Mercurial > trustbridge > nss-cmake-static

annotate nss/lib/dbm/src/memmove.c @ 4:b513267f632f tip

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Build DBM module
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:58:03 +0200
parents 150b72113545
children
rev   line source
3
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1 #if defined(__sun) && !defined(__SVR4)
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2 /*-
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3 * Copyright (c) 1990, 1993
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4 * The Regents of the University of California. All rights reserved.
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5 *
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6 * This code is derived from software contributed to Berkeley by
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7 * Chris Torek.
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8 *
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9 * Redistribution and use in source and binary forms, with or without
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10 * modification, are permitted provided that the following conditions
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11 * are met:
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12 * 1. Redistributions of source code must retain the above copyright
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13 * notice, this list of conditions and the following disclaimer.
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14 * 2. Redistributions in binary form must reproduce the above copyright
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15 * notice, this list of conditions and the following disclaimer in the
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16 * documentation and/or other materials provided with the distribution.
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17 * 3. ***REMOVED*** - see
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18 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
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19 * 4. Neither the name of the University nor the names of its contributors
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20 * may be used to endorse or promote products derived from this software
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21 * without specific prior written permission.
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22 *
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23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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33 * SUCH DAMAGE.
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34 */
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35
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36 #if defined(LIBC_SCCS) && !defined(lint)
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37 static char sccsid[] = "@(#)bcopy.c 8.1 (Berkeley) 6/4/93";
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38 #endif /* LIBC_SCCS and not lint */
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39
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40 #ifdef HAVE_SYS_CDEFS_H
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41 #include <sys/cdefs.h>
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42 #else
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43 #include "cdefs.h"
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44 #endif
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45 #include <string.h>
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46
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47 /*
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48 * sizeof(word) MUST BE A POWER OF TWO
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49 * SO THAT wmask BELOW IS ALL ONES
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50 */
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51 typedef int word; /* "word" used for optimal copy speed */
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52
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53 #define wsize sizeof(word)
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54 #define wmask (wsize - 1)
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55
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56 /*
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57 * Copy a block of memory, handling overlap.
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58 * This is the routine that actually implements
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59 * (the portable versions of) bcopy, memcpy, and memmove.
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60 */
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61 #ifdef MEMCOPY
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62 void *
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63 memcpy(dst0, src0, length)
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64 #else
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65 #ifdef MEMMOVE
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66 void *
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67 memmove(dst0, src0, length)
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68 #else
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69 void
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70 bcopy(src0, dst0, length)
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71 #endif
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72 #endif
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73 void *dst0;
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74 const void *src0;
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75 register size_t length;
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76 {
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77 register char *dst = dst0;
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78 register const char *src = src0;
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79 register size_t t;
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80
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81 if (length == 0 || dst == src) /* nothing to do */
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82 goto done;
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83
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84 /*
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85 * Macros: loop-t-times; and loop-t-times, t>0
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86 */
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87 #define TLOOP(s) if (t) TLOOP1(s)
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88 #define TLOOP1(s) do { s; } while (--t)
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89
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90 if ((unsigned long)dst < (unsigned long)src) {
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91 /*
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92 * Copy forward.
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93 */
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94 t = (int)src; /* only need low bits */
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95 if ((t | (int)dst) & wmask) {
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96 /*
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97 * Try to align operands. This cannot be done
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98 * unless the low bits match.
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99 */
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100 if ((t ^ (int)dst) & wmask || length < wsize)
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101 t = length;
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102 else
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103 t = wsize - (t & wmask);
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104 length -= t;
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105 TLOOP1(*dst++ = *src++);
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106 }
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107 /*
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108 * Copy whole words, then mop up any trailing bytes.
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109 */
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110 t = length / wsize;
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111 TLOOP(*(word *)dst = *(word *)src; src += wsize; dst += wsize);
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112 t = length & wmask;
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113 TLOOP(*dst++ = *src++);
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114 } else {
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115 /*
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116 * Copy backwards. Otherwise essentially the same.
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117 * Alignment works as before, except that it takes
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118 * (t&wmask) bytes to align, not wsize-(t&wmask).
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119 */
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120 src += length;
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121 dst += length;
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122 t = (int)src;
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123 if ((t | (int)dst) & wmask) {
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124 if ((t ^ (int)dst) & wmask || length <= wsize)
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125 t = length;
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126 else
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127 t &= wmask;
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128 length -= t;
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129 TLOOP1(*--dst = *--src);
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130 }
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131 t = length / wsize;
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132 TLOOP(src -= wsize; dst -= wsize; *(word *)dst = *(word *)src);
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133 t = length & wmask;
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134 TLOOP(*--dst = *--src);
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135 }
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136 done:
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137 #if defined(MEMCOPY) || defined(MEMMOVE)
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138 return (dst0);
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139 #else
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140 return;
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141 #endif
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142 }
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143 #endif /* no __sgi */
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144
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145 /* Some compilers don't like an empty source file. */
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146 static int dummy = 0;
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