looking for rot
Peter da Silva
peter at ficc.ferranti.com
Thu May 2 02:38:35 AEST 1991
As the author of "rot":
#! /bin/sh
# This is a shell archive. Remove anything before this line, then feed it
# into a shell via "sh file" or similar. To overwrite existing files,
# type "sh file -c".
# The tool that generated this appeared in the comp.sources.unix newsgroup;
# send mail to comp-sources-unix at uunet.uu.net if you want that tool.
# If this archive is complete, you will see the following message at the end:
# "End of shell archive."
# Contents: Makefile rot.c
# Wrapped by peter at ficc.ferranti.com on Thu Dec 27 11:45:43 1990
PATH=/bin:/usr/bin:/usr/ucb ; export PATH
if test -f 'Makefile' -a "${1}" != "-c" ; then
echo shar: Will not clobber existing file \"'Makefile'\"
else
echo shar: Extracting \"'Makefile'\" \(214 characters\)
sed "s/^X//" >'Makefile' <<'END_OF_FILE'
X# Simple makefile for rot program
X# for that bloody stupid System V Make
XSHELL=/bin/sh
X
XCFLAGS = -O #-DSYSV
X
Xrot: rot.c
X cc $(CFLAGS) -o rot rot.c -ltermlib
X
Xrot.shar: Makefile rot.c
X shar >rot.shar Makefile rot.c
END_OF_FILE
if test 214 -ne `wc -c <'Makefile'`; then
echo shar: \"'Makefile'\" unpacked with wrong size!
fi
# end of 'Makefile'
fi
if test -f 'rot.c' -a "${1}" != "-c" ; then
echo shar: Will not clobber existing file \"'rot.c'\"
else
echo shar: Extracting \"'rot.c'\" \(10602 characters\)
sed "s/^X//" >'rot.c' <<'END_OF_FILE'
X/*
X * Revision History:
X *
X * Original source from:
X * Peter da Silva (ihnp4!shell!neuro1!{hyd-ptd,datafact,baylor}!peter)
X *
X * Changes for padding added by:
X * Andrew Scott Beals ({ucbvax,decwrl}!amdcad!bandy or bandy at amdcad.amd.com)
X * 20 April 1987
X *
X * Additional changes for padding, fix for computation of tglen,
X * increase max lines, improve termlib handling, add System V #ifdefs.
X * Bill Randle (billr at tekred.TEK.COM)
X * 21 April 1987
X *
X * Some long-standing 8-bit bugs fixed, and more randomness added.
X * Peter da Silva <peter at sugar.hackercorp.com> Dec 1 1989.
X *
X * ((char *)0) de-referencing removed. [Caused SEGV core dumps on Sun-3's]
X * Andrew Scott Beals <bandy at toad.com> 7 May 1990
X *
X * "PG" emulation added Dec '90 by Peter da Silva, in a fit of boredom.
X * Now "rot" acts like a pager, only dumping the screen if you wait too long.
X */
X
X#include <stdio.h>
X
X#ifdef SYSV
X# include <termio.h>
X#else
X# include <sgtty.h>
X#endif
X
X#include <signal.h>
X
X/* -- Miscellaneous defines -- */
X#define FALSE 0
X#define TRUE 1
X#define MAXCOL 80
X#define MAXLI 34
X#define SLEEPFACTOR 2 /* Assumed reading speed, lines per second */
X#define COLRATIO 8 /* For delays, amount to discount columns by */
X
Xextern char *tgetstr();
X
Xint lastx, lasty;
Xstruct _c {
X struct _c *c_next;
X int c_line, c_column;
X char c_mark;
X} *clist;
X
X/* -- Global variables -- */
Xchar *tent; /* Pointer to tbuf */
Xextern char PC; /* Pad character */
Xextern char *UP, *BC; /* Upline, backsapce character */
Xextern short ospeed; /* Terminal output speed */
Xint tglen;
X
Xchar *cm, /* Cursor motion */
X *cl, /* Clear screen */
X *ti, /* Init terminal */
X *te; /* Reset terminal */
Xint li, /* lines on screen */
X co; /* columns ditto */
Xchar screen[MAXLI+1][MAXCOL];
Xchar newscreen[MAXLI+1][MAXCOL];
Xchar *me; /* program name */
X
X/* Options */
Xint packflag = 0;
X
Xmain(ac, av)
Xint ac;
Xchar **av;
X{
X /* set ospeed so padding works correctly */
X#ifdef SYSV
X struct termio p;
X
X if(ioctl(1, TCGETA, &p) != -1)
X ospeed=p.c_cflag & CBAUD;
X#else
X struct sgttyb p;
X
X if(ioctl(1, TIOCGETP, &p) != -1)
X ospeed=p.sg_ospeed;
X#endif
X
X me = *av;
X
X srand(getpid());
X tinit(getenv("TERM"));
X while(ac > 1 && av[1][0]=='-') {
X while(av[1][1]) {
X switch(av[1][1]) {
X case 'p': packflag=1; break;
X default: fprintf(stderr, "%s [-p] [file]...\n", me);
X }
X av[1]++;
X }
X av++;
X ac--;
X }
X if(ac > 1)
X while(*++av)
X dropf(*av);
X else
X fdropf(stdin);
X tend();
X}
X
Xat(x, y, c)
Xint x, y;
Xchar c;
X{
X#ifdef DEBUG
X _at(x, y);
X#else
X if(y==lasty) {
X if(x!=lastx) {
X if(x<lastx && lastx-x<tglen)
X while(x<lastx) {
X putchar('\b');
X lastx--;
X }
X else if(x>lastx && x-lastx<tglen)
X while(x>lastx) {
X putchar(0x7F&newscreen[lasty][lastx]);
X lastx++;
X }
X else
X _at(x, y);
X }
X } else
X _at(x, y);
X#endif
X c &= 0x7F;
X putchar(c);
X if(c >= ' ' && c != '\177')
X lastx++;
X if(lastx>=co) {
X lastx -= co;
X lasty++;
X }
X}
X
X_at(x, y)
Xint x, y;
X{
X extern void outc();
X
X tputs(tgoto(cm, x, y), 1, outc); /* handle padding */
X lastx = x;
X lasty = y;
X}
X
Xvoid
Xoutc(c)
Xregister c;
X{
X putc(c&0x7F, stdout);
X}
X
Xtinit(name)
Xchar *name;
X{
X static char junkbuf[1024], *junkptr;
X char tbuf[1024];
X int intr();
X
X junkptr = junkbuf;
X
X tgetent(tbuf, name);
X
X if (!tgetflag("bs")) /* is backspace not used? */
X BC = tgetstr("bc",&junkptr); /* find out what is */
X else
X BC = "\b"; /* make a backspace handy */
X if (tgetstr("pc", &junkptr) != NULL)
X PC = *junkptr; /* set pad character */
X else
X PC = '\0';
X UP = tgetstr("up", &junkptr);
X cm = tgetstr("cm", &junkptr);
X if (cm == NULL) {
X printf("Can't rot on dumb terminals.\n");
X exit(1);
X }
X cl = tgetstr("cl", &junkptr);
X ti = tgetstr("ti", &junkptr);
X te = tgetstr("te", &junkptr);
X li = min(tgetnum("li"), MAXLI);
X if (li == -1)
X li = 24;
X co = min(tgetnum("co"), MAXCOL);
X if (co == -1)
X co = 80;
X tglen = strlen(tgoto(cm, co-1, li-1));
X}
X
Xtend()
X{
X if(te != NULL) outs(te);
X _at(0, li-1);
X putchar('\n');
X fflush(stdout);
X}
X
Xreadscreen(fp)
XFILE *fp;
X{
X int line, column, p;
X char tmp[256];
X
X for(line=0; line<li; line++)
X for(column=0; column<co; column++)
X {
X newscreen[line][column] = screen[line][column] = ' ';
X }
X strncpy(&newscreen[li-1][0], "--Hit CR--", 10);
X for(column=0; column<co; column++)
X newscreen[li][column] = screen[li][column] = '*';
X line=0;
X while(line<li-1) {
X if(!fgets(tmp, 256, fp))
X return(max(line,column/COLRATIO));
X
X for(column=0, p=0; tmp[p]; p++) {
X tmp[p] &= ~0200;
X if(tmp[p] < ' ' || tmp[p] == 127)
X switch(tmp[p]) {
X case '\t':
X while(++column % 8)
X continue;
X break;
X case '\n':
X column = 0;
X line++;
X break;
X default:
X newscreen[line][column] = '^';
X column++;
X if(column>=co) {
X column -= co;
X line++;
X }
X newscreen[line][column] =
X (tmp[p]+'@') & 127;
X column++;
X break;
X }
X else {
X newscreen[line][column] = tmp[p];
X column++;
X }
X if(column >= co) {
X column -= co;
X line++;
X }
X if(line >= li)
X break;
X }
X }
X for(column=0; column<co; column++)
X newscreen[li][column] = screen[li][column] = '*';
X return(max(line,column/COLRATIO));
X}
X
Xdrawscreen()
X{
X lastx = lasty = 0;
X outs(cl);
X update();
X}
X
Xupdate() /* copy new screen back to old screen */
X{
X int l, c;
X
X for(l=0; l<li; l++)
X for(c=0; c<co; c++)
X if(screen[l][c] != newscreen[l][c]) {
X if((screen[l][c] & ~0200) !=
X (newscreen[l][c] & ~0200))
X at(c, l, newscreen[l][c]);
X screen[l][c] = newscreen[l][c];
X }
X}
X
Xdrop(line, column)
Xint line, column;
X{
X struct _c *hold, *temp;
X
X if(line<0 || line>=li || column<0 || column>=co ||
X (line>=li-2 && column >= co-1) || /* scroll potential */
X screen[line][column]==' ' || /* empty */
X screen[line][column] & 0200) /* already in list */
X return;
X if(screen[line+1][column]!=' ' &&
X (column==co-1 ||screen[line+1][column+1]!=' ') &&
X (column==0 ||screen[line+1][column-1]!=' '))
X return;
X
X hold = (struct _c *) malloc(sizeof(struct _c));
X hold -> c_next;
X hold -> c_column = column;
X hold -> c_line = line;
X hold -> c_mark = 0;
X screen[line][column] |= 0200;
X
X for(temp = clist; temp && temp->c_next; temp=temp->c_next)
X if(!(rand()&1111))
X break;
X if(temp) {
X hold->c_next = temp->c_next;
X temp->c_next = hold;
X } else {
X hold->c_next = clist;
X clist = hold;
X }
X}
X
Xdrops()
X{
X int l, c;
X struct _c *hold;
X for(hold = clist; hold; hold=hold->c_next) {
X int line = hold->c_line, column=hold->c_column;
X if(line>= li-2 && column>=co-1) {
X newscreen[line][column] &= ~0200;
X screen[line][column] &= ~0200;
X hold->c_mark = 1;
X continue;
X }
X if(newscreen[line+1][column+1] == ' ' &&
X newscreen[line+1][column-1] == ' ')
X drop(line+1, column);
X drop(line, column+1);
X drop(line-1, column);
X drop(line, column-1);
X if(newscreen[line+1][column]==' ' ||
X (packflag &&
X newscreen[line+1][column]==(screen[line][column]&~0200)
X )
X ) {
X newscreen[line+1][column] = screen[line][column];
X newscreen[line][column] = ' ';
X line++;
X } else if(rand()&01000) {
X if(column>0 && newscreen[line][column-1] == ' ' &&
X newscreen[line+1][column-1]==' ') {
X newscreen[line][column-1] =
X screen[line][column];
X newscreen[line][column] = ' ';
X column--;
X }
X else if(column<co-1 &&
X newscreen[line][column+1] == ' ' &&
X newscreen[line+1][column+1]==' ') {
X newscreen[line][column+1] =
X screen[line][column];
X newscreen[line][column] = ' ';
X column++;
X }
X else {
X screen[line][column] &= ~0200;
X newscreen[line][column] &= ~0200;
X hold -> c_mark = 1;
X }
X } else {
X if(column<co-1 && newscreen[line][column+1] == ' ' &&
X newscreen[line+1][column+1]==' ') {
X newscreen[line][column+1] =
X screen[line][column];
X newscreen[line][column] = ' ';
X column++;
X }
X else if(column>0 && newscreen[line][column-1] == ' ' &&
X newscreen[line+1][column-1]==' ') {
X newscreen[line][column-1] =
X screen[line][column];
X newscreen[line][column] = ' ';
X column--;
X }
X else {
X newscreen[line][column] &= ~0200;
X screen[line][column] &= ~0200;
X hold -> c_mark = 1;
X }
X }
X hold -> c_column = column;
X hold -> c_line = line;
X fflush(stdout);
X }
X
X while(clist && clist->c_mark) {
X struct _c *p = clist;
X clist = clist -> c_next;
X free(p);
X }
X hold = clist;
X while(hold && hold->c_next)
X if(hold->c_next->c_mark) {
X struct _c *p = hold->c_next;
X hold->c_next = p->c_next;
X free(p);
X } else
X hold=hold->c_next;
X}
X
Xdroplet(line, column)
Xint line, column;
X{
X int ret;
X if(line==li-1)
X return 0;
X while(column>=0 &&
X screen[line][column]!=' ' &&
X screen[line+1][column]==' ')
X column--;
X column++;
X while(column<co &&
X screen[line][column]!=' ' &&
X screen[line+1][column]==' ')
X drop(line, column++);
X ret = clist != 0;
X while(clist) {
X drops();
X update();
X }
X return ret;
X}
X
Xdropscreen()
X{
X int column, line;
X int rubbish = 0, count = 0;
X
X do {
X int start, limit, incr;
X count++;
X rubbish = 0;
X if(count&1) { start=li-2; limit=0; incr = -1; }
X else { start=0; limit=li-2; incr=1; }
X for(line=start; line!=limit && !rubbish; line+=incr) {
X if(line&1)
X for(column=0; column<co && !rubbish; column++)
X rubbish += droplet(line, column);
X else
X for(column=co-1; column>=0 && !rubbish; column--)
X rubbish += droplet(line, column);
X }
X } while(rubbish);
X}
X
Xdropf(file)
Xchar *file;
X{
X FILE *fp;
X
X if(!(fp = fopen(file, "r"))) {
X perror(file);
X return -1;
X }
X fdropf(fp);
X}
X
Xfdropf(fp)
XFILE *fp;
X{
X int i,lines;
X
X while(!feof(fp)) {
X lines=readscreen(fp);
X drawscreen();
X fflush(stdout);
X if(more(lines) == 0) { /* Timed out */
X for(i=0; i<20; i++)
X droplet((rand()>>4) % (li-1), (rand()>>4) % co);
X dropscreen();
X }
X }
X}
X
Xchar timed_out;
X
Xint tmo()
X{
X timed_out = 1;
X}
X
Xmore(lines)
Xint lines;
X{
X char c;
X
X timed_out = 0;
X signal(SIGALRM, tmo);
X alarm(max(lines/SLEEPFACTOR,1));
X while(!timed_out) {
X read(0, &c, 1);
X if(c=='\n' || c=='\r') break;
X }
X alarm(0);
X return !timed_out;
X}
X
Xouts(s)
Xchar *s;
X{
X fputs(s, stdout);
X}
X
Xmin(a, b)
Xint a, b;
X{
X if(a<b) return a;
X return b;
X}
X
Xmax(a, b)
Xint a, b;
X{
X if(a>b) return a;
X return b;
X}
END_OF_FILE
if test 10602 -ne `wc -c <'rot.c'`; then
echo shar: \"'rot.c'\" unpacked with wrong size!
fi
# end of 'rot.c'
fi
echo shar: End of shell archive.
exit 0
--
Peter da Silva. `-_-' peter at ferranti.com
+1 713 274 5180. 'U` "Have you hugged your wolf today?"
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