Linux to obtain the hard drive serial number C source code __linux

This code utilizes the Linux hdparm command, unifies the pipe pipeline technology to obtain the hard disk serial number skillfully, may conveniently use in the software encryption or the authentication domain

Char buf[256],info[1024]={0};
Char *pos;
int i;

snbuf[0]=0;
Fp=popen ("Hdparm-i/dev/hda", "R");
if (FP)
{
while (Fgets (buf,sizeof) (BUF), FP)
{
I=strlen (Info) +strlen (BUF);
if (i>1023) break;
strcat (INFO,BUF);
}
POS=STRCASESTR (Info, "serialno=");
if (POS) pos+=9;
i=0;
while (POS)
{
if ((*pos<= ' Z ' &&*pos>= ' A ')
|| (*pos<= ' z ' &&*pos>= ' a ')
|| (*pos<= ' 9 ' &&*pos>= ' 0 ')
|| (*pos== '))
{
Snbuf[i]=*pos;
i++;
if (i>buflen-10) break;
pos++;
}
Else
{
Break
}
}
snbuf[i]=0;
}
Pclose (FP);