Add the BSD-licensed Citrus iconv to the base system with default off

setting. It can be built by setting the WITH_ICONV knob. While this
knob is unset, the library part, the binaries, the header file and
the metadata files will not be built or installed so it makes no impact
on the system if left turned off.

This work is based on the iconv implementation in NetBSD but a great
number of improvements and feature additions have been included:

- Some utilities have been added. There is a conversion table generator,
  which can compare conversion tables to reference data generated by
  GNU libiconv. This helps ensuring conversion compatibility.
- UTF-16 surrogate support and some endianness issues have been fixed.
- The rather chaotic Makefiles to build metadata have been refactored
  and cleaned up, now it is easy to read and it is also easier to add
  support for new encodings.
- A bunch of new encodings and encoding aliases have been added.
- Support for 1->2, 1->3 and 1->4 mappings, which is needed for
  transliterating with flying accents as GNU does, like "u.
- Lots of warnings have been fixed, the major part of the code is
  now WARNS=6 clean.
- New section 1 and section 5 manual pages have been added.
- Some GNU-specific calls have been implemented:
  iconvlist(), iconvctl(), iconv_canonicalize(), iconv_open_into()
- Support for GNU's //IGNORE suffix has been added.
- The "-" argument for stdin is now recognized in iconv(1) as per POSIX.
- The Big5 conversion module has been fixed.
- The iconv.h header files is supposed to be compatible with the
  GNU version, i.e. sources should build with base iconv.h and
  GNU libiconv. It also includes a macro magic to deal with the
  char ** and const char ** incompatibility.
- GNU compatibility: "" or "char" means the current local
  encoding in use
- Various cleanups and style(9) fixes.

Approved by:	delphij (mentor)
Obtained from:	The NetBSD Project
Sponsored by:	Google Summer of Code 2009

1 files changed, 374 insertions, 0 deletions

diff --git a/lib/libc/iconv/citrus_esdb.c b/lib/libc/iconv/citrus_esdb.c
new file mode 100644
index 0000000..578cbc1
--- /dev/null
+++ b/lib/libc/iconv/citrus_esdb.c
@@ -0,0 +1,374 @@
+/* $FreeBSD$ */
+/* $NetBSD: citrus_esdb.c,v 1.5 2008/02/09 14:56:20 junyoung Exp $ */
+
+/*-
+ * Copyright (c)2003 Citrus Project,
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+#include <assert.h>
+#include <errno.h>
+#include <limits.h>
+#include <paths.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "citrus_namespace.h"
+#include "citrus_types.h"
+#include "citrus_bcs.h"
+#include "citrus_region.h"
+#include "citrus_memstream.h"
+#include "citrus_mmap.h"
+#include "citrus_lookup.h"
+#include "citrus_db.h"
+#include "citrus_db_hash.h"
+#include "citrus_esdb.h"
+#include "citrus_esdb_file.h"
+
+#define ESDB_DIR	"esdb.dir"
+#define ESDB_ALIAS	"esdb.alias"
+
+/*
+ * _citrus_esdb_alias:
+ *	resolve encoding scheme name aliases.
+ */
+const char *
+_citrus_esdb_alias(const char *esname, char *buf, size_t bufsize)
+{
+
+	return (_lookup_alias(_PATH_ESDB "/" ESDB_ALIAS, esname, buf, bufsize,
+	    _LOOKUP_CASE_IGNORE));
+}
+
+
+/*
+ * conv_esdb:
+ *	external representation -> local structure.
+ */
+static int
+conv_esdb(struct _citrus_esdb *esdb, struct _region *fr)
+{
+	struct _citrus_db *db;
+	const char *str;
+	char buf[100];
+	uint32_t csid, i, num_charsets, tmp, version;
+	int ret;
+
+	/* open db */
+	ret = _db_open(&db, fr, _CITRUS_ESDB_MAGIC, &_db_hash_std, NULL);
+	if (ret)
+		goto err0;
+
+	/* check version */
+	ret = _db_lookup32_by_s(db, _CITRUS_ESDB_SYM_VERSION, &version, NULL);
+	if (ret)
+		goto err1;
+	switch (version) {
+	case 0x00000001:
+		/* current version */
+		/* initial version */
+		break;
+	default:
+		ret = EFTYPE;
+		goto err1;
+	}
+
+	/* get encoding/variable */
+	ret = _db_lookupstr_by_s(db, _CITRUS_ESDB_SYM_ENCODING, &str, NULL);
+	if (ret)
+		goto err1;
+	esdb->db_encname = strdup(str);
+	if (esdb->db_encname == NULL) {
+		ret = errno;
+		goto err1;
+	}
+
+	esdb->db_len_variable = 0;
+	esdb->db_variable = NULL;
+	ret = _db_lookupstr_by_s(db, _CITRUS_ESDB_SYM_VARIABLE, &str, NULL);
+	if (ret == 0) {
+		esdb->db_len_variable = strlen(str) + 1;
+		esdb->db_variable = strdup(str);
+		if (esdb->db_variable == NULL) {
+			ret = errno;
+			goto err2;
+		}
+	} else if (ret != ENOENT)
+		goto err2;
+
+	/* get number of charsets */
+	ret = _db_lookup32_by_s(db, _CITRUS_ESDB_SYM_NUM_CHARSETS,
+	    &num_charsets, NULL);
+	if (ret)
+		goto err3;
+	esdb->db_num_charsets = num_charsets;
+
+	/* get invalid character */
+	ret = _db_lookup32_by_s(db, _CITRUS_ESDB_SYM_INVALID, &tmp, NULL);
+	if (ret == 0) {
+		esdb->db_use_invalid = 1;
+		esdb->db_invalid = tmp;
+	} else if (ret == ENOENT)
+		esdb->db_use_invalid = 0;
+	else
+		goto err3;
+
+	/* get charsets */
+	esdb->db_charsets = malloc(num_charsets * sizeof(*esdb->db_charsets));
+	if (esdb->db_charsets == NULL) {
+		ret = errno;
+		goto err3;
+	}
+	for (i = 0; i < num_charsets; i++) {
+		snprintf(buf, sizeof(buf),
+		    _CITRUS_ESDB_SYM_CSID_PREFIX "%d", i);
+		ret = _db_lookup32_by_s(db, buf, &csid, NULL);
+		if (ret)
+			goto err4;
+		esdb->db_charsets[i].ec_csid = csid;
+
+		snprintf(buf, sizeof(buf),
+		    _CITRUS_ESDB_SYM_CSNAME_PREFIX "%d", i);
+		ret = _db_lookupstr_by_s(db, buf, &str, NULL);
+		if (ret)
+			goto err4;
+		esdb->db_charsets[i].ec_csname = strdup(str);
+		if (esdb->db_charsets[i].ec_csname == NULL) {
+			ret = errno;
+			goto err4;
+		}
+	}
+
+	_db_close(db);
+	return (0);
+
+err4:
+	for (; i > 0; i--)
+		free(esdb->db_charsets[i - 1].ec_csname);
+	free(esdb->db_charsets);
+err3:
+	free(esdb->db_variable);
+err2:
+	free(esdb->db_encname);
+err1:
+	_db_close(db);
+	if (ret == ENOENT)
+		ret = EFTYPE;
+err0:
+	return (ret);
+}
+
+/*
+ * _citrus_esdb_open:
+ *	open an ESDB file.
+ */
+int
+_citrus_esdb_open(struct _citrus_esdb *db, const char *esname)
+{
+	struct _region fr;
+	const char *realname, *encfile;
+	char buf1[PATH_MAX], buf2[PATH_MAX], path[PATH_MAX];
+	int ret;
+
+	snprintf(path, sizeof(path), "%s/%s", _PATH_ESDB, ESDB_ALIAS);
+	realname = _lookup_alias(path, esname, buf1, sizeof(buf1),
+	    _LOOKUP_CASE_IGNORE);
+
+	snprintf(path, sizeof(path), "%s/%s", _PATH_ESDB, ESDB_DIR);
+	encfile = _lookup_simple(path, realname, buf2, sizeof(buf2),
+	    _LOOKUP_CASE_IGNORE);
+	if (encfile == NULL)
+		return (ENOENT);
+
+	/* open file */
+	snprintf(path, sizeof(path), "%s/%s", _PATH_ESDB, encfile);
+	ret = _map_file(&fr, path);
+	if (ret)
+		return (ret);
+
+	ret = conv_esdb(db, &fr);
+
+	_unmap_file(&fr);
+
+	return (ret);
+}
+
+/*
+ * _citrus_esdb_close:
+ *	free an ESDB.
+ */
+void
+_citrus_esdb_close(struct _citrus_esdb *db)
+{
+
+	for (int i = 0; i < db->db_num_charsets; i++)
+		free(db->db_charsets[i].ec_csname);
+	db->db_num_charsets = 0;
+	free(db->db_charsets); db->db_charsets = NULL;
+	free(db->db_encname); db->db_encname = NULL;
+	db->db_len_variable = 0;
+	free(db->db_variable); db->db_variable = NULL;
+}
+
+/*
+ * _citrus_esdb_free_list:
+ *	free the list.
+ */
+void
+_citrus_esdb_free_list(char **list, size_t num)
+{
+
+	for (size_t i = 0; i < num; i++)
+		free(list[i]);
+	free(list);
+}
+
+/*
+ * _citrus_esdb_get_list:
+ *	get esdb entries.
+ */
+int
+_citrus_esdb_get_list(char ***rlist, size_t *rnum, bool sorted)
+{
+	struct _citrus_lookup *cla, *cld;
+	struct _region key, data;
+	char **list, **q;
+	char buf[PATH_MAX];
+	size_t num;
+	int ret;
+
+	num = 0;
+
+	ret = _lookup_seq_open(&cla, _PATH_ESDB "/" ESDB_ALIAS,
+	    _LOOKUP_CASE_IGNORE);
+	if (ret)
+		goto quit0;
+
+	ret = _lookup_seq_open(&cld, _PATH_ESDB "/" ESDB_DIR,
+	    _LOOKUP_CASE_IGNORE);
+	if (ret)
+		goto quit1;
+
+	/* count number of entries */
+	num = _lookup_get_num_entries(cla) + _lookup_get_num_entries(cld);
+
+	_lookup_seq_rewind(cla);
+	_lookup_seq_rewind(cld);
+
+	/* allocate list pointer space */
+	list = malloc(num * sizeof(char *));
+	num = 0;
+	if (list == NULL) {
+		ret = errno;
+		goto quit3;
+	}
+
+	/* get alias entries */
+	while ((ret = _lookup_seq_next(cla, &key, &data)) == 0) {
+		if (sorted)
+			snprintf(buf, sizeof(buf), "%.*s/%.*s",
+			    (int)_region_size(&data),
+			    (const char *)_region_head(&data),
+			    (int)_region_size(&key),
+			    (const char *)_region_head(&key));
+		else
+			snprintf(buf, sizeof(buf), "%.*s/%.*s",
+			    (int)_region_size(&data),
+			    (const char *)_region_head(&data),
+			    (int)_region_size(&key),
+			    (const char *)_region_head(&key));
+		_bcs_convert_to_upper(buf);
+		list[num] = strdup(buf);
+		if (list[num] == NULL) {
+			ret = errno;
+			goto quit3;
+		}
+		num++;
+	}
+	if (ret != ENOENT)
+		goto quit3;
+	/* get dir entries */
+	while ((ret = _lookup_seq_next(cld, &key, &data)) == 0) {
+		if (!sorted)
+			snprintf(buf, sizeof(buf), "%.*s",
+			    (int)_region_size(&key),
+			    (const char *)_region_head(&key));
+		else {
+			/* check duplicated entry */
+			char *p;
+			char buf1[PATH_MAX];
+
+			snprintf(buf1, sizeof(buf1), "%.*s",
+			    (int)_region_size(&data),
+			    (const char *)_region_head(&data));
+			if ((p = strchr(buf1, '/')) != NULL)
+				memcpy(buf1, p + 1, strlen(p) - 1);
+			if ((p = strstr(buf1, ".esdb")) != NULL)
+				*p = '\0';
+			snprintf(buf, sizeof(buf), "%s/%.*s", buf1,
+			    (int)_region_size(&key),
+			    (const char *)_region_head(&key));
+		}
+		_bcs_convert_to_upper(buf);
+		ret = _lookup_seq_lookup(cla, buf, NULL);
+		if (ret) {
+			if (ret != ENOENT)
+				goto quit3;
+			/* not duplicated */
+			list[num] = strdup(buf);
+			if (list[num] == NULL) {
+				ret = errno;
+				goto quit3;
+			}
+			num++;
+		}
+	}
+	if (ret != ENOENT)
+		goto quit3;
+
+	ret = 0;
+	/* XXX: why reallocing the list space posteriorly?
+	    shouldn't be done earlier? */
+	q = realloc(list, num * sizeof(char *));
+	if (!q) {
+		ret = ENOMEM;
+		goto quit3;
+	}
+	list = q;
+	*rlist = list;
+	*rnum = num;
+quit3:
+	if (ret)
+		_citrus_esdb_free_list(list, num);
+	_lookup_seq_close(cld);
+quit1:
+	_lookup_seq_close(cla);
+quit0:
+	return (ret);
+}