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Diffstat (limited to 'REORG.TODO/string/strncmp.c')
-rw-r--r-- | REORG.TODO/string/strncmp.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/REORG.TODO/string/strncmp.c b/REORG.TODO/string/strncmp.c new file mode 100644 index 0000000000..c41e120091 --- /dev/null +++ b/REORG.TODO/string/strncmp.c @@ -0,0 +1,74 @@ +/* Copyright (C) 1991-2017 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 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 <string.h> +#include <memcopy.h> + +#undef strncmp + +#ifndef STRNCMP +#define STRNCMP strncmp +#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 +STRNCMP (const char *s1, const char *s2, size_t n) +{ + unsigned char c1 = '\0'; + unsigned char c2 = '\0'; + + if (n >= 4) + { + size_t n4 = n >> 2; + do + { + c1 = (unsigned char) *s1++; + c2 = (unsigned char) *s2++; + if (c1 == '\0' || c1 != c2) + return c1 - c2; + c1 = (unsigned char) *s1++; + c2 = (unsigned char) *s2++; + if (c1 == '\0' || c1 != c2) + return c1 - c2; + c1 = (unsigned char) *s1++; + c2 = (unsigned char) *s2++; + if (c1 == '\0' || c1 != c2) + return c1 - c2; + c1 = (unsigned char) *s1++; + c2 = (unsigned char) *s2++; + if (c1 == '\0' || c1 != c2) + return c1 - c2; + } while (--n4 > 0); + n &= 3; + } + + while (n > 0) + { + c1 = (unsigned char) *s1++; + c2 = (unsigned char) *s2++; + if (c1 == '\0' || c1 != c2) + return c1 - c2; + n--; + } + + return c1 - c2; +} + +libc_hidden_builtin_def (STRNCMP) |