-/* Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this software; see the file COPYING. If not, write to
- * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
- * Boston, MA 02111-1307 USA
- *
- * As a special exception, the Free Software Foundation gives permission
- * for additional uses of the text contained in its release of GUILE.
- *
- * The exception is that, if you link the GUILE library with other files
- * to produce an executable, this does not by itself cause the
- * resulting executable to be covered by the GNU General Public License.
- * Your use of that executable is in no way restricted on account of
- * linking the GUILE library code into it.
- *
- * This exception does not however invalidate any other reasons why
- * the executable file might be covered by the GNU General Public License.
- *
- * This exception applies only to the code released by the
- * Free Software Foundation under the name GUILE. If you copy
- * code from other Free Software Foundation releases into a copy of
- * GUILE, as the General Public License permits, the exception does
- * not apply to the code that you add in this way. To avoid misleading
- * anyone as to the status of such modified files, you must delete
- * this exception notice from them.
- *
- * If you write modifications of your own for GUILE, it is your choice
- * whether to permit this exception to apply to your modifications.
- * If you do not wish that, delete this exception notice.
- */
-
-/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
- gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
-
-\f
-
-/* regex-posix.c -- POSIX regular expression support.
-
- This code was written against Henry Spencer's famous regex package.
- The principal reference for POSIX behavior was the man page for this
- library, not the 1003.2 document itself. Ergo, other `POSIX'
- libraries which do not agree with the Spencer implementation may
- produce varying behavior. Sigh. */
-
-#include <stdio.h>
-#include <sys/types.h>
-
-#include "_scm.h"
-
-/* Supposedly, this file is never compiled unless we know we have
- POSIX regular expressions. But we still put this in an #ifdef so
- the file is CPP'able (for dependency scanning) even on systems that
- don't have a <regex.h> header. */
-#ifdef HAVE_REGCOMP
-#ifdef HAVE_REGEX_H
-#include <regex.h>
-#else
-#ifdef HAVE_RXPOSIX_H
-#include <rxposix.h> /* GNU Rx library */
-#else
-#ifdef HAVE_RX_RXPOSIX_H
-#include <rx/rxposix.h> /* GNU Rx library on Linux */
-#endif
-#endif
-#endif
-#endif
-
-#include "smob.h"
-#include "symbols.h"
-#include "vectors.h"
-#include "strports.h"
-#include "ports.h"
-#include "feature.h"
-
-#include "scm_validate.h"
-#include "regex-posix.h"
-
-/* This is defined by some regex libraries and omitted by others. */
-#ifndef REG_BASIC
-#define REG_BASIC 0
-#endif
-
-long scm_tc16_regex;
-
-static scm_sizet
-free_regex (SCM obj)
-{
- regfree (SCM_RGX (obj));
- free (SCM_RGX (obj));
- return sizeof(regex_t);
-}
-
-\f
-
-SCM_SYMBOL (scm_regexp_error_key, "regular-expression-syntax");
-
-static char *
-scm_regexp_error_msg (int regerrno, regex_t *rx)
-{
- SCM errmsg;
- int l;
-
- /* FIXME: must we wrap any external calls in SCM_DEFER_INTS...SCM_ALLOW_INTS?
- Or are these only necessary when a SCM object may be left in an
- undetermined state (half-formed)? If the latter then I believe we
- may do without the critical section code. -twp */
-
- /* We could simply make errmsg a char pointer, and allocate space with
- malloc. But since we are about to pass the pointer to scm_error, which
- never returns, we would never have the opportunity to free it. Creating
- it as a SCM object means that the system will GC it at some point. */
-
- errmsg = scm_make_string (SCM_MAKINUM (80), SCM_UNDEFINED);
- SCM_DEFER_INTS;
- l = regerror (regerrno, rx, SCM_CHARS (errmsg), 80);
- if (l > 80)
- {
- errmsg = scm_make_string (SCM_MAKINUM (l), SCM_UNDEFINED);
- regerror (regerrno, rx, SCM_CHARS (errmsg), l);
- }
- SCM_ALLOW_INTS;
- return SCM_CHARS (errmsg);
-}
-
-SCM_DEFINE (scm_regexp_p, "regexp?", 1, 0, 0,
- (SCM x),
- "Return @code{#t} if @var{obj} is a compiled regular expression, or\n"
- "@code{#f} otherwise.")
-#define FUNC_NAME s_scm_regexp_p
-{
- return SCM_BOOL(SCM_RGXP (x));
-}
-#undef FUNC_NAME
-
-SCM_DEFINE (scm_make_regexp, "make-regexp", 1, 0, 1,
- (SCM pat, SCM flags),
- "Compile the regular expression described by @var{str}, and return the\n"
- "compiled regexp structure. If @var{str} does not describe a legal\n"
- "regular expression, @code{make-regexp} throws a\n"
- "@code{regular-expression-syntax} error.\n\n"
- "The @var{flag} arguments change the behavior of the compiled regexp.\n"
- "The following flags may be supplied:\n\n"
- "@table @code\n"
- "@item regexp/icase\n"
- "Consider uppercase and lowercase letters to be the same when matching.\n\n"
- "@item regexp/newline\n"
- "If a newline appears in the target string, then permit the @samp{^} and\n"
- "@samp{$} operators to match immediately after or immediately before the\n"
- "newline, respectively. Also, the @samp{.} and @samp{[^...]} operators\n"
- "will never match a newline character. The intent of this flag is to\n"
- "treat the target string as a buffer containing many lines of text, and\n"
- "the regular expression as a pattern that may match a single one of those\n"
- "lines.\n\n"
- "@item regexp/basic\n"
- "Compile a basic (``obsolete'') regexp instead of the extended\n"
- "(``modern'') regexps that are the default. Basic regexps do not\n"
- "consider @samp{|}, @samp{+} or @samp{?} to be special characters, and\n"
- "require the @samp{@{...@}} and @samp{(...)} metacharacters to be\n"
- "backslash-escaped (@pxref{Backslash Escapes}). There are several other\n"
- "differences between basic and extended regular expressions, but these\n"
- "are the most significant.\n\n"
- "@item regexp/extended\n"
- "Compile an extended regular expression rather than a basic regexp. This\n"
- "is the default behavior; this flag will not usually be needed. If a\n"
- "call to @code{make-regexp} includes both @code{regexp/basic} and\n"
- "@code{regexp/extended} flags, the one which comes last will override\n"
- "the earlier one.\n"
- "@end table\n")
-#define FUNC_NAME s_scm_make_regexp
-{
- SCM flag;
- regex_t *rx;
- int status, cflags;
-
- SCM_VALIDATE_ROSTRING (1,pat);
- SCM_COERCE_SUBSTR (pat);
-
- /* Examine list of regexp flags. If REG_BASIC is supplied, then
- turn off REG_EXTENDED flag (on by default). */
- cflags = REG_EXTENDED;
- flag = flags;
- while (SCM_NNULLP (flag))
- {
- if (SCM_INUM (SCM_CAR (flag)) == REG_BASIC)
- cflags &= ~REG_EXTENDED;
- else
- cflags |= SCM_INUM (SCM_CAR (flag));
- flag = SCM_CDR (flag);
- }
-
- rx = SCM_MUST_MALLOC_TYPE(regex_t);
- status = regcomp (rx, SCM_ROCHARS (pat),
- /* Make sure they're not passing REG_NOSUB;
- regexp-exec assumes we're getting match data. */
- cflags & ~REG_NOSUB);
- if (status != 0)
- {
- scm_error (scm_regexp_error_key,
- FUNC_NAME,
- scm_regexp_error_msg (status, rx),
- SCM_BOOL_F,
- SCM_BOOL_F);
- /* never returns */
- }
- SCM_RETURN_NEWSMOB (scm_tc16_regex, rx);
-}
-#undef FUNC_NAME
-
-SCM_DEFINE (scm_regexp_exec, "regexp-exec", 2, 2, 0,
- (SCM rx, SCM str, SCM start, SCM flags),
- "Match the compiled regular expression @var{regexp} against @code{str}.\n"
- "If the optional integer @var{start} argument is provided, begin matching\n"
- "from that position in the string. Return a match structure describing\n"
- "the results of the match, or @code{#f} if no match could be found.")
-#define FUNC_NAME s_scm_regexp_exec
-{
- int status, nmatches, offset;
- regmatch_t *matches;
- SCM mvec = SCM_BOOL_F;
-
- SCM_VALIDATE_RGXP (1,rx);
- SCM_VALIDATE_ROSTRING (2,str);
- SCM_VALIDATE_INUM_DEF_COPY (3,start,0,offset);
- SCM_ASSERT_RANGE (3,start,offset >= 0 && (unsigned) offset <= SCM_LENGTH (str));
- if (SCM_UNBNDP (flags))
- flags = SCM_INUM0;
- SCM_VALIDATE_INUM (4,flags);
- SCM_COERCE_SUBSTR (str);
-
- /* re_nsub doesn't account for the `subexpression' representing the
- whole regexp, so add 1 to nmatches. */
-
- nmatches = SCM_RGX(rx)->re_nsub + 1;
- SCM_DEFER_INTS;
- matches = SCM_MUST_MALLOC_TYPE_NUM (regmatch_t,nmatches);
- status = regexec (SCM_RGX (rx), SCM_ROCHARS (str) + offset,
- nmatches, matches,
- SCM_INUM (flags));
- if (!status)
- {
- int i;
- /* The match vector must include a cell for the string that was matched,
- so add 1. */
- mvec = scm_make_vector (SCM_MAKINUM (nmatches + 1), SCM_UNSPECIFIED);
- SCM_VELTS(mvec)[0] = str;
- for (i = 0; i < nmatches; ++i)
- if (matches[i].rm_so == -1)
- SCM_VELTS(mvec)[i+1] = scm_cons (SCM_MAKINUM (-1), SCM_MAKINUM (-1));
- else
- SCM_VELTS(mvec)[i+1]
- = scm_cons(SCM_MAKINUM(matches[i].rm_so + offset),
- SCM_MAKINUM(matches[i].rm_eo + offset));
- }
- scm_must_free ((char *) matches);
- SCM_ALLOW_INTS;
-
- if (status != 0 && status != REG_NOMATCH)
- scm_error (scm_regexp_error_key,
- FUNC_NAME,
- scm_regexp_error_msg (status, SCM_RGX (rx)),
- SCM_BOOL_F,
- SCM_BOOL_F);
- return mvec;
-}
-#undef FUNC_NAME
-
-void
-scm_init_regex_posix ()
-{
- scm_tc16_regex = scm_make_smob_type_mfpe ("regexp", sizeof (regex_t),
- NULL, free_regex, NULL, NULL);
-
- /* Compilation flags. */
- scm_sysintern ("regexp/basic", scm_long2num (REG_BASIC));
- scm_sysintern ("regexp/extended", scm_long2num (REG_EXTENDED));
- scm_sysintern ("regexp/icase", scm_long2num (REG_ICASE));
- scm_sysintern ("regexp/newline", scm_long2num (REG_NEWLINE));
-
- /* Execution flags. */
- scm_sysintern ("regexp/notbol", scm_long2num (REG_NOTBOL));
- scm_sysintern ("regexp/noteol", scm_long2num (REG_NOTEOL));
-
-#include "regex-posix.x"
-
- scm_add_feature ("regex");
-}
+/* Copyright (C) 1997, 1998, 1999, 2000, 2001, 2004, 2006, 2007 Free Software Foundation, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+
+\f
+
+/* regex-posix.c -- POSIX regular expression support.
+
+ This code was written against Henry Spencer's famous regex package.
+ The principal reference for POSIX behavior was the man page for this
+ library, not the 1003.2 document itself. Ergo, other `POSIX'
+ libraries which do not agree with the Spencer implementation may
+ produce varying behavior. Sigh. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <sys/types.h>
+
+#include "libguile/_scm.h"
+
+/* Supposedly, this file is never compiled unless we know we have
+ POSIX regular expressions. But we still put this in an #ifdef so
+ the file is CPP'able (for dependency scanning) even on systems that
+ don't have a <regex.h> header. */
+#ifdef HAVE_REGCOMP
+#ifdef HAVE_REGEX_H
+#include <regex.h>
+#else
+#ifdef HAVE_RXPOSIX_H
+#include <rxposix.h> /* GNU Rx library */
+#else
+#ifdef HAVE_RX_RXPOSIX_H
+#include <rx/rxposix.h> /* GNU Rx library on Linux */
+#endif
+#endif
+#endif
+#endif
+
+#include "libguile/async.h"
+#include "libguile/smob.h"
+#include "libguile/symbols.h"
+#include "libguile/vectors.h"
+#include "libguile/strports.h"
+#include "libguile/ports.h"
+#include "libguile/feature.h"
+#include "libguile/strings.h"
+
+#include "libguile/validate.h"
+#include "libguile/regex-posix.h"
+
+/* This is defined by some regex libraries and omitted by others. */
+#ifndef REG_BASIC
+#define REG_BASIC 0
+#endif
+
+scm_t_bits scm_tc16_regex;
+
+static size_t
+regex_free (SCM obj)
+{
+ regfree (SCM_RGX (obj));
+ scm_gc_free (SCM_RGX (obj), sizeof(regex_t), "regex");
+ return 0;
+}
+
+\f
+
+SCM_SYMBOL (scm_regexp_error_key, "regular-expression-syntax");
+
+static SCM
+scm_regexp_error_msg (int regerrno, regex_t *rx)
+{
+ char *errmsg;
+ int l;
+
+ errmsg = scm_malloc (80);
+ l = regerror (regerrno, rx, errmsg, 80);
+ if (l > 80)
+ {
+ free (errmsg);
+ errmsg = scm_malloc (l);
+ regerror (regerrno, rx, errmsg, l);
+ }
+ return scm_take_locale_string (errmsg);
+}
+
+SCM_DEFINE (scm_regexp_p, "regexp?", 1, 0, 0,
+ (SCM obj),
+ "Return @code{#t} if @var{obj} is a compiled regular expression,\n"
+ "or @code{#f} otherwise.")
+#define FUNC_NAME s_scm_regexp_p
+{
+ return scm_from_bool(SCM_RGXP (obj));
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_make_regexp, "make-regexp", 1, 0, 1,
+ (SCM pat, SCM flags),
+ "Compile the regular expression described by @var{pat}, and\n"
+ "return the compiled regexp structure. If @var{pat} does not\n"
+ "describe a legal regular expression, @code{make-regexp} throws\n"
+ "a @code{regular-expression-syntax} error.\n"
+ "\n"
+ "The @var{flags} arguments change the behavior of the compiled\n"
+ "regular expression. The following flags may be supplied:\n"
+ "\n"
+ "@table @code\n"
+ "@item regexp/icase\n"
+ "Consider uppercase and lowercase letters to be the same when\n"
+ "matching.\n"
+ "@item regexp/newline\n"
+ "If a newline appears in the target string, then permit the\n"
+ "@samp{^} and @samp{$} operators to match immediately after or\n"
+ "immediately before the newline, respectively. Also, the\n"
+ "@samp{.} and @samp{[^...]} operators will never match a newline\n"
+ "character. The intent of this flag is to treat the target\n"
+ "string as a buffer containing many lines of text, and the\n"
+ "regular expression as a pattern that may match a single one of\n"
+ "those lines.\n"
+ "@item regexp/basic\n"
+ "Compile a basic (``obsolete'') regexp instead of the extended\n"
+ "(``modern'') regexps that are the default. Basic regexps do\n"
+ "not consider @samp{|}, @samp{+} or @samp{?} to be special\n"
+ "characters, and require the @samp{@{...@}} and @samp{(...)}\n"
+ "metacharacters to be backslash-escaped (@pxref{Backslash\n"
+ "Escapes}). There are several other differences between basic\n"
+ "and extended regular expressions, but these are the most\n"
+ "significant.\n"
+ "@item regexp/extended\n"
+ "Compile an extended regular expression rather than a basic\n"
+ "regexp. This is the default behavior; this flag will not\n"
+ "usually be needed. If a call to @code{make-regexp} includes\n"
+ "both @code{regexp/basic} and @code{regexp/extended} flags, the\n"
+ "one which comes last will override the earlier one.\n"
+ "@end table")
+#define FUNC_NAME s_scm_make_regexp
+{
+ SCM flag;
+ regex_t *rx;
+ int status, cflags;
+ char *c_pat;
+
+ SCM_VALIDATE_STRING (1, pat);
+ SCM_VALIDATE_REST_ARGUMENT (flags);
+
+ /* Examine list of regexp flags. If REG_BASIC is supplied, then
+ turn off REG_EXTENDED flag (on by default). */
+ cflags = REG_EXTENDED;
+ flag = flags;
+ while (!scm_is_null (flag))
+ {
+ if (scm_to_int (SCM_CAR (flag)) == REG_BASIC)
+ cflags &= ~REG_EXTENDED;
+ else
+ cflags |= scm_to_int (SCM_CAR (flag));
+ flag = SCM_CDR (flag);
+ }
+
+ rx = scm_gc_malloc_pointerless (sizeof (regex_t), "regex");
+ c_pat = scm_to_locale_string (pat);
+ status = regcomp (rx, c_pat,
+ /* Make sure they're not passing REG_NOSUB;
+ regexp-exec assumes we're getting match data. */
+ cflags & ~REG_NOSUB);
+ free (c_pat);
+ if (status != 0)
+ {
+ SCM errmsg = scm_regexp_error_msg (status, rx);
+ scm_gc_free (rx, sizeof(regex_t), "regex");
+ scm_error_scm (scm_regexp_error_key,
+ scm_from_locale_string (FUNC_NAME),
+ errmsg,
+ SCM_BOOL_F,
+ scm_list_1 (pat));
+
+ /* never returns */
+ }
+ SCM_RETURN_NEWSMOB (scm_tc16_regex, rx);
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_regexp_exec, "regexp-exec", 2, 2, 0,
+ (SCM rx, SCM str, SCM start, SCM flags),
+ "Match the compiled regular expression @var{rx} against\n"
+ "@code{str}. If the optional integer @var{start} argument is\n"
+ "provided, begin matching from that position in the string.\n"
+ "Return a match structure describing the results of the match,\n"
+ "or @code{#f} if no match could be found.\n"
+ "\n"
+ "The @var{flags} arguments change the matching behavior.\n"
+ "The following flags may be supplied:\n"
+ "\n"
+ "@table @code\n"
+ "@item regexp/notbol\n"
+ "Operator @samp{^} always fails (unless @code{regexp/newline}\n"
+ "is used). Use this when the beginning of the string should\n"
+ "not be considered the beginning of a line.\n"
+ "@item regexp/noteol\n"
+ "Operator @samp{$} always fails (unless @code{regexp/newline}\n"
+ "is used). Use this when the end of the string should not be\n"
+ "considered the end of a line.\n"
+ "@end table")
+#define FUNC_NAME s_scm_regexp_exec
+{
+ /* We used to have an SCM_DEFER_INTS, and then later an
+ SCM_CRITICAL_SECTION_START, around the regexec() call. Can't quite
+ remember what defer ints was for, but a critical section would only be
+ wanted now if we think regexec() is not thread-safe. The posix spec
+
+ http://www.opengroup.org/onlinepubs/009695399/functions/regcomp.html
+
+ reads like regexec is meant to be both thread safe and reentrant
+ (mentioning simultaneous use in threads, and in signal handlers). So
+ for now believe no protection needed. */
+
+ int status, nmatches, offset;
+ regmatch_t *matches;
+ char *c_str;
+ SCM mvec = SCM_BOOL_F;
+ SCM substr;
+
+ SCM_VALIDATE_RGXP (1, rx);
+ SCM_VALIDATE_STRING (2, str);
+
+ if (SCM_UNBNDP (start))
+ {
+ substr = str;
+ offset = 0;
+ }
+ else
+ {
+ substr = scm_substring (str, start, SCM_UNDEFINED);
+ offset = scm_to_int (start);
+ }
+
+ if (SCM_UNBNDP (flags))
+ flags = SCM_INUM0;
+
+ /* re_nsub doesn't account for the `subexpression' representing the
+ whole regexp, so add 1 to nmatches. */
+
+ nmatches = SCM_RGX(rx)->re_nsub + 1;
+ matches = scm_malloc (sizeof (regmatch_t) * nmatches);
+ c_str = scm_to_locale_string (substr);
+ status = regexec (SCM_RGX (rx), c_str, nmatches, matches,
+ scm_to_int (flags));
+ free (c_str);
+
+ if (!status)
+ {
+ int i;
+ /* The match vector must include a cell for the string that was matched,
+ so add 1. */
+ mvec = scm_c_make_vector (nmatches + 1, SCM_UNSPECIFIED);
+ SCM_SIMPLE_VECTOR_SET(mvec,0, str);
+ for (i = 0; i < nmatches; ++i)
+ if (matches[i].rm_so == -1)
+ SCM_SIMPLE_VECTOR_SET(mvec, i+1,
+ scm_cons (scm_from_int (-1), scm_from_int (-1)));
+ else
+ SCM_SIMPLE_VECTOR_SET(mvec, i+1,
+ scm_cons (scm_from_long (matches[i].rm_so + offset),
+ scm_from_long (matches[i].rm_eo + offset)));
+ }
+ free (matches);
+
+ if (status != 0 && status != REG_NOMATCH)
+ scm_error_scm (scm_regexp_error_key,
+ scm_from_locale_string (FUNC_NAME),
+ scm_regexp_error_msg (status, SCM_RGX (rx)),
+ SCM_BOOL_F, SCM_BOOL_F);
+ return mvec;
+}
+#undef FUNC_NAME
+
+void
+scm_init_regex_posix ()
+{
+ scm_tc16_regex = scm_make_smob_type ("regexp", sizeof (regex_t));
+ scm_set_smob_free (scm_tc16_regex, regex_free);
+
+ /* Compilation flags. */
+ scm_c_define ("regexp/basic", scm_from_int (REG_BASIC));
+ scm_c_define ("regexp/extended", scm_from_int (REG_EXTENDED));
+ scm_c_define ("regexp/icase", scm_from_int (REG_ICASE));
+ scm_c_define ("regexp/newline", scm_from_int (REG_NEWLINE));
+
+ /* Execution flags. */
+ scm_c_define ("regexp/notbol", scm_from_int (REG_NOTBOL));
+ scm_c_define ("regexp/noteol", scm_from_int (REG_NOTEOL));
+
+#include "libguile/regex-posix.x"
+
+ scm_add_feature ("regex");
+}
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/