X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fmemcmp.c;h=98dcb76a44aeef7ad1cac50ec3fe827d1a52e3c7;hb=a655ee23a7d332ff458d3785df802f69acd6ea4f;hp=98f7ed79115c2b1a917175782b0fabebac48797b;hpb=6d8337bfc808cddc275899c03482eceb6aff8547;p=gnulib.git diff --git a/lib/memcmp.c b/lib/memcmp.c index 98f7ed791..98dcb76a4 100644 --- a/lib/memcmp.c +++ b/lib/memcmp.c @@ -1,72 +1,83 @@ -/* Copyright (C) 1991, 1993 Free Software Foundation, Inc. +/* Copyright (C) 1991, 1993, 1995, 1997, 1998 Free Software Foundation, Inc. Contributed by Torbjorn Granlund (tege@sics.se). -NOTE: The canonical source of this file is maintained with the GNU C Library. -Bugs can be reported to bug-glibc@prep.ai.mit.edu. + NOTE: The canonical source of this file is maintained with the GNU C Library. + Bugs can be reported to bug-glibc@prep.ai.mit.edu. -This program is free software; you can redistribute it and/or modify it -under the terms of the GNU General Public License as published by the -Free Software Foundation; either version 2, or (at your option) any -later version. + This program is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by the + Free Software Foundation; either version 2, or (at your option) any + later version. -This program 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 General Public License for more details. + This program 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 General Public License for more details. -You should have received a copy of the GNU General Public License -along with this program; if not, write to the Free Software Foundation, -Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, + USA. */ #ifdef HAVE_CONFIG_H -#include "config.h" +# include "config.h" #endif #undef __ptr_t -#if defined (__cplusplus) || (defined (__STDC__) && __STDC__) -#define __ptr_t void * +#if defined __cplusplus || (defined __STDC__ && __STDC__) +# define __ptr_t void * #else /* Not C++ or ANSI C. */ -#undef const -#define const -#define __ptr_t char * +# undef const +# define const +# define __ptr_t char * #endif /* C++ or ANSI C. */ -#if defined (HAVE_STRING_H) || defined (_LIBC) -#include +#ifndef __P +# if defined __GNUC__ || (defined __STDC__ && __STDC__) +# define __P(args) args +# else +# define __P(args) () +# endif /* GCC. */ +#endif /* Not __P. */ + +#if defined HAVE_STRING_H || defined _LIBC +# include #endif +#undef memcmp + #ifdef _LIBC -#include +# include #else /* Not in the GNU C library. */ -#include +# include /* Type to use for aligned memory operations. This should normally be the biggest type supported by a single load and store. Must be an unsigned type. */ -#define op_t unsigned long int -#define OPSIZ (sizeof(op_t)) +# define op_t unsigned long int +# define OPSIZ (sizeof(op_t)) /* Threshold value for when to enter the unrolled loops. */ -#define OP_T_THRES 16 +# define OP_T_THRES 16 /* Type to use for unaligned operations. */ typedef unsigned char byte; -#ifndef WORDS_BIGENDIAN -#define MERGE(w0, sh_1, w1, sh_2) (((w0) >> (sh_1)) | ((w1) << (sh_2))) -#else -#define MERGE(w0, sh_1, w1, sh_2) (((w0) << (sh_1)) | ((w1) >> (sh_2))) -#endif +# ifndef WORDS_BIGENDIAN +# define MERGE(w0, sh_1, w1, sh_2) (((w0) >> (sh_1)) | ((w1) << (sh_2))) +# else +# define MERGE(w0, sh_1, w1, sh_2) (((w0) << (sh_1)) | ((w1) >> (sh_2))) +# endif #endif /* In the GNU C library. */ #ifdef WORDS_BIGENDIAN -#define CMP_LT_OR_GT(a, b) ((a) > (b) ? 1 : -1) +# define CMP_LT_OR_GT(a, b) ((a) > (b) ? 1 : -1) #else -#define CMP_LT_OR_GT(a, b) memcmp_bytes ((a), (b)) +# define CMP_LT_OR_GT(a, b) memcmp_bytes ((a), (b)) #endif /* BE VERY CAREFUL IF YOU CHANGE THIS CODE! */ @@ -86,12 +97,14 @@ typedef unsigned char byte; /* memcmp_bytes -- Compare A and B bytewise in the byte order of the machine. A and B are known to be different. This is needed only on little-endian machines. */ -#ifdef __GNUC__ + +static int memcmp_bytes __P((op_t, op_t)); + +# ifdef __GNUC__ __inline -#endif +# endif static int -memcmp_bytes (a, b) - op_t a, b; +memcmp_bytes (long unsigned int a, long unsigned int b) { long int srcp1 = (long int) &a; long int srcp2 = (long int) &b; @@ -109,6 +122,8 @@ memcmp_bytes (a, b) } #endif +static int memcmp_common_alignment __P((long, long, size_t)); + /* memcmp_common_alignment -- Compare blocks at SRCP1 and SRCP2 with LEN `op_t' objects (not LEN bytes!). Both SRCP1 and SRCP2 should be aligned for memory operations on `op_t's. */ @@ -116,16 +131,14 @@ memcmp_bytes (a, b) __inline #endif static int -memcmp_common_alignment (srcp1, srcp2, len) - long int srcp1; - long int srcp2; - size_t len; +memcmp_common_alignment (long int srcp1, long int srcp2, size_t len) { op_t a0, a1; op_t b0, b1; switch (len % 4) { + default: /* Avoid warning about uninitialized local variables. */ case 2: a0 = ((op_t *) srcp1)[0]; b0 = ((op_t *) srcp2)[0]; @@ -196,6 +209,8 @@ memcmp_common_alignment (srcp1, srcp2, len) return 0; } +static int memcmp_not_common_alignment __P((long, long, size_t)); + /* memcmp_not_common_alignment -- Compare blocks at SRCP1 and SRCP2 with LEN `op_t' objects (not LEN bytes!). SRCP2 should be aligned for memory operations on `op_t', but SRCP1 *should be unaligned*. */ @@ -203,10 +218,7 @@ memcmp_common_alignment (srcp1, srcp2, len) __inline #endif static int -memcmp_not_common_alignment (srcp1, srcp2, len) - long int srcp1; - long int srcp2; - size_t len; +memcmp_not_common_alignment (long int srcp1, long int srcp2, size_t len) { op_t a0, a1, a2, a3; op_t b0, b1, b2, b3; @@ -225,6 +237,7 @@ memcmp_not_common_alignment (srcp1, srcp2, len) switch (len % 4) { + default: /* Avoid warning about uninitialized local variables. */ case 2: a1 = ((op_t *) srcp1)[0]; a2 = ((op_t *) srcp1)[1]; @@ -305,10 +318,7 @@ memcmp_not_common_alignment (srcp1, srcp2, len) } int -memcmp (s1, s2, len) - const __ptr_t s1; - const __ptr_t s2; - size_t len; +rpl_memcmp (const void *s1, const void *s2, size_t len) { op_t a0; op_t b0; @@ -364,3 +374,8 @@ memcmp (s1, s2, len) return 0; } + +#ifdef weak_alias +# undef bcmp +weak_alias (memcmp, bcmp) +#endif