games/trek/utility.c

   1 /*
   2  * Copyright (c) 1980, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)utility.c        8.1 (Berkeley) 5/31/93
  34  * $FreeBSD: src/games/trek/utility.c,v 1.5 1999/11/30 03:49:55 billf Exp $
  35  * $DragonFly: src/games/trek/utility.c,v 1.4 2006/09/07 21:19:45 pavalos Exp $
  36  */
  37
  38 #include <errno.h>
  39 #include <stdarg.h>
  40 #include "trek.h"
  41
  42 /*
  43 **  ASSORTED UTILITY ROUTINES
  44 */
  45
  46 /*
  47 **  BLOCK MOVE
  48 **
  49 **      Moves a block of storage of length `l' bytes from the data
  50 **      area pointed to by `a' to the area pointed to by `b'.
  51 **      Returns the address of the byte following the `b' field.
  52 **      Overflow of `b' is not tested.
  53 */
  54
  55 char *
  56 bmove(const void *a, void *b, size_t l)
  57 {
  58         return((char *)memcpy(b, a, l) + l);
  59 }
  60
  61
  62 /*
  63 **  STRING EQUALITY TEST
  64 **      null-terminated strings `a' and `b' are tested for
  65 **      absolute equality.
  66 **      returns one if equal, zero otherwise.
  67 */
  68
  69 bool
  70 sequal(const char *a, const char *b)
  71 {
  72         return(!strcmp(a, b));
  73 }
  74
  75
  76 /*
  77 **  SYSTEM ERROR
  78 */
  79
  80 void
  81 syserr(const char *fmt, ...)
  82 {
  83         va_list ap;
  84
  85         va_start(ap, fmt);
  86         printf("\n\07TREK SYSERR: ");
  87         vprintf(fmt, ap);
  88         printf("\n");
  89         if (errno)
  90                 printf("\tsystem error %d\n", errno);
  91         va_end(ap);
  92         exit(1);
  93 }