html c cgi,using C to generate simple html page with cgi

C program:

#include

#include

int main()

{

char *data = getenv("QUERY_STRING");

char userName[30];

sscanf(data,"uname=%s", userName);

printf ("Content-Type: text/html\n\n");

printf ("");

printf ("

");

printf ("

");

printf ("

%s

", userName);

printf (" ");

return 0;

}

HTML:

Please enter your name:

I am trying to use the C program to make a simple html page that just displays the variable uname with GET from html. I am trying to do this by first compiling C to CGI with:

gcc echo.c -o echo.cgi

which it does fine. However, whenever I press submit the cgi file just starts to download. What am I doing wrong