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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

Screenshots and source code from Hack are used under the CWI license.
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 /**/

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