c code to change current user password using PAM API

[ashish yadav]

Hi,
 I want to write c code to change current user password.
The code first check for current password & then set new password.
The code must use PAM API just like passwd utility.
Also code must work without user intervention ie only by argument current
password & new password are given.
So, can any one know that already this work is done  or  i can use  passwd
utility in my c code using system command.
Also may be user may not root which is using this application.

Thanks.
Ashish Yadav
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