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Initial revision
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Gunnar Ritter
177
ex_tagio.c
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177
ex_tagio.c
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/* Copyright (c) 1985 Regents of the University of California */
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/*
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* These routines are for faster tag lookup. They support the binary
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* search used in tagfind() instead of the linear search. The speedup
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* is quite noticable looking for a tag at the end of a long tags
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* file. Define FASTTAG in the Makefile to use these routines.
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*
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* This code contains changes by
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* Gunnar Ritter, Freiburg i. Br., Germany, 2002. All rights reserved.
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*
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* Conditions 1, 2, and 4 and the no-warranty notice below apply
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* to these changes.
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*
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*
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* Copyright (c) 1980, 1993
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* The Regents of the University of California. All rights reserved.
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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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*
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* Copyright(C) Caldera International Inc. 2001-2002. All rights reserved.
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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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* Redistributions of source code and documentation must retain the
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* above copyright notice, this list of conditions and the following
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* disclaimer.
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* 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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* 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 or owned by Caldera
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* International, Inc.
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* Neither the name of Caldera International, Inc. nor the names of
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* other contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
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* INTERNATIONAL, INC. AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL CALDERA INTERNATIONAL, INC. BE
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* LIABLE FOR ANY DIRECT, INDIRECT INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef FASTTAG
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#ifndef lint
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#ifdef DOSCCS
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static char sccsid[] = "@(#)ex_tagio.c 1.11 (gritter) 11/27/04";
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#endif
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#endif
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/* from ex_tagio.c 7.3 (Berkeley) 1/31/86 */
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#include "ex.h"
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static long offset = -1;
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static long block = -1;
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static int bcnt = 0;
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static int b_size = MAXBSIZE;
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static char *ibuf;
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int
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topen(char *file, char *buf)
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{
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int fd;
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struct stat statb;
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offset = -1;
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block = -1;
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if ((fd = open(file, O_RDONLY, 0)) < 0)
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return(-1);
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if (fstat(fd, &statb) < 0) {
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close(fd);
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return(-1);
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}
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ibuf = buf;
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if (statb.st_blksize <= MAXBSIZE)
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b_size = statb.st_blksize;
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return(fd);
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}
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int
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tseek(int fd, off_t off)
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{
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off_t nblock;
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nblock = off / b_size * b_size;
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offset = off % b_size;
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if (nblock == block)
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return(0);
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block = nblock;
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if (lseek(fd, (off_t) nblock, SEEK_SET) < 0)
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return(-1);
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if ((bcnt = read(fd, ibuf, b_size)) < 0)
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return(-1);
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return(0);
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}
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int
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tgets(register char *buf, int cnt, int fd)
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{
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register char *cp;
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register int cc;
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cc = offset;
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if (cc == -1) {
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if ((bcnt = read(fd, ibuf, b_size)) <= 0)
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return 0;
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cc = 0;
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block = 0;
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}
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if (bcnt == 0) /* EOF */
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return 0;
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cp = ibuf + cc;
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while (--cnt > 0) {
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if (++cc > bcnt) {
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block += b_size;
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if ((bcnt = read(fd, ibuf, b_size)) <= 0) {
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offset = cc;
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return 0;
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}
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cp = ibuf;
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cc = 1;
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}
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if ((*buf++ = *cp++) == '\n')
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break;
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}
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*--buf = 0;
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offset = cc;
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return(1);
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}
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void
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tclose(int fd)
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{
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close(fd);
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offset = -1;
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block = -1;
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bcnt = 0;
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}
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#endif
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