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Avoid floating point arithmetic while calculating iquiry length.

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Submitted by:	Iain Hibbert < plunky -at- rya-online -dot- net >
MFC after:	1 week
This commit is contained in:
Maksim Yevmenkin 2009-05-14 17:10:19 +00:00
parent a72778d6fa
commit b7ced94c8c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=192113
1 changed files with 14 additions and 11 deletions
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25
lib/libbluetooth/hci.c
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@ -410,7 +410,6 @@ bt_devinquiry(char const *devname, time_t length, int num_rsp,
ng_hci_inquiry_response *ir;
struct bt_devinquiry *i;
int s, n;
time_t to;
if (ii == NULL) {
errno = EINVAL;
@ -452,16 +451,20 @@ bt_devinquiry(char const *devname, time_t length, int num_rsp,
cp->lap[1] = 0x8b;
cp->lap[2] = 0x9e;
/* Calculate inquire length in 1.28 second units */
to = (time_t) ((double) length / 1.28);
if (to <= 0)
cp->inquiry_length = 4; /* 5.12 seconds */
else if (to > 254)
cp->inquiry_length = 255; /* 326.40 seconds */
else
cp->inquiry_length = to + 1;
/*
* Calculate inquire length in 1.28 second units
* v2.x specification says that 1.28 -> 61.44 seconds
* range is acceptable
*/
to = (time_t)((double) cp->inquiry_length * 1.28) + 1;
if (length <= 0)
length = 5;
else if (length == 1)
length = 2;
else if (length > 62)
length = 62;
cp->inquiry_length = (uint8_t)((length * 100) / 128);
if (num_rsp <= 0 || num_rsp > 255)
num_rsp = 8;
@ -484,7 +487,7 @@ bt_devinquiry(char const *devname, time_t length, int num_rsp,
wait_for_more:
n = bt_devrecv(s, buf, sizeof(buf), to);
n = bt_devrecv(s, buf, sizeof(buf), length);
if (n < 0) {
free(i);
bt_devclose(s);