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-rw-r--r--m4/strchrnul.m453
1 files changed, 53 insertions, 0 deletions
diff --git a/m4/strchrnul.m4 b/m4/strchrnul.m4
new file mode 100644
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+++ b/m4/strchrnul.m4
@@ -0,0 +1,53 @@
+# strchrnul.m4 serial 12
+dnl Copyright (C) 2003, 2007, 2009-2023 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_STRING_H_DEFAULTS])
+ gl_CHECK_FUNCS_ANDROID([strchrnul], [[#include <string.h>]])
+ if test $ac_cv_func_strchrnul = no; then
+ HAVE_STRCHRNUL=0
+ case "$gl_cv_onwards_func_strchrnul" in
+ future*) REPLACE_STRCHRNUL=1 ;;
+ esac
+ 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], [:])