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 1.3 2005/04/29 09:22:57 joerg Exp $
  36  */
  37
  38 #include <errno.h>
  39
  40 /*
  41 **  ASSORTED UTILITY ROUTINES
  42 */
  43
  44 /*
  45 **  BLOCK MOVE
  46 **
  47 **      Moves a block of storage of length `l' bytes from the data
  48 **      area pointed to by `a' to the area pointed to by `b'.
  49 **      Returns the address of the byte following the `b' field.
  50 **      Overflow of `b' is not tested.
  51 */
  52
  53 char *bmove(a, b, l)
  54 char    *a, *b;
  55 int     l;
  56 {
  57         int             n;
  58         char            *p, *q;
  59
  60         p = a;
  61         q = b;
  62         n = l;
  63         while (n--)
  64                 *q++ = *p++;
  65         return (q);
  66 }
  67
  68
  69 /*
  70 **  STRING EQUALITY TEST
  71 **      null-terminated strings `a' and `b' are tested for
  72 **      absolute equality.
  73 **      returns one if equal, zero otherwise.
  74 */
  75
  76 sequal(a, b)
  77 char    *a, *b;
  78 {
  79         char            *p, *q;
  80
  81         p = a;
  82         q = b;
  83         while (*p || *q)
  84                 if (*p++ != *q++)
  85                         return(0);
  86         return(1);
  87 }
  88
  89
  90 /*
  91 **  STRING CONCATENATE
  92 **
  93 **      The strings `s1' and `s2' are concatenated and stored into
  94 **      `s3'.  It is ok for `s1' to equal `s3', but terrible things
  95 **      will happen if `s2' equals `s3'.  The return value is is a
  96 **      pointer to the end of `s3' field.
  97 */
  98
  99 char *concat(s1, s2, s3)
 100 char    *s1, *s2, *s3;
 101 {
 102         char            *p;
 103         char            *q;
 104
 105         p = s3;
 106         q = s1;
 107         while (*q)
 108                 *p++ = *q++;
 109         q = s2;
 110         while (*q)
 111                 *p++ = *q++;
 112         *p = 0;
 113         return (p);
 114 }
 115
 116
 117 /*
 118 **  FIND STRING LENGTH
 119 **
 120 **      The length of string `s' (excluding the null byte which
 121 **              terminates the string) is returned.
 122 */
 123
 124 length(s)
 125 char    *s;
 126 {
 127         int     l;
 128         char    *p;
 129
 130         l = 0;
 131         p = s;
 132         while (*p++)
 133                 l++;
 134         return(l);
 135 }
 136
 137
 138 /*
 139 **  SYSTEM ERROR
 140 */
 141
 142 syserr(p0, p1, p2, p3, p4, p5)
 143 {
 144         printf("\n\07TREK SYSERR: ");
 145         printf(p0, p1, p2, p3, p4, p5);
 146         printf("\n");
 147         if (errno)
 148                 printf("\tsystem error %d\n", errno);
 149         exit(1);
 150 }