/* screen_buffer.c - MemTest-86  Version 3.2 * * Released under version 2 of the Gnu Public License. * By Jani Averbach, Jaa@iki.fi, 2001 */#include "test.h"#include "screen_buffer.h"#define SCREEN_X 80#define SCREEN_Y 25#define Y_SIZE SCREEN_Y/* * X-size should by one of by screen size,  * so that there is room for ending '\0' */#define X_SIZE SCREEN_X+1static char screen_buf[Y_SIZE][X_SIZE];#ifdef SCRN_DEBUGchar *padding = "12345678901234567890123456789012345678901234567890123456789012345678901234567890";#define CHECK_BOUNDS(y,x) do {if (y < 0 || Y_SIZE <= y || x < 0 || X_SIZE <= x) print_error("out of index");}while(0)#else /* ! SCRN_DEBUG */#define CHECK_BOUNDS(y,x)#endif /* SCRN_DEBUG */charget_scrn_buf(const int y,             const int x){    CHECK_BOUNDS(y,x);    return screen_buf[y][x];}voidset_scrn_buf(const int y,             const int x,             const char val){    CHECK_BOUNDS(y,x);    screen_buf[y][x] = val;}void clear_screen_buf(){    int y, x;    for (y=0; y < SCREEN_Y; ++y){        for (x=0; x < SCREEN_X; ++x){            CHECK_BOUNDS(y,x);            screen_buf[y][x] = ' ';        }        CHECK_BOUNDS(y,SCREEN_X);        screen_buf[y][SCREEN_X] = '\0';    }}void tty_print_region(const int pi_top,                       const int pi_left,                      const int pi_bottom,                      const int pi_right){    int y;    char tmp;    for (y=pi_top; y < pi_bottom; ++y){        CHECK_BOUNDS(y, pi_right);                tmp = screen_buf[y][pi_right];        screen_buf[y][pi_right] = '\0';        CHECK_BOUNDS(y, pi_left);        ttyprint(y, pi_left, &(screen_buf[y][pi_left]));                        screen_buf[y][pi_right] = tmp;    }}void tty_print_line(	int y, int x, const char *text){	for(; *text && (x < SCREEN_X); x++, text++) {		if (*text != screen_buf[y][x]) {			break;		}	}	/* If there is nothing to do return */	if (*text == '\0') {		return;	}	ttyprint(y, x, text);	for(; *text && (x < SCREEN_X); x++, text++) {		screen_buf[y][x] = *text;	}}void tty_print_screen(void){#ifdef SCRN_DEBUG    int i;     for (i=0; i < SCREEN_Y; ++i)        ttyprint(i,0, padding);#endif /* SCRN_DEBUG */    tty_print_region(0, 0, SCREEN_Y, SCREEN_X);}void print_error(char *pstr){#ifdef SCRN_DEBUG    ttyprint(0,0, padding);#endif /* SCRN_DEBUG */    ttyprint(0,35, pstr);                while(1);}