Source:NetHack 2.2a/pager.c

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Below is the full text to pager.c from the source code of NetHack 2.2a. To link to a particular line, write [[NetHack 2.2a/pager.c#line123]], for example.

Warning! This is the source code from an old release. For the latest release, see Source code

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1.    /*	SCCS Id: @(#)pager.c	2.1	87/11/09
2.    /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
3.    
4.    /* This file contains the command routine dowhatis() and a pager. */
5.    /* Also readmail() and doshell(), and generally the things that
6.       contact the outside world. */
7.    
8.    #include	<stdio.h>
9.    #include	<signal.h>
10.   #include	 "hack.h"
11.   extern int CO, LI;	/* usually COLNO and ROWNO+2 */
12.   extern char *CD;
13.   extern char quitchars[];
14.   extern char *getenv(), *getlogin();
15.   int done1();
16.   
17.   dowhatis()
18.   {
19.   	FILE *fp;
20.   	char bufr[BUFSZ+6];
21.   	register char *buf = &bufr[6], *ep, q;
22.   	extern char readchar();
23.   
24.   	if(!(fp = fopen(DATAFILE, "r")))
25.   		pline("Cannot open data file!");
26.   	else {
27.   #ifndef GRAPHICS
28.   		pline("Specify what? ");
29.   		q = readchar();
30.   #else
31.   		extern getpos();
32.   		coord	cc;
33.   		char	r;	
34.   
35.   		pline ("Specify unknown object by cursor ? [ynq] ");
36.   		while(!index("yYnNqQ", (q = readchar())) &&
37.   					      !index(quitchars, q))	bell();
38.   
39.   		if (q == 'n' || q == 'N') {
40.   			pline("Specify what? ");
41.   			r = readchar();
42.   		} else if (index(quitchars, q))
43.   			r = q;
44.   		else {
45.   			pline("Please move the cursor to the unknown object.");
46.   			getpos(&cc, TRUE, "the unknown object");
47.   			r = levl[cc.x][cc.y].scrsym;
48.   		}
49.   
50.   		if (r == showsyms.stone) q = defsyms.stone;
51.   		else if (r == showsyms.vwall) q = defsyms.vwall;
52.   		else if (r == showsyms.hwall) q = defsyms.hwall;
53.   		else if (r == showsyms.tlcorn) q = defsyms.tlcorn;
54.   		else if (r == showsyms.trcorn) q = defsyms.trcorn;
55.   		else if (r == showsyms.blcorn) q = defsyms.blcorn;
56.   		else if (r == showsyms.brcorn) q = defsyms.brcorn;
57.   		else if (r == showsyms.door) q = defsyms.door;
58.   		else if (r == showsyms.room) q = defsyms.room;
59.   		else if (r == showsyms.corr) q = defsyms.corr;
60.   		else if (r == showsyms.upstair) q = defsyms.upstair;
61.   		else if (r == showsyms.dnstair) q = defsyms.dnstair;
62.   		else if (r == showsyms.trap) q = defsyms.trap;
63.   #ifdef FOUNTAINS
64.   		else if (r == showsyms.pool) q = defsyms.pool;
65.   		else if (r == showsyms.fountain) q = defsyms.fountain;
66.   #endif
67.   #ifdef NEWCLASS
68.   		else if (r == showsyms.throne) q = defsyms.throne;
69.   #endif
70.   #ifdef SPIDERS
71.   		else if (r == showsyms.web) q = defsyms.web;
72.   		else
73.   		    q = r;
74.   #endif
75.   #endif /* GRAPHICS */
76.   #ifdef DGKMOD
77.   		if (index(quitchars, q)) {
78.   			(void) fclose(fp); /* sweet@scubed */
79.   			return(0);
80.   		}
81.   #endif
82.   #ifdef KJSMODS
83.   		if(q == '%') {
84.   			pline("%%       a piece of food");
85.   			(void) fclose(fp);
86.   			return(0);
87.   		} 
88.   #endif
89.   		if(q != '\t')
90.   		while(fgets(buf,BUFSZ,fp))
91.   		    if(*buf == q) {
92.   			ep = index(buf, '\n');
93.   			if(ep) *ep = 0;
94.   			/* else: bad data file */
95.   			/* Expand tab 'by hand' */
96.   			if(buf[1] == '\t'){
97.   				buf = bufr;
98.   #ifdef GRAPHICS
99.   				buf[0] = r;
100.  #else
101.  				buf[0] = q;
102.  #endif
103.  				(void) strncpy(buf+1, "       ", 7);
104.  			}
105.  			pline(buf);
106.  			if(ep[-1] == ';') {
107.  				pline("More info? ");
108.  				if(readchar() == 'y') {
109.  					page_more(fp,1); /* does fclose() */
110.  					return(0);
111.  				}
112.  			}
113.  			(void) fclose(fp); 	/* kopper@psuvax1 */
114.  			return(0);
115.  		    }
116.  		pline("I've never heard of such things.");
117.  		(void) fclose(fp);
118.  	}
119.  	return(0);
120.  }
121.  
122.  /* make the paging of a file interruptible */
123.  static int got_intrup;
124.  
125.  intruph(){
126.  	got_intrup++;
127.  }
128.  
129.  /* simple pager, also used from dohelp() */
130.  page_more(fp,strip)
131.  FILE *fp;
132.  int strip;	/* nr of chars to be stripped from each line (0 or 1) */
133.  {
134.  	register char *bufr, *ep;
135.  #ifdef DGK
136.  	/* There seems to be a bug in ANSI.SYS  The first tab character
137.  	 * after a clear screen sequence is not expanded correctly.  Thus
138.  	 * expand the tabs by hand -dgk
139.  	 */
140.  	int tabstop = 8, spaces;
141.  	char buf[BUFSIZ], *bufp, *bufrp;
142.  
143.  	set_pager(0);
144.  	bufr = (char *) alloc((unsigned) CO);
145.  	while (fgets(buf, BUFSIZ, fp) && (!strip || *buf == '\t')){
146.  		bufp = buf;
147.  		bufrp = bufr;
148.  		while (*bufp && *bufp != '\n') {
149.  			if (*bufp == '\t') {
150.  				spaces = tabstop - (bufrp - bufr) % tabstop;
151.  				while (spaces--)
152.  					*bufrp++ = ' ';
153.  				bufp++;
154.  			} else
155.  				*bufrp++ = *bufp++;
156.  		}
157.  		*bufrp = '\0';
158.  #else
159.  	int (*prevsig)() = signal(SIGINT, intruph);
160.  
161.  	set_pager(0);
162.  	bufr = (char *) alloc((unsigned) CO);
163.  	bufr[CO-1] = 0;
164.  	while(fgets(bufr,CO-1,fp) && (!strip || *bufr == '\t')){
165.  		ep = index(bufr, '\n');
166.  		if(ep)
167.  			*ep = 0;
168.  #endif /* DGK /**/
169.  		if(page_line(bufr+strip)) {
170.  			set_pager(2);
171.  			goto ret;
172.  		}
173.  	}
174.  	set_pager(1);
175.  ret:
176.  	free(bufr);
177.  	(void) fclose(fp);
178.  #ifndef DGK
179.  	(void) signal(SIGINT, prevsig);
180.  	got_intrup = 0;
181.  #endif
182.  }
183.  
184.  static boolean whole_screen = TRUE;
185.  #define	PAGMIN	12	/* minimum # of lines for page below level map */
186.  
187.  set_whole_screen() {	/* called in termcap as soon as LI is known */
188.  	whole_screen = (LI-ROWNO-2 <= PAGMIN || !CD);
189.  }
190.  
191.  #ifdef NEWS
192.  readnews() {
193.  	register int ret;
194.  
195.  	whole_screen = TRUE;	/* force a docrt(), our first */
196.  	ret = page_file(NEWS, TRUE);
197.  	set_whole_screen();
198.  	return(ret);		/* report whether we did docrt() */
199.  }
200.  #endif
201.  
202.  set_pager(mode)
203.  register int mode;	/* 0: open  1: wait+close  2: close */
204.  {
205.  	static boolean so;
206.  	if(mode == 0) {
207.  		if(!whole_screen) {
208.  			/* clear topline */
209.  			clrlin();
210.  			/* use part of screen below level map */
211.  			curs(1, ROWNO+4);
212.  		} else {
213.  			cls();
214.  		}
215.  		so = flags.standout;
216.  		flags.standout = 1;
217.  	} else {
218.  		if(mode == 1) {
219.  			curs(1, LI);
220.  			more();
221.  		}
222.  		flags.standout = so;
223.  		if(whole_screen)
224.  			docrt();
225.  		else {
226.  			curs(1, ROWNO+4);
227.  			cl_eos();
228.  		}
229.  	}
230.  }
231.  
232.  page_line(s)		/* returns 1 if we should quit */
233.  register char *s;
234.  {
235.  	extern char morc;
236.  
237.  	if(cury == LI-1) {
238.  		if(!*s)
239.  			return(0);	/* suppress blank lines at top */
240.  		putchar('\n');
241.  		cury++;
242.  		cmore("q\033");
243.  		if(morc) {
244.  			morc = 0;
245.  			return(1);
246.  		}
247.  		if(whole_screen)
248.  			cls();
249.  		else {
250.  			curs(1, ROWNO+4);
251.  			cl_eos();
252.  		}
253.  	}
254.  	xputs(s); xputc('\n');
255.  	cury++;
256.  	return(0);
257.  }
258.  
259.  /*
260.   * Flexible pager: feed it with a number of lines and it will decide
261.   * whether these should be fed to the pager above, or displayed in a
262.   * corner.
263.   * Call:
264.   *	cornline(0, title or 0)	: initialize
265.   *	cornline(1, text)	: add text to the chain of texts
266.   *	cornline(2, morcs)	: output everything and cleanup
267.   *	cornline(3, 0)		: cleanup
268.   */
269.  
270.  cornline(mode, text)
271.  int mode;
272.  char *text;
273.  {
274.  	static struct line {
275.  		struct line *next_line;
276.  		char *line_text;
277.  	} *texthead, *texttail;
278.  	static int maxlen;
279.  	static int linect;
280.  	register struct line *tl;
281.  
282.  	if(mode == 0) {
283.  		texthead = 0;
284.  		maxlen = 0;
285.  		linect = 0;
286.  		if(text) {
287.  			cornline(1, text);	/* title */
288.  			cornline(1, "");	/* blank line */
289.  		}
290.  		return;
291.  	}
292.  
293.  	if(mode == 1) {
294.  	    register int len;
295.  
296.  	    if(!text) return;	/* superfluous, just to be sure */
297.  	    linect++;
298.  	    len = strlen(text);
299.  	    if(len > maxlen)
300.  		maxlen = len;
301.  	    tl = (struct line *)
302.  		alloc((unsigned)(len + sizeof(struct line) + 1));
303.  	    tl->next_line = 0;
304.  	    tl->line_text = (char *)(tl + 1);
305.  	    (void) strcpy(tl->line_text, text);
306.  	    if(!texthead)
307.  		texthead = tl;
308.  	    else
309.  		texttail->next_line = tl;
310.  	    texttail = tl;
311.  	    return;
312.  	}
313.  
314.  	/* --- now we really do it --- */
315.  	if(mode == 2 && linect == 1)			    /* topline only */
316.  		pline(texthead->line_text);
317.  	else
318.  	if(mode == 2) {
319.  	    register int curline, lth;
320.  
321.  	    if(flags.toplin == 1) more();	/* ab@unido */
322.  	    remember_topl();
323.  
324.  	    lth = CO - maxlen - 2;		   /* Use full screen width */
325.  	    if (linect < LI && lth >= 10) {		     /* in a corner */
326.  		home ();
327.  		cl_end ();
328.  		flags.toplin = 0;
329.  		curline = 1;
330.  		for (tl = texthead; tl; tl = tl->next_line) {
331.  		    curs (lth, curline);
332.  		    if(curline > 1)
333.  			cl_end ();
334.  		    putsym(' ');
335.  		    xputs(tl->line_text);
336.  		    curline++;
337.  		}
338.  		curs (lth, curline);
339.  		cl_end ();
340.  		cmore (text);
341.  		home ();
342.  		cl_end ();
343.  		docorner (lth, curline-1);
344.  	    } else {					/* feed to pager */
345.  		set_pager(0);
346.  		for (tl = texthead; tl; tl = tl->next_line) {
347.  		    if (page_line (tl->line_text)) {
348.  			set_pager(2);
349.  			goto cleanup;
350.  		    }
351.  		}
352.  		if(text) {
353.  			cgetret(text);
354.  			set_pager(2);
355.  		} else
356.  			set_pager(1);
357.  	    }
358.  	}
359.  
360.  cleanup:
361.  	while(tl = texthead) {
362.  		texthead = tl->next_line;
363.  		free((char *) tl);
364.  	}
365.  }
366.  
367.  dohelp()
368.  {
369.  	char c;
370.  
371.  	pline ("Long or short help? ");
372.  	while (((c = readchar ()) != 'l') && (c != 's') && !index(quitchars,c))
373.  		bell ();
374.  	if (!index(quitchars, c))
375.  		(void) page_file((c == 'l') ? HELP : SHELP, FALSE);
376.  	return(0);
377.  }
378.  
379.  page_file(fnam, silent)	/* return: 0 - cannot open fnam; 1 - otherwise */
380.  register char *fnam;
381.  boolean silent;
382.  {
383.  #ifdef DEF_PAGER			/* this implies that UNIX is defined */
384.        {
385.  	/* use external pager; this may give security problems */
386.  
387.  	register int fd = open(fnam, 0);
388.  
389.  	if(fd < 0) {
390.  		if(!silent) pline("Cannot open %s.", fnam);
391.  		return(0);
392.  	}
393.  	if(child(1)){
394.  		extern char *catmore;
395.  
396.  		/* Now that child() does a setuid(getuid()) and a chdir(),
397.  		   we may not be able to open file fnam anymore, so make
398.  		   it stdin. */
399.  		(void) close(0);
400.  		if(dup(fd)) {
401.  			if(!silent) printf("Cannot open %s as stdin.\n", fnam);
402.  		} else {
403.  			execl(catmore, "page", (char *) 0);
404.  			if(!silent) printf("Cannot exec %s.\n", catmore);
405.  		}
406.  		exit(1);
407.  	}
408.  	(void) close(fd);
409.        }
410.  #else
411.        {
412.  	FILE *f;			/* free after Robert Viduya */
413.  
414.  	if ((f = fopen (fnam, "r")) == (FILE *) 0) {
415.  		if(!silent) {
416.  			home(); perror (fnam); flags.toplin = 1;
417.  			pline ("Cannot open %s.", fnam);
418.  		}
419.  		return(0);
420.  	}
421.  	page_more(f, 0);
422.        }
423.  #endif /* DEF_PAGER /**/
424.  
425.  	return(1);
426.  }
427.  
428.  #ifdef UNIX
429.  #ifdef SHELL
430.  dosh(){
431.  register char *str;
432.  	if(child(0)) {
433.  		if(str = getenv("SHELL"))
434.  			execl(str, str, (char *) 0);
435.  		else
436.  			execl("/bin/sh", "sh", (char *) 0);
437.  		pline("sh: cannot execute.");
438.  		exit(1);
439.  	}
440.  	return(0);
441.  }
442.  #endif /* SHELL /**/
443.  
444.  child(wt) {
445.  register int f = fork();
446.  	if(f == 0){		/* child */
447.  		settty((char *) 0);		/* also calls end_screen() */
448.  		(void) setuid(getuid());
449.  		(void) setgid(getgid());
450.  #ifdef CHDIR
451.  		(void) chdir(getenv("HOME"));
452.  #endif
453.  		return(1);
454.  	}
455.  	if(f == -1) {	/* cannot fork */
456.  		pline("Fork failed. Try again.");
457.  		return(0);
458.  	}
459.  	/* fork succeeded; wait for child to exit */
460.  	(void) signal(SIGINT,SIG_IGN);
461.  	(void) signal(SIGQUIT,SIG_IGN);
462.  	(void) wait((int *) 0);
463.  	gettty();
464.  	setftty();
465.  	(void) signal(SIGINT,done1);
466.  #ifdef WIZARD
467.  	if(wizard) (void) signal(SIGQUIT,SIG_DFL);
468.  #endif
469.  	if(wt) getret();
470.  	docrt();
471.  	return(0);
472.  }
473.  #endif /* UNIX /**/