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authorMattias Andrée <maandree@operamail.com>2014-04-02 14:03:15 +0200
committerMattias Andrée <maandree@operamail.com>2014-04-02 14:03:15 +0200
commit5123dd8d66a28a7bf5ca6fb2ed684492edb7e4b1 (patch)
tree43835df9968de3a4aaba5077378e3a439b29648f
parentm + document (diff)
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document
Signed-off-by: Mattias Andrée <maandree@operamail.com>
Diffstat (limited to '')
-rw-r--r--src/blueshift_idcrtc.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/src/blueshift_idcrtc.c b/src/blueshift_idcrtc.c
index 71206f2..978a71d 100644
--- a/src/blueshift_idcrtc.c
+++ b/src/blueshift_idcrtc.c
@@ -269,29 +269,40 @@ int main(int argc, char** argv)
char* atom_name_;
int atom_name_len;
+ /* Acuire the atom name. */
atom_name_cookie = xcb_get_atom_name(connection, *atoms);
atom_name_reply = xcb_get_atom_name_reply(connection, atom_name_cookie, &error);
if (error)
{
+ /* On error print an error message, */
fprintf(stderr, "RandR atom name query returned %i\n", error->error_code);
+ /* and release the property list, */
free(prop_reply);
+ /* the output information resources */
free(out_reply);
+ /* and the screen information resources. */
free(res_reply);
+ /* And then close the connection to the display. */
xcb_disconnect(connection);
return 1;
}
+ /* Extract the atom name from the data structure that holds it. */
atom_name_ = xcb_get_atom_name_name(atom_name_reply);
+ /* As well as the length of the name; it is not NUL-termianted.*/
atom_name_len = xcb_get_atom_name_name_length(atom_name_reply);
+ /* NUL-terminate the atom name. */
atom_name = alloca((atom_name_len + 1) * sizeof(char));
memcpy(atom_name, atom_name_, atom_name_len * sizeof(char));
*(atom_name + atom_name_len) = 0;
+ /* (It is allocated on the stack, so it should not be free:d.) */
/* Get output identifier */
+ /* Look for the the property named EDID. */
if (!strcmp(atom_name, "EDID"))
{
xcb_randr_get_output_property_cookie_t atom_cookie;
@@ -300,6 +311,7 @@ int main(int argc, char** argv)
unsigned char* atom_data_;
char* atom_data;
+ /* Acquire the property's value, we know that it is 128 byte long. */
atom_cookie = xcb_randr_get_output_property(connection, outputs[output_i], *atoms,
XCB_GET_PROPERTY_TYPE_ANY, 0, 128, 0, 0);
@@ -307,28 +319,40 @@ int main(int argc, char** argv)
if (error)
{
+ /* On error print an error message, */
fprintf(stderr, "RandR atom data query returned %i\n", error->error_code);
+ /* and release the property name, */
free(atom_name_reply);
+ /* release the property list, */
free(prop_reply);
+ /* the output information resources */
free(out_reply);
+ /* and the screen information resources. */
free(res_reply);
+ /* And then close the connection to the display. */
xcb_disconnect(connection);
return 1;
}
+ /* Extract the property's value, */
atom_data_ = xcb_randr_get_output_property_data(atom_reply);
+ /* and its actual length, it is still probably 128 byte, it should be that. */
length = xcb_randr_get_output_property_data_length(atom_reply);
+ /* Convert to hexadecimal representation. */
atom_data = alloca((2 * length + 1) * sizeof(char));
for (i = 0; i < length; i++)
{
*(atom_data + i * 2 + 0) = "0123456789abcdef"[(*(atom_data_ + i) >> 4) & 15];
*(atom_data + i * 2 + 1) = "0123456789abcdef"[(*(atom_data_ + i) >> 0) & 15];
}
+ /* NUL-terminate. */
*(atom_data + 2 * length) = 0;
+ /* Print the property's name and values. */
printf(" %s: %s\n", atom_name, atom_data);
+ /* Free the proprty value. */
free(atom_reply);
}