#include <stdio.h>

include <stdlib.h>
/**

Create random UUID
*
@param buf - buffer to be filled with the uuid string
/
char random_uuid( char buf[37] )
{
 const char c = "89ab";
 char p = buf;
 int n;
for( n = 0; n < 16; ++n )
 {

 int b = rand()%255;

 switch( n )
 {
     case 6:
         sprintf(
             p,
             "4%x",
             b%15 );
         break;
     case 8:
         sprintf(
             p,
             "%c%x",
             c[rand()%strlen( c )],
             b%15 );
         break;
     default:
         sprintf(
             p,
             "%02x",
             b );
         break;
 }

 p += 2;

 switch( n )
 {
     case 3:
     case 5:
     case 7:
     case 9:
         *p++ = '-';
         break;
 }

}
*p = 0;
return buf;
}</pre>