gtk2/gtk/gtkpasswordentrybuffer.c
Matthias Clasen 91f7b9663f gtk: Clean up docs syntax
Replace leftover gtk-doc syntax (#Type) with backquotes.
2021-05-22 17:25:26 -04:00

207 lines
6.2 KiB
C

/* gtkpasswordentrybuffer.c: Entry buffer with secure allocation
*
Copyright 2009 Stefan Walter
* Copyright 2020 GNOME Foundation
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* 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 "config.h"
#include "gtkpasswordentrybufferprivate.h"
#include "gtksecurememoryprivate.h"
#include <string.h>
/* Initial size of buffer, in bytes */
#define MIN_SIZE 16
struct _GtkPasswordEntryBuffer
{
GtkEntryBuffer parent_instance;
char *text;
gsize text_size;
gsize text_bytes;
guint text_chars;
};
G_DEFINE_TYPE (GtkPasswordEntryBuffer, gtk_password_entry_buffer, GTK_TYPE_ENTRY_BUFFER)
static const char *
gtk_password_entry_buffer_real_get_text (GtkEntryBuffer *buffer,
gsize *n_bytes)
{
GtkPasswordEntryBuffer *self = GTK_PASSWORD_ENTRY_BUFFER (buffer);
if (n_bytes != NULL)
*n_bytes = self->text_bytes;
if (!self->text)
return "";
return self->text;
}
static guint
gtk_password_entry_buffer_real_get_length (GtkEntryBuffer *buffer)
{
GtkPasswordEntryBuffer *self = GTK_PASSWORD_ENTRY_BUFFER (buffer);
return self->text_chars;
}
static guint
gtk_password_entry_buffer_real_insert_text (GtkEntryBuffer *buffer,
guint position,
const char *chars,
guint n_chars)
{
GtkPasswordEntryBuffer *self = GTK_PASSWORD_ENTRY_BUFFER (buffer);
gsize n_bytes = g_utf8_offset_to_pointer (chars, n_chars) - chars;
/* Need more memory */
if (n_bytes + self->text_bytes + 1 > self->text_size)
{
/* Calculate our new buffer size */
while (n_bytes + self->text_bytes + 1 > self->text_size)
{
if (self->text_size == 0)
{
self->text_size = MIN_SIZE;
}
else
{
if (2 * self->text_size < GTK_ENTRY_BUFFER_MAX_SIZE)
{
self->text_size *= 2;
}
else
{
self->text_size = GTK_ENTRY_BUFFER_MAX_SIZE;
if (n_bytes > self->text_size - self->text_bytes - 1)
{
n_bytes = self->text_size - self->text_bytes - 1;
n_bytes = g_utf8_find_prev_char (chars, chars + n_bytes + 1) - chars;
n_chars = g_utf8_strlen (chars, n_bytes);
}
break;
}
}
}
self->text = gtk_secure_realloc (self->text, self->text_size);
}
/* Actual text insertion */
gsize at = g_utf8_offset_to_pointer (self->text, position) - self->text;
memmove (self->text + at + n_bytes, self->text + at, self->text_bytes - at);
memcpy (self->text + at, chars, n_bytes);
/* Book keeping */
self->text_bytes += n_bytes;
self->text_chars += n_chars;
self->text[self->text_bytes] = '\0';
gtk_entry_buffer_emit_inserted_text (buffer, position, chars, n_chars);
return n_chars;
}
static void
gtk_password_entry_buffer_real_deleted_text (GtkEntryBuffer *buffer,
guint position,
guint n_chars)
{
GtkPasswordEntryBuffer *self = GTK_PASSWORD_ENTRY_BUFFER (buffer);
gsize start = g_utf8_offset_to_pointer (self->text, position) - self->text;
gsize end = g_utf8_offset_to_pointer (self->text, position + n_chars) - self->text;
memmove (self->text + start, self->text + end, self->text_bytes + 1 - end);
self->text_chars -= n_chars;
self->text_bytes -= (end - start);
g_object_notify (G_OBJECT (buffer), "text");
g_object_notify (G_OBJECT (buffer), "length");
}
static guint
gtk_password_entry_buffer_real_delete_text (GtkEntryBuffer *buffer,
guint position,
guint n_chars)
{
GtkPasswordEntryBuffer *self = GTK_PASSWORD_ENTRY_BUFFER (buffer);
if (position > self->text_chars)
position = self->text_chars;
if (position + n_chars > self->text_chars)
n_chars = self->text_chars - position;
if (n_chars > 0)
gtk_entry_buffer_emit_deleted_text (buffer, position, n_chars);
return n_chars;
}
static void
gtk_password_entry_buffer_finalize (GObject *gobject)
{
GtkPasswordEntryBuffer *self = GTK_PASSWORD_ENTRY_BUFFER (gobject);
g_clear_pointer (&self->text, gtk_secure_free);
self->text_bytes = 0;
self->text_size = 0;
self->text_chars = 0;
G_OBJECT_CLASS (gtk_password_entry_buffer_parent_class)->finalize (gobject);
}
static void
gtk_password_entry_buffer_class_init (GtkPasswordEntryBufferClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GtkEntryBufferClass *buffer_class = GTK_ENTRY_BUFFER_CLASS (klass);
gobject_class->finalize = gtk_password_entry_buffer_finalize;
buffer_class->get_text = gtk_password_entry_buffer_real_get_text;
buffer_class->get_length = gtk_password_entry_buffer_real_get_length;
buffer_class->insert_text = gtk_password_entry_buffer_real_insert_text;
buffer_class->delete_text = gtk_password_entry_buffer_real_delete_text;
buffer_class->deleted_text = gtk_password_entry_buffer_real_deleted_text;
}
static void
gtk_password_entry_buffer_init (GtkPasswordEntryBuffer *self)
{
}
/*< private >
* gtk_password_entry_buffer_new:
*
* Creates a new `GtkEntryBuffer` using secure memory allocations.
*
* Returns: (transfer full): the newly created instance
*/
GtkEntryBuffer *
gtk_password_entry_buffer_new (void)
{
return g_object_new (GTK_TYPE_PASSWORD_ENTRY_BUFFER, NULL);
}