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Fix pango escaping and refactor escape_markup_text

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Fixes #2674.

The cause of the issue was in get_pango_layout. When we call
pango_parse_markup, `text` is the escaped string, and the unescaped
string is then computed and written to `buf`. We were then passing the
unescaped string to pango_layout_set_markup, but this function needs the
escaped string. `buf` is not needed and has been removed.

The other part of this PR refactors escape_markup_text to remove the
dest_length argument and removes the -1 return value on error. It now
assumes that you've allocated dest to the correct length.
This commit is contained in:
Ryan Dwyer 2018-09-21 21:27:36 +10:00
parent fe7e66407c
commit 10ef118e09
3 changed files with 24 additions and 56 deletions
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57
common/pango.c
View file

@ -7,66 +7,45 @@
#include <stdlib.h>
#include <string.h>
#include "log.h"
#include "stringop.h"
int escape_markup_text(const char *src, char *dest, int dest_length) {
int length = 0;
size_t escape_markup_text(const char *src, char *dest) {
size_t length = 0;
if (dest) {
dest[0] = '\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;
}
lenient_strcat(dest, "&amp;");
break;
case '<':
length += 4;
if (dest && dest_length - length >= 0) {
dest += sprintf(dest, "%s", "&lt;");
} else {
dest_length = -1;
}
lenient_strcat(dest, "&lt;");
break;
case '>':
length += 4;
if (dest && dest_length - length >= 0) {
dest += sprintf(dest, "%s", "&gt;");
} else {
dest_length = -1;
}
lenient_strcat(dest, "&gt;");
break;
case '\'':
length += 6;
if (dest && dest_length - length >= 0) {
dest += sprintf(dest, "%s", "&apos;");
} else {
dest_length = -1;
}
lenient_strcat(dest, "&apos;");
break;
case '"':
length += 6;
if (dest && dest_length - length >= 0) {
dest += sprintf(dest, "%s", "&quot;");
} else {
dest_length = -1;
}
lenient_strcat(dest, "&quot;");
break;
default:
length += 1;
if (dest && dest_length - length >= 0) {
*(dest++) = *src;
} else {
dest_length = -1;
if (dest) {
dest[length] = *src;
dest[length + 1] = '\0';
}
length += 1;
}
src++;
}
// if we could not fit the escaped string in dest, return -1
if (dest && dest_length == -1) {
return -1;
}
return length;
}
@ -75,11 +54,9 @@ PangoLayout *get_pango_layout(cairo_t *cairo, const char *font,
PangoLayout *layout = pango_cairo_create_layout(cairo);
PangoAttrList *attrs;
if (markup) {
char *buf;
GError *error = NULL;
if (pango_parse_markup(text, -1, 0, &attrs, &buf, NULL, &error)) {
pango_layout_set_markup(layout, buf, -1);
free(buf);
if (pango_parse_markup(text, -1, 0, &attrs, NULL, NULL, &error)) {
pango_layout_set_markup(layout, text, -1);
} else {
wlr_log(WLR_ERROR, "pango_parse_markup '%s' -> error %s", text,
error->message);

14
include/pango.h
View file

@ -6,17 +6,13 @@
#include <cairo/cairo.h>
#include <pango/pangocairo.h>
/* Utility function which escape characters a & < > ' ".
/**
* 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.
* The function returns the length of the escaped string, optionally writing the
* escaped string to dest if provided.
*/
int escape_markup_text(const char *src, char *dest, int dest_length);
size_t escape_markup_text(const char *src, char *dest);
PangoLayout *get_pango_layout(cairo_t *cairo, const char *font,
const char *text, double scale, bool markup);
void get_text_size(cairo_t *cairo, const char *font, int *width, int *height,

9
sway/tree/view.c
View file

@ -785,14 +785,9 @@ static size_t parse_title_format(struct sway_view *view, char *buffer) {
}
static char *escape_title(char *buffer) {
int length = escape_markup_text(buffer, NULL, 0);
size_t length = escape_markup_text(buffer, NULL);
char *escaped_title = calloc(length + 1, sizeof(char));
int result = escape_markup_text(buffer, escaped_title, length);
if (result != length) {
wlr_log(WLR_ERROR, "Could not escape title: %s", buffer);
free(escaped_title);
return buffer;
}
escape_markup_text(buffer, escaped_title);
free(buffer);
return escaped_title;
}