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/*
libfakechroot -- fake chroot environment
Copyright (c) 2010, 2013 Piotr Roszatycki <dexter@debian.org>
This 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.
This 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 this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <config.h>
#include <stdarg.h>
#include <stddef.h>
#ifdef HAVE_ALLOCA_H
# include <alloca.h>
#endif
#include <stdlib.h>
#include <unistd.h>
#include "libfakechroot.h"
/*
execlp function taken from GNU C Library.
Copyright (C) 1991,93,96,97,98,99,2002,2005 Free Software Foundation, Inc.
*/
wrapper(execlp, int, (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;
va_start(args, arg);
debug("execlp(\"%s\", \"%s\", ...)", file, arg);
argv[0] = arg;
i = 0;
while (argv[i++] != NULL) {
if (i == argv_max) {
const char **nptr = alloca((argv_max *= 2) * sizeof(const char *));
if ((char *) argv + i == (char *) nptr)
/* Stack grows up. */
argv_max += i;
else
/* 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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