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input_id: Add some debugging output

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If $DEBUG is set, output the capability bitmaps to stderr.
This commit is contained in:
Martin Pitt
2011-03-18 13:42:02 +01:00
parent 7a86845ba1
commit 941c40bdc4
1 changed files with 35 additions and 10 deletions
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45
extras/input_id/input_id.c
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@ -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)