Non-interactive login using C program in UNIX(Solaris)

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http://www.unix.com – Hi i need a c programm to login in unix(solaris). non-interactivley because it seems difficult to do it with unix shell scripting and passwd command cant be used and also i don't have expect installed and i am not allowed to installed expect in our servers. is there any c programm that can help me to do this where the pasword is supplied in the programm itself. will it be applicable to other *nixes and can i execute the c programm like : Code: mypasswd abcd abcd  //where mypassword is the binary executable and abcd is the password instead of the usual passwd command wich goes (HowTos)