diff options
Diffstat (limited to 'REORG.TODO/wcsmbs/wcsncmp.c')
-rw-r--r-- | REORG.TODO/wcsmbs/wcsncmp.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/REORG.TODO/wcsmbs/wcsncmp.c b/REORG.TODO/wcsmbs/wcsncmp.c new file mode 100644 index 0000000000..9fe57c7893 --- /dev/null +++ b/REORG.TODO/wcsmbs/wcsncmp.c @@ -0,0 +1,70 @@ +/* Copyright (C) 1995-2017 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> + +#ifndef WCSNCMP +# define WCSNCMP wcsncmp +#endif + +/* Compare no more than N characters of S1 and S2, + returning less than, equal to or greater than zero + if S1 is lexicographically less than, equal to or + greater than S2. */ +int +WCSNCMP (const wchar_t *s1, const wchar_t *s2, size_t n) +{ + wchar_t c1 = L'\0'; + wchar_t c2 = L'\0'; + + if (n >= 4) + { + size_t n4 = n >> 2; + do + { + c1 = *s1++; + c2 = *s2++; + if (c1 == L'\0' || c1 != c2) + return c1 > c2 ? 1 : (c1 < c2 ? -1 : 0); + c1 = *s1++; + c2 = *s2++; + if (c1 == L'\0' || c1 != c2) + return c1 > c2 ? 1 : (c1 < c2 ? -1 : 0); + c1 = *s1++; + c2 = *s2++; + if (c1 == L'\0' || c1 != c2) + return c1 > c2 ? 1 : (c1 < c2 ? -1 : 0); + c1 = *s1++; + c2 = *s2++; + if (c1 == L'\0' || c1 != c2) + return c1 > c2 ? 1 : (c1 < c2 ? -1 : 0); + } while (--n4 > 0); + n &= 3; + } + + while (n > 0) + { + c1 = *s1++; + c2 = *s2++; + if (c1 == L'\0' || c1 != c2) + return c1 > c2 ? 1 : (c1 < c2 ? -1 : 0); + n--; + } + + return 0; +} |