682 lines
16 KiB
C
682 lines
16 KiB
C
/* RCS file syntactic analysis */
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/******************************************************************************
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* Syntax Analysis.
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* Keyword table
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* Testprogram: define SYNTEST
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* Compatibility with Release 2: define COMPAT2=1
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******************************************************************************
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*/
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/* Copyright 1982, 1988, 1989 Walter Tichy
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Copyright 1990, 1991, 1992, 1993, 1994, 1995 Paul Eggert
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Distributed under license by the Free Software Foundation, Inc.
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This file is part of RCS.
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RCS 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 2, or (at your option)
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any later version.
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RCS 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 RCS; see the file COPYING.
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If not, write to the Free Software Foundation,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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Report problems and direct all questions to:
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rcs-bugs@cs.purdue.edu
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*/
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/*
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* Revision 5.15 1995/06/16 06:19:24 eggert
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* Update FSF address.
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*
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* Revision 5.14 1995/06/01 16:23:43 eggert
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* (expand_names): Add "b" for -kb.
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* (getdelta): Don't strip leading "19" from MKS RCS dates; see cmpdate.
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*
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* Revision 5.13 1994/03/20 04:52:58 eggert
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* Remove lint.
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*
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* Revision 5.12 1993/11/03 17:42:27 eggert
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* Parse MKS RCS dates; ignore \r in diff control lines.
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* Don't discard ignored phrases. Improve quality of diagnostics.
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*
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* Revision 5.11 1992/07/28 16:12:44 eggert
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* Avoid `unsigned'. Statement macro names now end in _.
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*
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* Revision 5.10 1992/01/24 18:44:19 eggert
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* Move put routines to rcsgen.c.
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*
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* Revision 5.9 1992/01/06 02:42:34 eggert
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* ULONG_MAX/10 -> ULONG_MAX_OVER_10
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* while (E) ; -> while (E) continue;
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*
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* Revision 5.8 1991/08/19 03:13:55 eggert
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* Tune.
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*
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* Revision 5.7 1991/04/21 11:58:29 eggert
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* Disambiguate names on shortname hosts.
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* Fix errno bug. Add MS-DOS support.
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*
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* Revision 5.6 1991/02/28 19:18:51 eggert
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* Fix null termination bug in reporting keyword expansion.
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*
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* Revision 5.5 1991/02/25 07:12:44 eggert
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* Check diff output more carefully; avoid overflow.
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*
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* Revision 5.4 1990/11/01 05:28:48 eggert
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* When ignoring unknown phrases, copy them to the output RCS file.
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* Permit arbitrary data in logs and comment leaders.
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* Don't check for nontext on initial checkin.
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*
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* Revision 5.3 1990/09/20 07:58:32 eggert
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* Remove the test for non-text bytes; it caused more pain than it cured.
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*
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* Revision 5.2 1990/09/04 08:02:30 eggert
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* Parse RCS files with no revisions.
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* Don't strip leading white space from diff commands. Count RCS lines better.
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*
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* Revision 5.1 1990/08/29 07:14:06 eggert
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* Add -kkvl. Clean old log messages too.
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*
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* Revision 5.0 1990/08/22 08:13:44 eggert
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* Try to parse future RCS formats without barfing.
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* Add -k. Don't require final newline.
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* Remove compile-time limits; use malloc instead.
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* Don't output branch keyword if there's no default branch,
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* because RCS version 3 doesn't understand it.
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* Tune. Remove lint.
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* Add support for ISO 8859. Ansify and Posixate.
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* Check that a newly checked-in file is acceptable as input to 'diff'.
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* Check diff's output.
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*
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* Revision 4.6 89/05/01 15:13:32 narten
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* changed copyright header to reflect current distribution rules
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*
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* Revision 4.5 88/08/09 19:13:21 eggert
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* Allow cc -R; remove lint.
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*
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* Revision 4.4 87/12/18 11:46:16 narten
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* more lint cleanups (Guy Harris)
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*
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* Revision 4.3 87/10/18 10:39:36 narten
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* Updating version numbers. Changes relative to 1.1 actually relative to
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* 4.1
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*
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* Revision 1.3 87/09/24 14:00:49 narten
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* Sources now pass through lint (if you ignore printf/sprintf/fprintf
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* warnings)
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*
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* Revision 1.2 87/03/27 14:22:40 jenkins
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* Port to suns
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*
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* Revision 4.1 83/03/28 11:38:49 wft
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* Added parsing and printing of default branch.
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*
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* Revision 3.6 83/01/15 17:46:50 wft
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* Changed readdelta() to initialize selector and log-pointer.
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* Changed puttree to check for selector==DELETE; putdtext() uses DELNUMFORM.
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*
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* Revision 3.5 82/12/08 21:58:58 wft
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* renamed Commentleader to Commleader.
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*
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* Revision 3.4 82/12/04 13:24:40 wft
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* Added routine gettree(), which updates keeplock after reading the
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* delta tree.
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*
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* Revision 3.3 82/11/28 21:30:11 wft
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* Reading and printing of Suffix removed; version COMPAT2 skips the
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* Suffix for files of release 2 format. Fixed problems with printing nil.
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*
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* Revision 3.2 82/10/18 21:18:25 wft
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* renamed putdeltatext to putdtext.
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*
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* Revision 3.1 82/10/11 19:45:11 wft
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* made sure getc() returns into an integer.
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*/
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/* version COMPAT2 reads files of the format of release 2 and 3, but
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* generates files of release 3 format. Need not be defined if no
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* old RCS files generated with release 2 exist.
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*/
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#include "rcsbase.h"
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libId(synId, "$Id$")
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static char const *getkeyval P((char const*,enum tokens,int));
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static int getdelta P((void));
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static int strn2expmode P((char const*,size_t));
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static struct hshentry *getdnum P((void));
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static void badDiffOutput P((char const*)) exiting;
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static void diffLineNumberTooLarge P((char const*)) exiting;
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static void getsemi P((char const*));
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/* keyword table */
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char const
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Kaccess[] = "access",
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Kauthor[] = "author",
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Kbranch[] = "branch",
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Kcomment[] = "comment",
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Kdate[] = "date",
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Kdesc[] = "desc",
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Kexpand[] = "expand",
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Khead[] = "head",
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Klocks[] = "locks",
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Klog[] = "log",
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Knext[] = "next",
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Kstate[] = "state",
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Kstrict[] = "strict",
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Ksymbols[] = "symbols",
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Ktext[] = "text";
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static char const
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#if COMPAT2
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Ksuffix[] = "suffix",
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#endif
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K_branches[]= "branches";
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static struct buf Commleader;
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struct cbuf Comment;
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struct cbuf Ignored;
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struct access * AccessList;
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struct assoc * Symbols;
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struct rcslock *Locks;
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int Expand;
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int StrictLocks;
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struct hshentry * Head;
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char const * Dbranch;
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int TotalDeltas;
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static void
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getsemi(key)
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char const *key;
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/* Get a semicolon to finish off a phrase started by KEY. */
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{
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if (!getlex(SEMI))
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fatserror("missing ';' after '%s'", key);
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}
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static struct hshentry *
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getdnum()
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/* Get a delta number. */
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{
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register struct hshentry *delta = getnum();
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if (delta && countnumflds(delta->num)&1)
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fatserror("%s isn't a delta number", delta->num);
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return delta;
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}
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void
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getadmin()
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/* Read an <admin> and initialize the appropriate global variables. */
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{
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register char const *id;
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struct access * newaccess;
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struct assoc * newassoc;
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struct rcslock *newlock;
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struct hshentry * delta;
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struct access **LastAccess;
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struct assoc **LastSymbol;
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struct rcslock **LastLock;
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struct buf b;
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struct cbuf cb;
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TotalDeltas=0;
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getkey(Khead);
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Head = getdnum();
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getsemi(Khead);
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Dbranch = 0;
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if (getkeyopt(Kbranch)) {
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if ((delta = getnum()))
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Dbranch = delta->num;
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getsemi(Kbranch);
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}
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#if COMPAT2
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/* read suffix. Only in release 2 format */
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if (getkeyopt(Ksuffix)) {
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if (nexttok==STRING) {
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readstring(); nextlex(); /* Throw away the suffix. */
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} else if (nexttok==ID) {
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nextlex();
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}
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getsemi(Ksuffix);
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}
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#endif
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getkey(Kaccess);
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LastAccess = &AccessList;
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while ((id = getid())) {
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newaccess = ftalloc(struct access);
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newaccess->login = id;
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*LastAccess = newaccess;
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LastAccess = &newaccess->nextaccess;
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}
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*LastAccess = 0;
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getsemi(Kaccess);
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getkey(Ksymbols);
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LastSymbol = &Symbols;
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while ((id = getid())) {
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if (!getlex(COLON))
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fatserror("missing ':' in symbolic name definition");
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if (!(delta=getnum())) {
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fatserror("missing number in symbolic name definition");
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} else { /*add new pair to association list*/
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newassoc = ftalloc(struct assoc);
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newassoc->symbol=id;
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newassoc->num = delta->num;
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*LastSymbol = newassoc;
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LastSymbol = &newassoc->nextassoc;
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}
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}
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*LastSymbol = 0;
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getsemi(Ksymbols);
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getkey(Klocks);
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LastLock = &Locks;
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while ((id = getid())) {
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if (!getlex(COLON))
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fatserror("missing ':' in lock");
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if (!(delta=getdnum())) {
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fatserror("missing number in lock");
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} else { /*add new pair to lock list*/
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newlock = ftalloc(struct rcslock);
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newlock->login=id;
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newlock->delta=delta;
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*LastLock = newlock;
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LastLock = &newlock->nextlock;
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}
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}
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*LastLock = 0;
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getsemi(Klocks);
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if ((StrictLocks = getkeyopt(Kstrict)))
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getsemi(Kstrict);
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clear_buf(&Comment);
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if (getkeyopt(Kcomment)) {
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if (nexttok==STRING) {
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Comment = savestring(&Commleader);
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nextlex();
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}
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getsemi(Kcomment);
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}
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Expand = KEYVAL_EXPAND;
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if (getkeyopt(Kexpand)) {
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if (nexttok==STRING) {
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bufautobegin(&b);
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cb = savestring(&b);
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if ((Expand = strn2expmode(cb.string,cb.size)) < 0)
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fatserror("unknown expand mode %.*s",
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(int)cb.size, cb.string
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);
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bufautoend(&b);
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nextlex();
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}
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getsemi(Kexpand);
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}
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Ignored = getphrases(Kdesc);
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}
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char const *const expand_names[] = {
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/* These must agree with *_EXPAND in rcsbase.h. */
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"kv", "kvl", "k", "v", "o", "b",
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0
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};
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int
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str2expmode(s)
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char const *s;
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/* Yield expand mode corresponding to S, or -1 if bad. */
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{
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return strn2expmode(s, strlen(s));
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}
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static int
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strn2expmode(s, n)
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char const *s;
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size_t n;
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{
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char const *const *p;
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for (p = expand_names; *p; ++p)
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if (memcmp(*p,s,n) == 0 && !(*p)[n])
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return p - expand_names;
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return -1;
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}
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void
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ignorephrases(key)
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const char *key;
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/*
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* Ignore a series of phrases that do not start with KEY.
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* Stop when the next phrase starts with a token that is not an identifier,
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* or is KEY.
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*/
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{
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for (;;) {
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nextlex();
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if (nexttok != ID || strcmp(NextString,key) == 0)
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break;
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warnignore();
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hshenter=false;
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for (;; nextlex()) {
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switch (nexttok) {
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case SEMI: hshenter=true; break;
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case ID:
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case NUM: ffree1(NextString); continue;
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case STRING: readstring(); continue;
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default: continue;
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}
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break;
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}
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}
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}
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static int
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getdelta()
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/* Function: reads a delta block.
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* returns false if the current block does not start with a number.
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*/
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{
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register struct hshentry * Delta, * num;
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struct branchhead **LastBranch, *NewBranch;
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if (!(Delta = getdnum()))
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return false;
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hshenter = false; /*Don't enter dates into hashtable*/
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Delta->date = getkeyval(Kdate, NUM, false);
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hshenter=true; /*reset hshenter for revision numbers.*/
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Delta->author = getkeyval(Kauthor, ID, false);
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Delta->state = getkeyval(Kstate, ID, true);
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getkey(K_branches);
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LastBranch = &Delta->branches;
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while ((num = getdnum())) {
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NewBranch = ftalloc(struct branchhead);
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NewBranch->hsh = num;
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*LastBranch = NewBranch;
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LastBranch = &NewBranch->nextbranch;
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}
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*LastBranch = 0;
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getsemi(K_branches);
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getkey(Knext);
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Delta->next = num = getdnum();
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getsemi(Knext);
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Delta->lockedby = 0;
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Delta->log.string = 0;
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Delta->selector = true;
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Delta->ig = getphrases(Kdesc);
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TotalDeltas++;
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return (true);
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}
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void
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gettree()
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/* Function: Reads in the delta tree with getdelta(), then
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* updates the lockedby fields.
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*/
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{
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struct rcslock const *currlock;
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while (getdelta())
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continue;
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currlock=Locks;
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while (currlock) {
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currlock->delta->lockedby = currlock->login;
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currlock = currlock->nextlock;
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}
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}
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void
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getdesc(prdesc)
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int prdesc;
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/* Function: read in descriptive text
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* nexttok is not advanced afterwards.
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* If prdesc is set, the text is printed to stdout.
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*/
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{
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getkeystring(Kdesc);
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if (prdesc)
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printstring(); /*echo string*/
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else readstring(); /*skip string*/
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}
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static char const *
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getkeyval(keyword, token, optional)
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char const *keyword;
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enum tokens token;
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int optional;
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/* reads a pair of the form
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* <keyword> <token> ;
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* where token is one of <id> or <num>. optional indicates whether
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* <token> is optional. A pointer to
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* the actual character string of <id> or <num> is returned.
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*/
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{
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register char const *val = 0;
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getkey(keyword);
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if (nexttok==token) {
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val = NextString;
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nextlex();
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} else {
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if (!optional)
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fatserror("missing %s", keyword);
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}
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getsemi(keyword);
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return(val);
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}
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void
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unexpected_EOF()
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{
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rcsfaterror("unexpected EOF in diff output");
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}
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void
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initdiffcmd(dc)
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register struct diffcmd *dc;
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/* Initialize *dc suitably for getdiffcmd(). */
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{
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dc->adprev = 0;
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dc->dafter = 0;
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}
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static void
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badDiffOutput(buf)
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char const *buf;
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{
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rcsfaterror("bad diff output line: %s", buf);
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}
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static void
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diffLineNumberTooLarge(buf)
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char const *buf;
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{
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rcsfaterror("diff line number too large: %s", buf);
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}
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int
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getdiffcmd(finfile, delimiter, foutfile, dc)
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RILE *finfile;
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FILE *foutfile;
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int delimiter;
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struct diffcmd *dc;
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/* Get a editing command output by 'diff -n' from fin.
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* The input is delimited by SDELIM if delimiter is set, EOF otherwise.
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* Copy a clean version of the command to fout (if nonnull).
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* Yield 0 for 'd', 1 for 'a', and -1 for EOF.
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* Store the command's line number and length into dc->line1 and dc->nlines.
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* Keep dc->adprev and dc->dafter up to date.
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*/
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{
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register int c;
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declarecache;
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register FILE *fout;
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register char *p;
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register RILE *fin;
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long line1, nlines, t;
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char buf[BUFSIZ];
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fin = finfile;
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fout = foutfile;
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setupcache(fin); cache(fin);
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cachegeteof_(c, { if (delimiter) unexpected_EOF(); return -1; } )
|
|
if (delimiter) {
|
|
if (c==SDELIM) {
|
|
cacheget_(c)
|
|
if (c==SDELIM) {
|
|
buf[0] = c;
|
|
buf[1] = 0;
|
|
badDiffOutput(buf);
|
|
}
|
|
uncache(fin);
|
|
nextc = c;
|
|
if (fout)
|
|
aprintf(fout, "%c%c", SDELIM, c);
|
|
return -1;
|
|
}
|
|
}
|
|
p = buf;
|
|
do {
|
|
if (buf+BUFSIZ-2 <= p) {
|
|
rcsfaterror("diff output command line too long");
|
|
}
|
|
*p++ = c;
|
|
cachegeteof_(c, unexpected_EOF();)
|
|
} while (c != '\n');
|
|
uncache(fin);
|
|
if (delimiter)
|
|
++rcsline;
|
|
*p = '\0';
|
|
for (p = buf+1; (c = *p++) == ' '; )
|
|
continue;
|
|
line1 = 0;
|
|
while (isdigit(c)) {
|
|
if (
|
|
LONG_MAX/10 < line1 ||
|
|
(t = line1 * 10, (line1 = t + (c - '0')) < t)
|
|
)
|
|
diffLineNumberTooLarge(buf);
|
|
c = *p++;
|
|
}
|
|
while (c == ' ')
|
|
c = *p++;
|
|
nlines = 0;
|
|
while (isdigit(c)) {
|
|
if (
|
|
LONG_MAX/10 < nlines ||
|
|
(t = nlines * 10, (nlines = t + (c - '0')) < t)
|
|
)
|
|
diffLineNumberTooLarge(buf);
|
|
c = *p++;
|
|
}
|
|
if (c == '\r')
|
|
c = *p++;
|
|
if (c || !nlines) {
|
|
badDiffOutput(buf);
|
|
}
|
|
if (line1+nlines < line1)
|
|
diffLineNumberTooLarge(buf);
|
|
switch (buf[0]) {
|
|
case 'a':
|
|
if (line1 < dc->adprev) {
|
|
rcsfaterror("backward insertion in diff output: %s", buf);
|
|
}
|
|
dc->adprev = line1 + 1;
|
|
break;
|
|
case 'd':
|
|
if (line1 < dc->adprev || line1 < dc->dafter) {
|
|
rcsfaterror("backward deletion in diff output: %s", buf);
|
|
}
|
|
dc->adprev = line1;
|
|
dc->dafter = line1 + nlines;
|
|
break;
|
|
default:
|
|
badDiffOutput(buf);
|
|
}
|
|
if (fout) {
|
|
aprintf(fout, "%s\n", buf);
|
|
}
|
|
dc->line1 = line1;
|
|
dc->nlines = nlines;
|
|
return buf[0] == 'a';
|
|
}
|
|
|
|
|
|
|
|
#ifdef SYNTEST
|
|
|
|
/* Input an RCS file and print its internal data structures. */
|
|
|
|
char const cmdid[] = "syntest";
|
|
|
|
int
|
|
main(argc,argv)
|
|
int argc; char * argv[];
|
|
{
|
|
|
|
if (argc<2) {
|
|
aputs("No input file\n",stderr);
|
|
exitmain(EXIT_FAILURE);
|
|
}
|
|
if (!(finptr = Iopen(argv[1], FOPEN_R, (struct stat*)0))) {
|
|
faterror("can't open input file %s", argv[1]);
|
|
}
|
|
Lexinit();
|
|
getadmin();
|
|
fdlock = STDOUT_FILENO;
|
|
putadmin();
|
|
|
|
gettree();
|
|
|
|
getdesc(true);
|
|
|
|
nextlex();
|
|
|
|
if (!eoflex()) {
|
|
fatserror("expecting EOF");
|
|
}
|
|
exitmain(EXIT_SUCCESS);
|
|
}
|
|
|
|
void exiterr() { _exit(EXIT_FAILURE); }
|
|
|
|
#endif
|