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Diffstat (limited to 'gnulib-m4/strstr.m4')
| -rw-r--r-- | gnulib-m4/strstr.m4 | 130 |
1 files changed, 0 insertions, 130 deletions
diff --git a/gnulib-m4/strstr.m4 b/gnulib-m4/strstr.m4 deleted file mode 100644 index 040c0b9d..00000000 --- a/gnulib-m4/strstr.m4 +++ /dev/null @@ -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 |