[unix-history] / sys / kern / subr_xxx.c

/*
 * Copyright (c) 1982, 1986, 1991 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.
 *
 *	from: @(#)subr_xxx.c	7.10 (Berkeley) 4/20/91
 *	$Id$
 */

/*
 * Miscellaneous trivial functions, including many
 * that are often inline-expanded or done in assembler.
 */
#include "param.h"
#include "systm.h"
#include "machine/cpu.h"

/*
 * Unsupported device function (e.g. writing to read-only device).
 */
enodev()
{

	return (ENODEV);
}

/*
 * Unconfigured device function; driver not configured.
 */
enxio()
{

	return (ENXIO);
}

/*
 * Unsupported ioctl function.
 */
enoioctl()
{

	return (ENOTTY);
}

/*
 * Unsupported system function.
 * This is used for an otherwise-reasonable operation
 * that is not supported by the current system binary.
 */
enosys()
{

	return (ENOSYS);
}

/*
 * Return error for operation not supported
 * on a specific object or file type.
 */
eopnotsupp()
{

	return (EOPNOTSUPP);
}

/*
 * Generic null operation, always returns success.
 */
nullop()
{

	return (0);
}

/*
 * Definitions of various trivial functions;
 * usually expanded inline rather than being defined here.
 */
#ifdef NEED_MINMAX
imin(a, b)
	int a, b;
{

	return (a < b ? a : b);
}

imax(a, b)
	int a, b;
{

	return (a > b ? a : b);
}

unsigned int
min(a, b)
	unsigned int a, b;
{

	return (a < b ? a : b);
}

unsigned int
max(a, b)
	unsigned int a, b;
{

	return (a > b ? a : b);
}

long
lmin(a, b)
	long a, b;
{

	return (a < b ? a : b);
}

long
lmax(a, b)
	long a, b;
{

	return (a > b ? a : b);
}

unsigned long
ulmin(a, b)
	unsigned long a, b;
{

	return (a < b ? a : b);
}

unsigned long
ulmax(a, b)
	unsigned long a, b;
{

	return (a > b ? a : b);
}
#endif /* NEED_MINMAX */

#ifdef NEED_FFS
ffs(mask)
	register long mask;
{
	register int bit;

	if (!mask)
		return(0);
	for (bit = 1;; ++bit) {
		if (mask&0x01)
			return(bit);
		mask >>= 1;
	}
}
#endif /* NEED_FFS */

#ifdef NEED_BCMP
bcmp(v1, v2, len)
	void *v1, *v2;
	register unsigned len;
{
	register u_char *s1 = v1, *s2 = v2;

	while (len--)
		if (*s1++ != *s2++)
			return (1);
	return (0);
}
#endif /* NEED_BCMP */

#ifdef NEED_STRLEN
size_t
strlen(s1)
	register const char *s1;
{
	register size_t len;

	for (len = 0; *s1++ != '\0'; len++)
		;
	return (len);
}
#endif /* NEED_STRLEN */
Commit	Line	Data
15637ed4 RG	1	/*
	2	* Copyright (c) 1982, 1986, 1991 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	*
78ed81a3	33	* from: @(#)subr_xxx.c 7.10 (Berkeley) 4/20/91
78ed81a3	34	* $Id$
15637ed4 RG	35	*/
	36
	37	/*
	38	* Miscellaneous trivial functions, including many
	39	* that are often inline-expanded or done in assembler.
	40	*/
	41	#include "param.h"
	42	#include "systm.h"
	43	#include "machine/cpu.h"
	44
	45	/*
	46	* Unsupported device function (e.g. writing to read-only device).
	47	*/
	48	enodev()
	49	{
	50
	51	return (ENODEV);
	52	}
	53
	54	/*
	55	* Unconfigured device function; driver not configured.
	56	*/
	57	enxio()
	58	{
	59
	60	return (ENXIO);
	61	}
	62
	63	/*
	64	* Unsupported ioctl function.
	65	*/
	66	enoioctl()
	67	{
	68
	69	return (ENOTTY);
	70	}
	71
	72	/*
	73	* Unsupported system function.
	74	* This is used for an otherwise-reasonable operation
	75	* that is not supported by the current system binary.
	76	*/
	77	enosys()
	78	{
	79
	80	return (ENOSYS);
	81	}
	82
	83	/*
	84	* Return error for operation not supported
	85	* on a specific object or file type.
	86	*/
	87	eopnotsupp()
	88	{
	89
	90	return (EOPNOTSUPP);
	91	}
	92
	93	/*
	94	* Generic null operation, always returns success.
	95	*/
	96	nullop()
	97	{
	98
99	return (0);
100	}
101
102	/*
103	* Definitions of various trivial functions;
104	* usually expanded inline rather than being defined here.
105	*/
106	#ifdef NEED_MINMAX
107	imin(a, b)
108	int a, b;
109	{
110
111	return (a < b ? a : b);
112	}
113
114	imax(a, b)
115	int a, b;
116	{
117
118	return (a > b ? a : b);
119	}
120
121	unsigned int
122	min(a, b)
123	unsigned int a, b;
124	{
125
126	return (a < b ? a : b);
127	}
128
129	unsigned int
130	max(a, b)
131	unsigned int a, b;
132	{
133
134	return (a > b ? a : b);
135	}
136
137	long
138	lmin(a, b)
139	long a, b;
140	{
141
142	return (a < b ? a : b);
143	}
144
145	long
146	lmax(a, b)
147	long a, b;
148	{
149
150	return (a > b ? a : b);
151	}
152
153	unsigned long
154	ulmin(a, b)
155	unsigned long a, b;
156	{
157
158	return (a < b ? a : b);
159	}
160
161	unsigned long
162	ulmax(a, b)
163	unsigned long a, b;
164	{
165
166	return (a > b ? a : b);
167	}
168	#endif /* NEED_MINMAX */
169
170	#ifdef NEED_FFS
171	ffs(mask)
172	register long mask;
173	{
174	register int bit;
175
176	if (!mask)
177	return(0);
178	for (bit = 1;; ++bit) {
179	if (mask&0x01)
180	return(bit);
181	mask >>= 1;
182	}
183	}
184	#endif /* NEED_FFS */
185
186	#ifdef NEED_BCMP
187	bcmp(v1, v2, len)
188	void v1, v2;
189	register unsigned len;
190	{
191	register u_char s1 = v1, s2 = v2;
192
193	while (len--)
194	if (s1++ != s2++)
195	return (1);
196	return (0);
197	}
198	#endif /* NEED_BCMP */
199
200	#ifdef NEED_STRLEN
201	size_t
202	strlen(s1)
203	register const char *s1;
204	{
205	register size_t len;
206
207	for (len = 0; *s1++ != '\0'; len++)
208	;
209	return (len);
210	}
211	#endif /* NEED_STRLEN */