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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [packages/] [language/] [c/] [libc/] [string/] [v2_0/] [src/] [strncmp.cxx] - Blame information for rev 174

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//===========================================================================
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//
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//      strncmp.cxx
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//
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//      ANSI standard strncmp() routine
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//
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//===========================================================================
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//####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later version.
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with eCos; if not, write to the Free Software Foundation, Inc.,
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// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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//
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// As a special exception, if other files instantiate templates or use macros
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// or inline functions from this file, or you compile this file and link it
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// with other works to produce a work based on this file, this file does not
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// by itself cause the resulting work to be covered by the GNU General Public
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// License. However the source code for this file must still be made available
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// in accordance with section (3) of the GNU General Public License.
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//
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// This exception does not invalidate any other reasons why a work based on
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// this file might be covered by the GNU General Public License.
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//
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// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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// at http://sources.redhat.com/ecos/ecos-license/
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// -------------------------------------------
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//####ECOSGPLCOPYRIGHTEND####
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//===========================================================================
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//#####DESCRIPTIONBEGIN####
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//
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// Author(s):    jlarmour
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// Contributors: 
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// Date:         2000-04-14
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// Purpose:     
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// Description: 
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// Usage:       
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//
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//####DESCRIPTIONEND####
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//
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//===========================================================================
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// CONFIGURATION
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#include <pkgconf/libc_string.h>   // Configuration header
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// INCLUDES
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#include <cyg/infra/cyg_type.h>    // Common type definitions
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#include <cyg/infra/cyg_trac.h>    // Tracing support
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#include <cyg/infra/cyg_ass.h>     // Assertion support
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#include <string.h>                // Header for this file
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#include <stddef.h>         // Compiler definitions such as size_t, NULL etc.
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#include <cyg/libc/string/stringsupp.hxx> // Useful string function support and
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                                          // prototypes
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// EXPORTED SYMBOLS
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externC int
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strncmp( const char *s1, const char *s2, size_t n ) \
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    CYGBLD_ATTRIB_WEAK_ALIAS(__strncmp);
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// FUNCTIONS
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int
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__strncmp( const char *s1, const char *s2, size_t n )
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{
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    int retval;
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    CYG_REPORT_FUNCNAMETYPE( "__strncmp", "returning %d" );
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    CYG_REPORT_FUNCARG3( "s1=%08x, s2=%08x, n=%d", s1, s2, n );
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    if (n == 0)
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    {
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        CYG_REPORT_RETVAL( 0 );
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        return 0;
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    }
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    CYG_CHECK_DATA_PTR( s1, "s1 is not a valid pointer!" );
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    CYG_CHECK_DATA_PTR( s2, "s2 is not a valid pointer!" );
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#if defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || defined(__OPTIMIZE_SIZE__)
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    while (n-- != 0 && *s1 == *s2)
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    {
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        if (n == 0 || *s1 == '\0' || *s2 == '\0')
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            break;
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        s1++;
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        s2++;
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    }
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    retval = (*(unsigned char *) s1) - (*(unsigned char *) s2);
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    CYG_REPORT_RETVAL( retval );
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    return retval;
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#else
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    const CYG_WORD *aligned_s1;
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    const CYG_WORD *aligned_s2;
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    // If s1 or s2 are unaligned, then compare bytes.
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    if (CYG_LIBC_STR_UNALIGNED2 (s1, s2))
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    {
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        while (n-- != 0 && *s1 == *s2)
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        {
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            // If we've run out of bytes or hit a null, return zero
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            // since we already know *s1 == *s2.
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            if (n == 0 || *s1 == '\0')
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                return 0;
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            s1++;
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            s2++;
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        }
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        retval = (*(unsigned char *) s1) - (*(unsigned char *) s2);
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        CYG_REPORT_RETVAL( retval );
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        return retval;
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    } //if
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    // If s1 and s2 are word-aligned, compare them a word at a time.
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    aligned_s1 = (const CYG_WORD *)s1;
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    aligned_s2 = (const CYG_WORD *)s2;
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    while (n >= sizeof(CYG_WORD) && *aligned_s1 == *aligned_s2)
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    {
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        n -= sizeof (CYG_WORD);
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        // If we've run out of bytes or hit a null, return zero
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        // since we already know *aligned_s1 == *aligned_s2.
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        if (n == 0 || CYG_LIBC_STR_DETECTNULL (*aligned_s1))
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        {
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            CYG_REPORT_RETVAL( 0 );
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            return 0;
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        } // if
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        aligned_s1++;
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        aligned_s2++;
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    } // while
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    // A difference was detected in last few bytes of s1, so search bytewise
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    s1 = (const char *)aligned_s1;
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    s2 = (const char *)aligned_s2;
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    while (n-- > 0 && *s1 == *s2)
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    {
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        // If we've run out of bytes or hit a null, return zero
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        // since we already know *s1 == *s2.
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        if (n == 0 || *s1 == '\0')
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        {
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            CYG_REPORT_RETVAL( 0 );
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            return 0;
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        } // if
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        s1++;
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        s2++;
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    } // while
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    retval = (*(unsigned char *) s1) - (*(unsigned char *) s2);
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    CYG_REPORT_RETVAL( retval );
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    return retval;
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#endif // not defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) ||
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       //     defined(__OPTIMIZE_SIZE__)
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} // __strncmp()
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// EOF strncmp.cxx

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