mucurses.c

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#include <curses.h>
#include "mucurses.h"
 
/** @file
 *
 * MuCurses core functions
 *
 */
 
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
FILE_SECBOOT ( PERMITTED );
 
static void _wupdcurs ( WINDOW *win ) __nonnull;
void _wputch ( WINDOW *win, chtype ch, int wrap ) __nonnull;
void _wputc ( WINDOW *win, char c, int wrap ) __nonnull;
void _wcursback ( WINDOW *win ) __nonnull;
void _wputchstr ( WINDOW *win, const chtype *chstr, int wrap, int n ) __nonnull;
void _wputstr ( WINDOW *win, const char *str, int wrap, int n ) __nonnull;
int wmove ( WINDOW *win, int y, int x ) __nonnull;
 
WINDOW _stdscr = {
        .attrs = A_DEFAULT,
        .ori_y = 0,
        .ori_x = 0,
        .curs_y = 0,
        .curs_x = 0,
        .scr = &_ansi_screen,
};
 
/*
 *  Primitives
 */
 
/**
 * Update cursor position
 *
 * @v *win      window in which to update position
 */
static void _wupdcurs ( WINDOW *win ) {
        win->scr->movetoyx ( win->scr, win->ori_y + win->curs_y,
                             win->ori_x + win->curs_x );
}
 
/**
 * Write a single character rendition to a window
 *
 * @v *win      window in which to write
 * @v ch        character rendition to write
 * @v wrap      wrap "switch"
 */
void _wputch ( WINDOW *win, chtype ch, int wrap ) {
        /* make sure we set the screen cursor to the right position
           first! */
        _wupdcurs(win);
        win->scr->putc(win->scr, ch);
        if ( ++(win->curs_x) - win->width == 0 ) {
                if ( wrap == WRAP ) {
                        win->curs_x = 0;
                        /* specification says we should really scroll,
                           but we have no buffer to scroll with, so we
                           can only overwrite back at the beginning of
                           the window */
                        if ( ++(win->curs_y) - win->height == 0 )
                                win->curs_y = 0;
                } else {
                        (win->curs_x)--;
                }
        }
}
 
/**
 * Write a single character to a window
 *
 * @v *win      window in which to write
 * @v c         character rendition to write
 * @v wrap      wrap "switch"
 */
void _wputc ( WINDOW *win, char c, int wrap ) {
        _wputch ( win, ( ( ( unsigned char ) c ) | win->attrs ), wrap );
}
 
/**
 * Retreat the cursor back one position (useful for a whole host of
 * ops)
 *
 * @v *win      window in which to retreat
 */
void _wcursback ( WINDOW *win ) {
        if ( win->curs_x == 0 ) {
                if ( win->curs_y == 0 )
                        win->curs_y = win->height - 1;
                win->curs_x = win->width = 1;
        } else {
                win->curs_x--;
        }
 
        _wupdcurs(win);
}
 
/**
 * Write a chtype string to a window
 *
 * @v *win      window in which to write
 * @v *chstr    chtype string
 * @v wrap      wrap "switch"
 * @v n         write at most n chtypes
 */
void _wputchstr ( WINDOW *win, const chtype *chstr, int wrap, int n ) {
        for ( ; *chstr && n-- ; chstr++ ) {
                _wputch(win,*chstr,wrap);
        }
}
 
/**
 * Write a standard c-style string to a window
 *
 * @v *win      window in which to write
 * @v *str      string
 * @v wrap      wrap "switch"
 * @v n         write at most n chars from *str
 */
void _wputstr ( WINDOW *win, const char *str, int wrap, int n ) {
        for ( ; *str && n-- ; str++ ) {
                _wputc ( win, *str, wrap );
        }
}
 
/**
 * Move a window's cursor to the specified position
 *
 * @v *win      window to be operated on
 * @v y         Y position
 * @v x         X position
 * @ret rc      return status code
 */
int wmove ( WINDOW *win, int y, int x ) {
        /* chech for out-of-bounds errors */
        if ( ( (unsigned)y >= win->height ) ||
             ( (unsigned)x >= win->width ) ) {
                return ERR;
        }
 
        win->curs_y = y;
        win->curs_x = x;
        _wupdcurs(win);
        return OK;
}
 
/**
 * Set cursor visibility
 *
 * @v visibility cursor visibility
 */
int curs_set ( int visibility ) {
        stdscr->scr->cursor ( stdscr->scr, visibility );
        return OK;
}