/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 2005 Poul-Henning Kamp
 * Copyright (c) 1990, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Chris Torek.
 *
 * 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. 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.
 */

#include <namespace.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <stdint.h>
#include <assert.h>
#include <wchar.h>
#include "printf.h"

/*
 * Convert a wide character string argument for the %ls format to a multibyte
 * string representation. If not -1, prec specifies the maximum number of
 * bytes to output, and also means that we can't assume that the wide char.
 * string ends is null-terminated.
 */
static char *
__wcsconv(wchar_t *wcsarg, int prec)
{
        static const mbstate_t initial;
        mbstate_t mbs;
        char buf[MB_LEN_MAX];
        wchar_t *p;
        char *convbuf;
        size_t clen, nbytes;

        /* Allocate space for the maximum number of bytes we could output. */
        if (prec < 0) {
                p = wcsarg;
                mbs = initial;
                nbytes = wcsrtombs(NULL, (const wchar_t **)&p, 0, &mbs);
                if (nbytes == (size_t)-1)
                        return (NULL);
        } else {
                /*
                 * Optimisation: if the output precision is small enough,
                 * just allocate enough memory for the maximum instead of
                 * scanning the string.
                 */
                if (prec < 128)
                        nbytes = prec;
                else {
                        nbytes = 0;
                        p = wcsarg;
                        mbs = initial;
                        for (;;) {
                                clen = wcrtomb(buf, *p++, &mbs);
                                if (clen == 0 || clen == (size_t)-1 ||
                                    (int)(nbytes + clen) > prec)
                                        break;
                                nbytes += clen;
                        }
                }
        }
        if ((convbuf = malloc(nbytes + 1)) == NULL)
                return (NULL);

        /* Fill the output buffer. */
        p = wcsarg;
        mbs = initial;
        if ((nbytes = wcsrtombs(convbuf, (const wchar_t **)&p,
            nbytes, &mbs)) == (size_t)-1) {
                free(convbuf);
                return (NULL);
        }
        convbuf[nbytes] = '\0';
        return (convbuf);
}


/* 's' ---------------------------------------------------------------*/

int
__printf_arginfo_str(const struct printf_info *pi, size_t n, int *argt)
{

        assert (n > 0);
        if (pi->is_long || pi->spec == 'C')
                argt[0] = PA_WSTRING;
        else
                argt[0] = PA_STRING;
        return (1);
}

int
__printf_render_str(struct __printf_io *io, const struct printf_info *pi, const void *const *arg)
{
        const char *p;
        wchar_t *wcp;
        char *convbuf;
        int l;

        if (pi->is_long || pi->spec == 'S') {
                wcp = *((wint_t **)arg[0]);
                if (wcp == NULL)
                        return (__printf_out(io, pi, "(null)", 6));
                convbuf = __wcsconv(wcp, pi->prec);
                if (convbuf == NULL) 
                        return (-1);
                l = __printf_out(io, pi, convbuf, strlen(convbuf));
                free(convbuf);
                return (l);
        } 
        p = *((char **)arg[0]);
        if (p == NULL)
                return (__printf_out(io, pi, "(null)", 6));
        l = strlen(p);
        if (pi->prec >= 0 && pi->prec < l)
                l = pi->prec;
        return (__printf_out(io, pi, p, l));
}

/* 'c' ---------------------------------------------------------------*/

int
__printf_arginfo_chr(const struct printf_info *pi, size_t n, int *argt)
{

        assert (n > 0);
        if (pi->is_long || pi->spec == 'C')
                argt[0] = PA_WCHAR;
        else
                argt[0] = PA_INT;
        return (1);
}

int
__printf_render_chr(struct __printf_io *io, const struct printf_info *pi, const void *const *arg)
{
        int i;
        wint_t ii;
        unsigned char c;
        static const mbstate_t initial;         /* XXX: this is bogus! */
        mbstate_t mbs;
        size_t mbseqlen;
        char buf[MB_CUR_MAX];

        if (pi->is_long || pi->spec == 'C') {
                ii = *((wint_t *)arg[0]);

                mbs = initial;
                mbseqlen = wcrtomb(buf, (wchar_t)ii, &mbs);
                if (mbseqlen == (size_t) -1)
                        return (-1);
                return (__printf_out(io, pi, buf, mbseqlen));
        }
        i = *((int *)arg[0]);
        c = i;
        i = __printf_out(io, pi, &c, 1);
        __printf_flush(io);
        return (i);
}