FreeBSD/Linux Kernel Cross Reference
sys/libkern/strlcpy.c

     /*      $OpenBSD: strlcpy.c,v 1.12 2015/01/15 03:54:12 millert Exp $    */
     
     /*
      * Copyright (c) 1998, 2015 Todd C. Miller <Todd.Miller@courtesan.com>
      *
      * Permission to use, copy, modify, and distribute this software for any
      * purpose with or without fee is hereby granted, provided that the above
      * copyright notice and this permission notice appear in all copies.
      *
     * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
     * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
     * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/types.h>
    #include <sys/libkern.h>
    
    /*
     * Copy string src to buffer dst of size dsize.  At most dsize-1
     * chars will be copied.  Always NUL terminates (unless dsize == 0).
     * Returns strlen(src); if retval >= dsize, truncation occurred.
     */
    size_t
    strlcpy(char * __restrict dst, const char * __restrict src, size_t dsize)
    {
            const char *osrc = src;
            size_t nleft = dsize;
    
            /* Copy as many bytes as will fit. */
            if (nleft != 0) {
                    while (--nleft != 0) {
                            if ((*dst++ = *src++) == '\0')
                                    break;
                    }
            }
    
            /* Not enough room in dst, add NUL and traverse rest of src. */
            if (nleft == 0) {
                    if (dsize != 0)
                            *dst = '\0';            /* NUL-terminate dst */
                    while (*src++)
                            ;
            }
    
            return(src - osrc - 1); /* count does not include NUL */
    }

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