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Fix crash for --line-buffered with a .gz or .bz2 file in pcre2grep.

This commit is contained in:
Philip.Hazel 2017-11-13 17:12:55 +00:00
parent 76814d92c7
commit 2543ba81f7
3 changed files with 24 additions and 15 deletions
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4
ChangeLog
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@ -51,6 +51,10 @@ subsequent lines. Behaviour was different with and without colouring, and
sometimes context lines were incorrectly printed and/or line endings were lost.
All these issues should now be fixed.
14. If --line-buffered was specified for pcre2grep when input was from a
compressed file (.gz or .bz2) a segfault occurred. (Line buffering should be
ignored for compressed files.)
Version 10.30 14-August-2017
----------------------------

34
doc/pcre2grep.1
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@ -1,4 +1,4 @@
.TH PCRE2GREP 1 "23 October 2017" "PCRE2 10.31"
.TH PCRE2GREP 1 "13 November 2017" "PCRE2 10.31"
.SH NAME
pcre2grep - a grep with Perl-compatible regular expressions.
.SH SYNOPSIS
@ -101,11 +101,13 @@ The \fB--locale\fP option can be used to override this.
.rs
.sp
It is possible to compile \fBpcre2grep\fP so that it uses \fBlibz\fP or
\fBlibbz2\fP to read files whose names end in \fB.gz\fP or \fB.bz2\fP,
respectively. You can find out whether your binary has support for one or both
of these file types by running it with the \fB--help\fP option. If the
appropriate support is not present, files are treated as plain text. The
standard input is always so treated.
\fBlibbz2\fP to read compressed files whose names end in \fB.gz\fP or
\fB.bz2\fP, respectively. You can find out whether your \fBpcre2grep\fP binary
has support for one or both of these file types by running it with the
\fB--help\fP option. If the appropriate support is not present, all files are
treated as plain text. The standard input is always so treated. When input is
from a compressed .gz or .bz2 file, the \fB--line-buffered\fP option is
ignored.
.
.
.SH "BINARY FILES"
@ -417,14 +419,16 @@ are being output. If not supplied, "(standard input)" is used. There is no
short form for this option.
.TP
\fB--line-buffered\fP
When this option is given, input is read and processed line by line, and the
output is flushed after each write. By default, input is read in large chunks,
unless \fBpcre2grep\fP can determine that it is reading from a terminal (which
is currently possible only in Unix-like environments). Output to terminal is
normally automatically flushed by the operating system. This option can be
useful when the input or output is attached to a pipe and you do not want
\fBpcre2grep\fP to buffer up large amounts of data. However, its use will
affect performance, and the \fB-M\fP (multiline) option ceases to work.
When this option is given, non-compressed input is read and processed line by
line, and the output is flushed after each write. By default, input is read in
large chunks, unless \fBpcre2grep\fP can determine that it is reading from a
terminal (which is currently possible only in Unix-like environments). Output
to terminal is normally automatically flushed by the operating system. This
option can be useful when the input or output is attached to a pipe and you do
not want \fBpcre2grep\fP to buffer up large amounts of data. However, its use
will affect performance, and the \fB-M\fP (multiline) option ceases to work.
When input is from a compressed .gz or .bz2 file, \fB--line-buffered\fP is
ignored.
.TP
\fB--line-offsets\fP
Instead of showing lines or parts of lines that match, show each match as a
@ -858,6 +862,6 @@ Cambridge, England.
.rs
.sp
.nf
Last updated: 23 October 2017
Last updated: 13 November 2017
Copyright (c) 1997-2017 University of Cambridge.
.fi

1
src/pcre2grep.c
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@ -2332,6 +2332,7 @@ if (frtype != FR_LIBZ && frtype != FR_LIBBZ2)
in = (FILE *)handle;
if (is_file_tty(in)) input_line_buffered = TRUE;
}
else input_line_buffered = FALSE;
bufflength = fill_buffer(handle, frtype, main_buffer, bufsize,
input_line_buffered);