/***
*execvp.c - execute a file and search along PATH
*
*	Copyright (c) 1985-1991, Microsoft Corporation. All rights reserved.
*
*Purpose:
*	defines _execvp() - execute a file and search along PATH
*
*Revision History:
*	10-17-83  RN	written
*	10-29-85  TC	added execvpe capability
*	12-11-87  JCR	Added "_LOAD_DS" to declaration
*	11-20-89  GJF	Fixed copyright, indents. Added const attribute to
*			types of filename and argvector.
*	03-08-90  GJF	Replaced _LOAD_DS with _CALLTYPE1, added #include
*			<cruntime.h> and removed #include <register.h>
*	05-21-90  GJF	Fixed stack checking pragma syntax.
*	08-24-90  SBM	Removed check_stack pragma since workhorse execve
*			does stack checks
*	09-27-90  GJF	New-style function declarator.
*	01-17-91  GJF	ANSI naming.
*	02-14-90  SRW   Use NULL instead of _environ to get default.
*
*******************************************************************************/

#include <cruntime.h>
#include <stdlib.h>
#include <process.h>

/***
*int _execvp(filename, argvector) - execute file; search along PATH
*
*Purpose:
*	Execute the given file with given path and current environ.
*	try to execute the file. start with the name itself (directory '.'),
*	and if that doesn't work start prepending pathnames from the
*	environment until one works or we run out. if the file is a pathname,
*	don't go to the environment to get alternate paths. if errno comes
*	back ENOEXEC, try it as a shell command file with up to MAXARGS-2
*	arguments from the original vector. if a needed text file is busy,
*	wait a little while and try again before despairing completely
*	Actually calls _execvpe() to do all the work.
*
*Entry:
*	char *filename	 - file to execute
*	char **argvector - vector of arguments
*
*Exit:
*	destroys the calling process (hopefully)
*	if fails, returns -1
*
*Exceptions:
*
*******************************************************************************/

int _CALLTYPE1 _execvp (
	REG3 const char *filename,
	const char * const *argvector
	)
{
	return _execvpe( filename, argvector, NULL );
}