b4e110920a
Avoid diagnostics for gcc-11 false positive out of bounds accesses See merge request GNOME/gtk!3064 (cherry picked from commit 5044031b53988627c2937c6b5f8919a37e18f21f) c514c41d Avoid diagnostics for gcc-11 false positive out of bounds accesses
670 lines
19 KiB
C
670 lines
19 KiB
C
/*
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* gtktextsegment.c --
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*
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* Code for segments in general, and toggle/char segments in particular.
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*
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* Copyright (c) 1992-1994 The Regents of the University of California.
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* Copyright (c) 1994-1995 Sun Microsystems, Inc.
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* Copyright (c) 2000 Red Hat, Inc.
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* Tk -> Gtk port by Havoc Pennington <hp@redhat.com>
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*
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* This software is copyrighted by the Regents of the University of
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* California, Sun Microsystems, Inc., and other parties. The
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* following terms apply to all files associated with the software
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* unless explicitly disclaimed in individual files.
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*
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* The authors hereby grant permission to use, copy, modify,
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* distribute, and license this software and its documentation for any
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* purpose, provided that existing copyright notices are retained in
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* all copies and that this notice is included verbatim in any
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* distributions. No written agreement, license, or royalty fee is
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* required for any of the authorized uses. Modifications to this
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* software may be copyrighted by their authors and need not follow
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* the licensing terms described here, provided that the new terms are
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* clearly indicated on the first page of each file where they apply.
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*
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* IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY
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* PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
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* DAMAGES ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION,
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* OR ANY DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
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* NON-INFRINGEMENT. THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS,
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* AND THE AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE
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* MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* GOVERNMENT USE: If you are acquiring this software on behalf of the
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* U.S. government, the Government shall have only "Restricted Rights"
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* in the software and related documentation as defined in the Federal
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* Acquisition Regulations (FARs) in Clause 52.227.19 (c) (2). If you
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* are acquiring the software on behalf of the Department of Defense,
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* the software shall be classified as "Commercial Computer Software"
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* and the Government shall have only "Restricted Rights" as defined
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* in Clause 252.227-7013 (c) (1) of DFARs. Notwithstanding the
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* foregoing, the authors grant the U.S. Government and others acting
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* in its behalf permission to use and distribute the software in
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* accordance with the terms specified in this license.
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*
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*/
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#define GTK_TEXT_USE_INTERNAL_UNSUPPORTED_API
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#include "config.h"
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#include "gtktextbtree.h"
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "gtktexttag.h"
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#include "gtktexttagtable.h"
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#include "gtktextlayout.h"
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#include "gtktextiterprivate.h"
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#include "gtkdebug.h"
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/*
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*--------------------------------------------------------------
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*
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* split_segment --
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*
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* This procedure is called before adding or deleting
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* segments. It does three things: (a) it finds the segment
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* containing iter; (b) if there are several such
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* segments (because some segments have zero length) then
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* it picks the first segment that does not have left
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* gravity; (c) if the index refers to the middle of
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* a segment then it splits the segment so that the
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* index now refers to the beginning of a segment.
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*
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* Results:
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* The return value is a pointer to the segment just
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* before the segment corresponding to iter (as
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* described above). If the segment corresponding to
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* iter is the first in its line then the return
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* value is NULL.
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*
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* Side effects:
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* The segment referred to by iter is split unless
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* iter refers to its first character.
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*
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*--------------------------------------------------------------
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*/
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GtkTextLineSegment*
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gtk_text_line_segment_split (const GtkTextIter *iter)
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{
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GtkTextLineSegment *prev, *seg;
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GtkTextBTree *tree;
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GtkTextLine *line;
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int count;
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line = _gtk_text_iter_get_text_line (iter);
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tree = _gtk_text_iter_get_btree (iter);
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count = gtk_text_iter_get_line_index (iter);
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if (GTK_DEBUG_CHECK (TEXT))
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_gtk_text_iter_check (iter);
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prev = NULL;
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seg = line->segments;
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while (seg != NULL)
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{
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if (seg->byte_count > count)
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{
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if (count == 0)
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{
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return prev;
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}
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else
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{
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g_assert (count != seg->byte_count);
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g_assert (seg->byte_count > 0);
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_gtk_text_btree_segments_changed (tree);
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seg = (*seg->type->splitFunc)(seg, count);
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if (prev == NULL)
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line->segments = seg;
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else
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prev->next = seg;
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return seg;
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}
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}
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else if ((seg->byte_count == 0) && (count == 0)
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&& !seg->type->leftGravity)
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{
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return prev;
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}
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count -= seg->byte_count;
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prev = seg;
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seg = seg->next;
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}
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g_error ("split_segment reached end of line!");
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return NULL;
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}
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/*
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* Macros that determine how much space to allocate for new segments:
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*/
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#define CSEG_SIZE(chars) ((unsigned) (G_STRUCT_OFFSET (GtkTextLineSegment, body) \
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+ 1 + (chars)))
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#define TSEG_SIZE ((unsigned) (G_STRUCT_OFFSET (GtkTextLineSegment, body) \
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+ sizeof (GtkTextToggleBody)))
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/*
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* Type functions
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*/
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static void
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char_segment_self_check (GtkTextLineSegment *seg)
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{
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/* This function checks the segment itself, but doesn't
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assume the segment has been validly inserted into
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the btree. */
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g_assert (seg != NULL);
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if (seg->byte_count <= 0)
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{
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g_error ("segment has size <= 0");
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}
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if (strlen (seg->body.chars) != seg->byte_count)
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{
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g_error ("segment has wrong size");
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}
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if (g_utf8_strlen (seg->body.chars, seg->byte_count) != seg->char_count)
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{
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g_error ("char segment has wrong character count");
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}
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}
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GtkTextLineSegment*
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_gtk_char_segment_new (const gchar *text, guint len)
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{
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GtkTextLineSegment *seg;
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g_assert (gtk_text_byte_begins_utf8_char (text));
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seg = g_slice_alloc (CSEG_SIZE (len));
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seg->type = (GtkTextLineSegmentClass *)>k_text_char_type;
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seg->next = NULL;
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seg->byte_count = len;
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memcpy (seg->body.chars, text, len);
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seg->body.chars[len] = '\0';
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seg->char_count = g_utf8_strlen (seg->body.chars, seg->byte_count);
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if (GTK_DEBUG_CHECK (TEXT))
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char_segment_self_check (seg);
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return seg;
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}
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GtkTextLineSegment*
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_gtk_char_segment_new_from_two_strings (const gchar *text1,
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guint len1,
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guint chars1,
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const gchar *text2,
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guint len2,
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guint chars2)
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{
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GtkTextLineSegment *seg;
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g_assert (gtk_text_byte_begins_utf8_char (text1));
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g_assert (gtk_text_byte_begins_utf8_char (text2));
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seg = g_slice_alloc (CSEG_SIZE (len1+len2));
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seg->type = >k_text_char_type;
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seg->next = NULL;
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seg->byte_count = len1 + len2;
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memcpy (seg->body.chars, text1, len1);
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memcpy (seg->body.chars + len1, text2, len2);
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seg->body.chars[len1+len2] = '\0';
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seg->char_count = chars1 + chars2;
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if (GTK_DEBUG_CHECK (TEXT))
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char_segment_self_check (seg);
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return seg;
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}
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static void
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_gtk_char_segment_free (GtkTextLineSegment *seg)
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{
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if (seg == NULL)
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return;
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g_assert (seg->type == >k_text_char_type);
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g_slice_free1 (CSEG_SIZE (seg->byte_count), seg);
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}
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/*
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*--------------------------------------------------------------
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*
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* char_segment_split_func --
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*
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* This procedure implements splitting for character segments.
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*
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* Results:
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* The return value is a pointer to a chain of two segments
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* that have the same characters as segPtr except split
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* among the two segments.
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*
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* Side effects:
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* Storage for segPtr is freed.
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*
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*--------------------------------------------------------------
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*/
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static GtkTextLineSegment *
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char_segment_split_func (GtkTextLineSegment *seg, int index)
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{
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GtkTextLineSegment *new1, *new2;
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g_assert (index < seg->byte_count);
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if (GTK_DEBUG_CHECK (TEXT))
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{
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char_segment_self_check (seg);
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}
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new1 = _gtk_char_segment_new (seg->body.chars, index);
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new2 = _gtk_char_segment_new (seg->body.chars + index, seg->byte_count - index);
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g_assert (gtk_text_byte_begins_utf8_char (new1->body.chars));
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g_assert (gtk_text_byte_begins_utf8_char (new2->body.chars));
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g_assert (new1->byte_count + new2->byte_count == seg->byte_count);
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g_assert (new1->char_count + new2->char_count == seg->char_count);
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new1->next = new2;
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new2->next = seg->next;
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if (GTK_DEBUG_CHECK (TEXT))
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{
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char_segment_self_check (new1);
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char_segment_self_check (new2);
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}
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_gtk_char_segment_free (seg);
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return new1;
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}
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/*
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*--------------------------------------------------------------
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*
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* char_segment_cleanup_func --
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*
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* This procedure merges adjacent character segments into
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* a single character segment, if possible.
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*
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* Arguments:
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* segPtr: Pointer to the first of two adjacent segments to
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* join.
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* line: Line containing segments (not used).
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*
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* Results:
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* The return value is a pointer to the first segment in
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* the (new) list of segments that used to start with segPtr.
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*
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* Side effects:
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* Storage for the segments may be allocated and freed.
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*
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*--------------------------------------------------------------
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*/
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/* ARGSUSED */
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static GtkTextLineSegment *
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char_segment_cleanup_func (GtkTextLineSegment *segPtr, GtkTextLine *line)
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{
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GtkTextLineSegment *segPtr2, *newPtr;
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if (GTK_DEBUG_CHECK (TEXT))
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char_segment_self_check (segPtr);
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segPtr2 = segPtr->next;
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if ((segPtr2 == NULL) || (segPtr2->type != >k_text_char_type))
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{
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return segPtr;
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}
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newPtr =
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_gtk_char_segment_new_from_two_strings (segPtr->body.chars,
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segPtr->byte_count,
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segPtr->char_count,
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segPtr2->body.chars,
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segPtr2->byte_count,
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segPtr2->char_count);
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newPtr->next = segPtr2->next;
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if (GTK_DEBUG_CHECK (TEXT))
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char_segment_self_check (newPtr);
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_gtk_char_segment_free (segPtr);
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_gtk_char_segment_free (segPtr2);
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return newPtr;
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}
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/*
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*--------------------------------------------------------------
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*
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* char_segment_delete_func --
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*
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* This procedure is invoked to delete a character segment.
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*
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* Arguments:
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* segPtr : Segment to delete
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* line : Line containing segment
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* treeGone : Non-zero means the entire tree is being
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* deleted, so everything must get cleaned up.
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*
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* Results:
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* Always returns 0 to indicate that the segment was deleted.
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*
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* Side effects:
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* Storage for the segment is freed.
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*
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*--------------------------------------------------------------
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*/
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/* ARGSUSED */
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static int
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char_segment_delete_func (GtkTextLineSegment *segPtr, GtkTextLine *line, int treeGone)
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{
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_gtk_char_segment_free (segPtr);
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return 0;
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}
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/*
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*--------------------------------------------------------------
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*
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* char_segment_check_func --
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*
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* This procedure is invoked to perform consistency checks
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* on character segments.
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*
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* Arguments:
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* segPtr : Segment to check
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* line : Line containing segment
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*
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* Results:
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* None.
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*
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* Side effects:
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* If the segment isn’t inconsistent then the procedure
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* g_errors.
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*
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*--------------------------------------------------------------
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*/
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/* ARGSUSED */
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static void
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char_segment_check_func (GtkTextLineSegment *segPtr, GtkTextLine *line)
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{
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char_segment_self_check (segPtr);
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if (segPtr->next != NULL)
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{
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if (segPtr->next->type == >k_text_char_type)
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{
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g_error ("adjacent character segments weren't merged");
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}
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}
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}
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GtkTextLineSegment*
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_gtk_toggle_segment_new (GtkTextTagInfo *info, gboolean on)
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{
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/* gcc-11 issues a diagnostic here because the size allocated
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for SEG does not cover the entire size of a GtkTextLineSegment
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and gcc has no way to know that the union will only be used
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for limited types and the additional space is not needed. */
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Warray-bounds"
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GtkTextLineSegment *seg;
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seg = g_slice_alloc (TSEG_SIZE);
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seg->type = on ? >k_text_toggle_on_type : >k_text_toggle_off_type;
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seg->next = NULL;
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seg->byte_count = 0;
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seg->char_count = 0;
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seg->body.toggle.info = info;
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seg->body.toggle.inNodeCounts = 0;
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return seg;
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#pragma GCC diagnostic pop
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}
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void
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_gtk_toggle_segment_free (GtkTextLineSegment *seg)
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{
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if (seg == NULL)
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return;
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g_assert (seg->type == >k_text_toggle_on_type ||
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seg->type == >k_text_toggle_off_type);
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g_slice_free1 (TSEG_SIZE, seg);
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}
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/*
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*--------------------------------------------------------------
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*
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* toggle_segment_delete_func --
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*
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* This procedure is invoked to delete toggle segments.
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*
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* Arguments:
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* segPtr : Segment to check
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* line : Line containing segment
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* treeGone : Non-zero means the entire tree is being
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* deleted so everything must get cleaned up
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*
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* Results:
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* Returns 1 to indicate that the segment may not be deleted,
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* unless the entire B-tree is going away.
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*
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* Side effects:
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* If the tree is going away then the toggle’s memory is
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* freed; otherwise the toggle counts in GtkTextBTreeNodes above the
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* segment get updated.
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*
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*--------------------------------------------------------------
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*/
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static int
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toggle_segment_delete_func (GtkTextLineSegment *segPtr, GtkTextLine *line, int treeGone)
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{
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if (treeGone)
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{
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_gtk_toggle_segment_free (segPtr);
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return 0;
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}
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/*
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* This toggle is in the middle of a range of characters that's
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* being deleted. Refuse to die. We'll be moved to the end of
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* the deleted range and our cleanup procedure will be called
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* later. Decrement GtkTextBTreeNode toggle counts here, and set a flag
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* so we'll re-increment them in the cleanup procedure.
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*/
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if (segPtr->body.toggle.inNodeCounts)
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{
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_gtk_change_node_toggle_count (line->parent,
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segPtr->body.toggle.info, -1);
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segPtr->body.toggle.inNodeCounts = 0;
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}
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return 1;
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}
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/*
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*--------------------------------------------------------------
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*
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* toggle_segment_cleanup_func --
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*
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* This procedure is called when a toggle is part of a line that's
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* been modified in some way. It’s invoked after the
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* modifications are complete.
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*
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* Arguments:
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* segPtr : Segment to check
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* line : Line that now contains segment
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*
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* Results:
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* The return value is the head segment in a new list
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* that is to replace the tail of the line that used to
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* start at segPtr. This allows the procedure to delete
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* or modify segPtr.
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*
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* Side effects:
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* Toggle counts in the GtkTextBTreeNodes above the new line will be
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* updated if they’re not already. Toggles may be collapsed
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* if there are duplicate toggles at the same position.
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*
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*--------------------------------------------------------------
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*/
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static GtkTextLineSegment *
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toggle_segment_cleanup_func (GtkTextLineSegment *segPtr, GtkTextLine *line)
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{
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GtkTextLineSegment *segPtr2, *prevPtr;
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int counts;
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/*
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* If this is a toggle-off segment, look ahead through the next
|
||
* segments to see if there's a toggle-on segment for the same tag
|
||
* before any segments with non-zero size. If so then the two
|
||
* toggles cancel each other; remove them both.
|
||
*/
|
||
|
||
if (segPtr->type == >k_text_toggle_off_type)
|
||
{
|
||
for (prevPtr = segPtr, segPtr2 = prevPtr->next;
|
||
(segPtr2 != NULL) && (segPtr2->byte_count == 0);
|
||
prevPtr = segPtr2, segPtr2 = prevPtr->next)
|
||
{
|
||
if (segPtr2->type != >k_text_toggle_on_type)
|
||
{
|
||
continue;
|
||
}
|
||
if (segPtr2->body.toggle.info != segPtr->body.toggle.info)
|
||
{
|
||
continue;
|
||
}
|
||
counts = segPtr->body.toggle.inNodeCounts
|
||
+ segPtr2->body.toggle.inNodeCounts;
|
||
if (counts != 0)
|
||
{
|
||
_gtk_change_node_toggle_count (line->parent,
|
||
segPtr->body.toggle.info, -counts);
|
||
}
|
||
prevPtr->next = segPtr2->next;
|
||
_gtk_toggle_segment_free (segPtr2);
|
||
segPtr2 = segPtr->next;
|
||
_gtk_toggle_segment_free (segPtr);
|
||
return segPtr2;
|
||
}
|
||
}
|
||
|
||
if (!segPtr->body.toggle.inNodeCounts)
|
||
{
|
||
_gtk_change_node_toggle_count (line->parent,
|
||
segPtr->body.toggle.info, 1);
|
||
segPtr->body.toggle.inNodeCounts = 1;
|
||
}
|
||
return segPtr;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* toggle_segment_line_change_func --
|
||
*
|
||
* This procedure is invoked when a toggle segment is about
|
||
* to move from one line to another.
|
||
*
|
||
* Arguments:
|
||
* segPtr : Segment to check
|
||
* line : Line that used to contain segment
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Toggle counts are decremented in the GtkTextBTreeNodes above the line.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
toggle_segment_line_change_func (GtkTextLineSegment *segPtr, GtkTextLine *line)
|
||
{
|
||
if (segPtr->body.toggle.inNodeCounts)
|
||
{
|
||
_gtk_change_node_toggle_count (line->parent,
|
||
segPtr->body.toggle.info, -1);
|
||
segPtr->body.toggle.inNodeCounts = 0;
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Virtual tables
|
||
*/
|
||
|
||
|
||
const GtkTextLineSegmentClass gtk_text_char_type = {
|
||
"character", /* name */
|
||
0, /* leftGravity */
|
||
char_segment_split_func, /* splitFunc */
|
||
char_segment_delete_func, /* deleteFunc */
|
||
char_segment_cleanup_func, /* cleanupFunc */
|
||
NULL, /* lineChangeFunc */
|
||
char_segment_check_func /* checkFunc */
|
||
};
|
||
|
||
/*
|
||
* Type record for segments marking the beginning of a tagged
|
||
* range:
|
||
*/
|
||
|
||
const GtkTextLineSegmentClass gtk_text_toggle_on_type = {
|
||
"toggleOn", /* name */
|
||
0, /* leftGravity */
|
||
NULL, /* splitFunc */
|
||
toggle_segment_delete_func, /* deleteFunc */
|
||
toggle_segment_cleanup_func, /* cleanupFunc */
|
||
toggle_segment_line_change_func, /* lineChangeFunc */
|
||
_gtk_toggle_segment_check_func /* checkFunc */
|
||
};
|
||
|
||
/*
|
||
* Type record for segments marking the end of a tagged
|
||
* range:
|
||
*/
|
||
|
||
const GtkTextLineSegmentClass gtk_text_toggle_off_type = {
|
||
"toggleOff", /* name */
|
||
1, /* leftGravity */
|
||
NULL, /* splitFunc */
|
||
toggle_segment_delete_func, /* deleteFunc */
|
||
toggle_segment_cleanup_func, /* cleanupFunc */
|
||
toggle_segment_line_change_func, /* lineChangeFunc */
|
||
_gtk_toggle_segment_check_func /* checkFunc */
|
||
};
|