ansi_screen.c

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#include <stdio.h>
#include <curses.h>
#include <console.h>

FILE_LICENCE ( GPL2_OR_LATER );

static void ansiscr_reset(struct _curses_screen *scr) __nonnull;
static void ansiscr_movetoyx(struct _curses_screen *scr,
                               unsigned int y, unsigned int x) __nonnull;
static void ansiscr_putc(struct _curses_screen *scr, chtype c) __nonnull;

unsigned short _COLS = 80;
unsigned short _LINES = 24;

static void ansiscr_reset ( struct _curses_screen *scr ) {
        /* Reset terminal attributes and clear screen */
        scr->attrs = 0;
        scr->curs_x = 0;
        scr->curs_y = 0;
        printf ( "\033[0m" );
}

static void ansiscr_movetoyx ( struct _curses_screen *scr,
                               unsigned int y, unsigned int x ) {
        if ( ( x != scr->curs_x ) || ( y != scr->curs_y ) ) {
                /* ANSI escape sequence to update cursor position */
                printf ( "\033[%d;%dH", ( y + 1 ), ( x + 1 ) );
                scr->curs_x = x;
                scr->curs_y = y;
        }
}

static void ansiscr_putc ( struct _curses_screen *scr, chtype c ) {
        unsigned int character = ( c & A_CHARTEXT );
        attr_t attrs = ( c & ( A_ATTRIBUTES | A_COLOR ) );
        int bold = ( attrs & A_BOLD );
        attr_t cpair = PAIR_NUMBER ( attrs );
        short fcol;
        short bcol;

        /* Update attributes if changed */
        if ( attrs != scr->attrs ) {
                scr->attrs = attrs;
                pair_content ( cpair, &fcol, &bcol );
                /* ANSI escape sequence to update character attributes */
                printf ( "\033[0;%d;3%d;4%dm", ( bold ? 1 : 22 ), fcol, bcol );
        }

        /* Print the actual character */
        putchar ( character );

        /* Update expected cursor position */
        if ( ++(scr->curs_x) == _COLS ) {
                scr->curs_x = 0;
                ++scr->curs_y;
        }
}

static int ansiscr_getc ( struct _curses_screen *scr __unused ) {
        return getchar();
}

static bool ansiscr_peek ( struct _curses_screen *scr __unused ) {
        return iskey();
}

SCREEN _ansi_screen = {
        .init           = ansiscr_reset,
        .exit           = ansiscr_reset,
        .movetoyx       = ansiscr_movetoyx,
        .putc           = ansiscr_putc,
        .getc           = ansiscr_getc,
        .peek           = ansiscr_peek,
};