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# ungetc.m4 serial 3
dnl Copyright (C) 2009-2013 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN_ONCE([gl_FUNC_UNGETC_WORKS],
[
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether ungetc works on arbitrary bytes],
[gl_cv_func_ungetc_works],
[AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#include <stdio.h>
]], [FILE *f;
if (!(f = fopen ("conftest.tmp", "w+"))) return 1;
if (fputs ("abc", f) < 0) return 2;
rewind (f);
if (fgetc (f) != 'a') return 3;
if (fgetc (f) != 'b') return 4;
if (ungetc ('d', f) != 'd') return 5;
if (ftell (f) != 1) return 6;
if (fgetc (f) != 'd') return 7;
if (ftell (f) != 2) return 8;
if (fseek (f, 0, SEEK_CUR) != 0) return 9;
if (ftell (f) != 2) return 10;
if (fgetc (f) != 'c') return 11;
fclose (f); remove ("conftest.tmp");])],
[gl_cv_func_ungetc_works=yes], [gl_cv_func_ungetc_works=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu*) gl_cv_func_ungetc_works="guessing yes" ;;
# If we don't know, assume the worst.
*) gl_cv_func_ungetc_works="guessing no" ;;
esac
])
])
case "$gl_cv_func_ungetc_works" in
*yes) ;;
*)
AC_DEFINE([FUNC_UNGETC_BROKEN], [1],
[Define to 1 if ungetc is broken when used on arbitrary bytes.])
;;
esac
])
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