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Commit	Line	Data
	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	}