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libi3/root_atom_contents: handle data of arbitrary length 

Handle data fetched from xcb_get_property_unchecked with arbitrary
length. This avoids having to rely on PATH_MAX macro where it is not
necessary.
This commit is contained in:
Lancelot SIX 2013-11-23 12:03:55 +01:00 committed by Michael Stapelberg
parent 2eea82eb02
commit eca5e4598a
2 changed files with 18 additions and 2 deletions
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2
common.mk
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@ -144,7 +144,7 @@ PANGO_LIBS := $(call ldflags_for_lib, cairo)
PANGO_LIBS += $(call ldflags_for_lib, pangocairo)
# libi3
LIBS = -L$(TOPDIR) -li3
LIBS = -L$(TOPDIR) -li3 -lm
## Platform-specific flags

18
libi3/root_atom_contents.c
View File

@ -10,6 +10,7 @@
#include <stdbool.h>
#include <limits.h>
#include <stdlib.h>
#include <math.h>
#include <xcb/xcb.h>
#include <xcb/xcb_aux.h>
@ -31,6 +32,7 @@ char *root_atom_contents(const char *atomname, xcb_connection_t *provided_conn,
xcb_intern_atom_cookie_t atom_cookie;
xcb_intern_atom_reply_t *atom_reply;
char *content;
size_t content_max_words = 256;
xcb_connection_t *conn = provided_conn;
if (provided_conn == NULL &&
@ -50,12 +52,26 @@ char *root_atom_contents(const char *atomname, xcb_connection_t *provided_conn,
xcb_get_property_cookie_t prop_cookie;
xcb_get_property_reply_t *prop_reply;
prop_cookie = xcb_get_property_unchecked(conn, false, root, atom_reply->atom,
XCB_GET_PROPERTY_TYPE_ANY, 0, PATH_MAX);
XCB_GET_PROPERTY_TYPE_ANY, 0, content_max_words);
prop_reply = xcb_get_property_reply(conn, prop_cookie, NULL);
if (prop_reply == NULL) {
free(atom_reply);
return NULL;
}
if (xcb_get_property_value_length(prop_reply) > 0 && prop_reply->bytes_after > 0) {
/* We received an incomplete value. Ask again but with a properly
* adjusted size. */
content_max_words += ceil(prop_reply->bytes_after / 4.0);
/* Repeat the request, with adjusted size */
free(prop_reply);
prop_cookie = xcb_get_property_unchecked(conn, false, root, atom_reply->atom,
XCB_GET_PROPERTY_TYPE_ANY, 0, content_max_words);
prop_reply = xcb_get_property_reply(conn, prop_cookie, NULL);
if (prop_reply == NULL) {
free(atom_reply);
return NULL;
}
}
if (xcb_get_property_value_length(prop_reply) == 0) {
free(atom_reply);
free(prop_reply);