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#!/bin/sh
# Detect printf(3) failure even when it doesn't set stream error indicator
# Copyright (C) 2007 Free Software Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
prog="$abs_top_builddir/src/printf"
if test "$VERBOSE" = yes; then
set -x
"$prog" --version
fi
. $srcdir/../test-lib.sh
require_ulimit_
fail=0
# Up to coreutils-6.9, "printf %.Nf 0" would encounter an ENOMEM internal
# error from glibc's printf(3) function whenever N was large relative to
# the size of available memory. As of Oct 2007, that internal stream-
# related failure was not reflected (for any libc I know of) in the usual
# stream error indicator that is tested by ferror. The result was that
# while the printf command obviously failed (generated no output),
# it mistakenly exited successfully (exit status of 0).
# Testing it is tricky, because there is so much variance
# in quality for this corner of printf(3) implementations.
# Most implementations do attempt to allocate N bytes of storage.
# Using the maximum value for N (2^31-1) causes glibc to try to
# allocate almost 2^64 bytes, while freeBSD 6.1's implementation
# correctly outputs almost 2GB worth of 0's, which takes too long.
# We want to test implementations that allocate N bytes, but without
# triggering the above extremes.
# The compromise is to limit virtual memory to something reasonable,
# and to make an N-byte-allocating-printf require more than that, thus
# triggering the printf(3) misbehavior -- which, btw, is required by ISO C99.
( ulimit -v 10000
"$prog" %20000000f 0 2>err | head -c 10 >out )
# Map this longer, and rarer, diagnostic to the common one.
# printf: cannot perform formatted output: Cannot allocate memory" \
sed 's/cannot perform .*/write error/' err > k && mv k err
case $(cat err) in
"$prog: write error") diagnostic=y ;;
'') diagnostic=n ;;
*) diagnostic=unexpected ;;
esac
n_out=$(wc -c < out)
case $n_out:$diagnostic in
10:n) ;; # ok, succeeds w/no diagnostic: FreeBSD 6.1
0:y) ;; # ok, glibc, when printf(3) fails with ENOMEM
# 10:y) ;; # Fail: doesn't happen: nobody succeeds with a diagnostic
# 0:n) ;; # Fail pre-patch: no output, no diag
*) fail=1;
esac
(exit $fail); exit $fail
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