/* Copyright (C) 1991, 1996, 1997 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include <string.h> #include <memcopy.h> #undef strncmp /* 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 (s1, s2, n) 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; }