Please fill out all the fields

#include "cgic.h"

/* Change this, if necessary, to point to the location of the 
	sendmail binary on your system. */

#define SENDMAIL "/lib/sendmail -t"

/* CHANGE THIS to your email address. */

#define RECIPIENT "CHANGE@ADDRESS.COM"

int cgiMain() {
	/* Large enough buffers for any reasonable real name
		and email address. */
	char name[256];
	char email[256];

	/* The version "number". */
	char version[32];

	/* The user's system. */
	char userSystem[32];

	/* The bug report itself may be quite large, so we'll
		allocate space once we know how large it is. */
	char *bug;

	/* Space needed for the bug string. */
	int needed;

	/* Keep the results so we can complain if fields are missing. */
	int rName, rEmail, rComments, rVersion, rSystem;

	FILE *out;

	/* Output the usual MIME header. */
	cgiHeaderContentType("text/html");

	/* Start the HTML document. */
	fprintf(cgiOut,
		"<HTML>\n<HEAD>\n");

	/* cgiFormStringNoNewlines()
		will never overflow buffers or write a
		non-terminated string. Also, even if
		the user's browser is defective, it will
		not return any carriage returns or line feeds. */

	rName = cgiFormStringNoNewlines("name", name, sizeof(name));
	rEmail = cgiFormStringNoNewlines("email", email, sizeof(email));
	
	/* A "falsified" version number would not particularly
		matter in this case, so we'll just get the string
		instead of using cgiFormSelectSingle. */
	rVersion = cgiFormStringNoNewlines("version", version, 
		sizeof(version));

	/* The same goes for the system. */
	rSystem = cgiFormStringNoNewlines("system", userSystem,
		sizeof(userSystem));

	/* cgiFormStringSpaceNeeded returns the number of bytes of
		space guaranteed to be adequate for the
		string in question, including the terminating null. */
	
	rComments = cgiFormStringSpaceNeeded("bug", &needed);	

	/* Now check for missing fields. Since any well-behaved browser
		will submit the default for each option menu if nothing
		was actually chosen by the user, we check for
		the "PLEASE CHOOSE ONE" strings as well as for a
		missing field. */

	if ((rName == cgiFormNotFound) || (rEmail == cgiFormNotFound) ||
		(rComments == cgiFormNotFound) || (rSystem == cgiFormNotFound) ||
		(rVersion == cgiFormNotFound) ||
		(!strcmp(userSystem, "PLEASE CHOOSE ONE")) ||
		(!strcmp(version, "PLEASE CHOOSE ONE")))
	{
		/* If any field is missing, complain! */
		fprintf(cgiOut,
			"<title>Please fill out all the fields</title>\n");
		fprintf(cgiOut,
			"</head>\n");
		fprintf(cgiOut,
			"<h1>Please fill out all the fields</h1>\n");
		fprintf(cgiOut,
			"Please indicate your name, email address, software version\n");
		fprintf(cgiOut,
			"number, and system, and submit the form again.\n");
		fprintf(cgiOut, "</body></html>\n");
		return 0;
	}

	/* So far, so good. Allocate space for the bug. Since
		we are dynamically allocating the space, we will
		need to free the space later. */
	bug = (char *) malloc(needed);	

	/* In this case, we do want to allow new lines,
		so we call cgiFormString. cgiFormString
		will guarantee that line breaks are always
		represented simply by line feeds, even if
		the user's browser does something creative. */

	cgiFormString("bug", bug, needed);		
	
	/* OK, send email to the user responsible for bug reports. Use the
		popen() Unix function, which executes the specified program
		and writes to its standard input through a "pipe". */

        out = popen(SENDMAIL, "w");
        fprintf(out, "From: %s <%s>\n", name, email);
        fprintf(out, "To: %s\n", RECIPIENT);
	fprintf(out, "Subject: bug report\n");
	fprintf(out, "\n");
	fprintf(out, 
		"This bug report was submitted via the WWW-Email gateway.\n");
	fprintf(out, "--\n\n");
	fprintf(out, "System: %s\n", userSystem);
	fprintf(out, "Version: %s\n", version);
        fprintf(out, "%s\n", bug);

	/* Always close pipes with pclose(), not fclose(). */

	pclose(out);

	/* Say thanks. */
        fprintf(cgiOut, "<title>Thank you, %s</title>\n", name);
        fprintf(cgiOut, "</head>\n");
        fprintf(cgiOut, "<h1>Thank you, %s</h1>\n", name);
        fprintf(cgiOut, "Thank you for your bug report.\n");
        fprintf(cgiOut, "</body></html>\n");

	/* Free the memory we used for the bug report. */
	free(bug);
	
	/* We're done. */
	return 0;
}