4.4BSD/usr/src/games/hack/hack.pager.c
/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
/* hack.pager.c - version 1.0.3 */
/* This file contains the command routine dowhatis() and a pager. */
/* Also readmail() and doshell(), and generally the things that
contact the outside world. */
#include <sys/types.h>
#include <sys/signal.h>
#include <stdio.h>
#include "hack.h"
extern int CO, LI; /* usually COLNO and ROWNO+2 */
extern char *CD;
extern char quitchars[];
extern char *getenv(), *getlogin();
void done1();
dowhatis()
{
FILE *fp;
char bufr[BUFSZ+6];
register char *buf = &bufr[6], *ep, q;
extern char readchar();
if(!(fp = fopen(DATAFILE, "r")))
pline("Cannot open data file!");
else {
pline("Specify what? ");
q = readchar();
if(q != '\t')
while(fgets(buf,BUFSZ,fp))
if(*buf == q) {
ep = index(buf, '\n');
if(ep) *ep = 0;
/* else: bad data file */
/* Expand tab 'by hand' */
if(buf[1] == '\t'){
buf = bufr;
buf[0] = q;
(void) strncpy(buf+1, " ", 7);
}
pline(buf);
if(ep[-1] == ';') {
pline("More info? ");
if(readchar() == 'y') {
page_more(fp,1); /* does fclose() */
return(0);
}
}
(void) fclose(fp); /* kopper@psuvax1 */
return(0);
}
pline("I've never heard of such things.");
(void) fclose(fp);
}
return(0);
}
/* make the paging of a file interruptible */
static int got_intrup;
void
intruph(){
got_intrup++;
}
/* simple pager, also used from dohelp() */
page_more(fp,strip)
FILE *fp;
int strip; /* nr of chars to be stripped from each line (0 or 1) */
{
register char *bufr, *ep;
sig_t prevsig = signal(SIGINT, intruph);
set_pager(0);
bufr = (char *) alloc((unsigned) CO);
bufr[CO-1] = 0;
while(fgets(bufr,CO-1,fp) && (!strip || *bufr == '\t') && !got_intrup){
ep = index(bufr, '\n');
if(ep)
*ep = 0;
if(page_line(bufr+strip)) {
set_pager(2);
goto ret;
}
}
set_pager(1);
ret:
free(bufr);
(void) fclose(fp);
(void) signal(SIGINT, prevsig);
got_intrup = 0;
}
static boolean whole_screen = TRUE;
#define PAGMIN 12 /* minimum # of lines for page below level map */
set_whole_screen() { /* called in termcap as soon as LI is known */
whole_screen = (LI-ROWNO-2 <= PAGMIN || !CD);
}
#ifdef NEWS
readnews() {
register int ret;
whole_screen = TRUE; /* force a docrt(), our first */
ret = page_file(NEWS, TRUE);
set_whole_screen();
return(ret); /* report whether we did docrt() */
}
#endif NEWS
set_pager(mode)
register int mode; /* 0: open 1: wait+close 2: close */
{
static boolean so;
if(mode == 0) {
if(!whole_screen) {
/* clear topline */
clrlin();
/* use part of screen below level map */
curs(1, ROWNO+4);
} else {
cls();
}
so = flags.standout;
flags.standout = 1;
} else {
if(mode == 1) {
curs(1, LI);
more();
}
flags.standout = so;
if(whole_screen)
docrt();
else {
curs(1, ROWNO+4);
cl_eos();
}
}
}
page_line(s) /* returns 1 if we should quit */
register char *s;
{
extern char morc;
if(cury == LI-1) {
if(!*s)
return(0); /* suppress blank lines at top */
putchar('\n');
cury++;
cmore("q\033");
if(morc) {
morc = 0;
return(1);
}
if(whole_screen)
cls();
else {
curs(1, ROWNO+4);
cl_eos();
}
}
puts(s);
cury++;
return(0);
}
/*
* Flexible pager: feed it with a number of lines and it will decide
* whether these should be fed to the pager above, or displayed in a
* corner.
* Call:
* cornline(0, title or 0) : initialize
* cornline(1, text) : add text to the chain of texts
* cornline(2, morcs) : output everything and cleanup
* cornline(3, 0) : cleanup
*/
cornline(mode, text)
int mode;
char *text;
{
static struct line {
struct line *next_line;
char *line_text;
} *texthead, *texttail;
static int maxlen;
static int linect;
register struct line *tl;
if(mode == 0) {
texthead = 0;
maxlen = 0;
linect = 0;
if(text) {
cornline(1, text); /* title */
cornline(1, ""); /* blank line */
}
return;
}
if(mode == 1) {
register int len;
if(!text) return; /* superfluous, just to be sure */
linect++;
len = strlen(text);
if(len > maxlen)
maxlen = len;
tl = (struct line *)
alloc((unsigned)(len + sizeof(struct line) + 1));
tl->next_line = 0;
tl->line_text = (char *)(tl + 1);
(void) strcpy(tl->line_text, text);
if(!texthead)
texthead = tl;
else
texttail->next_line = tl;
texttail = tl;
return;
}
/* --- now we really do it --- */
if(mode == 2 && linect == 1) /* topline only */
pline(texthead->line_text);
else
if(mode == 2) {
register int curline, lth;
if(flags.toplin == 1) more(); /* ab@unido */
remember_topl();
lth = CO - maxlen - 2; /* Use full screen width */
if (linect < LI && lth >= 10) { /* in a corner */
home ();
cl_end ();
flags.toplin = 0;
curline = 1;
for (tl = texthead; tl; tl = tl->next_line) {
curs (lth, curline);
if(curline > 1)
cl_end ();
putsym(' ');
putstr (tl->line_text);
curline++;
}
curs (lth, curline);
cl_end ();
cmore (text);
home ();
cl_end ();
docorner (lth, curline-1);
} else { /* feed to pager */
set_pager(0);
for (tl = texthead; tl; tl = tl->next_line) {
if (page_line (tl->line_text)) {
set_pager(2);
goto cleanup;
}
}
if(text) {
cgetret(text);
set_pager(2);
} else
set_pager(1);
}
}
cleanup:
while(tl = texthead) {
texthead = tl->next_line;
free((char *) tl);
}
}
dohelp()
{
char c;
pline ("Long or short help? ");
while (((c = readchar ()) != 'l') && (c != 's') && !index(quitchars,c))
bell ();
if (!index(quitchars, c))
(void) page_file((c == 'l') ? HELP : SHELP, FALSE);
return(0);
}
page_file(fnam, silent) /* return: 0 - cannot open fnam; 1 - otherwise */
register char *fnam;
boolean silent;
{
#ifdef DEF_PAGER /* this implies that UNIX is defined */
{
/* use external pager; this may give security problems */
register int fd = open(fnam, 0);
if(fd < 0) {
if(!silent) pline("Cannot open %s.", fnam);
return(0);
}
if(child(1)){
extern char *catmore;
/* Now that child() does a setuid(getuid()) and a chdir(),
we may not be able to open file fnam anymore, so make
it stdin. */
(void) close(0);
if(dup(fd)) {
if(!silent) printf("Cannot open %s as stdin.\n", fnam);
} else {
execl(catmore, "page", (char *) 0);
if(!silent) printf("Cannot exec %s.\n", catmore);
}
exit(1);
}
(void) close(fd);
}
#else DEF_PAGER
{
FILE *f; /* free after Robert Viduya */
if ((f = fopen (fnam, "r")) == (FILE *) 0) {
if(!silent) {
home(); perror (fnam); flags.toplin = 1;
pline ("Cannot open %s.", fnam);
}
return(0);
}
page_more(f, 0);
}
#endif DEF_PAGER
return(1);
}
#ifdef UNIX
#ifdef SHELL
dosh(){
register char *str;
if(child(0)) {
if(str = getenv("SHELL"))
execl(str, str, (char *) 0);
else
execl("/bin/sh", "sh", (char *) 0);
pline("sh: cannot execute.");
exit(1);
}
return(0);
}
#endif SHELL
#ifdef NOWAITINCLUDE
union wait { /* used only for the cast (union wait *) 0 */
int w_status;
struct {
unsigned short w_Termsig:7;
unsigned short w_Coredump:1;
unsigned short w_Retcode:8;
} w_T;
};
#else
#ifdef BSD
#include <sys/wait.h>
#else
#include <wait.h>
#endif BSD
#endif NOWAITINCLUDE
child(wt) {
int status;
register int f;
f = fork();
if(f == 0){ /* child */
settty((char *) 0); /* also calls end_screen() */
(void) setuid(getuid());
(void) setgid(getgid());
#ifdef CHDIR
(void) chdir(getenv("HOME"));
#endif CHDIR
return(1);
}
if(f == -1) { /* cannot fork */
pline("Fork failed. Try again.");
return(0);
}
/* fork succeeded; wait for child to exit */
(void) signal(SIGINT,SIG_IGN);
(void) signal(SIGQUIT,SIG_IGN);
(void) wait(&status);
gettty();
setftty();
(void) signal(SIGINT,done1);
#ifdef WIZARD
if(wizard) (void) signal(SIGQUIT,SIG_DFL);
#endif WIZARD
if(wt) getret();
docrt();
return(0);
}
#endif UNIX