gri3-wm/libi3/g_utf8_make_valid.c

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/* g_utf8_make_valid.c - Coerce string into UTF-8
*
* Copyright (C) 1999 Tom Tromey
* Copyright (C) 2000 Red Hat, Inc.
*
* 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 2.1 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 "libi3.h"
#include <string.h>
#include <glib.h>
/* Copied from:
* https://gitlab.gnome.org/GNOME/glib/blob/f928dfdf57bf92c883b53b16d7a9d49add504f52/glib/gutf8.c#L1752-1815 */
/* clang-format off */
#if !HAS_G_UTF8_MAKE_VALID
/**
* g_utf8_make_valid:
* @str: string to coerce into UTF-8
* @len: the maximum length of @str to use, in bytes. If @len < 0,
* then the string is nul-terminated.
*
* If the provided string is valid UTF-8, return a copy of it. If not,
* return a copy in which bytes that could not be interpreted as valid Unicode
* are replaced with the Unicode replacement character (U+FFFD).
*
* For example, this is an appropriate function to use if you have received
* a string that was incorrectly declared to be UTF-8, and you need a valid
* UTF-8 version of it that can be logged or displayed to the user, with the
* assumption that it is close enough to ASCII or UTF-8 to be mostly
* readable as-is.
*
* Returns: (transfer full): a valid UTF-8 string whose content resembles @str
*
* Since: 2.52
*/
gchar *
g_utf8_make_valid (const gchar *str,
gssize len)
{
GString *string;
const gchar *remainder, *invalid;
gsize remaining_bytes, valid_bytes;
g_return_val_if_fail (str != NULL, NULL);
if (len < 0)
len = strlen (str);
string = NULL;
remainder = str;
remaining_bytes = len;
while (remaining_bytes != 0)
{
if (g_utf8_validate (remainder, remaining_bytes, &invalid))
break;
valid_bytes = invalid - remainder;
if (string == NULL)
string = g_string_sized_new (remaining_bytes);
g_string_append_len (string, remainder, valid_bytes);
/* append U+FFFD REPLACEMENT CHARACTER */
g_string_append (string, "\357\277\275");
remaining_bytes -= valid_bytes + 1;
remainder = invalid + 1;
}
if (string == NULL)
return g_strndup (str, len);
g_string_append_len (string, remainder, remaining_bytes);
g_string_append_c (string, '\0');
g_assert (g_utf8_validate (string->str, -1, NULL));
return g_string_free (string, FALSE);
}
#endif