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b688fc87 WJ |
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 | * | |
33 | * @(#)subr_xxx.c 7.10 (Berkeley) 4/20/91 | |
34 | */ | |
35 | ||
36 | /* | |
37 | * Miscellaneous trivial functions, including many | |
38 | * that are often inline-expanded or done in assembler. | |
39 | */ | |
40 | #include "param.h" | |
41 | #include "systm.h" | |
42 | #include "machine/cpu.h" | |
43 | ||
44 | /* | |
45 | * Unsupported device function (e.g. writing to read-only device). | |
46 | */ | |
47 | enodev() | |
48 | { | |
49 | ||
50 | return (ENODEV); | |
51 | } | |
52 | ||
53 | /* | |
54 | * Unconfigured device function; driver not configured. | |
55 | */ | |
56 | enxio() | |
57 | { | |
58 | ||
59 | return (ENXIO); | |
60 | } | |
61 | ||
62 | /* | |
63 | * Unsupported ioctl function. | |
64 | */ | |
65 | enoioctl() | |
66 | { | |
67 | ||
68 | return (ENOTTY); | |
69 | } | |
70 | ||
71 | /* | |
72 | * Unsupported system function. | |
73 | * This is used for an otherwise-reasonable operation | |
74 | * that is not supported by the current system binary. | |
75 | */ | |
76 | enosys() | |
77 | { | |
78 | ||
79 | return (ENOSYS); | |
80 | } | |
81 | ||
82 | /* | |
83 | * Return error for operation not supported | |
84 | * on a specific object or file type. | |
85 | */ | |
86 | eopnotsupp() | |
87 | { | |
88 | ||
89 | return (EOPNOTSUPP); | |
90 | } | |
91 | ||
92 | /* | |
93 | * Generic null operation, always returns success. | |
94 | */ | |
95 | nullop() | |
96 | { | |
97 | ||
98 | return (0); | |
99 | } | |
100 | ||
101 | /* | |
102 | * Definitions of various trivial functions; | |
103 | * usually expanded inline rather than being defined here. | |
104 | */ | |
105 | #ifdef NEED_MINMAX | |
106 | imin(a, b) | |
107 | int a, b; | |
108 | { | |
109 | ||
110 | return (a < b ? a : b); | |
111 | } | |
112 | ||
113 | imax(a, b) | |
114 | int a, b; | |
115 | { | |
116 | ||
117 | return (a > b ? a : b); | |
118 | } | |
119 | ||
120 | unsigned int | |
121 | min(a, b) | |
122 | unsigned int a, b; | |
123 | { | |
124 | ||
125 | return (a < b ? a : b); | |
126 | } | |
127 | ||
128 | unsigned int | |
129 | max(a, b) | |
130 | unsigned int a, b; | |
131 | { | |
132 | ||
133 | return (a > b ? a : b); | |
134 | } | |
135 | ||
136 | long | |
137 | lmin(a, b) | |
138 | long a, b; | |
139 | { | |
140 | ||
141 | return (a < b ? a : b); | |
142 | } | |
143 | ||
144 | long | |
145 | lmax(a, b) | |
146 | long a, b; | |
147 | { | |
148 | ||
149 | return (a > b ? a : b); | |
150 | } | |
151 | ||
152 | unsigned long | |
153 | ulmin(a, b) | |
154 | unsigned long a, b; | |
155 | { | |
156 | ||
157 | return (a < b ? a : b); | |
158 | } | |
159 | ||
160 | unsigned long | |
161 | ulmax(a, b) | |
162 | unsigned long a, b; | |
163 | { | |
164 | ||
165 | return (a > b ? a : b); | |
166 | } | |
167 | #endif /* NEED_MINMAX */ | |
168 | ||
169 | #ifdef NEED_FFS | |
170 | ffs(mask) | |
171 | register long mask; | |
172 | { | |
173 | register int bit; | |
174 | ||
175 | if (!mask) | |
176 | return(0); | |
177 | for (bit = 1;; ++bit) { | |
178 | if (mask&0x01) | |
179 | return(bit); | |
180 | mask >>= 1; | |
181 | } | |
182 | } | |
183 | #endif /* NEED_FFS */ | |
184 | ||
185 | #ifdef NEED_BCMP | |
186 | bcmp(v1, v2, len) | |
187 | void *v1, *v2; | |
188 | register unsigned len; | |
189 | { | |
190 | register u_char *s1 = v1, *s2 = v2; | |
191 | ||
192 | while (len--) | |
193 | if (*s1++ != *s2++) | |
194 | return (1); | |
195 | return (0); | |
196 | } | |
197 | #endif /* NEED_BCMP */ | |
198 | ||
199 | #ifdef NEED_STRLEN | |
200 | strlen(s1) | |
201 | register char *s1; | |
202 | { | |
203 | register int len; | |
204 | ||
205 | for (len = 0; *s1++ != '\0'; len++) | |
206 | ; | |
207 | return (len); | |
208 | } | |
209 | #endif /* NEED_STRLEN */ |