Using variables from c to be passed into PQexec

Greetings,

I am a novice programmer and I am now totally lost,
I've been through the web trying to find a solution,
If I've posted on the wrong place please advise.

If I have this line in the code, I get there desired result.
res = PQexec(conn, "DECLARE mycursor CURSOR FOR select * from currpass
where sitename = 'tvl'");
I get :
------------------------------------------------------------------
sitename password date time

tvl Zb0sj1sds 2002-02-13 12:21:00
------------------------------------------------------------------

If I do this:
strcat(querystr,"\"DECLARE mycursor CURSOR FOR select * from currpass
where sitename = \'tvl\'\");
fprintf(stdout,"%s\n", querystr);
res = PQexec(conn, querystr);

I get
---------------------------------------------------------------------------
Output of fprintf:
"DECLARE mycursor CURSOR FOR select * from currpass where sitename =
'tvl'"

Error Message:
NOTICE: identifier "DECLARE mycursor CURSOR FOR select * from
currpass where si
tename = 'tvl'" will be truncated to "DECLARE mycursor CURSOR FOR sel"
DECLARE CURSOR command failed

-----------------------------------------------------------------------------

What am I missing ?

Please assist

Vikash