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Tricks of the Windows Gam…ming Gurus (2nd Edition)
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Disc2.iso
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vc98
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crt
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src
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spawnlpe.c
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1998-06-17
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/***
*spawnlpe.c - spawn a child process with environ and search along PATH
*
* Copyright (c) 1985-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* defines _spawnlpe() - spawn a child process with environ/PATH search
*
*******************************************************************************/
#include <cruntime.h>
#include <stddef.h>
#include <process.h>
#include <stdarg.h>
#include <internal.h>
#include <malloc.h>
#include <tchar.h>
#include <dbgint.h>
/***
*int _spawnlpe(modeflag, filename, arglist) - spawn a child process
*
*Purpose:
* Spawns a child process.
* formats the parameters and calls _spawnvpe to do the work of searching
* the PATH environment variable and calling _spawnve. The NULL
* environment pointer indicates that the new process will inherit the
* parents process's environment. NOTE - at least one argument must be
* present. This argument is always, by convention, the name of the file
* being spawned.
*
*Entry:
* int modeflag - defines what mode of spawn (WAIT, NOWAIT, OVERLAY)
* only WAIT and OVERLAY currently supported
* _TSCHAR *pathname - file to spawn
* _TSCHAR *arglist - list of arguments (environ at end)
* call as _spawnlpe(modeflag, path, arg0, arg1, ..., argn, NULL, envp);
*
*Exit:
* returns exit code of spawned process
* returns -1 if fails
*
*Exceptions:
*
*******************************************************************************/
int __cdecl _tspawnlpe (
int modeflag,
const _TSCHAR *filename,
const _TSCHAR *arglist,
...
)
{
#ifdef _M_IX86
REG1 const _TSCHAR **argp;
_ASSERTE(filename != NULL);
_ASSERTE(*filename != _T('\0'));
_ASSERTE(arglist != NULL);
_ASSERTE(*arglist != _T('\0'));
argp = &arglist;
while (*argp++)
;
return(_tspawnvpe(modeflag,filename,&arglist,(_TSCHAR **)*argp));
#else /* _M_IX86 */
va_list vargs;
_TSCHAR * argbuf[64];
_TSCHAR ** argv;
_TSCHAR ** envp;
int result;
_ASSERTE(filename != NULL);
_ASSERTE(*filename != _T('\0'));
_ASSERTE(arglist != NULL);
_ASSERTE(*arglist != _T('\0'));
va_start(vargs, arglist);
#ifdef WPRFLAG
argv = _wcapture_argv(&vargs, arglist, argbuf, 64);
#else /* WPRFLAG */
argv = _capture_argv(&vargs, arglist, argbuf, 64);
#endif /* WPRFLAG */
envp = va_arg(vargs, _TSCHAR **);
va_end(vargs);
result = _tspawnvpe(modeflag,filename,argv,envp);
if (argv && argv != argbuf)
_free_crt(argv);
return result;
#endif /* _M_IX86 */
}