dgetln.c

WSP is an HTTP to WSP proxy that can be used to forward HTTP requests to WSP, which is used in WAP 1

/*
 * Copyright (c) 1997-2002 Matthew R. Green
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer and
 *    dedication in the documentation and/or other materials provided
 *    with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

/* This code comes from bozohttpd 
 * http://www.eterna.com.au/bozohttpd/
 */

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>

#include "wspp.h"

/*
 * inspired by fgetln(3), but works for fd's.  should work identically
 * except it, however, does *not* return the newline, and it does nul
 * terminate the string.
 */
char * dgetln(int fd, ssize_t *lenp)
{
	static	char *buffer;
	static	ssize_t buflen = 0;
	ssize_t	len;
	int	got_cr = 0;
	char	c, *nbuffer;

	/* initialise */
	if (buflen == 0) {
		buflen = INITIAL_BUF_SIZE;
		buffer = malloc(buflen);
		if (buffer == NULL) {
			buflen = 0;
			return NULL;
		}
	}
	len = 0;

	/*
	 * we *have* to read one byte at a time, to not break cgi
	 * programs (for we pass stdin off to them).  could fix this
	 * by becoming a fd-passing program instead of just exec'ing
	 * the program
	 */
	for (; read(fd, &c, 1) == 1; ) {

		if (len == buflen) {
			buflen *= 2;
			nbuffer = realloc(buffer, buflen);
			if (nbuffer == NULL) {
				free(buffer);
				buflen = 0;
				buffer = NULL;
				return NULL;
			}
			buffer = nbuffer;
		}

		buffer[len++] = c;
		if (c == '\r') {
			got_cr = 1;
			continue;
		} else if (c == '\n') {
			/*
			 * HTTP/1.1 spec says to ignore CR and treat
			 * LF as the real line terminator.  even though
			 * the same spec defines CRLF as the line
			 * terminator, it is recommended in section 19.3
			 * to do the LF trick for tolerance.
			 */
			if (got_cr)
				len -= 2;
			else
				len -= 1;
			break;
		}

	}
	buffer[len] = '\0';
	*lenp = len;
	return (buffer);
}