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//=========================================================================== // // memcmp.cxx // // ANSI standard memcmp() routine // //=========================================================================== //####ECOSGPLCOPYRIGHTBEGIN#### // ------------------------------------------- // This file is part of eCos, the Embedded Configurable Operating System. // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc. // // eCos 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. // // eCos 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 eCos; if not, write to the Free Software Foundation, Inc., // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. // // As a special exception, if other files instantiate templates or use macros // or inline functions from this file, or you compile this file and link it // with other works to produce a work based on this file, this file does not // by itself cause the resulting work to be covered by the GNU General Public // License. However the source code for this file must still be made available // in accordance with section (3) of the GNU General Public License. // // This exception does not invalidate any other reasons why a work based on // this file might be covered by the GNU General Public License. // // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc. // at http://sources.redhat.com/ecos/ecos-license/ // ------------------------------------------- //####ECOSGPLCOPYRIGHTEND#### //=========================================================================== //#####DESCRIPTIONBEGIN#### // // Author(s): jlarmour // Contributors: // Date: 2000-04-14 // Purpose: // Description: // Usage: // //####DESCRIPTIONEND#### // //=========================================================================== // CONFIGURATION #include <pkgconf/libc_string.h> // Configuration header // INCLUDES #include <cyg/infra/cyg_type.h> // Common type definitions #include <cyg/infra/cyg_trac.h> // Tracing support #include <cyg/infra/cyg_ass.h> // Assertion support #include <string.h> // Header for this file #include <stddef.h> // Compiler definitions such as size_t, NULL etc. #include <cyg/libc/string/stringsupp.hxx> // Useful string function support and // prototypes // EXPORTED SYMBOLS externC int memcmp( const void *s1, const void *s2, size_t n ) \ CYGBLD_ATTRIB_WEAK_ALIAS(__memcmp); // FUNCTIONS int __memcmp( const void *s1, const void *s2, size_t n ) { int retval; CYG_REPORT_FUNCNAMETYPE( "__memcmp", "returning %d" ); CYG_REPORT_FUNCARG3( "s1=%08x, s2=%08x, n=%d", s1, s2, n ); if (n) { CYG_CHECK_DATA_PTR( s1, "s1 is not a valid pointer!" ); CYG_CHECK_DATA_PTR( s2, "s2 is not a valid pointer!" ); } #if defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || defined(__OPTIMIZE_SIZE__) const unsigned char *m1 = (const unsigned char *) s1; const unsigned char *m2 = (const unsigned char *) s2; while (n--) { if (*m1 != *m2) { retval = *m1 - *m2; CYG_REPORT_RETVAL( retval ); return retval; } m1++; m2++; } CYG_REPORT_RETVAL( 0 ); return 0; #else const unsigned char *m1 = (const unsigned char *) s1; const unsigned char *m2 = (const unsigned char *) s2; const CYG_WORD *aligned_m1; const CYG_WORD *aligned_m2; // If the size is too small, or either pointer is unaligned, // then we punt to the byte compare loop. Hopefully this will // not turn up in inner loops. if (CYG_LIBC_STR_OPT_TOO_SMALL(n) || CYG_LIBC_STR_UNALIGNED2(m1,m2)) { while (n--) { if (*m1 != *m2) { retval = *m1 - *m2; CYG_REPORT_RETVAL( retval ); return retval; } m1++; m2++; } CYG_REPORT_RETVAL( 0 ); return 0; } // Otherwise, load and compare the blocks of memory one // word at a time. aligned_m1 = (const CYG_WORD *) m1; aligned_m2 = (const CYG_WORD *) m2; while (n > CYG_LIBC_STR_OPT_LITTLEBLOCKSIZE) { if (*aligned_m1 != *aligned_m2) { // This block of characters has a mismatch, somewhere. // xoring them together and then testing for null would // be fastest, but this is clearer code. m1 = (const unsigned char *)aligned_m1; m2 = (const unsigned char *)aligned_m2; while (n--) { if (*m1 != *m2) { retval = *m1 - *m2; CYG_REPORT_RETVAL( retval ); return retval; } m1++; m2++; } // NOT REACHED } aligned_m1++; aligned_m2++; n -= CYG_LIBC_STR_OPT_LITTLEBLOCKSIZE; } // checking the last few characters m1 = (const unsigned char *)aligned_m1; m2 = (const unsigned char *)aligned_m2; while (n--) { if (*m1 != *m2) { retval = *m1 - *m2; CYG_REPORT_RETVAL( retval ); return retval; } m1++; m2++; } CYG_REPORT_RETVAL( 0 ); return 0; #endif // not defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || // defined(__OPTIMIZE_SIZE__) } // __memcmp() // EOF memcmp.cxx
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