MSYS bash stub

bash.c

#include <WinSDKVer.h>

#define _MBCS 1
#define MBCS 1

// Target Windows 2000 & higher
#define WINVER 0x0500
#define _WIN32_WINNT 0x0500

// Speed up build process with minimal headers.
#define WIN32_LEAN_AND_MEAN
#define VC_EXTRALEAN

#include <SDKDDKVer.h>

#include <windows.h>
#include <tchar.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <process.h>
#include <io.h>

/* Macros for prettier code. */
#ifndef MAX_PATH
#	define MAX_PATH _MAX_PATH
#endif

#define zstr(str,sz) memset(str, '\0', sz)
#define tchar TCHAR
#define ctstr ctchar*
#define tstr tchar*

#ifdef _UNICODE
#	define _tspawnvp _wspawnvp
#	define _tspawnlp _wspawnlp
#else
#	define _tspawnvp _spawnvp
#	define _tspawnlp _spawnlp
#endif

#ifndef MAX_PATH
#	define MAX_PATH _MAX_PATH
#endif

#ifndef TEXT
#	define TEXT _T
#endif

#ifndef TC
#	define TC _T
#endif

#define EMPTY TEXT("")

static int exec_cmd(tchar* cmd, tchar** args)
{
	return (args == NULL) ?
	(int)_tspawnlp(_P_WAIT, cmd, cmd, NULL) :
	(int)_tspawnvp(_P_WAIT, cmd,  (const tchar* const*)args);
}

int _tmain(int argc, tchar* argv[])
{
	UINT cpOld;
	int result, i = -1;
	TCHAR pProg[MAX_PATH+1] = EMPTY,
		pMsysRoot[MAX_PATH+10] = EMPTY, // MAX_PATH + len("MSYSROOT=") + 1
		pHome[MAX_PATH+6] = EMPTY, // MAX_PATH + len("HOME=") + 1
		//pPath[_MAX_ENV+6] = EMPTY, // _MAX_ENV + len("PATH=") + 1
		//*pCurrPath = NULL,
		*pUserName = NULL,
		*pRoot = NULL;
	
	if((pRoot = _tgetenv(TEXT("MINGWROOT"))) == NULL) {
		_tprintf(TEXT("FATAL: Could not locate mingw root.\n"));
		ExitProcess(1);
	}
	
	/*if((pCurrPath = _tgetenv(TEXT("PATH"))) == NULL) {
		_tprintf(TEXT("FATAL: Could not get PATH.\n"));
		ExitProcess(1);
	}*/
	
	if((pUserName = _tgetenv(TEXT("USERNAME"))) == NULL) {
		_tprintf(TEXT("FATAL: Could not get current user.\n"));
		ExitProcess(1);
	}
	
	_tcscpy(pHome, TEXT("HOME="));
	_tcscpy(pMsysRoot, TEXT("MSYSROOT="));
	//_tcscpy(pPath, TEXT("PATH="));
	
	_tcsncat(pHome, pRoot, MAX_PATH+5);
	_tcsncat(pHome, TEXT("\\msys\\1.0\\home\\"), MAX_PATH+5);
	_tcsncat(pHome, pUserName, MAX_PATH+5);
	
	_tcsncat(pMsysRoot, pRoot, MAX_PATH+9);
	_tcsncat(pMsysRoot, TEXT("\\msys\\1.0\\"), MAX_PATH+9);
	
	while(pHome[++i] != TC('\0'))
		if(pHome[i] == TC('\\'))
			pHome[i] = TC('/');
	
	_tputenv(pHome);
	_tputenv(pMsysRoot);
	_tputenv(TEXT("MSYSCON=sh.exe"));
	_tputenv(TEXT("PLINK_PROTOCOL=ssh"));
	
	_tcsncpy(pProg, pRoot, MAX_PATH);
	_tcsncat(pProg, TEXT("\\msys\\1.0\\bin\\bash.exe"), MAX_PATH);
	argv[0] = pProg;
	
	cpOld = GetConsoleOutputCP();
	SetConsoleOutputCP(1252);
	
	result = exec_cmd(pProg, argv);
	SetConsoleOutputCP(cpOld);
	return result;
}