1310aa04b4
This frees a byte value to use for 'end of key' (to correctly sort short keys) while still having a weight assigned to the field sep. (Unless -t is given, the field sep is in the field data.) Do reverse sorts by writing the output file in reverse order (rather than reversing the sort - apart from merges). All key compares are now unweighted. For 'sort -u' mark duplicates keys during the sort and don't write to the output. Use -S to mean a posix sort - where equal keys are sorted using the raw record (rather than being kept in the original order). For 'sort -f' (no keys) generate a key of the folded data (as for -n -i and -d), simplifies the code and allows a 'posix' sort.
197 lines
6.3 KiB
C
197 lines
6.3 KiB
C
/* $NetBSD: fsort.c,v 1.41 2009/09/10 22:02:40 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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/*
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* Read in a block of records (until 'enough').
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* sort, write to temp file.
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* Merge sort temp files into output file
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* Small files miss out the temp file stage.
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* Large files might get multiple merges.
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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: fsort.c,v 1.41 2009/09/10 22:02:40 dsl Exp $");
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__SCCSID("@(#)fsort.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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struct tempfile fstack[MAXFCT];
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#define SALIGN(n) ((n+sizeof(length_t)-1) & ~(sizeof(length_t)-1))
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void
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fsort(struct filelist *filelist, int nfiles, FILE *outfp, struct field *ftbl)
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{
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RECHEADER **keylist;
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RECHEADER **keypos, **keyp;
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RECHEADER *buffer;
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size_t bufsize = DEFBUFSIZE;
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u_char *bufend;
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int mfct = 0;
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int c, nelem;
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get_func_t get;
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RECHEADER *crec;
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RECHEADER *nbuffer;
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FILE *fp;
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buffer = malloc(bufsize);
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bufend = (u_char *)buffer + bufsize;
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/* Allocate double length keymap for radix_sort */
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keylist = malloc(2 * MAXNUM * sizeof(*keylist));
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if (buffer == NULL || keylist == NULL)
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err(2, "failed to malloc initial buffer or keylist");
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if (SINGL_FLD)
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/* Key and data are one! */
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get = makeline;
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else
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/* Key (merged key fields) added before data */
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get = makekey;
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/* Loop through reads of chunk of input files that get sorted
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* and then merged together. */
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for (;;) {
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keypos = keylist;
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nelem = 0;
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crec = buffer;
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/* Loop reading records */
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for (;;) {
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c = get(-1, 0, filelist, nfiles, crec, bufend, ftbl);
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/* 'c' is 0, EOF or BUFFEND */
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if (c == 0) {
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/* Save start of key in input buffer */
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*keypos++ = crec;
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if (++nelem == MAXNUM) {
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c = BUFFEND;
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break;
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}
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crec = (RECHEADER *)(crec->data + SALIGN(crec->length));
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continue;
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}
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if (c == EOF)
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break;
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if (nelem >= MAXNUM || bufsize >= MAXBUFSIZE)
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/* Need to sort and save this lot of data */
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break;
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/* c == BUFFEND, and we can process more data */
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/* Allocate a larger buffer for this lot of data */
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bufsize *= 2;
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nbuffer = realloc(buffer, bufsize);
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if (!nbuffer) {
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err(2, "failed to realloc buffer to %zu bytes",
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bufsize);
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}
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/* patch up keylist[] */
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for (keyp = &keypos[-1]; keyp >= keylist; keyp--)
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*keyp = nbuffer + (*keyp - buffer);
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crec = nbuffer + (crec - buffer);
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buffer = nbuffer;
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bufend = (u_char *)buffer + bufsize;
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}
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/* Sort this set of records */
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radix_sort(keylist, keylist + MAXNUM, nelem);
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if (c == EOF && mfct == 0) {
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/* all the data is (sorted) in the buffer */
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append(keylist, nelem, outfp,
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DEBUG('k') ? putkeydump : putline);
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break;
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}
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/* Save current data to a temporary file for a later merge */
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fp = ftmp();
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fstack[mfct].fp = fp;
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append(keylist, nelem, fp, putrec);
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mfct++;
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if (c == EOF) {
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/* merge to output file */
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fmerge(0, filelist, mfct, geteasy, outfp,
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DEBUG('k') ? putkeydump : putline, ftbl);
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break;
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}
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if (mfct == MERGE_FNUM) {
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/* Merge the files we have */
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fp = ftmp();
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fmerge(0, filelist, mfct, geteasy, fp, putrec, ftbl);
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mfct = 1;
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fstack[0].fp = fp;
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}
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}
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free(keylist);
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keylist = NULL;
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free(buffer);
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buffer = NULL;
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}
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