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-rw-r--r--gnulib-m4/strstr.m4130
1 files changed, 0 insertions, 130 deletions
diff --git a/gnulib-m4/strstr.m4 b/gnulib-m4/strstr.m4
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--- a/gnulib-m4/strstr.m4
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@@ -1,130 +0,0 @@
-# strstr.m4 serial 16
-dnl Copyright (C) 2008-2015 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 "$gl_cv_func_memchr_works" != yes; then
- REPLACE_STRSTR=1
- else
- dnl Detect http://sourceware.org/bugzilla/show_bug.cgi?id=12092.
- AC_CACHE_CHECK([whether strstr works],
- [gl_cv_func_strstr_works_always],
- [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
-#include <string.h> /* for strstr */
-#define P "_EF_BF_BD"
-#define HAYSTACK "F_BD_CE_BD" P P P P "_C3_88_20" P P P "_C3_A7_20" P
-#define NEEDLE P P P P P
-]], [[return !!strstr (HAYSTACK, NEEDLE);
- ]])],
- [gl_cv_func_strstr_works_always=yes],
- [gl_cv_func_strstr_works_always=no],
- [dnl glibc 2.12 and cygwin 1.7.7 have a known bug. uClibc is not
- dnl affected, since it uses different source code for strstr than
- dnl glibc.
- dnl Assume that it works on all other platforms, even if it is not
- dnl linear.
- AC_EGREP_CPP([Lucky user],
- [
-#ifdef __GNU_LIBRARY__
- #include <features.h>
- #if ((__GLIBC__ == 2 && __GLIBC_MINOR__ > 12) || (__GLIBC__ > 2)) \
- || defined __UCLIBC__
- Lucky user
- #endif
-#elif defined __CYGWIN__
- #include <cygwin/version.h>
- #if CYGWIN_VERSION_DLL_COMBINED > CYGWIN_VERSION_DLL_MAKE_COMBINED (1007, 7)
- Lucky user
- #endif
-#else
- Lucky user
-#endif
- ],
- [gl_cv_func_strstr_works_always="guessing yes"],
- [gl_cv_func_strstr_works_always="guessing no"])
- ])
- ])
- case "$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 $REPLACE_STRSTR = 0; then
- AC_CACHE_CHECK([whether strstr works in linear time],
- [gl_cv_func_strstr_linear],
- [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
-#include <signal.h> /* for signal */
-#include <string.h> /* for strstr */
-#include <stdlib.h> /* for malloc */
-#include <unistd.h> /* for alarm */
-static void quit (int sig) { exit (sig + 128); }
-]], [[
- int result = 0;
- size_t m = 1000000;
- char *haystack = (char *) malloc (2 * m + 2);
- char *needle = (char *) malloc (m + 2);
- /* Failure to compile this test due to missing alarm is okay,
- since all such platforms (mingw) also have quadratic strstr. */
- signal (SIGALRM, quit);
- alarm (5);
- /* Check for quadratic performance. */
- if (haystack && needle)
- {
- memset (haystack, 'A', 2 * m);
- haystack[2 * m] = 'B';
- haystack[2 * m + 1] = 0;
- memset (needle, 'A', m);
- needle[m] = 'B';
- needle[m + 1] = 0;
- if (!strstr (haystack, needle))
- result |= 1;
- }
- return result;
- ]])],
- [gl_cv_func_strstr_linear=yes], [gl_cv_func_strstr_linear=no],
- [dnl Only glibc > 2.12 on processors without SSE 4.2 instructions and
- dnl cygwin > 1.7.7 are known to have a bug-free strstr that works in
- dnl linear time.
- AC_EGREP_CPP([Lucky user],
- [
-#include <features.h>
-#ifdef __GNU_LIBRARY__
- #if ((__GLIBC__ == 2 && __GLIBC_MINOR__ > 12) || (__GLIBC__ > 2)) \
- && !(defined __i386__ || defined __x86_64__) \
- && !defined __UCLIBC__
- Lucky user
- #endif
-#endif
-#ifdef __CYGWIN__
- #include <cygwin/version.h>
- #if CYGWIN_VERSION_DLL_COMBINED > CYGWIN_VERSION_DLL_MAKE_COMBINED (1007, 7)
- Lucky user
- #endif
-#endif
- ],
- [gl_cv_func_strstr_linear="guessing yes"],
- [gl_cv_func_strstr_linear="guessing no"])
- ])
- ])
- case "$gl_cv_func_strstr_linear" in
- *yes) ;;
- *)
- REPLACE_STRSTR=1
- ;;
- esac
- fi
-]) # gl_FUNC_STRSTR