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authorMartin Pitt <martin.pitt@ubuntu.com>2011-03-18 13:42:02 +0100
committerMartin Pitt <martin.pitt@ubuntu.com>2011-03-18 13:42:02 +0100
commit941c40bdc47d1fdee651558dd0e162cd8d674fab (patch)
tree83572b85637e0168ea0ae3e4b1cd3b38a5ec8b71 /extras
parent7a86845ba10782da3052506095cd591c1fc6cf96 (diff)
input_id: Add some debugging output
If $DEBUG is set, output the capability bitmaps to stderr.
Diffstat (limited to 'extras')
-rw-r--r--extras/input_id/input_id.c45
1 files changed, 35 insertions, 10 deletions
diff --git a/extras/input_id/input_id.c b/extras/input_id/input_id.c
index 85664ab479..20191599d1 100644
--- a/extras/input_id/input_id.c
+++ b/extras/input_id/input_id.c
@@ -36,23 +36,28 @@
#define LONG(x) ((x)/BITS_PER_LONG)
#define test_bit(bit, array) ((array[LONG(bit)] >> OFF(bit)) & 1)
+static int debug = 0;
+#define DBG(format, args...) { if (debug) fprintf(stderr, format, ##args); }
+
/*
* Read a capability attribute and return bitmask.
* @param dev udev_device
* @param attr sysfs attribute name (e. g. "capabilities/key")
- * @param bitmask: Output array; must have max_size elements
+ * @param bitmask: Output array which has a sizeof of bitmask_size
*/
static void get_cap_mask (struct udev_device *dev, const char* attr,
- unsigned long *bitmask, size_t max_size)
+ unsigned long *bitmask, size_t bitmask_size)
{
char text[4096];
- int i;
+ unsigned i;
char* word;
unsigned long val;
snprintf(text, sizeof(text), "%s", udev_device_get_sysattr_value(dev, attr));
- memset (bitmask, 0, max_size);
+ DBG("%s raw kernel attribute: %s\n", attr, text);
+
+ memset (bitmask, 0, bitmask_size);
i = 0;
while ((word = strrchr(text, ' ')) != NULL) {
val = strtoul (word+1, NULL, 16);
@@ -62,6 +67,18 @@ static void get_cap_mask (struct udev_device *dev, const char* attr,
}
val = strtoul (text, NULL, 16);
bitmask[i] = val;
+
+ if (debug) {
+ /* printf pattern with the right unsigned long number of hex chars */
+ snprintf(text, sizeof(text), " bit %%4u: %%0%zilX\n", 2*sizeof(unsigned long));
+ DBG("%s decoded bit map:\n", attr);
+ val = bitmask_size/sizeof (unsigned long);
+ /* skip over leading zeros */
+ while (bitmask[val-1] == 0 && val > 0)
+ --val;
+ for (i = 0; i < val; ++i)
+ DBG(text, i * BITS_PER_LONG, bitmask[i]);
+ }
}
/* pointer devices */
@@ -110,17 +127,22 @@ static void test_key (const unsigned long* bitmask_ev,
const unsigned long* bitmask_key)
{
unsigned i;
- unsigned long acc;
+ unsigned long found;
unsigned long mask;
/* do we have any KEY_* capability? */
- if (!test_bit (EV_KEY, bitmask_ev))
+ if (!test_bit (EV_KEY, bitmask_ev)) {
+ DBG("test_key: no EV_KEY capability\n");
return;
+ }
- acc = 0;
- for (i = 0; i < BTN_MISC/BITS_PER_LONG; ++i)
- acc |= bitmask_key[i];
- if (acc > 0)
+ /* only consider KEY_* here, not BTN_* */
+ found = 0;
+ for (i = 0; i < BTN_MISC/BITS_PER_LONG; ++i) {
+ found |= bitmask_key[i];
+ DBG("test_key: checking bit block %lu for any keys; found=%i\n", i*BITS_PER_LONG, found > 0);
+ }
+ if (found > 0)
puts("ID_INPUT_KEY=1");
/* the first 32 bits are ESC, numbers, and Q to D; if we have all of
@@ -146,6 +168,9 @@ int main (int argc, char** argv)
exit(1);
}
+ if (getenv ("DEBUG"))
+ debug = 1;
+
/* get the device */
udev = udev_new();
if (udev == NULL)