1 /* 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // FILEBUFF.CPP - Routines for handling a parser file buffer 26 #include "adlc.hpp" 27 28 //------------------------------FileBuff--------------------------------------- 29 // Create a new parsing buffer 30 FileBuff::FileBuff( BufferedFile *fptr, ArchDesc& archDesc) : _fp(fptr), _AD(archDesc) { 31 _err = fseek(_fp->_fp, 0, SEEK_END); // Seek to end of file 32 if (_err) { 33 file_error(SEMERR, 0, "File seek error reading input file"); 34 exit(1); // Exit on seek error 35 } 36 _filepos = ftell(_fp->_fp); // Find offset of end of file 37 _bufferSize = _filepos + 5; // Filepos points to last char, so add padding 38 _err = fseek(_fp->_fp, 0, SEEK_SET); // Reset to beginning of file 39 if (_err) { 40 file_error(SEMERR, 0, "File seek error reading input file\n"); 41 exit(1); // Exit on seek error 42 } 43 _filepos = ftell(_fp->_fp); // Reset current file position 44 _linenum = 0; 45 46 _bigbuf = new char[_bufferSize]; // Create buffer to hold text for parser 47 if( !_bigbuf ) { 48 file_error(SEMERR, 0, "Buffer allocation failed\n"); 49 exit(1); // Exit on allocation failure 50 } 51 *_bigbuf = '\n'; // Lead with a sentinel newline 52 _buf = _bigbuf+1; // Skip sentinel 53 _bufmax = _buf; // Buffer is empty 54 _bufeol = _bigbuf; // _bufeol points at sentinel 55 _filepos = -1; // filepos is in sync with _bufeol 56 _bufoff = _offset = 0L; // Offset at file start 57 58 _bufmax += fread(_buf, 1, _bufferSize-2, _fp->_fp); // Fill buffer & set end value 59 if (_bufmax == _buf) { 60 file_error(SEMERR, 0, "File read error, no input read\n"); 61 exit(1); // Exit on read error 62 } 63 *_bufmax = '\n'; // End with a sentinel new-line 64 *(_bufmax+1) = '\0'; // Then end with a sentinel NULL 65 } 66 67 //------------------------------~FileBuff-------------------------------------- 68 // Nuke the FileBuff 69 FileBuff::~FileBuff() { 70 delete[] _bigbuf; 71 } 72 73 //------------------------------get_line---------------------------------------- 74 char *FileBuff::get_line(void) { 75 char *retval; 76 77 // Check for end of file & return NULL 78 if (_bufeol >= _bufmax) return NULL; 79 80 _linenum++; 81 retval = ++_bufeol; // return character following end of previous line 82 if (*retval == '\0') return NULL; // Check for EOF sentinel 83 // Search for newline character which must end each line 84 for(_filepos++; *_bufeol != '\n'; _bufeol++) 85 _filepos++; // keep filepos in sync with _bufeol 86 // _bufeol & filepos point at end of current line, so return pointer to start 87 return retval; 88 } 89 90 //------------------------------file_error------------------------------------- 91 void FileBuff::file_error(int flag, int linenum, const char *fmt, ...) 92 { 93 va_list args; 94 95 va_start(args, fmt); 96 switch (flag) { 97 case 0: _AD._warnings += _AD.emit_msg(0, flag, linenum, fmt, args); 98 case 1: _AD._syntax_errs += _AD.emit_msg(0, flag, linenum, fmt, args); 99 case 2: _AD._semantic_errs += _AD.emit_msg(0, flag, linenum, fmt, args); 100 default: assert(0, ""); break; 101 } 102 va_end(args); 103 _AD._no_output = 1; 104 }