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f542200938
* tests/misc/cut-huge-range.sh: On some systems returns_ may use more memory, so incorporate that in the determination of the ulimit value to use. Noticed on ARMv7 with bash-4.4.12, and x86_64 with bash-4.2.37. Fixes http://bugs.gnu.org/26253
68 lines
2.2 KiB
Bash
Executable File
68 lines
2.2 KiB
Bash
Executable File
#!/bin/sh
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# Ensure that cut does not allocate mem for large ranges
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# Copyright (C) 2012-2017 Free Software Foundation, Inc.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
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print_ver_ cut
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getlimits_
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vm=$(get_min_ulimit_v_ returns_ 0 cut -b1 /dev/null) \
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|| skip_ "this shell lacks ulimit support"
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# sed script to subtract one from the input.
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# Each input line should consist of a positive decimal number.
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# Each output line's number is one less than the input's.
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# There's no limit (other than line length) on the number's magnitude.
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subtract_one='
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s/$/@/
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: again
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s/0@/@9/
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s/1@/0/
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s/2@/1/
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s/3@/2/
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s/4@/3/
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s/5@/4/
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s/6@/5/
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s/7@/6/
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s/8@/7/
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s/9@/8/
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t again
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'
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# Ensure we can cut up to our sentinel value.
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# This is currently SIZE_MAX, but could be raised to UINTMAX_MAX
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# if we didn't allocate memory for each line as a unit.
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# Don't use expr to subtract one,
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# since SIZE_MAX may exceed its maximum value.
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CUT_MAX=$(echo $SIZE_MAX | sed "$subtract_one")
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# From coreutils-8.10 through 8.20, this would make cut try to allocate
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# a 256MiB bit vector.
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(ulimit -v $vm && cut -b$CUT_MAX- /dev/null > err 2>&1) || fail=1
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# Up to and including coreutils-8.21, cut would allocate possibly needed
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# memory upfront. Subsequently extra memory is no longer needed.
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(ulimit -v $vm && cut -b1-$CUT_MAX /dev/null >> err 2>&1) || fail=1
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# Explicitly disallow values above CUT_MAX
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(ulimit -v $vm && returns_ 1 cut -b$SIZE_MAX /dev/null 2>/dev/null) || fail=1
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(ulimit -v $vm && returns_ 1 cut -b$SIZE_OFLOW /dev/null 2>/dev/null) || fail=1
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compare /dev/null err || fail=1
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Exit $fail
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