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237 lines
7 KiB
C
237 lines
7 KiB
C
/* Copyright (C) 1997 Free Software Foundation, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* As a special exception, the Free Software Foundation gives permission
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* for additional uses of the text contained in its release of GUILE.
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*
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* The exception is that, if you link the GUILE library with other files
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* to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the GUILE library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the
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* Free Software Foundation under the name GUILE. If you copy
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* code from other Free Software Foundation releases into a copy of
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* GUILE, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for GUILE, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice.
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*/
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/* regex-posix.c -- POSIX regular expression support.
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This code was written against Henry Spencer's famous regex package.
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The principal reference for POSIX behavior was the man page for this
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library, not the 1003.2 document itself. Ergo, other `POSIX'
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libraries which do not agree with the Spencer implementation may
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produce varying behavior. Sigh. */
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#include <stdio.h>
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#include <sys/types.h>
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/* Supposedly, this file is never compiled unless we know we have
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POSIX regular expressions. But we still put this in an #ifdef so
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the file is CPP'able (for dependency scanning) even on systems that
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don't have a <regex.h> header. */
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#ifdef HAVE_REGCOMP
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#include <regex.h>
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#endif
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#include "_scm.h"
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#include "smob.h"
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#include "symbols.h"
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#include "vectors.h"
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#include "strports.h"
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#include "ports.h"
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#include "regex-posix.h"
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long scm_tc16_regex_t;
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static size_t
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scm_free_regex_t (obj)
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SCM obj;
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{
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regfree (SCM_RGX (obj));
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free (SCM_RGX (obj));
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return 0;
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}
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static int
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scm_print_regex_t (obj, port, pstate)
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SCM obj;
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SCM port;
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scm_print_state *pstate;
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{
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regex_t *r;
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r = SCM_RGX (obj);
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scm_gen_puts (scm_regular_string, "#<rgx ", port);
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scm_intprint (obj, 16, port);
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scm_gen_puts (scm_regular_string, ">", port);
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return 1;
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}
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static scm_smobfuns regex_t_smob =
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{ scm_mark0, scm_free_regex_t, scm_print_regex_t, 0 };
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SCM_SYMBOL (scm_regexp_error_key, "regular-expression-syntax");
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char *
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scm_regexp_error_msg (regerrno, rx)
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int regerrno;
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SCM rx;
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{
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SCM errmsg;
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int l;
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/* FIXME: must we wrap any external calls in SCM_DEFER_INTS...SCM_ALLOW_INTS?
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Or are these only necessary when a SCM object may be left in an
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undetermined state (half-formed)? If the latter then I believe we
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may do without the critical section code. -twp */
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/* We could simply make errmsg a char pointer, and allocate space with
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malloc. But since we are about to pass the pointer to scm_error, which
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never returns, we would never have the opportunity to free it. Creating
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it as a SCM object means that the system will GC it at some point. */
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errmsg = scm_make_string (SCM_MAKINUM (80), SCM_UNDEFINED);
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SCM_DEFER_INTS;
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l = regerror (regerrno, SCM_RGX (rx), SCM_CHARS (errmsg), 80);
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if (l > 80)
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{
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errmsg = scm_make_string (SCM_MAKINUM (l), SCM_UNDEFINED);
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regerror (regerrno, SCM_RGX (rx), SCM_CHARS (errmsg), l);
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}
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SCM_ALLOW_INTS;
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return SCM_CHARS (errmsg);
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}
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SCM_PROC (s_regexp_p, "regexp?", 1, 0, 0, scm_regexp_p);
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SCM
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scm_regexp_p (x)
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SCM x;
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{
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return (SCM_NIMP (x) && SCM_RGXP (x) ? SCM_BOOL_T : SCM_BOOL_F);
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}
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/* FIXME: make-regexp should support flags like
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* REG_BASIC and REG_ICASE. Maybe these could be optional symbols
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* in the command args: e.g.:
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* (make-regexp "foo.*bar" 'basic
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* 'ignore-case
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* 'multi-line)
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*/
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SCM_PROC (s_make_regexp, "make-regexp", 1, 0, 0, scm_make_regexp);
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SCM
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scm_make_regexp (pat)
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SCM pat;
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{
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SCM result;
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regex_t *rx;
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int status;
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SCM_ASSERT (SCM_NIMP(pat) && SCM_ROSTRINGP(pat), pat, SCM_ARG1,
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s_make_regexp);
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SCM_COERCE_SUBSTR (pat);
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SCM_DEFER_INTS;
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rx = (regex_t *) scm_must_malloc (sizeof (regex_t), s_make_regexp);
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status = regcomp (rx, SCM_ROCHARS (pat), REG_EXTENDED);
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if (status != 0)
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{
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SCM_ALLOW_INTS;
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scm_error (scm_regexp_error_key,
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s_make_regexp,
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scm_regexp_error_msg (status, rx),
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SCM_BOOL_F,
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SCM_BOOL_F);
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/* never returns */
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}
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SCM_NEWCELL (result);
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SCM_SETCAR (result, scm_tc16_regex_t);
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SCM_SETCDR (result, rx);
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SCM_ALLOW_INTS;
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return result;
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}
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SCM_PROC (s_regexp_exec, "regexp-exec", 2, 1, 0, scm_regexp_exec);
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SCM
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scm_regexp_exec (rx, str, start)
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SCM rx;
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SCM str;
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SCM start;
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{
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int status, nmatches;
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regmatch_t *matches;
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SCM mvec = SCM_BOOL_F;
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SCM_ASSERT (SCM_NIMP (rx) && SCM_RGXP (rx), rx, SCM_ARG1, s_regexp_exec);
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SCM_ASSERT (SCM_NIMP (str) && SCM_ROSTRINGP (str), str, SCM_ARG2,
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s_regexp_exec);
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SCM_COERCE_SUBSTR (str);
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/* re_nsub doesn't account for the `subexpression' representing the
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whole regexp, so add 1 to nmatches. */
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nmatches = SCM_RGX(rx)->re_nsub + 1;
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SCM_DEFER_INTS;
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matches = (regmatch_t *) scm_must_malloc (sizeof (regmatch_t) * nmatches,
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s_regexp_exec);
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status = regexec (SCM_RGX (rx), SCM_ROCHARS (str), nmatches, matches, 0);
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if (!status)
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{
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int i;
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/* The match vector must include a cell for the string that was matched,
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so add 1. */
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mvec = scm_make_vector (SCM_MAKINUM (nmatches + 1), SCM_UNSPECIFIED,
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SCM_UNDEFINED);
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SCM_VELTS(mvec)[0] = str;
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for (i = 0; i < nmatches; ++i)
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SCM_VELTS(mvec)[i+1] = scm_cons (SCM_MAKINUM (matches[i].rm_so),
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SCM_MAKINUM (matches[i].rm_eo));
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}
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SCM_ALLOW_INTS;
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if (status != 0 && status != REG_NOMATCH)
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scm_error (scm_regexp_error_key,
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s_regexp_exec,
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scm_regexp_error_msg (status),
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SCM_BOOL_F,
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SCM_BOOL_F);
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return mvec;
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}
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void
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scm_init_regex_posix ()
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{
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scm_tc16_regex_t = scm_newsmob (®ex_t_smob);
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#include "regex-posix.x"
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}
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