freebsd-dev/games/trek/utility.c
1998-04-01 06:16:17 +00:00

151 lines
3.5 KiB
C

/*
* Copyright (c) 1980, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char sccsid[] = "@(#)utility.c 8.1 (Berkeley) 5/31/93";
#endif /* not lint */
/*
** ASSORTED UTILITY ROUTINES
*/
/*
** BLOCK MOVE
**
** Moves a block of storage of length `l' bytes from the data
** area pointed to by `a' to the area pointed to by `b'.
** Returns the address of the byte following the `b' field.
** Overflow of `b' is not tested.
*/
char *bmove(a, b, l)
char *a, *b;
int l;
{
register int n;
register char *p, *q;
p = a;
q = b;
n = l;
while (n--)
*q++ = *p++;
return (q);
}
/*
** STRING EQUALITY TEST
** null-terminated strings `a' and `b' are tested for
** absolute equality.
** returns one if equal, zero otherwise.
*/
sequal(a, b)
char *a, *b;
{
register char *p, *q;
p = a;
q = b;
while (*p || *q)
if (*p++ != *q++)
return(0);
return(1);
}
/*
** STRING CONCATENATE
**
** The strings `s1' and `s2' are concatenated and stored into
** `s3'. It is ok for `s1' to equal `s3', but terrible things
** will happen if `s2' equals `s3'. The return value is is a
** pointer to the end of `s3' field.
*/
char *concat(s1, s2, s3)
char *s1, *s2, *s3;
{
register char *p;
register char *q;
p = s3;
q = s1;
while (*q)
*p++ = *q++;
q = s2;
while (*q)
*p++ = *q++;
*p = 0;
return (p);
}
/*
** FIND STRING LENGTH
**
** The length of string `s' (excluding the null byte which
** terminates the string) is returned.
*/
length(s)
char *s;
{
register int l;
register char *p;
l = 0;
p = s;
while (*p++)
l++;
return(l);
}
/*
** SYSTEM ERROR
*/
syserr(p0, p1, p2, p3, p4, p5)
{
extern int errno;
printf("\n\07TREK SYSERR: ");
printf(p0, p1, p2, p3, p4, p5);
printf("\n");
if (errno)
printf("\tsystem error %d\n", errno);
exit(1);
}