lib/libc/locale/ansi.c

/*-
 * Copyright (c) 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Paul Borman at Krystal Technologies.
 *
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)ansi.c      8.1 (Berkeley) 6/27/93";
#endif /* LIBC_SCCS and not lint */

#include <stdlib.h>
#include <limits.h>
#include <stddef.h>
#include <rune.h>

int
mblen(s, n)
        const char *s;
        size_t n;
{
        char const *e;

        if (s == 0 || *s == 0)
                return (0);     /* No support for state dependent encodings. */

        if (sgetrune(s, (int)n, &e) == _INVALID_RUNE)
                return (s - e);
        return (e - s);
}

int
mbtowc(pwc, s, n)
        wchar_t *pwc;
        const char *s;
        size_t n;
{
        char const *e;
        rune_t r;

        if (s == 0 || *s == 0)
                return (0);     /* No support for state dependent encodings. */

        if ((r = sgetrune(s, (int)n, &e)) == _INVALID_RUNE)
                return (s - e);
        if (pwc)
                *pwc = r;
        return (e - s);
}

int
wctomb(s, wchar)
        char *s;
        wchar_t wchar;
{
        char *e;

        if (s == 0)
                return (0);     /* No support for state dependent encodings. */

        if (wchar == 0) {
                *s = 0;
                return (1);
        }

        sputrune(wchar, s, MB_CUR_MAX, &e);
        return (e ? e - s : -1);
}

size_t
mbstowcs(pwcs, s, n)
        wchar_t *pwcs;
        const char *s;
        size_t n;
{
        char const *e;
        int cnt = 0;

        if (!pwcs || !s)
                return (-1);

        while (n-- > 0) {
                *pwcs = sgetrune(s, MB_LEN_MAX, &e);
                if (*pwcs == _INVALID_RUNE)
                        return (-1);
                if (*pwcs++ == 0)
                        break;
                s = e;
                ++cnt;
        }
        return (cnt);
}

size_t
wcstombs(s, pwcs, n)
        char *s;
        const wchar_t *pwcs;
        size_t n;
{
        char *e;
        int cnt = 0;

        if (!pwcs || !s)
                return (-1);

        while (n > 0) {
                if (*pwcs == 0) {
                        *s = 0;
                        break;
                }
                if (!sputrune(*pwcs++, s, (int)n, &e))
                        return (-1);            /* encoding error */
                if (!e)                 /* too long */
                        return (cnt);
                cnt += e - s;
                s = e;
        }
        return (cnt);
}