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Annotation of embedaddon/sudo/m4/ax_func_snprintf.m4, revision 1.1

1.1     ! misho       1: # ===========================================================================
        !             2: #     http://www.gnu.org/software/autoconf-archive/ax_func_snprintf.html
        !             3: # ===========================================================================
        !             4: #
        !             5: # SYNOPSIS
        !             6: #
        !             7: #   AX_FUNC_SNPRINTF
        !             8: #
        !             9: # DESCRIPTION
        !            10: #
        !            11: #   Checks for a fully C99 compliant snprintf, in particular checks whether
        !            12: #   it does bounds checking and returns the correct string length; does the
        !            13: #   same check for vsnprintf. If no working snprintf or vsnprintf is found,
        !            14: #   request a replacement and warn the user about it. Note: the mentioned
        !            15: #   replacement is freely available and may be used in any project
        !            16: #   regardless of it's license.
        !            17: #
        !            18: # LICENSE
        !            19: #
        !            20: #   Copyright (c) 2008 Ruediger Kuhlmann <info@ruediger-kuhlmann.de>
        !            21: #
        !            22: #   Copying and distribution of this file, with or without modification, are
        !            23: #   permitted in any medium without royalty provided the copyright notice
        !            24: #   and this notice are preserved. This file is offered as-is, without any
        !            25: #   warranty.
        !            26: 
        !            27: #serial 5
        !            28: 
        !            29: AC_DEFUN([AX_FUNC_SNPRINTF],
        !            30: [AC_CHECK_FUNCS(snprintf vsnprintf)
        !            31: AC_MSG_CHECKING(for working snprintf)
        !            32: AC_CACHE_VAL(ac_cv_have_working_snprintf,
        !            33: [AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <stdio.h>
        !            34: 
        !            35: int main(void)
        !            36: {
        !            37:     char bufs[5] = { 'x', 'x', 'x', '\0', '\0' };
        !            38:     char bufd[5] = { 'x', 'x', 'x', '\0', '\0' };
        !            39:     int i;
        !            40:     i = snprintf (bufs, 2, "%s", "111");
        !            41:     if (strcmp (bufs, "1")) exit (1);
        !            42:     if (i != 3) exit (1);
        !            43:     i = snprintf (bufd, 2, "%d", 111);
        !            44:     if (strcmp (bufd, "1")) exit (1);
        !            45:     if (i != 3) exit (1);
        !            46:     exit(0);
        !            47: }]])],[ac_cv_have_working_snprintf=yes],[ac_cv_have_working_snprintf=no],[ac_cv_have_working_snprintf=cross])])
        !            48: AC_MSG_RESULT([$ac_cv_have_working_snprintf])
        !            49: AC_MSG_CHECKING(for working vsnprintf)
        !            50: AC_CACHE_VAL(ac_cv_have_working_vsnprintf,
        !            51: [AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <stdio.h>
        !            52: #include <stdarg.h>
        !            53: 
        !            54: int my_vsnprintf (char *buf, const char *tmpl, ...)
        !            55: {
        !            56:     int i;
        !            57:     va_list args;
        !            58:     va_start (args, tmpl);
        !            59:     i = vsnprintf (buf, 2, tmpl, args);
        !            60:     va_end (args);
        !            61:     return i;
        !            62: }
        !            63: 
        !            64: int main(void)
        !            65: {
        !            66:     char bufs[5] = { 'x', 'x', 'x', '\0', '\0' };
        !            67:     char bufd[5] = { 'x', 'x', 'x', '\0', '\0' };
        !            68:     int i;
        !            69:     i = my_vsnprintf (bufs, "%s", "111");
        !            70:     if (strcmp (bufs, "1")) exit (1);
        !            71:     if (i != 3) exit (1);
        !            72:     i = my_vsnprintf (bufd, "%d", 111);
        !            73:     if (strcmp (bufd, "1")) exit (1);
        !            74:     if (i != 3) exit (1);
        !            75:     exit(0);
        !            76: }]])],[ac_cv_have_working_vsnprintf=yes],[ac_cv_have_working_vsnprintf=no],[ac_cv_have_working_vsnprintf=cross])])
        !            77: AC_MSG_RESULT([$ac_cv_have_working_vsnprintf])
        !            78: if test x$ac_cv_have_working_snprintf$ac_cv_have_working_vsnprintf != "xyesyes"; then
        !            79:   AC_LIBOBJ(snprintf)
        !            80:   AC_MSG_WARN([Replacing missing/broken (v)snprintf() with sudo's version.])
        !            81:   AC_DEFINE(PREFER_PORTABLE_SNPRINTF, 1, [Enable replacement (v)snprintf if system (v)snprintf is broken.])
        !            82: fi])