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, 412 insertions, 0 deletions

diff --git a/lib/libiconv_modules/UES/citrus_ues.c b/lib/libiconv_modules/UES/citrus_ues.c
new file mode 100644
index 0000000..1c4bc83
--- /dev/null
+++ b/lib/libiconv_modules/UES/citrus_ues.c
@@ -0,0 +1,412 @@
+/* $FreeBSD$ */
+/* $NetBSD: citrus_ues.c,v 1.1 2006/11/13 15:16:31 tnozaki Exp $ */
+
+/*-
+ * Copyright (c)2006 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 <assert.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <wchar.h>
+
+#include "citrus_namespace.h"
+#include "citrus_types.h"
+#include "citrus_bcs.h"
+#include "citrus_module.h"
+#include "citrus_stdenc.h"
+#include "citrus_ues.h"
+
+typedef struct {
+	size_t	 mb_cur_max;
+	int	 mode;
+#define MODE_C99	1
+} _UESEncodingInfo;
+
+typedef struct {
+	int	 chlen;
+	char	 ch[12];
+} _UESState;
+
+#define _CEI_TO_EI(_cei_)               (&(_cei_)->ei)
+#define _CEI_TO_STATE(_cei_, _func_)    (_cei_)->states.s_##_func_
+
+#define _FUNCNAME(m)			_citrus_UES_##m
+#define _ENCODING_INFO			_UESEncodingInfo
+#define _ENCODING_STATE			_UESState
+#define _ENCODING_MB_CUR_MAX(_ei_)	(_ei_)->mb_cur_max
+#define _ENCODING_IS_STATE_DEPENDENT		0
+#define _STATE_NEEDS_EXPLICIT_INIT(_ps_)	0
+
+static __inline void
+/*ARGSUSED*/
+_citrus_UES_init_state(_UESEncodingInfo * __restrict ei __unused,
+    _UESState * __restrict psenc)
+{
+
+	psenc->chlen = 0;
+}
+
+static __inline void
+/*ARGSUSED*/
+_citrus_UES_pack_state(_UESEncodingInfo * __restrict ei __unused,
+    void *__restrict pspriv, const _UESState * __restrict psenc)
+{
+
+	memcpy(pspriv, (const void *)psenc, sizeof(*psenc));
+}
+
+static __inline void
+/*ARGSUSED*/
+_citrus_UES_unpack_state(_UESEncodingInfo * __restrict ei __unused,
+    _UESState * __restrict psenc, const void * __restrict pspriv)
+{
+
+	memcpy((void *)psenc, pspriv, sizeof(*psenc));
+}
+
+static __inline int
+to_int(int ch)
+{
+
+	if (ch >= '0' && ch <= '9')
+		return (ch - '0');
+	else if (ch >= 'A' && ch <= 'F')
+		return ((ch - 'A') + 10);
+	else if (ch >= 'a' && ch <= 'f')
+		return ((ch - 'a') + 10);
+	return (-1);
+}
+
+#define ESCAPE		'\\'
+#define UCS2_ESC	'u'
+#define UCS4_ESC	'U'
+
+#define UCS2_BIT	16
+#define UCS4_BIT	32
+#define BMP_MAX		UINT32_C(0xFFFF)
+#define UCS2_MAX	UINT32_C(0x10FFFF)
+#define UCS4_MAX	UINT32_C(0x7FFFFFFF)
+
+static const char *xdig = "0123456789abcdef";
+
+static __inline int
+to_str(char *s, wchar_t wc, int bit)
+{
+	char *p;
+
+	p = s;
+	*p++ = ESCAPE;
+	switch (bit) {
+	case UCS2_BIT:
+		*p++ = UCS2_ESC;
+		break;
+	case UCS4_BIT:
+		*p++ = UCS4_ESC;
+		break;
+	default:
+		abort();
+	}
+	do {
+		*p++ = xdig[(wc >> (bit -= 4)) & 0xF];
+	} while (bit > 0);
+	return (p - s);
+}
+
+static __inline bool
+is_hi_surrogate(wchar_t wc)
+{
+
+	return (wc >= 0xD800 && wc <= 0xDBFF);
+}
+
+static __inline bool
+is_lo_surrogate(wchar_t wc)
+{
+
+	return (wc >= 0xDC00 && wc <= 0xDFFF);
+}
+
+static __inline wchar_t
+surrogate_to_ucs(wchar_t hi, wchar_t lo)
+{
+
+	hi -= 0xD800;
+	lo -= 0xDC00;
+	return ((hi << 10 | lo) + 0x10000);
+}
+
+static __inline void
+ucs_to_surrogate(wchar_t wc, wchar_t * __restrict hi, wchar_t * __restrict lo)
+{
+
+	wc -= 0x10000;
+	*hi = (wc >> 10) + 0xD800;
+	*lo = (wc & 0x3FF) + 0xDC00;
+}
+
+static __inline bool
+is_basic(wchar_t wc)
+{
+
+	return ((uint32_t)wc <= 0x9F && wc != 0x24 && wc != 0x40 &&
+	    wc != 0x60);
+}
+
+static int
+_citrus_UES_mbrtowc_priv(_UESEncodingInfo * __restrict ei,
+    wchar_t * __restrict pwc, char ** __restrict s, size_t n,
+    _UESState * __restrict psenc, size_t * __restrict nresult)
+{
+	char *s0;
+	int ch, head, num, tail;
+	wchar_t hi, wc;
+
+	if (*s == NULL) {
+		_citrus_UES_init_state(ei, psenc);
+		*nresult = 0;
+		return (0);
+	}
+	s0 = *s;
+
+	hi = (wchar_t)0;
+	tail = 0;
+
+surrogate:
+	wc = (wchar_t)0;
+	head = tail;
+	if (psenc->chlen == head) {
+		if (n-- < 1)
+			goto restart;
+		psenc->ch[psenc->chlen++] = *s0++;
+	}
+	ch = (unsigned char)psenc->ch[head++];
+	if (ch == ESCAPE) {
+		if (psenc->chlen == head) {
+			if (n-- < 1)
+				goto restart;
+			psenc->ch[psenc->chlen++] = *s0++;
+		}
+		switch (psenc->ch[head]) {
+		case UCS2_ESC:
+			tail += 6;
+			break;
+		case UCS4_ESC:
+			if (ei->mode & MODE_C99) {
+				tail = 10;
+				break;
+			}
+		/*FALLTHROUGH*/
+		default:
+			tail = 0;
+		}
+		++head;
+	}
+	for (; head < tail; ++head) {
+		if (psenc->chlen == head) {
+			if (n-- < 1) {
+restart:
+				*s = s0;
+				*nresult = (size_t)-2;
+				return (0);
+			}
+			psenc->ch[psenc->chlen++] = *s0++;
+		}
+		num = to_int((int)(unsigned char)psenc->ch[head]);
+		if (num < 0) {
+			tail = 0;
+			break;
+		}
+		wc = (wc << 4) | num;
+	}
+	head = 0;
+	switch (tail) {
+	case 0:
+		break;
+	case 6:
+		if (hi != (wchar_t)0)
+			break;
+		if ((ei->mode & MODE_C99) == 0) {
+			if (is_hi_surrogate(wc) != 0) {
+				hi = wc;
+				goto surrogate;
+			}
+			if ((uint32_t)wc <= 0x7F /* XXX */ ||
+			    is_lo_surrogate(wc) != 0)
+				break;
+			goto done;
+		}
+	/*FALLTHROUGH*/
+	case 10:
+		if (is_basic(wc) == 0 && (uint32_t)wc <= UCS4_MAX &&
+		    is_hi_surrogate(wc) == 0 && is_lo_surrogate(wc) == 0)
+			goto done;
+		*nresult = (size_t)-1;
+		return (EILSEQ);
+	case 12:
+		if (is_lo_surrogate(wc) == 0)
+			break;
+		wc = surrogate_to_ucs(hi, wc);
+		goto done;
+	}
+	ch = (unsigned char)psenc->ch[0];
+	head = psenc->chlen;
+	if (--head > 0)
+		memmove(&psenc->ch[0], &psenc->ch[1], head);
+	wc = (wchar_t)ch;
+done:
+	psenc->chlen = head;
+	if (pwc != NULL)
+		*pwc = wc;
+	*nresult = (size_t)((wc == 0) ? 0 : (s0 - *s));
+	*s = s0;
+
+	return (0);
+}
+
+static int
+_citrus_UES_wcrtomb_priv(_UESEncodingInfo * __restrict ei,
+    char * __restrict s, size_t n, wchar_t wc,
+    _UESState * __restrict psenc, size_t * __restrict nresult)
+{
+	wchar_t hi, lo;
+
+	if (psenc->chlen != 0)
+		return (EINVAL);
+
+	if ((ei->mode & MODE_C99) ? is_basic(wc) : (uint32_t)wc <= 0x7F) {
+		if (n-- < 1)
+			goto e2big;
+		psenc->ch[psenc->chlen++] = (char)wc;
+	} else if ((uint32_t)wc <= BMP_MAX) {
+		if (n < 6)
+			goto e2big;
+		psenc->chlen = to_str(&psenc->ch[0], wc, UCS2_BIT);
+	} else if ((ei->mode & MODE_C99) == 0 && (uint32_t)wc <= UCS2_MAX) {
+		if (n < 12)
+			goto e2big;
+		ucs_to_surrogate(wc, &hi, &lo);
+		psenc->chlen += to_str(&psenc->ch[0], hi, UCS2_BIT);
+		psenc->chlen += to_str(&psenc->ch[6], lo, UCS2_BIT);
+	} else if ((ei->mode & MODE_C99) && (uint32_t)wc <= UCS4_MAX) {
+		if (n < 10)
+			goto e2big;
+		psenc->chlen = to_str(&psenc->ch[0], wc, UCS4_BIT);
+	} else {
+		*nresult = (size_t)-1;
+		return (EILSEQ);
+	}
+	memcpy(s, psenc->ch, psenc->chlen);
+	*nresult = psenc->chlen;
+	psenc->chlen = 0;
+
+	return (0);
+
+e2big:
+	*nresult = (size_t)-1;
+	return (E2BIG);
+}
+
+/*ARGSUSED*/
+static int
+_citrus_UES_stdenc_wctocs(_UESEncodingInfo * __restrict ei __unused,
+    _csid_t * __restrict csid, _index_t * __restrict idx, wchar_t wc)
+{
+
+	*csid = 0;
+	*idx = (_index_t)wc;
+
+	return (0);
+}
+
+static __inline int
+/*ARGSUSED*/
+_citrus_UES_stdenc_cstowc(_UESEncodingInfo * __restrict ei __unused,
+    wchar_t * __restrict wc, _csid_t csid, _index_t idx)
+{
+
+	if (csid != 0)
+		return (EILSEQ);
+	*wc = (wchar_t)idx;
+
+	return (0);
+}
+
+static __inline int
+/*ARGSUSED*/
+_citrus_UES_stdenc_get_state_desc_generic(_UESEncodingInfo * __restrict ei __unused,
+    _UESState * __restrict psenc, int * __restrict rstate)
+{
+
+	*rstate = (psenc->chlen == 0) ? _STDENC_SDGEN_INITIAL :
+	    _STDENC_SDGEN_INCOMPLETE_CHAR;
+	return (0);
+}
+
+static void
+/*ARGSUSED*/
+_citrus_UES_encoding_module_uninit(_UESEncodingInfo *ei __unused)
+{
+
+	/* ei seems to be unused */
+}
+
+static int
+/*ARGSUSED*/
+_citrus_UES_encoding_module_init(_UESEncodingInfo * __restrict ei,
+    const void * __restrict var, size_t lenvar)
+{
+	const char *p;
+
+	p = var;
+	memset((void *)ei, 0, sizeof(*ei));
+	while (lenvar > 0) {
+		switch (_bcs_toupper(*p)) {
+		case 'C':
+			MATCH(C99, ei->mode |= MODE_C99);
+			break;
+		}
+		++p;
+		--lenvar;
+	}
+	ei->mb_cur_max = (ei->mode & MODE_C99) ? 10 : 12;
+
+	return (0);
+}
+
+/* ----------------------------------------------------------------------
+ * public interface for stdenc
+ */
+
+_CITRUS_STDENC_DECLS(UES);
+_CITRUS_STDENC_DEF_OPS(UES);
+
+#include "citrus_stdenc_template.h"