1 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
2 /* hack.pager.c - version 1.0.3 */
3 /* $FreeBSD: src/games/hack/hack.pager.c,v 1.7 1999/11/16 02:57:09 billf Exp $ */
4 /* $DragonFly: src/games/hack/hack.pager.c,v 1.3 2004/11/06 12:29:17 eirikn Exp $ */
6 /* This file contains the command routine dowhatis() and a pager. */
7 /* Also readmail() and doshell(), and generally the things that
8 contact the outside world. */
10 #include <sys/types.h>
11 #include <sys/signal.h>
16 extern int CO, LI; /* usually COLNO and ROWNO+2 */
18 extern char quitchars[];
25 char *buf = &bufr[6], *ep, q;
26 extern char readchar();
28 if(!(fp = fopen(DATAFILE, "r")))
29 pline("Cannot open data file!");
31 pline("Specify what? ");
34 while(fgets(buf,BUFSZ,fp))
36 ep = index(buf, '\n');
38 /* else: bad data file */
39 /* Expand tab 'by hand' */
43 (void) strncpy(buf+1, " ", 7);
48 if(readchar() == 'y') {
49 page_more(fp,1); /* does fclose() */
53 (void) fclose(fp); /* kopper@psuvax1 */
56 pline("I've never heard of such things.");
62 /* make the paging of a file interruptible */
63 static int got_intrup;
70 /* simple pager, also used from dohelp() */
73 int strip; /* nr of chars to be stripped from each line (0 or 1) */
76 sig_t prevsig = signal(SIGINT, intruph);
79 bufr = (char *) alloc((unsigned) CO);
81 while(fgets(bufr,CO-1,fp) && (!strip || *bufr == '\t') && !got_intrup){
82 ep = index(bufr, '\n');
85 if(page_line(bufr+strip)) {
94 (void) signal(SIGINT, prevsig);
98 static boolean whole_screen = TRUE;
99 #define PAGMIN 12 /* minimum # of lines for page below level map */
101 set_whole_screen() { /* called in termcap as soon as LI is known */
102 whole_screen = (LI-ROWNO-2 <= PAGMIN || !CD);
109 whole_screen = TRUE; /* force a docrt(), our first */
110 ret = page_file(NEWS, TRUE);
112 return(ret); /* report whether we did docrt() */
117 int mode; /* 0: open 1: wait+close 2: close */
124 /* use part of screen below level map */
146 page_line(s) /* returns 1 if we should quit */
153 return(0); /* suppress blank lines at top */
174 * Flexible pager: feed it with a number of lines and it will decide
175 * whether these should be fed to the pager above, or displayed in a
178 * cornline(0, title or 0) : initialize
179 * cornline(1, text) : add text to the chain of texts
180 * cornline(2, morcs) : output everything and cleanup
181 * cornline(3, 0) : cleanup
189 struct line *next_line;
191 } *texthead, *texttail;
201 cornline(1, text); /* title */
202 cornline(1, ""); /* blank line */
210 if(!text) return; /* superfluous, just to be sure */
216 alloc((unsigned)(len + sizeof(struct line) + 1));
218 tl->line_text = (char *)(tl + 1);
219 (void) strcpy(tl->line_text, text);
223 texttail->next_line = tl;
228 /* --- now we really do it --- */
229 if(mode == 2 && linect == 1) /* topline only */
230 pline(texthead->line_text);
235 if(flags.toplin == 1) more(); /* ab@unido */
238 lth = CO - maxlen - 2; /* Use full screen width */
239 if (linect < LI && lth >= 10) { /* in a corner */
244 for (tl = texthead; tl; tl = tl->next_line) {
249 putstr (tl->line_text);
257 docorner (lth, curline-1);
258 } else { /* feed to pager */
260 for (tl = texthead; tl; tl = tl->next_line) {
261 if (page_line (tl->line_text)) {
275 while(tl = texthead) {
276 texthead = tl->next_line;
285 pline ("Long or short help? ");
286 while (((c = readchar ()) != 'l') && (c != 's') && !index(quitchars,c))
288 if (!index(quitchars, c))
289 (void) page_file((c == 'l') ? HELP : SHELP, FALSE);
293 page_file(fnam, silent) /* return: 0 - cannot open fnam; 1 - otherwise */
297 #ifdef DEF_PAGER /* this implies that UNIX is defined */
299 /* use external pager; this may give security problems */
301 int fd = open(fnam, 0);
304 if(!silent) pline("Cannot open %s.", fnam);
308 extern char *catmore;
310 /* Now that child() does a setuid(getuid()) and a chdir(),
311 we may not be able to open file fnam anymore, so make
315 if(!silent) printf("Cannot open %s as stdin.\n", fnam);
317 execl(catmore, "page", (char *) 0);
318 if(!silent) printf("Cannot exec %s.\n", catmore);
324 #else /* DEF_PAGER */
326 FILE *f; /* free after Robert Viduya */
328 if ((f = fopen (fnam, "r")) == (FILE *) 0) {
330 home(); perror (fnam); flags.toplin = 1;
331 pline ("Cannot open %s.", fnam);
337 #endif /* DEF_PAGER */
347 if(str = getenv("SHELL"))
348 execl(str, str, (char *) 0);
350 execl("/bin/sh", "sh", (char *) 0);
351 pline("sh: cannot execute.");
359 union wait { /* used only for the cast (union wait *) 0 */
362 unsigned short w_Termsig:7;
363 unsigned short w_Coredump:1;
364 unsigned short w_Retcode:8;
371 #include <sys/wait.h>
375 #endif /* NOWAITINCLUDE */
382 if(f == 0){ /* child */
383 settty((char *) 0); /* also calls end_screen() */
387 (void) chdir(getenv("HOME"));
391 if(f == -1) { /* cannot fork */
392 pline("Fork failed. Try again.");
395 /* fork succeeded; wait for child to exit */
396 (void) signal(SIGINT,SIG_IGN);
397 (void) signal(SIGQUIT,SIG_IGN);
398 (void) wait(&status);
401 (void) signal(SIGINT,done1);
403 if(wizard) (void) signal(SIGQUIT,SIG_DFL);