AC_DEFUN([gl_FUNC_STRNDUP],
[
AC_REQUIRE([AC_GNU_SOURCE])
AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
AC_CHECK_DECLS_ONCE([strndup])
if test $ac_cv_have_decl_strndup = no; then
HAVE_DECL_STRNDUP=0
fi
AC_CACHE_CHECK([for working strndup], gl_cv_func_strndup,
[AC_RUN_IFELSE([
AC_LANG_PROGRAM([ extern char *strndup (const char *, size_t);
char *s;
s = strndup ("some longer string", 15);
free (s);
s = strndup ("shorter string", 13);
return s[13] != '\0';]])],
[gl_cv_func_strndup=yes],
[gl_cv_func_strndup=no],
[AC_CHECK_FUNC([strndup],
[AC_EGREP_CPP([too risky], [
too risky
],
[gl_cv_func_strndup=no],
[gl_cv_func_strndup=yes])],
[gl_cv_func_strndup=no])])])
if test $gl_cv_func_strndup = yes; then
AC_DEFINE([HAVE_STRNDUP], 1,
[Define if you have the strndup() function and it works.])
else
HAVE_STRNDUP=0
AC_LIBOBJ([strndup])
gl_PREREQ_STRNDUP
fi
])
AC_DEFUN([gl_PREREQ_STRNDUP], [:])