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ax_func_snprintf.m4
# =========================================================================== # https://www.gnu.org/software/autoconf-archive/ax_func_snprintf.html # =========================================================================== # # SYNOPSIS # # AX_FUNC_SNPRINTF # # DESCRIPTION # # Checks for a fully C99 compliant snprintf, in particular checks whether # it does bounds checking and returns the correct string length; does the # same check for vsnprintf. If no working snprintf or vsnprintf is found, # request a replacement and warn the user about it. Note: the mentioned # replacement is freely available and may be used in any project # regardless of it's license. # # LICENSE # # Copyright (c) 2008 Ruediger Kuhlmann <info@ruediger-kuhlmann.de> # # Copying and distribution of this file, with or without modification, are # permitted in any medium without royalty provided the copyright notice # and this notice are preserved. This file is offered as-is, without any # warranty. #serial 6 AU_ALIAS([AC_FUNC_SNPRINTF], [AX_FUNC_SNPRINTF]) AC_DEFUN([AX_FUNC_SNPRINTF], [AC_CHECK_FUNCS(snprintf vsnprintf) AC_MSG_CHECKING(for working snprintf) AC_CACHE_VAL(ac_cv_have_working_snprintf, [AC_TRY_RUN( [#include <stdio.h> int main(void) { char bufs[5] = { 'x', 'x', 'x', '\0', '\0' }; char bufd[5] = { 'x', 'x', 'x', '\0', '\0' }; int i; i = snprintf (bufs, 2, "%s", "111"); if (strcmp (bufs, "1")) exit (1); if (i != 3) exit (1); i = snprintf (bufd, 2, "%d", 111); if (strcmp (bufd, "1")) exit (1); if (i != 3) exit (1); exit(0); }], ac_cv_have_working_snprintf=yes, ac_cv_have_working_snprintf=no, ac_cv_have_working_snprintf=cross)]) AC_MSG_RESULT([$ac_cv_have_working_snprintf]) AC_MSG_CHECKING(for working vsnprintf) AC_CACHE_VAL(ac_cv_have_working_vsnprintf, [AC_TRY_RUN( [#include <stdio.h> #include <stdarg.h> int my_vsnprintf (char *buf, const char *tmpl, ...) { int i; va_list args; va_start (args, tmpl); i = vsnprintf (buf, 2, tmpl, args); va_end (args); return i; } int main(void) { char bufs[5] = { 'x', 'x', 'x', '\0', '\0' }; char bufd[5] = { 'x', 'x', 'x', '\0', '\0' }; int i; i = my_vsnprintf (bufs, "%s", "111"); if (strcmp (bufs, "1")) exit (1); if (i != 3) exit (1); i = my_vsnprintf (bufd, "%d", 111); if (strcmp (bufd, "1")) exit (1); if (i != 3) exit (1); exit(0); }], ac_cv_have_working_vsnprintf=yes, ac_cv_have_working_vsnprintf=no, ac_cv_have_working_vsnprintf=cross)]) AC_MSG_RESULT([$ac_cv_have_working_vsnprintf]) if test x$ac_cv_have_working_snprintf$ac_cv_have_working_vsnprintf != "xyesyes"; then AC_LIBOBJ(snprintf) AC_MSG_WARN([Replacing missing/broken (v)snprintf() with version from http://www.ijs.si/software/snprintf/.]) AC_DEFINE(PREFER_PORTABLE_SNPRINTF, 1, "enable replacement (v)snprintf if system (v)snprintf is broken") fi])