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//=========================================================================== // // streambuf.cxx // // C library stdio stream buffer functions // //=========================================================================== //####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: 2000-04-20 // Purpose: // Description: // Usage: // //####DESCRIPTIONEND#### // //=========================================================================== // CONFIGURATION #include <pkgconf/libc_stdio.h> // Configuration header // Include buffered I/O? #if defined(CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO) // INCLUDES #include <cyg/infra/cyg_type.h> // Common project-wide type definitions #include <cyg/infra/cyg_ass.h> // Assertion support #include <errno.h> // Cyg_ErrNo #include <stdlib.h> // malloc() and free() #include <cyg/libc/stdio/streambuf.hxx> // header for this file, just in case // FUNCTIONS Cyg_ErrNo Cyg_StdioStreamBuffer::set_buffer( cyg_ucount32 size, cyg_uint8 *new_buffer ) { #ifdef CYGSEM_LIBC_STDIO_DYNAMIC_SETVBUF // user-supplied buffer? if (new_buffer != NULL) { CYG_CHECK_DATA_PTR(new_buffer, "new_buffer not valid"); #ifdef CYGSEM_LIBC_STDIO_SETVBUF_MALLOC // first check if we were responsible for the old buffer if (call_free) { free(buffer_bottom); call_free = false; } #endif buffer_bottom = new_buffer; } #ifdef CYGSEM_LIBC_STDIO_SETVBUF_MALLOC else if ( size != buffer_size ) { // as long as its different from // what we've got now cyg_uint8 *malloced_buf; malloced_buf = (cyg_uint8 * )malloc( size ); if (malloced_buf == NULL) return ENOMEM; // should the old buffer be freed? This waits till after we know // whether the malloc succeeded if (call_free) free( buffer_bottom ); buffer_bottom = malloced_buf; call_free=true; } // else if #else // Here we have not been given a new buffer, but have been given // a new buffer size. If possible, we just shrink what we already // have. else if( size > buffer_size ) return EINVAL; #endif #else // ifdef CYGSEM_LIBC_STDIO_DYNAMIC_SETVBUF // In this config we can't use a different buffer, or set a // size greater than now. We can pretend to shrink it though // Note on the next line we compare it with the size of static_buffer // and not the current size, as that's what is the limiting factor if ( (new_buffer != NULL) || (size > sizeof(static_buffer)) ) return EINVAL; #endif // ifdef CYGSEM_LIBC_STDIO_DYNAMIC_SETVBUF buffer_top = current_buffer_position = &buffer_bottom[0]; buffer_size = size; return ENOERR; } // set_buffer() #endif // if defined(CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO) // EOF streambuf.cxx