TLA  Line data    Source code

       1                 : /*-------------------------------------------------------------------------
       2                 :  *
       3                 :  * strlcpy.c
       4                 :  *    strncpy done right
       5                 :  *
       6                 :  * Portions Copyright (c) 1996-2023, 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 CBC     3524703 : strlcpy(char *dst, const char *src, size_t siz)
      46                 : {
      47         3524703 :     char       *d = dst;
      48         3524703 :     const char *s = src;
      49         3524703 :     size_t      n = siz;
      50                 : 
      51                 :     /* Copy as many bytes as will fit */
      52         3524703 :     if (n != 0)
      53                 :     {
      54        27389495 :         while (--n != 0)
      55                 :         {
      56        27311800 :             if ((*d++ = *s++) == '\0')
      57         3447012 :                 break;
      58                 :         }
      59                 :     }
      60                 : 
      61                 :     /* Not enough room in dst, add NUL and traverse rest of src */
      62         3524703 :     if (n == 0)
      63                 :     {
      64           77698 :         if (siz != 0)
      65           77698 :             *d = '\0';          /* NUL-terminate dst */
      66         1828861 :         while (*s++)
      67                 :             ;
      68                 :     }
      69                 : 
      70         3524703 :     return (s - src - 1);       /* count does not include NUL */
      71                 : }