Benny Prijono | 4766ffe | 2005-11-01 17:56:59 +0000 | [diff] [blame] | 1 | /* $Id$ |
| 2 | * |
Benny Prijono | dd859a6 | 2005-11-01 16:42:51 +0000 | [diff] [blame] | 3 | */ |
| 4 | #include <pj/guid.h> |
| 5 | #include <pj/os.h> |
| 6 | #include <pj/rand.h> |
| 7 | #include <pj/string.h> |
| 8 | #include <pj/compat/sprintf.h> |
| 9 | |
| 10 | const unsigned PJ_GUID_STRING_LENGTH=20; |
| 11 | |
| 12 | static void init_mac_address(unsigned char mac_addr[16]) |
| 13 | { |
| 14 | unsigned long *ulval1 = (unsigned long*) &mac_addr[0]; |
| 15 | unsigned short *usval1 = (unsigned short*) &mac_addr[4]; |
| 16 | |
| 17 | *ulval1 = pj_rand(); |
| 18 | *usval1 = (unsigned short) pj_rand(); |
| 19 | } |
| 20 | |
| 21 | PJ_DEF(pj_str_t*) pj_generate_unique_string(pj_str_t *str) |
| 22 | { |
| 23 | static int guid_initialized; |
| 24 | static unsigned pid; |
| 25 | static char str_pid[5]; |
| 26 | static unsigned char mac_addr[6]; |
| 27 | static char str_mac_addr[16]; |
| 28 | static unsigned clock_seq; |
| 29 | |
| 30 | PJ_CHECK_STACK(); |
| 31 | |
| 32 | if (guid_initialized == 0) { |
| 33 | pid = pj_getpid(); |
| 34 | init_mac_address(mac_addr); |
| 35 | clock_seq = 0; |
| 36 | |
| 37 | sprintf(str_pid, "%04x", pid); |
| 38 | sprintf(str_mac_addr, "%02x%02x%02x%02x%02x%02x", |
| 39 | mac_addr[0], mac_addr[1], mac_addr[2], |
| 40 | mac_addr[3], mac_addr[4], mac_addr[5]); |
| 41 | |
| 42 | guid_initialized = 1; |
| 43 | } |
| 44 | |
| 45 | strcpy(str->ptr, str_pid); |
| 46 | sprintf(str->ptr+4, "%04x", clock_seq++); |
| 47 | pj_memcpy(str->ptr+8, str_mac_addr, 12); |
| 48 | str->slen = 20; |
| 49 | |
| 50 | return str; |
| 51 | } |
| 52 | |