1 /* Copyright (C) 1997 Free Software Foundation, Inc.
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2, or (at your option)
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this software; see the file COPYING. If not, write to
15 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
17 * As a special exception, the Free Software Foundation gives permission
18 * for additional uses of the text contained in its release of GUILE.
20 * The exception is that, if you link the GUILE library with other files
21 * to produce an executable, this does not by itself cause the
22 * resulting executable to be covered by the GNU General Public License.
23 * Your use of that executable is in no way restricted on account of
24 * linking the GUILE library code into it.
26 * This exception does not however invalidate any other reasons why
27 * the executable file might be covered by the GNU General Public License.
29 * This exception applies only to the code released by the
30 * Free Software Foundation under the name GUILE. If you copy
31 * code from other Free Software Foundation releases into a copy of
32 * GUILE, as the General Public License permits, the exception does
33 * not apply to the code that you add in this way. To avoid misleading
34 * anyone as to the status of such modified files, you must delete
35 * this exception notice from them.
37 * If you write modifications of your own for GUILE, it is your choice
38 * whether to permit this exception to apply to your modifications.
39 * If you do not wish that, delete this exception notice.
43 /* regex-posix.c -- POSIX regular expression support.
45 This code was written against Henry Spencer's famous regex package.
46 The principal reference for POSIX behavior was the man page for this
47 library, not the 1003.2 document itself. Ergo, other `POSIX'
48 libraries which do not agree with the Spencer implementation may
49 produce varying behavior. Sigh. */
52 #include <sys/types.h>
56 /* Supposedly, this file is never compiled unless we know we have
57 POSIX regular expressions. But we still put this in an #ifdef so
58 the file is CPP'able (for dependency scanning) even on systems that
59 don't have a <regex.h> header. */
65 #include <rxposix.h> /* GNU Rx library */
67 #ifdef HAVE_RX_RXPOSIX_H
68 #include <rx/rxposix.h> /* GNU Rx library on Linux */
81 #include "regex-posix.h"
83 /* This is defined by some regex libraries and omitted by others. */
88 long scm_tc16_regex_t
;
91 scm_free_regex_t (obj
)
94 regfree (SCM_RGX (obj
));
96 return sizeof(regex_t
);
100 scm_print_regex_t (obj
, port
, pstate
)
103 scm_print_state
*pstate
;
107 scm_puts ("#<rgx ", port
);
108 scm_intprint (obj
, 16, port
);
109 scm_puts (">", port
);
114 static scm_smobfuns regex_t_smob
=
115 { 0, scm_free_regex_t
, scm_print_regex_t
, 0 };
118 SCM_SYMBOL (scm_regexp_error_key
, "regular-expression-syntax");
121 scm_regexp_error_msg (regerrno
, rx
)
128 /* FIXME: must we wrap any external calls in SCM_DEFER_INTS...SCM_ALLOW_INTS?
129 Or are these only necessary when a SCM object may be left in an
130 undetermined state (half-formed)? If the latter then I believe we
131 may do without the critical section code. -twp */
133 /* We could simply make errmsg a char pointer, and allocate space with
134 malloc. But since we are about to pass the pointer to scm_error, which
135 never returns, we would never have the opportunity to free it. Creating
136 it as a SCM object means that the system will GC it at some point. */
138 errmsg
= scm_make_string (SCM_MAKINUM (80), SCM_UNDEFINED
);
140 l
= regerror (regerrno
, SCM_RGX (rx
), SCM_CHARS (errmsg
), 80);
143 errmsg
= scm_make_string (SCM_MAKINUM (l
), SCM_UNDEFINED
);
144 regerror (regerrno
, SCM_RGX (rx
), SCM_CHARS (errmsg
), l
);
147 return SCM_CHARS (errmsg
);
150 SCM_PROC (s_regexp_p
, "regexp?", 1, 0, 0, scm_regexp_p
);
156 return (SCM_NIMP (x
) && SCM_RGXP (x
) ? SCM_BOOL_T
: SCM_BOOL_F
);
159 SCM_PROC (s_make_regexp
, "make-regexp", 1, 0, 1, scm_make_regexp
);
162 scm_make_regexp (SCM pat
, SCM flags
)
168 SCM_ASSERT (SCM_NIMP(pat
) && SCM_ROSTRINGP(pat
), pat
, SCM_ARG1
,
170 SCM_COERCE_SUBSTR (pat
);
172 /* Examine list of regexp flags. If REG_BASIC is supplied, then
173 turn off REG_EXTENDED flag (on by default). */
174 cflags
= REG_EXTENDED
;
176 while (SCM_NNULLP (flag
))
178 if (SCM_INUM (SCM_CAR (flag
)) == REG_BASIC
)
179 cflags
&= ~REG_EXTENDED
;
181 cflags
|= SCM_INUM (SCM_CAR (flag
));
182 flag
= SCM_CDR (flag
);
186 rx
= (regex_t
*) scm_must_malloc (sizeof (regex_t
), s_make_regexp
);
187 status
= regcomp (rx
, SCM_ROCHARS (pat
),
188 /* Make sure they're not passing REG_NOSUB;
189 regexp-exec assumes we're getting match data. */
190 cflags
& ~REG_NOSUB
);
194 scm_error (scm_regexp_error_key
,
196 scm_regexp_error_msg (status
, rx
),
201 SCM_NEWCELL (result
);
202 SCM_SETCAR (result
, scm_tc16_regex_t
);
203 SCM_SETCDR (result
, rx
);
208 SCM_PROC (s_regexp_exec
, "regexp-exec", 2, 2, 0, scm_regexp_exec
);
211 scm_regexp_exec (SCM rx
, SCM str
, SCM start
, SCM flags
)
213 int status
, nmatches
, offset
;
215 SCM mvec
= SCM_BOOL_F
;
217 SCM_ASSERT (SCM_NIMP (rx
) && SCM_RGXP (rx
), rx
, SCM_ARG1
, s_regexp_exec
);
218 SCM_ASSERT (SCM_NIMP (str
) && SCM_ROSTRINGP (str
), str
, SCM_ARG2
,
221 if (SCM_UNBNDP (start
))
225 SCM_ASSERT (SCM_INUMP (start
), start
, SCM_ARG3
, s_regexp_exec
);
226 offset
= SCM_INUM (start
);
227 SCM_ASSERT (offset
>= 0 && offset
<= SCM_LENGTH (str
), start
,
228 SCM_OUTOFRANGE
, s_regexp_exec
);
231 if (SCM_UNBNDP (flags
))
233 SCM_ASSERT (SCM_INUMP (flags
), flags
, SCM_ARG2
, s_regexp_exec
);
235 SCM_COERCE_SUBSTR (str
);
237 /* re_nsub doesn't account for the `subexpression' representing the
238 whole regexp, so add 1 to nmatches. */
240 nmatches
= SCM_RGX(rx
)->re_nsub
+ 1;
242 matches
= (regmatch_t
*) scm_must_malloc (sizeof (regmatch_t
) * nmatches
,
244 status
= regexec (SCM_RGX (rx
), SCM_ROCHARS (str
) + offset
,
250 /* The match vector must include a cell for the string that was matched,
252 mvec
= scm_make_vector (SCM_MAKINUM (nmatches
+ 1), SCM_UNSPECIFIED
);
253 SCM_VELTS(mvec
)[0] = str
;
254 for (i
= 0; i
< nmatches
; ++i
)
255 SCM_VELTS(mvec
)[i
+1] = scm_cons(SCM_MAKINUM(matches
[i
].rm_so
+ offset
),
256 SCM_MAKINUM(matches
[i
].rm_eo
+ offset
));
258 scm_must_free ((char *) matches
);
261 if (status
!= 0 && status
!= REG_NOMATCH
)
262 scm_error (scm_regexp_error_key
,
264 scm_regexp_error_msg (status
),
271 scm_init_regex_posix ()
273 scm_tc16_regex_t
= scm_newsmob (®ex_t_smob
);
275 /* Compilation flags. */
276 scm_sysintern ("regexp/basic", scm_long2num (REG_BASIC
));
277 scm_sysintern ("regexp/extended", scm_long2num (REG_EXTENDED
));
278 scm_sysintern ("regexp/icase", scm_long2num (REG_ICASE
));
279 scm_sysintern ("regexp/newline", scm_long2num (REG_NEWLINE
));
281 /* Execution flags. */
282 scm_sysintern ("regexp/notbol", scm_long2num (REG_NOTBOL
));
283 scm_sysintern ("regexp/noteol", scm_long2num (REG_NOTEOL
));
285 #include "regex-posix.x"
287 scm_add_feature ("regex");