trek/utility.c

   1 /*
   2  * Copyright (c) 1980 Regents of the University of California.
   3  * 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
  34 #ifndef lint
  35 /*static char sccsid[] = "from: @(#)utility.c   5.4 (Berkeley) 6/1/90";*/
  36 static char rcsid[] = "$Id: utility.c,v 1.2 1993/08/01 18:49:54 mycroft Exp $";
  37 #endif /* not lint */
  38
  39 /*
  40 **  ASSORTED UTILITY ROUTINES
  41 */
  42
  43 /*
  44 **  BLOCK MOVE
  45 **
  46 **      Moves a block of storage of length `l' bytes from the data
  47 **      area pointed to by `a' to the area pointed to by `b'.
  48 **      Returns the address of the byte following the `b' field.
  49 **      Overflow of `b' is not tested.
  50 */
  51
  52 char *bmove(a, b, l)
  53 char    *a, *b;
  54 int     l;
  55 {
  56         register int            n;
  57         register char           *p, *q;
  58
  59         p = a;
  60         q = b;
  61         n = l;
  62         while (n--)
  63                 *q++ = *p++;
  64         return (q);
  65 }
  66
  67
  68 /*
  69 **  STRING EQUALITY TEST
  70 **      null-terminated strings `a' and `b' are tested for
  71 **      absolute equality.
  72 **      returns one if equal, zero otherwise.
  73 */
  74
  75 sequal(a, b)
  76 char    *a, *b;
  77 {
  78         register char           *p, *q;
  79
  80         p = a;
  81         q = b;
  82         while (*p || *q)
  83                 if (*p++ != *q++)
  84                         return(0);
  85         return(1);
  86 }
  87
  88
  89 /*
  90 **  STRING CONCATENATE
  91 **
  92 **      The strings `s1' and `s2' are concatenated and stored into
  93 **      `s3'.  It is ok for `s1' to equal `s3', but terrible things
  94 **      will happen if `s2' equals `s3'.  The return value is is a
  95 **      pointer to the end of `s3' field.
  96 */
  97
  98 char *concat(s1, s2, s3)
  99 char    *s1, *s2, *s3;
 100 {
 101         register char           *p;
 102         register char           *q;
 103
 104         p = s3;
 105         q = s1;
 106         while (*q)
 107                 *p++ = *q++;
 108         q = s2;
 109         while (*q)
 110                 *p++ = *q++;
 111         *p = 0;
 112         return (p);
 113 }
 114
 115
 116 /*
 117 **  FIND STRING LENGTH
 118 **
 119 **      The length of string `s' (excluding the null byte which
 120 **              terminates the string) is returned.
 121 */
 122
 123 length(s)
 124 char    *s;
 125 {
 126         register int    l;
 127         register char   *p;
 128
 129         l = 0;
 130         p = s;
 131         while (*p++)
 132                 l++;
 133         return(l);
 134 }
 135
 136
 137 /*
 138 **  SYSTEM ERROR
 139 */
 140
 141 syserr(p0, p1, p2, p3, p4, p5)
 142 {
 143         extern int      errno;
 144
 145         printf("\n\07TREK SYSERR: ");
 146         printf(p0, p1, p2, p3, p4, p5);
 147         printf("\n");
 148         if (errno)
 149                 printf("\tsystem error %d\n", errno);
 150         exit(-1);
 151 }