1 /*
2 * Copyright 1997-2004 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 // FILEBUFF.HPP - Definitions for parser file buffering routines
26 #include <iostream>
27
28 using namespace std;
29 // STRUCTURE FOR HANDLING INPUT AND OUTPUT FILES
30 typedef struct {
31 const char *_name;
32 FILE *_fp;
33 } BufferedFile;
34
35 class ArchDesc;
36
37 //------------------------------FileBuff--------------------------------------
38 // This class defines a nicely behaved buffer of text. Entire file of text
39 // is read into buffer at creation, with sentinals at start and end.
40 class FileBuff {
41 friend class FileBuffRegion;
42 private:
43 long _bufferSize; // Size of text holding buffer.
44 long _offset; // Expected filepointer offset.
45 long _bufoff; // Start of buffer file offset
46
47 char *_buf; // The buffer itself.
48 char *_bigbuf; // The buffer plus sentinals; actual heap area
49 char *_bufmax; // A pointer to the buffer end sentinal
50 char *_bufeol; // A pointer to the last complete line end
51
52 int _err; // Error flag for file seek/read operations
53 long _filepos; // Current offset from start of file
54 int _linenum;
55
56 ArchDesc& _AD; // Reference to Architecture Description
57
58 // Error reporting function
59 void file_error(int flag, int linenum, const char *fmt, ...);
60
61 public:
62 const BufferedFile *_fp; // File to be buffered
63
64 FileBuff(BufferedFile *fp, ArchDesc& archDesc); // Constructor
65 ~FileBuff(); // Destructor
66
67 // This returns a pointer to the start of the current line in the buffer,
68 // and increments bufeol and filepos to point at the end of that line.
69 char *get_line(void);
70 int linenum() const { return _linenum; }
71
72 // This converts a pointer into the buffer to a file offset. It only works
73 // when the pointer is valid (i.e. just obtained from getline()).
74 int getoff(const char *s) { return _bufoff+(int)(s-_buf); }
75 };
76
77 //------------------------------FileBuffRegion---------------------------------
78 // A buffer region is really a region of some file, specified as a linked list
79 // of offsets and lengths. These regions can be merged; overlapping regions
80 // will coalesce.
81 class FileBuffRegion {
82 public: // Workaround dev-studio friend/private bug
83 FileBuffRegion *_next; // Linked list of regions sorted by offset.
84 private:
85 FileBuff *_bfr; // The Buffer of the file
86 int _offset, _length; // The file area
87 int _sol; // Start of line where the file area starts
88 int _line; // First line of region
89
90 public:
91 FileBuffRegion(FileBuff*, int sol, int line, int offset, int len);
92 ~FileBuffRegion();
93
94 FileBuffRegion *copy(); // Deep copy
95 FileBuffRegion *merge(FileBuffRegion*); // Merge 2 regions; delete input
96
97 // void print(std::ostream&);
98 // friend std::ostream& operator<< (std::ostream&, FileBuffRegion&);
99 void print(ostream&);
100 friend ostream& operator<< (ostream&, FileBuffRegion&);
101 };