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582 lines
16 KiB
C
582 lines
16 KiB
C
/*-
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* Copyright (c) 2002 Juli Mallett.
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* Copyright (c) 1988, 1989, 1990, 1993
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 1989 by Berkeley Softworks
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Adam de Boor.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)var.c 8.3 (Berkeley) 3/19/94
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include "buf.h"
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#include "config.h"
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#include "str.h"
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#include "util.h"
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#include "var.h"
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/*-
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*-----------------------------------------------------------------------
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* VarHead --
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* Remove the tail of the given word and place the result in the given
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* buffer.
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*
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* Results:
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* TRUE if characters were added to the buffer (a space needs to be
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* added to the buffer before the next word).
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*
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* Side Effects:
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* The trimmed word is added to the buffer.
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*
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*-----------------------------------------------------------------------
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*/
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Boolean
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VarHead(const char *word, Boolean addSpace, Buffer *buf, void *dummy __unused)
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{
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char *slash;
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slash = strrchr(word, '/');
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if (slash != NULL) {
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if (addSpace) {
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Buf_AddByte(buf, (Byte)' ');
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}
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Buf_AddBytes(buf, slash - word, (const Byte *)word);
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} else {
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/*
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* If no directory part, give . (q.v. the POSIX standard)
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*/
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if (addSpace) {
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Buf_AddBytes(buf, 2, (const Byte *)" .");
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} else {
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Buf_AddByte(buf, (Byte)'.');
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}
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}
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return (TRUE);
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}
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/*-
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*-----------------------------------------------------------------------
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* VarTail --
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* Remove the head of the given word and place the result in the given
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* buffer.
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*
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* Results:
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* TRUE if characters were added to the buffer (a space needs to be
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* added to the buffer before the next word).
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*
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* Side Effects:
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* The trimmed word is added to the buffer.
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*
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*-----------------------------------------------------------------------
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*/
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Boolean
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VarTail(const char *word, Boolean addSpace, Buffer *buf, void *dummy __unused)
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{
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const char *slash;
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if (addSpace) {
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Buf_AddByte (buf, (Byte)' ');
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}
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slash = strrchr(word, '/');
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if (slash != NULL) {
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slash++;
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Buf_AddBytes(buf, strlen(slash), (const Byte *)slash);
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} else {
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Buf_AddBytes(buf, strlen(word), (const Byte *)word);
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}
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return (TRUE);
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}
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/*-
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*-----------------------------------------------------------------------
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* VarSuffix --
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* Place the suffix of the given word in the given buffer.
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*
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* Results:
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* TRUE if characters were added to the buffer (a space needs to be
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* added to the buffer before the next word).
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*
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* Side Effects:
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* The suffix from the word is placed in the buffer.
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*
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*-----------------------------------------------------------------------
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*/
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Boolean
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VarSuffix(const char *word, Boolean addSpace, Buffer *buf, void *dummy __unused)
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{
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const char *dot;
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dot = strrchr(word, '.');
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if (dot != NULL) {
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if (addSpace) {
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Buf_AddByte(buf, (Byte)' ');
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}
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dot++;
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Buf_AddBytes(buf, strlen(dot), (const Byte *)dot);
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addSpace = TRUE;
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}
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return (addSpace);
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}
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/*-
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*-----------------------------------------------------------------------
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* VarRoot --
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* Remove the suffix of the given word and place the result in the
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* buffer.
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*
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* Results:
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* TRUE if characters were added to the buffer (a space needs to be
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* added to the buffer before the next word).
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*
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* Side Effects:
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* The trimmed word is added to the buffer.
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*
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*-----------------------------------------------------------------------
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*/
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Boolean
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VarRoot(const char *word, Boolean addSpace, Buffer *buf, void *dummy __unused)
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{
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char *dot;
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if (addSpace) {
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Buf_AddByte(buf, (Byte)' ');
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}
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dot = strrchr(word, '.');
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if (dot != NULL) {
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Buf_AddBytes(buf, dot - word, (const Byte *)word);
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} else {
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Buf_AddBytes(buf, strlen(word), (const Byte *)word);
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}
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return (TRUE);
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}
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/*-
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*-----------------------------------------------------------------------
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* VarMatch --
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* Place the word in the buffer if it matches the given pattern.
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* Callback function for VarModify to implement the :M modifier.
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* A space will be added if requested. A pattern is supplied
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* which the word must match.
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*
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* Results:
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* TRUE if a space should be placed in the buffer before the next
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* word.
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*
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* Side Effects:
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* The word may be copied to the buffer.
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*
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*-----------------------------------------------------------------------
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*/
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Boolean
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VarMatch(const char *word, Boolean addSpace, Buffer *buf, void *pattern)
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{
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if (Str_Match(word, pattern)) {
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if (addSpace) {
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Buf_AddByte(buf, (Byte)' ');
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}
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addSpace = TRUE;
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Buf_AddBytes(buf, strlen(word), word);
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}
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return (addSpace);
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}
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#ifdef SYSVVARSUB
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/*-
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*-----------------------------------------------------------------------
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* VarSYSVMatch --
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* Place the word in the buffer if it matches the given pattern.
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* Callback function for VarModify to implement the System V %
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* modifiers. A space is added if requested.
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*
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* Results:
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* TRUE if a space should be placed in the buffer before the next
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* word.
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*
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* Side Effects:
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* The word may be copied to the buffer.
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*
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*-----------------------------------------------------------------------
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*/
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Boolean
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VarSYSVMatch(const char *word, Boolean addSpace, Buffer *buf, void *patp)
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{
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int len;
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const char *ptr;
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VarPattern *pat = (VarPattern *)patp;
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if (addSpace)
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Buf_AddByte(buf, (Byte)' ');
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addSpace = TRUE;
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if ((ptr = Str_SYSVMatch(word, pat->lhs, &len)) != NULL)
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Str_SYSVSubst(buf, pat->rhs, ptr, len);
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else
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Buf_AddBytes(buf, strlen(word), (const Byte *)word);
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return (addSpace);
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}
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#endif
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/*-
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*-----------------------------------------------------------------------
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* VarNoMatch --
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* Place the word in the buffer if it doesn't match the given pattern.
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* Callback function for VarModify to implement the :N modifier. A
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* space is added if requested.
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*
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* Results:
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* TRUE if a space should be placed in the buffer before the next
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* word.
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*
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* Side Effects:
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* The word may be copied to the buffer.
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*
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*-----------------------------------------------------------------------
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*/
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Boolean
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VarNoMatch(const char *word, Boolean addSpace, Buffer *buf, void *pattern)
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{
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if (!Str_Match(word, pattern)) {
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if (addSpace) {
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Buf_AddByte(buf, (Byte)' ');
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}
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addSpace = TRUE;
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Buf_AddBytes(buf, strlen(word), (const Byte *)word);
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}
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return (addSpace);
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}
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/*-
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*-----------------------------------------------------------------------
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* VarSubstitute --
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* Perform a string-substitution on the given word, placing the
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* result in the passed buffer. A space is added if requested.
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*
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* Results:
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* TRUE if a space is needed before more characters are added.
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*
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* Side Effects:
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* None.
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*
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*-----------------------------------------------------------------------
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*/
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Boolean
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VarSubstitute(const char *word, Boolean addSpace, Buffer *buf, void *patternp)
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{
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size_t wordLen; /* Length of word */
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const char *cp; /* General pointer */
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VarPattern *pattern = patternp;
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wordLen = strlen(word);
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if (1) { /* substitute in each word of the variable */
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/*
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* Break substitution down into simple anchored cases
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* and if none of them fits, perform the general substitution case.
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*/
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if ((pattern->flags & VAR_MATCH_START) &&
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(strncmp(word, pattern->lhs, pattern->leftLen) == 0)) {
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/*
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* Anchored at start and beginning of word matches pattern
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*/
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if ((pattern->flags & VAR_MATCH_END) &&
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(wordLen == pattern->leftLen)) {
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/*
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* Also anchored at end and matches to the end (word
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* is same length as pattern) add space and rhs only
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* if rhs is non-null.
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*/
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if (pattern->rightLen != 0) {
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if (addSpace) {
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Buf_AddByte(buf, (Byte)' ');
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}
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addSpace = TRUE;
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Buf_AddBytes(buf, pattern->rightLen,
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(Byte *)pattern->rhs);
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}
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} else if (pattern->flags & VAR_MATCH_END) {
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/*
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* Doesn't match to end -- copy word wholesale
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*/
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goto nosub;
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} else {
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/*
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* Matches at start but need to copy in trailing characters
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*/
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if ((pattern->rightLen + wordLen - pattern->leftLen) != 0){
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if (addSpace) {
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Buf_AddByte(buf, (Byte)' ');
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}
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addSpace = TRUE;
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}
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Buf_AddBytes(buf, pattern->rightLen, (Byte *)pattern->rhs);
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Buf_AddBytes(buf, wordLen - pattern->leftLen,
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(const Byte *)(word + pattern->leftLen));
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}
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} else if (pattern->flags & VAR_MATCH_START) {
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/*
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* Had to match at start of word and didn't -- copy whole word.
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*/
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goto nosub;
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} else if (pattern->flags & VAR_MATCH_END) {
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/*
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* Anchored at end, Find only place match could occur (leftLen
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* characters from the end of the word) and see if it does. Note
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* that because the $ will be left at the end of the lhs, we have
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* to use strncmp.
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*/
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cp = word + (wordLen - pattern->leftLen);
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if ((cp >= word) &&
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(strncmp(cp, pattern->lhs, pattern->leftLen) == 0)) {
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/*
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* Match found. If we will place characters in the buffer,
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* add a space before hand as indicated by addSpace, then
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* stuff in the initial, unmatched part of the word followed
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* by the right-hand-side.
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*/
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if (((cp - word) + pattern->rightLen) != 0) {
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if (addSpace) {
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Buf_AddByte(buf, (Byte)' ');
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}
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addSpace = TRUE;
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}
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Buf_AddBytes(buf, cp - word, (const Byte *)word);
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Buf_AddBytes(buf, pattern->rightLen, (Byte *)pattern->rhs);
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} else {
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/*
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* Had to match at end and didn't. Copy entire word.
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*/
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goto nosub;
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}
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} else {
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/*
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* Pattern is unanchored: search for the pattern in the word using
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* strstr(3), copying unmatched portions and the
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* right-hand-side for each match found, handling non-global
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* substitutions correctly, etc. When the loop is done, any
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* remaining part of the word (word and wordLen are adjusted
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* accordingly through the loop) is copied straight into the
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* buffer.
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* addSpace is set FALSE as soon as a space is added to the
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* buffer.
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*/
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Boolean done;
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size_t origSize;
|
|
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done = FALSE;
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origSize = Buf_Size(buf);
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while (!done) {
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cp = strstr(word, pattern->lhs);
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if (cp != NULL) {
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if (addSpace && (((cp - word) + pattern->rightLen) != 0)){
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Buf_AddByte(buf, (Byte)' ');
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addSpace = FALSE;
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}
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Buf_AddBytes(buf, cp-word, (const Byte *)word);
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Buf_AddBytes(buf, pattern->rightLen, (Byte *)pattern->rhs);
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wordLen -= (cp - word) + pattern->leftLen;
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word = cp + pattern->leftLen;
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if (wordLen == 0 || (pattern->flags & VAR_SUB_GLOBAL) == 0){
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done = TRUE;
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}
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} else {
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done = TRUE;
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|
}
|
|
}
|
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if (wordLen != 0) {
|
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if (addSpace) {
|
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Buf_AddByte(buf, (Byte)' ');
|
|
}
|
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Buf_AddBytes(buf, wordLen, (const Byte *)word);
|
|
}
|
|
/*
|
|
* If added characters to the buffer, need to add a space
|
|
* before we add any more. If we didn't add any, just return
|
|
* the previous value of addSpace.
|
|
*/
|
|
return ((Buf_Size(buf) != origSize) || addSpace);
|
|
}
|
|
/*
|
|
* Common code for anchored substitutions:
|
|
* addSpace was set TRUE if characters were added to the buffer.
|
|
*/
|
|
return (addSpace);
|
|
}
|
|
nosub:
|
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if (addSpace) {
|
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Buf_AddByte(buf, (Byte)' ');
|
|
}
|
|
Buf_AddBytes(buf, wordLen, (const Byte *)word);
|
|
return (TRUE);
|
|
}
|
|
|
|
/*-
|
|
*-----------------------------------------------------------------------
|
|
* VarRESubstitute --
|
|
* Perform a regex substitution on the given word, placing the
|
|
* result in the passed buffer. A space is added if requested.
|
|
*
|
|
* Results:
|
|
* TRUE if a space is needed before more characters are added.
|
|
*
|
|
* Side Effects:
|
|
* None.
|
|
*
|
|
*-----------------------------------------------------------------------
|
|
*/
|
|
Boolean
|
|
VarRESubstitute(const char *word, Boolean addSpace, Buffer *buf, void *patternp)
|
|
{
|
|
VarREPattern *pat;
|
|
int xrv;
|
|
const char *wp;
|
|
char *rp;
|
|
int added;
|
|
int flags = 0;
|
|
|
|
#define MAYBE_ADD_SPACE() \
|
|
if (addSpace && !added) \
|
|
Buf_AddByte(buf, (Byte)' '); \
|
|
added = 1
|
|
|
|
added = 0;
|
|
wp = word;
|
|
pat = patternp;
|
|
|
|
if ((pat->flags & (VAR_SUB_ONE | VAR_SUB_MATCHED)) ==
|
|
(VAR_SUB_ONE | VAR_SUB_MATCHED))
|
|
xrv = REG_NOMATCH;
|
|
else {
|
|
tryagain:
|
|
xrv = regexec(&pat->re, wp, pat->nsub, pat->matches, flags);
|
|
}
|
|
|
|
switch (xrv) {
|
|
case 0:
|
|
pat->flags |= VAR_SUB_MATCHED;
|
|
if (pat->matches[0].rm_so > 0) {
|
|
MAYBE_ADD_SPACE();
|
|
Buf_AddBytes(buf, pat->matches[0].rm_so, (const Byte *)wp);
|
|
}
|
|
|
|
for (rp = pat->replace; *rp; rp++) {
|
|
if ((*rp == '\\') && ((rp[1] == '&') || (rp[1] == '\\'))) {
|
|
MAYBE_ADD_SPACE();
|
|
Buf_AddByte(buf, (Byte)rp[1]);
|
|
rp++;
|
|
}
|
|
else if ((*rp == '&') ||
|
|
((*rp == '\\') && isdigit((unsigned char)rp[1]))) {
|
|
int n;
|
|
const char *subbuf;
|
|
int sublen;
|
|
char errstr[3];
|
|
|
|
if (*rp == '&') {
|
|
n = 0;
|
|
errstr[0] = '&';
|
|
errstr[1] = '\0';
|
|
} else {
|
|
n = rp[1] - '0';
|
|
errstr[0] = '\\';
|
|
errstr[1] = rp[1];
|
|
errstr[2] = '\0';
|
|
rp++;
|
|
}
|
|
|
|
if (n > pat->nsub) {
|
|
Error("No subexpression %s", &errstr[0]);
|
|
subbuf = "";
|
|
sublen = 0;
|
|
} else if ((pat->matches[n].rm_so == -1) &&
|
|
(pat->matches[n].rm_eo == -1)) {
|
|
Error("No match for subexpression %s", &errstr[0]);
|
|
subbuf = "";
|
|
sublen = 0;
|
|
} else {
|
|
subbuf = wp + pat->matches[n].rm_so;
|
|
sublen = pat->matches[n].rm_eo - pat->matches[n].rm_so;
|
|
}
|
|
|
|
if (sublen > 0) {
|
|
MAYBE_ADD_SPACE();
|
|
Buf_AddBytes(buf, sublen, (const Byte *)subbuf);
|
|
}
|
|
} else {
|
|
MAYBE_ADD_SPACE();
|
|
Buf_AddByte(buf, (Byte)*rp);
|
|
}
|
|
}
|
|
wp += pat->matches[0].rm_eo;
|
|
if (pat->flags & VAR_SUB_GLOBAL) {
|
|
flags |= REG_NOTBOL;
|
|
if (pat->matches[0].rm_so == 0 && pat->matches[0].rm_eo == 0) {
|
|
MAYBE_ADD_SPACE();
|
|
Buf_AddByte(buf, (Byte)*wp);
|
|
wp++;
|
|
|
|
}
|
|
if (*wp)
|
|
goto tryagain;
|
|
}
|
|
if (*wp) {
|
|
MAYBE_ADD_SPACE();
|
|
Buf_AddBytes(buf, strlen(wp), (const Byte *)wp);
|
|
}
|
|
break;
|
|
default:
|
|
VarREError(xrv, &pat->re, "Unexpected regex error");
|
|
/* fall through */
|
|
case REG_NOMATCH:
|
|
if (*wp) {
|
|
MAYBE_ADD_SPACE();
|
|
Buf_AddBytes(buf, strlen(wp), (const Byte *)wp);
|
|
}
|
|
break;
|
|
}
|
|
return (addSpace || added);
|
|
}
|