libc/string/stpncpy.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 Wstpncpy wcpncpy
  12 #else
  13 # define Wstpncpy stpncpy
  14 #endif
  15
  16 Wchar *Wstpncpy(register Wchar * __restrict s1,
  17                                 register const Wchar * __restrict s2,
  18                                 size_t n)
  19 {
  20         Wchar *s = s1;
  21         const Wchar *p = s2;
  22
  23         while (n) {
  24                 if ((*s = *s2) != 0) s2++; /* Need to fill tail with 0s. */
  25                 ++s;
  26                 --n;
  27         }
  28         return s1 + (s2 - p);
  29 }