cribbage/instr.c

   1 /*      $NetBSD: instr.c,v 1.4 1996/02/06 22:47:18 jtc 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 1.4 1996/02/06 22:47:18 jtc Exp $";
  41 #endif
  42 #endif /* not lint */
  43
  44 #include <sys/types.h>
  45 #include <sys/wait.h>
  46 #include <sys/stat.h>
  47
  48 #include <curses.h>
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <string.h>
  52 #include <unistd.h>
  53 #include <errno.h>
  54
  55 #include "deck.h"
  56 #include "cribbage.h"
  57 #include "pathnames.h"
  58
  59 void
  60 instructions()
  61 {
  62         struct stat sb;
  63         union wait pstat;
  64         pid_t pid;
  65         char *pager, *path;
  66
  67         if (stat(_PATH_INSTR, &sb)) {
  68                 (void)fprintf(stderr, "cribbage: %s: %s.\n", _PATH_INSTR,
  69                     strerror(errno));
  70                 exit(1);
  71         }
  72         switch (pid = vfork()) {
  73         case -1:
  74                 (void)fprintf(stderr, "cribbage: %s.\n", strerror(errno));
  75                 exit(1);
  76         case 0:
  77                 if (!(path = getenv("PAGER")))
  78                         path = _PATH_MORE;
  79                 if (pager = rindex(path, '/'))
  80                         ++pager;
  81                 pager = path;
  82                 execlp(path, pager, _PATH_INSTR, (char *)NULL);
  83                 (void)fprintf(stderr, "cribbage: %s.\n", strerror(errno));
  84                 _exit(1);
  85         default:
  86                 do {
  87                         pid = waitpid(pid, (int *)&pstat, 0);
  88                 } while (pid == -1 && errno == EINTR);
  89                 if (pid == -1 || pstat.w_status)
  90                         exit(1);
  91         }
  92 }