form/common/chg_data.c

/*
 * 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) 1988 AT&T */
/*    All Rights Reserved   */


/*
 *      Copyright (c) 1997, by Sun Microsystems, Inc.
 *      All rights reserved.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*LINTLIBRARY*/

#include <sys/types.h>
#include <stdlib.h>
#include "utility.h"

#define AT_BOTTOM(f)    (Y(f) == Ymax(f) - 1)       /* last line    */
#define AT_END(f)   (Y(f) == Ymax(f) - 1 && X(f) == Xmax(f) - 1)
                            /* last char */
#define AT_BEGINNING(f) (Y(f) == 0 && X(f) == 0)    /* first char   */

static int
room_for_line(FORM *f)
{
    char *v;

    _sync_buffer(f);
    v = LineBuf(C(f), Ymax(f) - 1);
    return (v == _data_end(v, Xmax(f)));    /* check for empty line */
}

static int
room_for_char(FORM *f)
{
    WINDOW * w = W(f);
    int c;

    (void) wmove(w, Y(f), Xmax(f) - 1);
    c = (int)(winch(w) & A_CHARTEXT);
    (void) wmove(w, Y(f), X(f));
    return (c == Pad(C(f)));    /* check for empty char */
}

static int
extra_padding(char *str, int nstr)      /* used for word wrapping */
{
    int c = *(str + nstr - 1);

    if (c == '"' || c == '\'')
        c = *(str + nstr - 2);

    return ((c == '.' || c == '?' || c == '!' || c == ':') ? 2 : 1);

}

BOOLEAN
_grow_field(FIELD *c, int chunks)
{
    /* This function handles the growth of dymanically growable fields */
    /* Returns TRUE if successful, FALSE otherwise  */

    FORM        *f = c->form;
    WINDOW      *w = W(f);
    BOOLEAN     current = Status(f, POSTED) && c == C(f);
    char        *old_buf;
    char        *new_buf;
    char        *save;
    int     old_len = BufSize(c);
    int     grow;
    int     lcv;
    int     max = c->maxgrow;
    int     i;

    if (current && Status(f, WIN_CHG)) {
        _win_to_buf(w, c);
        Clr(f, WIN_CHG);
        Set(f, BUF_CHG);
    }

    if (OneRow(c)) {
        grow = chunks * c->cols;

        if (max)
            grow = MIN(max - c->dcols, grow);

        c->dcols += grow;

        if (c->dcols == max)
            Clr(c, GROWABLE);
    } else {
        grow = chunks * (c->rows + c->nrow);

        if (max)
            grow = MIN(max - c->drows, grow);

        c->drows += grow;
        grow *= c->cols;

        if (c->drows == max)
            Clr(c, GROWABLE);
    }

    save = old_buf = Buf(c);
    new_buf = Buf(c) = malloc(TotalBuf(c));

    if (!new_buf)
        return (FALSE);

    lcv = c->nbuf + 1;

    for (i = 0; i < lcv; i++) {
        (void) memcpy(new_buf, old_buf, old_len);
        (void) memset(new_buf + old_len, ' ', grow);
        old_buf += old_len + 1;
        new_buf += old_len + grow;
        *new_buf++ = '\0';
    }

    free(save); /* delete old buffer */

    if (current) {
        (void) delwin(w);
        W(f) = w = newwin(c->drows, c->dcols, 0, 0);

        if (!w)
            return (FALSE);

        wbkgdset(w, Pad(c) | Back(c));
        (void) wattrset(w, Fore(c));
        (void) werase(w);
        _buf_to_win(c, w);
        (void) untouchwin(w);
        (void) wmove(w, Y(f), X(f));
    }

    if (c->link != c) {
        FIELD   *p = c->link;

        while (p != c) {
            Buf(p) = Buf(c);
            p->drows = c->drows;
            p->dcols = c->dcols;
            /* _sync_field(p) */
            p = p->link;
        }
    }

    return (TRUE);
}

static int
insert_str(FORM *f, int y, int off, int nstr)   /* used for word wrapping */
{
    WINDOW      *w  = W(f);
    FIELD       *c  = C(f);
    char        *vbeg   = LineBuf(c, y);
    char        *v  = _data_end(vbeg, Xmax(f));
    int     x   = (int)(v - vbeg);
    int     n   = Xmax(f) - x;
    int     pad = extra_padding(Buf(c) + off, nstr);
    int     siz = nstr + 1 + pad;
    int     ret     = E_REQUEST_DENIED;

    if (n >= siz) { /* check for fit on this line */
        (void) wmove(w, y, 0);
        (void) winsnstr(w, Buf(c) + off, nstr);
        (void) wmove(w, y, nstr);
        (void) winsnstr(w, "  ", pad);
    } else {        /* wrap */
        if (y == Ymax(f) - 1 && Status(c, GROWABLE)) {
            if (!_grow_field(c, 1))
                return (E_SYSTEM_ERROR);

            vbeg = LineBuf(c, y);   /* grow changes buffer */
            w = W(f);       /* grow changes window */
        }

        v = _data_beg(vbeg + Xmax(f) - siz, siz);
        v = _whsp_end(vbeg, (int)(v - vbeg));
        x = (int)(v - vbeg);
        n = Xmax(f) - x - n;

        if (y < Ymax(f) - 1 && (ret =
            insert_str(f, y+1, (int)(v - Buf(c)), n)) == E_OK) {
            (void) wmove(w, y, x);
            (void) wclrtoeol(w);
            (void) wmove(w, y, 0);
            (void) winsnstr(w, Buf(c) + off, nstr);
            (void) wmove(w, y, nstr);
            (void) winsnstr(w, "  ", pad);
        } else
            return (ret);   /* no room for wrap */
    }
    return (E_OK);
}

static int
wrap_ok(FORM *f)        /* used for word wrapping */
{
/*
 * when this routine is called a char has already been added/inserted
 * on the screen at Y(f), X(f).  this routine checks to see if the current
 * line needs wrapping and if so attempts the wrap.  if unsuccessful
 * it deletes the char at Y(f), X(f) and returns FALSE.
 */
    FIELD       *c = C(f);
    BOOLEAN     at_bottom = AT_BOTTOM(f);
    int     ret = E_REQUEST_DENIED;

    if (Opt(c, O_WRAP) && !OneRow(c) && !room_for_char(f) &&
        (!at_bottom || Status(c, GROWABLE))) {
        WINDOW *w;
        char *vbeg;
        char *v;
        int x, n;

        if (at_bottom && !_grow_field(c, 1))
            return (E_SYSTEM_ERROR);

        vbeg = LineBuf(c, Y(f));
        w = W(f);

        _win_to_buf(w, c);  /* sync buffer without changing flags */

        v = _whsp_end(vbeg, Xmax(f));
        x = (int)(v - vbeg);
        n = Xmax(f) - x;

        if (x && (ret = insert_str(f, Y(f)+1, (int)(v - Buf(c)), n)) ==
            E_OK) {
            w = W(f);   /* window may change in insert_str */
            (void) wmove(w, Y(f), x);
            (void) wclrtoeol(w);

            if (X(f) >= x) {
                ++Y(f);
                X(f) = X(f) - x;
            }
        } else {    /* error condition */
            if (ret == E_SYSTEM_ERROR)
                return (E_SYSTEM_ERROR);

            (void) wmove(w, Y(f), X(f));
            (void) wdelch(w);   /* delete the char */
            _win_to_buf(w, c);  /* restore buffer  */
            return (E_REQUEST_DENIED);
        }
    }
    return (E_OK);
}

int
_new_line(FORM *f)
{
/*
 *      overloaded operation
 *
 *  if at beginning of field
 *      move to next field
 *
 *  else if in OVERLAY mode
 *      if on last line of field
 *          clear to eol and move to next field
 *      else
 *          clear to eol and move to beginning of next line
 *
 *  else if in INSERT mode
 *      if on last line of field
 *          move to next field
 *      else
 *          move text from cursor to eol to new line
 */
    BOOLEAN     at_bottom = AT_BOTTOM(f);
    FIELD *     c = C(f);

    if (Opt(f, O_NL_OVERLOAD) && AT_BEGINNING(f))
        return (_field_navigation(_next_field, f));

    if (!Opt(c, O_EDIT))
        return (E_REQUEST_DENIED);

    if (Status(f, OVERLAY)) {       /* OVERLAY mode */
        if (at_bottom && (!Status(c, GROWABLE) || OneRow(c))) {
            if (Opt(f, O_NL_OVERLOAD)) {
                (void) wclrtoeol(W(f));
                Set(f, WIN_CHG);
                return (_field_navigation(_next_field, f));
            } else
                return (E_REQUEST_DENIED);
        }

        if (at_bottom && !_grow_field(c, 1))
            return (E_SYSTEM_ERROR);

        (void) wclrtoeol(W(f));
        ++Y(f); X(f) = 0;
    } else {        /* INSERT mode  */
        BOOLEAN     room;

        if (at_bottom && (!Status(c, GROWABLE) || OneRow(c))) {
            if (Opt(f, O_NL_OVERLOAD))
                return (_field_navigation(_next_field, f));
            else
                return (E_REQUEST_DENIED);
        }

        room = !at_bottom && room_for_line(f);

        if (room || Status(c, GROWABLE)) {
            WINDOW  *w;
            char *v;
            char *vend;

            if (!room && !_grow_field(c, 1))
                return (E_SYSTEM_ERROR);

            w = W(f);
            v = LineBuf(c, Y(f)) + X(f);
            vend = _data_end(v, Xmax(f) - X(f));

            (void) wclrtoeol(w);
            ++Y(f); X(f) = 0;
            (void) wmove(w, Y(f), X(f));
            (void) winsertln(w);
            (void) waddnstr(w, v, (int)(vend - v));
        } else
            return (E_REQUEST_DENIED);
    }
    Set(f, WIN_CHG);
    return (E_OK);
}

/* _ins_char - insert blank char with error on overflow */
int
_ins_char(FORM *f)
{
    FIELD   *c = C(f);
    BOOLEAN room = room_for_char(f);

    if (CheckChar(c, ' ') && (room || (OneRow(c) &&
        Status(c, GROWABLE)))) {
        if (!room && !_grow_field(c, 1))
            return (E_SYSTEM_ERROR);

        (void) winsch(W(f), ' ');

        return (wrap_ok(f));
    }
    return (E_REQUEST_DENIED);
}

/* _ins_line -  insert blank line with error on overflow */
int
_ins_line(FORM *f)
{
    BOOLEAN     room = !AT_BOTTOM(f) && room_for_line(f);
    FIELD       *c = C(f);

    if (CheckChar(c, ' ') && !OneRow(c) && (room || Status(c, GROWABLE))) {
        if (!room && !_grow_field(c, 1))
            return (E_SYSTEM_ERROR);

        X(f) = 0;
        (void) winsertln(W(f));
        return (E_OK);
    }
    return (E_REQUEST_DENIED);
}

/* _del_char - delete char at cursor */
int
_del_char(FORM *f)
{
    (void) wdelch(W(f));
    return (E_OK);
}

int
_del_prev(FORM *f)
{
/*
 *      overloaded operation
 *
 *  if at beginning of field
 *      move to previous field
 *
 *  else if in OVERLAY mode
 *      if at beginning of line
 *          error
 *      else
 *          delete previous char
 *
 *  else if in INSERT mode
 *      if at beginning of line
 *          if current line can fit on preceding
 *              join current line with preceding line
 *          else
 *              error
 *      else
 *          delete previous char
 */
    WINDOW *    w = W(f);
    FIELD *     c = C(f);

    if (AT_BEGINNING(f)) {
        if (Opt(f, O_BS_OVERLOAD))
            return (_field_navigation(_prev_field, f));
        else
            return (E_REQUEST_DENIED);
    }
    if (!Opt(c, O_EDIT))
        return (E_REQUEST_DENIED);

    if (--X(f) < 0) {
        ++X(f);

        if (Status(f, OVERLAY)) /* OVERLAY mode */
            return (E_REQUEST_DENIED);
        else {          /* INSERT mode  */
            char *p = LineBuf(c, Y(f) - 1);
            char *v = LineBuf(c, Y(f));
            char *pend;
            char *vend;

            _sync_buffer(f);
            pend = _data_end(p, Xmax(f));
            vend = _data_end(v, Xmax(f));

            if ((vend - v) > (Xmax(f) - (pend - p)))
                return (E_REQUEST_DENIED);
            else {
                (void) wdeleteln(w);
                _adjust_cursor(f, pend);
                (void) wmove(w, Y(f), X(f));
                (void) waddnstr(w, v, (int)(vend - v));
            }
        }
    } else {
        (void) wmove(w, Y(f), X(f));
        (void) wdelch(w);
    }
    Set(f, WIN_CHG);
    return (E_OK);
}

/* _del_line - delete current line */
int
_del_line(FORM *f)
{
    X(f) = 0;
    (void) wdeleteln(W(f));
    return (E_OK);
}

/* _del_word - delete word under cursor plus trailing blanks */
int
_del_word(FORM *f)
{
    FIELD *c = C(f);
    WINDOW *w = W(f);
    char *y = LineBuf(c, Y(f));
    char *t = y + Xmax(f);
    char *v = y + X(f);
    char *x = v;

    _sync_buffer(f);

    if (*v == ' ')
        return (E_REQUEST_DENIED);

    _adjust_cursor(f, _whsp_end(y, X(f)));
    (void) wmove(w, Y(f), X(f));
    (void) wclrtoeol(w);

    v = _whsp_beg(v, (int)(t - v));
    v = _data_beg(v, (int)(t - v));

    if (v != x && *v != ' ')
        (void) waddnstr(w, v, (int)(_data_end(v, (int)(t - v)) - v));

    return (E_OK);
}

/* _clr_eol - clear to end of line */
int
_clr_eol(FORM *f)
{
    (void) wclrtoeol(W(f));
    return (E_OK);
}

/* _clr_eof - clear to end of field */
int
_clr_eof(FORM *f)
{
    (void) wclrtobot(W(f));
    return (E_OK);
}

/* _clr_field - clear entire field */
int
_clr_field(FORM *f)
{
    X(f) = 0; Y(f) = 0;
    (void) werase(W(f));
    return (E_OK);
}

/* _ovl_mode - go into overlay mode */
int
_ovl_mode(FORM *f)
{
    Set(f, OVERLAY);
    return (E_OK);
}

/* _ins_mode - go into insert mode */
int
_ins_mode(FORM *f)
{
    Clr(f, OVERLAY);
    return (E_OK);
}

/* _validation - apply validation function associated with field type */
int
_validation(FORM *f)
{
    return (_validate(f) ? E_OK : E_INVALID_FIELD);
}

/* _next_choice - apply next choice function associated with field type */
int
_next_choice(FORM *f)
{
    _sync_buffer(f);
    return (NextChoice(C(f)) ? E_OK : E_REQUEST_DENIED);
}

/* _prev_choice - apply previous choice function associated with field type */
int
_prev_choice(FORM *f)
{
    _sync_buffer(f);
    return (PrevChoice(C(f)) ? E_OK : E_REQUEST_DENIED);
}

/*
 * _data_entry - enter printable ascii char ch
 * in current field at cursor position
 */
int
_data_entry(FORM *f, int ch)
{
    FIELD *     c = C(f);   /* current field    */
    WINDOW *    w = W(f);   /* field window     */
    BOOLEAN     at_end;
    int     ret;

    if (!Opt(c, O_EDIT))
        return (E_REQUEST_DENIED);

    if (AT_BEGINNING(f) && Opt(c, O_BLANK) && ! Status(f, BUF_CHG) &&
        !Status(f, WIN_CHG))
        (void) werase(w);

    if (Status(f, OVERLAY)) /* OVERLAY mode */
        (void) waddch(w, (chtype) ch);
    else {              /* INSERT mode  */
        BOOLEAN room = room_for_char(f);

        if (room || (OneRow(c) && Status(c, GROWABLE))) {
            if (!room && !_grow_field(c, 1))
                return (E_SYSTEM_ERROR);

            (void) winsch(w, (chtype) ch);
        } else
            return (E_REQUEST_DENIED);
    }

    if ((ret = wrap_ok(f)) != E_OK)
        return (ret);

    Set(f, WIN_CHG);

    at_end = AT_END(f);

    if (at_end && !Status(c, GROWABLE) && Opt(c, O_AUTOSKIP))
        return (_field_navigation(_next_field, f));

    if (at_end && Status(c, GROWABLE) && !_grow_field(c, 1))
        return (E_SYSTEM_ERROR);

    (void) _next_char(f);
    return (E_OK);
}