head	1.3;
access;
symbols
	RELENG_8_4:1.3.0.2
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locks; strict;
comment	@# @;


1.3
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1.2
date	2002.05.19.05.14.02;	author grog;	state Exp;
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1.1
date	2002.05.19.04.37.39;	author grog;	state Exp;
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date	2012.11.17.01.50.29;	author svnexp;	state dead;
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1.3.2.2
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date	2012.11.17.08.03.49;	author svnexp;	state Exp;
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desc
@@


1.3
log
@Switching exporter and resync
@
text
@.\" Copyright (C) Caldera International Inc. 2001-2002.  All rights reserved.
.\" 
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions are
.\" met:
.\" 
.\" Redistributions of source code and documentation must retain the above
.\" copyright notice, this list of conditions and the following
.\" disclaimer.
.\" 
.\" 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.
.\" 
.\" All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" 
.\" This product includes software developed or owned by Caldera
.\" International, Inc.  Neither the name of Caldera International, Inc.
.\" nor the names of other contributors may be used to endorse or promote
.\" products derived from this software without specific prior written
.\" permission.
.\" 
.\" USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
.\" INTERNATIONAL, INC.  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 CALDERA INTERNATIONAL, INC. 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) RISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
.\" IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.\"	@@(#)ss8	8.1 (Berkeley) 6/8/93
.\"
.\" $FreeBSD: head/share/doc/psd/15.yacc/ss8 96913 2002-05-19 05:14:02Z grog $
.SH
8: The Yacc Environment
.PP
When the user inputs a specification
to Yacc, the output is a file of C programs, called
.I y.tab.c
on most
systems
(due to local file system conventions, the names may differ from
installation to installation).
The function produced by Yacc is called
.I yyparse \|;
it is an integer valued function.
When it is called, it in turn repeatedly calls
.I yylex ,
the lexical analyzer
supplied by the user (see Section 3)
to obtain input tokens.
Eventually, either an error is detected, in which case
(if no error recovery is possible)
.I yyparse
returns the value 1,
or the lexical analyzer returns the endmarker token
and the parser accepts.
In this case,
.I yyparse
returns the value 0.
.PP
The user must provide a certain amount of environment for this
parser in order to obtain a working program.
For example, as with every C program, a program called
.I main
must be defined, that eventually calls
.I yyparse .
In addition, a routine called
.I yyerror
prints a message
when a syntax error is detected.
.PP
These two routines must be supplied in one form or another by the
user.
To ease the initial effort of using Yacc, a library has been
provided with default versions of
.I main
and
.I yyerror .
The name of this library is system dependent;
on many systems the library is accessed by a
.B \-ly
argument to the loader.
To show the triviality of these default programs, the source is
given below:
.DS
main(){
	return( yyparse() );
	}
.DE
and
.DS
# include <stdio.h>

yyerror(s) char *s; {
	fprintf( stderr, "%s\en", s );
	}
.DE
The argument to
.I yyerror
is a string containing an error message, usually
the string ``syntax error''.
The average application will want to do better than this.
Ordinarily, the program should keep track of the input line number, and print it
along with the message when a syntax error is detected.
The external integer variable
.I yychar
contains the lookahead token number at the time the error was detected;
this may be of some interest in giving better diagnostics.
Since the
.I main
program is probably supplied by the user (to read arguments, etc.)
the Yacc library is useful only in small
projects, or in the earliest stages of larger ones.
.PP
The external integer variable
.I yydebug
is normally set to 0.
If it is set to a nonzero value, the parser will output a
verbose description of its actions, including
a discussion of which input symbols have been read, and
what the parser actions are.
Depending on the operating environment,
it may be possible to set this variable by using a debugging system.
@


1.3.2.1
log
@file ss8 was added on branch RELENG_8_4 on 2013-03-28 13:03:41 +0000
@
text
@d1 130
@


1.3.2.2
log
@## SVN ## Exported commit - http://svnweb.freebsd.org/changeset/base/248810
## SVN ## CVS IS DEPRECATED: http://wiki.freebsd.org/CvsIsDeprecated
@
text
@a0 130
.\" Copyright (C) Caldera International Inc. 2001-2002.  All rights reserved.
.\" 
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions are
.\" met:
.\" 
.\" Redistributions of source code and documentation must retain the above
.\" copyright notice, this list of conditions and the following
.\" disclaimer.
.\" 
.\" 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.
.\" 
.\" All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" 
.\" This product includes software developed or owned by Caldera
.\" International, Inc.  Neither the name of Caldera International, Inc.
.\" nor the names of other contributors may be used to endorse or promote
.\" products derived from this software without specific prior written
.\" permission.
.\" 
.\" USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
.\" INTERNATIONAL, INC.  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 CALDERA INTERNATIONAL, INC. 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) RISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
.\" IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.\"	@@(#)ss8	8.1 (Berkeley) 6/8/93
.\"
.\" $FreeBSD: releng/8.4/share/doc/psd/15.yacc/ss8 96913 2002-05-19 05:14:02Z grog $
.SH
8: The Yacc Environment
.PP
When the user inputs a specification
to Yacc, the output is a file of C programs, called
.I y.tab.c
on most
systems
(due to local file system conventions, the names may differ from
installation to installation).
The function produced by Yacc is called
.I yyparse \|;
it is an integer valued function.
When it is called, it in turn repeatedly calls
.I yylex ,
the lexical analyzer
supplied by the user (see Section 3)
to obtain input tokens.
Eventually, either an error is detected, in which case
(if no error recovery is possible)
.I yyparse
returns the value 1,
or the lexical analyzer returns the endmarker token
and the parser accepts.
In this case,
.I yyparse
returns the value 0.
.PP
The user must provide a certain amount of environment for this
parser in order to obtain a working program.
For example, as with every C program, a program called
.I main
must be defined, that eventually calls
.I yyparse .
In addition, a routine called
.I yyerror
prints a message
when a syntax error is detected.
.PP
These two routines must be supplied in one form or another by the
user.
To ease the initial effort of using Yacc, a library has been
provided with default versions of
.I main
and
.I yyerror .
The name of this library is system dependent;
on many systems the library is accessed by a
.B \-ly
argument to the loader.
To show the triviality of these default programs, the source is
given below:
.DS
main(){
	return( yyparse() );
	}
.DE
and
.DS
# include <stdio.h>

yyerror(s) char *s; {
	fprintf( stderr, "%s\en", s );
	}
.DE
The argument to
.I yyerror
is a string containing an error message, usually
the string ``syntax error''.
The average application will want to do better than this.
Ordinarily, the program should keep track of the input line number, and print it
along with the message when a syntax error is detected.
The external integer variable
.I yychar
contains the lookahead token number at the time the error was detected;
this may be of some interest in giving better diagnostics.
Since the
.I main
program is probably supplied by the user (to read arguments, etc.)
the Yacc library is useful only in small
projects, or in the earliest stages of larger ones.
.PP
The external integer variable
.I yydebug
is normally set to 0.
If it is set to a nonzero value, the parser will output a
verbose description of its actions, including
a discussion of which input symbols have been read, and
what the parser actions are.
Depending on the operating environment,
it may be possible to set this variable by using a debugging system.
@


1.2
log
@Remove original license disclaimer.
Add Caldera license.

Approved by:    David Taylor <davidt@@caldera.com>

Make roughly buildable under FreeBSD.

The results are not perfect: the original Makefile referred to a refer
file papers/Ind, which doesn't seem to have been kept, so the
references to other publications are missing.  In addition, the
pagination is not correct, with the result that some .DS/.DE blocks
leave large amounts of white space empty before them.  Possibly this
could be fixed by putting the (blank) footnotes at the end.

PR:   35345
Requested by:	Tony Finch <fanf@@dotat.at>
@
text
@d39 1
a39 1
.\" $FreeBSD$
@


1.2.24.1
log
@Switch importer
@
text
@d39 1
a39 1
.\" $FreeBSD: stable/7/share/doc/psd/15.yacc/ss8 96913 2002-05-19 05:14:02Z grog $
@


1.2.14.1
log
@Switch importer
@
text
@d39 1
a39 1
.\" $FreeBSD: stable/6/share/doc/psd/15.yacc/ss8 96913 2002-05-19 05:14:02Z grog $
@


1.2.42.1
log
@SVN rev 225736 on 2011-09-23 00:51:37Z by kensmith

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by:	re (implicit)
@
text
@@


1.2.42.2
log
@## SVN ##
## SVN ## Exported commit - http://svnweb.freebsd.org/changeset/base/ 242902
## SVN ## CVS IS DEPRECATED: http://wiki.freebsd.org/CvsIsDeprecated
## SVN ##
## SVN ## ------------------------------------------------------------------------
## SVN ## r242902 | dteske | 2012-11-11 23:29:45 +0000 (Sun, 11 Nov 2012) | 10 lines
## SVN ##
## SVN ## Fix a regression introduced by SVN r211417 that saw the breakage of a feature
## SVN ## documented in usr.sbin/sysinstall/help/shortcuts.hlp (reproduced below):
## SVN ##
## SVN ## If /usr/sbin/sysinstall is linked to another filename, say
## SVN ## `/usr/local/bin/configPackages', then the basename will be used
## SVN ## as an implicit command name.
## SVN ##
## SVN ## Reviewed by:	adrian (co-mentor)
## SVN ## Approved by:	adrian (co-mentor)
## SVN ##
## SVN ## ------------------------------------------------------------------------
## SVN ##
@
text
@d39 1
a39 1
.\" $FreeBSD: stable/9/share/doc/psd/15.yacc/ss8 96913 2002-05-19 05:14:02Z grog $
@


1.2.42.1.4.1
log
@SVN rev 239080 on 2012-08-05 23:54:33Z by kensmith

Copy stable/9 to releng/9.1 as part of the 9.1-RELEASE release process.

Approved by:	re (implicit)
@
text
@@


1.2.42.1.4.2
log
@Switch importer
@
text
@d39 1
a39 1
.\" $FreeBSD: releng/9.1/share/doc/psd/15.yacc/ss8 96913 2002-05-19 05:14:02Z grog $
@


1.2.42.1.2.1
log
@SVN rev 227445 on 2011-11-11 04:20:22Z by kensmith

Copy stable/9 to releng/9.0 as part of the FreeBSD 9.0-RELEASE release
cycle.

Approved by:	re (implicit)
@
text
@@


1.2.42.1.2.2
log
@Switch importer
@
text
@d39 1
a39 1
.\" $FreeBSD: releng/9.0/share/doc/psd/15.yacc/ss8 96913 2002-05-19 05:14:02Z grog $
@


1.2.40.1
log
@SVN rev 216618 on 2010-12-21 17:10:29Z by kensmith

Copy stable/7 to releng/7.4 in preparation for FreeBSD-7.4 release.

Approved by:	re (implicit)
@
text
@@


1.2.40.2
log
@Switch importer
@
text
@d39 1
a39 1
.\" $FreeBSD: releng/7.4/share/doc/psd/15.yacc/ss8 96913 2002-05-19 05:14:02Z grog $
@


1.2.38.1
log
@SVN rev 203736 on 2010-02-10 00:26:20Z by kensmith

Copy stable/7 to releng/7.3 as part of the 7.3-RELEASE process.

Approved by:	re (implicit)
@
text
@@


1.2.36.1
log
@SVN rev 196045 on 2009-08-03 08:13:06Z by kensmith

Copy head to stable/8 as part of 8.0 Release cycle.

Approved by:	re (Implicit)
@
text
@@


1.2.36.2
log
@## SVN ##
## SVN ## Exported commit - http://svnweb.freebsd.org/changeset/base/ 242909
## SVN ## CVS IS DEPRECATED: http://wiki.freebsd.org/CvsIsDeprecated
## SVN ##
## SVN ## ------------------------------------------------------------------------
## SVN ## r242909 | dim | 2012-11-12 07:47:19 +0000 (Mon, 12 Nov 2012) | 20 lines
## SVN ##
## SVN ## MFC r242625:
## SVN ##
## SVN ## Remove duplicate const specifiers in many drivers (I hope I got all of
## SVN ## them, please let me know if not).  Most of these are of the form:
## SVN ##
## SVN ## static const struct bzzt_type {
## SVN ##       [...list of members...]
## SVN ## } const bzzt_devs[] = {
## SVN ##       [...list of initializers...]
## SVN ## };
## SVN ##
## SVN ## The second const is unnecessary, as arrays cannot be modified anyway,
## SVN ## and if the elements are const, the whole thing is const automatically
## SVN ## (e.g. it is placed in .rodata).
## SVN ##
## SVN ## I have verified this does not change the binary output of a full kernel
## SVN ## build (except for build timestamps embedded in the object files).
## SVN ##
## SVN ## Reviewed by:	yongari, marius
## SVN ##
## SVN ## ------------------------------------------------------------------------
## SVN ##
@
text
@d39 1
a39 1
.\" $FreeBSD: stable/8/share/doc/psd/15.yacc/ss8 96913 2002-05-19 05:14:02Z grog $
@


1.2.36.1.8.1
log
@SVN rev 232438 on 2012-03-03 06:15:13Z by kensmith

Copy stable/8 to releng/8.3 as part of 8.3-RELEASE release cycle.

Approved by:	re (implicit)
@
text
@@


1.2.36.1.8.2
log
@Switch importer
@
text
@d39 1
a39 1
.\" $FreeBSD: releng/8.3/share/doc/psd/15.yacc/ss8 96913 2002-05-19 05:14:02Z grog $
@


1.2.36.1.6.1
log
@SVN rev 216617 on 2010-12-21 17:09:25Z by kensmith

Copy stable/8 to releng/8.2 in preparation for FreeBSD-8.2 release.

Approved by:	re (implicit)
@
text
@@


1.2.36.1.4.1
log
@SVN rev 209145 on 2010-06-14 02:09:06Z by kensmith

Copy stable/8 to releng/8.1 in preparation for 8.1-RC1.

Approved by:	re (implicit)
@
text
@@


1.2.36.1.2.1
log
@SVN rev 198460 on 2009-10-25 01:10:29Z by kensmith

Copy stable/8 to releng/8.0 as part of 8.0-RELEASE release procedure.

Approved by:	re (implicit)
@
text
@@


1.2.34.1
log
@SVN rev 191087 on 2009-04-15 03:14:26Z by kensmith

Create releng/7.2 from stable/7 in preparation for 7.2-RELEASE.

Approved by:	re (implicit)
@
text
@@


1.2.32.1
log
@SVN rev 185281 on 2008-11-25 02:59:29Z by kensmith

Create releng/7.1 in preparation for moving into RC phase of 7.1 release
cycle.

Approved by:	re (implicit)
@
text
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1.2.30.1
log
@SVN rev 183531 on 2008-10-02 02:57:24Z by kensmith

Create releng/6.4 from stable/6 in preparation for 6.4-RC1.

Approved by:	re (implicit)
@
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1.1
log
@Initial checkin: 4.4BSD version.  These files need to be updated with
current license information and adapted to the FreeBSD build
environment before they will build.

Approved by:    David Taylor <davidt@@caldera.com>
@
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@d1 35
a35 3
.\" This module is believed to contain source code proprietary to AT&T.
.\" Use and redistribution is subject to the Berkeley Software License
.\" Agreement and your Software Agreement with AT&T (Western Electric).
@

