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       1                 :             : /*-------------------------------------------------------------------------
       2                 :             :  *
       3                 :             :  * strlcpy.c
       4                 :             :  *    strncpy done right
       5                 :             :  *
       6                 :             :  * Portions Copyright (c) 1996-2026, 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                 :             : strlcpy(char *dst, const char *src, size_t siz)
      46                 :             : {
      47                 :     5089238 :     char       *d = dst;
      48                 :     5089238 :     const char *s = src;
      49                 :     5089238 :     size_t      n = siz;
      50                 :             : 
      51                 :             :     /* Copy as many bytes as will fit */
      52         [ +  - ]:     5089238 :     if (n != 0)
      53                 :             :     {
      54         [ +  + ]:    43252637 :         while (--n != 0)
      55                 :             :         {
      56         [ +  + ]:    42889462 :             if ((*d++ = *s++) == '\0')
      57                 :     4726075 :                 break;
      58                 :             :         }
      59                 :             :     }
      60                 :             : 
      61                 :             :     /* Not enough room in dst, add NUL and traverse rest of src */
      62         [ +  + ]:     5089238 :     if (n == 0)
      63                 :             :     {
      64         [ +  - ]:      363203 :         if (siz != 0)
      65                 :      363203 :             *d = '\0';          /* NUL-terminate dst */
      66         [ +  + ]:     1969384 :         while (*s++)
      67                 :             :             ;
      68                 :             :     }
      69                 :             : 
      70                 :     5089238 :     return (s - src - 1);       /* count does not include NUL */
      71                 :             : }