fsi_lex.l revision 1.2.4.2 
1/*	$NetBSD: fsi_lex.l,v 1.2.4.2 2008/10/19 22:39:40 haad Exp $	*/
2
3%{
4/*
5 * Copyright (c) 1997-2007 Erez Zadok
6 * Copyright (c) 1989 Jan-Simon Pendry
7 * Copyright (c) 1989 Imperial College of Science, Technology & Medicine
8 * Copyright (c) 1989 The Regents of the University of California.
9 * All rights reserved.
10 *
11 * This code is derived from software contributed to Berkeley by
12 * Jan-Simon Pendry at Imperial College, London.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 * 1. Redistributions of source code must retain the above copyright
18 *    notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 *    notice, this list of conditions and the following disclaimer in the
21 *    documentation and/or other materials provided with the distribution.
22 * 3. All advertising materials mentioning features or use of this software
23 *    must display the following acknowledgment:
24 *      This product includes software developed by the University of
25 *      California, Berkeley and its contributors.
26 * 4. Neither the name of the University nor the names of its contributors
27 *    may be used to endorse or promote products derived from this software
28 *    without specific prior written permission.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 * SUCH DAMAGE.
41 *
42 *
43 * File: am-utils/fsinfo/fsi_lex.l
44 *
45 */
46
47/*
48 * Lexical analyzer for fsinfo.
49 * TODO: Needs rewriting.
50 */
51
52static int ayylineno;
53
54#ifdef FLEX_SCANNER
55# define INIT_STATE {				\
56		switch ((yy_start - 1) / 2) {	\
57		case 0:				\
58			BEGIN F;		\
59			break;			\
60		}				\
61}
62
63#else /* not FLEX_SCANNER */
64
65/*
66 * Using old lex...
67 */
68# define	INIT_STATE {			\
69		switch (yybgin - yysvec - 1) {	\
70		case 0:				\
71			BEGIN F;		\
72			break;			\
73		}				\
74}
75
76#endif /* end FLEX_SCANNER */
77
78#ifdef HAVE_CONFIG_H
79# include <config.h>
80#endif /* HAVE_CONFIG_H */
81/*
82 * Some systems include a definition for the macro ECHO in <sys/ioctl.h>,
83 * and their (bad) version of lex defines it too at the very beginning of
84 * the generated lex.yy.c file (before it can be easily undefined),
85 * resulting in a conflict.  So undefine it here before needed.
86 * Luckily, it does not appear that this macro is actually used in the rest
87 * of the generated lex.yy.c file.
88 */
89#ifdef ECHO
90# undef ECHO
91#endif /* ECHO */
92#include <am_defs.h>
93#include <fsi_data.h>
94#include <fsinfo.h>
95#include <fsi_gram.h>
96/* and once again undefine this, just in case */
97#ifdef ECHO
98# undef ECHO
99#endif /* ECHO */
100
101/*
102 * There are some things that need to be defined only if using GNU flex.
103 * These must not be defined if using standard lex
104 */
105#ifdef FLEX_SCANNER
106# ifndef ECHO
107#  define ECHO (void) fwrite( yytext, yyleng, 1, yyout )
108# endif /* not ECHO */
109#endif /* FLEX_SCANNER */
110
111/*
112 * some systems such as DU-4.x have a different GNU flex in /usr/bin
113 * which automatically generates yywrap macros and symbols.  So I must
114 * distinguish between them and when yywrap is actually needed.
115 */
116#if !defined(yywrap) || defined(yylex)
117int yywrap(void);
118#endif /* not yywrap or yylex */
119
120int yyerror(const char *, ...);
121
122YYSTYPE yylval;
123static char *fsi_filename;
124static char *optr;
125static char ostr[1024];
126static int find_resword(char *);
127static int quoted;
128
129struct r {
130  char *rw;
131  int tok;
132} rr[] = {
133  { "->", tEQ },
134  { "arch", tARCH },
135  { "as", tAS },
136  { "automount", tAUTOMOUNT },
137  { "cluster", tCLUSTER },
138  { "config", tCONFIG },
139  { "direct", tDIRECT },
140  { "dumpset", tDUMPSET },
141  { "exportfs", tEXPORTFS },
142  { "freq", tFREQ },
143  { "from", tFROM },
144  { "fs", tFS },
145  { "fstype", tFSTYPE },
146  { "host", tHOST },
147  { "hwaddr", tHWADDR },
148  { "inaddr", tINADDR },
149  { "localhost", tLOCALHOST },
150  { "log", tLOG },
151  { "mount", tMOUNT },
152  { "netif", tNETIF },
153  { "netmask", tNETMASK },
154  { "nfsalias", tNFSEQ },
155  { "opts", tOPTS },
156  { "os", tOS },
157  { "passno", tPASSNO },
158  { "sel", tSEL },
159  { "volname", tVOLNAME },
160  { NULL, 0 },
161};
162#define	NRES_WORDS (sizeof(rr)/sizeof(rr[0])-1)
163
164%}
165
166/* This option causes Solaris lex to fail.  Use flex.  See BUGS file */
167/* no need to use yyunput() */
168%option nounput
169
170/* allocate more output slots so lex scanners don't run out of mem */
171%o 1024
172
173%start F Q
174
175%%
176		INIT_STATE;	/* witchcraft */
177
178<F>[^ \t\n"={}]+	{ return find_resword(yytext); } /* dummy " */
179<F>[ \t]		;
180<F>"\n"			{ ayylineno++; }
181<F>[={}]		{ return *yytext; }
182
183<F>\"			{ BEGIN Q; optr = ostr; quoted = 1; }
184<Q>\n			{ ayylineno++; yyerror("\" expected"); BEGIN F; }
185<Q>\\b			{ *optr++ = '\b'; /* escape */ }
186<Q>\\t			{ *optr++ = '\t'; /* escape */ }
187<Q>\\\"			{ *optr++ = '\"'; /* escape */ }
188<Q>\\\\			{ *optr++ = '\\'; /* escape */ }
189<Q>\\\n			{ ayylineno++; /* continue */ }
190<Q>\\r			{ *optr++ = '\r'; /* escape */ }
191<Q>\\n			{ *optr++ = '\n'; /* escape */ }
192<Q>\\f			{ *optr++ = '\f'; /* escape */ }
193<Q>"\\ "		{ *optr++ = ' '; /* force space */ }
194<Q>\\.			{ yyerror("Unknown \\ sequence"); }
195<Q>([ \t]|"\\\n"){2,}	{ char *p = (char *) yytext-1; while ((p = strchr(p+1, '\n'))) ayylineno++; }
196<Q>\"			{ BEGIN F; quoted = 0;
197				*optr = '\0';
198				yylval.s = strdup(ostr);
199				return tSTR;
200			}
201<Q>.			{ *optr++ = *yytext; }
202
203%%
204
205
206static int
207find_resword(char *s)
208{
209  int tok = 0;
210  int l = 0, m = NRES_WORDS/2, h = NRES_WORDS-1;
211  int rc = 0;
212
213  m = NRES_WORDS/2;
214
215#define FSTRCMP(p, q) ((*(p) == *(q)) ? strcmp((p)+1, (q)+1) : *(p) - *(q))
216
217  while ((l <= h) && (rc = FSTRCMP(s, rr[m].rw))) {
218    if (rc < 0)
219      h = m - 1;
220    else
221      l = m + 1;
222    m = (h + l) / 2;
223  }
224
225  if (rc == 0)
226    tok = rr[m].tok;
227
228  switch (tok) {
229  case tLOCALHOST:
230    s = "${host}";
231    /* fall through... */
232  case 0:
233    yylval.s = strdup(s);
234    tok = tSTR;
235    /* fall through... */
236  default:
237    return tok;
238  }
239}
240
241
242int
243yyerror(const char *fmt, ...)
244{
245  va_list ap;
246
247  va_start(ap, fmt);
248  col_cleanup(0);
249  fprintf(stderr, "%s:%d: ", fsi_filename ? fsi_filename : "/dev/stdin", ayylineno);
250  vfprintf(stderr, fmt, ap);
251  fputc('\n', stderr);
252  parse_errors++;
253  va_end(ap);
254  return 0;
255}
256
257
258ioloc *
259current_location(void)
260{
261  ioloc *ip = CALLOC(struct ioloc);
262  ip->i_line = ayylineno;
263  ip->i_file = fsi_filename;
264  return ip;
265}
266
267
268/*
269 * some systems such as DU-4.x have a different GNU flex in /usr/bin
270 * which automatically generates yywrap macros and symbols.  So I must
271 * distinguish between them and when yywrap is actually needed.
272 */
273#if !defined(yywrap) || defined(yylex)
274int yywrap(void)
275{
276  return 1;
277}
278#endif /* not yywrap or yylex */
279