usr/src/common/util/memstr.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  23  */
  24
  25 #if defined(_BOOT)
  26 #include <sys/salib.h>
  27 #else
  28 #include <sys/systm.h>
  29 #endif
  30
  31 /*
  32  * Implementations of functions described in memory(3C).
  33  * These functions match the section 3C manpages.
  34  */
  35 /*
  36  * The SunStudio compiler may generate calls to _memmove, _memset,
  37  * and _memcpy; So we need to make sure that the correct symbols
  38  * exist for these calls.
  39  */
  40 #pragma weak _memmove = memmove
  41 void *
  42 memmove(void *s1, const void *s2, size_t n)
  43 {
  44 #if defined(_BOOT)
  45         bcopy(s2, s1, n);
  46 #else
  47         ovbcopy(s2, s1, n);
  48 #endif
  49         return (s1);
  50 }
  51
  52 #pragma weak _memset = memset
  53 void *
  54 memset(void *s, int c, size_t n)
  55 {
  56         unsigned char *t;
  57
  58         if ((unsigned char)c == '\0')
  59                 bzero(s, n);
  60         else {
  61                 for (t = (unsigned char *)s; n > 0; n--)
  62                         *t++ = (unsigned char)c;
  63         }
  64         return (s);
  65 }
  66
  67 int
  68 memcmp(const void *s1, const void *s2, size_t n)
  69 {
  70         const uchar_t *ps1 = s1;
  71         const uchar_t *ps2 = s2;
  72
  73         if (s1 != s2 && n != 0) {
  74                 do {
  75                         if (*ps1++ != *ps2++)
  76                                 return (ps1[-1] - ps2[-1]);
  77                 } while (--n != 0);
  78         }
  79
  80         return (0);
  81 }
  82
  83 #pragma weak _memcpy = memcpy
  84 void *
  85 memcpy(void *s1, const void *s2, size_t n)
  86 {
  87         bcopy(s2, s1, n);
  88         return (s1);
  89 }
  90
  91 void *
  92 memchr(const void *sptr, int c1, size_t n)
  93 {
  94         if (n != 0) {
  95                 unsigned char c = (unsigned char)c1;
  96                 const unsigned char *sp = sptr;
  97
  98                 do {
  99                         if (*sp++ == c)
 100                                 return ((void *)--sp);
 101                 } while (--n != 0);
 102         }
 103         return (NULL);
 104 }