diff options
Diffstat (limited to 'REORG.TODO/wcsmbs/wcpncpy.c')
-rw-r--r-- | REORG.TODO/wcsmbs/wcpncpy.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/REORG.TODO/wcsmbs/wcpncpy.c b/REORG.TODO/wcsmbs/wcpncpy.c new file mode 100644 index 0000000000..42c17eadd0 --- /dev/null +++ b/REORG.TODO/wcsmbs/wcpncpy.c @@ -0,0 +1,87 @@ +/* Copyright (C) 1996-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <wchar.h> + +#ifdef WCPNCPY +# define __wcpncpy WCPNCPY +#endif + +/* Copy no more than N wide-characters of SRC to DEST, returning the + address of the last character written into DEST. */ +wchar_t * +__wcpncpy (wchar_t *dest, const wchar_t *src, size_t n) +{ + wint_t c; + wchar_t *const s = dest; + + if (n >= 4) + { + size_t n4 = n >> 2; + + for (;;) + { + c = *src++; + *dest++ = c; + if (c == L'\0') + break; + c = *src++; + *dest++ = c; + if (c == L'\0') + break; + c = *src++; + *dest++ = c; + if (c == L'\0') + break; + c = *src++; + *dest++ = c; + if (c == L'\0') + break; + if (--n4 == 0) + goto last_chars; + } + n -= dest - s; + goto zero_fill; + } + + last_chars: + n &= 3; + if (n == 0) + return dest; + + for (;;) + { + c = *src++; + --n; + *dest++ = c; + if (c == L'\0') + break; + if (n == 0) + return dest; + } + + zero_fill: + while (n-- > 0) + dest[n] = L'\0'; + + return dest - 1; +} + +#ifndef WCPNCPY +weak_alias (__wcpncpy, wcpncpy) +#endif |