use it as is. */
if (command[0] == dirSeparator ||
(_tcslen( command ) > 2 && command[1] == _T_ECLIPSE(':')))
{
length = _tcslen( command );
cmdPath = malloc( (length + EXTRA) * sizeof(_TCHAR) ); /* add extra space for a possible ".exe" extension */
_tcscpy( cmdPath, command );
}
else
{
/* If the command string contains a path separator */
if (_tcschr( command, dirSeparator ) != NULL)
{
/* It must be relative to the current directory. */
length = MAX_PATH_LENGTH + EXTRA + _tcslen( command );
cmdPath = malloc( length * sizeof (_TCHAR));
_tgetcwd( cmdPath, length );
if (cmdPath[ _tcslen( cmdPath ) - 1 ] != dirSeparator)
{
length = _tcslen( cmdPath );
cmdPath[ length ] = dirSeparator;
cmdPath[ length+1 ] = _T_ECLIPSE('\0');
}
_tcscat( cmdPath, command );
}
/* else the command must be in the PATH somewhere */
else
{
/* Get the directory PATH where executables reside. */
path = _tgetenv( _T_ECLIPSE("PATH") );
if (!path)
{
return NULL;
}
else
{
length = _tcslen( path ) + _tcslen( command ) + MAX_PATH_LENGTH;
cmdPath = malloc( length * sizeof(_TCHAR));
/* Foreach directory in the PATH */
dir = path;
while (dir != NULL && *dir != _T_ECLIPSE('\0'))
{
ch = _tcschr( dir, pathSeparator );
if (ch == NULL)
{
_tcscpy( cmdPath, dir );
}
else
{
length = ch - dir;
_tcsncpy( cmdPath, dir, length );
cmdPath[ length ] = _T_ECLIPSE('\0');
ch++;
}
dir = ch; /* advance for the next iteration */
#ifdef _WIN32
/* Remove quotes */
if (_tcschr( cmdPath, _T_ECLIPSE('"') ) != NULL)
{
int i = 0, j = 0, c;
length = _tcslen( cmdPath );
while (i < length) {
c = cmdPath[ i++ ];
if (c == _T_ECLIPSE('"')) continue;
cmdPath[ j++ ] = c;
}
cmdPath[ j ] = _T_ECLIPSE('\0');
}
#endif
/* Determine if the executable resides in this directory. */
if (cmdPath[0] == _T_ECLIPSE('.') &&
(_tcslen(cmdPath) == 1 || (_tcslen(cmdPath) == 2 && cmdPath[1] == dirSeparator)))
{
_tgetcwd( cmdPath, MAX_PATH_LENGTH );
}
if (cmdPath[ _tcslen( cmdPath ) - 1 ] != dirSeparator)
{
length = _tcslen( cmdPath );
cmdPath[ length ] = dirSeparator;
cmdPath[ length+1 ] = _T_ECLIPSE('\0');
}
_tcscat( cmdPath, command );
/* If the file is not a directory and can be executed */
if (_tstat( cmdPath, &stats ) == 0 && (stats.st_mode & S_IFREG) != 0)
{
/* Stop searching */
dir = NULL;
}
}
}
}
}
#ifdef _WIN32
/* If the command does not exist */
if (_tstat( cmdPath, &stats ) != 0 || (stats.st_mode & S_IFREG) == 0)
{
/* If the command does not end with .exe, append it an try again. */
length = _tcslen( cmdPath );
if (length > 4 && _tcsicmp( &cmdPath[ length - 4 ], _T_ECLIPSE(".exe") ) != 0)
_tcscat( cmdPath, _T_ECLIPSE(".exe") );
}
#endif
/* Verify the resulting command actually exists. */
if (_tstat( cmdPath, &stats ) != 0 || (stats.st_mode & S_IFREG) == 0)
{
free( cmdPath );
cmdPath = NULL;
}
#if !defined(_WIN32) && !defined(MACOSX)
/* resolve symlinks */
ch = cmdPath;
cmdPath = canonicalize_file_name(cmdPath);
free(ch);
#endif
/* Return the absolute command pathname. */
return cmdPath;
}
#ifndef _WIN32
#ifdef MACOSX
static int filter(struct dirent *dir) {
#else
static int filter(const struct dirent *dir) {
#endif
if(_tcslen(dir->d_name) <= prefixLength)
return 0;
return (_tcsncmp(dir->d_name, filterPrefix, prefixLength) == 0 &&
dir->d_name[prefixLength] == _T_ECLIPSE('_'));
}
#endif
/*
* Looks for files of the form /path/prefix_version.<extension> and returns the full path to
* the file with the largest version number
*/
_TCHAR* findFile( _TCHAR* path, _TCHAR* prefix)
{
struct _stat stats;
int pathLength;
_TCHAR* candidate = NULL;
_TCHAR* result = NULL;
#ifdef _WIN32
_TCHAR* fileName = NULL;
WIN32_FIND_DATA data;
HANDLE handle;
#else
struct dirent **files;
int count;
#endif
/* does path exist? */
if( _tstat(path, &stats) != 0 )
return NULL;
pathLength = _tcslen(path);
#ifdef _WIN32
fileName = malloc( (_tcslen(path) + 1 + _tcslen(prefix) + 3) * sizeof(_TCHAR));
fileName = _tcscpy(fileName, path);
fileName[pathLength] = dirSeparator;
fileName[pathLength + 1] = 0;
_tcscat(fileName, prefix);
_tcscat(fileName, _T_ECLIPSE("_*"));
prefix = fileName;
handle = FindFirstFile(prefix, &data);
if(handle != INVALID_HANDLE_VALUE) {
candidate = _tcsdup(data.cFileName);
while(FindNextFile(handle, &data) != 0) {
fileName = data.cFileName;
/* compare, take the highest version */
if( _tcscmp(candidate, fileName) < 0) {
free(candidate);
candidate = _tcsdup(fileName);
}
}
FindClose(handle);
}
#else
filterPrefix = prefix;
prefixLength = _tcslen(prefix);
/* TODO should write out own comparator to better handle OSGi versions */
count = scandir(path, &files, &filter, alphasort);
if(count > 0) {
candidate = _tcsdup(files[count - 1]->d_name);
}
#endif
if(candidate != NULL) {
result = malloc((pathLength + 1 + _tcslen(candidate) + 1) * sizeof(_TCHAR));
_tcscpy(result, path);
result[pathLength] = dirSeparator;
result[pathLength + 1] = 0;
_tcscat(result, candidate);
free(candidate);
return result;
}
return NULL;
}
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