| /* $Id$ |
| * |
| */ |
| #include <pj/guid.h> |
| #include <pj/os.h> |
| #include <pj/rand.h> |
| #include <pj/string.h> |
| #include <pj/compat/sprintf.h> |
| |
| const unsigned PJ_GUID_STRING_LENGTH=20; |
| |
| static void init_mac_address(unsigned char mac_addr[16]) |
| { |
| unsigned long *ulval1 = (unsigned long*) &mac_addr[0]; |
| unsigned short *usval1 = (unsigned short*) &mac_addr[4]; |
| |
| *ulval1 = pj_rand(); |
| *usval1 = (unsigned short) pj_rand(); |
| } |
| |
| PJ_DEF(pj_str_t*) pj_generate_unique_string(pj_str_t *str) |
| { |
| static int guid_initialized; |
| static unsigned pid; |
| static char str_pid[5]; |
| static unsigned char mac_addr[6]; |
| static char str_mac_addr[16]; |
| static unsigned clock_seq; |
| |
| PJ_CHECK_STACK(); |
| |
| if (guid_initialized == 0) { |
| pid = pj_getpid(); |
| init_mac_address(mac_addr); |
| clock_seq = 0; |
| |
| sprintf(str_pid, "%04x", pid); |
| sprintf(str_mac_addr, "%02x%02x%02x%02x%02x%02x", |
| mac_addr[0], mac_addr[1], mac_addr[2], |
| mac_addr[3], mac_addr[4], mac_addr[5]); |
| |
| guid_initialized = 1; |
| } |
| |
| strcpy(str->ptr, str_pid); |
| sprintf(str->ptr+4, "%04x", clock_seq++); |
| pj_memcpy(str->ptr+8, str_mac_addr, 12); |
| str->slen = 20; |
| |
| return str; |
| } |
| |