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/* Copyright (C) 1991, 93, 96, 97, 98, 99 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <alloca.h>
#include <unistd.h>
#include <stdarg.h>
#include <stddef.h>
#include <string.h>
#include <stackinfo.h>
/* Execute FILE, searching in the `PATH' environment variable if
it contains no slashes, with all arguments after FILE until a
NULL pointer and environment from `environ'. */
int
execlp (const char *file, const char *arg, ...)
{
size_t argv_max = 1024;
const char **argv = alloca (argv_max * sizeof (const char *));
unsigned int i;
va_list args;
argv[0] = arg;
va_start (args, arg);
i = 0;
while (argv[i++] != NULL)
{
if (i == argv_max)
{
const char **nptr = alloca ((argv_max *= 2) * sizeof (const char *));
#ifndef _STACK_GROWS_UP
if ((char *) nptr + argv_max == (char *) argv)
{
/* Stack grows down. */
argv = (const char **) memcpy (nptr, argv,
i * sizeof (const char *));
argv_max += i;
}
else
#endif
#ifndef _STACK_GROWS_DOWN
if ((char *) argv + i == (char *) nptr)
/* Stack grows up. */
argv_max += i;
else
#endif
/* We have a hole in the stack. */
argv = (const char **) memcpy (nptr, argv,
i * sizeof (const char *));
}
argv[i] = va_arg (args, const char *);
}
va_end (args);
return execvp (file, (char *const *) argv);
}
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