mirror of
https://git.zap.org.au/git/trader.git
synced 2025-02-02 15:08:13 -05:00
c7f2343052
The auto-generated files are created by running ./build-aux/bootstrap with Gnulib as at commit d72683055ea46253d8eb8f89341eff5414ae6ca0 (with a date stamp of Sun Jul 24 23:37:17 2011 +0200), Autoconf 2.68 and Automake 1.11.1.
103 lines
2.8 KiB
Plaintext
103 lines
2.8 KiB
Plaintext
# strncat.m4 serial 2
|
|
dnl Copyright (C) 2002-2004, 2009-2011 Free Software Foundation, Inc.
|
|
dnl This file is free software; the Free Software Foundation
|
|
dnl gives unlimited permission to copy and/or distribute it,
|
|
dnl with or without modifications, as long as this notice is preserved.
|
|
|
|
AC_DEFUN_ONCE([gl_FUNC_STRNCAT],
|
|
[
|
|
AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
|
|
AC_REQUIRE([AC_PROG_CC])
|
|
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
|
|
|
|
dnl Check for prerequisites for memory fence checks.
|
|
gl_FUNC_MMAP_ANON
|
|
AC_CHECK_HEADERS_ONCE([sys/mman.h])
|
|
AC_CHECK_FUNCS_ONCE([mprotect])
|
|
|
|
dnl Detect bug in Solaris 8..10 on SPARC:
|
|
dnl strncat should not dereference more than n bytes, but always dereferences
|
|
dnl n+1 bytes if the first n bytes don't contain a NUL byte.
|
|
dnl Assume that strncat works on platforms that lack mprotect.
|
|
AC_CACHE_CHECK([whether strncat works], [gl_cv_func_strncat_works],
|
|
[AC_RUN_IFELSE([AC_LANG_PROGRAM([[
|
|
#include <string.h>
|
|
#if HAVE_SYS_MMAN_H
|
|
# include <fcntl.h>
|
|
# include <unistd.h>
|
|
# include <sys/types.h>
|
|
# include <sys/mman.h>
|
|
# ifndef MAP_FILE
|
|
# define MAP_FILE 0
|
|
# endif
|
|
#endif
|
|
]], [[
|
|
char *fence = NULL;
|
|
#if HAVE_SYS_MMAN_H && HAVE_MPROTECT
|
|
# if HAVE_MAP_ANONYMOUS
|
|
const int flags = MAP_ANONYMOUS | MAP_PRIVATE;
|
|
const int fd = -1;
|
|
# else /* !HAVE_MAP_ANONYMOUS */
|
|
const int flags = MAP_FILE | MAP_PRIVATE;
|
|
int fd = open ("/dev/zero", O_RDONLY, 0666);
|
|
if (fd >= 0)
|
|
# endif
|
|
{
|
|
int pagesize = getpagesize ();
|
|
char *two_pages =
|
|
(char *) mmap (NULL, 2 * pagesize, PROT_READ | PROT_WRITE,
|
|
flags, fd, 0);
|
|
if (two_pages != (char *)(-1)
|
|
&& mprotect (two_pages + pagesize, pagesize, PROT_NONE) == 0)
|
|
fence = two_pages + pagesize;
|
|
}
|
|
#endif
|
|
if (fence)
|
|
{
|
|
char dest[8];
|
|
|
|
dest[0] = '*';
|
|
dest[1] = 'a';
|
|
dest[2] = '\0';
|
|
dest[3] = 'w';
|
|
dest[4] = 'x';
|
|
dest[5] = 'y';
|
|
dest[6] = 'z';
|
|
|
|
*(fence - 3) = '7';
|
|
*(fence - 2) = '2';
|
|
*(fence - 1) = '9';
|
|
|
|
if (strncat (dest + 1, fence - 3, 3) != dest + 1)
|
|
return 1;
|
|
if (dest[0] != '*')
|
|
return 2;
|
|
if (dest[1] != 'a'
|
|
|| dest[2] != '7' || dest[3] != '2' || dest[4] != '9'
|
|
|| dest[5] != '\0')
|
|
return 3;
|
|
if (dest[6] != 'z')
|
|
return 4;
|
|
}
|
|
return 0;
|
|
]])], [gl_cv_func_strncat_works=yes], [gl_cv_func_strncat_works=no],
|
|
[
|
|
case "$host_os" in
|
|
# Guess no on Solaris.
|
|
solaris*) gl_cv_func_strncat_works="guessing no";;
|
|
# Guess yes otherwise.
|
|
*) gl_cv_func_strncat_works="guessing yes";;
|
|
esac
|
|
])
|
|
])
|
|
case "$gl_cv_func_strncat_works" in
|
|
*yes) ;;
|
|
*) REPLACE_STRNCAT=1 ;;
|
|
esac
|
|
])
|
|
|
|
# Prerequisites of lib/strncat.c.
|
|
AC_DEFUN([gl_PREREQ_STRNCAT], [
|
|
:
|
|
])
|