6458ae9cdf
Split the merge sort so that fsort() can pass the 'FILE *' of the temporary files to be merged into the merge code. Don't rely on realloc() not moving the end address of a buffer! Rework merge sort so that it sorts pointers to 'struct mfile' and only copies about sort record descriptors. No functional change intended.
368 lines
10 KiB
C
368 lines
10 KiB
C
/* $NetBSD: msort.c,v 1.27 2009/09/26 21:16:55 dsl Exp $ */
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/*-
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* Copyright (c) 2000-2003 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Ben Harris and Jaromir Dolecek.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE 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 BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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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. 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: msort.c,v 1.27 2009/09/26 21:16:55 dsl Exp $");
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__SCCSID("@(#)msort.c 8.1 (Berkeley) 6/6/93");
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#endif /* not lint */
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <util.h>
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/* Subroutines using comparisons: merge sort and check order */
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#define DELETE (1)
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typedef struct mfile {
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FILE *fp;
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get_func_t get;
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RECHEADER *rec;
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u_char *end;
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} MFILE;
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static int cmp(RECHEADER *, RECHEADER *);
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static int insert(struct mfile **, struct mfile *, int, int);
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/*
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* Number of files merge() can merge in one pass.
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* This should be power of two so that it's possible to use this value
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* for rouding.
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*/
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#define MERGE_FNUM 16
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static struct mfile fstack[MERGE_FNUM];
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static int fstack_count;
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void
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save_for_merge(FILE *fp, get_func_t get, struct field *ftbl)
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{
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FILE *mfp;
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if (fstack_count == MERGE_FNUM) {
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/* Must reduce the number of temporary files */
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mfp = ftmp();
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merge_sort(mfp, putrec, ftbl);
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fstack[0].fp = mfp;
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fstack[0].get = geteasy;
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fstack_count = 1;
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}
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fstack[fstack_count].fp = fp;
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fstack[fstack_count++].get = get;
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}
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void
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fmerge(struct filelist *filelist, int nfiles, FILE *outfp, struct field *ftbl)
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{
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get_func_t get = SINGL_FLD ? makeline : makekey;
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FILE *fp;
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int i;
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for (i = 0; i < nfiles; i++) {
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fp = fopen(filelist->names[i], "r");
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if (fp == NULL)
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err(2, "%s", filelist->names[i]);
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save_for_merge(fp, get, ftbl);
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}
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merge_sort(outfp, putline, ftbl);
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}
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void
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merge_sort(FILE *outfp, put_func_t put, struct field *ftbl)
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{
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struct mfile *flistb[MERGE_FNUM], **flist = flistb, *cfile;
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RECHEADER *new_rec;
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u_char *new_end;
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void *tmp;
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int c, i, nfiles;
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size_t sz;
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/* Read one record from each file (read again if a duplicate) */
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for (nfiles = i = 0; i < fstack_count; i++) {
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cfile = &fstack[i];
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if (cfile->rec == NULL) {
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cfile->rec = emalloc(DEFLLEN);
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cfile->end = (u_char *)cfile->rec + DEFLLEN;
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}
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rewind(cfile->fp);
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for (;;) {
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c = cfile->get(cfile->fp, cfile->rec, cfile->end, ftbl);
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if (c == EOF)
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break;
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if (c == BUFFEND) {
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/* Double buffer size */
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sz = (cfile->end - (u_char *)cfile->rec) * 2;
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cfile->rec = erealloc(cfile->rec, sz);
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cfile->end = (u_char *)cfile->rec + sz;
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continue;
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}
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if (nfiles != 0) {
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if (insert(flist, cfile, nfiles, !DELETE))
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/* Duplicate removed */
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continue;
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} else
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flist[0] = cfile;
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nfiles++;
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break;
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}
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}
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if (nfiles == 0)
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return;
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/*
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* We now loop reading a new record from the file with the
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* 'sorted first' existing record.
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* As each record is added, the 'first' record is written to the
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* output file - maintaining one record from each file in the sorted
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* list.
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*/
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new_rec = emalloc(DEFLLEN);
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new_end = (u_char *)new_rec + DEFLLEN;
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for (;;) {
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cfile = flist[0];
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c = cfile->get(cfile->fp, new_rec, new_end, ftbl);
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if (c == EOF) {
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/* Write out last record from now-empty input */
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put(cfile->rec, outfp);
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if (--nfiles == 0)
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break;
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/* Replace from file with now-first sorted record. */
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/* (Moving base 'flist' saves copying everything!) */
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flist++;
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continue;
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}
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if (c == BUFFEND) {
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/* Buffer not large enough - double in size */
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sz = (new_end - (u_char *)new_rec) * 2;
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new_rec = erealloc(new_rec, sz);
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new_end = (u_char *)new_rec +sz;
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continue;
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}
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/* Swap in new buffer, saving old */
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tmp = cfile->rec;
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cfile->rec = new_rec;
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new_rec = tmp;
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tmp = cfile->end;
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cfile->end = new_end;
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new_end = tmp;
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/* Add into sort, removing the original first entry */
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c = insert(flist, cfile, nfiles, DELETE);
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if (c != 0 || (UNIQUE && cfile == flist[0]
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&& cmp(new_rec, cfile->rec) == 0)) {
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/* Was an unwanted duplicate, restore buffer */
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tmp = cfile->rec;
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cfile->rec = new_rec;
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new_rec = tmp;
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tmp = cfile->end;
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cfile->end = new_end;
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new_end = tmp;
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continue;
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}
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/* Write out 'old' record */
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put(new_rec, outfp);
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}
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free(new_rec);
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}
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/*
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* if delete: inserts rec in flist, deletes flist[0];
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* otherwise just inserts *rec in flist.
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* Returns 1 if record is a duplicate to be ignored.
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*/
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static int
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insert(struct mfile **flist, struct mfile *rec, int ttop, int delete)
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{
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int mid, top = ttop, bot = 0, cmpv = 1;
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for (mid = top / 2; bot + 1 != top; mid = (bot + top) / 2) {
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cmpv = cmp(rec->rec, flist[mid]->rec);
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if (cmpv == 0 ) {
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if (UNIQUE)
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/* Duplicate key, read another record */
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/* NB: This doesn't guarantee to keep any
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* particular record. */
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return 1;
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/*
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* Apply sort by input file order.
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* We could truncate the sort is the fileno are
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* adjacent - but that is all too hard!
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* The fileno cannot be equal, since we only have one
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* record from each file (+ flist[0] which never
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* comes here).
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*/
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cmpv = rec < flist[mid] ? -1 : 1;
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if (REVERSE)
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cmpv = -cmpv;
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}
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if (cmpv < 0)
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top = mid;
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else
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bot = mid;
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}
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/* At this point we haven't yet compared against flist[0] */
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if (delete) {
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/* flist[0] is ourselves, only the caller knows the old data */
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if (bot != 0) {
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memmove(flist, flist + 1, bot * sizeof(MFILE *));
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flist[bot] = rec;
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}
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return 0;
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}
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/* Inserting original set of records */
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if (bot == 0 && cmpv != 0) {
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/* Doesn't match flist[1], must compare with flist[0] */
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cmpv = cmp(rec->rec, flist[0]->rec);
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if (cmpv == 0 && UNIQUE)
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return 1;
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/* Add matching keys in file order (ie new is later) */
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if (cmpv < 0)
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bot = -1;
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}
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bot++;
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memmove(flist + bot + 1, flist + bot, (ttop - bot) * sizeof(MFILE *));
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flist[bot] = rec;
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return 0;
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}
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/*
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* check order on one file
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*/
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void
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order(struct filelist *filelist, struct field *ftbl)
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{
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get_func_t get = SINGL_FLD ? makeline : makekey;
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RECHEADER *crec, *prec, *trec;
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u_char *crec_end, *prec_end, *trec_end;
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FILE *fp;
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int c;
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fp = fopen(filelist->names[0], "r");
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if (fp == NULL)
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err(2, "%s", filelist->names[0]);
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crec = malloc(offsetof(RECHEADER, data[DEFLLEN]));
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crec_end = crec->data + DEFLLEN;
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prec = malloc(offsetof(RECHEADER, data[DEFLLEN]));
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prec_end = prec->data + DEFLLEN;
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/* XXX this does exit(0) for overlong lines */
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if (get(fp, prec, prec_end, ftbl) != 0)
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exit(0);
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while (get(fp, crec, crec_end, ftbl) == 0) {
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if (0 < (c = cmp(prec, crec))) {
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crec->data[crec->length-1] = 0;
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errx(1, "found disorder: %s", crec->data+crec->offset);
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}
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if (UNIQUE && !c) {
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crec->data[crec->length-1] = 0;
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errx(1, "found non-uniqueness: %s",
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crec->data+crec->offset);
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}
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/*
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* Swap pointers so that this record is on place pointed
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* to by prec and new record is read to place pointed to by
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* crec.
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*/
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trec = prec;
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prec = crec;
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crec = trec;
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trec_end = prec_end;
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prec_end = crec_end;
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crec_end = trec_end;
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}
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exit(0);
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}
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static int
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cmp(RECHEADER *rec1, RECHEADER *rec2)
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{
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int len;
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int r;
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/* key is weights */
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len = min(rec1->keylen, rec2->keylen);
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r = memcmp(rec1->data, rec2->data, len);
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if (r == 0)
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r = rec1->keylen - rec2->keylen;
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if (REVERSE)
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r = -r;
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return r;
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}
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