/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 (c) 1995-1998 by Sun Microsystems, Inc.
 * All rights reserved.
 */

/* LINTLIBRARY */

/*
 * wgetn_ws.c
 *
 * XCurses Library
 *
 * Copyright 1990, 1995 by Mortice Kern Systems Inc.  All rights reserved.
 *
 */

#ifdef M_RCSID
#ifndef lint
static char rcsID[] =
"$Header: /team/ps/sun_xcurses/archive/local_changes/xcurses/src/lib/"
"libxcurses/src/libc/xcurses/rcs/wgetn_ws.c 1.7 1998/06/04 19:56:00 "
"cbates Exp $";
#endif
#endif

#include <private.h>
#include <limits.h>
#include <stdlib.h>
#include <m_wio.h>

static wint_t   fld_key;
static int      fld_echo;       /* Software echo flag. */
static int      fld_index;      /* Number of characters in fld_buffer. */
static int      fld_bytes;      /* fld_index expressed in bytes. */
static int      fld_mb;         /* Field is a multibyte character string. */
static wint_t   *fld_buffer;    /* Wide character buffer. */
static int      fld_maxlength;  /* Character length of buffer. */
static WINDOW   *fld_window;
static int      fld_row, fld_col;       /* Start of field in fld_window. */

static int      fld_done(void);
static int      fld_erase(void);
static int      fld_kill(void);
static int      fld_insert(void);

typedef struct t_key_entry {
        int     type;
        wint_t  code;
        int     (*func)(void);
} t_key_entry;

#define ERASE_KEY       0
#define KILL_KEY        1
#define EOF_KEY         2
#define EOL_KEY         3

static t_key_entry      key_table[] = {
        { OK, 0, fld_erase },
        { OK, 0, fld_kill },
#if VEOF == VMIN
        { OK, '\x04', fld_done },
        { OK, '\r', fld_done },
#else
        { OK, 0, fld_done },
        { OK, 0, fld_done },
#endif
        { OK, '\n', fld_done },
        { OK, WEOF, fld_done },
        { KEY_CODE_YES, KEY_LEFT, fld_erase },
        { KEY_CODE_YES, KEY_BACKSPACE, fld_erase },
        { KEY_CODE_YES, KEY_ENTER, fld_done },
        { ERR, 0, fld_insert }
};

/*
 * The effect of wgetnstr() is as though a series of calls to wgetch()
 * were made, until a <newline> or <return> are received.  The
 * resulting value is placed in the area pointed to by the character
 * pointer 's'.  wgetnstr() reads at most n characters, thus
 * preventing a possible overflow of the input buffer.  The user's
 * erase and kill characters are interpreted.
 *
 * If n < 0, wgetnstr() will read until a <newline> or <return> is
 * entered.  To accept functions keys, keypad() must be set for the
 * window.
 */
int
__m_wgetn_wstr(WINDOW *w, void *s, int n, int mb_flag)
{
        int     type;
        wchar_t wc;
        t_key_entry     *k;
        struct termios  saved;

        if (n == 0) {
            *(char *)s = '\0';
            return (OK);
        }
        fld_window = w;
        fld_index = 0;
        fld_bytes = 0;
        fld_mb = mb_flag;

        /* Read at most N bytes from the field. */
        fld_maxlength = n < 0 ? LINE_MAX : n;

        /* Make sure there is enough to hold the largest characater. */
        if (fld_mb && (fld_maxlength < (int)MB_CUR_MAX))
                return (ERR);

        if (mb_flag) {
                /*
                 * Create a wint_t buffer, which makes it easier to
                 * handle erasing characters from the line.
                 */
                fld_buffer = (wint_t *) calloc(fld_maxlength + 1,
                        sizeof (*fld_buffer));
                if (fld_buffer == NULL)
                        return (ERR);
        } else {
                fld_buffer = (wint_t *) s;
        }

#if VEOF != VMIN
        (void) __m_tty_wc(VEOL, &wc);
        key_table[EOL_KEY].code = (wint_t) wc;
        (void) __m_tty_wc(VEOF, &wc);
        key_table[EOF_KEY].code = (wint_t) wc;
#endif
        (void) __m_tty_wc(VKILL, &wc);
        key_table[KILL_KEY].code = (wint_t) wc;
        (void) __m_tty_wc(VERASE, &wc);
        key_table[ERASE_KEY].code = (wint_t) wc;

        getyx(fld_window, fld_row, fld_col);

        /*
         * We remember if the user specified echo on or off, then disable it
         * so that wgetch() doesn't perform any echoing before we've had a
         * chance to process the key.  fld_insert() will handle the necessary
         * echoing of characters.
         */
        fld_echo = __m_set_echo(0);
        saved = *PTERMIOS(_prog);

        if (!(cur_term->_flags & __TERM_HALF_DELAY))
                (void) cbreak();

        for (; ; ) {
                if ((type = wget_wch(fld_window, &fld_key)) == ERR)
                        break;

                for (k = key_table; k->type != ERR; ++k) {
                        if (k->type == type && k->code == fld_key) {
                                break;
                        }
                }

                if (k->func != (int (*)(void)) NULL && !(*k->func)()) {
                        /* If the edit function returned false then quit. */
                        fld_buffer[fld_index] = '\0';
                        break;
                }
        }

        /* Restore the I/O settings. */
        (void) __m_set_echo(fld_echo);
        (void) __m_tty_set(&saved);

        if (mb_flag) {
                (void) wistombs((char *) s, fld_buffer, fld_maxlength-1);
                free(fld_buffer);
        }

        return ((type == ERR) ? ERR : OK);
}

static int
wint_len(wint_t wc)
{
        int     len;
        char    mb[MB_LEN_MAX];

        if (wc == WEOF)
                return (0);

        len = wctomb(mb, (wchar_t) wc);

        return ((len < 0) ? 0 : len);
}

static int
fld_done(void)
{
        cchar_t cc;

        if (fld_echo) {
                (void) __m_wc_cc(fld_key, &cc);
                (void) wadd_wch(fld_window, &cc);
        }
        return (0);
}

static int
fld_erase(void)
{
        int     x, y, width;

        if (fld_index <= 0) {
                fld_buffer[fld_index-1] = 0;
                return (1);
        }

        width = wcwidth(fld_buffer[--fld_index]);
        fld_bytes -= wint_len(fld_buffer[fld_index]);
        fld_buffer[fld_index] = '\0';
        getyx(fld_window, y, x);

        if (0 < x) {
                /* Rubout previous character. */
                x -= width;
        } else if (0 < y) {
                /* Reverse line wrap. */
                --y;
                x = fld_window->_maxx - 1;

                /*
                 * Find end of previous character, skipping any background
                 * character that may have been written by auto-wrap.
                 */
                while (fld_buffer[fld_index] != fld_window->_line[y][x]._wc[0])
                        --x;

                /* Find first column of character. */
                x = __m_cc_first(fld_window, y, x);
        }

        (void) __m_cc_erase(fld_window, y, x, y, x);

        fld_window->_cury = (short) y;
        fld_window->_curx = (short) x;

        return (1);
}

static int
fld_kill(void)
{
        int     y, x;

        getyx(fld_window, y, x);
        (void) __m_cc_erase(fld_window, fld_row, fld_col, y, x);

        fld_window->_cury = (short) fld_row;
        fld_window->_curx = (short) fld_col;
        fld_index = fld_bytes = 0;
        fld_buffer[0] = '\0';

        return (1);
}

static int
fld_insert(void)
{
        cchar_t cc;
        t_wide_io       *wio;

        if (fld_maxlength <= (fld_index + 1))
                /* Completely full, terminate input. */
                return (0);

        wio = (t_wide_io *) __m_screen->_in;

        /*
         * Don't exceed the byte length for the field.
         *
         * m_wio_get() called by wget_wch(), records the
         * number of bytes converted, when _next == _size.
         *
         * wget_wch() makes sure that _next == _size by
         * pushing invalid multibyte characters on to an
         * input stack.
         */
        if (fld_mb && fld_maxlength < fld_bytes + wio->_size) {
                /* Is there still room for single-byte characters? */
                if (fld_bytes < fld_maxlength) {
                        (void) beep();
                        return (1);
                }

                /* Completely full, terminate input. */
                return (0);
        }

        if (0 <= fld_key) {
                fld_buffer[fld_index++] = fld_key;
                fld_bytes += wio->_size;

                if (fld_echo) {
                        (void) __m_wc_cc(fld_key, &cc);
                        (void) wadd_wch(fld_window, &cc);
                }
        } else {
                (void) beep();
        }

        return (1);
}

int
wgetnstr(WINDOW *w, char *s, int n)
{
        int     code;

        code = __m_wgetn_wstr(w, (void *) s, n, 1);

        return (code);
}

int
wgetn_wstr(WINDOW *w, wint_t *s, int n)
{
        int     code;

        code = __m_wgetn_wstr(w, (void *) s, n, 0);

        return (code);
}