1 #ifdef USE_PRAGMA_IDENT_HDR
2 #pragma ident "@(#)filebuff.hpp 1.27 07/05/05 17:05:01 JVM"
3 #endif
4 /*
5 * Copyright 1997-2004 Sun Microsystems, Inc. All Rights Reserved.
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
7 *
8 * This code is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 only, as
10 * published by the Free Software Foundation.
11 *
12 * This code is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 * version 2 for more details (a copy is included in the LICENSE file that
16 * accompanied this code).
17 *
18 * You should have received a copy of the GNU General Public License version
19 * 2 along with this work; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
21 *
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
24 * have any questions.
25 *
26 */
27
28 // FILEBUFF.HPP - Definitions for parser file buffering routines
29 #include <iostream>
30
31 using namespace std;
32 // STRUCTURE FOR HANDLING INPUT AND OUTPUT FILES
33 typedef struct {
34 const char *_name;
35 FILE *_fp;
36 } BufferedFile;
37
38 class ArchDesc;
39
40 //------------------------------FileBuff--------------------------------------
41 // This class defines a nicely behaved buffer of text. Entire file of text
42 // is read into buffer at creation, with sentinals at start and end.
43 class FileBuff {
44 friend class FileBuffRegion;
45 private:
46 long _bufferSize; // Size of text holding buffer.
47 long _offset; // Expected filepointer offset.
48 long _bufoff; // Start of buffer file offset
49
50 char *_buf; // The buffer itself.
51 char *_bigbuf; // The buffer plus sentinals; actual heap area
52 char *_bufmax; // A pointer to the buffer end sentinal
53 char *_bufeol; // A pointer to the last complete line end
54
55 int _err; // Error flag for file seek/read operations
56 long _filepos; // Current offset from start of file
57
58 ArchDesc& _AD; // Reference to Architecture Description
59
60 // Error reporting function
61 void file_error(int flag, int linenum, const char *fmt, ...);
62
63 public:
64 const BufferedFile *_fp; // File to be buffered
65
66 FileBuff(BufferedFile *fp, ArchDesc& archDesc); // Constructor
67 ~FileBuff(); // Destructor
68
69 // This returns a pointer to the start of the current line in the buffer,
70 // and increments bufeol and filepos to point at the end of that line.
71 char *get_line(void);
72
73 // This converts a pointer into the buffer to a file offset. It only works
74 // when the pointer is valid (i.e. just obtained from getline()).
75 int getoff(const char *s) { return _bufoff+(int)(s-_buf); }
76 };
77
78 //------------------------------FileBuffRegion---------------------------------
79 // A buffer region is really a region of some file, specified as a linked list
80 // of offsets and lengths. These regions can be merged; overlapping regions
81 // will coalesce.
82 class FileBuffRegion {
83 public: // Workaround dev-studio friend/private bug
84 FileBuffRegion *_next; // Linked list of regions sorted by offset.
85 private:
86 FileBuff *_bfr; // The Buffer of the file
87 int _offset, _length; // The file area
88 int _sol; // Start of line where the file area starts
89 int _line; // First line of region
90
91 public:
92 FileBuffRegion(FileBuff*, int sol, int line, int offset, int len);
93 ~FileBuffRegion();
94
95 FileBuffRegion *copy(); // Deep copy
96 FileBuffRegion *merge(FileBuffRegion*); // Merge 2 regions; delete input
97
98 // void print(std::ostream&);
99 // friend std::ostream& operator<< (std::ostream&, FileBuffRegion&);
100 void print(ostream&);
101 friend ostream& operator<< (ostream&, FileBuffRegion&);
102 };