1 /* 2 * Copyright (c) 1982, 1986, 1991 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)subr_xxx.c 7.12 (Berkeley) 06/20/92 8 */ 9 10 /* 11 * Miscellaneous trivial functions, including many 12 * that are often inline-expanded or done in assembler. 13 */ 14 #include "param.h" 15 #include "systm.h" 16 #include "machine/cpu.h" 17 18 /* 19 * Unsupported device function (e.g. writing to read-only device). 20 */ 21 enodev() 22 { 23 24 return (ENODEV); 25 } 26 27 /* 28 * Unconfigured device function; driver not configured. 29 */ 30 enxio() 31 { 32 33 return (ENXIO); 34 } 35 36 /* 37 * Unsupported ioctl function. 38 */ 39 enoioctl() 40 { 41 42 return (ENOTTY); 43 } 44 45 /* 46 * Unsupported system function. 47 * This is used for an otherwise-reasonable operation 48 * that is not supported by the current system binary. 49 */ 50 enosys() 51 { 52 53 return (ENOSYS); 54 } 55 56 /* 57 * Return error for operation not supported 58 * on a specific object or file type. 59 */ 60 eopnotsupp() 61 { 62 63 return (EOPNOTSUPP); 64 } 65 66 /* 67 * Generic null operation, always returns success. 68 */ 69 nullop() 70 { 71 72 return (0); 73 } 74 75 /* 76 * Definitions of various trivial functions; 77 * usually expanded inline rather than being defined here. 78 */ 79 #ifdef NEED_MINMAX 80 imin(a, b) 81 int a, b; 82 { 83 84 return (a < b ? a : b); 85 } 86 87 imax(a, b) 88 int a, b; 89 { 90 91 return (a > b ? a : b); 92 } 93 94 unsigned int 95 min(a, b) 96 unsigned int a, b; 97 { 98 99 return (a < b ? a : b); 100 } 101 102 unsigned int 103 max(a, b) 104 unsigned int a, b; 105 { 106 107 return (a > b ? a : b); 108 } 109 110 long 111 lmin(a, b) 112 long a, b; 113 { 114 115 return (a < b ? a : b); 116 } 117 118 long 119 lmax(a, b) 120 long a, b; 121 { 122 123 return (a > b ? a : b); 124 } 125 126 unsigned long 127 ulmin(a, b) 128 unsigned long a, b; 129 { 130 131 return (a < b ? a : b); 132 } 133 134 unsigned long 135 ulmax(a, b) 136 unsigned long a, b; 137 { 138 139 return (a > b ? a : b); 140 } 141 #endif /* NEED_MINMAX */ 142 143 #ifdef NEED_FFS 144 ffs(mask) 145 register long mask; 146 { 147 register int bit; 148 149 if (!mask) 150 return(0); 151 for (bit = 1;; ++bit) { 152 if (mask&0x01) 153 return(bit); 154 mask >>= 1; 155 } 156 } 157 #endif /* NEED_FFS */ 158 159 #ifdef NEED_BCMP 160 bcmp(v1, v2, len) 161 void *v1, *v2; 162 register unsigned len; 163 { 164 register u_char *s1 = v1, *s2 = v2; 165 166 while (len--) 167 if (*s1++ != *s2++) 168 return (1); 169 return (0); 170 } 171 #endif /* NEED_BCMP */ 172 173 #ifdef NEED_STRLEN 174 size_t 175 strlen(s1) 176 register const char *s1; 177 { 178 register int len; 179 180 for (len = 0; *s1++ != '\0'; len++) 181 continue; 182 return (len); 183 } 184 #endif /* NEED_STRLEN */ 185