This patch contains changes to NetBSD libc code base to make it compile and work on Minix. Some of them are due to actual NetBSD libc bugs, as we're compiling it in non-reentrant mode and with a.out support, something not exactly frequent in NetBSD. Others are proper fixes to port it to Minix (mostly sa_len parameter missing in socket and a few mmap from files).
261 lines
6.7 KiB
C
261 lines
6.7 KiB
C
/* $NetBSD: cdbr.c,v 1.2 2010/06/03 12:40:52 veego Exp $ */
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/*-
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* Copyright (c) 2010 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 Joerg Sonnenberger.
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* 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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#if HAVE_NBTOOL_CONFIG_H
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#include "nbtool_config.h"
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#endif
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: cdbr.c,v 1.2 2010/06/03 12:40:52 veego Exp $");
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#include "namespace.h"
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#include <sys/bitops.h>
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#include <sys/endian.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <cdbr.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <inttypes.h>
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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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#ifdef __weak_alias
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__weak_alias(cdbr_close,_cdbr_close)
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__weak_alias(cdbr_find,_cdbr_find)
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__weak_alias(cdbr_get,_cdbr_get)
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__weak_alias(cdbr_open,_cdbr_open)
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#endif
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struct cdbr {
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uint8_t *mmap_base;
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size_t mmap_size;
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uint8_t *hash_base;
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uint8_t *offset_base;
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uint8_t *data_base;
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uint32_t data_size;
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uint32_t entries;
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uint32_t entries_index;
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uint32_t seed;
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uint8_t offset_size;
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uint8_t index_size;
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uint32_t entries_m;
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uint32_t entries_index_m;
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uint8_t entries_s1, entries_s2;
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uint8_t entries_index_s1, entries_index_s2;
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};
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/* ARGSUSED */
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struct cdbr *
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cdbr_open(const char *path, int flags)
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{
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uint8_t buf[40];
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int fd;
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struct cdbr *cdbr;
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struct stat sb;
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if ((fd = open(path, O_RDONLY)) == -1)
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return NULL;
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errno = EINVAL;
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if (fstat(fd, &sb) == -1 ||
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read(fd, buf, sizeof(buf)) != sizeof(buf) ||
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memcmp(buf, "NBCDB\n\0\001", 8) ||
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(cdbr = malloc(sizeof(*cdbr))) == NULL) {
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close(fd);
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return NULL;
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}
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cdbr->data_size = le32dec(buf + 24);
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cdbr->entries = le32dec(buf + 28);
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cdbr->entries_index = le32dec(buf + 32);
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cdbr->seed = le32dec(buf + 36);
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if (cdbr->data_size < 0x100)
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cdbr->offset_size = 1;
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else if (cdbr->data_size < 0x10000)
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cdbr->offset_size = 2;
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else
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cdbr->offset_size = 4;
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if (cdbr->entries_index < 0x100)
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cdbr->index_size = 1;
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else if (cdbr->entries_index < 0x10000)
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cdbr->index_size = 2;
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else
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cdbr->index_size = 4;
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cdbr->mmap_size = (size_t)sb.st_size;
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#ifdef __minix
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cdbr->mmap_base = mmap(NULL, cdbr->mmap_size, PROT_READ, MAP_ANON, -1, (off_t)0);
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if (cdbr->mmap_base == MAP_FAILED) {
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free(cdbr);
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return NULL;
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}
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if (read(fd, cdbr->mmap_base, cdbr->mmap_size) != cdbr->mmap_size)
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{
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munmap(cdbr->mmap_base, cdbr->mmap_size);
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free(cdbr);
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return NULL;
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}
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#else /* !__minix */
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cdbr->mmap_base = mmap(NULL, cdbr->mmap_size, PROT_READ, MAP_FILE|MAP_SHARED, fd, 0);
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#endif /* __minix */
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close(fd);
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if (cdbr->mmap_base == MAP_FAILED) {
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free(cdbr);
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return NULL;
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}
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cdbr->hash_base = cdbr->mmap_base + 40;
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cdbr->offset_base = cdbr->hash_base + cdbr->entries_index * cdbr->index_size;
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if (cdbr->entries_index * cdbr->index_size % cdbr->offset_size)
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cdbr->offset_base += cdbr->offset_size -
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cdbr->entries_index * cdbr->index_size % cdbr->offset_size;
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cdbr->data_base = cdbr->offset_base + (cdbr->entries + 1) * cdbr->offset_size;
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if (cdbr->hash_base < cdbr->mmap_base ||
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cdbr->offset_base < cdbr->mmap_base ||
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cdbr->data_base < cdbr->mmap_base ||
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cdbr->data_base + cdbr->data_size < cdbr->mmap_base ||
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cdbr->data_base + cdbr->data_size >
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cdbr->mmap_base + cdbr->mmap_size ||
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cdbr->entries == 0 || cdbr->entries_index == 0) {
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errno = EINVAL;
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cdbr_close(cdbr);
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return NULL;
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}
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fast_divide32_prepare(cdbr->entries, &cdbr->entries_m,
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&cdbr->entries_s1, &cdbr->entries_s2);
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fast_divide32_prepare(cdbr->entries_index, &cdbr->entries_index_m,
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&cdbr->entries_index_s1, &cdbr->entries_index_s2);
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return cdbr;
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}
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static inline uint32_t
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get_uintX(const uint8_t *addr, uint32_t idx, int size)
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{
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addr += idx * size;
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if (size == 4)
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return /* LINTED */le32toh(*(const uint32_t *)addr);
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else if (size == 2)
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return /* LINTED */le16toh(*(const uint16_t *)addr);
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else
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return *addr;
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}
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uint32_t
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cdbr_entries(struct cdbr *cdbr)
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{
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return cdbr->entries;
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}
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int
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cdbr_get(struct cdbr *cdbr, uint32_t idx, const void **data, size_t *data_len)
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{
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uint32_t start, end;
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if (idx >= cdbr->entries) {
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errno = EINVAL;
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return -1;
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}
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start = get_uintX(cdbr->offset_base, idx, cdbr->offset_size);
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end = get_uintX(cdbr->offset_base, idx + 1, cdbr->offset_size);
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if (start > end) {
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errno = EIO;
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return -1;
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}
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if (end > cdbr->data_size) {
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errno = EIO;
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return -1;
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}
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*data = cdbr->data_base + start;
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*data_len = end - start;
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return 0;
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}
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int
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cdbr_find(struct cdbr *cdbr, const void *key, size_t key_len,
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const void **data, size_t *data_len)
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{
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uint32_t hashes[3], idx;
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if (cdbr->entries_index == 0) {
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errno = EINVAL;
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return -1;
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}
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mi_vector_hash(key, key_len, cdbr->seed, hashes);
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hashes[0] = fast_remainder32(hashes[0], cdbr->entries_index,
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cdbr->entries_index_m, cdbr->entries_index_s1,
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cdbr->entries_index_s2);
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hashes[1] = fast_remainder32(hashes[1], cdbr->entries_index,
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cdbr->entries_index_m, cdbr->entries_index_s1,
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cdbr->entries_index_s2);
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hashes[2] = fast_remainder32(hashes[2], cdbr->entries_index,
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cdbr->entries_index_m, cdbr->entries_index_s1,
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cdbr->entries_index_s2);
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idx = get_uintX(cdbr->hash_base, hashes[0], cdbr->index_size);
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idx += get_uintX(cdbr->hash_base, hashes[1], cdbr->index_size);
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idx += get_uintX(cdbr->hash_base, hashes[2], cdbr->index_size);
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return cdbr_get(cdbr, fast_remainder32(idx, cdbr->entries,
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cdbr->entries_m, cdbr->entries_s1, cdbr->entries_s2), data,
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data_len);
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}
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void
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cdbr_close(struct cdbr *cdbr)
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{
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munmap(cdbr->mmap_base, cdbr->mmap_size);
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free(cdbr);
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}
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