port/gen/gettxt.c

	gettxt.c revision 7257d1b4d25bfac0c802847390e98a464fd787ac
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*  Copyright (c) 1988 AT&T */
/*    All Rights Reserved   */

#pragma ident   "%Z%%M% %I% %E% SMI"

#pragma weak _gettxt = gettxt

#include "lint.h"
#include "libc.h"
#include <mtlib.h>
#include <ctype.h>
#include <string.h>
#include <locale.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/file.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <pfmt.h>
#include <stdlib.h>
#include <unistd.h>
#include <limits.h>
#include <thread.h>
#include "../i18n/_locale.h"
#include "../i18n/_loc_path.h"

#define MESSAGES    "/LC_MESSAGES/"
#define DB_NAME_LEN 15

#define handle_return(s)    \
    ((char *)((s) != NULL && *(s) != '\0' ? (s) : not_found))

extern char cur_cat[];
extern rwlock_t _rw_cur_cat;

static mutex_t  gettxt_lock = DEFAULTMUTEX;
static const char   *not_found = "Message not found!!\n";
static const char   *loc_C = "C";

struct db_list {
    char    db_name[DB_NAME_LEN];   /* name of the message file */
    uintptr_t   addr;       /* virtual memory address */
    struct db_list  *next;
};

struct db_cache {
    char    *loc;
    struct db_list  *info;
    struct db_cache *next;
};

static struct db_cache  *db_cache;

char *
gettxt(const char *msg_id, const char *dflt_str)
{
    struct db_cache *dbc;
    struct db_list  *dbl;
    char    msgfile[DB_NAME_LEN];   /* name of static shared library */
    int msgnum;         /* message number */
    char    pathname[PATH_MAX]; /* full pathname to message file */
    int fd;
    struct stat64   sb;
    void    *addr;
    char    *tokp;
    size_t  name_len;
    char    *curloc;

    if ((msg_id == NULL) || (*msg_id == '\0')) {
        return (handle_return(dflt_str));
    }

    /* parse msg_id */
    if (((tokp = strchr(msg_id, ':')) == NULL) || *(tokp+1) == '\0')
        return (handle_return(dflt_str));
    if ((name_len = (tokp - msg_id)) >= DB_NAME_LEN)
        return (handle_return(dflt_str));
    if (name_len > 0) {
        (void) strncpy(msgfile, msg_id, name_len);
        msgfile[name_len] = '\0';
    } else {
        lrw_rdlock(&_rw_cur_cat);
        if (cur_cat == NULL || *cur_cat == '\0') {
            lrw_unlock(&_rw_cur_cat);
            return (handle_return(dflt_str));
        }
        /*
         * We know the following strcpy is safe.
         */
        (void) strcpy(msgfile, cur_cat);
        lrw_unlock(&_rw_cur_cat);
    }
    while (*++tokp) {
        if (!isdigit((unsigned char)*tokp))
            return (handle_return(dflt_str));
    }
    msgnum = atoi(msg_id + name_len + 1);
    curloc = setlocale(LC_MESSAGES, NULL);

    lmutex_lock(&gettxt_lock);

try_C:
    dbc = db_cache;
    while (dbc) {
        if (strcmp(curloc, dbc->loc) == 0) {
            dbl = dbc->info;
            while (dbl) {
                if (strcmp(msgfile, dbl->db_name) == 0) {
                    /* msgfile found */
                    lmutex_unlock(&gettxt_lock);
                    goto msgfile_found;
                }
                dbl = dbl->next;
            }
            /* not found */
            break;
        }
        dbc = dbc->next;
    }
    if (dbc == NULL) {
        /* new locale */
        if ((dbc = lmalloc(sizeof (struct db_cache))) == NULL) {
            lmutex_unlock(&gettxt_lock);
            return (handle_return(dflt_str));
        }
        if ((dbc->loc = lmalloc(strlen(curloc) + 1)) == NULL) {
            lfree(dbc, sizeof (struct db_cache));
            lmutex_unlock(&gettxt_lock);
            return (handle_return(dflt_str));
        }
        dbc->info = NULL;
        (void) strcpy(dbc->loc, curloc);
        /* connect dbc to the dbc list */
        dbc->next = db_cache;
        db_cache = dbc;
    }
    if ((dbl = lmalloc(sizeof (struct db_list))) == NULL) {
        lmutex_unlock(&gettxt_lock);
        return (handle_return(dflt_str));
    }

    if (snprintf(pathname, sizeof (pathname),
        _DFLT_LOC_PATH "%s" MESSAGES "%s", dbc->loc, msgfile) >=
        sizeof (pathname)) {
        lfree(dbl, sizeof (struct db_list));
        lmutex_unlock(&gettxt_lock);
        return (handle_return(dflt_str));
    }
    if ((fd = open(pathname, O_RDONLY)) == -1 ||
        fstat64(fd, &sb) == -1 ||
        (addr = mmap(NULL, (size_t)sb.st_size, PROT_READ, MAP_SHARED,
        fd, 0L)) == MAP_FAILED) {
        if (fd != -1)
            (void) close(fd);
        lfree(dbl, sizeof (struct db_list));

        if (strcmp(dbc->loc, "C") == 0) {
            lmutex_unlock(&gettxt_lock);
            return (handle_return(dflt_str));
        }
        /* Change locale to C */
        curloc = (char *)loc_C;
        goto try_C;
    }
    (void) close(fd);

    /* save file name, memory address, fd and size */
    (void) strcpy(dbl->db_name, msgfile);
    dbl->addr = (uintptr_t)addr;

    /* connect dbl to the dbc->info list */
    dbl->next = dbc->info;
    dbc->info = dbl;

    lmutex_unlock(&gettxt_lock);

msgfile_found:
    /* check if msgnum out of domain */
    if (msgnum <= 0 || msgnum > *(int *)dbl->addr)
        return (handle_return(dflt_str));
    /* return pointer to message */
    return ((char *)(dbl->addr +
        *(int *)(dbl->addr + msgnum * sizeof (int))));
}