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- /*
- * Copyright (c) 1980 Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
- #ifndef lint
- static char sccsid[] = "@(#)move.c 5.8 (Berkeley) 2/28/91";
- #endif /* not lint */
-
- /*************************************************************************
- *
- * MOVE LIBRARY
- *
- * This set of subroutines moves a cursor to a predefined
- * location, independent of the terminal type. If the
- * terminal has an addressable cursor, it uses it. If
- * not, it optimizes for tabs (currently) even if you don't
- * have them.
- *
- * At all times the current address of the cursor must be maintained,
- * and that is available as structure cursor.
- *
- * The following calls are allowed:
- * move(sp) move to point sp.
- * up() move up one line.
- * down() move down one line.
- * bs() move left one space (except column 0).
- * nd() move right one space(no write).
- * clear() clear screen.
- * home() home.
- * ll() move to lower left corner of screen.
- * cr() carriage return (no line feed).
- * pr() just like standard printf, but keeps track
- * of cursor position. (Uses pstring).
- * apr() same as printf, but first argument is &point.
- * (Uses pstring).
- * pstring(s) output the string of printing characters.
- * However, '\r' is interpreted to mean return
- * to column of origination AND do linefeed.
- * '\n' causes <cr><lf>.
- * putpad(str) calls tputs to output character with proper
- * padding.
- * outch() the output routine for a character used by
- * tputs. It just calls putchar.
- * pch(ch) output character to screen and update
- * cursor address (must be a standard
- * printing character). WILL SCROLL.
- * pchar(ps,ch) prints one character if it is on the
- * screen at the specified location;
- * otherwise, dumps it.(no wrap-around).
- *
- * getcap() initializes strings for later calls.
- * cap(string) outputs the string designated in the termcap
- * data base. (Should not move the cursor.)
- * done() returns the terminal to intial state and exits.
- *
- * point(&p,x,y) return point set to x,y.
- *
- * baudrate(x) returns the baudrate of the terminal.
- * delay(t) causes an approximately constant delay
- * independent of baudrate.
- * Duration is ~ t/20 seconds.
- *
- ******************************************************************************/
-
- #include <stdarg.h>
- #include "snake.h"
-
- int CMlength;
- int NDlength;
- int BSlength;
- int delaystr[10];
- short ospeed;
-
- static char str[80];
-
- move(sp)
- struct point *sp;
- {
- int distance;
- int tabcol,ct;
- struct point z;
-
- if (sp->line <0 || sp->col <0 || sp->col > COLUMNS){
- pr("move to [%d,%d]?",sp->line,sp->col);
- return;
- }
- if (sp->line >= LINES){
- move(point(&z,sp->col,LINES-1));
- while(sp->line-- >= LINES)putchar('\n');
- return;
- }
-
- if (CM != 0) {
- char *cmstr = tgoto(CM, sp->col, sp->line);
-
- CMlength = strlen(cmstr);
- if(cursor.line == sp->line){
- distance = sp->col - cursor.col;
- if(distance == 0)return; /* Already there! */
- if(distance > 0){ /* Moving to the right */
- if(distance*NDlength < CMlength){
- right(sp);
- return;
- }
- if(TA){
- ct=sp->col&7;
- tabcol=(cursor.col|7)+1;
- do{
- ct++;
- tabcol=(tabcol|7)+1;
- }
- while(tabcol<sp->col);
- if(ct<CMlength){
- right(sp);
- return;
- }
- }
- } else { /* Moving to the left */
- if (-distance*BSlength < CMlength){
- gto(sp);
- return;
- }
- }
- if(sp->col < CMlength){
- cr();
- right(sp);
- return;
- }
- /* No more optimizations on same row. */
- }
- distance = sp->col - cursor.col;
- distance = distance > 0 ?
- distance*NDlength : -distance * BSlength;
- if (distance < 0)
- pr("ERROR: distance is negative: %d",distance);
- distance += abs(sp->line - cursor.line);
- if(distance >= CMlength){
- putpad(cmstr);
- cursor.line = sp->line;
- cursor.col = sp->col;
- return;
- }
- }
-
- /*
- * If we get here we have a terminal that can't cursor
- * address but has local motions or one which can cursor
- * address but can get there quicker with local motions.
- */
- gto(sp);
- }
- gto(sp)
- struct point *sp;
- {
-
- int distance,f,tfield,j;
-
- if (cursor.line > LINES || cursor.line <0 ||
- cursor.col <0 || cursor.col > COLUMNS)
- pr("ERROR: cursor is at %d,%d\n",
- cursor.line,cursor.col);
- if (sp->line > LINES || sp->line <0 ||
- sp->col <0 || sp->col > COLUMNS)
- pr("ERROR: target is %d,%d\n",sp->line,sp->col);
- tfield = (sp->col) >> 3;
- if (sp->line == cursor.line){
- if (sp->col > cursor.col)right(sp);
- else{
- distance = (cursor.col -sp->col)*BSlength;
- if (((TA) &&
- (distance > tfield+((sp->col)&7)*NDlength)
- ) ||
- (((cursor.col)*NDlength) < distance)
- ){
- cr();
- right(sp);
- }
- else{
- while(cursor.col > sp->col) bs();
- }
- }
- return;
- }
- /*must change row */
- if (cursor.col - sp->col > (cursor.col >> 3)){
- if (cursor.col == 0)f = 0;
- else f = -1;
- }
- else f = cursor.col >> 3;
- if (((sp->line << 1) + 1 < cursor.line - f) && (HO != 0)){
- /*
- * home quicker than rlf:
- * (sp->line + f > cursor.line - sp->line)
- */
- putpad(HO);
- cursor.col = cursor.line = 0;
- gto(sp);
- return;
- }
- if (((sp->line << 1) > cursor.line + LINES+1 + f) && (LL != 0)){
- /* home,rlf quicker than lf
- * (LINES+1 - sp->line + f < sp->line - cursor.line)
- */
- if (cursor.line > f + 1){
- /* is home faster than wraparound lf?
- * (cursor.line + 20 - sp->line > 21 - sp->line + f)
- */
- ll();
- gto(sp);
- return;
- }
- }
- if ((LL != 0) && (sp->line > cursor.line + (LINES >> 1) - 1))
- cursor.line += LINES;
- while(sp->line > cursor.line)down();
- while(sp->line < cursor.line)up();
- gto(sp); /*can recurse since cursor.line = sp->line */
- }
-
- right(sp)
- struct point *sp;
- {
- int field,tfield;
- int tabcol,strlength;
-
- if (sp->col < cursor.col)
- pr("ERROR:right() can't move left\n");
- if(TA){ /* If No Tabs: can't send tabs because ttydrive
- * loses count with control characters.
- */
- field = cursor.col >> 3;
- /*
- * This code is useful for a terminal which wraps around on backspaces.
- * (Mine does.) Unfortunately, this is not specified in termcap, and
- * most terminals don't work that way. (Of course, most terminals
- * have addressible cursors, too).
- */
- if (BW && (CM == 0) &&
- ((sp->col << 1) - field > (COLUMNS - 8) << 1 )
- ){
- if (cursor.line == 0){
- outch('\n');
- }
- outch('\r');
- cursor.col = COLUMNS + 1;
- while(cursor.col > sp->col)bs();
- if (cursor.line != 0) outch('\n');
- return;
- }
-
- tfield = sp->col >> 3;
-
- while (field < tfield){
- putpad(TA);
- cursor.col = ++field << 3;
- }
- tabcol = (cursor.col|7) + 1;
- strlength = (tabcol - sp->col)*BSlength + 1;
- /* length of sequence to overshoot */
- if (((sp->col - cursor.col)*NDlength > strlength) &&
- (tabcol < COLUMNS)
- ){
- /*
- * Tab past and backup
- */
- putpad(TA);
- cursor.col = (cursor.col | 7) + 1;
- while(cursor.col > sp->col)bs();
- }
- }
- while (sp->col > cursor.col){
- nd();
- }
- }
-
- cr(){
- outch('\r');
- cursor.col = 0;
- }
-
- clear(){
- int i;
-
- if (CL){
- putpad(CL);
- cursor.col=cursor.line=0;
- } else {
- for(i=0; i<LINES; i++) {
- putchar('\n');
- }
- cursor.line = LINES - 1;
- home();
- }
- }
-
- home(){
- struct point z;
-
- if(HO != 0){
- putpad(HO);
- cursor.col = cursor.line = 0;
- return;
- }
- z.col = z.line = 0;
- move(&z);
- }
-
- ll(){
- int j,l;
- struct point z;
-
- l = lcnt + 2;
- if(LL != NULL && LINES==l){
- putpad(LL);
- cursor.line = LINES-1;
- cursor.col = 0;
- return;
- }
- z.col = 0;
- z.line = l-1;
- move(&z);
- }
-
- up(){
- putpad(UP);
- cursor.line--;
- }
-
- down(){
- putpad(DO);
- cursor.line++;
- if (cursor.line >= LINES)cursor.line=LINES-1;
- }
- bs(){
- if (cursor.col > 0){
- putpad(BS);
- cursor.col--;
- }
- }
-
- nd(){
- putpad(ND);
- cursor.col++;
- if (cursor.col == COLUMNS+1){
- cursor.line++;
- cursor.col = 0;
- if (cursor.line >= LINES)cursor.line=LINES-1;
- }
- }
-
- pch(c)
- {
- outch(c);
- if(++cursor.col >= COLUMNS && AM) {
- cursor.col = 0;
- ++cursor.line;
- }
- }
-
- apr(ps, fmt)
- struct point *ps;
- char *fmt;
- {
- struct point p;
- va_list ap;
-
- p.line = ps->line+1; p.col = ps->col+1;
- move(&p);
- va_start(ap, fmt);
- (void)vsprintf(str, fmt, ap);
- va_end(ap);
- pstring(str);
- }
-
- pr(fmt)
- char *fmt;
- {
- va_list ap;
-
- va_start(ap, fmt);
- (void)vsprintf(str, fmt, ap);
- va_end(ap);
- pstring(str);
- }
-
- pstring(s)
- char *s;{
- struct point z;
- int stcol;
-
- stcol = cursor.col;
- while (s[0] != '\0'){
- switch (s[0]){
- case '\n':
- move(point(&z,0,cursor.line+1));
- break;
- case '\r':
- move(point(&z,stcol,cursor.line+1));
- break;
- case '\t':
- z.col = (((cursor.col + 8) >> 3) << 3);
- z.line = cursor.line;
- move(&z);
- break;
- case '\b':
- bs();
- break;
- case CTRL('g'):
- outch(CTRL('g'));
- break;
- default:
- if (s[0] < ' ')break;
- pch(s[0]);
- }
- s++;
- }
- }
-
- pchar(ps,ch)
- struct point *ps;
- char ch;{
- struct point p;
- p.col = ps->col + 1; p.line = ps->line + 1;
- if (
- (p.col >= 0) &&
- (p.line >= 0) &&
- (
- (
- (p.line < LINES) &&
- (p.col < COLUMNS)
- ) ||
- (
- (p.col == COLUMNS) &&
- (p.line < LINES-1)
- )
- )
- ){
- move(&p);
- pch(ch);
- }
- }
-
-
- outch(c)
- {
- putchar(c);
- }
-
- putpad(str)
- char *str;
- {
- if (str)
- tputs(str, 1, outch);
- }
- baudrate()
- {
-
- switch (orig.sg_ospeed){
- case B300:
- return(300);
- case B1200:
- return(1200);
- case B4800:
- return(4800);
- case B9600:
- return(9600);
- default:
- return(0);
- }
- }
- delay(t)
- int t;
- {
- int k,j;
-
- k = baudrate() * t / 300;
- for(j=0;j<k;j++){
- putchar(PC);
- }
- }
-
- done()
- {
- cook();
- exit(0);
- }
-
- cook()
- {
- delay(1);
- putpad(TE);
- putpad(KE);
- fflush(stdout);
- stty(0, &orig);
- #ifdef TIOCSLTC
- ioctl(0, TIOCSLTC, &olttyc);
- #endif
- }
-
- raw()
- {
- stty(0, &new);
- #ifdef TIOCSLTC
- ioctl(0, TIOCSLTC, &nlttyc);
- #endif
- }
-
- struct point *point(ps,x,y)
- struct point *ps;
- int x,y;
- {
- ps->col=x;
- ps->line=y;
- return(ps);
- }
-
- char *ap;
-
- getcap()
- {
- char *getenv();
- char *term;
- char *xPC;
- struct point z;
- void stop();
-
- term = getenv("TERM");
- if (term==0) {
- fprintf(stderr, "No TERM in environment\n");
- exit(1);
- }
-
- switch (tgetent(tbuf, term)) {
- case -1:
- fprintf(stderr, "Cannot open termcap file\n");
- exit(2);
- case 0:
- fprintf(stderr, "%s: unknown terminal", term);
- exit(3);
- }
-
- ap = tcapbuf;
-
- LINES = tgetnum("li");
- COLUMNS = tgetnum("co");
- if (!lcnt)
- lcnt = LINES - 2;
- if (!ccnt)
- ccnt = COLUMNS - 3;
-
- AM = tgetflag("am");
- BW = tgetflag("bw");
-
- ND = tgetstr("nd", &ap);
- UP = tgetstr("up", &ap);
-
- DO = tgetstr("do", &ap);
- if (DO == 0)
- DO = "\n";
-
- BS = tgetstr("bc", &ap);
- if (BS == 0 && tgetflag("bs"))
- BS = "\b";
- if (BS)
- xBC = *BS;
-
- TA = tgetstr("ta", &ap);
- if (TA == 0 && tgetflag("pt"))
- TA = "\t";
-
- HO = tgetstr("ho", &ap);
- CL = tgetstr("cl", &ap);
- CM = tgetstr("cm", &ap);
- LL = tgetstr("ll", &ap);
-
- KL = tgetstr("kl", &ap);
- KR = tgetstr("kr", &ap);
- KU = tgetstr("ku", &ap);
- KD = tgetstr("kd", &ap);
- Klength = strlen(KL);
- /* NOTE: If KL, KR, KU, and KD are not
- * all the same length, some problems
- * may arise, since tests are made on
- * all of them together.
- */
-
- TI = tgetstr("ti", &ap);
- TE = tgetstr("te", &ap);
- KS = tgetstr("ks", &ap);
- KE = tgetstr("ke", &ap);
-
- xPC = tgetstr("pc", &ap);
- if (xPC)
- PC = *xPC;
-
- NDlength = strlen(ND);
- BSlength = strlen(BS);
- if ((CM == 0) &&
- (HO == 0 | UP==0 || BS==0 || ND==0)) {
- fprintf(stderr, "Terminal must have addressible ");
- fprintf(stderr, "cursor or home + 4 local motions\n");
- exit(5);
- }
- if (tgetflag("os")) {
- fprintf(stderr, "Terminal must not overstrike\n");
- exit(5);
- }
- if (LINES <= 0 || COLUMNS <= 0) {
- fprintf(stderr, "Must know the screen size\n");
- exit(5);
- }
-
- gtty(0, &orig);
- new=orig;
- new.sg_flags &= ~(ECHO|CRMOD|ALLDELAY|XTABS);
- new.sg_flags |= CBREAK;
- signal(SIGINT,stop);
- ospeed = orig.sg_ospeed;
- #ifdef TIOCGLTC
- ioctl(0, TIOCGLTC, &olttyc);
- nlttyc = olttyc;
- nlttyc.t_suspc = '\377';
- nlttyc.t_dsuspc = '\377';
- #endif
- raw();
-
- if ((orig.sg_flags & XTABS) == XTABS) TA=0;
- putpad(KS);
- putpad(TI);
- point(&cursor,0,LINES-1);
- }
-