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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [packages/] [language/] [c/] [libc/] [stdio/] [v2_0/] [src/] [input/] [fgets.cxx] - Rev 466
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//======================================================================== // // fgets.cxx // // ISO C standard I/O fgets() function // //======================================================================== //####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: 2001-03-14 // Purpose: Implementation of ISO C standard I/O fgets() function // Description: // Usage: // //####DESCRIPTIONEND#### // //======================================================================= // CONFIGURATION #include <pkgconf/libc_stdio.h> // Configuration header // INCLUDES #include <cyg/infra/cyg_type.h> // Common type definitions #include <cyg/infra/cyg_ass.h> // Assertion support #include <cyg/infra/cyg_trac.h> // Tracing support #include <stddef.h> // NULL and size_t from compiler #include <stdio.h> // header for this file #include <errno.h> // error codes #include <cyg/libc/stdio/stream.hxx>// Cyg_StdioStream // FUNCTIONS // FIXME: should be reworked to read buffer at a time, and scan that // for newlines, rather than reading byte at a time. externC char * fgets( char *s, int n, FILE *stream ) { Cyg_StdioStream *real_stream = (Cyg_StdioStream *)stream; Cyg_ErrNo err=ENOERR; cyg_uint8 c; cyg_uint8 *str=(cyg_uint8 *)s; int nch; CYG_CHECK_DATA_PTRC( s ); CYG_CHECK_DATA_PTRC( stream ); CYG_PRECONDITION( n > 0, "requested 0 or negative chars"); CYG_REPORT_FUNCTYPE( "returning string %08x"); CYG_REPORT_FUNCARG3( "s=%08x, n=%d, stream=%08x", s, n, stream ); for (nch=1; nch < n; nch++) { err = real_stream->read_byte( &c ); // if nothing to read, try again ONCE after refilling buffer if (EAGAIN == err) { err = real_stream->refill_read_buffer(); if ( !err ) err = real_stream->read_byte( &c ); if (EAGAIN == err) { if (1 == nch) { // indicates EOF at start CYG_REPORT_RETVAL( NULL ); return NULL; } else break; // EOF } // if } // if *str++ = c; if ('\n' == c) break; } // while *str = '\0'; // NULL terminate it if (err && EAGAIN != err) { real_stream->set_error( err ); errno = err; CYG_REPORT_RETVAL( NULL ); return NULL; } // if CYG_REPORT_RETVAL( s ); return s; } // fgets() // EOF fgets.cxx
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