There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
329 lines
8.2 KiB
C
329 lines
8.2 KiB
C
/* $NetBSD: radixsort.c,v 1.19 2009/09/05 08:53:06 dsl Exp $ */
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/*-
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* Copyright (c) 1990, 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 and by Dan Bernstein at New York University,
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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 <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)radixsort.c 8.2 (Berkeley) 4/28/95";
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#else
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__RCSID("$NetBSD: radixsort.c,v 1.19 2009/09/05 08:53:06 dsl Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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/*
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* Radixsort routines.
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*
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* Program r_sort_a() is unstable but uses O(logN) extra memory for a stack.
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* Use radixsort(a, n, trace, endchar) for this case.
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*
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* For stable sorting (using N extra pointers) use sradixsort(), which calls
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* r_sort_b().
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*
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* For a description of this code, see D. McIlroy, P. McIlroy, K. Bostic,
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* "Engineering Radix Sort".
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*/
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#include "namespace.h"
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#include <sys/types.h>
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#include <assert.h>
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#include <errno.h>
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#include <stdlib.h>
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#ifdef __weak_alias
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__weak_alias(radixsort,_radixsort)
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__weak_alias(sradixsort,_sradixsort)
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#endif
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typedef struct {
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const u_char **sa;
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int sn, si;
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} stack;
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static inline void simplesort(const u_char **, int, int, const u_char *, u_int);
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static void r_sort_a(const u_char **, int, int, const u_char *, u_int);
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static void r_sort_b(const u_char **,
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const u_char **, int, int, const u_char *, u_int);
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#define THRESHOLD 20 /* Divert to simplesort(). */
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#define SIZE 512 /* Default stack size. */
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#define SETUP { \
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if (tab == NULL) { \
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tr = tr0; \
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for (c = 0; c < endch; c++) \
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tr0[c] = c + 1; \
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tr0[c] = 0; \
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for (c++; c < 256; c++) \
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tr0[c] = c; \
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endch = 0; \
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} else { \
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endch = tab[endch]; \
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tr = tab; \
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if (endch != 0 && endch != 255) { \
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errno = EINVAL; \
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return (-1); \
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} \
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} \
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}
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int
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radixsort(const u_char **a, int n, const u_char *tab, u_int endch)
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{
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const u_char *tr;
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u_int c;
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u_char tr0[256];
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_DIAGASSERT(a != NULL);
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SETUP;
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r_sort_a(a, n, 0, tr, endch);
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return (0);
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}
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int
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sradixsort(const u_char **a, int n, const u_char *tab, u_int endch)
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{
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const u_char *tr, **ta;
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u_int c;
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u_char tr0[256];
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_DIAGASSERT(a != NULL);
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if (a == NULL) {
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errno = EFAULT;
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return (-1);
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}
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SETUP;
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if (n < THRESHOLD)
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simplesort(a, n, 0, tr, endch);
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else {
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if ((ta = malloc(n * sizeof(a))) == NULL)
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return (-1);
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r_sort_b(a, ta, n, 0, tr, endch);
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free(ta);
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}
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return (0);
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}
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#define empty(s) (s >= sp)
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#define pop(a, n, i) a = (--sp)->sa, n = sp->sn, i = sp->si
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#define push(a, n, i) sp->sa = a, sp->sn = n, (sp++)->si = i
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#define swap(a, b, t) t = a, a = b, b = t
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/* Unstable, in-place sort. */
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static void
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r_sort_a(const u_char **a, int n, int i, const u_char *tr, u_int endch)
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{
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static u_int count[256], nc, bmin;
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u_int c;
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const u_char **ak, *r;
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stack s[SIZE], *sp, *sp0, *sp1, temp;
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u_int *cp, bigc;
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const u_char **an, *t, **aj, **top[256];
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_DIAGASSERT(a != NULL);
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_DIAGASSERT(tr != NULL);
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/* Set up stack. */
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sp = s;
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push(a, n, i);
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while (!empty(s)) {
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pop(a, n, i);
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if (n < THRESHOLD) {
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simplesort(a, n, i, tr, endch);
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continue;
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}
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an = a + n;
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/* Make character histogram. */
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if (nc == 0) {
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bmin = 255; /* First occupied bin, excluding eos. */
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for (ak = a; ak < an;) {
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c = tr[(*ak++)[i]];
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if (++count[c] == 1 && c != endch) {
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if (c < bmin)
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bmin = c;
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nc++;
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}
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}
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if (sp + nc > s + SIZE) { /* Get more stack. */
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r_sort_a(a, n, i, tr, endch);
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continue;
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}
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}
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/*
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* Set top[]; push incompletely sorted bins onto stack.
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* top[] = pointers to last out-of-place element in bins.
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* count[] = counts of elements in bins.
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* Before permuting: top[c-1] + count[c] = top[c];
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* during deal: top[c] counts down to top[c-1].
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*/
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sp0 = sp1 = sp; /* Stack position of biggest bin. */
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bigc = 2; /* Size of biggest bin. */
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if (endch == 0) /* Special case: set top[eos]. */
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top[0] = ak = a + count[0];
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else {
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ak = a;
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top[255] = an;
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}
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for (cp = count + bmin; nc > 0; cp++) {
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while (*cp == 0) /* Find next non-empty pile. */
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cp++;
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if (*cp > 1) {
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if (*cp > bigc) {
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bigc = *cp;
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sp1 = sp;
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}
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push(ak, *cp, i+1);
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}
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top[cp-count] = ak += *cp;
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nc--;
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}
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swap(*sp0, *sp1, temp); /* Play it safe -- biggest bin last. */
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/*
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* Permute misplacements home. Already home: everything
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* before aj, and in bin[c], items from top[c] on.
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* Inner loop:
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* r = next element to put in place;
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* ak = top[r[i]] = location to put the next element.
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* aj = bottom of 1st disordered bin.
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* Outer loop:
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* Once the 1st disordered bin is done, ie. aj >= ak,
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* aj<-aj + count[c] connects the bins in a linked list;
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* reset count[c].
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*/
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for (aj = a; aj < an; *aj = r, aj += count[c], count[c] = 0)
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for (r = *aj; aj < (ak = --top[c = tr[r[i]]]);)
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swap(*ak, r, t);
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}
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}
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/* Stable sort, requiring additional memory. */
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static void
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r_sort_b(const u_char **a, const u_char **ta, int n, int i, const u_char *tr,
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u_int endch)
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{
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static u_int count[256], nc, bmin;
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u_int c;
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const u_char **ak, **ai;
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stack s[512], *sp, *sp0, *sp1, temp;
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const u_char **top[256];
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u_int *cp, bigc;
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_DIAGASSERT(a != NULL);
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_DIAGASSERT(ta != NULL);
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_DIAGASSERT(tr != NULL);
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sp = s;
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push(a, n, i);
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while (!empty(s)) {
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pop(a, n, i);
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if (n < THRESHOLD) {
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simplesort(a, n, i, tr, endch);
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continue;
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}
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if (nc == 0) {
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bmin = 255;
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for (ak = a + n; --ak >= a;) {
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c = tr[(*ak)[i]];
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if (++count[c] == 1 && c != endch) {
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if (c < bmin)
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bmin = c;
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nc++;
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}
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}
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if (sp + nc > s + SIZE) {
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r_sort_b(a, ta, n, i, tr, endch);
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continue;
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}
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}
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sp0 = sp1 = sp;
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bigc = 2;
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if (endch == 0) {
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top[0] = ak = a + count[0];
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count[0] = 0;
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} else {
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ak = a;
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top[255] = a + n;
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count[255] = 0;
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}
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for (cp = count + bmin; nc > 0; cp++) {
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while (*cp == 0)
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cp++;
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if ((c = *cp) > 1) {
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if (c > bigc) {
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bigc = c;
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sp1 = sp;
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}
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push(ak, c, i+1);
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}
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top[cp-count] = ak += c;
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*cp = 0; /* Reset count[]. */
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nc--;
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}
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swap(*sp0, *sp1, temp);
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for (ak = ta + n, ai = a+n; ak > ta;) /* Copy to temp. */
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*--ak = *--ai;
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for (ak = ta+n; --ak >= ta;) /* Deal to piles. */
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*--top[tr[(*ak)[i]]] = *ak;
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}
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}
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/* insertion sort */
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static inline void
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simplesort(const u_char **a, int n, int b, const u_char *tr, u_int endch)
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{
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u_char ch;
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const u_char **ak, **ai, *s, *t;
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_DIAGASSERT(a != NULL);
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_DIAGASSERT(tr != NULL);
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for (ak = a+1; --n >= 1; ak++)
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for (ai = ak; ai > a; ai--) {
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for (s = ai[0] + b, t = ai[-1] + b;
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(ch = tr[*s]) != endch; s++, t++)
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if (ch != tr[*t])
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break;
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if (ch >= tr[*t])
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break;
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swap(ai[0], ai[-1], s);
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}
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}
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