Line data    Source code

       1             : // SPDX-License-Identifier: LGPL-2.1-or-later
       2             : /* Copy a null-terminated string to a fixed-size buffer, with length checking.
       3             :  * Copyright (C) 2016 Free Software Foundation, Inc.
       4             :  * This file is part of the GNU C Library.
       5             :  */
       6             : 
       7             : /* adapted for Quagga from glibc patch submission originally from
       8             :  * Florian Weimer <fweimer@redhat.com>, 2016-05-18 */
       9             : 
      10             : #ifdef HAVE_CONFIG_H
      11             : #include "config.h"
      12             : #endif
      13             : 
      14             : #include <string.h>
      15             : 
      16             : #ifndef HAVE_STRLCPY
      17             : #undef strlcpy
      18             : 
      19             : size_t strlcpy(char *__restrict dest,
      20             :                const char *__restrict src, size_t destsize);
      21             : 
      22         560 : size_t strlcpy(char *__restrict dest,
      23             :                const char *__restrict src, size_t destsize)
      24             : {
      25         560 :         size_t src_length = strlen(src);
      26             : 
      27         560 :         if (__builtin_expect(src_length >= destsize, 0)) {
      28           0 :                 if (destsize > 0) {
      29             :                         /*
      30             :                          * Copy the leading portion of the string.  The last
      31             :                          * character is subsequently overwritten with the NUL
      32             :                          * terminator, but the destination destsize is usually
      33             :                          * a multiple of a small power of two, so writing it
      34             :                          * twice should be more efficient than copying an odd
      35             :                          * number of bytes.
      36             :                          */
      37           0 :                         memcpy(dest, src, destsize);
      38           0 :                         dest[destsize - 1] = '\0';
      39             :                 }
      40             :         } else
      41             :                 /* Copy the string and its terminating NUL character.  */
      42         560 :                 memcpy(dest, src, src_length + 1);
      43         560 :         return src_length;
      44             : }
      45             : #endif /* HAVE_STRLCPY */