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NetBSD/usr.bin/sort/msort.c

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/* $NetBSD: msort.c,v 1.2 2000/10/07 18:37:10 bjh21 Exp $ */
/*-
* Copyright (c) 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Peter McIlroy.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "sort.h"
#include "fsort.h"
#ifndef lint
__RCSID("$NetBSD: msort.c,v 1.2 2000/10/07 18:37:10 bjh21 Exp $");
__SCCSID("@(#)msort.c 8.1 (Berkeley) 6/6/93");
#endif /* not lint */
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
/* Subroutines using comparisons: merge sort and check order */
#define DELETE (1)
#define LALIGN(n) ((n+3) & ~3)
typedef struct mfile {
u_char *end;
short flno;
struct recheader rec[1];
} MFILE;
typedef struct tmfile {
u_char *end;
short flno;
struct trecheader rec[1];
} TMFILE;
u_char *wts, *wts1 = 0;
struct mfile *cfilebuf;
static int cmp __P((struct recheader *, struct recheader *));
static int insert __P((struct mfile **, struct mfile **, int, int));
void
fmerge(binno, files, nfiles, get, outfd, fput, ftbl)
union f_handle files;
int binno, nfiles;
int (*get) __P((int, union f_handle, int, struct recheader *, u_char *,
struct field *));
FILE *outfd;
void (*fput) __P((struct recheader *, FILE *));
struct field *ftbl;
{
FILE *tout;
int i, j, last;
void (*put)(struct recheader *, FILE *);
struct tempfile *l_fstack;
wts = ftbl->weights;
if (!UNIQUE && SINGL_FLD && ftbl->flags & F)
wts1 = (ftbl->flags & R) ? Rascii : ascii;
if (!cfilebuf)
cfilebuf = malloc(MAXLLEN + sizeof(TMFILE));
i = min(16, nfiles) * LALIGN(MAXLLEN+sizeof(TMFILE));
if (!buffer || i > BUFSIZE) {
buffer = buffer ? realloc(buffer, i) : malloc(i);
if (!buffer)
err(2, NULL);
if (!SINGL_FLD)
linebuf = malloc(MAXLLEN);
}
if (binno >= 0)
l_fstack = fstack + files.top;
else
l_fstack = fstack;
while (nfiles) {
put = putrec;
for (j = 0; j < nfiles; j += 16) {
if (nfiles <= 16) {
tout = outfd;
put = fput;
}
else
tout = ftmp();
last = min(16, nfiles - j);
if (binno < 0) {
for (i = 0; i < last; i++)
if (!(l_fstack[i+MAXFCT-1-16].fd =
fopen(files.names[j + i], "r")))
err(2, "%s", files.names[j+i]);
merge(MAXFCT-1-16, last, get, tout, put, ftbl);
}
else {
for (i = 0; i< last; i++)
rewind(l_fstack[i+j].fd);
merge(files.top+j, last, get, tout, put, ftbl);
}
if (nfiles > 16) l_fstack[j/16].fd = tout;
}
nfiles = (nfiles + 15) / 16;
if (nfiles == 1)
nfiles = 0;
if (binno < 0) {
binno = 0;
get = geteasy;
files.top = 0;
}
}
}
void
merge(infl0, nfiles, get, outfd, put, ftbl)
int infl0, nfiles;
int (*get) __P((int, union f_handle, int, struct recheader *, u_char *,
struct field *));
void (*put)(struct recheader *, FILE *);
FILE *outfd;
struct field *ftbl;
{
int c, i, j;
union f_handle dummy = {0};
struct mfile *flist[16], *cfile;
for (i = j = 0; i < nfiles; i++) {
cfile = (MFILE *) (buffer +
i * LALIGN(MAXLLEN + sizeof(TMFILE)));
cfile->flno = j + infl0;
cfile->end = cfile->rec->data + MAXLLEN;
for (c = 1; c == 1;) {
if (EOF == (c = get(j+infl0, dummy, nfiles,
cfile->rec, cfile->end, ftbl))) {
--i;
--nfiles;
break;
}
if (i)
c = insert(flist, &cfile, i, !DELETE);
else
flist[0] = cfile;
}
j++;
}
cfile = cfilebuf;
cfile->flno = flist[0]->flno;
cfile->end = cfile->rec->data + MAXLLEN;
while (nfiles) {
for (c = 1; c == 1;) {
if (EOF == (c = get(cfile->flno, dummy, nfiles,
cfile->rec, cfile->end, ftbl))) {
put(flist[0]->rec, outfd);
memmove(flist, flist + 1,
sizeof(MFILE *) * (--nfiles));
cfile->flno = flist[0]->flno;
break;
}
if (!(c = insert(flist, &cfile, nfiles, DELETE)))
put(cfile->rec, outfd);
}
}
}
/*
* if delete: inserts *rec in flist, deletes flist[0], and leaves it in *rec;
* otherwise just inserts *rec in flist.
*/
static int
insert(flist, rec, ttop, delete)
struct mfile **flist, **rec;
int delete, ttop; /* delete = 0 or 1 */
{
register struct mfile *tmprec;
register int top, mid, bot = 0, cmpv = 1;
tmprec = *rec;
top = ttop;
for (mid = top/2; bot +1 != top; mid = (bot+top)/2) {
cmpv = cmp(tmprec->rec, flist[mid]->rec);
if (cmpv < 0)
top = mid;
else if (cmpv > 0)
bot = mid;
else {
if (!UNIQUE)
bot = mid - 1;
break;
}
}
if (delete) {
if (UNIQUE) {
if (!bot && cmpv)
cmpv = cmp(tmprec->rec, flist[0]->rec);
if (!cmpv)
return(1);
}
tmprec = flist[0];
if (bot)
memmove(flist, flist+1, bot * sizeof(MFILE **));
flist[bot] = *rec;
*rec = tmprec;
(*rec)->flno = (*flist)->flno;
return (0);
}
else {
if (!bot && !(UNIQUE && !cmpv)) {
cmpv = cmp(tmprec->rec, flist[0]->rec);
if (cmpv < 0)
bot = -1;
}
if (UNIQUE && !cmpv)
return (1);
bot++;
memmove(flist + bot+1, flist + bot,
(ttop - bot) * sizeof(MFILE **));
flist[bot] = *rec;
return (0);
}
}
/*
* check order on one file
*/
void
order(infile, get, ftbl)
union f_handle infile;
int (*get) __P((int, union f_handle, int, struct recheader *, u_char *,
struct field *));
struct field *ftbl;
{
u_char *end;
int c;
struct recheader *crec, *prec, *trec;
if (!SINGL_FLD)
linebuf = malloc(MAXLLEN);
buffer = malloc(2 * (MAXLLEN + sizeof(TRECHEADER)));
end = buffer + 2 * (MAXLLEN + sizeof(TRECHEADER));
crec = (RECHEADER *) buffer;
prec = (RECHEADER *) (buffer + MAXLLEN + sizeof(TRECHEADER));
wts = ftbl->weights;
if (SINGL_FLD && ftbl->flags & F)
wts1 = ftbl->flags & R ? Rascii : ascii;
else
wts1 = 0;
if (0 == get(-1, infile, 1, prec, end, ftbl))
while (0 == get(-1, infile, 1, crec, end, ftbl)) {
if (0 < (c = cmp(prec, crec))) {
crec->data[crec->length-1] = 0;
errx(1, "found disorder: %s", crec->data+crec->offset);
}
if (UNIQUE && !c) {
crec->data[crec->length-1] = 0;
errx(1, "found non-uniqueness: %s",
crec->data+crec->offset);
}
trec = prec;
prec = crec;
crec = trec;
}
exit(0);
}
static int
cmp(rec1, rec2)
struct recheader *rec1, *rec2;
{
register int r;
register u_char *pos1, *pos2, *end;
register u_char *cwts;
for (cwts = wts; cwts; cwts = (cwts == wts1 ? 0 : wts1)) {
pos1 = rec1->data;
pos2 = rec2->data;
if (!SINGL_FLD && UNIQUE)
end = pos1 + min(rec1->offset, rec2->offset);
else
end = pos1 + min(rec1->length, rec2->length);
for (; pos1 < end; ) {
if ((r = cwts[*pos1++] - cwts[*pos2++]))
return (r);
}
}
return (0);
}
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