CGI Programming in C

[franco67]

Hi would this c program compiled into cgi (using gcc) work on this site?

#include <stdio.h>
#include <stdlib.h>
int main(void)
{
char *data;
long m,n;
printf("%s%c%c\n",
"Content-Type:text/html;charset=iso-8859-1",13,10);
printf("<TITLE>Multiplication results</TITLE>\n");
printf("<H3>Multiplication results</H3>\n");
data = getenv("QUERY_STRING");
if(data == NULL)
printf("<P>Error! Error in passing data from form to script.");
else if(sscanf(data,"m=%ld&n=%ld",&m,&n)!=2)
printf("<P>Error! Invalid data. Data must be numeric.");
else
printf("<P>The product of %ld and %ld is %ld.",m,n,m*n);
return 0;
}

[misson]

Please delimit code with [code], [html] or [php] tags (as appropriate) to separate it from the rest of the post and format it.

This topic has been covered before on these very forums. Read over those now.

"Will this work?" is a vague question; if the other threads don't answer your question, please restate it to make the question more specific.

One difficulty you'll need to surmount is compiling the source for the specific Linux distro that X10 uses (CentOS 5.5).

[worldwise001]

I forsee a number of issues here.

a) As Misson said, you can't be certain of the version of gcc (minor issue) nor the version of libc (major issue).

b) printf prints to stdout by default unless the wrapper somehow pipes that to network stream.

c) that is a horrible program to be using http/cgi to wrap... it would be better to just write your own C network daemon.

[misson]

b) printf prints to stdout by default unless the wrapper somehow pipes that to network stream.

As per the CGI spec, the CGI process's stdout is returned to the HTTP client, possibly after processing by the web server.