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att
GitHub Repository: att/ast
 Path: blob/master/src/lib/libast/comp/execvpe.c
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/***********************************************************************

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*                                                                      *

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*               This software is part of the ast package               *

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*          Copyright (c) 1985-2011 AT&T Intellectual Property          *

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*                      and is licensed under the                       *

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*                 Eclipse Public License, Version 1.0                  *

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*                    by AT&T Intellectual Property                     *

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*                                                                      *

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*                A copy of the License is available at                 *

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*          http://www.eclipse.org/org/documents/epl-v10.html           *

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*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *

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*                                                                      *

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*              Information and Software Systems Research               *

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*                            AT&T Research                             *

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*                           Florham Park NJ                            *

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*                                                                      *

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*                 Glenn Fowler <[email protected]>                  *

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*                  David Korn <[email protected]>                   *

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*                   Phong Vo <[email protected]>                    *

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*                                                                      *

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***********************************************************************/

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#pragma prototyped

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#include <ast_lib.h>

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#if _lib_execvpe

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#include <ast.h>

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NoN(execvpe)

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#else

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#if defined(__EXPORT__)

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__EXPORT__ int execvpe(const char*, char* const[], char* const[]);

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#endif

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#include <ast.h>

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#include <errno.h>

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#if defined(__EXPORT__)

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#define extern	__EXPORT__

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#endif

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extern int

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execvpe(const char* name, char* const argv[], char* const envv[])

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{

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	register const char*	path = name;

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	char			buffer[PATH_MAX];

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	if (*path != '/' && !(path = pathpath(name, NULL, PATH_REGULAR|PATH_EXECUTE, buffer, sizeof(buffer))))

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		path = name;

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	execve(path, argv, envv);

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	if (errno == ENOEXEC)

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	{

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		register char**	newargv;

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		register char**	ov;

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		register char**	nv;

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		for (ov = (char**)argv; *ov++;);

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		if (newargv = newof(0, char*, ov + 1 - (char**)argv, 0))

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		{

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			nv = newargv;

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			*nv++ = "sh";

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			*nv++ = (char*)path;

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			ov = (char**)argv;

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			while (*nv++ = *++ov);

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			path = pathshell();

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			execve(path, newargv, envv);

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			free(newargv);

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		}

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		else

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			errno = ENOMEM;

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	}

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	return -1;

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}

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#endif

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