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# strchrnul.m4 serial 10 |
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dnl Copyright (C) 2003, 2007, 2009-2023 Free Software Foundation, Inc. |
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dnl This file is free software; the Free Software Foundation |
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dnl gives unlimited permission to copy and/or distribute it, |
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dnl with or without modifications, as long as this notice is preserved. |
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AC_DEFUN([gl_FUNC_STRCHRNUL], |
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[ |
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dnl Persuade glibc <string.h> to declare strchrnul(). |
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AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) |
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AC_REQUIRE([gl_STRING_H_DEFAULTS]) |
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AC_CHECK_FUNCS([strchrnul]) |
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if test $ac_cv_func_strchrnul = no; then |
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HAVE_STRCHRNUL=0 |
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else |
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AC_CACHE_CHECK([whether strchrnul works], |
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[gl_cv_func_strchrnul_works], |
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[AC_RUN_IFELSE([AC_LANG_PROGRAM([[ |
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#include <string.h> /* for strchrnul */ |
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]], [[const char *buf = "a"; |
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return strchrnul (buf, 'b') != buf + 1; |
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]])], |
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[gl_cv_func_strchrnul_works=yes], |
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[gl_cv_func_strchrnul_works=no], |
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[dnl Cygwin 1.7.9 introduced strchrnul, but it was broken until 1.7.10 |
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AC_EGREP_CPP([Lucky user], |
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[ |
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#if defined __CYGWIN__ |
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#include <cygwin/version.h> |
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#if CYGWIN_VERSION_DLL_COMBINED > CYGWIN_VERSION_DLL_MAKE_COMBINED (1007, 9) |
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Lucky user |
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#endif |
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#else |
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Lucky user |
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#endif |
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], |
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[gl_cv_func_strchrnul_works="guessing yes"], |
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[gl_cv_func_strchrnul_works="guessing no"]) |
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]) |
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]) |
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case "$gl_cv_func_strchrnul_works" in |
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*yes) ;; |
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*) REPLACE_STRCHRNUL=1 ;; |
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esac |
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fi |
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]) |
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# Prerequisites of lib/strchrnul.c. |
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AC_DEFUN([gl_PREREQ_STRCHRNUL], [:]) |
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