mirror of https://github.com/sudo-project/sudo.git
86 lines
2.9 KiB
Plaintext
86 lines
2.9 KiB
Plaintext
# ===========================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_func_snprintf.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_FUNC_SNPRINTF
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#
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# DESCRIPTION
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#
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# Checks for a fully C99 compliant snprintf, in particular checks whether
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# it does bounds checking and returns the correct string length; does the
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# same check for vsnprintf. If no working snprintf or vsnprintf is found,
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# request a replacement and warn the user about it. Note: the mentioned
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# replacement is freely available and may be used in any project
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# regardless of it's license.
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#
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# LICENSE
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#
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# Copyright (c) 2008 Ruediger Kuhlmann <info@ruediger-kuhlmann.de>
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved. This file is offered as-is, without any
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# warranty.
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#serial 7
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AU_ALIAS([AC_FUNC_SNPRINTF], [AX_FUNC_SNPRINTF])
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AC_DEFUN([AX_FUNC_SNPRINTF],
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[AC_CHECK_FUNCS(snprintf vsnprintf)
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AC_MSG_CHECKING(for working snprintf)
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AC_CACHE_VAL(ac_cv_have_working_snprintf,
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[AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <stdio.h>
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#include <string.h>
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int main(void)
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{
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char bufs[5] = { 'x', 'x', 'x', '\0', '\0' };
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char bufd[5] = { 'x', 'x', 'x', '\0', '\0' };
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int i;
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i = snprintf (bufs, 2, "%s", "111");
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if (strcmp (bufs, "1")) return (1);
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if (i != 3) return (1);
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i = snprintf (bufd, 2, "%d", 111);
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if (strcmp (bufd, "1")) return (1);
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if (i != 3) return (1);
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return(0);
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}]])],[ac_cv_have_working_snprintf=yes],[ac_cv_have_working_snprintf=no],[ac_cv_have_working_snprintf=cross])])
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AC_MSG_RESULT([$ac_cv_have_working_snprintf])
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AC_MSG_CHECKING(for working vsnprintf)
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AC_CACHE_VAL(ac_cv_have_working_vsnprintf,
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[AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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int my_vsnprintf (char *buf, const char *tmpl, ...)
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{
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int i;
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va_list args;
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va_start (args, tmpl);
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i = vsnprintf (buf, 2, tmpl, args);
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va_end (args);
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return i;
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}
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int main(void)
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{
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char bufs[5] = { 'x', 'x', 'x', '\0', '\0' };
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char bufd[5] = { 'x', 'x', 'x', '\0', '\0' };
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int i;
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i = my_vsnprintf (bufs, "%s", "111");
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if (strcmp (bufs, "1")) return (1);
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if (i != 3) return (1);
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i = my_vsnprintf (bufd, "%d", 111);
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if (strcmp (bufd, "1")) return (1);
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if (i != 3) return (1);
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return(0);
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}]])],[ac_cv_have_working_vsnprintf=yes],[ac_cv_have_working_vsnprintf=no],[ac_cv_have_working_vsnprintf=cross])])
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AC_MSG_RESULT([$ac_cv_have_working_vsnprintf])
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if test x$ac_cv_have_working_snprintf$ac_cv_have_working_vsnprintf != "xyesyes"; then
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AC_LIBOBJ(snprintf)
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AC_MSG_WARN([Replacing missing/broken (v)snprintf() with sudo's version.])
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AC_DEFINE(PREFER_PORTABLE_SNPRINTF, 1, [Enable replacement (v)snprintf if system (v)snprintf is broken.])
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fi])
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