/* Copyright (C) 1991, 1996, 1997, 2003 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 reg_char c1 = '\0'; unsigned reg_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)