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# $Id: snprintf.m4,v 1.1.1.1 2008/01/06 03:24:00 holger Exp $
# Copyright (c) 2008 Holger Weiss <holger@jhweiss.de>.
#
# This code may freely be used, modified and/or redistributed for any purpose.
# It would be nice if additions and fixes to this file (including trivial code
# cleanups) would be sent back in order to let me include them in the version
# available at <http://www.jhweiss.de/software/snprintf.html>. However, this is
# not a requirement for using or redistributing (possibly modified) versions of
# this file, nor is leaving this notice intact mandatory.
# HW_HEADER_STDARG_H
# ------------------
# Define HAVE_STDARG_H to 1 if <stdarg.h> is available.
AC_DEFUN([HW_HEADER_STDARG_H],
[
AC_CHECK_HEADERS([stdarg.h])
])# HW_HEADER_STDARG_H
# HW_HEADER_VARARGS_H
# -------------------
# Define HAVE_VARARGS_H to 1 if <varargs.h> is available.
AC_DEFUN([HW_HEADER_VARARGS_H],
[
AC_CHECK_HEADERS([varargs.h])
])# HW_HEADER_VARARGS_H
# HW_FUNC_VA_COPY
# ---------------
# Set $hw_cv_func_va_copy to "yes" or "no". Define HAVE_VA_COPY to 1 if
# $hw_cv_func_va_copy is set to "yes". Note that it's "unspecified whether
# va_copy and va_end are macros or identifiers declared with external linkage."
# (C99: 7.15.1, 1) Therefore, the presence of va_copy(3) cannot simply "be
# tested with #ifdef", as suggested by the Autoconf manual (5.5.1).
AC_DEFUN([HW_FUNC_VA_COPY],
[
AC_REQUIRE([HW_HEADER_STDARG_H])dnl Our check evaluates HAVE_STDARG_H.
AC_REQUIRE([HW_HEADER_VARARGS_H])dnl Our check evaluates HAVE_VARARGS_H.
AC_CACHE_CHECK([for va_copy],
[hw_cv_func_va_copy],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[[#if HAVE_STDARG_H
#include <stdarg.h>
#elif HAVE_VARARGS_H
#include <varargs.h>
#endif]],
[[va_list ap, aq; va_copy(aq, ap);]])],
[hw_cv_func_va_copy=yes],
[hw_cv_func_va_copy=no],
[hw_cv_func_va_copy=no])])
AS_IF([test "$hw_cv_func_va_copy" = yes],
[AC_DEFINE([HAVE_VA_COPY], [1],
[Define to 1 if you have the `va_copy' function or macro.])])
])# HW_FUNC_VA_COPY
# HW_FUNC___VA_COPY
# -----------------
# Set $hw_cv_func___va_copy to "yes" or "no". Define HAVE___VA_COPY to 1 if
# $hw_cv_func___va_copy is set to "yes".
AC_DEFUN([HW_FUNC___VA_COPY],
[
AC_REQUIRE([HW_HEADER_STDARG_H])dnl Our check evaluates HAVE_STDARG_H.
AC_REQUIRE([HW_HEADER_VARARGS_H])dnl Our check evaluates HAVE_VARARGS_H.
AC_CACHE_CHECK([for __va_copy],
[hw_cv_func___va_copy],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[[#if HAVE_STDARG_H
#include <stdarg.h>
#elif HAVE_VARARGS_H
#include <varargs.h>
#endif]],
[[va_list ap, aq; __va_copy(aq, ap);]])],
[hw_cv_func___va_copy=yes],
[hw_cv_func___va_copy=no],
[hw_cv_func___va_copy=no])])
AS_IF([test "$hw_cv_func___va_copy" = yes],
[AC_DEFINE([HAVE___VA_COPY], [1],
[Define to 1 if you have the `__va_copy' function or macro.])])
])# HW_FUNC___VA_COPY
# HW_FUNC_VSNPRINTF
# -----------------
# Set $hw_cv_func_vsnprintf and $hw_cv_func_vsnprintf_c99 to "yes" or "no",
# respectively. Define HAVE_VSNPRINTF to 1 only if $hw_cv_func_vsnprintf_c99
# is set to "yes". Otherwise, define vsnprintf to rpl_vsnprintf and make sure
# the replacement function will be built.
AC_DEFUN([HW_FUNC_VSNPRINTF],
[
AC_REQUIRE([HW_HEADER_STDARG_H])dnl Our check evaluates HAVE_STDARG_H.
dnl The following checks are not *required* to HAVE_VSNPRINTF, but they
dnl should be checked (and pass!) for the test in snprintf.c to pass.
AC_CHECK_HEADERS([inttypes.h locale.h stddef.h stdint.h])
AC_CHECK_MEMBERS([struct lconv.decimal_point, struct lconv.thousands_sep],
[], [], [#include <locale.h>])
AC_TYPE_LONG_DOUBLE
AC_TYPE_LONG_LONG_INT
AC_TYPE_UNSIGNED_LONG_LONG_INT
AC_TYPE_SIZE_T
AC_TYPE_INTMAX_T
AC_TYPE_UINTMAX_T
AC_TYPE_UINTPTR_T
AC_CHECK_TYPES([ptrdiff_t])
AC_CHECK_FUNCS([localeconv])
AC_CHECK_FUNC([vsnprintf],
[hw_cv_func_vsnprintf=yes],
[hw_cv_func_vsnprintf=no])
AS_IF([test "$hw_cv_func_vsnprintf" = yes],
[AC_CACHE_CHECK([whether vsnprintf is C99 compliant],
[hw_cv_func_vsnprintf_c99],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[[#if HAVE_STDARG_H
#include <stdarg.h>
#endif
#include <stdio.h>
static int testprintf(char *buf, size_t size, const char *format, ...)
{
int result;
va_list ap;
va_start(ap, format);
result = vsnprintf(buf, size, format, ap);
va_end(ap);
return result;
}]],
[[char buf[43];
if (testprintf(buf, 4, "The answer is %27.2g.", 42.0) != 42 ||
testprintf(buf, 0, "No, it's %32zu.", (size_t)42) != 42 ||
buf[0] != 'T' || buf[3] != '\0' ||
testprintf(NULL, 0, "") != 0 || /* POSSIBLE SEGFAULT ON NON-C99 LIBCs!!! */
testprintf(NULL, 0, "Some actual %18s formatting.\nblah %d.\n", "42", 1) != 51)
return 1;]])],
[hw_cv_func_vsnprintf_c99=yes],
[hw_cv_func_vsnprintf_c99=no],
[hw_cv_func_vsnprintf_c99=no])])],
[hw_cv_func_snprintf_c99=no])
AS_IF(
[test "$hw_cv_func_vsnprintf_c99" = yes],
[AC_DEFINE([HAVE_VSNPRINTF], [1],
[Define to 1 if you have a C99 compliant `vsnprintf' function.])],
[
AC_DEFINE([vsnprintf], [rpl_vsnprintf],
[Define to rpl_vsnprintf if the replacement function should be used.])
AC_DEFINE([vprintf], [rpl_vprintf],
[Define to rpl_vprintf if the replacement function should be used.])
AC_DEFINE([vfprintf], [rpl_vfprintf],
[Define to rpl_vfprintf if the replacement function should be used.])
_HW_FUNC_XPRINTF_REPLACE
])
])# HW_FUNC_VSNPRINTF
# HW_FUNC_SNPRINTF
# ----------------
# Set $hw_cv_func_snprintf and $hw_cv_func_snprintf_c99 to "yes" or "no",
# respectively. Define HAVE_SNPRINTF to 1 only if $hw_cv_func_snprintf_c99
# is set to "yes". Otherwise, define snprintf to rpl_snprintf and make sure
# the replacement function will be built.
AC_DEFUN([HW_FUNC_SNPRINTF],
[
AC_REQUIRE([HW_FUNC_VSNPRINTF])dnl Our snprintf(3) calls vsnprintf(3).
AC_CHECK_FUNC([snprintf],
[hw_cv_func_snprintf=yes],
[hw_cv_func_snprintf=no])
AS_IF([test "$hw_cv_func_snprintf" = yes],
[AC_CACHE_CHECK([whether snprintf is C99 compliant],
[hw_cv_func_snprintf_c99],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM([[#include <stdio.h>]],
[[char buf[43];
if (snprintf(buf, 4, "The answer is %27.2g.", 42.0) != 42 ||
snprintf(buf, 0, "No, it's %32zu.", (size_t)42) != 42 ||
buf[0] != 'T' || buf[3] != '\0' ||
snprintf(NULL, 0, "") != 0 || /* POSSIBLE SEGFAULT ON NON-C99 LIBCs!!! */
snprintf(NULL, 0, "Some actual %18s formatting.\nblah %d.\n", "42", 1) != 51)
return 1;]])],
[hw_cv_func_snprintf_c99=yes],
[hw_cv_func_snprintf_c99=no],
[hw_cv_func_snprintf_c99=no])])],
[hw_cv_func_snprintf_c99=no])
AS_IF(
[test "$hw_cv_func_snprintf_c99" = yes],
[AC_DEFINE([HAVE_SNPRINTF], [1],
[Define to 1 if you have a C99 compliant `snprintf' function.])],
[
AC_DEFINE([snprintf], [rpl_snprintf],
[Define to rpl_snprintf if the replacement function should be used.])
AC_DEFINE([printf], [rpl_printf],
[Define to rpl_printf if the replacement function should be used.])
AC_DEFINE([fprintf], [rpl_fprintf],
[Define to rpl_fprintf if the replacement function should be used.])
_HW_FUNC_XPRINTF_REPLACE
])
])# HW_FUNC_SNPRINTF
# HW_FUNC_VASPRINTF
# -----------------
# Set $hw_cv_func_vasprintf to "yes" or "no". Define HAVE_VASPRINTF to 1 if
# $hw_cv_func_vasprintf is set to "yes". Otherwise, define vasprintf to
# rpl_vasprintf and make sure the replacement function will be built.
AC_DEFUN([HW_FUNC_VASPRINTF],
[
AC_REQUIRE([HW_FUNC_VSNPRINTF])dnl Our vasprintf(3) calls vsnprintf(3).
# Don't even bother checking for vasprintf if snprintf was standards
# incompliant, this one is going to be too.
AS_IF([test "$hw_cv_func_snprintf_c99" = yes],
[AC_CHECK_FUNCS([vasprintf],
[hw_cv_func_vasprintf=yes],
[hw_cv_func_vasprintf=no])
],
[hw_cv_func_vasprintf=no])
AS_IF([test "$hw_cv_func_vasprintf" = no],
[AC_DEFINE([vasprintf], [rpl_vasprintf],
[Define to rpl_vasprintf if the replacement function should be used.])
AC_CHECK_HEADERS([stdlib.h])
HW_FUNC_VA_COPY
AS_IF([test "$hw_cv_func_va_copy" = no],
[HW_FUNC___VA_COPY])
_HW_FUNC_XPRINTF_REPLACE])
])# HW_FUNC_VASPRINTF
# HW_FUNC_ASPRINTF
# ----------------
# Set $hw_cv_func_asprintf to "yes" or "no". Define HAVE_ASPRINTF to 1 if
# $hw_cv_func_asprintf is set to "yes". Otherwise, define asprintf to
# rpl_asprintf and make sure the replacement function will be built.
AC_DEFUN([HW_FUNC_ASPRINTF],
[
AC_REQUIRE([HW_FUNC_VASPRINTF])dnl Our asprintf(3) calls vasprintf(3).
# Don't even bother checking for asprintf if snprintf was standards
# incompliant, this one is going to be too.
AS_IF([test "$hw_cv_func_snprintf_c99" = yes],
[AC_CHECK_FUNCS([asprintf],
[hw_cv_func_asprintf=yes],
[hw_cv_func_asprintf=no])
],
[hw_cv_func_asprintf=no])
AS_IF([test "$hw_cv_func_asprintf" = no],
[AC_DEFINE([asprintf], [rpl_asprintf],
[Define to rpl_asprintf if the replacement function should be used.])
_HW_FUNC_XPRINTF_REPLACE])
])# HW_FUNC_ASPRINTF
# _HW_FUNC_XPRINTF_REPLACE
# ------------------------
# Arrange for building snprintf.c. Must be called if one or more of the
# functions provided by snprintf.c are needed.
# XXX: We provide an empty version of this macro because building snprintf.c is
# taken care of in libntech/libutils and its libcompat not in libcfecompat.
AC_DEFUN([_HW_FUNC_XPRINTF_REPLACE],
[
])# _HW_FUNC_XPRINTF_REPLACE
dnl vim: set joinspaces textwidth=80:
|
