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Mon Sep 11 10:03:24 2000 Owen Taylor <otaylor@redhat.com> * glib.h convert.c (g_convert_with_fallback): Change ERROR_OTHER to ERROR_FAILED, add some dummy marking with _(). * docs/reference/glib/glib-sections.txt docs/reference/glib/glib-docs.sgml Update for g_convert, g_unicode_validate.
405 lines
11 KiB
C
405 lines
11 KiB
C
/* GLIB - Library of useful routines for C programming
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*
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* gconvert.c: Convert between character sets using iconv
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* Copyright Red Hat Inc., 2000
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* Authors: Havoc Pennington <hp@redhat.com>, Owen Taylor <otaylor@redhat.com
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <iconv.h>
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#include <errno.h>
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#include <string.h>
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#include "glib.h"
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#define _(s) (s)
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GQuark
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g_convert_error_quark()
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{
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static GQuark quark;
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if (!quark)
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quark = g_quark_from_static_string ("g_convert_error");
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return quark;
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}
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static iconv_t
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open_converter (const gchar *to_codeset,
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const gchar *from_codeset,
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GError **error)
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{
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iconv_t cd = iconv_open (to_codeset, from_codeset);
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if (cd == (iconv_t) -1)
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{
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/* Something went wrong. */
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if (errno == EINVAL)
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g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_NO_CONVERSION,
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_("Conversion from character set `%s' to `%s' is not supported"),
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from_codeset, to_codeset);
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else
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g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_FAILED,
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_("Could not open converter from `%s' to `%s': %s"),
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from_codeset, to_codeset, strerror (errno));
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}
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return cd;
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}
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/**
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* g_convert:
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* @str: the string to convert
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* @len: the length of the string
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* @to_codeset: name of character set into which to convert @str
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* @from_codeset: character set of @str.
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* @bytes_read: location to store the number of bytes in the
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* input string that were successfully converted, or %NULL.
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* Even if the conversion was succesful, this may be
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* less than len if there were partial characters
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* at the end of the input. If the error
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* G_CONVERT_ERROR_ILLEGAL_SEQUENCE occurs, the value
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* stored will the byte fofset after the last valid
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* input sequence.
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* @bytes_written: the stored in the output buffer (not including the
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* terminating nul.
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* @error: location to store the error occuring, or %NULL to ignore
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* errors. Any of the errors in #GConvertError may occur.
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*
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* Convert a string from one character set to another.
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*
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* Return value: If the conversion was successful, a newly allocated
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* NUL-terminated string, which must be freed with
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* g_free. Otherwise %NULL and @error will be set.
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**/
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gchar*
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g_convert (const gchar *str,
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gint len,
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const gchar *to_codeset,
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const gchar *from_codeset,
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gint *bytes_read,
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gint *bytes_written,
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GError **error)
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{
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gchar *dest;
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gchar *outp;
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const gchar *p;
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size_t inbytes_remaining;
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size_t outbytes_remaining;
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size_t err;
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iconv_t cd;
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size_t outbuf_size;
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gboolean have_error = FALSE;
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g_return_val_if_fail (str != NULL, NULL);
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g_return_val_if_fail (to_codeset != NULL, NULL);
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g_return_val_if_fail (from_codeset != NULL, NULL);
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cd = open_converter (to_codeset, from_codeset, error);
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if (cd == (iconv_t) -1)
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{
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if (bytes_read)
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*bytes_read = 0;
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if (bytes_written)
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*bytes_written = 0;
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return NULL;
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}
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if (len < 0)
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len = strlen (str);
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p = str;
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inbytes_remaining = len;
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outbuf_size = len + 1; /* + 1 for nul in case len == 1 */
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outbytes_remaining = outbuf_size - 1; /* -1 for nul */
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outp = dest = g_malloc (outbuf_size);
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again:
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err = iconv (cd, &p, &inbytes_remaining, &outp, &outbytes_remaining);
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if (err == (size_t) -1)
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{
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switch (errno)
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{
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case EINVAL:
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/* Incomplete text, do not report an error */
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break;
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case E2BIG:
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{
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size_t used = outp - dest;
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outbuf_size *= 2;
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dest = g_realloc (dest, outbuf_size);
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outp = dest + used;
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outbytes_remaining = outbuf_size - used - 1; /* -1 for nul */
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goto again;
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}
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case EILSEQ:
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g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_ILLEGAL_SEQUENCE,
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_("Invalid byte sequence in conversion input"));
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have_error = TRUE;
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break;
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default:
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g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_FAILED,
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_("Error during conversion: %s"),
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strerror (errno));
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have_error = TRUE;
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break;
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}
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}
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*outp = '\0';
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iconv_close (cd);
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if (bytes_read)
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*bytes_read = p - str;
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if (bytes_written)
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*bytes_written = outp - dest; /* Doesn't include '\0' */
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if (have_error)
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{
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g_free (dest);
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return NULL;
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}
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else
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return dest;
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}
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/**
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* g_convert_with_fallback:
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* @str: the string to convert
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* @len: the length of the string
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* @to_codeset: name of character set into which to convert @str
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* @from_codeset: character set of @str.
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* @fallback: UTF-8 string to use in place of character not
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* present in the target encoding. (This must be
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* in the target encoding), if %NULL, characters
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* not in the target encoding will be represented
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* as Unicode escapes \x{XXXX} or \x{XXXXXX}.
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* @bytes_read: location to store the number of bytes in the
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* input string that were successfully converted, or %NULL.
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* Even if the conversion was succesful, this may be
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* less than len if there were partial characters
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* at the end of the input. If the error
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* G_CONVERT_ERROR_ILLEGAL_SEQUENCE occurs, the value
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* stored will the byte fofset after the last valid
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* input sequence.
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* @bytes_written: the stored in the output buffer (not including the
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* terminating nul.
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* @error: location to store the error occuring, or %NULL to ignore
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* errors. Any of the errors in #GConvertError may occur.
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*
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* Convert a string from one character set to another, possibly
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* including fallback sequences for characters not representable
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* in the output. Note that it is not guaranteed that the specification
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* for the fallback sequences in @fallback will be honored. Some
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* systems may do a approximate conversion from @from_codeset
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* to @to_codeset in their iconv() functions, in which case GLib
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* will simply return that approximate conversion.
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*
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* Return value: If the conversion was successful, a newly allocated
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* NUL-terminated string, which must be freed with
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* g_free. Otherwise %NULL and @error will be set.
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**/
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gchar*
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g_convert_with_fallback (const gchar *str,
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gint len,
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const gchar *to_codeset,
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const gchar *from_codeset,
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gchar *fallback,
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gint *bytes_read,
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gint *bytes_written,
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GError **error)
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{
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gchar *utf8;
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gchar *dest;
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gchar *outp;
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const gchar *insert_str = NULL;
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const gchar *p;
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int inbytes_remaining;
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const gchar *save_p = NULL;
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size_t save_inbytes = 0;
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size_t outbytes_remaining;
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size_t err;
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iconv_t cd;
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size_t outbuf_size;
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gboolean have_error = FALSE;
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gboolean done = FALSE;
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GError *local_error = NULL;
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g_return_val_if_fail (str != NULL, NULL);
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g_return_val_if_fail (to_codeset != NULL, NULL);
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g_return_val_if_fail (from_codeset != NULL, NULL);
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if (len < 0)
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len = strlen (str);
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/* Try an exact conversion; we only proceed if this fails
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* due to an illegal sequence in the input string.
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*/
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dest = g_convert (str, len, to_codeset, from_codeset,
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bytes_read, bytes_written, &local_error);
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if (!local_error)
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return dest;
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if (!g_error_matches (local_error, G_CONVERT_ERROR, G_CONVERT_ERROR_ILLEGAL_SEQUENCE))
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{
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g_propagate_error (error, local_error);
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return NULL;
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}
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else
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g_error_free (local_error);
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/* No go; to proceed, we need a converter from "UTF-8" to
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* to_codeset, and the string as UTF-8.
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*/
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cd = open_converter (to_codeset, "UTF-8", error);
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if (cd == (iconv_t) -1)
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{
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if (bytes_read)
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*bytes_read = 0;
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if (bytes_written)
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*bytes_written = 0;
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return NULL;
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}
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utf8 = g_convert (str, len, "UTF-8", from_codeset,
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bytes_read, &inbytes_remaining, error);
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if (!utf8)
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return NULL;
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/* Now the heart of the code. We loop through the UTF-8 string, and
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* whenever we hit an offending character, we form fallback, convert
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* the fallback to the target codeset, and then go back to
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* converting the original string after finishing with the fallback.
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*
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* The variables save_p and save_inbytes store the input state
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* for the original string while we are converting the fallback
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*/
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p = utf8;
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outbuf_size = len + 1; /* + 1 for nul in case len == 1 */
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outbytes_remaining = outbuf_size - 1; /* -1 for nul */
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outp = dest = g_malloc (outbuf_size);
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while (!done && !have_error)
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{
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size_t inbytes_tmp = inbytes_remaining;
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err = iconv (cd, &p, &inbytes_tmp, &outp, &outbytes_remaining);
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inbytes_remaining = inbytes_tmp;
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if (err == (size_t) -1)
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{
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switch (errno)
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{
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case EINVAL:
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g_assert_not_reached();
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break;
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case E2BIG:
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{
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size_t used = outp - dest;
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outbuf_size *= 2;
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dest = g_realloc (dest, outbuf_size);
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outp = dest + used;
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outbytes_remaining = outbuf_size - used - 1; /* -1 for nul */
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break;
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}
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case EILSEQ:
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if (save_p)
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{
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/* Error converting fallback string - fatal
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*/
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g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_ILLEGAL_SEQUENCE,
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_("Cannot convert fallback '%s' to codeset '%s'"),
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insert_str, to_codeset);
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have_error = TRUE;
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break;
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}
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else
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{
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if (!fallback)
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{
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gunichar ch = g_utf8_get_char (p);
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insert_str = g_strdup_printf ("\\x{%0*X}",
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(ch < 0x10000) ? 4 : 6,
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ch);
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}
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else
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insert_str = fallback;
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save_p = g_utf8_next_char (p);
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save_inbytes = inbytes_remaining - (save_p - p);
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p = insert_str;
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inbytes_remaining = strlen (p);
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}
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break;
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default:
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g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_FAILED,
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_("Error during conversion: %s"),
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strerror (errno));
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have_error = TRUE;
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break;
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}
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}
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else
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{
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if (save_p)
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{
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if (!fallback)
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g_free ((gchar *)insert_str);
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p = save_p;
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inbytes_remaining = save_inbytes;
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save_p = NULL;
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}
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else
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done = TRUE;
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}
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}
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/* Cleanup
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*/
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*outp = '\0';
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iconv_close (cd);
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if (bytes_written)
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*bytes_written = outp - str; /* Doesn't include '\0' */
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g_free (utf8);
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if (have_error)
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{
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if (save_p && !fallback)
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g_free ((gchar *)insert_str);
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g_free (dest);
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return NULL;
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}
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else
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return dest;
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}
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