/*
 * 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, by Sun Microsystems, Inc.
 * All rights reserved.
 */

/*
 * 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: /rd/src/libc/xcurses/rcs/wgetn_ws.c 1.3 1995/10/02 15:07:23 ant 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 },
        { OK, 0, fld_done },
        { OK, 0, fld_done },
        { OK, '\n', fld_done },
        { OK, WEOF, fld_done },
        { KEY_CODE_YES, KEY_LEFT, fld_erase },
        { KEY_CODE_YES, KEY_BACKSPACE, fld_erase },
        { ERR, 0, fld_insert }
};

/*f
 * 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(w, s, n, mb_flag)
WINDOW *w;
void *s;
int n, mb_flag;
{
        int type;
        wchar_t wc;
        t_key_entry *k;
        struct termios saved;

#ifdef M_CURSES_TRACE
        __m_trace("__m_wgetn_wstr(%p, %p, %d, %d)", w, s, n, mb_flag);
#endif

        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 < MB_CUR_MAX)
                return __m_return_code("wgetn_wstr", 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 == (wint_t *) 0)
                        return __m_return_code("wgetn_wstr", ERR);
        } else {
                fld_buffer = (wint_t *) s;
        }

        (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;
        (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 = cur_term->_prog;
        (void) cbreak();

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

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

                if (k->func != (int (*)(void)) 0 && !(*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 __m_return_code("__m_wgetn_wstr", OK);
}

STATIC int
wint_len(wc)
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()
{
        return 0;
}

STATIC int
fld_erase()
{
        int x, y, width;

        if (fld_index <= 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 = y;
        fld_window->_curx = x;

        return 1;
}

STATIC int
fld_kill()
{
        int y, x;

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

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

        return 1;
}

STATIC int
fld_insert()
{
        cchar_t cc;
        t_wide_io *wio;

        if (fld_maxlength < fld_index)
                /* 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(w, s, n)
WINDOW *w;
char *s;
int n;
{
        int code;

#ifdef M_CURSES_TRACE
        __m_trace("wgetnstr(%p, %p, %d)", w, s, n);
#endif

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

        return __m_return_code("wgetnstr", code);
}

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

#ifdef M_CURSES_TRACE
        __m_trace("wgetn_wstr(%p, %p, %d)", w, s, n);
#endif

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

        return __m_return_code("wgetn_wstr", code);
}