From bec90733b9de6e7d75b8bda19b3f0a7117e6b78d Mon Sep 17 00:00:00 2001 From: Manuel Novoa III Date: Thu, 2 Sep 2004 14:39:38 +0000 Subject: Add a couple of mips-specific string funcs. Port the generic optimized string funcs from glibc, with some tweaks to cut their size a little. The main change is making memmove call memcpy for forward copying to trim redundant code. Make use of both the generic and arch-specific speed-optimized string funcs configurable. Arch-specific take precedence over generic, and generic takes precedence over basic size-optimized uClibc funcs. --- libc/string/generic/strncmp.c | 72 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) create mode 100644 libc/string/generic/strncmp.c (limited to 'libc/string/generic/strncmp.c') diff --git a/libc/string/generic/strncmp.c b/libc/string/generic/strncmp.c new file mode 100644 index 000000000..d9964a883 --- /dev/null +++ b/libc/string/generic/strncmp.c @@ -0,0 +1,72 @@ +/* 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include +#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; +} -- cgit v1.2.3