遍历文件

看到《windows核心编程》里说C/C++程序实际上都是由运行时库中的Startup系列函数（mainCRTStartup，wmainCRTStartup， WinMainCRTStartup，wWinMainCRTStartup）来执行一系列初始化后，再调用程序员写的代码中的main、wmain、WinMain或wWinMain，于是很想看看mainCRTStartup的定义，书上说是在crt0.c里，可是明明没有嘛。书是在windows2000下写的，可能现在的微软C/C++运行时库已经变化很多了。

把crt0.c的几个包含文件都看了下，还是没找到，看来还是得遍历C:\Program Files\Microsoft Visual Studio 9.0\VC\crt\src里面的源码文件来找才行，于是写了一个Python脚本，还挺快的。

import os
def find_file_text(root_dir,target_text):
 suffix=['c','cpp','h','hpp','cxx']
 for root,dirs,files in os.walk(root_dir):
    for file in files:
        file_suffix=file[file.find('.')+1:len(file)]
        if file_suffix in suffix:
            file_obj=open(os.path.join(root, file),'rU')
            line_no=0
            for eachline in file_obj:
                line_no=line_no+1
                if eachline.find(target_text)!=-1:
                    print "%s %d:%s"%(os.path.join(root, file),line_no,eachline)

find_file_text(r'C:\Program Files\Microsoft Visual Studio 9.0\VC\crt\src','mainCRTStartup')

 

终于找到了，原来mainCRTStartup和wmainCRTStartup都是调用的__tmainCRTStartup，在C:\Program Files\Microsoft Visual Studio 9.0\VC\crt\src\crtexe.c中

#ifdef _WINMAIN_

#ifdef WPRFLAG
int wWinMainCRTStartup(
#else 
int WinMainCRTStartup(
#endif 

#else 

#ifdef WPRFLAG
int wmainCRTStartup(
#else 
int mainCRTStartup(
#endif 

#endif 
        void
        )
{
       
        __security_init_cookie();

        return __tmainCRTStartup();
}

__declspec(noinline)
int
__tmainCRTStartup(
        void
        )
{
#ifdef _WINMAIN_
        _TUCHAR *lpszCommandLine;
        STARTUPINFO StartupInfo;
        BOOL inDoubleQuote=FALSE;

        __try {
                       
            GetStartupInfo( &StartupInfo );
        } __except(EXCEPTION_EXECUTE_HANDLER) {
            return 255;
        }
#endif 

       

        __try
        {
           
            void *lock_free=0;
            void *fiberid=((PNT_TIB)NtCurrentTeb())->StackBase;
            int nested=FALSE;
            while((lock_free=InterlockedCompareExchangePointer((volatile PVOID *)&__native_startup_lock, fiberid, 0))!=0)
            {
                if(lock_free==fiberid)
                {
                    nested=TRUE;
                    break;
                }

               
               
                Sleep(1000);
            }

            if (__native_startup_state == __initializing)
            {
                _amsg_exit( _RT_CRT_INIT_CONFLICT);
            }
            else if (__native_startup_state == __uninitialized)
            {
                __native_startup_state = __initializing;
#ifndef _SYSCRT
                if (_initterm_e( __xi_a, __xi_z ) != 0)
                {
                    return 255;
                }
#else 
                _initterm((_PVFV *)(void *)__xi_a, (_PVFV *)(void *)__xi_z);
#endif 
            }
            else
            {
                has_cctor = 1;
            }

           
            if (__native_startup_state == __initializing)
            {
                _initterm( __xc_a, __xc_z );
                __native_startup_state = __initialized;
            }
            _ASSERTE(__native_startup_state == __initialized);
            if(!nested)
            {
               
#pragma warning(push)
#pragma warning(disable:4312)
                InterlockedExchangePointer((volatile PVOID *)&__native_startup_lock, 0);
#pragma warning(pop)
            }

           
            if (__dyn_tls_init_callback != NULL &&
                _IsNonwritableInCurrentImage((PBYTE)&__dyn_tls_init_callback))
            {
                __dyn_tls_init_callback(NULL, DLL_THREAD_ATTACH, NULL);
            }

           
            _CrtSetCheckCount(TRUE);

#ifdef _WINMAIN_
           
#ifdef WPRFLAG
           
            if (_wcmdln == NULL)
                return 255;
            lpszCommandLine = (wchar_t *)_wcmdln;
#else 
            lpszCommandLine = (unsigned char *)_acmdln;
#endif 

            while (*lpszCommandLine > SPACECHAR ||
                   (*lpszCommandLine&&inDoubleQuote)) {
               
                if (*lpszCommandLine==DQUOTECHAR) inDoubleQuote=!inDoubleQuote;
#ifdef _MBCS
                if (_ismbblead(*lpszCommandLine)) {
                    if (lpszCommandLine) {
                        lpszCommandLine++;
                    }
                }
#endif 
                ++lpszCommandLine;
            }

           
            while (*lpszCommandLine && (*lpszCommandLine <= SPACECHAR)) {
                lpszCommandLine++;
            }

#ifdef WPRFLAG
            mainret = wWinMain(
#else 
            mainret = WinMain(
#endif 
                       (HINSTANCE)&__ImageBase,
                       NULL,
                       lpszCommandLine,
                       StartupInfo.dwFlags & STARTF_USESHOWWINDOW
                        ? StartupInfo.wShowWindow
                        : SW_SHOWDEFAULT
                      );
#else 

#ifdef WPRFLAG
            __winitenv = envp;
            mainret = wmain(argc, argv, envp);
#else 
            __initenv = envp;
            mainret = main(argc, argv, envp);
#endif 

#endif 

           
            if ( !managedapp )
                exit(mainret);

            if (has_cctor == 0)
                _cexit();

        }
        __except ( _XcptFilter(GetExceptionCode(), GetExceptionInformation()) )
        {
           

            mainret = GetExceptionCode();

           
            if ( !managedapp )
                _exit(mainret);

            if (has_cctor == 0)
                _cexit();
        }

        return mainret;
}

看的头疼，明天再看了。