usr/src/games/trek/utility.c

/*
 * Copyright (c) 1980 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   5.4 (Berkeley) 6/1/90";
#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);
}