-# vasnprintf.m4 serial 29
-dnl Copyright (C) 2002-2004, 2006-2010 Free Software Foundation, Inc.
+# vasnprintf.m4 serial 36
+dnl Copyright (C) 2002-2004, 2006-2013 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.
gl_PREREQ_ASNPRINTF
])
-# Prequisites of lib/printf-args.h, lib/printf-args.c.
+# Prerequisites of lib/printf-args.h, lib/printf-args.c.
AC_DEFUN([gl_PREREQ_PRINTF_ARGS],
[
AC_REQUIRE([AC_TYPE_LONG_LONG_INT])
AC_REQUIRE([gt_TYPE_WINT_T])
])
-# Prequisites of lib/printf-parse.h, lib/printf-parse.c.
+# Prerequisites of lib/printf-parse.h, lib/printf-parse.c.
AC_DEFUN([gl_PREREQ_PRINTF_PARSE],
[
+ AC_REQUIRE([gl_FEATURES_H])
AC_REQUIRE([AC_TYPE_LONG_LONG_INT])
AC_REQUIRE([gt_TYPE_WCHAR_T])
AC_REQUIRE([gt_TYPE_WINT_T])
AC_CHECK_FUNCS([snprintf strnlen wcslen wcsnlen mbrtowc wcrtomb])
dnl Use the _snprintf function only if it is declared (because on NetBSD it
dnl is defined as a weak alias of snprintf; we prefer to use the latter).
- AC_CHECK_DECLS([_snprintf], , , [#include <stdio.h>])
+ AC_CHECK_DECLS([_snprintf], , , [[#include <stdio.h>]])
+ dnl Knowing DBL_EXPBIT0_WORD and DBL_EXPBIT0_BIT enables an optimization
+ dnl in the code for NEED_PRINTF_LONG_DOUBLE || NEED_PRINTF_DOUBLE.
+ AC_REQUIRE([gl_DOUBLE_EXPONENT_LOCATION])
+ dnl We can avoid a lot of code by assuming that snprintf's return value
+ dnl conforms to ISO C99. So check that.
+ AC_REQUIRE([gl_SNPRINTF_RETVAL_C99])
+ case "$gl_cv_func_snprintf_retval_c99" in
+ *yes)
+ AC_DEFINE([HAVE_SNPRINTF_RETVAL_C99], [1],
+ [Define if the return value of the snprintf function is the number of
+ of bytes (excluding the terminating NUL) that would have been produced
+ if the buffer had been large enough.])
+ ;;
+ esac
])
# Extra prerequisites of lib/vasnprintf.c for supporting 'long double'