mirror of
https://git.zap.org.au/git/trader.git
synced 2024-12-04 14:46:45 -05:00
2dc2bfb9bf
These files have been created by running ./build-aux/bootstrap with Gnulib as at commit d93b573ba772a334a83dac971c3004f1fed8a8a5 (with a date stamp of Wed Aug 23 14:45:58 2017 -0700), Autoconf 2.69, Automake 1.15.1, Gettext 0.19.8.1 and pkg-config 0.29.
140 lines
4.3 KiB
Plaintext
140 lines
4.3 KiB
Plaintext
# strstr.m4 serial 19
|
|
dnl Copyright (C) 2008-2017 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.
|
|
|
|
dnl Check that strstr works.
|
|
AC_DEFUN([gl_FUNC_STRSTR_SIMPLE],
|
|
[
|
|
AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
|
|
AC_REQUIRE([gl_FUNC_MEMCHR])
|
|
if test $HAVE_MEMCHR = 0 || test $REPLACE_MEMCHR = 1; then
|
|
REPLACE_STRSTR=1
|
|
else
|
|
dnl Detect http://sourceware.org/bugzilla/show_bug.cgi?id=12092.
|
|
AC_CACHE_CHECK([whether strstr works],
|
|
[gl_cv_func_strstr_works_always],
|
|
[AC_RUN_IFELSE([AC_LANG_PROGRAM([[
|
|
#include <string.h> /* for strstr */
|
|
#define P "_EF_BF_BD"
|
|
#define HAYSTACK "F_BD_CE_BD" P P P P "_C3_88_20" P P P "_C3_A7_20" P
|
|
#define NEEDLE P P P P P
|
|
]], [[return !!strstr (HAYSTACK, NEEDLE);
|
|
]])],
|
|
[gl_cv_func_strstr_works_always=yes],
|
|
[gl_cv_func_strstr_works_always=no],
|
|
[dnl glibc 2.12 and cygwin 1.7.7 have a known bug. uClibc is not
|
|
dnl affected, since it uses different source code for strstr than
|
|
dnl glibc.
|
|
dnl Assume that it works on all other platforms, even if it is not
|
|
dnl linear.
|
|
AC_EGREP_CPP([Lucky user],
|
|
[
|
|
#ifdef __GNU_LIBRARY__
|
|
#include <features.h>
|
|
#if ((__GLIBC__ == 2 && __GLIBC_MINOR__ > 12) || (__GLIBC__ > 2)) \
|
|
|| defined __UCLIBC__
|
|
Lucky user
|
|
#endif
|
|
#elif defined __CYGWIN__
|
|
#include <cygwin/version.h>
|
|
#if CYGWIN_VERSION_DLL_COMBINED > CYGWIN_VERSION_DLL_MAKE_COMBINED (1007, 7)
|
|
Lucky user
|
|
#endif
|
|
#else
|
|
Lucky user
|
|
#endif
|
|
],
|
|
[gl_cv_func_strstr_works_always="guessing yes"],
|
|
[gl_cv_func_strstr_works_always="guessing no"])
|
|
])
|
|
])
|
|
case "$gl_cv_func_strstr_works_always" in
|
|
*yes) ;;
|
|
*)
|
|
REPLACE_STRSTR=1
|
|
;;
|
|
esac
|
|
fi
|
|
]) # gl_FUNC_STRSTR_SIMPLE
|
|
|
|
dnl Additionally, check that strstr is efficient.
|
|
AC_DEFUN([gl_FUNC_STRSTR],
|
|
[
|
|
AC_REQUIRE([gl_FUNC_STRSTR_SIMPLE])
|
|
if test $REPLACE_STRSTR = 0; then
|
|
AC_CACHE_CHECK([whether strstr works in linear time],
|
|
[gl_cv_func_strstr_linear],
|
|
[AC_RUN_IFELSE([AC_LANG_PROGRAM([[
|
|
#ifdef __MVS__
|
|
/* z/OS does not deliver signals while strstr() is running (thanks to
|
|
restrictions on its LE runtime), which prevents us from limiting the
|
|
running time of this test. */
|
|
# error "This test does not work properly on z/OS"
|
|
#endif
|
|
#include <signal.h> /* for signal */
|
|
#include <string.h> /* for strstr */
|
|
#include <stdlib.h> /* for malloc */
|
|
#include <unistd.h> /* for alarm */
|
|
static void quit (int sig) { _exit (sig + 128); }
|
|
]], [[
|
|
int result = 0;
|
|
size_t m = 1000000;
|
|
char *haystack = (char *) malloc (2 * m + 2);
|
|
char *needle = (char *) malloc (m + 2);
|
|
/* Failure to compile this test due to missing alarm is okay,
|
|
since all such platforms (mingw) also have quadratic strstr. */
|
|
signal (SIGALRM, quit);
|
|
alarm (5);
|
|
/* Check for quadratic performance. */
|
|
if (haystack && needle)
|
|
{
|
|
memset (haystack, 'A', 2 * m);
|
|
haystack[2 * m] = 'B';
|
|
haystack[2 * m + 1] = 0;
|
|
memset (needle, 'A', m);
|
|
needle[m] = 'B';
|
|
needle[m + 1] = 0;
|
|
if (!strstr (haystack, needle))
|
|
result |= 1;
|
|
}
|
|
/* Free allocated memory, in case some sanitizer is watching. */
|
|
free (haystack);
|
|
free (needle);
|
|
return result;
|
|
]])],
|
|
[gl_cv_func_strstr_linear=yes], [gl_cv_func_strstr_linear=no],
|
|
[dnl Only glibc > 2.12 on processors without SSE 4.2 instructions and
|
|
dnl cygwin > 1.7.7 are known to have a bug-free strstr that works in
|
|
dnl linear time.
|
|
AC_EGREP_CPP([Lucky user],
|
|
[
|
|
#include <features.h>
|
|
#ifdef __GNU_LIBRARY__
|
|
#if ((__GLIBC__ == 2 && __GLIBC_MINOR__ > 12) || (__GLIBC__ > 2)) \
|
|
&& !(defined __i386__ || defined __x86_64__) \
|
|
&& !defined __UCLIBC__
|
|
Lucky user
|
|
#endif
|
|
#endif
|
|
#ifdef __CYGWIN__
|
|
#include <cygwin/version.h>
|
|
#if CYGWIN_VERSION_DLL_COMBINED > CYGWIN_VERSION_DLL_MAKE_COMBINED (1007, 7)
|
|
Lucky user
|
|
#endif
|
|
#endif
|
|
],
|
|
[gl_cv_func_strstr_linear="guessing yes"],
|
|
[gl_cv_func_strstr_linear="guessing no"])
|
|
])
|
|
])
|
|
case "$gl_cv_func_strstr_linear" in
|
|
*yes) ;;
|
|
*)
|
|
REPLACE_STRSTR=1
|
|
;;
|
|
esac
|
|
fi
|
|
]) # gl_FUNC_STRSTR
|