diff options
Diffstat (limited to 'wcsmbs/wcsncpy.c')
-rw-r--r-- | wcsmbs/wcsncpy.c | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/wcsmbs/wcsncpy.c b/wcsmbs/wcsncpy.c new file mode 100644 index 0000000000..740c71ecf8 --- /dev/null +++ b/wcsmbs/wcsncpy.c @@ -0,0 +1,85 @@ +/* Copyright (C) 1995 Free Software Foundation, Inc. +This file is part of the GNU C Library. + +The GNU C Library is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public License as +published by the Free Software Foundation; either version 2 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 +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#include <wcstr.h> + + +/* Copy no more than N wide-characters of SRC to DEST. */ +wchar_t * +wcsncpy (dest, src, n) + wchar_t *dest; + const wchar_t *src; + size_t n; +{ + wchar_t c; + wchar_t * const s = dest; + + --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 = n - (dest - s) - 1; + if (n == 0) + return s; + goto zero_fill; + } + + last_chars: + n &= 3; + if (n == 0) + return s; + + do + { + c = *src++; + *++dest = c; + if (--n == 0) + return s; + } + while (c != L'\0'); + + zero_fill: + do + *++dest = L'\0'; + while (--n > 0); + + return s; +} |