Line data    Source code

       1             : /*-------------------------------------------------------------------------
       2             :  *
       3             :  * strlcpy.c
       4             :  *    strncpy done right
       5             :  *
       6             :  * Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
       7             :  *
       8             :  *
       9             :  * IDENTIFICATION
      10             :  *    src/port/strlcpy.c
      11             :  *
      12             :  * This file was taken from OpenBSD and is used on platforms that don't
      13             :  * provide strlcpy().  The OpenBSD copyright terms follow.
      14             :  *-------------------------------------------------------------------------
      15             :  */
      16             : 
      17             : /*  $OpenBSD: strlcpy.c,v 1.11 2006/05/05 15:27:38 millert Exp $    */
      18             : 
      19             : /*
      20             :  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
      21             :  *
      22             :  * Permission to use, copy, modify, and distribute this software for any
      23             :  * purpose with or without fee is hereby granted, provided that the above
      24             :  * copyright notice and this permission notice appear in all copies.
      25             :  *
      26             :  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
      27             :  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
      28             :  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
      29             :  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
      30             :  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
      31             :  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
      32             :  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
      33             :  */
      34             : 
      35             : #include "c.h"
      36             : 
      37             : 
      38             : /*
      39             :  * Copy src to string dst of size siz.  At most siz-1 characters
      40             :  * will be copied.  Always NUL terminates (unless siz == 0).
      41             :  * Returns strlen(src); if retval >= siz, truncation occurred.
      42             :  * Function creation history:  http://www.gratisoft.us/todd/papers/strlcpy.html
      43             :  */
      44             : size_t
      45      207289 : strlcpy(char *dst, const char *src, size_t siz)
      46             : {
      47      207289 :     char       *d = dst;
      48      207289 :     const char *s = src;
      49      207289 :     size_t      n = siz;
      50             : 
      51             :     /* Copy as many bytes as will fit */
      52      207289 :     if (n != 0)
      53             :     {
      54     1422141 :         while (--n != 0)
      55             :         {
      56     1212212 :             if ((*d++ = *s++) == '\0')
      57      204649 :                 break;
      58             :         }
      59             :     }
      60             : 
      61             :     /* Not enough room in dst, add NUL and traverse rest of src */
      62      207289 :     if (n == 0)
      63             :     {
      64        2640 :         if (siz != 0)
      65        2640 :             *d = '\0';          /* NUL-terminate dst */
      66        2640 :         while (*s++)
      67             :             ;
      68             :     }
      69             : 
      70      207289 :     return (s - src - 1);       /* count does not include NUL */
      71             : }