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instr.c revision 1.3 
      1 /*	$NetBSD: instr.c,v 1.3 1995/03/21 15:08:52 cgd Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #ifndef lint
     37 #if 0
     38 static char sccsid[] = "@(#)instr.c	8.1 (Berkeley) 5/31/93";
     39 #else
     40 static char rcsid[] = "$NetBSD: instr.c,v 1.3 1995/03/21 15:08:52 cgd Exp $";
     41 #endif
     42 #endif /* not lint */
     43 
     44 #include <sys/types.h>
     45 #include <sys/wait.h>
     46 #include <sys/errno.h>
     47 #include <sys/stat.h>
     48 
     49 #include <curses.h>
     50 #include <stdio.h>
     51 #include <stdlib.h>
     52 #include <string.h>
     53 #include <unistd.h>
     54 
     55 #include "deck.h"
     56 #include "cribbage.h"
     57 #include "pathnames.h"
     58 
     59 void
     60 instructions()
     61 {
     62 	extern int errno;
     63 	struct stat sb;
     64 	union wait pstat;
     65 	pid_t pid;
     66 	char *pager, *path;
     67 
     68 	if (stat(_PATH_INSTR, &sb)) {
     69 		(void)fprintf(stderr, "cribbage: %s: %s.\n", _PATH_INSTR,
     70 		    strerror(errno));
     71 		exit(1);
     72 	}
     73 	switch (pid = vfork()) {
     74 	case -1:
     75 		(void)fprintf(stderr, "cribbage: %s.\n", strerror(errno));
     76 		exit(1);
     77 	case 0:
     78 		if (!(path = getenv("PAGER")))
     79 			path = _PATH_MORE;
     80 		if (pager = rindex(path, '/'))
     81 			++pager;
     82 		pager = path;
     83 		execlp(path, pager, _PATH_INSTR, (char *)NULL);
     84 		(void)fprintf(stderr, "cribbage: %s.\n", strerror(errno));
     85 		_exit(1);
     86 	default:
     87 		do {
     88 			pid = waitpid(pid, (int *)&pstat, 0);
     89 		} while (pid == -1 && errno == EINTR);
     90 		if (pid == -1 || pstat.w_status)
     91 			exit(1);
     92 	}
     93 }
     94