| # strchrnul.m4 serial 9 |
| dnl Copyright (C) 2003, 2007, 2009-2021 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. |
| |
| AC_DEFUN([gl_FUNC_STRCHRNUL], |
| [ |
| dnl Persuade glibc <string.h> to declare strchrnul(). |
| AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) |
| |
| AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS]) |
| AC_CHECK_FUNCS([strchrnul]) |
| if test $ac_cv_func_strchrnul = no; then |
| HAVE_STRCHRNUL=0 |
| else |
| AC_CACHE_CHECK([whether strchrnul works], |
| [gl_cv_func_strchrnul_works], |
| [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ |
| #include <string.h> /* for strchrnul */ |
| ]], [[const char *buf = "a"; |
| return strchrnul (buf, 'b') != buf + 1; |
| ]])], |
| [gl_cv_func_strchrnul_works=yes], |
| [gl_cv_func_strchrnul_works=no], |
| [dnl Cygwin 1.7.9 introduced strchrnul, but it was broken until 1.7.10 |
| AC_EGREP_CPP([Lucky user], |
| [ |
| #if defined __CYGWIN__ |
| #include <cygwin/version.h> |
| #if CYGWIN_VERSION_DLL_COMBINED > CYGWIN_VERSION_DLL_MAKE_COMBINED (1007, 9) |
| Lucky user |
| #endif |
| #else |
| Lucky user |
| #endif |
| ], |
| [gl_cv_func_strchrnul_works="guessing yes"], |
| [gl_cv_func_strchrnul_works="guessing no"]) |
| ]) |
| ]) |
| case "$gl_cv_func_strchrnul_works" in |
| *yes) ;; |
| *) REPLACE_STRCHRNUL=1 ;; |
| esac |
| fi |
| ]) |
| |
| # Prerequisites of lib/strchrnul.c. |
| AC_DEFUN([gl_PREREQ_STRCHRNUL], [:]) |