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Fix crash when using pango markup font

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The characters & < > ' " needs to be escaped when using pango markup

Signed-off-by: Heghedus Razvan <heghedus.razvan@gmail.com>
This commit is contained in:
Heghedus Razvan 2018-05-07 19:30:45 +03:00 committed by Heghedus Razvan
parent 61aa0937a7
commit 789a877b37
3 changed files with 99 additions and 6 deletions
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73
common/pango.c
View file

@ -8,6 +8,68 @@
#include <string.h>
#include "log.h"
int escape_markup_text(const char *src, char *dest, int dest_length) {
int length = 0;
while (src[0]) {
switch (src[0]) {
case '&':
length += 5;
if (dest && dest_length - length >= 0) {
dest += sprintf(dest, "%s", "&amp;");
} else {
dest_length = -1;
}
break;
case '<':
length += 4;
if (dest && dest_length - length >= 0) {
dest += sprintf(dest, "%s", "&lt;");
} else {
dest_length = -1;
}
break;
case '>':
length += 4;
if (dest && dest_length - length >= 0) {
dest += sprintf(dest, "%s", "&gt;");
} else {
dest_length = -1;
}
break;
case '\'':
length += 6;
if (dest && dest_length - length >= 0) {
dest += sprintf(dest, "%s", "&apos;");
} else {
dest_length = -1;
}
break;
case '"':
length += 6;
if (dest && dest_length - length >= 0) {
dest += sprintf(dest, "%s", "&quot;");
} else {
dest_length = -1;
}
break;
default:
length += 1;
if (dest && dest_length - length >= 0) {
*(dest++) = *src;
} else {
dest_length = -1;
}
}
src++;
}
// if we could not fit the escaped string in dest, return -1
if (dest && dest_length == -1) {
return -1;
}
return length;
}
PangoLayout *get_pango_layout(cairo_t *cairo, const char *font,
const char *text, int32_t scale, bool markup) {
PangoLayout *layout = pango_cairo_create_layout(cairo);
@ -15,13 +77,14 @@ PangoLayout *get_pango_layout(cairo_t *cairo, const char *font,
if (markup) {
char *buf;
GError *error = NULL;
if (!sway_assert(pango_parse_markup(
text, -1, 0, &attrs, &buf, NULL, &error),
"pango_parse_markup '%s' -> error %s", text,
error ? error->message : NULL)) {
bool result = pango_parse_markup(text, -1, 0, &attrs, &buf,
NULL, &error);
if (result) {
wlr_log(L_ERROR, "pango_parse_markup '%s' -> error %s", text,
error->message);
return NULL;
}
pango_layout_set_markup(layout, buf, -1);
pango_layout_set_markup(layout, text, -1);
free(buf);
} else {
attrs = pango_attr_list_new();

11
include/pango.h
View file

@ -6,6 +6,17 @@
#include <cairo/cairo.h>
#include <pango/pangocairo.h>
/* Utility function which escape characters a & < > ' ".
*
* If the dest parameter is NULL, then the function returns the length of
* of the escaped src string. The dest_length doesn't matter.
*
* If the dest parameter is not NULL then the fuction escapes the src string
* an puts the escaped string in dest and returns the lenght of the escaped string.
* The dest_length parameter is the size of dest array. If the size of dest is not
* enough, then the function returns -1.
*/
int escape_markup_text(const char *src, char *dest, int dest_length);
PangoLayout *get_pango_layout(cairo_t *cairo, const char *font,
const char *text, int32_t scale, bool markup);
void get_text_size(cairo_t *cairo, const char *font, int *width, int *height,

21
sway/tree/view.c
View file

@ -14,6 +14,8 @@
#include "sway/tree/layout.h"
#include "sway/tree/view.h"
#include "sway/tree/workspace.h"
#include "sway/config.h"
#include "pango.h"
void view_init(struct sway_view *view, enum sway_view_type type,
const struct sway_view_impl *impl) {
@ -612,6 +614,19 @@ static size_t parse_title_format(struct sway_view *view, char *buffer) {
return len;
}
static char *escape_title(char *buffer) {
int length = escape_markup_text(buffer, NULL, 0);
char *escaped_title = calloc(length + 1, sizeof(char));
int result = escape_markup_text(buffer, escaped_title, length);
if (result != length) {
wlr_log(L_ERROR, "Could not escape title: %s", buffer);
free(escaped_title);
return buffer;
}
free(buffer);
return escaped_title;
}
void view_update_title(struct sway_view *view, bool force) {
if (!view->swayc) {
return;
@ -631,11 +646,15 @@ void view_update_title(struct sway_view *view, bool force) {
free(view->swayc->formatted_title);
if (title) {
size_t len = parse_title_format(view, NULL);
char *buffer = calloc(len + 1, 1);
char *buffer = calloc(len + 1, sizeof(char));
if (!sway_assert(buffer, "Unable to allocate title string")) {
return;
}
parse_title_format(view, buffer);
// now we have the title, but needs to be escaped when using pango markup
if (config->pango_markup) {
buffer = escape_title(buffer);
}
view->swayc->name = strdup(title);
view->swayc->formatted_title = buffer;