copystr.c

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    1 /*-
    2  * Copyright (c) 2014 Andrew Turner
    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  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: releng/11.2/sys/arm64/arm64/copystr.c 295140 2016-02-02 10:11:56Z andrew $");
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 
   34 int
   35 copystr(const void * __restrict kfaddr, void * __restrict kdaddr, size_t len,
   36     size_t * __restrict lencopied)
   37 {
   38         const char *src;
   39         size_t pos;
   40         char *dst;
   41         int error;
   42 
   43         error = ENAMETOOLONG;
   44         src = kfaddr;
   45         dst = kdaddr;
   46         for (pos = 0; pos < len; pos++) {
   47                 dst[pos] = src[pos];
   48                 if (src[pos] == '\0') {
   49                         /* Increment pos to hold the number of bytes copied */
   50                         pos++;
   51                         error = 0;
   52                         break;
   53                 }
   54         }
   55 
   56         if (lencopied != NULL)
   57                 *lencopied = pos;
   58 
   59         return (error);
   60 }
   61

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FreeBSD/Linux Kernel Cross Reference sys/arm64/arm64/copystr.c

FreeBSD/Linux Kernel Cross Reference
sys/arm64/arm64/copystr.c