libc/string/strlcpy.c

   1 /*
   2  * Copyright (C) 2002     Manuel Novoa III
   3  * Copyright (C) 2000-2005 Erik Andersen <andersen@uclibc.org>
   4  *
   5  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
   6  */
   7
   8 #include "_string.h"
   9
  10 #ifdef WANT_WIDE
  11 # define Wstrlcpy __wcslcpy
  12 # define Wstrxfrm wcsxfrm
  13 #else
  14 # define Wstrlcpy strlcpy
  15 # define Wstrxfrm strxfrm
  16 #endif
  17
  18 /* OpenBSD function:
  19  * Copy at most n-1 chars from src to dst and nul-terminate dst.
  20  * Returns strlen(src), so truncation occurred if the return value is >= n. */
  21
  22 size_t Wstrlcpy(register Wchar *__restrict dst,
  23                                   register const Wchar *__restrict src,
  24                                   size_t n)
  25 {
  26         const Wchar *src0 = src;
  27         Wchar dummy[1];
  28
  29         if (!n) {
  30                 dst = dummy;
  31         } else {
  32                 --n;
  33         }
  34
  35         while ((*dst = *src) != 0) {
  36                 if (n) {
  37                         --n;
  38                         ++dst;
  39                 }
  40                 ++src;
  41         }
  42
  43         return src - src0;
  44 }
  45 #ifndef WANT_WIDE
  46 libc_hidden_def(strlcpy)
  47 #endif
  48
  49 #ifndef __UCLIBC_HAS_LOCALE__
  50 strong_alias(Wstrlcpy,Wstrxfrm)
  51 #endif