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