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//=========================================================================== // // strlen.cxx // // ANSI standard strlen() 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 size_t strlen( const char *s ) CYGBLD_ATTRIB_WEAK_ALIAS(__strlen); // FUNCTIONS size_t __strlen( const char *s ) { int retval; CYG_REPORT_FUNCNAMETYPE( "__strlen", "returning length %d" ); CYG_REPORT_FUNCARG1( "s=%08x", s ); CYG_CHECK_DATA_PTR( s, "s is not a valid pointer!" ); #if defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || defined(__OPTIMIZE_SIZE__) const char *start = s; while (*s) s++; retval = s - start; CYG_REPORT_RETVAL( retval ); return retval; #else const char *start = s; CYG_WORD *aligned_addr; if (CYG_LIBC_STR_UNALIGNED (s)) { while (*s) s++; retval = s - start; CYG_REPORT_RETVAL( retval ); return retval; } // If the string is word-aligned, we can check for the presence of // a null in each word-sized block. aligned_addr = (CYG_WORD *)s; while (!CYG_LIBC_STR_DETECTNULL (*aligned_addr)) aligned_addr++; // Once a null is detected, we check each byte in that block for a // precise position of the null. s = (char*)aligned_addr; while (*s) s++; retval = s - start; CYG_REPORT_RETVAL( retval ); return retval; #endif // not defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || // defined(__OPTIMIZE_SIZE__) } // __strlen() // EOF strlen.cxx