kc3-lang/gnulib/m4/memmem.m4

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• Hash : 42d1eda5
  Author :
  Date : 2009-01-13T08:48:48
  

  many *.m4 files: improve m4 quoting
  
  99% of this change was performed by running the following commands:
  git ls-files | grep '\.m4$' | xargs perl -pi \
    -e 's/(AC_\w+\()([^[()]+?)([,)])/$1\[$2]$3/g;' \
    -e 's/(AC_\w+\((?:\[[^,]+?\], ){1})([^,[()]+?)([,)])/$1\[$2]$3/g;' \
    -e 's/(AC_\w+\((?:\[[^,]+?\], ){2})([^,[()]+?)([,)])/$1\[$2]$3/g;' \
    -e 's/(AC_\w+\((?:\[[^,]+?\], ){3})([^,[()]+?)([,)])/$1\[$2]$3/g'
  perl -pi -e 's/\[\.\.\.\]/.../' m4/onceonly.m4
  
  The remainder were to add Copyright dates, increment serial numbers,
  undo some changes in comments, exclude m4/intl.m4, and add quotes
  around the "1" in ",1" where the unusual spacing prohibited the
  above regexps from doing the job.  For more details, see
  <http://thread.gmane.org/gmane.comp.lib.gnulib.bugs/16175>.
  

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• m4/memmem.m4

• # memmem.m4 serial 14
  dnl Copyright (C) 2002, 2003, 2004, 2007, 2008, 2009 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 memmem is present.
  AC_DEFUN([gl_FUNC_MEMMEM_SIMPLE],
  [
    dnl Persuade glibc <string.h> to declare memmem().
    AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
  
    AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
    AC_REPLACE_FUNCS([memmem])
    AC_CHECK_DECLS_ONCE([memmem])
    if test $ac_cv_have_decl_memmem = no; then
      HAVE_DECL_MEMMEM=0
    fi
    gl_PREREQ_MEMMEM
  ]) # gl_FUNC_MEMMEM_SIMPLE
  
  dnl Additionally, check that memmem is efficient and handles empty needles.
  AC_DEFUN([gl_FUNC_MEMMEM],
  [
    AC_REQUIRE([gl_FUNC_MEMMEM_SIMPLE])
    if test $ac_cv_have_decl_memmem = yes; then
      AC_CACHE_CHECK([whether memmem works in linear time],
        [gl_cv_func_memmem_works],
        [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
  #include <signal.h> /* for signal */
  #include <string.h> /* for memmem */
  #include <stdlib.h> /* for malloc */
  #include <unistd.h> /* for alarm */
  ]], [[size_t m = 1000000;
      char *haystack = (char *) malloc (2 * m + 1);
      char *needle = (char *) malloc (m + 1);
      void *result = 0;
      /* Failure to compile this test due to missing alarm is okay,
         since all such platforms (mingw) also lack memmem.  */
      signal (SIGALRM, SIG_DFL);
      alarm (5);
      /* Check for quadratic performance.  */
      if (haystack && needle)
        {
  	memset (haystack, 'A', 2 * m);
  	haystack[2 * m] = 'B';
  	memset (needle, 'A', m);
  	needle[m] = 'B';
  	result = memmem (haystack, 2 * m + 1, needle, m + 1);
        }
      /* Check for empty needle behavior.  */
      return !result || !memmem ("a", 1, 0, 0);]])],
  	[gl_cv_func_memmem_works=yes], [gl_cv_func_memmem_works=no],
  	[dnl Only glibc >= 2.9 and cygwin >= 1.7.0 are known to have a
  	 dnl memmem that works in linear time.
  	 AC_EGREP_CPP([Lucky user],
  	   [
  #include <features.h>
  #ifdef __GNU_LIBRARY__
   #if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 9) || (__GLIBC__ > 2)
    Lucky user
   #endif
  #endif
  #ifdef __CYGWIN__
   #include <cygwin/version.h>
   #if CYGWIN_VERSION_DLL_MAJOR >= 1007
    Lucky user
   #endif
  #endif
  	   ],
  	   [gl_cv_func_memmem_works=yes],
  	   [gl_cv_func_memmem_works="guessing no"])
  	])
        ])
      if test "$gl_cv_func_memmem_works" != yes; then
        REPLACE_MEMMEM=1
        AC_LIBOBJ([memmem])
      fi
    fi
  ]) # gl_FUNC_MEMMEM
  
  # Prerequisites of lib/memmem.c.
  AC_DEFUN([gl_PREREQ_MEMMEM], [:])
  

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