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//=========================================================================== // // mblen.cxx // // ISO standard mblen() 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): jjohnstn // Contributors: jjohnstn // Date: 2000-11-01 // Purpose: Provide ISO C mblen() // Description: // Usage: // //####DESCRIPTIONEND#### // //=========================================================================== // // This code was based on newlib/libc/stdlib/mblen.c // The following is modified from the original newlib description: // /* FUNCTION <<mblen>>---multibyte length function INDEX mblen ANSI_SYNOPSIS #include <stdlib.h> int mblen(const char *<[s]>, size_t <[n]>); TRAD_SYNOPSIS #include <stdlib.h> int mblen(<[s]>, <[n]>) const char *<[s]>; size_t <[n]>; DESCRIPTION When CYGINT_LIBC_I18N_MB_REQUIRED is not defined, this is a minimal ANSI-conforming implementation of <<mblen>>. In this case, the only ``multi-byte character sequences'' recognized are single bytes, and thus <<1>> is returned unless <[s]> is the null pointer or has a length of 0 or is the empty string. When CYGINT_LIBC_I18N_MB_REQUIRED is defined, this routine calls the locale's LC_CTYPE mbtowc_fn to perform the conversion, passing a state variable to allow state dependent decoding. The result is based on the locale setting which may be restricted to a defined set of locales. RETURNS This implementation of <<mblen>> returns <<0>> if <[s]> is <<NULL>> or the empty string; it returns <<1>> if not CYGINT_LIBC_I18N_MB_REQUIRED or the character is a single-byte character; it returns <<-1>> if the multi-byte character is invalid; otherwise it returns the number of bytes in the multibyte character. PORTABILITY <<mblen>> is required in the ANSI C standard. However, the precise effects vary with the locale. <<mblen>> requires no supporting OS subroutines. */ // CONFIGURATION #include <pkgconf/libc_i18n.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 <locale.h> #include <stdlib.h> // Header for this file #include <string.h> // strcmp definition #include <stddef.h> // size_t definition #include "internal.h" // __current_ctype_locale definition #ifdef CYGSEM_LIBC_I18N_PER_THREAD_MB # include <pkgconf/kernel.h> // kernel configuration # include <cyg/kernel/thread.hxx> // per-thread data # include <cyg/kernel/thread.inl> // per-thread data # include <cyg/kernel/mutex.hxx> // mutexes #endif /* CYGSEM_LIBC_I18N_PER_THREAD_MB */ // TRACE #if defined(CYGDBG_USE_TRACING) && defined(CYGNUM_LIBC_I18N_MBLEN_TRACE_LEVEL) static int mblen_trace = CYGNUM_LIBC_I18N_MBLEN_TRACE_LEVEL; # define TL1 (0 < mblen_trace) #else # define TL1 (0) #endif // STATICS #ifdef CYGINT_LIBC_I18N_MB_REQUIRED # ifdef CYGSEM_LIBC_I18N_PER_THREAD_MB static volatile cyg_ucount32 mblen_data_index=CYGNUM_KERNEL_THREADS_DATA_MAX; static Cyg_Mutex mblen_data_mutex CYG_INIT_PRIORITY(LIBC); # else static int cyg_libc_mblen_last; # endif #endif // FUNCTIONS int mblen ( const char *s, size_t n ) { #ifdef CYGINT_LIBC_I18N_MB_REQUIRED int *state; #endif int retval; CYG_REPORT_FUNCNAMETYPE( "mblen", "returning %d" ); CYG_REPORT_FUNCARG2( "s=%08x, n=%ud", s, n ); if (s != NULL) CYG_CHECK_DATA_PTR( s, "s is not a valid pointer!" ); #ifdef CYGINT_LIBC_I18N_MB_REQUIRED #ifdef CYGSEM_LIBC_I18N_PER_THREAD_MB Cyg_Thread *self = Cyg_Thread::self(); // Get a per-thread data slot if we haven't got one already // Do a simple test before locking and retrying test, as this is a // rare situation if (CYGNUM_KERNEL_THREADS_DATA_MAX==mblen_data_index) { mblen_data_mutex.lock(); if (CYGNUM_KERNEL_THREADS_DATA_MAX==mblen_data_index) { // the kernel just throws an assert if this doesn't work // FIXME: Should use real CDL to pre-allocate a slot at compile // time to ensure there are enough slots mblen_data_index = self->new_data_index(); } mblen_data_mutex.unlock(); } // if // we have a valid index now state = (int *)self->get_data_ptr(mblen_data_index); #else /* not CYGSEM_LIBC_I18N_PER_THREAD_MB */ state = &cyg_libc_mblen_last; #endif /* not CYGSEM_LIBC_I18N_PER_THREAD_MB */ CYG_TRACE2( TL1, "Retrieved mblen_last address %08x containing %d", state, *state ); if (__current_ctype_locale->mbtowc_fn) { retval = __current_ctype_locale->mbtowc_fn (NULL, s, n, state); CYG_REPORT_RETVAL( retval ); return retval; } #endif /* CYGINT_LIBC_I18N_MB_REQUIRED */ if (s == NULL || *s == '\0') retval = 0; else if (n == 0) retval = -1; else retval = 1; CYG_REPORT_RETVAL( retval ); return retval; } // mblen() // EOF mblen.cxx