# Autoconf macros for xdvik. # Copyright (C) 2002 Paul Vojta # Copyright (C) 2002 - 2009 Stefan Ulrich # # This file is free software; the copyright holder # gives unlimited permission to copy and/or distribute it, # with or without modifications, as long as this notice is preserved. # XDVI_FUNC_WORKING_VSNPRINTF # --------------------------- # Check for a working implementation of (v)snprintf() # which should either return a negative result or the size actually needed # (latter is C99 standard). AC_DEFUN([XDVI_FUNC_WORKING_VSNPRINTF], [AC_CACHE_CHECK([for a working implementation of (v)snprintf()], [xdvi_cv_func_good_vsnprintf], [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ #ifdef IRIX #define _XOPEN_SOURCE 500 #endif #include ]], [[char s[2]; int retval = snprintf(s, 2, "test"); if (retval > -1 && retval != 4) /* neither negative nor desired size, not OK */ return 1;]])], [xdvi_cv_func_good_vsnprintf=yes], [xdvi_cv_func_good_vsnprintf=no], [xdvi_cv_func_good_vsnprintf=no # safe value for cross-compiling])]) if test "x$xdvi_cv_func_good_vsnprintf" = xyes; then AC_DEFINE([HAVE_GOOD_VSNPRINTF], 1, [Define if the vsnprintf function works.]) fi ]) # XDVI_FUNC_WORKING_VSNPRINTF