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, 332 insertions, 0 deletions

diff --git a/lib/libc/iconv/iconv.c b/lib/libc/iconv/iconv.c
new file mode 100644
index 0000000..2cd38df
--- /dev/null
+++ b/lib/libc/iconv/iconv.c
@@ -0,0 +1,332 @@
+/* $FreeBSD$ */
+/* $NetBSD: iconv.c,v 1.11 2009/03/03 16:22:33 explorer Exp $ */
+
+/*-
+ * Copyright (c) 2003 Citrus Project,
+ * Copyright (c) 2009, 2010 Gabor Kovesdan <gabor@FreeBSD.org>,
+ * 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/queue.h>
+#include <sys/types.h>
+
+#include <assert.h>
+#include <errno.h>
+#include <iconv.h>
+#include <limits.h>
+#include <paths.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "citrus_types.h"
+#include "citrus_module.h"
+#include "citrus_esdb.h"
+#include "citrus_hash.h"
+#include "citrus_iconv.h"
+
+#ifdef __weak_alias
+__weak_alias(libiconv, _iconv)
+__weak_alias(libiconv_open, _iconv_open)
+__weak_alias(libiconv_open_into, _iconv_open_into)
+__weak_alias(libiconv_close, _iconv_close)
+__weak_alias(libiconvlist, _iconvlist)
+__weak_alias(libiconvctl, _iconvctl)
+__weak_alias(libiconv_set_relocation_prefix, _iconv_set_relocation_prefix)
+__weak_alias(iconv_canonicalize, _iconv_canonicalize)
+#endif
+
+#define ISBADF(_h_)	(!(_h_) || (_h_) == (iconv_t)-1)
+
+int _libiconv_version = _LIBICONV_VERSION;
+
+iconv_t		 _iconv_open(const char *out, const char *in,
+		    struct _citrus_iconv *prealloc);
+
+iconv_t
+_iconv_open(const char *out, const char *in, struct _citrus_iconv *prealloc)
+{
+	struct _citrus_iconv *handle;
+	char *out_truncated, *p;
+	int ret;
+
+	handle = prealloc;
+
+	/*
+	 * Remove anything following a //, as these are options (like
+	 * //ignore, //translate, etc) and we just don't handle them.
+	 * This is for compatibilty with software that uses thees
+	 * blindly.
+	 */
+	out_truncated = strdup(out);
+	if (out_truncated == NULL) {
+		errno = ENOMEM;
+		return ((iconv_t)-1);
+	}
+		
+	p = out_truncated;
+        while (*p != 0) {
+                if (p[0] == '/' && p[1] == '/') {
+                        *p = '\0';
+                        break;
+                }
+                p++;
+        }
+
+	ret = _citrus_iconv_open(&handle, in, out_truncated);
+	free(out_truncated);
+	if (ret) {
+		errno = ret == ENOENT ? EINVAL : ret;
+		return ((iconv_t)-1);
+	}
+
+	handle->cv_shared->ci_discard_ilseq = strcasestr(out, "//IGNORE");
+	handle->cv_shared->ci_hooks = NULL;
+
+	return ((iconv_t)(void *)handle);
+}
+
+iconv_t
+libiconv_open(const char *out, const char *in)
+{
+
+	return (_iconv_open(out, in, NULL));
+}
+
+int
+libiconv_open_into(const char *out, const char *in, iconv_allocation_t *ptr)
+{
+	struct _citrus_iconv *handle;
+
+	handle = (struct _citrus_iconv *)ptr;
+	return ((_iconv_open(out, in, handle) == (iconv_t)-1) ? -1 : 0);
+}
+
+int
+libiconv_close(iconv_t handle)
+{
+
+	if (ISBADF(handle)) {
+		errno = EBADF;
+		return (-1);
+	}
+
+	_citrus_iconv_close((struct _citrus_iconv *)(void *)handle);
+
+	return (0);
+}
+
+size_t
+libiconv(iconv_t handle, char **in, size_t *szin, char **out, size_t *szout)
+{
+	size_t ret;
+	int err;
+
+	if (ISBADF(handle)) {
+		errno = EBADF;
+		return ((size_t)-1);
+	}
+
+	err = _citrus_iconv_convert((struct _citrus_iconv *)(void *)handle,
+	    in, szin, out, szout, 0, &ret);
+	if (err) {
+		errno = err;
+		ret = (size_t)-1;
+	}
+
+	return (ret);
+}
+
+size_t
+__iconv(iconv_t handle, char **in, size_t *szin, char **out,
+    size_t *szout, uint32_t flags, size_t *invalids)
+{
+	size_t ret;
+	int err;
+
+	if (ISBADF(handle)) {
+		errno = EBADF;
+		return ((size_t)-1);
+	}
+
+	err = _citrus_iconv_convert((struct _citrus_iconv *)(void *)handle,
+	    in, szin, out, szout, flags, &ret);
+	if (invalids)
+		*invalids = ret;
+	if (err) {
+		errno = err;
+		ret = (size_t)-1;
+	}
+
+	return (ret);
+}
+
+int
+__iconv_get_list(char ***rlist, size_t *rsz, bool sorted)
+{
+	int ret;
+
+	ret = _citrus_esdb_get_list(rlist, rsz, sorted);
+	if (ret) {
+		errno = ret;
+		return (-1);
+	}
+
+	return (0);
+}
+
+void
+__iconv_free_list(char **list, size_t sz)
+{
+
+	_citrus_esdb_free_list(list, sz);
+}
+
+/*
+ * GNU-compatibile non-standard interfaces.
+ */
+static int
+qsort_helper(const void *first, const void *second)
+{
+	const char * const *s1;
+	const char * const *s2;
+
+	s1 = first;
+	s2 = second;
+	return (strcmp(*s1, *s2));
+}
+
+void
+libiconvlist(int (*do_one) (unsigned int, const char * const *,
+    void *), void *data)
+{
+	char **list, **names;
+	const char * const *np;
+	char *curitem, *curkey, *slashpos;
+	size_t sz;
+	unsigned int i, j;
+
+	i = 0;
+
+	if (__iconv_get_list(&list, &sz, true))
+		list = NULL;
+	qsort((void *)list, sz, sizeof(char *), qsort_helper);
+	while (i < sz) {
+		j = 0;
+		slashpos = strchr(list[i], '/');
+		curkey = (char *)malloc(slashpos - list[i] + 2);
+		names = (char **)malloc(sz * sizeof(char *));
+		if ((curkey == NULL) || (names == NULL)) {
+			__iconv_free_list(list, sz);
+			return;
+		}
+		strlcpy(curkey, list[i], slashpos - list[i] + 1);
+		names[j++] = strdup(curkey);
+		for (; (i < sz) && (memcmp(curkey, list[i], strlen(curkey)) == 0); i++) {
+			slashpos = strchr(list[i], '/');
+			curitem = (char *)malloc(strlen(slashpos) + 1);
+			if (curitem == NULL) {
+				__iconv_free_list(list, sz);
+				return;
+			}
+			strlcpy(curitem, &slashpos[1], strlen(slashpos) + 1);
+			if (strcmp(curkey, curitem) == 0) {
+				continue;
+			}
+			names[j++] = strdup(curitem);
+		}
+		np = (const char * const *)names;
+		do_one(j, np, data);
+		free(names);
+	}
+
+	__iconv_free_list(list, sz);
+}
+
+__inline const char
+*iconv_canonicalize(const char *name)
+{
+
+	return (_citrus_iconv_canonicalize(name));
+}
+
+int
+libiconvctl(iconv_t cd, int request, void *argument)
+{
+	struct _citrus_iconv *cv;
+	struct iconv_hooks *hooks;
+	const char *convname;
+	char src[PATH_MAX], *dst;
+	int *i;
+
+	cv = (struct _citrus_iconv *)(void *)cd;
+	hooks = (struct iconv_hooks *)argument;
+	i = (int *)argument;
+
+	if (ISBADF(cd)) {
+		errno = EBADF;
+		return (-1);
+	}
+
+	switch (request) {
+	case ICONV_TRIVIALP:
+		convname = cv->cv_shared->ci_convname;
+		dst = strchr(convname, '/');
+
+		strlcpy(src, convname, dst - convname + 1);
+		dst++;
+		if ((convname == NULL) || (src == NULL) || (dst == NULL))
+			return (-1);
+		*i = strcmp(src, dst) == 0 ? 1 : 0;
+		return (0);
+	case ICONV_GET_TRANSLITERATE:
+		*i = 1;
+		return (0);
+	case ICONV_SET_TRANSLITERATE:
+		return  ((*i == 1) ? 0 : -1);
+	case ICONV_GET_DISCARD_ILSEQ:
+		*i = cv->cv_shared->ci_discard_ilseq ? 1 : 0;
+		return (0);
+	case ICONV_SET_DISCARD_ILSEQ:
+		cv->cv_shared->ci_discard_ilseq = *i;
+		return (0);
+	case ICONV_SET_HOOKS:
+		cv->cv_shared->ci_hooks = hooks;
+		return (0);
+	case ICONV_SET_FALLBACKS:
+		errno = EOPNOTSUPP;
+		return (-1);
+	default:
+		errno = EINVAL;
+		return (-1);
+	}
+}
+
+void
+libiconv_set_relocation_prefix(const char *orig_prefix __unused,
+    const char *curr_prefix __unused)
+{
+
+}