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Annotation of qemu/roms/ipxe/src/hci/mucurses/widgets/editbox.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (C) 2006 Michael Brown <[email protected]>.
        !             3:  *
        !             4:  * This program is free software; you can redistribute it and/or
        !             5:  * modify it under the terms of the GNU General Public License as
        !             6:  * published by the Free Software Foundation; either version 2 of the
        !             7:  * License, or any later version.
        !             8:  *
        !             9:  * This program is distributed in the hope that it will be useful, but
        !            10:  * WITHOUT ANY WARRANTY; without even the implied warranty of
        !            11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
        !            12:  * General Public License for more details.
        !            13:  *
        !            14:  * You should have received a copy of the GNU General Public License
        !            15:  * along with this program; if not, write to the Free Software
        !            16:  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
        !            17:  */
        !            18: 
        !            19: FILE_LICENCE ( GPL2_OR_LATER );
        !            20: 
        !            21: #include <string.h>
        !            22: #include <assert.h>
        !            23: #include <ipxe/editbox.h>
        !            24: 
        !            25: /** @file
        !            26:  *
        !            27:  * Editable text box widget
        !            28:  *
        !            29:  */
        !            30: 
        !            31: #define EDITBOX_MIN_CHARS 3
        !            32: 
        !            33: /**
        !            34:  * Initialise text box widget
        !            35:  *
        !            36:  * @v box              Editable text box widget
        !            37:  * @v buf              Text buffer
        !            38:  * @v len              Size of text buffer
        !            39:  * @v win              Containing window
        !            40:  * @v row              Row
        !            41:  * @v col              Starting column
        !            42:  * @v width            Width
        !            43:  * @v flags            Flags
        !            44:  */
        !            45: void init_editbox ( struct edit_box *box, char *buf, size_t len,
        !            46:                    WINDOW *win, unsigned int row, unsigned int col,
        !            47:                    unsigned int width, unsigned int flags ) {
        !            48:        memset ( box, 0, sizeof ( *box ) );
        !            49:        init_editstring ( &box->string, buf, len );
        !            50:        box->string.cursor = strlen ( buf );
        !            51:        box->win = ( win ? win : stdscr );
        !            52:        box->row = row;
        !            53:        box->col = col;
        !            54:        box->width = width;
        !            55:        box->flags = flags;
        !            56: }
        !            57: 
        !            58: /**
        !            59:  * Draw text box widget
        !            60:  *
        !            61:  * @v box              Editable text box widget
        !            62:  *
        !            63:  */
        !            64: void draw_editbox ( struct edit_box *box ) {
        !            65:        size_t width = box->width;
        !            66:        char buf[ width + 1 ];
        !            67:        signed int cursor_offset, underflow, overflow, first;
        !            68:        size_t len;
        !            69: 
        !            70:        /* Adjust starting offset so that cursor remains within box */
        !            71:        cursor_offset = ( box->string.cursor - box->first );
        !            72:        underflow = ( EDITBOX_MIN_CHARS - cursor_offset );
        !            73:        overflow = ( cursor_offset - ( width - 1 ) );
        !            74:        first = box->first;
        !            75:        if ( underflow > 0 ) {
        !            76:                first -= underflow;
        !            77:                if ( first < 0 )
        !            78:                        first = 0;
        !            79:        } else if ( overflow > 0 ) {
        !            80:                first += overflow;
        !            81:        }
        !            82:        box->first = first;
        !            83:        cursor_offset = ( box->string.cursor - first );
        !            84: 
        !            85:        /* Construct underscore-padded string portion */
        !            86:        memset ( buf, '_', width );
        !            87:        buf[width] = '\0';
        !            88:        len = ( strlen ( box->string.buf ) - first );
        !            89:        if ( len > width )
        !            90:                len = width;
        !            91:        if ( box->flags & EDITBOX_STARS ) {
        !            92:                memset ( buf, '*', len );
        !            93:        } else {
        !            94:                memcpy ( buf, ( box->string.buf + first ), len );
        !            95:        }
        !            96: 
        !            97:        /* Print box content and move cursor */
        !            98:        if ( ! box->win )
        !            99:                box->win = stdscr;
        !           100:        mvwprintw ( box->win, box->row, box->col, "%s", buf );
        !           101:        wmove ( box->win, box->row, ( box->col + cursor_offset ) );
        !           102: }

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