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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [packages/] [language/] [c/] [libc/] [string/] [v2_0/] [src/] [strchr.cxx] - Rev 27
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//=========================================================================== // // strchr.cxx // // ANSI standard strchr() 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 char * strchr( const char *s, int c ) CYGBLD_ATTRIB_WEAK_ALIAS(__strchr); // MACROS // DETECTCHAR returns nonzero if X contains the byte used // to fill MASK. #define DETECTCHAR(X,MASK) (CYG_LIBC_STR_DETECTNULL( (X) ^ (MASK) )) // FUNCTIONS char * __strchr( const char *s, int c ) { CYG_REPORT_FUNCNAMETYPE( "__strchr", "returning %08x" ); CYG_REPORT_FUNCARG2( "s=%08x, c=%d", s, c ); CYG_CHECK_DATA_PTR( s, "s is not a valid pointer!" ); #if defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || defined(__OPTIMIZE_SIZE__) char charc = c; while (*s && *s != charc) { s++; } if (*s != charc) { s = NULL; } CYG_REPORT_RETVAL( s ); return (char *) s; #else char charc = c; CYG_WORD mask; CYG_WORD j; CYG_WORD *aligned_addr; if (CYG_LIBC_STR_UNALIGNED (s)) { while (*s && *s != charc) s++; if (*s != charc) s = NULL; CYG_REPORT_RETVAL( s ); return (char *) s; } for (j = 0, mask = 0; j < sizeof(mask); j++) mask = (mask << 8) + charc; aligned_addr = (CYG_WORD *)s; while (!CYG_LIBC_STR_DETECTNULL (*aligned_addr) && !DETECTCHAR (*aligned_addr, mask)) aligned_addr++; // The block of bytes currently pointed to by aligned_addr // contains either a null or the target char, or both. We // catch it using the bytewise search. s = (char *)aligned_addr; while (*s && *s != charc) s++; if (*s != charc) s = NULL; CYG_REPORT_RETVAL( s ); return (char *)s; #endif // not defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || // defined(__OPTIMIZE_SIZE__) } // __strchr() // EOF strchr.cxx
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