port/locale/strcoll.c

4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore/*
2d08521bd15501c8370ba2153b9cca4f094979d0Garrett D'Amore * Copyright 2013 Garrett D'Amore <garrett@damore.org>
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore * Copyright 2010 Nexenta Systems, Inc.  All rights reserved.
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore * Copyright (c) 1995 Alex Tatmanjants <alex@elvisti.kiev.ua>
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore *      at Electronni Visti IA, Kiev, Ukraine.
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore *          All rights reserved.
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore *
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore * Redistribution and use in source and binary forms, with or without
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore * modification, are permitted provided that the following conditions
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore * are met:
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore * 1. Redistributions of source code must retain the above copyright
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore *    notice, this list of conditions and the following disclaimer.
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore * 2. Redistributions in binary form must reproduce the above copyright
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore *    notice, this list of conditions and the following disclaimer in the
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore *    documentation and/or other materials provided with the distribution.
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore *
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore * SUCH DAMAGE.
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore */
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore#include "lint.h"
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore#include "file64.h"
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore#include <alloca.h>
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore#include <stdlib.h>
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore#include <string.h>
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore#include <errno.h>
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore#include <wchar.h>
2d08521bd15501c8370ba2153b9cca4f094979d0Garrett D'Amore#include <xlocale.h>
2d08521bd15501c8370ba2153b9cca4f094979d0Garrett D'Amore#include "localeimpl.h"
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore#include "collate.h"
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore#define ALLOCA_LIMIT    16
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore/*
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore * In order to properly handle multibyte locales, its easiet to just
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore * convert to wide characters and then use wcscoll.  However if an
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore * error occurs, we gracefully fall back to simple strcmp.  Caller
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore * should check errno.
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore */
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amoreint
2d08521bd15501c8370ba2153b9cca4f094979d0Garrett D'Amorestrcoll_l(const char *s1, const char *s2, locale_t loc)
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore{
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore    int ret;
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore    wchar_t *t1 = NULL, *t2 = NULL;
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore    wchar_t *w1 = NULL, *w2 = NULL;
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore    size_t sz1, sz2;
2d08521bd15501c8370ba2153b9cca4f094979d0Garrett D'Amore    const struct lc_collate *lcc = loc->collate;
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore
2d08521bd15501c8370ba2153b9cca4f094979d0Garrett D'Amore    if (lcc->lc_is_posix)
2d08521bd15501c8370ba2153b9cca4f094979d0Garrett D'Amore        return (strcmp(s1, s2));
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore    sz1 = strlen(s1) + 1;
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore    sz2 = strlen(s2) + 1;
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore    /*
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore     * Simple assumption: conversion to wide format is strictly
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore     * reducing, i.e. a single byte (or multibyte character)
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore     * cannot result in multiple wide characters.
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore     *
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore     * We gain a bit of performance by giving preference to alloca
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore     * for small string allocations.
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore     */
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore    if (sz1 > ALLOCA_LIMIT) {
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore        if ((t1 = malloc(sz1 * sizeof (wchar_t))) == NULL)
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore            goto error;
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore        w1 = t1;
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore    } else {
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore        if ((w1 = alloca(sz1 * sizeof (wchar_t))) == NULL)
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore            goto error;
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore    }
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore    if (sz2 > ALLOCA_LIMIT) {
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore        if ((t2 = malloc(sz2 * sizeof (wchar_t))) == NULL)
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore            goto error;
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore        w2 = t2;
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore    } else {
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore        if ((w2 = alloca(sz2 * sizeof (wchar_t))) == NULL)
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore            goto error;
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore    }
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore
83ff55dcd7fc7c3356d7b2d3f67ec99970728d9bRichard Lowe    if ((mbstowcs_l(w1, s1, sz1, loc)) == (size_t)-1)
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore        goto error;
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore
83ff55dcd7fc7c3356d7b2d3f67ec99970728d9bRichard Lowe    if ((mbstowcs_l(w2, s2, sz2, loc)) == (size_t)-1)
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore        goto error;
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore
2d08521bd15501c8370ba2153b9cca4f094979d0Garrett D'Amore    ret = wcscoll_l(w1, w2, loc);
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore    if (t1)
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore        free(t1);
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore    if (t2)
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore        free(t2);
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore    return (ret);
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amoreerror:
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore    if (t1)
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore        free(t1);
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore    if (t2)
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore        free(t2);
6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648Garrett D'Amore    return (strcmp(s1, s2));
4297a3b0d0a35d80f86fff155e288e885a100e6dGarrett D'Amore}
2d08521bd15501c8370ba2153b9cca4f094979d0Garrett D'Amore
2d08521bd15501c8370ba2153b9cca4f094979d0Garrett D'Amoreint
2d08521bd15501c8370ba2153b9cca4f094979d0Garrett D'Amorestrcoll(const char *s1, const char *s2)
2d08521bd15501c8370ba2153b9cca4f094979d0Garrett D'Amore{
2d08521bd15501c8370ba2153b9cca4f094979d0Garrett D'Amore    return (strcoll_l(s1, s2, uselocale(NULL)));
2d08521bd15501c8370ba2153b9cca4f094979d0Garrett D'Amore}