/* Unicode character output to streams with locale dependent encoding.
- Copyright (C) 2000 Free Software Foundation, Inc.
+ Copyright (C) 2000-2003, 2006 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify it
- under the terms of the GNU Library General Public License as published
- by the Free Software Foundation; either version 2, or (at your option)
- any later version.
+ 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 3 of the License, 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
- Library General Public License for more details.
+ 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 Library General Public
- License along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
- USA. */
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <haible@clisp.cons.org>. */
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
+/* Note: This file requires the locale_charset() function. See in
+ libiconv-1.8/libcharset/INTEGRATE for how to obtain it. */
-#if HAVE_STDDEF_H
-# include <stddef.h>
-#endif
+#include <config.h>
-#include <stdio.h>
+/* Specification. */
+#include "unicodeio.h"
+#include <stdio.h>
+#include <string.h>
#include <errno.h>
-#ifndef errno
-extern int errno;
-#endif
#if HAVE_ICONV
# include <iconv.h>
-/* Name of UCS-4 encoding with machine dependent endianness and alignment. */
-# ifdef _LIBICONV_VERSION
-# define UCS4_NAME "UCS-4-INTERNAL"
-# else
-# define UCS4_NAME "INTERNAL"
-# endif
#endif
#include <error.h>
-#if ENABLE_NLS
-# include <libintl.h>
-# define _(Text) gettext (Text)
-#else
-# define _(Text) Text
-#endif
+#include "gettext.h"
+#define _(msgid) gettext (msgid)
+#define N_(msgid) msgid
+
+#include "localcharset.h"
+
+/* When we pass a Unicode character to iconv(), we must pass it in a
+ suitable encoding. The standardized Unicode encodings are
+ UTF-8, UCS-2, UCS-4, UTF-16, UTF-16BE, UTF-16LE, UTF-7.
+ UCS-2 supports only characters up to \U0000FFFF.
+ UTF-16 and variants support only characters up to \U0010FFFF.
+ UTF-7 is way too complex and not supported by glibc-2.1.
+ UCS-4 specification leaves doubts about endianness and byte order
+ mark. glibc currently interprets it as big endian without byte order
+ mark, but this is not backed by an RFC.
+ So we use UTF-8. It supports characters up to \U7FFFFFFF and is
+ unambiguously defined. */
+
+/* Stores the UTF-8 representation of the Unicode character wc in r[0..5].
+ Returns the number of bytes stored, or -1 if wc is out of range. */
+static int
+utf8_wctomb (unsigned char *r, unsigned int wc)
+{
+ int count;
+
+ if (wc < 0x80)
+ count = 1;
+ else if (wc < 0x800)
+ count = 2;
+ else if (wc < 0x10000)
+ count = 3;
+ else if (wc < 0x200000)
+ count = 4;
+ else if (wc < 0x4000000)
+ count = 5;
+ else if (wc <= 0x7fffffff)
+ count = 6;
+ else
+ return -1;
+
+ switch (count)
+ {
+ /* Note: code falls through cases! */
+ case 6: r[5] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0x4000000;
+ case 5: r[4] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0x200000;
+ case 4: r[3] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0x10000;
+ case 3: r[2] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0x800;
+ case 2: r[1] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0xc0;
+ case 1: r[0] = wc;
+ }
-#include "unicodeio.h"
+ return count;
+}
-/* Use md5.h for its nice detection of unsigned 32-bit type. */
-#include "md5.h"
-#undef uint32_t
-#define uint32_t md5_uint32
+/* Luckily, the encoding's name is platform independent. */
+#define UTF8_NAME "UTF-8"
-/* Outputs the Unicode character CODE to the output stream STREAM.
+/* Converts the Unicode character CODE to its multibyte representation
+ in the current locale and calls the SUCCESS callback on the resulting
+ byte sequence. If an error occurs, invokes the FAILURE callback instead,
+ passing it CODE and an English error string.
+ Returns whatever the callback returned.
Assumes that the locale doesn't change between two calls. */
-void
-print_unicode_char (FILE *stream, unsigned int code)
+long
+unicode_to_mb (unsigned int code,
+ long (*success) (const char *buf, size_t buflen,
+ void *callback_arg),
+ long (*failure) (unsigned int code, const char *msg,
+ void *callback_arg),
+ void *callback_arg)
{
-#if HAVE_ICONV
static int initialized;
- static iconv_t ucs4_to_local;
+ static int is_utf8;
+#if HAVE_ICONV
+ static iconv_t utf8_to_local;
+#endif
- uint32_t in;
- char outbuf[25];
- const char *inptr;
- size_t inbytesleft;
- char *outptr;
- size_t outbytesleft;
- size_t res;
+ char inbuf[6];
+ int count;
if (!initialized)
{
- extern const char *locale_charset (void);
const char *charset = locale_charset ();
- ucs4_to_local = (charset != NULL
- ? iconv_open (charset, UCS4_NAME)
- : (iconv_t)(-1));
- if (ucs4_to_local == (iconv_t)(-1))
+ is_utf8 = !strcmp (charset, UTF8_NAME);
+#if HAVE_ICONV
+ if (!is_utf8)
{
- /* For an unknown encoding, assume ASCII. */
- ucs4_to_local = iconv_open ("ASCII", UCS4_NAME);
- if (ucs4_to_local == (iconv_t)(-1))
- error (1, 0, _("cannot output U+%04X: iconv function not usable"),
- code);
+ utf8_to_local = iconv_open (charset, UTF8_NAME);
+ if (utf8_to_local == (iconv_t)(-1))
+ /* For an unknown encoding, assume ASCII. */
+ utf8_to_local = iconv_open ("ASCII", UTF8_NAME);
}
+#endif
initialized = 1;
}
- in = code;
- inptr = (char *) ∈
- inbytesleft = sizeof (in);
- outptr = outbuf;
- outbytesleft = sizeof (outbuf);
+ /* Test whether the utf8_to_local converter is available at all. */
+ if (!is_utf8)
+ {
+#if HAVE_ICONV
+ if (utf8_to_local == (iconv_t)(-1))
+ return failure (code, N_("iconv function not usable"), callback_arg);
+#else
+ return failure (code, N_("iconv function not available"), callback_arg);
+#endif
+ }
- /* Convert the character. */
- res = iconv (ucs4_to_local, &inptr, &inbytesleft, &outptr, &outbytesleft);
- if (inbytesleft > 0 || res == (size_t)(-1))
- error (1, res == (size_t)(-1) ? errno : 0,
- _("cannot convert U+%04X to local character set"), code);
+ /* Convert the character to UTF-8. */
+ count = utf8_wctomb ((unsigned char *) inbuf, code);
+ if (count < 0)
+ return failure (code, N_("character out of range"), callback_arg);
- /* Avoid glibc-2.1 bug. */
-# if defined _LIBICONV_VERSION || !(__GLIBC__ - 0 == 2 && __GLIBC_MINOR__ - 0 <= 1)
+#if HAVE_ICONV
+ if (!is_utf8)
+ {
+ char outbuf[25];
+ const char *inptr;
+ size_t inbytesleft;
+ char *outptr;
+ size_t outbytesleft;
+ size_t res;
+
+ inptr = inbuf;
+ inbytesleft = count;
+ outptr = outbuf;
+ outbytesleft = sizeof (outbuf);
+
+ /* Convert the character from UTF-8 to the locale's charset. */
+ res = iconv (utf8_to_local,
+ (ICONV_CONST char **)&inptr, &inbytesleft,
+ &outptr, &outbytesleft);
+ if (inbytesleft > 0 || res == (size_t)(-1)
+ /* Irix iconv() inserts a NUL byte if it cannot convert. */
+# if !defined _LIBICONV_VERSION && (defined sgi || defined __sgi)
+ || (res > 0 && code != 0 && outptr - outbuf == 1 && *outbuf == '\0')
+# endif
+ )
+ return failure (code, NULL, callback_arg);
- /* Get back to the initial shift state. */
- res = iconv (ucs4_to_local, NULL, NULL, &outptr, &outbytesleft);
- if (res == (size_t)(-1))
- error (1, errno, _("cannot convert U+%04X to local character set"), code);
+ /* Avoid glibc-2.1 bug and Solaris 7 bug. */
+# if defined _LIBICONV_VERSION \
+ || !((__GLIBC__ - 0 == 2 && __GLIBC_MINOR__ - 0 <= 1) || defined __sun)
+ /* Get back to the initial shift state. */
+ res = iconv (utf8_to_local, NULL, NULL, &outptr, &outbytesleft);
+ if (res == (size_t)(-1))
+ return failure (code, NULL, callback_arg);
# endif
- fwrite (outbuf, 1, outptr - outbuf, stream);
-
-#else
- error (1, 0, _("cannot output U+%04X: iconv function not available"), code);
+ return success (outbuf, outptr - outbuf, callback_arg);
+ }
#endif
+
+ /* At this point, is_utf8 is true, so no conversion is needed. */
+ return success (inbuf, count, callback_arg);
+}
+
+/* Simple success callback that outputs the converted string.
+ The STREAM is passed as callback_arg. */
+long
+fwrite_success_callback (const char *buf, size_t buflen, void *callback_arg)
+{
+ FILE *stream = (FILE *) callback_arg;
+
+ fwrite (buf, 1, buflen, stream);
+ return 0;
+}
+
+/* Simple failure callback that displays an error and exits. */
+static long
+exit_failure_callback (unsigned int code, const char *msg, void *callback_arg)
+{
+ if (msg == NULL)
+ error (1, 0, _("cannot convert U+%04X to local character set"), code);
+ else
+ error (1, 0, _("cannot convert U+%04X to local character set: %s"), code,
+ gettext (msg));
+ return -1;
+}
+
+/* Simple failure callback that displays a fallback representation in plain
+ ASCII, using the same notation as ISO C99 strings. */
+static long
+fallback_failure_callback (unsigned int code, const char *msg, void *callback_arg)
+{
+ FILE *stream = (FILE *) callback_arg;
+
+ if (code < 0x10000)
+ fprintf (stream, "\\u%04X", code);
+ else
+ fprintf (stream, "\\U%08X", code);
+ return -1;
+}
+
+/* Outputs the Unicode character CODE to the output stream STREAM.
+ Upon failure, exit if exit_on_error is true, otherwise output a fallback
+ notation. */
+void
+print_unicode_char (FILE *stream, unsigned int code, int exit_on_error)
+{
+ unicode_to_mb (code, fwrite_success_callback,
+ exit_on_error
+ ? exit_failure_callback
+ : fallback_failure_callback,
+ stream);
}
projects / gnulib.git / blobdiff