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//=========================================================================== // // strncmp.cxx // // ANSI standard strncmp() 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 strncmp( const char *s1, const char *s2, size_t n ) \ CYGBLD_ATTRIB_WEAK_ALIAS(__strncmp); // FUNCTIONS int __strncmp( const char *s1, const char *s2, size_t n ) { int retval; CYG_REPORT_FUNCNAMETYPE( "__strncmp", "returning %d" ); CYG_REPORT_FUNCARG3( "s1=%08x, s2=%08x, n=%d", s1, s2, n ); if (n == 0) { CYG_REPORT_RETVAL( 0 ); return 0; } 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__) while (n-- != 0 && *s1 == *s2) { if (n == 0 || *s1 == '\0' || *s2 == '\0') break; s1++; s2++; } retval = (*(unsigned char *) s1) - (*(unsigned char *) s2); CYG_REPORT_RETVAL( retval ); return retval; #else const CYG_WORD *aligned_s1; const CYG_WORD *aligned_s2; // If s1 or s2 are unaligned, then compare bytes. if (CYG_LIBC_STR_UNALIGNED2 (s1, s2)) { while (n-- != 0 && *s1 == *s2) { // If we've run out of bytes or hit a null, return zero // since we already know *s1 == *s2. if (n == 0 || *s1 == '\0') return 0; s1++; s2++; } retval = (*(unsigned char *) s1) - (*(unsigned char *) s2); CYG_REPORT_RETVAL( retval ); return retval; } //if // If s1 and s2 are word-aligned, compare them a word at a time. aligned_s1 = (const CYG_WORD *)s1; aligned_s2 = (const CYG_WORD *)s2; while (n >= sizeof(CYG_WORD) && *aligned_s1 == *aligned_s2) { n -= sizeof (CYG_WORD); // If we've run out of bytes or hit a null, return zero // since we already know *aligned_s1 == *aligned_s2. if (n == 0 || CYG_LIBC_STR_DETECTNULL (*aligned_s1)) { CYG_REPORT_RETVAL( 0 ); return 0; } // if aligned_s1++; aligned_s2++; } // while // A difference was detected in last few bytes of s1, so search bytewise s1 = (const char *)aligned_s1; s2 = (const char *)aligned_s2; while (n-- > 0 && *s1 == *s2) { // If we've run out of bytes or hit a null, return zero // since we already know *s1 == *s2. if (n == 0 || *s1 == '\0') { CYG_REPORT_RETVAL( 0 ); return 0; } // if s1++; s2++; } // while retval = (*(unsigned char *) s1) - (*(unsigned char *) s2); CYG_REPORT_RETVAL( retval ); return retval; #endif // not defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || // defined(__OPTIMIZE_SIZE__) } // __strncmp() // EOF strncmp.cxx