netware-screensaver.h

/***************************************************************************
*
*   Copyright(c) Jeff V. Merkey 1997-2019.  All rights reserved.
*
*   Licensed under the Lesser GNU Public License (LGPL) v2.1.
*
*   NetWare SMP style worm screesnsaver for Linux using ncurses
*
*   USAGE:  netware-worms [cpus|speedup]
*       i.e. worm cpus=<num=8 to 256> speedup=<divisor=1|2|3|4>
*   examples:
*       netware-worms cpus=8\n");
*          start worm screensaver with 8 worm threads
*       netware-worms speedup=4\n");
*          run worm screensaver at 4X speed
*
**************************************************************************/

#define WORM_MIN_LEN     4
#define WORM_MAX_LEN    36
#define WORM_TAIL_LEN    3
#define MAX_WORMS       64

// adjust worm total length based on screen area size.  smaller
// displays have shorter worms.  the current logic adjusts for
// worm speedup based on the current max worm length.  Here we
// check a min and max screen area for worm length expansion.

#define AREA_BASE_LEN   (WORM_MAX_LEN / 2)
#define AREA_MINLINES   19
#define AREA_MINCOLS    80
#define AREA_MIN        (AREA_MINLINES * AREA_MINCOLS)
#define AREA_MAXLINES   64
#define AREA_MAXCOLS    160
#define AREA_MAX        (AREA_MAXLINES * AREA_MAXCOLS)
#define AREA            ((COLS * LINES) < (AREA_MINLINES * AREA_MINCOLS) \
			 ? (AREA_MINLINES * AREA_MINCOLS) : (COLS * LINES))
#define AREA_DIVISOR    ((AREA_MAX - AREA_MIN) / AREA_BASE_LEN)
#define AREA_EXT_LEN    (((AREA - (AREA_MIN)) / (AREA_DIVISOR)) > \
			AREA_BASE_LEN ? AREA_BASE_LEN : \
			((AREA - (AREA_MIN)) / (AREA_DIVISOR)))

#define MAX_LOADAVG   100
#define MAX_NANOSEC   100000000
#define MIN_NANOSEC   10000000
#define MAX_MICROSEC  100000
#define MIN_MICROSEC  10000

typedef struct _WORM
{
    int cpu;
    int count;
    int limit;
    int x[WORM_MAX_LEN];
    int y[WORM_MAX_LEN];
    int x_prev[WORM_MAX_LEN];
    int y_prev[WORM_MAX_LEN];
    int length;
    int length_prev;
    int direction;
    int runlength;
    int windowlength;
} WORM;

typedef struct _STATE
{
    int cpus;
    int delay;
    int divisor;
    int rows;
    int cols;
    unsigned long long usr[MAX_WORMS];
    unsigned long long sys[MAX_WORMS];
    unsigned long long nice[MAX_WORMS];
    unsigned long long idle[MAX_WORMS];
    unsigned long long io[MAX_WORMS];
    unsigned long long irq[MAX_WORMS];
    unsigned long long sirq[MAX_WORMS];
    unsigned long long steal[MAX_WORMS];
    unsigned long long guest[MAX_WORMS];
    unsigned long long guest_nice[MAX_WORMS];
    WORM *worms;
} STATE;

int cworthy_netware_screensaver(void);