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glib/glib/gconvert.c
Thiago Santos 79f930f6dc gconvert: mention that the g_convert len should be in bytes 
Some charsets have each char with more than one byte, make it clear that
the length should be in bytes

https://bugzilla.gnome.org/show_bug.cgi?id=730963
2014-05-30 13:51:16 +02:00

1943 lines
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/* GLIB - Library of useful routines for C programming
*
* gconvert.c: Convert between character sets using iconv
* Copyright Red Hat Inc., 2000
* Authors: Havoc Pennington <hp@redhat.com>, Owen Taylor <otaylor@redhat.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "glibconfig.h"
#ifndef G_OS_WIN32
#include <iconv.h>
#endif
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#ifdef G_OS_WIN32
#include "win_iconv.c"
#endif
#ifdef G_PLATFORM_WIN32
#define STRICT
#include <windows.h>
#undef STRICT
#endif
#include "gconvert.h"
#include "gcharsetprivate.h"
#include "gslist.h"
#include "gstrfuncs.h"
#include "gtestutils.h"
#include "gthread.h"
#include "gunicode.h"
#include "gfileutils.h"
#include "glibintl.h"
#if defined(USE_LIBICONV_GNU) && !defined (_LIBICONV_H)
#error GNU libiconv in use but included iconv.h not from libiconv
#endif
#if !defined(USE_LIBICONV_GNU) && defined (_LIBICONV_H) \
&& !defined (__APPLE_CC__) && !defined (__LP_64__)
#error GNU libiconv not in use but included iconv.h is from libiconv
#endif
/**
* SECTION:conversions
* @title: Character Set Conversion
* @short_description: convert strings between different character sets
*
* The g_convert() family of function wraps the functionality of iconv().
* In addition to pure character set conversions, GLib has functions to
* deal with the extra complications of encodings for file names.
*
* ## File Name Encodings
*
* Historically, UNIX has not had a defined encoding for file names:
* a file name is valid as long as it does not have path separators
* in it ("/"). However, displaying file names may require conversion:
* from the character set in which they were created, to the character
* set in which the application operates. Consider the Spanish file name
* "Presentaci&oacute;n.sxi". If the application which created it uses
* ISO-8859-1 for its encoding,
* |[
* Character: P r e s e n t a c i &oacute; n . s x i
* Hex code: 50 72 65 73 65 6e 74 61 63 69 f3 6e 2e 73 78 69
* ]|
* However, if the application use UTF-8, the actual file name on
* disk would look like this:
* |[
* Character: P r e s e n t a c i &oacute; n . s x i
* Hex code: 50 72 65 73 65 6e 74 61 63 69 c3 b3 6e 2e 73 78 69
* ]|
* Glib uses UTF-8 for its strings, and GUI toolkits like GTK+ that use
* Glib do the same thing. If you get a file name from the file system,
* for example, from readdir() or from g_dir_read_name(), and you wish
* to display the file name to the user, you will need to convert it
* into UTF-8. The opposite case is when the user types the name of a
* file he wishes to save: the toolkit will give you that string in
* UTF-8 encoding, and you will need to convert it to the character
* set used for file names before you can create the file with open()
* or fopen().
*
* By default, Glib assumes that file names on disk are in UTF-8
* encoding. This is a valid assumption for file systems which
* were created relatively recently: most applications use UTF-8
* encoding for their strings, and that is also what they use for
* the file names they create. However, older file systems may
* still contain file names created in "older" encodings, such as
* ISO-8859-1. In this case, for compatibility reasons, you may want
* to instruct Glib to use that particular encoding for file names
* rather than UTF-8. You can do this by specifying the encoding for
* file names in the [`G_FILENAME_ENCODING`][G_FILENAME_ENCODING]
* environment variable. For example, if your installation uses
* ISO-8859-1 for file names, you can put this in your `~/.profile`
* |[
* export G_FILENAME_ENCODING=ISO-8859-1
* ]|
* Glib provides the functions g_filename_to_utf8() and
* g_filename_from_utf8() to perform the necessary conversions.
* These functions convert file names from the encoding specified
* in `G_FILENAME_ENCODING` to UTF-8 and vice-versa. This
* [diagram][file-name-encodings-diagram] illustrates how
* these functions are used to convert between UTF-8 and the
* encoding for file names in the file system.
*
* ## Conversion between file name encodings # {#file-name-encodings-diagram)
*
* ![](file-name-encodings.png)
*
* ## Checklist for Application Writers
*
* This section is a practical summary of the detailed
* things to do to make sure your applications process file
* name encodings correctly.
*
* 1. If you get a file name from the file system from a function
* such as readdir() or gtk_file_chooser_get_filename(), you do
* not need to do any conversion to pass that file name to
* functions like open(), rename(), or fopen() -- those are "raw"
* file names which the file system understands.
*
* 2. If you need to display a file name, convert it to UTF-8 first
* by using g_filename_to_utf8(). If conversion fails, display a
* string like "Unknown file name". Do not convert this string back
* into the encoding used for file names if you wish to pass it to
* the file system; use the original file name instead.
*
* For example, the document window of a word processor could display
* "Unknown file name" in its title bar but still let the user save
* the file, as it would keep the raw file name internally. This
* can happen if the user has not set the `G_FILENAME_ENCODING`
* environment variable even though he has files whose names are
* not encoded in UTF-8.
*
* 3. If your user interface lets the user type a file name for saving
* or renaming, convert it to the encoding used for file names in
* the file system by using g_filename_from_utf8(). Pass the converted
* file name to functions like fopen(). If conversion fails, ask the
* user to enter a different file name. This can happen if the user
* types Japanese characters when `G_FILENAME_ENCODING` is set to
* `ISO-8859-1`, for example.
*/
/* We try to terminate strings in unknown charsets with this many zero bytes
* to ensure that multibyte strings really are nul-terminated when we return
* them from g_convert() and friends.
*/
#define NUL_TERMINATOR_LENGTH 4
G_DEFINE_QUARK (g_convert_error, g_convert_error)
static gboolean
try_conversion (const char *to_codeset,
const char *from_codeset,
iconv_t *cd)
{
*cd = iconv_open (to_codeset, from_codeset);
if (*cd == (iconv_t)-1 && errno == EINVAL)
return FALSE;
else
return TRUE;
}
static gboolean
try_to_aliases (const char **to_aliases,
const char *from_codeset,
iconv_t *cd)
{
if (to_aliases)
{
const char **p = to_aliases;
while (*p)
{
if (try_conversion (*p, from_codeset, cd))
return TRUE;
p++;
}
}
return FALSE;
}
/**
* g_iconv_open:
* @to_codeset: destination codeset
* @from_codeset: source codeset
*
* Same as the standard UNIX routine iconv_open(), but
* may be implemented via libiconv on UNIX flavors that lack
* a native implementation.
*
* GLib provides g_convert() and g_locale_to_utf8() which are likely
* more convenient than the raw iconv wrappers.
*
* Returns: a "conversion descriptor", or (GIConv)-1 if
* opening the converter failed.
**/
GIConv
g_iconv_open (const gchar *to_codeset,
const gchar *from_codeset)
{
iconv_t cd;
if (!try_conversion (to_codeset, from_codeset, &cd))
{
const char **to_aliases = _g_charset_get_aliases (to_codeset);
const char **from_aliases = _g_charset_get_aliases (from_codeset);
if (from_aliases)
{
const char **p = from_aliases;
while (*p)
{
if (try_conversion (to_codeset, *p, &cd))
goto out;
if (try_to_aliases (to_aliases, *p, &cd))
goto out;
p++;
}
}
if (try_to_aliases (to_aliases, from_codeset, &cd))
goto out;
}
out:
return (cd == (iconv_t)-1) ? (GIConv)-1 : (GIConv)cd;
}
/**
* g_iconv:
* @converter: conversion descriptor from g_iconv_open()
* @inbuf: bytes to convert
* @inbytes_left: inout parameter, bytes remaining to convert in @inbuf
* @outbuf: converted output bytes
* @outbytes_left: inout parameter, bytes available to fill in @outbuf
*
* Same as the standard UNIX routine iconv(), but
* may be implemented via libiconv on UNIX flavors that lack
* a native implementation.
*
* GLib provides g_convert() and g_locale_to_utf8() which are likely
* more convenient than the raw iconv wrappers.
*
* Returns: count of non-reversible conversions, or -1 on error
**/
gsize
g_iconv (GIConv converter,
gchar **inbuf,
gsize *inbytes_left,
gchar **outbuf,
gsize *outbytes_left)
{
iconv_t cd = (iconv_t)converter;
return iconv (cd, inbuf, inbytes_left, outbuf, outbytes_left);
}
/**
* g_iconv_close:
* @converter: a conversion descriptor from g_iconv_open()
*
* Same as the standard UNIX routine iconv_close(), but
* may be implemented via libiconv on UNIX flavors that lack
* a native implementation. Should be called to clean up
* the conversion descriptor from g_iconv_open() when
* you are done converting things.
*
* GLib provides g_convert() and g_locale_to_utf8() which are likely
* more convenient than the raw iconv wrappers.
*
* Returns: -1 on error, 0 on success
**/
gint
g_iconv_close (GIConv converter)
{
iconv_t cd = (iconv_t)converter;
return iconv_close (cd);
}
static GIConv
open_converter (const gchar *to_codeset,
const gchar *from_codeset,
GError **error)
{
GIConv cd;
cd = g_iconv_open (to_codeset, from_codeset);
if (cd == (GIConv) -1)
{
/* Something went wrong. */
if (error)
{
if (errno == EINVAL)
g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_NO_CONVERSION,
_("Conversion from character set '%s' to '%s' is not supported"),
from_codeset, to_codeset);
else
g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_FAILED,
_("Could not open converter from '%s' to '%s'"),
from_codeset, to_codeset);
}
}
return cd;
}
static int
close_converter (GIConv cd)
{
if (cd == (GIConv) -1)
return 0;
return g_iconv_close (cd);
}
/**
* g_convert_with_iconv:
* @str: the string to convert
* @len: the length of the string in bytes, or -1 if the string is
* nul-terminated (Note that some encodings may allow nul
* bytes to occur inside strings. In that case, using -1
* for the @len parameter is unsafe)
* @converter: conversion descriptor from g_iconv_open()
* @bytes_read: location to store the number of bytes in the
* input string that were successfully converted, or %NULL.
* Even if the conversion was successful, this may be
* less than @len if there were partial characters
* at the end of the input. If the error
* #G_CONVERT_ERROR_ILLEGAL_SEQUENCE occurs, the value
* stored will the byte offset after the last valid
* input sequence.
* @bytes_written: the number of bytes stored in the output buffer (not
* including the terminating nul).
* @error: location to store the error occurring, or %NULL to ignore
* errors. Any of the errors in #GConvertError may occur.
*
* Converts a string from one character set to another.
*
* Note that you should use g_iconv() for streaming conversions.
* Despite the fact that @byes_read can return information about partial
* characters, the g_convert_... functions are not generally suitable
* for streaming. If the underlying converter maintains internal state,
* then this won't be preserved across successive calls to g_convert(),
* g_convert_with_iconv() or g_convert_with_fallback(). (An example of
* this is the GNU C converter for CP1255 which does not emit a base
* character until it knows that the next character is not a mark that
* could combine with the base character.)
*
* Returns: If the conversion was successful, a newly allocated
* nul-terminated string, which must be freed with
* g_free(). Otherwise %NULL and @error will be set.
**/
gchar*
g_convert_with_iconv (const gchar *str,
gssize len,
GIConv converter,
gsize *bytes_read,
gsize *bytes_written,
GError **error)
{
gchar *dest;
gchar *outp;
const gchar *p;
gsize inbytes_remaining;
gsize outbytes_remaining;
gsize err;
gsize outbuf_size;
gboolean have_error = FALSE;
gboolean done = FALSE;
gboolean reset = FALSE;
g_return_val_if_fail (converter != (GIConv) -1, NULL);
if (len < 0)
len = strlen (str);
p = str;
inbytes_remaining = len;
outbuf_size = len + NUL_TERMINATOR_LENGTH;
outbytes_remaining = outbuf_size - NUL_TERMINATOR_LENGTH;
outp = dest = g_malloc (outbuf_size);
while (!done && !have_error)
{
if (reset)
err = g_iconv (converter, NULL, &inbytes_remaining, &outp, &outbytes_remaining);
else
err = g_iconv (converter, (char **)&p, &inbytes_remaining, &outp, &outbytes_remaining);
if (err == (gsize) -1)
{
switch (errno)
{
case EINVAL:
/* Incomplete text, do not report an error */
done = TRUE;
break;
case E2BIG:
{
gsize used = outp - dest;
outbuf_size *= 2;
dest = g_realloc (dest, outbuf_size);
outp = dest + used;
outbytes_remaining = outbuf_size - used - NUL_TERMINATOR_LENGTH;
}
break;
case EILSEQ:
g_set_error_literal (error, G_CONVERT_ERROR, G_CONVERT_ERROR_ILLEGAL_SEQUENCE,
_("Invalid byte sequence in conversion input"));
have_error = TRUE;
break;
default:
{
int errsv = errno;
g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_FAILED,
_("Error during conversion: %s"),
g_strerror (errsv));
}
have_error = TRUE;
break;
}
}
else
{
if (!reset)
{
/* call g_iconv with NULL inbuf to cleanup shift state */
reset = TRUE;
inbytes_remaining = 0;
}
else
done = TRUE;
}
}
memset (outp, 0, NUL_TERMINATOR_LENGTH);
if (bytes_read)
*bytes_read = p - str;
else
{
if ((p - str) != len)
{
if (!have_error)
{
g_set_error_literal (error, G_CONVERT_ERROR, G_CONVERT_ERROR_PARTIAL_INPUT,
_("Partial character sequence at end of input"));
have_error = TRUE;
}
}
}
if (bytes_written)
*bytes_written = outp - dest; /* Doesn't include '\0' */
if (have_error)
{
g_free (dest);
return NULL;
}
else
return dest;
}
/**
* g_convert:
* @str: the string to convert
* @len: the length of the string in bytes, or -1 if the string is
* nul-terminated (Note that some encodings may allow nul
* bytes to occur inside strings. In that case, using -1
* for the @len parameter is unsafe)
* @to_codeset: name of character set into which to convert @str
* @from_codeset: character set of @str.
* @bytes_read: (out): location to store the number of bytes in the
* input string that were successfully converted, or %NULL.
* Even if the conversion was successful, this may be
* less than @len if there were partial characters
* at the end of the input. If the error
* #G_CONVERT_ERROR_ILLEGAL_SEQUENCE occurs, the value
* stored will the byte offset after the last valid
* input sequence.
* @bytes_written: (out): the number of bytes stored in the output buffer (not
* including the terminating nul).
* @error: location to store the error occurring, or %NULL to ignore
* errors. Any of the errors in #GConvertError may occur.
*
* Converts a string from one character set to another.
*
* Note that you should use g_iconv() for streaming conversions.
* Despite the fact that @byes_read can return information about partial
* characters, the g_convert_... functions are not generally suitable
* for streaming. If the underlying converter maintains internal state,
* then this won't be preserved across successive calls to g_convert(),
* g_convert_with_iconv() or g_convert_with_fallback(). (An example of
* this is the GNU C converter for CP1255 which does not emit a base
* character until it knows that the next character is not a mark that
* could combine with the base character.)
*
* Using extensions such as "//TRANSLIT" may not work (or may not work
* well) on many platforms. Consider using g_str_to_ascii() instead.
*
* Returns: If the conversion was successful, a newly allocated
* nul-terminated string, which must be freed with
* g_free(). Otherwise %NULL and @error will be set.
**/
gchar*
g_convert (const gchar *str,
gssize len,
const gchar *to_codeset,
const gchar *from_codeset,
gsize *bytes_read,
gsize *bytes_written,
GError **error)
{
gchar *res;
GIConv cd;
g_return_val_if_fail (str != NULL, NULL);
g_return_val_if_fail (to_codeset != NULL, NULL);
g_return_val_if_fail (from_codeset != NULL, NULL);
cd = open_converter (to_codeset, from_codeset, error);
if (cd == (GIConv) -1)
{
if (bytes_read)
*bytes_read = 0;
if (bytes_written)
*bytes_written = 0;
return NULL;
}
res = g_convert_with_iconv (str, len, cd,
bytes_read, bytes_written,
error);
close_converter (cd);
return res;
}
/**
* g_convert_with_fallback:
* @str: the string to convert
* @len: the length of the string in bytes, or -1 if the string is
* nul-terminated (Note that some encodings may allow nul
* bytes to occur inside strings. In that case, using -1
* for the @len parameter is unsafe)
* @to_codeset: name of character set into which to convert @str
* @from_codeset: character set of @str.
* @fallback: UTF-8 string to use in place of character not
* present in the target encoding. (The string must be
* representable in the target encoding).
If %NULL, characters not in the target encoding will
be represented as Unicode escapes \uxxxx or \Uxxxxyyyy.
* @bytes_read: location to store the number of bytes in the
* input string that were successfully converted, or %NULL.
* Even if the conversion was successful, this may be
* less than @len if there were partial characters
* at the end of the input.
* @bytes_written: the number of bytes stored in the output buffer (not
* including the terminating nul).
* @error: location to store the error occurring, or %NULL to ignore
* errors. Any of the errors in #GConvertError may occur.
*
* Converts a string from one character set to another, possibly
* including fallback sequences for characters not representable
* in the output. Note that it is not guaranteed that the specification
* for the fallback sequences in @fallback will be honored. Some
* systems may do an approximate conversion from @from_codeset
* to @to_codeset in their iconv() functions,
* in which case GLib will simply return that approximate conversion.
*
* Note that you should use g_iconv() for streaming conversions.
* Despite the fact that @byes_read can return information about partial
* characters, the g_convert_... functions are not generally suitable
* for streaming. If the underlying converter maintains internal state,
* then this won't be preserved across successive calls to g_convert(),
* g_convert_with_iconv() or g_convert_with_fallback(). (An example of
* this is the GNU C converter for CP1255 which does not emit a base
* character until it knows that the next character is not a mark that
* could combine with the base character.)
*
* Returns: If the conversion was successful, a newly allocated
* nul-terminated string, which must be freed with
* g_free(). Otherwise %NULL and @error will be set.
**/
gchar*
g_convert_with_fallback (const gchar *str,
gssize len,
const gchar *to_codeset,
const gchar *from_codeset,
const gchar *fallback,
gsize *bytes_read,
gsize *bytes_written,
GError **error)
{
gchar *utf8;
gchar *dest;
gchar *outp;
const gchar *insert_str = NULL;
const gchar *p;
gsize inbytes_remaining;
const gchar *save_p = NULL;
gsize save_inbytes = 0;
gsize outbytes_remaining;
gsize err;
GIConv cd;
gsize outbuf_size;
gboolean have_error = FALSE;
gboolean done = FALSE;
GError *local_error = NULL;
g_return_val_if_fail (str != NULL, NULL);
g_return_val_if_fail (to_codeset != NULL, NULL);
g_return_val_if_fail (from_codeset != NULL, NULL);
if (len < 0)
len = strlen (str);
/* Try an exact conversion; we only proceed if this fails
* due to an illegal sequence in the input string.
*/
dest = g_convert (str, len, to_codeset, from_codeset,
bytes_read, bytes_written, &local_error);
if (!local_error)
return dest;
if (!g_error_matches (local_error, G_CONVERT_ERROR, G_CONVERT_ERROR_ILLEGAL_SEQUENCE))
{
g_propagate_error (error, local_error);
return NULL;
}
else
g_error_free (local_error);
local_error = NULL;
/* No go; to proceed, we need a converter from "UTF-8" to
* to_codeset, and the string as UTF-8.
*/
cd = open_converter (to_codeset, "UTF-8", error);
if (cd == (GIConv) -1)
{
if (bytes_read)
*bytes_read = 0;
if (bytes_written)
*bytes_written = 0;
return NULL;
}
utf8 = g_convert (str, len, "UTF-8", from_codeset,
bytes_read, &inbytes_remaining, error);
if (!utf8)
{
close_converter (cd);
if (bytes_written)
*bytes_written = 0;
return NULL;
}
/* Now the heart of the code. We loop through the UTF-8 string, and
* whenever we hit an offending character, we form fallback, convert
* the fallback to the target codeset, and then go back to
* converting the original string after finishing with the fallback.
*
* The variables save_p and save_inbytes store the input state
* for the original string while we are converting the fallback
*/
p = utf8;
outbuf_size = len + NUL_TERMINATOR_LENGTH;
outbytes_remaining = outbuf_size - NUL_TERMINATOR_LENGTH;
outp = dest = g_malloc (outbuf_size);
while (!done && !have_error)
{
gsize inbytes_tmp = inbytes_remaining;
err = g_iconv (cd, (char **)&p, &inbytes_tmp, &outp, &outbytes_remaining);
inbytes_remaining = inbytes_tmp;
if (err == (gsize) -1)
{
switch (errno)
{
case EINVAL:
g_assert_not_reached();
break;
case E2BIG:
{
gsize used = outp - dest;
outbuf_size *= 2;
dest = g_realloc (dest, outbuf_size);
outp = dest + used;
outbytes_remaining = outbuf_size - used - NUL_TERMINATOR_LENGTH;
break;
}
case EILSEQ:
if (save_p)
{
/* Error converting fallback string - fatal
*/
g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_ILLEGAL_SEQUENCE,
_("Cannot convert fallback '%s' to codeset '%s'"),
insert_str, to_codeset);
have_error = TRUE;
break;
}
else if (p)
{
if (!fallback)
{
gunichar ch = g_utf8_get_char (p);
insert_str = g_strdup_printf (ch < 0x10000 ? "\\u%04x" : "\\U%08x",
ch);
}
else
insert_str = fallback;
save_p = g_utf8_next_char (p);
save_inbytes = inbytes_remaining - (save_p - p);
p = insert_str;
inbytes_remaining = strlen (p);
break;
}
/* fall thru if p is NULL */
default:
{
int errsv = errno;
g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_FAILED,
_("Error during conversion: %s"),
g_strerror (errsv));
}
have_error = TRUE;
break;
}
}
else
{
if (save_p)
{
if (!fallback)
g_free ((gchar *)insert_str);
p = save_p;
inbytes_remaining = save_inbytes;
save_p = NULL;
}
else if (p)
{
/* call g_iconv with NULL inbuf to cleanup shift state */
p = NULL;
inbytes_remaining = 0;
}
else
done = TRUE;
}
}
/* Cleanup
*/
memset (outp, 0, NUL_TERMINATOR_LENGTH);
close_converter (cd);
if (bytes_written)
*bytes_written = outp - dest; /* Doesn't include '\0' */
g_free (utf8);
if (have_error)
{
if (save_p && !fallback)
g_free ((gchar *)insert_str);
g_free (dest);
return NULL;
}
else
return dest;
}
/*
* g_locale_to_utf8
*
*
*/
static gchar *
strdup_len (const gchar *string,
gssize len,
gsize *bytes_written,
gsize *bytes_read,
GError **error)
{
gsize real_len;
if (!g_utf8_validate (string, len, NULL))
{
if (bytes_read)
*bytes_read = 0;
if (bytes_written)
*bytes_written = 0;
g_set_error_literal (error, G_CONVERT_ERROR, G_CONVERT_ERROR_ILLEGAL_SEQUENCE,
_("Invalid byte sequence in conversion input"));
return NULL;
}
if (len < 0)
real_len = strlen (string);
else
{
real_len = 0;
while (real_len < len && string[real_len])
real_len++;
}
if (bytes_read)
*bytes_read = real_len;
if (bytes_written)
*bytes_written = real_len;
return g_strndup (string, real_len);
}
/**
* g_locale_to_utf8:
* @opsysstring: a string in the encoding of the current locale. On Windows
* this means the system codepage.
* @len: the length of the string, or -1 if the string is
* nul-terminated (Note that some encodings may allow nul
* bytes to occur inside strings. In that case, using -1
* for the @len parameter is unsafe)
* @bytes_read: location to store the number of bytes in the
* input string that were successfully converted, or %NULL.
* Even if the conversion was successful, this may be
* less than @len if there were partial characters
* at the end of the input. If the error
* #G_CONVERT_ERROR_ILLEGAL_SEQUENCE occurs, the value
* stored will the byte offset after the last valid
* input sequence.
* @bytes_written: the number of bytes stored in the output buffer (not
* including the terminating nul).
* @error: location to store the error occurring, or %NULL to ignore
* errors. Any of the errors in #GConvertError may occur.
*
* Converts a string which is in the encoding used for strings by
* the C runtime (usually the same as that used by the operating
* system) in the [current locale][setlocale] into a UTF-8 string.
*
* Returns: A newly-allocated buffer containing the converted string,
* or %NULL on an error, and error will be set.
**/
gchar *
g_locale_to_utf8 (const gchar *opsysstring,
gssize len,
gsize *bytes_read,
gsize *bytes_written,
GError **error)
{
const char *charset;
if (g_get_charset (&charset))
return strdup_len (opsysstring, len, bytes_read, bytes_written, error);
else
return g_convert (opsysstring, len,
"UTF-8", charset, bytes_read, bytes_written, error);
}
/**
* g_locale_from_utf8:
* @utf8string: a UTF-8 encoded string
* @len: the length of the string, or -1 if the string is
* nul-terminated (Note that some encodings may allow nul
* bytes to occur inside strings. In that case, using -1
* for the @len parameter is unsafe)
* @bytes_read: location to store the number of bytes in the
* input string that were successfully converted, or %NULL.
* Even if the conversion was successful, this may be
* less than @len if there were partial characters
* at the end of the input. If the error
* #G_CONVERT_ERROR_ILLEGAL_SEQUENCE occurs, the value
* stored will the byte offset after the last valid
* input sequence.
* @bytes_written: the number of bytes stored in the output buffer (not
* including the terminating nul).
* @error: location to store the error occurring, or %NULL to ignore
* errors. Any of the errors in #GConvertError may occur.
*
* Converts a string from UTF-8 to the encoding used for strings by
* the C runtime (usually the same as that used by the operating
* system) in the [current locale][setlocale]. On Windows this means
* the system codepage.
*
* Returns: A newly-allocated buffer containing the converted string,
* or %NULL on an error, and error will be set.
**/
gchar *
g_locale_from_utf8 (const gchar *utf8string,
gssize len,
gsize *bytes_read,
gsize *bytes_written,
GError **error)
{
const gchar *charset;
if (g_get_charset (&charset))
return strdup_len (utf8string, len, bytes_read, bytes_written, error);
else
return g_convert (utf8string, len,
charset, "UTF-8", bytes_read, bytes_written, error);
}
#ifndef G_PLATFORM_WIN32
typedef struct _GFilenameCharsetCache GFilenameCharsetCache;
struct _GFilenameCharsetCache {
gboolean is_utf8;
gchar *charset;
gchar **filename_charsets;
};
static void
filename_charset_cache_free (gpointer data)
{
GFilenameCharsetCache *cache = data;
g_free (cache->charset);
g_strfreev (cache->filename_charsets);
g_free (cache);
}
/**
* g_get_filename_charsets:
* @charsets: return location for the %NULL-terminated list of encoding names
*
* Determines the preferred character sets used for filenames.
* The first character set from the @charsets is the filename encoding, the
* subsequent character sets are used when trying to generate a displayable
* representation of a filename, see g_filename_display_name().
*
* On Unix, the character sets are determined by consulting the
* environment variables `G_FILENAME_ENCODING` and `G_BROKEN_FILENAMES`.
* On Windows, the character set used in the GLib API is always UTF-8
* and said environment variables have no effect.
*
* `G_FILENAME_ENCODING` may be set to a comma-separated list of
* character set names. The special token "&commat;locale" is taken
* to mean the character set for the [current locale][setlocale].
* If `G_FILENAME_ENCODING` is not set, but `G_BROKEN_FILENAMES` is,
* the character set of the current locale is taken as the filename
* encoding. If neither environment variable is set, UTF-8 is taken
* as the filename encoding, but the character set of the current locale
* is also put in the list of encodings.
*
* The returned @charsets belong to GLib and must not be freed.
*
* Note that on Unix, regardless of the locale character set or
* `G_FILENAME_ENCODING` value, the actual file names present
* on a system might be in any random encoding or just gibberish.
*
* Returns: %TRUE if the filename encoding is UTF-8.
*
* Since: 2.6
*/
gboolean
g_get_filename_charsets (const gchar ***filename_charsets)
{
static GPrivate cache_private = G_PRIVATE_INIT (filename_charset_cache_free);
GFilenameCharsetCache *cache = g_private_get (&cache_private);
const gchar *charset;
if (!cache)
{
cache = g_new0 (GFilenameCharsetCache, 1);
g_private_set (&cache_private, cache);
}
g_get_charset (&charset);
if (!(cache->charset && strcmp (cache->charset, charset) == 0))
{
const gchar *new_charset;
gchar *p;
gint i;
g_free (cache->charset);
g_strfreev (cache->filename_charsets);
cache->charset = g_strdup (charset);
p = getenv ("G_FILENAME_ENCODING");
if (p != NULL && p[0] != '\0')
{
cache->filename_charsets = g_strsplit (p, ",", 0);
cache->is_utf8 = (strcmp (cache->filename_charsets[0], "UTF-8") == 0);
for (i = 0; cache->filename_charsets[i]; i++)
{
if (strcmp ("@locale", cache->filename_charsets[i]) == 0)
{
g_get_charset (&new_charset);
g_free (cache->filename_charsets[i]);
cache->filename_charsets[i] = g_strdup (new_charset);
}
}
}
else if (getenv ("G_BROKEN_FILENAMES") != NULL)
{
cache->filename_charsets = g_new0 (gchar *, 2);
cache->is_utf8 = g_get_charset (&new_charset);
cache->filename_charsets[0] = g_strdup (new_charset);
}
else
{
cache->filename_charsets = g_new0 (gchar *, 3);
cache->is_utf8 = TRUE;
cache->filename_charsets[0] = g_strdup ("UTF-8");
if (!g_get_charset (&new_charset))
cache->filename_charsets[1] = g_strdup (new_charset);
}
}
if (filename_charsets)
*filename_charsets = (const gchar **)cache->filename_charsets;
return cache->is_utf8;
}
#else /* G_PLATFORM_WIN32 */
gboolean
g_get_filename_charsets (const gchar ***filename_charsets)
{
static const gchar *charsets[] = {
"UTF-8",
NULL
};
#ifdef G_OS_WIN32
/* On Windows GLib pretends that the filename charset is UTF-8 */
if (filename_charsets)
*filename_charsets = charsets;
return TRUE;
#else
gboolean result;
/* Cygwin works like before */
result = g_get_charset (&(charsets[0]));
if (filename_charsets)
*filename_charsets = charsets;
return result;
#endif
}
#endif /* G_PLATFORM_WIN32 */
static gboolean
get_filename_charset (const gchar **filename_charset)
{
const gchar **charsets;
gboolean is_utf8;
is_utf8 = g_get_filename_charsets (&charsets);
if (filename_charset)
*filename_charset = charsets[0];
return is_utf8;
}
/**
* g_filename_to_utf8:
* @opsysstring: a string in the encoding for filenames
* @len: the length of the string, or -1 if the string is
* nul-terminated (Note that some encodings may allow nul
* bytes to occur inside strings. In that case, using -1
* for the @len parameter is unsafe)
* @bytes_read: location to store the number of bytes in the
* input string that were successfully converted, or %NULL.
* Even if the conversion was successful, this may be
* less than @len if there were partial characters
* at the end of the input. If the error
* #G_CONVERT_ERROR_ILLEGAL_SEQUENCE occurs, the value
* stored will the byte offset after the last valid
* input sequence.
* @bytes_written: the number of bytes stored in the output buffer (not
* including the terminating nul).
* @error: location to store the error occurring, or %NULL to ignore
* errors. Any of the errors in #GConvertError may occur.
*
* Converts a string which is in the encoding used by GLib for
* filenames into a UTF-8 string. Note that on Windows GLib uses UTF-8
* for filenames; on other platforms, this function indirectly depends on
* the [current locale][setlocale].
*
* Returns: The converted string, or %NULL on an error.
**/
gchar*
g_filename_to_utf8 (const gchar *opsysstring,
gssize len,
gsize *bytes_read,
gsize *bytes_written,
GError **error)
{
const gchar *charset;
g_return_val_if_fail (opsysstring != NULL, NULL);
if (get_filename_charset (&charset))
return strdup_len (opsysstring, len, bytes_read, bytes_written, error);
else
return g_convert (opsysstring, len,
"UTF-8", charset, bytes_read, bytes_written, error);
}
#if defined (G_OS_WIN32) && !defined (_WIN64)
#undef g_filename_to_utf8
/* Binary compatibility version. Not for newly compiled code. Also not needed for
* 64-bit versions as there should be no old deployed binaries that would use
* the old versions.
*/
gchar*
g_filename_to_utf8 (const gchar *opsysstring,
gssize len,
gsize *bytes_read,
gsize *bytes_written,
GError **error)
{
const gchar *charset;
g_return_val_if_fail (opsysstring != NULL, NULL);
if (g_get_charset (&charset))
return strdup_len (opsysstring, len, bytes_read, bytes_written, error);
else
return g_convert (opsysstring, len,
"UTF-8", charset, bytes_read, bytes_written, error);
}
#endif
/**
* g_filename_from_utf8:
* @utf8string: a UTF-8 encoded string.
* @len: the length of the string, or -1 if the string is
* nul-terminated.
* @bytes_read: (out) (allow-none): location to store the number of bytes in
* the input string that were successfully converted, or %NULL.
* Even if the conversion was successful, this may be
* less than @len if there were partial characters
* at the end of the input. If the error
* #G_CONVERT_ERROR_ILLEGAL_SEQUENCE occurs, the value
* stored will the byte offset after the last valid
* input sequence.
* @bytes_written: (out): the number of bytes stored in the output buffer (not
* including the terminating nul).
* @error: location to store the error occurring, or %NULL to ignore
* errors. Any of the errors in #GConvertError may occur.
*
* Converts a string from UTF-8 to the encoding GLib uses for
* filenames. Note that on Windows GLib uses UTF-8 for filenames;
* on other platforms, this function indirectly depends on the
* [current locale][setlocale].
*
* Returns: (array length=bytes_written) (element-type guint8) (transfer full):
* The converted string, or %NULL on an error.
**/
gchar*
g_filename_from_utf8 (const gchar *utf8string,
gssize len,
gsize *bytes_read,
gsize *bytes_written,
GError **error)
{
const gchar *charset;
if (get_filename_charset (&charset))
return strdup_len (utf8string, len, bytes_read, bytes_written, error);
else
return g_convert (utf8string, len,
charset, "UTF-8", bytes_read, bytes_written, error);
}
#if defined (G_OS_WIN32) && !defined (_WIN64)
#undef g_filename_from_utf8
/* Binary compatibility version. Not for newly compiled code. */
gchar*
g_filename_from_utf8 (const gchar *utf8string,
gssize len,
gsize *bytes_read,
gsize *bytes_written,
GError **error)
{
const gchar *charset;
if (g_get_charset (&charset))
return strdup_len (utf8string, len, bytes_read, bytes_written, error);
else
return g_convert (utf8string, len,
charset, "UTF-8", bytes_read, bytes_written, error);
}
#endif
/* Test of haystack has the needle prefix, comparing case
* insensitive. haystack may be UTF-8, but needle must
* contain only ascii. */
static gboolean
has_case_prefix (const gchar *haystack, const gchar *needle)
{
const gchar *h, *n;
/* Eat one character at a time. */
h = haystack;
n = needle;
while (*n && *h &&
g_ascii_tolower (*n) == g_ascii_tolower (*h))
{
n++;
h++;
}
return *n == '\0';
}
typedef enum {
UNSAFE_ALL = 0x1, /* Escape all unsafe characters */
UNSAFE_ALLOW_PLUS = 0x2, /* Allows '+' */
UNSAFE_PATH = 0x8, /* Allows '/', '&', '=', ':', '@', '+', '$' and ',' */
UNSAFE_HOST = 0x10, /* Allows '/' and ':' and '@' */
UNSAFE_SLASHES = 0x20 /* Allows all characters except for '/' and '%' */
} UnsafeCharacterSet;
static const guchar acceptable[96] = {
/* A table of the ASCII chars from space (32) to DEL (127) */
/* ! " # $ % & ' ( ) * + , - . / */
0x00,0x3F,0x20,0x20,0x28,0x00,0x2C,0x3F,0x3F,0x3F,0x3F,0x2A,0x28,0x3F,0x3F,0x1C,
/* 0 1 2 3 4 5 6 7 8 9 : ; < = > ? */
0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x38,0x20,0x20,0x2C,0x20,0x20,
/* @ A B C D E F G H I J K L M N O */
0x38,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
/* P Q R S T U V W X Y Z [ \ ] ^ _ */
0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x20,0x20,0x20,0x20,0x3F,
/* ` a b c d e f g h i j k l m n o */
0x20,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
/* p q r s t u v w x y z { | } ~ DEL */
0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x20,0x20,0x20,0x3F,0x20
};
static const gchar hex[16] = "0123456789ABCDEF";
/* Note: This escape function works on file: URIs, but if you want to
* escape something else, please read RFC-2396 */
static gchar *
g_escape_uri_string (const gchar *string,
UnsafeCharacterSet mask)
{
#define ACCEPTABLE(a) ((a)>=32 && (a)<128 && (acceptable[(a)-32] & use_mask))
const gchar *p;
gchar *q;
gchar *result;
int c;
gint unacceptable;
UnsafeCharacterSet use_mask;
g_return_val_if_fail (mask == UNSAFE_ALL
|| mask == UNSAFE_ALLOW_PLUS
|| mask == UNSAFE_PATH
|| mask == UNSAFE_HOST
|| mask == UNSAFE_SLASHES, NULL);
unacceptable = 0;
use_mask = mask;
for (p = string; *p != '\0'; p++)
{
c = (guchar) *p;
if (!ACCEPTABLE (c))
unacceptable++;
}
result = g_malloc (p - string + unacceptable * 2 + 1);
use_mask = mask;
for (q = result, p = string; *p != '\0'; p++)
{
c = (guchar) *p;
if (!ACCEPTABLE (c))
{
*q++ = '%'; /* means hex coming */
*q++ = hex[c >> 4];
*q++ = hex[c & 15];
}
else
*q++ = *p;
}
*q = '\0';
return result;
}
static gchar *
g_escape_file_uri (const gchar *hostname,
const gchar *pathname)
{
char *escaped_hostname = NULL;
char *escaped_path;
char *res;
#ifdef G_OS_WIN32
char *p, *backslash;
/* Turn backslashes into forward slashes. That's what Netscape
* does, and they are actually more or less equivalent in Windows.
*/
pathname = g_strdup (pathname);
p = (char *) pathname;
while ((backslash = strchr (p, '\\')) != NULL)
{
*backslash = '/';
p = backslash + 1;
}
#endif
if (hostname && *hostname != '\0')
{
escaped_hostname = g_escape_uri_string (hostname, UNSAFE_HOST);
}
escaped_path = g_escape_uri_string (pathname, UNSAFE_PATH);
res = g_strconcat ("file://",
(escaped_hostname) ? escaped_hostname : "",
(*escaped_path != '/') ? "/" : "",
escaped_path,
NULL);
#ifdef G_OS_WIN32
g_free ((char *) pathname);
#endif
g_free (escaped_hostname);
g_free (escaped_path);
return res;
}
static int
unescape_character (const char *scanner)
{
int first_digit;
int second_digit;
first_digit = g_ascii_xdigit_value (scanner[0]);
if (first_digit < 0)
return -1;
second_digit = g_ascii_xdigit_value (scanner[1]);
if (second_digit < 0)
return -1;
return (first_digit << 4) | second_digit;
}
static gchar *
g_unescape_uri_string (const char *escaped,
int len,
const char *illegal_escaped_characters,
gboolean ascii_must_not_be_escaped)
{
const gchar *in, *in_end;
gchar *out, *result;
int c;
if (escaped == NULL)
return NULL;
if (len < 0)
len = strlen (escaped);
result = g_malloc (len + 1);
out = result;
for (in = escaped, in_end = escaped + len; in < in_end; in++)
{
c = *in;
if (c == '%')
{
/* catch partial escape sequences past the end of the substring */
if (in + 3 > in_end)
break;
c = unescape_character (in + 1);
/* catch bad escape sequences and NUL characters */
if (c <= 0)
break;
/* catch escaped ASCII */
if (ascii_must_not_be_escaped && c <= 0x7F)
break;
/* catch other illegal escaped characters */
if (strchr (illegal_escaped_characters, c) != NULL)
break;
in += 2;
}
*out++ = c;
}
g_assert (out - result <= len);
*out = '\0';
if (in != in_end)
{
g_free (result);
return NULL;
}
return result;
}
static gboolean
is_asciialphanum (gunichar c)
{
return c <= 0x7F && g_ascii_isalnum (c);
}
static gboolean
is_asciialpha (gunichar c)
{
return c <= 0x7F && g_ascii_isalpha (c);
}
/* allows an empty string */
static gboolean
hostname_validate (const char *hostname)
{
const char *p;
gunichar c, first_char, last_char;
p = hostname;
if (*p == '\0')
return TRUE;
do
{
/* read in a label */
c = g_utf8_get_char (p);
p = g_utf8_next_char (p);
if (!is_asciialphanum (c))
return FALSE;
first_char = c;
do
{
last_char = c;
c = g_utf8_get_char (p);
p = g_utf8_next_char (p);
}
while (is_asciialphanum (c) || c == '-');
if (last_char == '-')
return FALSE;
/* if that was the last label, check that it was a toplabel */
if (c == '\0' || (c == '.' && *p == '\0'))
return is_asciialpha (first_char);
}
while (c == '.');
return FALSE;
}
/**
* g_filename_from_uri:
* @uri: a uri describing a filename (escaped, encoded in ASCII).
* @hostname: (out) (allow-none): Location to store hostname for the URI, or %NULL.
* If there is no hostname in the URI, %NULL will be
* stored in this location.
* @error: location to store the error occurring, or %NULL to ignore
* errors. Any of the errors in #GConvertError may occur.
*
* Converts an escaped ASCII-encoded URI to a local filename in the
* encoding used for filenames.
*
* Returns: (type filename): a newly-allocated string holding
* the resulting filename, or %NULL on an error.
**/
gchar *
g_filename_from_uri (const gchar *uri,
gchar **hostname,
GError **error)
{
const char *path_part;
const char *host_part;
char *unescaped_hostname;
char *result;
char *filename;
int offs;
#ifdef G_OS_WIN32
char *p, *slash;
#endif
if (hostname)
*hostname = NULL;
if (!has_case_prefix (uri, "file:/"))
{
g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_BAD_URI,
_("The URI '%s' is not an absolute URI using the \"file\" scheme"),
uri);
return NULL;
}
path_part = uri + strlen ("file:");
if (strchr (path_part, '#') != NULL)
{
g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_BAD_URI,
_("The local file URI '%s' may not include a '#'"),
uri);
return NULL;
}
if (has_case_prefix (path_part, "///"))
path_part += 2;
else if (has_case_prefix (path_part, "//"))
{
path_part += 2;
host_part = path_part;
path_part = strchr (path_part, '/');
if (path_part == NULL)
{
g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_BAD_URI,
_("The URI '%s' is invalid"),
uri);
return NULL;
}
unescaped_hostname = g_unescape_uri_string (host_part, path_part - host_part, "", TRUE);
if (unescaped_hostname == NULL ||
!hostname_validate (unescaped_hostname))
{
g_free (unescaped_hostname);
g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_BAD_URI,
_("The hostname of the URI '%s' is invalid"),
uri);
return NULL;
}
if (hostname)
*hostname = unescaped_hostname;
else
g_free (unescaped_hostname);
}
filename = g_unescape_uri_string (path_part, -1, "/", FALSE);
if (filename == NULL)
{
g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_BAD_URI,
_("The URI '%s' contains invalidly escaped characters"),
uri);
return NULL;
}
offs = 0;
#ifdef G_OS_WIN32
/* Drop localhost */
if (hostname && *hostname != NULL &&
g_ascii_strcasecmp (*hostname, "localhost") == 0)
{
g_free (*hostname);
*hostname = NULL;
}
/* Turn slashes into backslashes, because that's the canonical spelling */
p = filename;
while ((slash = strchr (p, '/')) != NULL)
{
*slash = '\\';
p = slash + 1;
}
/* Windows URIs with a drive letter can be like "file://host/c:/foo"
* or "file://host/c|/foo" (some Netscape versions). In those cases, start
* the filename from the drive letter.
*/
if (g_ascii_isalpha (filename[1]))
{
if (filename[2] == ':')
offs = 1;
else if (filename[2] == '|')
{
filename[2] = ':';
offs = 1;
}
}
#endif
result = g_strdup (filename + offs);
g_free (filename);
return result;
}
#if defined (G_OS_WIN32) && !defined (_WIN64)
#undef g_filename_from_uri
gchar *
g_filename_from_uri (const gchar *uri,
gchar **hostname,
GError **error)
{
gchar *utf8_filename;
gchar *retval = NULL;
utf8_filename = g_filename_from_uri_utf8 (uri, hostname, error);
if (utf8_filename)
{
retval = g_locale_from_utf8 (utf8_filename, -1, NULL, NULL, error);
g_free (utf8_filename);
}
return retval;
}
#endif
/**
* g_filename_to_uri:
* @filename: an absolute filename specified in the GLib file name encoding,
* which is the on-disk file name bytes on Unix, and UTF-8 on
* Windows
* @hostname: (allow-none): A UTF-8 encoded hostname, or %NULL for none.
* @error: location to store the error occurring, or %NULL to ignore
* errors. Any of the errors in #GConvertError may occur.
*
* Converts an absolute filename to an escaped ASCII-encoded URI, with the path
* component following Section 3.3. of RFC 2396.
*
* Returns: a newly-allocated string holding the resulting
* URI, or %NULL on an error.
**/
gchar *
g_filename_to_uri (const gchar *filename,
const gchar *hostname,
GError **error)
{
char *escaped_uri;
g_return_val_if_fail (filename != NULL, NULL);
if (!g_path_is_absolute (filename))
{
g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_NOT_ABSOLUTE_PATH,
_("The pathname '%s' is not an absolute path"),
filename);
return NULL;
}
if (hostname &&
!(g_utf8_validate (hostname, -1, NULL)
&& hostname_validate (hostname)))
{
g_set_error_literal (error, G_CONVERT_ERROR, G_CONVERT_ERROR_ILLEGAL_SEQUENCE,
_("Invalid hostname"));
return NULL;
}
#ifdef G_OS_WIN32
/* Don't use localhost unnecessarily */
if (hostname && g_ascii_strcasecmp (hostname, "localhost") == 0)
hostname = NULL;
#endif
escaped_uri = g_escape_file_uri (hostname, filename);
return escaped_uri;
}
#if defined (G_OS_WIN32) && !defined (_WIN64)
#undef g_filename_to_uri
gchar *
g_filename_to_uri (const gchar *filename,
const gchar *hostname,
GError **error)
{
gchar *utf8_filename;
gchar *retval = NULL;
utf8_filename = g_locale_to_utf8 (filename, -1, NULL, NULL, error);
if (utf8_filename)
{
retval = g_filename_to_uri_utf8 (utf8_filename, hostname, error);
g_free (utf8_filename);
}
return retval;
}
#endif
/**
* g_uri_list_extract_uris:
* @uri_list: an URI list
*
* Splits an URI list conforming to the text/uri-list
* mime type defined in RFC 2483 into individual URIs,
* discarding any comments. The URIs are not validated.
*
* Returns: (transfer full): a newly allocated %NULL-terminated list
* of strings holding the individual URIs. The array should be freed
* with g_strfreev().
*
* Since: 2.6
*/
gchar **
g_uri_list_extract_uris (const gchar *uri_list)
{
GSList *uris, *u;
const gchar *p, *q;
gchar **result;
gint n_uris = 0;
uris = NULL;
p = uri_list;
/* We don't actually try to validate the URI according to RFC
* 2396, or even check for allowed characters - we just ignore
* comments and trim whitespace off the ends. We also
* allow LF delimination as well as the specified CRLF.
*
* We do allow comments like specified in RFC 2483.
*/
while (p)
{
if (*p != '#')
{
while (g_ascii_isspace (*p))
p++;
q = p;
while (*q && (*q != '\n') && (*q != '\r'))
q++;
if (q > p)
{
q--;
while (q > p && g_ascii_isspace (*q))
q--;
if (q > p)
{
uris = g_slist_prepend (uris, g_strndup (p, q - p + 1));
n_uris++;
}
}
}
p = strchr (p, '\n');
if (p)
p++;
}
result = g_new (gchar *, n_uris + 1);
result[n_uris--] = NULL;
for (u = uris; u; u = u->next)
result[n_uris--] = u->data;
g_slist_free (uris);
return result;
}
/**
* g_filename_display_basename:
* @filename: an absolute pathname in the GLib file name encoding
*
* Returns the display basename for the particular filename, guaranteed
* to be valid UTF-8. The display name might not be identical to the filename,
* for instance there might be problems converting it to UTF-8, and some files
* can be translated in the display.
*
* If GLib cannot make sense of the encoding of @filename, as a last resort it
* replaces unknown characters with U+FFFD, the Unicode replacement character.
* You can search the result for the UTF-8 encoding of this character (which is
* "\357\277\275" in octal notation) to find out if @filename was in an invalid
* encoding.
*
* You must pass the whole absolute pathname to this functions so that
* translation of well known locations can be done.
*
* This function is preferred over g_filename_display_name() if you know the
* whole path, as it allows translation.
*
* Returns: a newly allocated string containing
* a rendition of the basename of the filename in valid UTF-8
*
* Since: 2.6
**/
gchar *
g_filename_display_basename (const gchar *filename)
{
char *basename;
char *display_name;
g_return_val_if_fail (filename != NULL, NULL);
basename = g_path_get_basename (filename);
display_name = g_filename_display_name (basename);
g_free (basename);
return display_name;
}
/**
* g_filename_display_name:
* @filename: a pathname hopefully in the GLib file name encoding
*
* Converts a filename into a valid UTF-8 string. The conversion is
* not necessarily reversible, so you should keep the original around
* and use the return value of this function only for display purposes.
* Unlike g_filename_to_utf8(), the result is guaranteed to be non-%NULL
* even if the filename actually isn't in the GLib file name encoding.
*
* If GLib cannot make sense of the encoding of @filename, as a last resort it
* replaces unknown characters with U+FFFD, the Unicode replacement character.
* You can search the result for the UTF-8 encoding of this character (which is
* "\357\277\275" in octal notation) to find out if @filename was in an invalid
* encoding.
*
* If you know the whole pathname of the file you should use
* g_filename_display_basename(), since that allows location-based
* translation of filenames.
*
* Returns: a newly allocated string containing
* a rendition of the filename in valid UTF-8
*
* Since: 2.6
**/
gchar *
g_filename_display_name (const gchar *filename)
{
gint i;
const gchar **charsets;
gchar *display_name = NULL;
gboolean is_utf8;
is_utf8 = g_get_filename_charsets (&charsets);
if (is_utf8)
{
if (g_utf8_validate (filename, -1, NULL))
display_name = g_strdup (filename);
}
if (!display_name)
{
/* Try to convert from the filename charsets to UTF-8.
* Skip the first charset if it is UTF-8.
*/
for (i = is_utf8 ? 1 : 0; charsets[i]; i++)
{
display_name = g_convert (filename, -1, "UTF-8", charsets[i],
NULL, NULL, NULL);
if (display_name)
break;
}
}
/* if all conversions failed, we replace invalid UTF-8
* by a question mark
*/
if (!display_name)
display_name = _g_utf8_make_valid (filename);
return display_name;
}
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