373 lines
8.9 KiB
C
373 lines
8.9 KiB
C
/* $NetBSD: files.c,v 1.17 2001/05/15 11:18:23 jdolecek Exp $ */
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/*-
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* Copyright (c) 1993
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* The Regents of the University of California. 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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* Peter McIlroy.
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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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#include "sort.h"
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#include "fsort.h"
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#ifndef lint
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__RCSID("$NetBSD: files.c,v 1.17 2001/05/15 11:18:23 jdolecek Exp $");
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__SCCSID("@(#)files.c 8.1 (Berkeley) 6/6/93");
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#endif /* not lint */
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#include <string.h>
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static int seq __P((FILE *, DBT *, DBT *));
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/*
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* this is the subroutine for file management for fsort().
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* It keeps the buffers for all temporary files.
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*/
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int
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getnext(binno, infl0, filelist, nfiles, pos, end, dummy)
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int binno, infl0;
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struct filelist *filelist;
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int nfiles;
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RECHEADER *pos;
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u_char *end;
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struct field *dummy;
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{
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int i;
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u_char *hp;
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static size_t nleft = 0;
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static int cnt = 0, flag = -1;
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static u_char maxb = 0;
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static FILE *fp;
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if (nleft == 0) {
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if (binno < 0) /* reset files. */ {
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for (i = 0; i < nfiles; i++) {
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rewind(fstack[infl0 + i].fp);
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fstack[infl0 + i].max_o = 0;
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}
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flag = -1;
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nleft = cnt = 0;
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return (-1);
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}
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maxb = fstack[infl0].maxb;
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for (; nleft == 0; cnt++) {
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if (cnt >= nfiles) {
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cnt = 0;
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return (EOF);
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}
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fp = fstack[infl0 + cnt].fp;
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fread(&nleft, sizeof(nleft), 1, fp);
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if (binno < maxb)
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fstack[infl0+cnt].max_o
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+= sizeof(nleft) + nleft;
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else if (binno == maxb) {
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if (binno != fstack[infl0].lastb) {
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fseek(fp, fstack[infl0+
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cnt].max_o, SEEK_SET);
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fread(&nleft, sizeof(nleft), 1, fp);
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}
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if (nleft == 0)
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fclose(fp);
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} else if (binno == maxb + 1) { /* skip a bin */
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fseek(fp, nleft, SEEK_CUR);
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fread(&nleft, sizeof(nleft), 1, fp);
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flag = cnt;
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}
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}
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}
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if ((u_char *) pos > end - sizeof(TRECHEADER))
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return (BUFFEND);
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fread(pos, sizeof(TRECHEADER), 1, fp);
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if (end - pos->data < pos->length) {
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hp = ((u_char *)pos) + sizeof(TRECHEADER);
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for (i = sizeof(TRECHEADER); i ; i--)
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ungetc(*--hp, fp);
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return (BUFFEND);
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}
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fread(pos->data, pos->length, 1, fp);
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nleft -= pos->length + sizeof(TRECHEADER);
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if (nleft == 0 && binno == fstack[infl0].maxb)
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fclose(fp);
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return (0);
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}
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/*
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* this is called when there is no special key. It's only called
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* in the first fsort pass.
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*/
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int
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makeline(flno, top, filelist, nfiles, recbuf, bufend, dummy2)
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int flno, top;
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struct filelist *filelist;
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int nfiles;
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RECHEADER *recbuf;
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u_char *bufend;
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struct field *dummy2;
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{
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static u_char *obufend;
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static size_t osz;
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char *pos;
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static int filenum = 0, overflow = 0;
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static FILE *fp = 0;
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int c;
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pos = (char *) recbuf->data;
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if (overflow) {
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/*
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* Buffer shortage is solved by either of two ways:
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* o flush previous buffered data and start using the
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* buffer from start (see fsort())
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* o realloc buffer and bump bufend
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*
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* The former is preferred, realloc is only done when
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* there is exactly one item in buffer which does not fit.
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*/
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if (bufend == obufend)
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memmove(pos, bufend - osz, osz);
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pos += osz;
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overflow = 0;
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}
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for (;;) {
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if (flno >= 0 && (fp = fstack[flno].fp) == NULL)
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return (EOF);
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else if (fp == NULL) {
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if (filenum >= nfiles)
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return (EOF);
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if (!(fp = fopen(filelist->names[filenum], "r")))
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err(2, "%s", filelist->names[filenum]);
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filenum++;
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}
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while ((pos < (char *)bufend) && ((c = getc(fp)) != EOF)) {
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if ((*pos++ = c) == REC_D) {
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recbuf->offset = 0;
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recbuf->length = pos - (char *) recbuf->data;
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return (0);
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}
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}
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if (pos >= (char *)bufend) {
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if (recbuf->data < bufend) {
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overflow = 1;
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obufend = bufend;
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osz = (pos - (char *) recbuf->data);
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}
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return (BUFFEND);
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} else if (c == EOF) {
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if (recbuf->data != (u_char *) pos) {
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*pos++ = REC_D;
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recbuf->offset = 0;
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recbuf->length = pos - (char *) recbuf->data;
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return (0);
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}
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FCLOSE(fp);
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fp = 0;
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if (flno >= 0)
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fstack[flno].fp = 0;
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} else {
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warnx("makeline: line too long: ignoring '%.100s...'", recbuf->data);
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/* Consume the rest of line from input */
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while((c = getc(fp)) != REC_D && c != EOF)
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;
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recbuf->offset = 0;
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recbuf->length = 0;
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return (BUFFEND);
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}
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}
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}
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/*
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* This generates keys. It's only called in the first fsort pass
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*/
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int
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makekey(flno, top, filelist, nfiles, recbuf, bufend, ftbl)
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int flno, top;
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struct filelist *filelist;
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int nfiles;
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RECHEADER *recbuf;
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u_char *bufend;
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struct field *ftbl;
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{
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static int filenum = 0;
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static FILE *dbdesc = 0;
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static DBT dbkey[1], line[1];
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static int overflow = 0;
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int c;
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if (overflow) {
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overflow = enterkey(recbuf, line, bufend - (u_char *)recbuf,
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ftbl);
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if (overflow)
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return (BUFFEND);
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else
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return (0);
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}
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for (;;) {
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if (flno >= 0) {
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if (!(dbdesc = fstack[flno].fp))
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return (EOF);
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} else if (!dbdesc) {
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if (filenum >= nfiles)
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return (EOF);
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dbdesc = fopen(filelist->names[filenum], "r");
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if (!dbdesc)
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err(2, "%s", filelist->names[filenum]);
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filenum++;
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}
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if (!(c = seq(dbdesc, line, dbkey))) {
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if ((signed)line->size > bufend - recbuf->data) {
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overflow = 1;
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} else {
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overflow = enterkey(recbuf, line,
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bufend - (u_char *) recbuf, ftbl);
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}
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if (overflow)
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return (BUFFEND);
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else
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return (0);
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}
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if (c == EOF) {
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FCLOSE(dbdesc);
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dbdesc = 0;
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if (flno >= 0)
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fstack[flno].fp = 0;
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} else {
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((char *) line->data)[60] = '\000';
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warnx("makekey: line too long: ignoring %.100s...",
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(char *)line->data);
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}
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}
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}
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/*
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* get a key/line pair from fp
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*/
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static int
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seq(fp, line, key)
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FILE *fp;
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DBT *key, *line;
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{
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static char *buf, flag = 1;
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char *end, *pos;
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int c;
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if (flag) {
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flag = 0;
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buf = (char *) linebuf;
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end = buf + linebuf_size;
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line->data = buf;
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}
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pos = buf;
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while ((c = getc(fp)) != EOF) {
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if ((*pos++ = c) == REC_D) {
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line->size = pos - buf;
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return (0);
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}
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if (pos == end) {
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linebuf_size *= 2;
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linebuf = realloc(linebuf, linebuf_size);
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if (!linebuf)
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err(2, "realloc of linebuf to %lu bytes failed",
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(unsigned long)linebuf_size);
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end = linebuf + linebuf_size;
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pos = linebuf + (pos - buf);
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line->data = buf = (char *)linebuf;
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continue;
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}
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}
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if (pos != buf) {
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*pos++ = REC_D;
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line->size = pos - buf;
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return (0);
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} else
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return (EOF);
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}
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/*
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* write a key/line pair to a temporary file
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*/
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void
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putrec(rec, fp)
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const RECHEADER *rec;
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FILE *fp;
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{
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EWRITE(rec, 1, rec->length + sizeof(TRECHEADER), fp);
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}
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/*
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* write a line to output
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*/
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void
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putline(rec, fp)
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const RECHEADER *rec;
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FILE *fp;
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{
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EWRITE(rec->data+rec->offset, 1, rec->length - rec->offset, fp);
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}
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/*
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* get a record from a temporary file. (Used by merge sort.)
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*/
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int
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geteasy(flno, top, filelist, nfiles, rec, end, dummy2)
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int flno, top;
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struct filelist *filelist;
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int nfiles;
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RECHEADER *rec;
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u_char *end;
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struct field *dummy2;
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{
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int i;
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FILE *fp;
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fp = fstack[flno].fp;
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if ((u_char *) rec > end - sizeof(TRECHEADER))
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return (BUFFEND);
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if (!fread(rec, 1, sizeof(TRECHEADER), fp)) {
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fclose(fp);
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fstack[flno].fp = 0;
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return (EOF);
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}
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if (end - rec->data < rec->length) {
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for (i = sizeof(TRECHEADER) - 1; i >= 0; i--)
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ungetc(*((char *) rec + i), fp);
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return (BUFFEND);
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}
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fread(rec->data, rec->length, 1, fp);
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return (0);
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}
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