added tag v1_9_0_4

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v1_9_0_4@18845 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1142 insertions, 0 deletions

diff --git a/trunk/ext/iconv/iconv.c b/trunk/ext/iconv/iconv.c
new file mode 100644
index 0000000000..6141a5bb4d
--- /dev/null
+++ b/trunk/ext/iconv/iconv.c
@@ -0,0 +1,1142 @@
+/* -*- mode:c; c-file-style:"ruby" -*- */
+/**********************************************************************
+
+  iconv.c -
+
+  $Author$
+  created at: Wed Dec  1 20:28:09 JST 1999
+
+  All the files in this distribution are covered under the Ruby's
+  license (see the file COPYING).
+
+  Documentation by Yukihiro Matsumoto and Gavin Sinclair.
+
+**********************************************************************/
+
+#include "ruby/ruby.h"
+#include <errno.h>
+#include <iconv.h>
+#include <assert.h>
+#include "ruby/st.h"
+#include "ruby/intern.h"
+#include "ruby/encoding.h"
+
+/*
+ * Document-class: Iconv
+ *
+ * == Summary
+ *
+ * Ruby extension for charset conversion.
+ * 
+ * == Abstract
+ *
+ * Iconv is a wrapper class for the UNIX 95 <tt>iconv()</tt> function family,
+ * which translates string between various encoding systems.
+ * 
+ * See Open Group's on-line documents for more details.
+ * * <tt>iconv.h</tt>:       http://www.opengroup.org/onlinepubs/007908799/xsh/iconv.h.html
+ * * <tt>iconv_open()</tt>:  http://www.opengroup.org/onlinepubs/007908799/xsh/iconv_open.html
+ * * <tt>iconv()</tt>:       http://www.opengroup.org/onlinepubs/007908799/xsh/iconv.html
+ * * <tt>iconv_close()</tt>: http://www.opengroup.org/onlinepubs/007908799/xsh/iconv_close.html
+ * 
+ * Which coding systems are available is platform-dependent.
+ * 
+ * == Examples
+ *
+ * 1. Simple conversion between two charsets.
+ *
+ *      converted_text = Iconv.conv('iso-8859-15', 'utf-8', text)
+ *
+ * 2. Instantiate a new Iconv and use method Iconv#iconv.
+ *
+ *      cd = Iconv.new(to, from)
+ *      begin
+ *        input.each { |s| output << cd.iconv(s) }
+ *        output << cd.iconv(nil)                   # Don't forget this!
+ *      ensure
+ *        cd.close
+ *      end
+ *
+ * 3. Invoke Iconv.open with a block.
+ *
+ *      Iconv.open(to, from) do |cd|
+ *        input.each { |s| output << cd.iconv(s) }
+ *        output << cd.iconv(nil)
+ *      end
+ *
+ * 4. Shorthand for (3).
+ *
+ *      Iconv.iconv(to, from, *input.to_a)
+ */
+
+/* Invalid value for iconv_t is -1 but 0 for VALUE, I hope VALUE is
+   big enough to keep iconv_t */
+#define VALUE2ICONV(v) ((iconv_t)((VALUE)(v) ^ -1))
+#define ICONV2VALUE(c) ((VALUE)(c) ^ -1)
+
+struct iconv_env_t
+{
+    iconv_t cd;
+    int argc;
+    VALUE *argv;
+    VALUE ret;
+    int toidx;
+    VALUE (*append)_((VALUE, VALUE));
+};
+
+struct rb_iconv_opt_t
+{
+    VALUE transliterate;
+    VALUE discard_ilseq;
+};
+
+static ID id_transliterate, id_discard_ilseq;
+
+static VALUE rb_eIconvInvalidEncoding;
+static VALUE rb_eIconvFailure;
+static VALUE rb_eIconvIllegalSeq;
+static VALUE rb_eIconvInvalidChar;
+static VALUE rb_eIconvOutOfRange;
+static VALUE rb_eIconvBrokenLibrary;
+
+static ID rb_success, rb_failed;
+static VALUE iconv_fail _((VALUE error, VALUE success, VALUE failed, struct iconv_env_t* env, const char *mesg));
+static VALUE iconv_failure_initialize _((VALUE error, VALUE mesg, VALUE success, VALUE failed));
+static VALUE iconv_failure_success _((VALUE self));
+static VALUE iconv_failure_failed _((VALUE self));
+
+static iconv_t iconv_create _((VALUE to, VALUE from, struct rb_iconv_opt_t *opt, int *idx));
+static void iconv_dfree _((void *cd));
+static VALUE iconv_free _((VALUE cd));
+static VALUE iconv_try _((iconv_t cd, const char **inptr, size_t *inlen, char **outptr, size_t *outlen));
+static VALUE rb_str_derive _((VALUE str, const char* ptr, int len));
+static VALUE iconv_convert _((iconv_t cd, VALUE str, long start, long length, int toidx,
+			      struct iconv_env_t* env));
+static VALUE iconv_s_allocate _((VALUE klass));
+static VALUE iconv_initialize _((int argc, VALUE *argv, VALUE self));
+static VALUE iconv_s_open _((int argc, VALUE *argv, VALUE self));
+static VALUE iconv_s_convert _((struct iconv_env_t* env));
+static VALUE iconv_s_iconv _((int argc, VALUE *argv, VALUE self));
+static VALUE iconv_init_state _((VALUE cd));
+static VALUE iconv_finish _((VALUE self));
+static VALUE iconv_iconv _((int argc, VALUE *argv, VALUE self));
+static VALUE iconv_conv _((int argc, VALUE *argv, VALUE self));
+
+static VALUE charset_map;
+
+/*
+ * Document-method: charset_map
+ * call-seq: Iconv.charset_map
+ *
+ * Returns the map from canonical name to system dependent name.
+ */
+static VALUE
+charset_map_get(void)
+{
+    return charset_map;
+}
+
+static char *
+map_charset(VALUE *code)
+{
+    VALUE val = *code;
+
+    if (RHASH_SIZE(charset_map)) {
+	VALUE key = rb_funcall2(val, rb_intern("downcase"), 0, 0);
+	StringValuePtr(key);
+	if (st_lookup(RHASH_TBL(charset_map), key, &val)) {
+	    *code = val;
+	}
+    }
+    return StringValuePtr(*code);
+}
+
+static iconv_t
+iconv_create(VALUE to, VALUE from, struct rb_iconv_opt_t *opt, int *idx)
+{
+    const char* tocode = map_charset(&to);
+    const char* fromcode = map_charset(&from);
+    iconv_t cd;
+
+    if ((*idx = rb_enc_find_index(tocode)) < 0) {
+	const char *slash = strchr(tocode, '/');
+	if (slash && slash[1] == '/') {
+	    VALUE tmp = rb_str_new(tocode, slash - tocode);
+	    *idx = rb_enc_find_index(RSTRING_PTR(tmp));
+	}
+    }
+
+    cd = iconv_open(tocode, fromcode);
+    if (cd == (iconv_t)-1) {
+	switch (errno) {
+	  case EMFILE:
+	  case ENFILE:
+	  case ENOMEM:
+	    rb_gc();
+	    cd = iconv_open(tocode, fromcode);
+	}
+	if (cd == (iconv_t)-1) {
+	    int inval = errno == EINVAL;
+	    const char *s = inval ? "invalid encoding " : "iconv";
+	    volatile VALUE msg = rb_str_new(0, strlen(s) + RSTRING_LEN(to) +
+					    RSTRING_LEN(from) + 8);
+
+	    sprintf(RSTRING_PTR(msg), "%s(\"%s\", \"%s\")",
+		    s, RSTRING_PTR(to), RSTRING_PTR(from));
+	    s = RSTRING_PTR(msg);
+	    rb_str_set_len(msg, strlen(s));
+	    if (!inval) rb_sys_fail(s);
+	    iconv_fail(rb_eIconvInvalidEncoding,
+		       Qnil, rb_ary_new3(2, to, from), NULL, s);
+	}
+    }
+
+    if (opt) {
+#ifdef ICONV_SET_TRANSLITERATE
+	if (opt->transliterate != Qundef) {
+	    int flag = RTEST(opt->transliterate);
+	    if (iconvctl(cd, ICONV_SET_TRANSLITERATE, (void *)&flag))
+		rb_sys_fail("ICONV_SET_TRANSLITERATE");
+	}
+#endif
+#ifdef ICONV_SET_DISCARD_ILSEQ
+	if (opt->discard_ilseq != Qundef) {
+	    int flag = RTEST(opt->discard_ilseq);
+	    if (iconvctl(cd, ICONV_SET_DISCARD_ILSEQ, (void *)&flag))
+		rb_sys_fail("ICONV_SET_DISCARD_ILSEQ");
+	}
+#endif
+    }
+
+    return cd;
+}
+
+static void
+iconv_dfree(void *cd)
+{
+    iconv_close(VALUE2ICONV(cd));
+}
+
+#define ICONV_FREE iconv_dfree
+
+static VALUE
+iconv_free(VALUE cd)
+{
+    if (cd && iconv_close(VALUE2ICONV(cd)) == -1)
+	rb_sys_fail("iconv_close");
+    return Qnil;
+}
+
+static VALUE
+check_iconv(VALUE obj)
+{
+    Check_Type(obj, T_DATA);
+    if (RDATA(obj)->dfree != ICONV_FREE) {
+	rb_raise(rb_eArgError, "Iconv expected (%s)", rb_class2name(CLASS_OF(obj)));
+    }
+    return (VALUE)DATA_PTR(obj);
+}
+
+static VALUE
+iconv_try(iconv_t cd, const char **inptr, size_t *inlen, char **outptr, size_t *outlen)
+{
+#ifdef ICONV_INPTR_CONST
+#define ICONV_INPTR_CAST
+#else
+#define ICONV_INPTR_CAST (char **)
+#endif
+    size_t ret;
+
+    errno = 0;
+    ret = iconv(cd, ICONV_INPTR_CAST inptr, inlen, outptr, outlen);
+    if (ret == (size_t)-1) {
+	if (!*inlen)
+	    return Qfalse;
+	switch (errno) {
+	  case E2BIG:
+	    /* try the left in next loop */
+	    break;
+	  case EILSEQ:
+	    return rb_eIconvIllegalSeq;
+	  case EINVAL:
+	    return rb_eIconvInvalidChar;
+	  case 0:
+	    return rb_eIconvBrokenLibrary;
+	  default:
+	    rb_sys_fail("iconv");
+	}
+    }
+    else if (*inlen > 0) {
+	/* something goes wrong */
+	return rb_eIconvIllegalSeq;
+    }
+    else if (ret) {
+	return Qnil;		/* conversion */
+    }
+    return Qfalse;
+}
+
+#define FAILED_MAXLEN 16
+
+static VALUE
+iconv_failure_initialize(VALUE error, VALUE mesg, VALUE success, VALUE failed)
+{
+    rb_call_super(1, &mesg);
+    rb_ivar_set(error, rb_success, success);
+    rb_ivar_set(error, rb_failed, failed);
+    return error;
+}
+
+static VALUE
+iconv_fail(VALUE error, VALUE success, VALUE failed, struct iconv_env_t* env, const char *mesg)
+{
+    VALUE args[3];
+
+    if (mesg && *mesg) {
+	args[0] = rb_str_new2(mesg);
+    }
+    else if (TYPE(failed) != T_STRING || RSTRING_LEN(failed) < FAILED_MAXLEN) {
+	args[0] = rb_inspect(failed);
+    }
+    else {
+	args[0] = rb_inspect(rb_str_substr(failed, 0, FAILED_MAXLEN));
+	rb_str_cat2(args[0], "...");
+    }
+    args[1] = success;
+    args[2] = failed;
+    if (env) {
+	args[1] = env->append(rb_obj_dup(env->ret), success);
+	if (env->argc > 0) {
+	    *(env->argv) = failed;
+	    args[2] = rb_ary_new4(env->argc, env->argv);
+	}
+    }
+    error = rb_class_new_instance(3, args, error);
+    if (!rb_block_given_p()) rb_exc_raise(error);
+    rb_set_errinfo(error);
+    return rb_yield(failed);
+}
+
+static VALUE
+rb_str_derive(VALUE str, const char* ptr, int len)
+{
+    VALUE ret;
+
+    if (NIL_P(str))
+	return rb_str_new(ptr, len);
+    if (RSTRING_PTR(str) + RSTRING_LEN(str) == ptr + len)
+	ret = rb_str_subseq(str, ptr - RSTRING_PTR(str), len);
+    else
+	ret = rb_str_new(ptr, len);
+    OBJ_INFECT(ret, str);
+    return ret;
+}
+
+static VALUE
+iconv_convert(iconv_t cd, VALUE str, long start, long length, int toidx, struct iconv_env_t* env)
+{
+    VALUE ret = Qfalse;
+    VALUE error = Qfalse;
+    VALUE rescue;
+    const char *inptr, *instart;
+    size_t inlen;
+    /* I believe ONE CHARACTER never exceed this. */
+    char buffer[BUFSIZ];
+    char *outptr;
+    size_t outlen;
+
+    if (cd == (iconv_t)-1)
+	rb_raise(rb_eArgError, "closed iconv");
+
+    if (NIL_P(str)) {
+	/* Reset output pointer or something. */
+	inptr = "";
+	inlen = 0;
+	outptr = buffer;
+	outlen = sizeof(buffer);
+	error = iconv_try(cd, &inptr, &inlen, &outptr, &outlen);
+	if (RTEST(error)) {
+	    unsigned int i;
+	    rescue = iconv_fail(error, Qnil, Qnil, env, 0);
+	    if (TYPE(rescue) == T_ARRAY) {
+		str = RARRAY_LEN(rescue) > 0 ? RARRAY_PTR(rescue)[0] : Qnil;
+	    }
+	    if (FIXNUM_P(str) && (i = FIX2INT(str)) <= 0xff) {
+		char c = i;
+		str = rb_str_new(&c, 1);
+	    }
+	    else if (!NIL_P(str)) {
+		StringValue(str);
+	    }
+	}
+
+	inptr = NULL;
+	length = 0;
+    }
+    else {
+	int slen;
+
+	StringValue(str);
+	slen = RSTRING_LEN(str);
+	inptr = RSTRING_PTR(str);
+
+	inptr += start;
+	if (length < 0 || length > start + slen)
+	    length = slen - start;
+    }
+    instart = inptr;
+    inlen = length;
+
+    do {
+	char errmsg[50];
+	const char *tmpstart = inptr;
+	outptr = buffer;
+	outlen = sizeof(buffer);
+
+	errmsg[0] = 0;
+	error = iconv_try(cd, &inptr, &inlen, &outptr, &outlen);
+
+	if (0 <= outlen && outlen <= sizeof(buffer)) {
+	    outlen = sizeof(buffer) - outlen;
+	    if (NIL_P(error) ||	/* something converted */
+		outlen > inptr - tmpstart || /* input can't contain output */
+		(outlen < inptr - tmpstart && inlen > 0) || /* something skipped */
+		memcmp(buffer, tmpstart, outlen)) /* something differs */
+	    {
+		if (NIL_P(str)) {
+		    ret = rb_str_new(buffer, outlen);
+		    if (toidx >= 0) rb_enc_associate_index(ret, toidx);
+		}
+		else {
+		    if (ret) {
+			ret = rb_str_buf_cat(ret, instart, tmpstart - instart);
+		    }
+		    else {
+			ret = rb_str_new(instart, tmpstart - instart);
+			if (toidx >= 0) rb_enc_associate_index(ret, toidx);
+			OBJ_INFECT(ret, str);
+		    }
+		    ret = rb_str_buf_cat(ret, buffer, outlen);
+		    instart = inptr;
+		}
+	    }
+	    else if (!inlen) {
+		inptr = tmpstart + outlen;
+	    }
+	}
+	else {
+	    /* Some iconv() have a bug, return *outlen out of range */
+	    sprintf(errmsg, "bug?(output length = %ld)", (long)(sizeof(buffer) - outlen));
+	    error = rb_eIconvOutOfRange;
+	}
+
+	if (RTEST(error)) {
+	    long len = 0;
+
+	    if (!ret) {
+		ret = rb_str_derive(str, instart, inptr - instart);
+		if (toidx >= 0) rb_enc_associate_index(ret, toidx);
+	    }
+	    else if (inptr > instart) {
+		rb_str_cat(ret, instart, inptr - instart);
+	    }
+	    str = rb_str_derive(str, inptr, inlen);
+	    rescue = iconv_fail(error, ret, str, env, errmsg);
+	    if (TYPE(rescue) == T_ARRAY) {
+		if ((len = RARRAY_LEN(rescue)) > 0)
+		    rb_str_concat(ret, RARRAY_PTR(rescue)[0]);
+		if (len > 1 && !NIL_P(str = RARRAY_PTR(rescue)[1])) {
+		    StringValue(str);
+		    inlen = length = RSTRING_LEN(str);
+		    instart = inptr = RSTRING_PTR(str);
+		    continue;
+		}
+	    }
+	    else if (!NIL_P(rescue)) {
+		rb_str_concat(ret, rescue);
+	    }
+	    break;
+	}
+    } while (inlen > 0);
+
+    if (!ret) {
+	ret = rb_str_derive(str, instart, inptr - instart);
+	if (toidx >= 0) rb_enc_associate_index(ret, toidx);
+    }
+    else if (inptr > instart) {
+	rb_str_cat(ret, instart, inptr - instart);
+    }
+    return ret;
+}
+
+static VALUE
+iconv_s_allocate(VALUE klass)
+{
+    return Data_Wrap_Struct(klass, 0, ICONV_FREE, 0);
+}
+
+static VALUE
+get_iconv_opt_i(VALUE i, VALUE arg)
+{
+    struct rb_iconv_opt_t *opt = (struct rb_iconv_opt_t *)arg;
+    VALUE name, val;
+
+    (void)opt;
+    i = rb_Array(i);
+    name = rb_ary_entry(i, 0);
+    val = rb_ary_entry(i, 1);
+    do {
+	if (SYMBOL_P(name)) {
+	    ID id = SYM2ID(name);
+	    if (id == id_transliterate) {
+#ifdef ICONV_SET_TRANSLITERATE
+		opt->transliterate = val;
+#else
+		rb_notimplement();
+#endif
+		break;
+	    }
+	    if (id == id_discard_ilseq) {
+#ifdef ICONV_SET_DISCARD_ILSEQ
+		opt->discard_ilseq = val;
+#else
+		rb_notimplement();
+#endif
+		break;
+	    }
+	}
+	else {
+	    const char *s = StringValueCStr(name);
+	    if (strcmp(s, "transliterate") == 0) {
+#ifdef ICONV_SET_TRANSLITERATE
+		opt->transliterate = val;
+#else
+		rb_notimplement();
+#endif
+		break;
+	    }
+	    if (strcmp(s, "discard_ilseq") == 0) {
+#ifdef ICONV_SET_DISCARD_ILSEQ
+		opt->discard_ilseq = val;
+#else
+		rb_notimplement();
+#endif
+		break;
+	    }
+	}
+	name = rb_inspect(name);
+	rb_raise(rb_eArgError, "unknown option - %s", StringValueCStr(name));
+    } while (0);
+    return Qnil;
+}
+
+static void
+get_iconv_opt(struct rb_iconv_opt_t *opt, VALUE options)
+{
+    opt->transliterate = Qundef;
+    opt->discard_ilseq = Qundef;
+    if (!NIL_P(options)) {
+	rb_block_call(options, rb_intern("each"), 0, 0, get_iconv_opt_i, (VALUE)opt);
+    }
+}
+
+#define iconv_ctl(self, func, val) (\
+	iconvctl(VALUE2ICONV(check_iconv(self)), func, (void *)&(val)) ? \
+	rb_sys_fail(#func) : (void)0)
+
+/*
+ * Document-method: new
+ * call-seq: Iconv.new(to, from, [options])
+ *
+ * Creates new code converter from a coding-system designated with +from+
+ * to another one designated with +to+.
+ * 
+ * === Parameters
+ *
+ * +to+::   encoding name for destination
+ * +from+:: encoding name for source
+ * +options+:: options for converter
+ *
+ * === Exceptions
+ *
+ * TypeError::       if +to+ or +from+ aren't String
+ * InvalidEncoding:: if designated converter couldn't find out
+ * SystemCallError:: if <tt>iconv_open(3)</tt> fails
+ */
+static VALUE
+iconv_initialize(int argc, VALUE *argv, VALUE self)
+{
+    VALUE to, from, options;
+    struct rb_iconv_opt_t opt;
+    int idx;
+
+    rb_scan_args(argc, argv, "21", &to, &from, &options);
+    get_iconv_opt(&opt, options);
+    iconv_free(check_iconv(self));
+    DATA_PTR(self) = NULL;
+    DATA_PTR(self) = (void *)ICONV2VALUE(iconv_create(to, from, &opt, &idx));
+    if (idx >= 0) ENCODING_SET(self, idx);
+    return self;
+}
+
+/*
+ * Document-method: open
+ * call-seq: Iconv.open(to, from) { |iconv| ... }
+ *
+ * Equivalent to Iconv.new except that when it is called with a block, it
+ * yields with the new instance and closes it, and returns the result which
+ * returned from the block.
+ */
+static VALUE
+iconv_s_open(int argc, VALUE *argv, VALUE self)
+{
+    VALUE to, from, options, cd;
+    struct rb_iconv_opt_t opt;
+    int idx;
+
+    rb_scan_args(argc, argv, "21", &to, &from, &options);
+    get_iconv_opt(&opt, options);
+    cd = ICONV2VALUE(iconv_create(to, from, &opt, &idx));
+
+    self = Data_Wrap_Struct(self, NULL, ICONV_FREE, (void *)cd);
+    if (idx >= 0) ENCODING_SET(self, idx);
+
+    if (rb_block_given_p()) {
+	return rb_ensure(rb_yield, self, (VALUE(*)())iconv_finish, self);
+    }
+    else {
+	return self;
+    }
+}
+
+static VALUE
+iconv_s_convert(struct iconv_env_t* env)
+{
+    VALUE last = 0;
+
+    for (; env->argc > 0; --env->argc, ++env->argv) {
+	VALUE s = iconv_convert(env->cd, last = *(env->argv),
+				0, -1, env->toidx, env);
+	env->append(env->ret, s);
+    }
+
+    if (!NIL_P(last)) {
+	VALUE s = iconv_convert(env->cd, Qnil, 0, 0, env->toidx, env);
+	if (RSTRING_LEN(s))
+	    env->append(env->ret, s);
+    }
+
+    return env->ret;
+}
+
+/*
+ * Document-method: Iconv::iconv
+ * call-seq: Iconv.iconv(to, from, *strs)
+ *
+ * Shorthand for
+ *   Iconv.open(to, from) { |cd|
+ *     (strs + [nil]).collect { |s| cd.iconv(s) }
+ *   }
+ *
+ * === Parameters
+ *
+ * <tt>to, from</tt>:: see Iconv.new
+ * <tt>strs</tt>:: strings to be converted
+ *
+ * === Exceptions
+ *
+ * Exceptions thrown by Iconv.new, Iconv.open and Iconv#iconv.
+ */
+static VALUE
+iconv_s_iconv(int argc, VALUE *argv, VALUE self)
+{
+    struct iconv_env_t arg;
+
+    if (argc < 2)		/* needs `to' and `from' arguments at least */
+	rb_raise(rb_eArgError, "wrong number of arguments (%d for %d)", argc, 2);
+
+    arg.argc = argc -= 2;
+    arg.argv = argv + 2;
+    arg.append = rb_ary_push;
+    arg.ret = rb_ary_new2(argc);
+    arg.cd = iconv_create(argv[0], argv[1], NULL, &arg.toidx);
+    return rb_ensure(iconv_s_convert, (VALUE)&arg, iconv_free, ICONV2VALUE(arg.cd));
+}
+
+/*
+ * Document-method: Iconv::conv
+ * call-seq: Iconv.conv(to, from, str)
+ *
+ * Shorthand for
+ *   Iconv.iconv(to, from, str).join
+ * See Iconv.iconv.
+ */
+static VALUE
+iconv_s_conv(VALUE self, VALUE to, VALUE from, VALUE str)
+{
+    struct iconv_env_t arg;
+
+    arg.argc = 1;
+    arg.argv = &str;
+    arg.append = rb_str_append;
+    arg.ret = rb_str_new(0, 0);
+    arg.cd = iconv_create(to, from, NULL, &arg.toidx);
+    return rb_ensure(iconv_s_convert, (VALUE)&arg, iconv_free, ICONV2VALUE(arg.cd));
+}
+
+/*
+ * Document-method: list
+ * call-seq: Iconv.list {|*aliases| ... }
+ *
+ * Iterates each alias sets.
+ */
+
+#ifdef HAVE_ICONVLIST
+struct iconv_name_list
+{
+    unsigned int namescount;
+    const char *const *names;
+    VALUE array;
+};
+
+static VALUE
+list_iconv_i(VALUE ptr)
+{
+    struct iconv_name_list *p = (struct iconv_name_list *)ptr;
+    unsigned int i, namescount = p->namescount;
+    const char *const *names = p->names;
+    VALUE ary = rb_ary_new2(namescount);
+
+    for (i = 0; i < namescount; i++) {
+	rb_ary_push(ary, rb_str_new2(names[i]));
+    }
+    if (p->array) {
+	return rb_ary_push(p->array, ary);
+    }
+    return rb_yield(ary);
+}
+
+static int
+list_iconv(unsigned int namescount, const char *const *names, void *data)
+{
+    int *state = data;
+    struct iconv_name_list list;
+
+    list.namescount = namescount;
+    list.names = names;
+    list.array = ((VALUE *)data)[1];
+    rb_protect(list_iconv_i, (VALUE)&list, state);
+    return *state;
+}
+#endif
+
+static VALUE
+iconv_s_list(void)
+{
+#ifdef HAVE_ICONVLIST
+    int state;
+    VALUE args[2];
+
+    args[1] = rb_block_given_p() ? 0 : rb_ary_new();
+    iconvlist(list_iconv, args);
+    state = *(int *)args;
+    if (state) rb_jump_tag(state);
+    if (args[1]) return args[1];
+#elif defined(HAVE___ICONV_FREE_LIST)
+    char **list;
+    size_t sz, i;
+    VALUE ary;
+
+    if (__iconv_get_list(&list, &sz)) return Qnil;
+
+    ary = rb_ary_new2(sz);
+    for (i = 0; i < sz; i++) {
+	rb_ary_push(ary, rb_str_new2(list[i]));
+    }
+    __iconv_free_list(list, sz);
+
+    if (!rb_block_given_p())
+	return ary;
+    for (i = 0; i < RARRAY_LEN(ary); i++) {
+	rb_yield(RARRAY_PTR(ary)[i]);
+    }
+#else
+    rb_notimplement();
+#endif
+    return Qnil;
+}
+
+/*
+ * Document-method: close
+ *
+ * Finishes conversion.
+ *
+ * After calling this, calling Iconv#iconv will cause an exception, but
+ * multiple calls of #close are guaranteed to end successfully.
+ *
+ * Returns a string containing the byte sequence to change the output buffer to
+ * its initial shift state.
+ */
+static VALUE
+iconv_init_state(VALUE self)
+{
+    iconv_t cd = VALUE2ICONV((VALUE)DATA_PTR(self));
+    DATA_PTR(self) = NULL;
+    return iconv_convert(cd, Qnil, 0, 0, ENCODING_GET(self), NULL);
+}
+
+static VALUE
+iconv_finish(VALUE self)
+{
+    VALUE cd = check_iconv(self);
+
+    if (!cd) return Qnil;
+    return rb_ensure(iconv_init_state, self, iconv_free, cd);
+}
+
+/*
+ * Document-method: Iconv#iconv
+ * call-seq: iconv(str, start=0, length=-1)
+ *
+ * Converts string and returns the result.
+ * * If +str+ is a String, converts <tt>str[start, length]</tt> and returns the converted string.
+ * * If +str+ is +nil+, places converter itself into initial shift state and
+ *   just returns a string containing the byte sequence to change the output
+ *   buffer to its initial shift state.
+ * * Otherwise, raises an exception.
+ *
+ * === Parameters
+ *
+ * str::    string to be converted, or nil
+ * start::  starting offset
+ * length:: conversion length; nil or -1 means whole the string from start
+ *
+ * === Exceptions
+ *
+ * * IconvIllegalSequence
+ * * IconvInvalidCharacter
+ * * IconvOutOfRange
+ *
+ * === Examples
+ *
+ * See the Iconv documentation.
+ */
+static VALUE
+iconv_iconv(int argc, VALUE *argv, VALUE self)
+{
+    VALUE str, n1, n2;
+    VALUE cd = check_iconv(self);
+    long start = 0, length = 0, slen = 0;
+
+    rb_scan_args(argc, argv, "12", &str, &n1, &n2);
+    if (!NIL_P(str)) {
+	VALUE n = rb_str_length(StringValue(str));
+	slen = NUM2LONG(n);
+    }
+    if (argc != 2 || !RTEST(rb_range_beg_len(n1, &start, &length, slen, 0))) {
+	if (NIL_P(n1) || ((start = NUM2LONG(n1)) < 0 ? (start += slen) >= 0 : start < slen)) {
+	    length = NIL_P(n2) ? -1 : NUM2LONG(n2);
+	}
+    }
+    if (start > 0 || length > 0) {
+	rb_encoding *enc = rb_enc_get(str);
+	const char *s = RSTRING_PTR(str), *e = s + RSTRING_LEN(str);
+	const char *ps = s;
+	if (start > 0) {
+	    start = (ps = rb_enc_nth(s, e, start, enc)) - s;
+	}
+	if (length > 0) {
+	    length = rb_enc_nth(ps, e, length, enc) - ps;
+	}
+    }
+
+    return iconv_convert(VALUE2ICONV(cd), str, start, length, ENCODING_GET(self), NULL);
+}
+
+/*
+ * Document-method: conv
+ * call-seq: conv(str...)
+ *
+ * Equivalent to
+ *
+ *   iconv(nil, str..., nil).join
+ */
+static VALUE
+iconv_conv(int argc, VALUE *argv, VALUE self)
+{
+    iconv_t cd = VALUE2ICONV(check_iconv(self));
+    VALUE str, s;
+    int toidx = ENCODING_GET(self);
+
+    str = iconv_convert(cd, Qnil, 0, 0, toidx, NULL);
+    if (argc > 0) {
+	do {
+	    s = iconv_convert(cd, *argv++, 0, -1, toidx, NULL);
+	    if (RSTRING_LEN(s))
+		rb_str_buf_append(str, s);
+	} while (--argc);
+	s = iconv_convert(cd, Qnil, 0, 0, toidx, NULL);
+	if (RSTRING_LEN(s))
+	    rb_str_buf_append(str, s);
+    }
+
+    return str;
+}
+
+/*
+ * Document-method: trivial?
+ * call-seq: trivial?
+ *
+ * Returns trivial flag.
+ */
+static VALUE
+iconv_trivialp(VALUE self)
+{
+#ifdef ICONV_TRIVIALP
+    int trivial = 0;
+    iconv_ctl(self, ICONV_TRIVIALP, trivial);
+    if (trivial) return Qtrue;
+#else
+    rb_notimplement();
+#endif
+    return Qfalse;
+}
+
+/*
+ * Document-method: transliterate?
+ * call-seq: transliterate?
+ *
+ * Returns transliterate flag.
+ */
+static VALUE
+iconv_get_transliterate(VALUE self)
+{
+#ifdef ICONV_GET_TRANSLITERATE
+    int trans = 0;
+    iconv_ctl(self, ICONV_GET_TRANSLITERATE, trans);
+    if (trans) return Qtrue;
+#else
+    rb_notimplement();
+#endif
+    return Qfalse;
+}
+
+/*
+ * Document-method: transliterate=
+ * call-seq: cd.transliterate = flag
+ *
+ * Sets transliterate flag.
+ */
+static VALUE
+iconv_set_transliterate(VALUE self, VALUE transliterate)
+{
+#ifdef ICONV_SET_TRANSLITERATE
+    int trans = RTEST(transliterate);
+    iconv_ctl(self, ICONV_SET_TRANSLITERATE, trans);
+#else
+    rb_notimplement();
+#endif
+    return self;
+}
+
+/*
+ * Document-method: discard_ilseq?
+ * call-seq: discard_ilseq?
+ *
+ * Returns discard_ilseq flag.
+ */
+static VALUE
+iconv_get_discard_ilseq(VALUE self)
+{
+#ifdef ICONV_GET_DISCARD_ILSEQ
+    int dis = 0;
+    iconv_ctl(self, ICONV_GET_DISCARD_ILSEQ, dis);
+    if (dis) return Qtrue;
+#else
+    rb_notimplement();
+#endif
+    return Qfalse;
+}
+
+/*
+ * Document-method: discard_ilseq=
+ * call-seq: cd.discard_ilseq = flag
+ *
+ * Sets discard_ilseq flag.
+ */
+static VALUE
+iconv_set_discard_ilseq(VALUE self, VALUE discard_ilseq)
+{
+#ifdef ICONV_SET_DISCARD_ILSEQ
+    int dis = RTEST(discard_ilseq);
+    iconv_ctl(self, ICONV_SET_DISCARD_ILSEQ, dis);
+#else
+    rb_notimplement();
+#endif
+    return self;
+}
+
+/*
+ * Document-method: ctlmethods
+ * call-seq: Iconv.ctlmethods => array
+ *
+ * Returns available iconvctl() method list.
+ */
+static VALUE
+iconv_s_ctlmethods(VALUE klass)
+{
+    VALUE ary = rb_ary_new();
+#ifdef ICONV_TRIVIALP
+    rb_ary_push(ary, ID2SYM(rb_intern("trivial?")));
+#endif
+#ifdef ICONV_GET_TRANSLITERATE
+    rb_ary_push(ary, ID2SYM(rb_intern("transliterate?")));
+#endif
+#ifdef ICONV_SET_TRANSLITERATE
+    rb_ary_push(ary, ID2SYM(rb_intern("transliterate=")));
+#endif
+#ifdef ICONV_GET_DISCARD_ILSEQ
+    rb_ary_push(ary, ID2SYM(rb_intern("discard_ilseq?")));
+#endif
+#ifdef ICONV_SET_DISCARD_ILSEQ
+    rb_ary_push(ary, ID2SYM(rb_intern("discard_ilseq=")));
+#endif
+    return ary;
+}
+
+/*
+ * Document-class: Iconv::Failure
+ *
+ * Base attributes for Iconv exceptions.
+ */
+
+/*
+ * Document-method: success
+ * call-seq: success
+ *
+ * Returns string(s) translated successfully until the exception occurred.
+ * * In the case of failure occurred within Iconv.iconv, returned
+ *   value is an array of strings translated successfully preceding
+ *   failure and the last element is string on the way.
+ */
+static VALUE
+iconv_failure_success(VALUE self)
+{
+    return rb_attr_get(self, rb_success);
+}
+
+/*
+ * Document-method: failed
+ * call-seq: failed
+ *
+ * Returns substring of the original string passed to Iconv that starts at the
+ * character caused the exception. 
+ */
+static VALUE
+iconv_failure_failed(VALUE self)
+{
+    return rb_attr_get(self, rb_failed);
+}
+
+/*
+ * Document-method: inspect
+ * call-seq: inspect
+ *
+ * Returns inspected string like as: #<_class_: _success_, _failed_>
+ */
+static VALUE
+iconv_failure_inspect(VALUE self)
+{
+    const char *cname = rb_class2name(CLASS_OF(self));
+    VALUE success = rb_attr_get(self, rb_success);
+    VALUE failed = rb_attr_get(self, rb_failed);
+    VALUE str = rb_str_buf_cat2(rb_str_new2("#<"), cname);
+    str = rb_str_buf_cat(str, ": ", 2);
+    str = rb_str_buf_append(str, rb_inspect(success));
+    str = rb_str_buf_cat(str, ", ", 2);
+    str = rb_str_buf_append(str, rb_inspect(failed));
+    return rb_str_buf_cat(str, ">", 1);
+}
+
+/*
+ * Document-class: Iconv::InvalidEncoding
+ * 
+ * Requested coding-system is not available on this system.
+ */
+
+/*
+ * Document-class: Iconv::IllegalSequence
+ * 
+ * Input conversion stopped due to an input byte that does not belong to
+ * the input codeset, or the output codeset does not contain the
+ * character.
+ */
+
+/*
+ * Document-class: Iconv::InvalidCharacter
+ * 
+ * Input conversion stopped due to an incomplete character or shift
+ * sequence at the end of the input buffer.
+ */
+
+/*
+ * Document-class: Iconv::OutOfRange
+ * 
+ * Iconv library internal error.  Must not occur.
+ */
+
+/*
+ * Document-class: Iconv::BrokenLibrary
+ * 
+ * Detected a bug of underlying iconv(3) libray.
+ * * returns an error without setting errno properly
+ */
+
+void
+Init_iconv(void)
+{
+    VALUE rb_cIconv = rb_define_class("Iconv", rb_cData);
+
+    rb_define_alloc_func(rb_cIconv, iconv_s_allocate);
+    rb_define_singleton_method(rb_cIconv, "open", iconv_s_open, -1);
+    rb_define_singleton_method(rb_cIconv, "iconv", iconv_s_iconv, -1);
+    rb_define_singleton_method(rb_cIconv, "conv", iconv_s_conv, 3);
+    rb_define_singleton_method(rb_cIconv, "list", iconv_s_list, 0);
+    rb_define_singleton_method(rb_cIconv, "ctlmethods", iconv_s_ctlmethods, 0);
+    rb_define_method(rb_cIconv, "initialize", iconv_initialize, -1);
+    rb_define_method(rb_cIconv, "close", iconv_finish, 0);
+    rb_define_method(rb_cIconv, "iconv", iconv_iconv, -1);
+    rb_define_method(rb_cIconv, "conv", iconv_conv, -1);
+    rb_define_method(rb_cIconv, "trivial?", iconv_trivialp, 0);
+    rb_define_method(rb_cIconv, "transliterate?", iconv_get_transliterate, 0);
+    rb_define_method(rb_cIconv, "transliterate=", iconv_set_transliterate, 1);
+    rb_define_method(rb_cIconv, "discard_ilseq?", iconv_get_discard_ilseq, 0);
+    rb_define_method(rb_cIconv, "discard_ilseq=", iconv_set_discard_ilseq, 1);
+
+    rb_eIconvFailure = rb_define_module_under(rb_cIconv, "Failure");
+    rb_define_method(rb_eIconvFailure, "initialize", iconv_failure_initialize, 3);
+    rb_define_method(rb_eIconvFailure, "success", iconv_failure_success, 0);
+    rb_define_method(rb_eIconvFailure, "failed", iconv_failure_failed, 0);
+    rb_define_method(rb_eIconvFailure, "inspect", iconv_failure_inspect, 0);
+
+    rb_eIconvInvalidEncoding = rb_define_class_under(rb_cIconv, "InvalidEncoding", rb_eArgError);
+    rb_eIconvIllegalSeq = rb_define_class_under(rb_cIconv, "IllegalSequence", rb_eArgError);
+    rb_eIconvInvalidChar = rb_define_class_under(rb_cIconv, "InvalidCharacter", rb_eArgError);
+    rb_eIconvOutOfRange = rb_define_class_under(rb_cIconv, "OutOfRange", rb_eRuntimeError);
+    rb_eIconvBrokenLibrary = rb_define_class_under(rb_cIconv, "BrokenLibrary", rb_eRuntimeError);
+    rb_include_module(rb_eIconvInvalidEncoding, rb_eIconvFailure);
+    rb_include_module(rb_eIconvIllegalSeq, rb_eIconvFailure);
+    rb_include_module(rb_eIconvInvalidChar, rb_eIconvFailure);
+    rb_include_module(rb_eIconvOutOfRange, rb_eIconvFailure);
+    rb_include_module(rb_eIconvBrokenLibrary, rb_eIconvFailure);
+
+    rb_success = rb_intern("success");
+    rb_failed = rb_intern("failed");
+    id_transliterate = rb_intern("transliterate");
+    id_discard_ilseq = rb_intern("discard_ilseq");
+
+    rb_gc_register_address(&charset_map);
+    charset_map = rb_hash_new();
+    rb_define_singleton_method(rb_cIconv, "charset_map", charset_map_get, 0);
+}
+