1cea028198
Erwin ran an exp-run with libcompat and <regexp.h> removed. It turns out the regexp library is almost entirely unused. In fact, it looks like it is sometimes used by accident. Because these function names clash with libc's <regex.h>, some application use both <regex.h> and libcompat, which means they link against the wrong regex library. This commit removes the regexp library and reimplements re_comp() and re_exec() using <regex.h>. It seems the grammar of the regular expressions accepted by these functions is similar to POSIX EREs. After this commit, 1 low-profile port will be broken, but the maintainer already has a patch for it sitting in his mailbox.
121 lines
3.3 KiB
Groff
121 lines
3.3 KiB
Groff
.\" Copyright (c) 1980, 1991, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)re_comp.3 8.1 (Berkeley) 6/4/93
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd June 4, 1993
|
|
.Dt RE_COMP 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm re_comp ,
|
|
.Nm re_exec
|
|
.Nd regular expression handler
|
|
.Sh LIBRARY
|
|
.Lb libcompat
|
|
.Sh SYNOPSIS
|
|
.In unistd.h
|
|
.Ft char *
|
|
.Fn re_comp "const char *s"
|
|
.Ft int
|
|
.Fn re_exec "const char *s"
|
|
.Sh DESCRIPTION
|
|
.Bf -symbolic
|
|
This interface is made obsolete by
|
|
.Xr regex 3 .
|
|
.Ef
|
|
.Pp
|
|
The
|
|
.Fn re_comp
|
|
function
|
|
compiles a string into an internal form suitable for pattern matching.
|
|
The
|
|
.Fn re_exec
|
|
function
|
|
checks the argument string against the last string passed to
|
|
.Fn re_comp .
|
|
.Pp
|
|
The
|
|
.Fn re_comp
|
|
function
|
|
returns 0 if the string
|
|
.Fa s
|
|
was compiled successfully; otherwise a string containing an
|
|
error message is returned.
|
|
If
|
|
.Fn re_comp
|
|
is passed 0 or a null string, it returns without changing the currently
|
|
compiled regular expression.
|
|
.Pp
|
|
The
|
|
.Fn re_exec
|
|
function
|
|
returns 1 if the string
|
|
.Fa s
|
|
matches the last compiled regular expression, 0 if the string
|
|
.Fa s
|
|
failed to match the last compiled regular expression, and \-1 if the compiled
|
|
regular expression was invalid (indicating an internal error).
|
|
.Pp
|
|
The strings passed to both
|
|
.Fn re_comp
|
|
and
|
|
.Fn re_exec
|
|
may have trailing or embedded newline characters;
|
|
they are terminated by
|
|
.Dv NUL Ns s .
|
|
The regular expressions recognized are described in the manual entry for
|
|
.Xr ed 1 ,
|
|
given the above difference.
|
|
.Sh DIAGNOSTICS
|
|
The
|
|
.Fn re_exec
|
|
function
|
|
returns \-1 for an internal error.
|
|
.Pp
|
|
The
|
|
.Fn re_comp
|
|
function
|
|
returns
|
|
.Dq no previous regular expression
|
|
or one of the strings generated by
|
|
.Xr regerror 3 .
|
|
.Sh SEE ALSO
|
|
.Xr ed 1 ,
|
|
.Xr egrep 1 ,
|
|
.Xr ex 1 ,
|
|
.Xr fgrep 1 ,
|
|
.Xr grep 1 ,
|
|
.Xr regex 3
|
|
.Sh HISTORY
|
|
The
|
|
.Fn re_comp
|
|
and
|
|
.Fn re_exec
|
|
functions appeared in
|
|
.Bx 4.0 .
|