75 lines
2.1 KiB
C
75 lines
2.1 KiB
C
/* 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);
|
|
}
|