2 ** Splint - annotation-assisted static program checker
3 ** Copyright (C) 1994-2003 University of Virginia,
4 ** Massachusetts Institute of Technology
6 ** This program is free software; you can redistribute it and/or modify it
7 ** under the terms of the GNU General Public License as published by the
8 ** Free Software Foundation; either version 2 of the License, or (at your
9 ** option) any later version.
11 ** This program is distributed in the hope that it will be useful, but
12 ** WITHOUT ANY WARRANTY; without even the implied warranty of
13 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 ** General Public License for more details.
16 ** The GNU General Public License is available from http://www.gnu.org/ or
17 ** the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
18 ** MA 02111-1307, USA.
20 ** For information on splint: info@splint.org
21 ** To report a bug: splint-bug@splint.org
22 ** For more information: http://www.splint.org
27 ** Deliver tokens one at a time
30 ** The input arrives via LSLScanFreshToken ().
31 ** The output is reported via LSLScanNextToken ().
33 ** The tokens are built in module ScanLine.
34 ** The tokens are delivered from this module.
35 ** Meantimes, they are saved in a static array.
37 ** The tokenizing is split off from the delivery of tokens
38 ** to facilitate incremental scanning at a later date.
39 ** The essential is that scanline () can be called or not
40 ** if the input text is dirty or not. Clean lines cause
41 ** tokens to be played out from the saved token list (not
42 ** yet implemented in this version).
45 # include "splintMacros.nf"
47 # include "signature.h"
48 # include "signature2.h"
50 # include "scanline.h"
52 static /*@exposed@*/ ltoken LSLScanLookAhead (void);
53 static inputStream scanFile; /* file to scan */
54 static o_ltoken TokenList[MAXLINE]; /* available tokens */
55 static int nextToken; /* next available token */
56 static int lastToken; /* next available slot */
58 static /*@dependent@*/ /*@null@*/ char *line; /* input text */
59 static unsigned int lineNumber; /* current line number */
61 unsigned int lsllex (YYSTYPE *lval)
63 /* This is important! Bison expects this */
64 lval->ltok = LSLScanNextToken ();
65 return (ltoken_getCode (lval->ltok));
68 ltoken LSLScanNextToken (void)
70 if (nextToken < lastToken)
72 ltoken res = TokenList[nextToken];
73 TokenList[nextToken] = ltoken_undefined;
76 return res; /* Its the only reference now. */
85 line = inputStream_nextLine (scanFile);
87 if (line != (char *) 0)
89 lscanLine (line); /* tokenize */
91 return LSLScanNextToken ();
95 return LSLScanEofToken ();
100 static /*@exposed@*/ ltoken
101 LSLScanLookAhead (void)
103 if (nextToken < lastToken)
105 return TokenList[nextToken];
110 line = inputStream_nextLine (scanFile);
112 if (line != (char *) 0)
116 return LSLScanLookAhead ();
121 ** This is a real memory leak. Its only a few bytes
122 ** per file though, and lsl files are hardly ever used.
126 return LSLScanEofToken ();
133 LSLScanFreshToken (ltoken tok)
135 if (lastToken < MAXLINE)
137 TokenList[lastToken++] = ltoken_copy (tok);
141 llfatalbug (message ("LSLScanFreshToken: out of range: %s",
142 cstring_fromChars (lsymbol_toChars (ltoken_getText (tok)))));
146 /*@exposed@*/ inputStream LSLScanSource (void)
158 LSLScanReset (inputStream s)
162 nextToken = lastToken + 1; /* force call to scanline */
167 LSLScanCleanup (void)