minix/lib/libc/citrus/citrus_csmapper.c

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/* $NetBSD: citrus_csmapper.c,v 1.10 2009/01/11 02:46:24 christos Exp $ */
/*-
* Copyright (c)2003 Citrus Project,
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: citrus_csmapper.c,v 1.10 2009/01/11 02:46:24 christos Exp $");
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include "reentrant.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <paths.h>
#include <sys/types.h>
#include <sys/queue.h>
#include "citrus_namespace.h"
#include "citrus_types.h"
#include "citrus_bcs.h"
#include "citrus_region.h"
#include "citrus_memstream.h"
#include "citrus_mmap.h"
#include "citrus_module.h"
#include "citrus_hash.h"
#include "citrus_mapper.h"
#include "citrus_csmapper.h"
#include "citrus_pivot_file.h"
#include "citrus_db.h"
#include "citrus_db_hash.h"
#include "citrus_lookup.h"
#ifdef _REENTRANT
static rwlock_t lock = RWLOCK_INITIALIZER;
#endif
static struct _citrus_mapper_area *maparea = NULL;
#define CS_ALIAS _PATH_CSMAPPER "/charset.alias"
#define CS_PIVOT _PATH_CSMAPPER "/charset.pivot"
/* ---------------------------------------------------------------------- */
static int
get32(struct _region *r, uint32_t *rval)
{
if (_region_size(r) != 4)
return EFTYPE;
memcpy(rval, _region_head(r), (size_t)4);
*rval = be32toh(*rval);
return 0;
}
static int
open_subdb(struct _citrus_db **subdb, struct _citrus_db *db, const char *src)
{
int ret;
struct _region r;
ret = _db_lookup_by_s(db, src, &r, NULL);
if (ret)
return ret;
ret = _db_open(subdb, &r, _CITRUS_PIVOT_SUB_MAGIC, _db_hash_std, NULL);
if (ret)
return ret;
return 0;
}
#define NO_SUCH_FILE EOPNOTSUPP
static int
find_best_pivot_pvdb(const char *src, const char *dst, char *pivot,
size_t pvlen, unsigned long *rnorm)
{
int ret, num, i;
struct _region fr, r1, r2;
struct _citrus_db *db1, *db2, *db3;
char buf[LINE_MAX];
unsigned long norm;
uint32_t val32;
ret = _map_file(&fr, CS_PIVOT ".pvdb");
if (ret) {
if (ret == ENOENT)
ret = NO_SUCH_FILE;
return ret;
}
ret = _db_open(&db1, &fr, _CITRUS_PIVOT_MAGIC, _db_hash_std, NULL);
if (ret)
goto quit1;
ret = open_subdb(&db2, db1, src);
if (ret)
goto quit2;
num = _db_get_num_entries(db2);
*rnorm = ULONG_MAX;
for (i = 0; i < num; i++) {
/* iterate each pivot */
ret = _db_get_entry(db2, i, &r1, &r2);
if (ret)
goto quit3;
/* r1:pivot name, r2:norm among src and pivot */
ret = get32(&r2, &val32);
if (ret)
goto quit3;
norm = val32;
snprintf(buf, sizeof(buf), "%.*s",
(int)_region_size(&r1), (char *)_region_head(&r1));
/* buf: pivot name */
ret = open_subdb(&db3, db1, buf);
if (ret)
goto quit3;
if (_db_lookup_by_s(db3, dst, &r2, NULL) != 0)
goto quit4;
/* r2: norm among pivot and dst */
ret = get32(&r2, &val32);
if (ret)
goto quit4;
norm += val32;
/* judge minimum norm */
if (norm < *rnorm) {
*rnorm = norm;
strlcpy(pivot, buf, pvlen);
}
quit4:
_db_close(db3);
if (ret)
goto quit3;
}
quit3:
_db_close(db2);
quit2:
_db_close(db1);
quit1:
_unmap_file(&fr);
if (ret)
return ret;
if (*rnorm == ULONG_MAX)
return ENOENT;
return 0;
}
/* ---------------------------------------------------------------------- */
struct zone {
const char *begin, *end;
};
struct parse_arg {
char dst[PATH_MAX];
unsigned long norm;
};
static int
parse_line(struct parse_arg *pa, struct _region *r)
{
char buf[20];
struct zone z1, z2;
size_t len;
len = _region_size(r);
z1.begin = _bcs_skip_ws_len(_region_head(r), &len);
if (len == 0)
return EFTYPE;
z1.end = _bcs_skip_nonws_len(z1.begin, &len);
if (len == 0)
return EFTYPE;
z2.begin = _bcs_skip_ws_len(z1.end, &len);
if (len == 0)
return EFTYPE;
z2.end = _bcs_skip_nonws_len(z2.begin, &len);
/* z1 : dst name, z2 : norm */
snprintf(pa->dst, sizeof(pa->dst),
"%.*s", (int)(z1.end-z1.begin), z1.begin);
snprintf(buf, sizeof(buf),
"%.*s", (int)(z2.end-z2.begin), z2.begin);
pa->norm = _bcs_strtoul(buf, NULL, 0);
return 0;
}
static int
find_dst(struct parse_arg *pasrc, const char *dst)
{
int ret;
struct parse_arg padst;
struct _lookup *cl;
struct _region data;
ret = _lookup_seq_open(&cl, CS_PIVOT, _LOOKUP_CASE_IGNORE);
if (ret)
return ret;
ret = _lookup_seq_lookup(cl, pasrc->dst, &data);
while (ret == 0) {
ret = parse_line(&padst, &data);
if (ret)
break;
if (strcmp(dst, padst.dst) == 0) {
pasrc->norm += padst.norm;
break;
}
ret = _lookup_seq_next(cl, NULL, &data);
}
_lookup_seq_close(cl);
return ret;
}
static int
find_best_pivot_lookup(const char *src, const char *dst, char *pivot,
size_t pvlen, unsigned long *rnorm)
{
int ret;
struct _lookup *cl;
struct _region data;
struct parse_arg pa;
unsigned long norm_min;
char pivot_min[PATH_MAX];
ret = _lookup_seq_open(&cl, CS_PIVOT, _LOOKUP_CASE_IGNORE);
if (ret)
return ret;
norm_min = ULONG_MAX;
/* find pivot code */
ret = _lookup_seq_lookup(cl, src, &data);
while (ret == 0) {
ret = parse_line(&pa, &data);
if (ret)
break;
ret = find_dst(&pa, dst);
if (ret)
break;
if (pa.norm < norm_min) {
norm_min = pa.norm;
strlcpy(pivot_min, pa.dst, sizeof(pivot_min));
}
ret = _lookup_seq_next(cl, NULL, &data);
}
_lookup_seq_close(cl);
if (ret != ENOENT)
return ret;
if (norm_min == ULONG_MAX)
return ENOENT;
strlcpy(pivot, pivot_min, pvlen);
if (rnorm)
*rnorm = norm_min;
return 0;
}
static int
find_best_pivot(const char *src, const char *dst, char *pivot, size_t pvlen,
unsigned long *rnorm)
{
int ret;
ret = find_best_pivot_pvdb(src, dst, pivot, pvlen, rnorm);
if (ret == NO_SUCH_FILE)
ret = find_best_pivot_lookup(src, dst, pivot, pvlen, rnorm);
return ret;
}
static __inline int
open_serial_mapper(struct _citrus_mapper_area *__restrict ma,
struct _citrus_mapper * __restrict * __restrict rcm,
const char *src, const char *pivot, const char *dst)
{
char buf[PATH_MAX];
snprintf(buf, sizeof(buf), "%s/%s,%s/%s", src, pivot, pivot, dst);
return _mapper_open_direct(ma, rcm, "mapper_serial", buf);
}
static struct _citrus_csmapper *csm_none = NULL;
static int
get_none(struct _citrus_mapper_area *__restrict ma,
struct _citrus_csmapper *__restrict *__restrict rcsm)
{
int ret;
rwlock_wrlock(&lock);
if (csm_none) {
*rcsm = csm_none;
ret = 0;
goto quit;
}
ret = _mapper_open_direct(ma, &csm_none, "mapper_none", "");
if (ret)
goto quit;
_mapper_set_persistent(csm_none);
*rcsm = csm_none;
ret = 0;
quit:
rwlock_unlock(&lock);
return ret;
}
int
_citrus_csmapper_open(struct _citrus_csmapper * __restrict * __restrict rcsm,
const char * __restrict src, const char * __restrict dst,
uint32_t flags, unsigned long *rnorm)
{
int ret;
char buf1[PATH_MAX], buf2[PATH_MAX], key[PATH_MAX], pivot[PATH_MAX];
const char *realsrc, *realdst;
unsigned long norm;
norm = 0; /* XXX gcc */
ret = _citrus_mapper_create_area(&maparea, _PATH_CSMAPPER);
if (ret)
return ret;
realsrc = _lookup_alias(CS_ALIAS, src, buf1, sizeof(buf1),
_LOOKUP_CASE_IGNORE);
realdst = _lookup_alias(CS_ALIAS, dst, buf2, sizeof(buf2),
_LOOKUP_CASE_IGNORE);
if (!strcmp(realsrc, realdst)) {
ret = get_none(maparea, rcsm);
if (ret == 0 && rnorm != NULL)
*rnorm = 0;
return ret;
}
snprintf(key, sizeof(key), "%s/%s", realsrc, realdst);
ret = _mapper_open(maparea, rcsm, key);
if (ret == 0) {
if (rnorm != NULL)
*rnorm = 0;
return 0;
}
if (ret != ENOENT || (flags & _CSMAPPER_F_PREVENT_PIVOT)!=0)
return ret;
ret = find_best_pivot(realsrc, realdst, pivot, sizeof(pivot), &norm);
if (ret)
return ret;
ret = open_serial_mapper(maparea, rcsm, realsrc, pivot, realdst);
if (ret == 0 && rnorm != NULL)
*rnorm = norm;
return ret;
}