Bug Summary

File:content/handlers/html/box_inspect.c
Warning:line 894, column 10
The right operand of '-' is a garbage value

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name box_inspect.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=none -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/var/lib/jenkins/workspace/scan-build-netsurf -resource-dir /usr/lib/llvm-14/lib/clang/14.0.6 -I . -I include -I build/Linux-gtk2 -I frontends -I content/handlers -D WITH_JPEG -U WITH_PDF_EXPORT -D LIBICONV_PLUG -I /var/lib/jenkins/artifacts-x86_64-linux-gnu/include -I /var/lib/jenkins/artifacts-x86_64-linux-gnu/include -I /var/lib/jenkins/artifacts-x86_64-linux-gnu/include -I /usr/include/x86_64-linux-gnu -D WITH_CURL -D WITH_OPENSSL -I /var/lib/jenkins/artifacts-x86_64-linux-gnu/include -D UTF8PROC_EXPORTS -D WITH_UTF8PROC -D WITH_WEBP -I /usr/include/libpng16 -D WITH_PNG -I /var/lib/jenkins/artifacts-x86_64-linux-gnu/include/ -D WITH_BMP -I /var/lib/jenkins/artifacts-x86_64-linux-gnu/include -D WITH_GIF -I /var/lib/jenkins/artifacts-x86_64-linux-gnu/include -D WITH_NS_SVG -I /var/lib/jenkins/artifacts-x86_64-linux-gnu/include -D WITH_NSSPRITE -I /var/lib/jenkins/artifacts-x86_64-linux-gnu/include -D WITH_NSPSL -I /var/lib/jenkins/artifacts-x86_64-linux-gnu/include -D WITH_NSLOG -D NETSURF_UA_FORMAT_STRING="Mozilla/5.0 (%s) NetSurf/%d.%d" -D NETSURF_HOMEPAGE="about:welcome" -D NETSURF_LOG_LEVEL=VERBOSE -D NETSURF_BUILTIN_LOG_FILTER="(level:WARNING || cat:jserrors)" -D NETSURF_BUILTIN_VERBOSE_FILTER="(level:VERBOSE || cat:jserrors)" -D STMTEXPR=1 -I /usr/include/librsvg-2.0 -I /usr/include/glib-2.0 -I /usr/lib/x86_64-linux-gnu/glib-2.0/include -I /usr/include/libmount -I /usr/include/blkid -I /usr/include/gdk-pixbuf-2.0 -I /usr/include/libpng16 -I /usr/include/x86_64-linux-gnu -I /usr/include/cairo -I /usr/include/pixman-1 -I /usr/include/freetype2 -D WITH_RSVG -I /usr/include/gtk-2.0 -I /usr/lib/x86_64-linux-gnu/gtk-2.0/include -I /usr/include/pango-1.0 -I /usr/include/glib-2.0 -I /usr/lib/x86_64-linux-gnu/glib-2.0/include -I /usr/include/harfbuzz -I /usr/include/freetype2 -I /usr/include/libpng16 -I /usr/include/libmount -I /usr/include/blkid -I /usr/include/fribidi -I /usr/include/cairo -I /usr/include/pixman-1 -I /usr/include/gdk-pixbuf-2.0 -I /usr/include/x86_64-linux-gnu -I /usr/include/atk-1.0 -I /usr/include/glib-2.0 -I /usr/lib/x86_64-linux-gnu/glib-2.0/include -I /usr/include/glib-2.0 -I /usr/lib/x86_64-linux-gnu/glib-2.0/include -D gtk -D nsgtk -D G_DISABLE_SINGLE_INCLUDES -D G_DISABLE_DEPRECATED -D GTK_DISABLE_SINGLE_INCLUDES -D GTK_MULTIHEAD_SAFE -D PANGO_DISABLE_DEPRECATED -D GTK_DISABLE_DEPRECATED -D _XOPEN_SOURCE=700 -D _POSIX_C_SOURCE=200809L -D _BSD_SOURCE -D _DEFAULT_SOURCE -D _NETBSD_SOURCE -D GTK_RESPATH="/var/lib/jenkins/artifacts-x86_64-linux-gnu/share/netsurf/:./frontends/gtk/res/" -D WITH_GRESOURCE -D DUK_OPT_HAVE_CUSTOM_H -internal-isystem /usr/lib/llvm-14/lib/clang/14.0.6/include -internal-isystem /usr/local/include -internal-isystem /usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wwrite-strings -Wno-unused-parameter -Wno-unused-but-set-variable -std=c99 -fconst-strings -fdebug-compilation-dir=/var/lib/jenkins/workspace/scan-build-netsurf -ferror-limit 19 -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -analyzer-display-progress -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /var/lib/jenkins/workspace/scan-build-netsurf/clangScanBuildReports/2024-10-20-131150-539961-1 -x c content/handlers/html/box_inspect.c
1/*
2 * Copyright 2008 Michael Drake <tlsa@netsurf-browser.org>
3 * Copyright 2020 Vincent Sanders <vince@netsurf-browser.org>
4 *
5 * This file is part of NetSurf, http://www.netsurf-browser.org/
6 *
7 * NetSurf is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; version 2 of the License.
10 *
11 * NetSurf is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20/**
21 * \file
22 * implementation of box tree inspection.
23 */
24
25#include <stdio.h>
26#include <dom/dom.h>
27
28#include "utils/utils.h"
29#include "utils/nsurl.h"
30#include "utils/errors.h"
31#include "netsurf/types.h"
32#include "netsurf/content.h"
33#include "netsurf/mouse.h"
34#include "css/utils.h"
35#include "css/dump.h"
36#include "desktop/scrollbar.h"
37
38#include "html/private.h"
39#include "html/box.h"
40#include "html/box_inspect.h"
41
42/**
43 * Direction to move in a box-tree walk
44 */
45enum box_walk_dir {
46 BOX_WALK_CHILDREN,
47 BOX_WALK_PARENT,
48 BOX_WALK_NEXT_SIBLING,
49 BOX_WALK_FLOAT_CHILDREN,
50 BOX_WALK_NEXT_FLOAT_SIBLING,
51 BOX_WALK_FLOAT_CONTAINER
52};
53
54#define box_is_float(box)(box->type == BOX_FLOAT_LEFT || box->type == BOX_FLOAT_RIGHT
) (box->type == BOX_FLOAT_LEFT || \
55 box->type == BOX_FLOAT_RIGHT)
56
57/**
58 * Determine if a point lies within a box.
59 *
60 * \param[in] unit_len_ctx CSS length conversion context to use.
61 * \param[in] box Box to consider
62 * \param[in] x Coordinate relative to box
63 * \param[in] y Coordinate relative to box
64 * \param[out] physically If function returning true, physically is set true
65 * iff point is within the box's physical dimensions and
66 * false if the point is not within the box's physical
67 * dimensions but is in the area defined by the box's
68 * descendants. If function returns false, physically
69 * is undefined.
70 * \return true if the point is within the box or a descendant box
71 *
72 * This is a helper function for box_at_point().
73 */
74static bool_Bool
75box_contains_point(const css_unit_ctx *unit_len_ctx,
76 const struct box *box,
77 int x,
78 int y,
79 bool_Bool *physically)
80{
81 css_computed_clip_rect css_rect;
82
83 if (box->style != NULL((void*)0) &&
84 css_computed_position(box->style) == CSS_POSITION_ABSOLUTE &&
85 css_computed_clip(box->style, &css_rect) == CSS_CLIP_RECT) {
86 /* We have an absolutly positioned box with a clip rect */
87 struct rect r = {
88 .x0 = box->border[LEFT].width,
89 .y0 = box->border[TOP].width,
90 .x1 = box->padding[LEFT] + box->width +
91 box->border[RIGHT].width +
92 box->padding[RIGHT],
93 .y1 = box->padding[TOP] + box->height +
94 box->border[BOTTOM].width +
95 box->padding[BOTTOM]
96 };
97 if (x >= r.x0 && x < r.x1 && y >= r.y0 && y < r.y1) {
98 *physically = true1;
99 } else {
100 *physically = false0;
101 }
102
103 /* Adjust rect to css clip region */
104 if (css_rect.left_auto == false0) {
105 r.x0 += FIXTOINT(css_unit_len2device_px(((css_unit_len2device_px( box->style, unit_len_ctx, css_rect
.left, css_rect.lunit)) >> 10)
106 box->style,((css_unit_len2device_px( box->style, unit_len_ctx, css_rect
.left, css_rect.lunit)) >> 10)
107 unit_len_ctx,((css_unit_len2device_px( box->style, unit_len_ctx, css_rect
.left, css_rect.lunit)) >> 10)
108 css_rect.left,((css_unit_len2device_px( box->style, unit_len_ctx, css_rect
.left, css_rect.lunit)) >> 10)
109 css_rect.lunit))((css_unit_len2device_px( box->style, unit_len_ctx, css_rect
.left, css_rect.lunit)) >> 10);
110 }
111 if (css_rect.top_auto == false0) {
112 r.y0 += FIXTOINT(css_unit_len2device_px(((css_unit_len2device_px( box->style, unit_len_ctx, css_rect
.top, css_rect.tunit)) >> 10)
113 box->style,((css_unit_len2device_px( box->style, unit_len_ctx, css_rect
.top, css_rect.tunit)) >> 10)
114 unit_len_ctx,((css_unit_len2device_px( box->style, unit_len_ctx, css_rect
.top, css_rect.tunit)) >> 10)
115 css_rect.top,((css_unit_len2device_px( box->style, unit_len_ctx, css_rect
.top, css_rect.tunit)) >> 10)
116 css_rect.tunit))((css_unit_len2device_px( box->style, unit_len_ctx, css_rect
.top, css_rect.tunit)) >> 10);
117 }
118 if (css_rect.right_auto == false0) {
119 r.x1 = box->border[LEFT].width +
120 FIXTOINT(css_unit_len2device_px(((css_unit_len2device_px( box->style, unit_len_ctx, css_rect
.right, css_rect.runit)) >> 10)
121 box->style,((css_unit_len2device_px( box->style, unit_len_ctx, css_rect
.right, css_rect.runit)) >> 10)
122 unit_len_ctx,((css_unit_len2device_px( box->style, unit_len_ctx, css_rect
.right, css_rect.runit)) >> 10)
123 css_rect.right,((css_unit_len2device_px( box->style, unit_len_ctx, css_rect
.right, css_rect.runit)) >> 10)
124 css_rect.runit))((css_unit_len2device_px( box->style, unit_len_ctx, css_rect
.right, css_rect.runit)) >> 10);
125 }
126 if (css_rect.bottom_auto == false0) {
127 r.y1 = box->border[TOP].width +
128 FIXTOINT(css_unit_len2device_px(((css_unit_len2device_px( box->style, unit_len_ctx, css_rect
.bottom, css_rect.bunit)) >> 10)
129 box->style,((css_unit_len2device_px( box->style, unit_len_ctx, css_rect
.bottom, css_rect.bunit)) >> 10)
130 unit_len_ctx,((css_unit_len2device_px( box->style, unit_len_ctx, css_rect
.bottom, css_rect.bunit)) >> 10)
131 css_rect.bottom,((css_unit_len2device_px( box->style, unit_len_ctx, css_rect
.bottom, css_rect.bunit)) >> 10)
132 css_rect.bunit))((css_unit_len2device_px( box->style, unit_len_ctx, css_rect
.bottom, css_rect.bunit)) >> 10);
133 }
134
135 /* Test if point is in clipped box */
136 if (x >= r.x0 && x < r.x1 && y >= r.y0 && y < r.y1) {
137 /* inside clip area */
138 return true1;
139 }
140
141 /* Not inside clip area */
142 return false0;
143 }
144 if (x >= -box->border[LEFT].width &&
145 x < box->padding[LEFT] + box->width +
146 box->padding[RIGHT] + box->border[RIGHT].width &&
147 y >= -box->border[TOP].width &&
148 y < box->padding[TOP] + box->height +
149 box->padding[BOTTOM] + box->border[BOTTOM].width) {
150 *physically = true1;
151 return true1;
152 }
153 if (box->list_marker && box->list_marker->x - box->x <= x +
154 box->list_marker->border[LEFT].width &&
155 x < box->list_marker->x - box->x +
156 box->list_marker->padding[LEFT] +
157 box->list_marker->width +
158 box->list_marker->border[RIGHT].width +
159 box->list_marker->padding[RIGHT] &&
160 box->list_marker->y - box->y <= y +
161 box->list_marker->border[TOP].width &&
162 y < box->list_marker->y - box->y +
163 box->list_marker->padding[TOP] +
164 box->list_marker->height +
165 box->list_marker->border[BOTTOM].width +
166 box->list_marker->padding[BOTTOM]) {
167 *physically = true1;
168 return true1;
169 }
170 if ((box->style && css_computed_overflow_x(box->style) ==
171 CSS_OVERFLOW_VISIBLE) || !box->style) {
172 if (box->descendant_x0 <= x &&
173 x < box->descendant_x1) {
174 *physically = false0;
175 return true1;
176 }
177 }
178 if ((box->style && css_computed_overflow_y(box->style) ==
179 CSS_OVERFLOW_VISIBLE) || !box->style) {
180 if (box->descendant_y0 <= y &&
181 y < box->descendant_y1) {
182 *physically = false0;
183 return true1;
184 }
185 }
186 return false0;
187}
188
189
190/**
191 * Move from box to next box in given direction, adjusting for box coord change
192 *
193 * \param b box to move from from
194 * \param dir direction to move in
195 * \param x box's global x-coord, updated to position of next box
196 * \param y box's global y-coord, updated to position of next box
197 *
198 * If no box can be found in given direction, NULL is returned.
199 */
200static inline struct box *
201box_move_xy(struct box *b, enum box_walk_dir dir, int *x, int *y)
202{
203 struct box *rb = NULL((void*)0);
204
205 switch (dir) {
206 case BOX_WALK_CHILDREN:
207 b = b->children;
208 if (b == NULL((void*)0))
209 break;
210 *x += b->x;
211 *y += b->y;
212 if (!box_is_float(b)(b->type == BOX_FLOAT_LEFT || b->type == BOX_FLOAT_RIGHT
)) {
213 rb = b;
214 break;
215 }
216 fallthrough__attribute__((__fallthrough__));
217
218 case BOX_WALK_NEXT_SIBLING:
219 do {
220 *x -= b->x;
221 *y -= b->y;
222 b = b->next;
223 if (b == NULL((void*)0))
224 break;
225 *x += b->x;
226 *y += b->y;
227 } while (box_is_float(b)(b->type == BOX_FLOAT_LEFT || b->type == BOX_FLOAT_RIGHT
));
228 rb = b;
229 break;
230
231 case BOX_WALK_PARENT:
232 *x -= b->x;
233 *y -= b->y;
234 rb = b->parent;
235 break;
236
237 case BOX_WALK_FLOAT_CHILDREN:
238 b = b->float_children;
239 if (b == NULL((void*)0))
240 break;
241 *x += b->x;
242 *y += b->y;
243 rb = b;
244 break;
245
246 case BOX_WALK_NEXT_FLOAT_SIBLING:
247 *x -= b->x;
248 *y -= b->y;
249 b = b->next_float;
250 if (b == NULL((void*)0))
251 break;
252 *x += b->x;
253 *y += b->y;
254 rb = b;
255 break;
256
257 case BOX_WALK_FLOAT_CONTAINER:
258 *x -= b->x;
259 *y -= b->y;
260 rb = b->float_container;
261 break;
262
263 default:
264 assert(0 && "Bad box walk type.")((0 && "Bad box walk type.") ? (void) (0) : __assert_fail
("0 && \"Bad box walk type.\"", "content/handlers/html/box_inspect.c"
, 264, __extension__ __PRETTY_FUNCTION__));
265 }
266
267 return rb;
268}
269
270
271/**
272 * Itterator for walking to next box in interaction order
273 *
274 * \param b box to find next box from
275 * \param x box's global x-coord, updated to position of next box
276 * \param y box's global y-coord, updated to position of next box
277 * \param skip_children whether to skip box's children
278 *
279 * This walks to a boxes float children before its children. When walking
280 * children, floating boxes are skipped.
281 */
282static inline struct box *
283box_next_xy(struct box *b, int *x, int *y, bool_Bool skip_children)
284{
285 struct box *n;
286 int tx, ty;
287
288 assert(b != NULL)((b != ((void*)0)) ? (void) (0) : __assert_fail ("b != NULL",
"content/handlers/html/box_inspect.c", 288, __extension__ __PRETTY_FUNCTION__
));
289
290 if (skip_children) {
291 /* Caller is not interested in any kind of children */
292 goto skip_children;
293 }
294
295 tx = *x; ty = *y;
296 n = box_move_xy(b, BOX_WALK_FLOAT_CHILDREN, &tx, &ty);
297 if (n) {
298 /* Next node is float child */
299 *x = tx;
300 *y = ty;
301 return n;
302 }
303 done_float_children:
304
305 tx = *x; ty = *y;
306 n = box_move_xy(b, BOX_WALK_CHILDREN, &tx, &ty);
307 if (n) {
308 /* Next node is child */
309 *x = tx;
310 *y = ty;
311 return n;
312 }
313
314 skip_children:
315 tx = *x; ty = *y;
316 n = box_move_xy(b, BOX_WALK_NEXT_FLOAT_SIBLING, &tx, &ty);
317 if (n) {
318 /* Go to next float sibling */
319 *x = tx;
320 *y = ty;
321 return n;
322 }
323
324 if (box_is_float(b)(b->type == BOX_FLOAT_LEFT || b->type == BOX_FLOAT_RIGHT
)) {
325 /* Done floats, but the float container may have children,
326 * or siblings, or ansestors with siblings. Change to
327 * float container and move past handling its float children.
328 */
329 b = box_move_xy(b, BOX_WALK_FLOAT_CONTAINER, x, y);
330 goto done_float_children;
331 }
332
333 /* Go to next sibling, or nearest ancestor with next sibling. */
334 while (b) {
335 while (!b->next && b->parent) {
336 b = box_move_xy(b, BOX_WALK_PARENT, x, y);
337 if (box_is_float(b)(b->type == BOX_FLOAT_LEFT || b->type == BOX_FLOAT_RIGHT
)) {
338 /* Go on to next float, if there is one */
339 goto skip_children;
340 }
341 }
342 if (!b->next) {
343 /* No more boxes */
344 return NULL((void*)0);
345 }
346
347 tx = *x; ty = *y;
348 n = box_move_xy(b, BOX_WALK_NEXT_SIBLING, &tx, &ty);
349 if (n) {
350 /* Go to non-float (ancestor) sibling */
351 *x = tx;
352 *y = ty;
353 return n;
354
355 } else if (b->parent) {
356 b = box_move_xy(b, BOX_WALK_PARENT, x, y);
357 if (box_is_float(b)(b->type == BOX_FLOAT_LEFT || b->type == BOX_FLOAT_RIGHT
)) {
358 /* Go on to next float, if there is one */
359 goto skip_children;
360 }
361
362 } else {
363 /* No more boxes */
364 return NULL((void*)0);
365 }
366 }
367
368 assert(b != NULL)((b != ((void*)0)) ? (void) (0) : __assert_fail ("b != NULL",
"content/handlers/html/box_inspect.c", 368, __extension__ __PRETTY_FUNCTION__
));
369 return NULL((void*)0);
370}
371
372
373/**
374 * Check whether box is nearer mouse coordinates than current nearest box
375 *
376 * \param box box to test
377 * \param bx position of box, in global document coordinates
378 * \param by position of box, in global document coordinates
379 * \param x mouse point, in global document coordinates
380 * \param y mouse point, in global document coordinates
381 * \param dir direction in which to search (-1 = above-left,
382 * +1 = below-right)
383 * \param nearest nearest text box found, or NULL if none
384 * updated if box is nearer than existing nearest
385 * \param tx position of text_box, in global document coordinates
386 * updated if box is nearer than existing nearest
387 * \param ty position of text_box, in global document coordinates
388 * updated if box is nearer than existing nearest
389 * \param nr_xd distance to nearest text box found
390 * updated if box is nearer than existing nearest
391 * \param nr_yd distance to nearest text box found
392 * updated if box is nearer than existing nearest
393 * \return true if mouse point is inside box
394 */
395static bool_Bool
396box_nearer_text_box(struct box *box,
397 int bx, int by,
398 int x, int y,
399 int dir,
400 struct box **nearest,
401 int *tx, int *ty,
402 int *nr_xd, int *nr_yd)
403{
404 int w = box->padding[LEFT] + box->width + box->padding[RIGHT];
405 int h = box->padding[TOP] + box->height + box->padding[BOTTOM];
406 int y1 = by + h;
407 int x1 = bx + w;
408 int yd = INT_MAX2147483647;
409 int xd = INT_MAX2147483647;
410
411 if (x >= bx && x1 > x && y >= by && y1 > y) {
412 *nearest = box;
413 *tx = bx;
414 *ty = by;
415 return true1;
416 }
417
418 if (box->parent->list_marker != box) {
419 if (dir < 0) {
420 /* consider only those children (partly) above-left */
421 if (by <= y && bx < x) {
422 yd = y <= y1 ? 0 : y - y1;
423 xd = x <= x1 ? 0 : x - x1;
424 }
425 } else {
426 /* consider only those children (partly) below-right */
427 if (y1 > y && x1 > x) {
428 yd = y > by ? 0 : by - y;
429 xd = x > bx ? 0 : bx - x;
430 }
431 }
432
433 /* give y displacement precedence over x */
434 if (yd < *nr_yd || (yd == *nr_yd && xd <= *nr_xd)) {
435 *nr_yd = yd;
436 *nr_xd = xd;
437 *nearest = box;
438 *tx = bx;
439 *ty = by;
440 }
441 }
442 return false0;
443}
444
445
446/**
447 * Pick the text box child of 'box' that is closest to and above-left
448 * (dir -ve) or below-right (dir +ve) of the point 'x,y'
449 *
450 * \param box parent box
451 * \param bx position of box, in global document coordinates
452 * \param by position of box, in global document coordinates
453 * \param fx position of float parent, in global document coordinates
454 * \param fy position of float parent, in global document coordinates
455 * \param x mouse point, in global document coordinates
456 * \param y mouse point, in global document coordinates
457 * \param dir direction in which to search (-1 = above-left,
458 * +1 = below-right)
459 * \param nearest nearest text box found, or NULL if none
460 * updated if a descendant of box is nearer than old nearest
461 * \param tx position of nearest, in global document coordinates
462 * updated if a descendant of box is nearer than old nearest
463 * \param ty position of nearest, in global document coordinates
464 * updated if a descendant of box is nearer than old nearest
465 * \param nr_xd distance to nearest text box found
466 * updated if a descendant of box is nearer than old nearest
467 * \param nr_yd distance to nearest text box found
468 * updated if a descendant of box is nearer than old nearest
469 * \return true if mouse point is inside text_box
470 */
471static bool_Bool
472box_nearest_text_box(struct box *box,
473 int bx, int by,
474 int fx, int fy,
475 int x, int y,
476 int dir,
477 struct box **nearest,
478 int *tx, int *ty,
479 int *nr_xd, int *nr_yd)
480{
481 struct box *child = box->children;
482 int c_bx, c_by;
483 int c_fx, c_fy;
484 bool_Bool in_box = false0;
485
486 if (*nearest == NULL((void*)0)) {
5
←
Taking true branch
→
487 *nr_xd = INT_MAX2147483647 / 2; /* displacement of 'nearest so far' */
488 *nr_yd = INT_MAX2147483647 / 2;
489 }
490 if (box->type == BOX_INLINE_CONTAINER) {
6
←
Assuming field 'type' is not equal to BOX_INLINE_CONTAINER
→
7
←
Taking false branch
→
491 int bw = box->padding[LEFT] + box->width + box->padding[RIGHT];
492 int bh = box->padding[TOP] + box->height + box->padding[BOTTOM];
493 int b_y1 = by + bh;
494 int b_x1 = bx + bw;
495 if (x >= bx && b_x1 > x && y >= by && b_y1 > y) {
496 in_box = true1;
497 }
498 }
499
500 while (child) {
8
←
Loop condition is false. Execution continues on line 544
→
501 if (child->type == BOX_FLOAT_LEFT ||
502 child->type == BOX_FLOAT_RIGHT) {
503 c_bx = fx + child->x -
504 scrollbar_get_offset(child->scroll_x);
505 c_by = fy + child->y -
506 scrollbar_get_offset(child->scroll_y);
507 } else {
508 c_bx = bx + child->x -
509 scrollbar_get_offset(child->scroll_x);
510 c_by = by + child->y -
511 scrollbar_get_offset(child->scroll_y);
512 }
513 if (child->float_children) {
514 c_fx = c_bx;
515 c_fy = c_by;
516 } else {
517 c_fx = fx;
518 c_fy = fy;
519 }
520 if (in_box && child->text && !child->object) {
521 if (box_nearer_text_box(child,
522 c_bx, c_by, x, y, dir, nearest,
523 tx, ty, nr_xd, nr_yd))
524 return true1;
525 } else {
526 if (child->list_marker) {
527 if (box_nearer_text_box(
528 child->list_marker,
529 c_bx + child->list_marker->x,
530 c_by + child->list_marker->y,
531 x, y, dir, nearest,
532 tx, ty, nr_xd, nr_yd))
533 return true1;
534 }
535 if (box_nearest_text_box(child, c_bx, c_by,
536 c_fx, c_fy,
537 x, y, dir, nearest, tx, ty,
538 nr_xd, nr_yd))
539 return true1;
540 }
541 child = child->next;
542 }
543
544 return false0;
9
←
Returning without writing to '*tx'
→
545}
546
547
548/* Exported function documented in html/box.h */
549void box_coords(struct box *box, int *x, int *y)
550{
551 *x = box->x;
552 *y = box->y;
553 while (box->parent) {
554 if (box_is_float(box)(box->type == BOX_FLOAT_LEFT || box->type == BOX_FLOAT_RIGHT
)) {
555 assert(box->float_container)((box->float_container) ? (void) (0) : __assert_fail ("box->float_container"
, "content/handlers/html/box_inspect.c", 555, __extension__ __PRETTY_FUNCTION__
));
556 box = box->float_container;
557 } else {
558 box = box->parent;
559 }
560 *x += box->x - scrollbar_get_offset(box->scroll_x);
561 *y += box->y - scrollbar_get_offset(box->scroll_y);
562 }
563}
564
565
566/* Exported function documented in html/box.h */
567void box_bounds(struct box *box, struct rect *r)
568{
569 int width, height;
570
571 box_coords(box, &r->x0, &r->y0);
572
573 width = box->padding[LEFT] + box->width + box->padding[RIGHT];
574 height = box->padding[TOP] + box->height + box->padding[BOTTOM];
575
576 r->x1 = r->x0 + width;
577 r->y1 = r->y0 + height;
578}
579
580
581/* Exported function documented in html/box.h */
582struct box *
583box_at_point(const css_unit_ctx *unit_len_ctx,
584 struct box *box,
585 const int x, const int y,
586 int *box_x, int *box_y)
587{
588 bool_Bool skip_children;
589 bool_Bool physically;
590
591 assert(box)((box) ? (void) (0) : __assert_fail ("box", "content/handlers/html/box_inspect.c"
, 591, __extension__ __PRETTY_FUNCTION__));
592
593 skip_children = false0;
594 while ((box = box_next_xy(box, box_x, box_y, skip_children))) {
595 if (box_contains_point(unit_len_ctx, box, x - *box_x, y - *box_y,
596 &physically)) {
597 *box_x -= scrollbar_get_offset(box->scroll_x);
598 *box_y -= scrollbar_get_offset(box->scroll_y);
599
600 if (physically)
601 return box;
602
603 skip_children = false0;
604 } else {
605 skip_children = true1;
606 }
607 }
608
609 return NULL((void*)0);
610}
611
612
613/* Exported function documented in html/box.h */
614struct box *box_find_by_id(struct box *box, lwc_string *id)
615{
616 struct box *a, *b;
617 bool_Bool m;
618
619 if (box->id != NULL((void*)0) &&
620 lwc_string_isequal(id, box->id, &m)((*(&m) = ((id) == (box->id))), lwc_error_ok) == lwc_error_ok &&
621 m == true1) {
622 return box;
623 }
624
625 for (a = box->children; a; a = a->next) {
626 if ((b = box_find_by_id(a, id)) != NULL((void*)0)) {
627 return b;
628 }
629 }
630
631 return NULL((void*)0);
632}
633
634
635/* Exported function documented in html/box.h */
636bool_Bool box_visible(struct box *box)
637{
638 /* visibility: hidden */
639 if (box->style &&
640 css_computed_visibility(box->style) == CSS_VISIBILITY_HIDDEN) {
641 return false0;
642 }
643
644 return true1;
645}
646
647
648/* Exported function documented in html/box.h */
649void box_dump(FILE *stream, struct box *box, unsigned int depth, bool_Bool style)
650{
651 unsigned int i;
652 struct box *c, *prev;
653
654 for (i = 0; i != depth; i++) {
655 fprintf(stream, " ");
656 }
657
658 fprintf(stream, "%p ", box);
659 fprintf(stream, "x%i y%i w%i h%i ",
660 box->x, box->y, box->width, box->height);
661 if (box->max_width != UNKNOWN_MAX_WIDTH2147483647) {
662 fprintf(stream, "min%i max%i ", box->min_width, box->max_width);
663 }
664 fprintf(stream, "desc(%i %i %i %i) ",
665 box->descendant_x0, box->descendant_y0,
666 box->descendant_x1, box->descendant_y1);
667
668 fprintf(stream, "m(%i %i %i %i) ",
669 box->margin[TOP], box->margin[LEFT],
670 box->margin[BOTTOM], box->margin[RIGHT]);
671
672 switch (box->type) {
673 case BOX_BLOCK:
674 fprintf(stream, "BLOCK ");
675 break;
676
677 case BOX_INLINE_CONTAINER:
678 fprintf(stream, "INLINE_CONTAINER ");
679 break;
680
681 case BOX_INLINE:
682 fprintf(stream, "INLINE ");
683 break;
684
685 case BOX_INLINE_END:
686 fprintf(stream, "INLINE_END ");
687 break;
688
689 case BOX_INLINE_BLOCK:
690 fprintf(stream, "INLINE_BLOCK ");
691 break;
692
693 case BOX_TABLE:
694 fprintf(stream, "TABLE [columns %i] ", box->columns);
695 break;
696
697 case BOX_TABLE_ROW:
698 fprintf(stream, "TABLE_ROW ");
699 break;
700
701 case BOX_TABLE_CELL:
702 fprintf(stream, "TABLE_CELL [columns %i, start %i, rows %i] ",
703 box->columns,
704 box->start_column,
705 box->rows);
706 break;
707
708 case BOX_TABLE_ROW_GROUP:
709 fprintf(stream, "TABLE_ROW_GROUP ");
710 break;
711
712 case BOX_FLOAT_LEFT:
713 fprintf(stream, "FLOAT_LEFT ");
714 break;
715
716 case BOX_FLOAT_RIGHT:
717 fprintf(stream, "FLOAT_RIGHT ");
718 break;
719
720 case BOX_BR:
721 fprintf(stream, "BR ");
722 break;
723
724 case BOX_TEXT:
725 fprintf(stream, "TEXT ");
726 break;
727
728 case BOX_FLEX:
729 fprintf(stream, "FLEX ");
730 break;
731
732 case BOX_INLINE_FLEX:
733 fprintf(stream, "INLINE_FLEX ");
734 break;
735
736 default:
737 fprintf(stream, "Unknown box type ");
738 }
739
740 if (box->text)
741 fprintf(stream, "%li '%.*s' ", (unsigned long) box->byte_offset,
742 (int) box->length, box->text);
743 if (box->space)
744 fprintf(stream, "space ");
745 if (box->object) {
746 fprintf(stream, "(object '%s') ",
747 nsurl_access(hlcache_handle_get_url(box->object)));
748 }
749 if (box->iframe) {
750 fprintf(stream, "(iframe) ");
751 }
752 if (box->gadget)
753 fprintf(stream, "(gadget) ");
754 if (style && box->style)
755 nscss_dump_computed_style(stream, box->style);
756 if (box->href)
757 fprintf(stream, " -> '%s'", nsurl_access(box->href));
758 if (box->target)
759 fprintf(stream, " |%s|", box->target);
760 if (box->title)
761 fprintf(stream, " [%s]", box->title);
762 if (box->id)
763 fprintf(stream, " ID:%s", lwc_string_data(box->id)({((box->id != ((void*)0)) ? (void) (0) : __assert_fail ("box->id != NULL"
, "content/handlers/html/box_inspect.c", 763, __extension__ __PRETTY_FUNCTION__
)); (const char *)((box->id)+1);}));
764 if (box->type == BOX_INLINE || box->type == BOX_INLINE_END)
765 fprintf(stream, " inline_end %p", box->inline_end);
766 if (box->float_children)
767 fprintf(stream, " float_children %p", box->float_children);
768 if (box->next_float)
769 fprintf(stream, " next_float %p", box->next_float);
770 if (box->float_container)
771 fprintf(stream, " float_container %p", box->float_container);
772 if (box->col) {
773 fprintf(stream, " (columns");
774 for (i = 0; i != box->columns; i++) {
775 fprintf(stream, " (%s %s %i %i %i)",
776 ((const char *[]) {
777 "UNKNOWN",
778 "FIXED",
779 "AUTO",
780 "PERCENT",
781 "RELATIVE"
782 })
783 [box->col[i].type],
784 ((const char *[]) {
785 "normal",
786 "positioned"})
787 [box->col[i].positioned],
788 box->col[i].width,
789 box->col[i].min, box->col[i].max);
790 }
791 fprintf(stream, ")");
792 }
793 if (box->node != NULL((void*)0)) {
794 dom_string *name;
795 if (dom_node_get_node_name(box->node, &name)dom_node_get_node_name((dom_node *) (box->node), (&name
)) == DOM_NO_ERR) {
796 fprintf(stream, " <%s>", dom_string_data(name));
797 dom_string_unref(name);
798 }
799 }
800 fprintf(stream, "\n");
801
802 if (box->list_marker) {
803 for (i = 0; i != depth; i++)
804 fprintf(stream, " ");
805 fprintf(stream, "list_marker:\n");
806 box_dump(stream, box->list_marker, depth + 1, style);
807 }
808
809 for (c = box->children; c && c->next; c = c->next)
810 ;
811 if (box->last != c)
812 fprintf(stream, "warning: box->last %p (should be %p) "
813 "(box %p)\n", box->last, c, box);
814 for (prev = 0, c = box->children; c; prev = c, c = c->next) {
815 if (c->parent != box)
816 fprintf(stream, "warning: box->parent %p (should be "
817 "%p) (box on next line)\n",
818 c->parent, box);
819 if (c->prev != prev)
820 fprintf(stream, "warning: box->prev %p (should be "
821 "%p) (box on next line)\n",
822 c->prev, prev);
823 box_dump(stream, c, depth + 1, style);
824 }
825}
826
827
828/* exported interface documented in html/box.h */
829bool_Bool box_vscrollbar_present(const struct box * const box)
830{
831 return box->padding[TOP] +
832 box->height +
833 box->padding[BOTTOM] +
834 box->border[BOTTOM].width < box->descendant_y1;
835}
836
837
838/* exported interface documented in html/box.h */
839bool_Bool box_hscrollbar_present(const struct box * const box)
840{
841 return box->padding[LEFT] +
842 box->width +
843 box->padding[RIGHT] +
844 box->border[RIGHT].width < box->descendant_x1;
845}
846
847
848/* Exported function documented in html/box.h */
849struct box *
850box_pick_text_box(struct html_content *html,
851 int x, int y,
852 int dir,
853 int *dx, int *dy)
854{
855 struct box *text_box = NULL((void*)0);
856 struct box *box;
857 int nr_xd, nr_yd;
858 int bx, by;
859 int fx, fy;
860 int tx, ty;
1
'tx' declared without an initial value
→
861
862 if (html == NULL((void*)0))
2
←
Assuming 'html' is not equal to NULL
→
3
←
Taking false branch
→
863 return NULL((void*)0);
864
865 box = html->layout;
866 bx = box->margin[LEFT];
867 by = box->margin[TOP];
868 fx = bx;
869 fy = by;
870
871 if (!box_nearest_text_box(box, bx, by, fx, fy, x, y,
4
←
Calling 'box_nearest_text_box'
→
10
←
Returning from 'box_nearest_text_box'
→
872 dir, &text_box, &tx, &ty, &nr_xd, &nr_yd)) {
873 if (text_box
10.1
'text_box' is null
 && text_box->text && !text_box->object) {
874 int w = (text_box->padding[LEFT] +
875 text_box->width +
876 text_box->padding[RIGHT]);
877 int h = (text_box->padding[TOP] +
878 text_box->height +
879 text_box->padding[BOTTOM]);
880 int x1, y1;
881
882 y1 = ty + h;
883 x1 = tx + w;
884
885 /* ensure point lies within the text box */
886 if (x < tx) x = tx;
887 if (y < ty) y = ty;
888 if (y > y1) y = y1;
889 if (x > x1) x = x1;
890 }
891 }
892
893 /* return coordinates relative to box */
894 *dx = x - tx;
11
←
The right operand of '-' is a garbage value
895 *dy = y - ty;
896
897 return text_box;
898}