/*
 * Copyright (C) 1993-2001 by Darren Reed.
 *
 * See the IPFILTER.LICENCE file for details on licencing.
 *
 * $Id: getline.c,v 1.3 2001/06/09 17:09:24 darrenr Exp $
 */

#include <stdio.h>
#if !defined(__SVR4) && !defined(__GNUC__)
#include <strings.h>
#endif
#include <string.h>
#include "ipf.h"


/*
 * Similar to fgets(3) but can handle '\\' and NL is converted to NUL.
 * Returns NULL if error occured, EOF encounterd or input line is too long.
 */
char *
getaline(char *str, size_t size, FILE *file, int *linenum)
{
        char *p;
        int s, len;

        do {
                for (p = str, s = size; ; p += (len - 1), s -= (len - 1)) {
                        /*
                         * if an error occured, EOF was encounterd, or there
                         * was no room to put NUL, return NULL.
                         */
                        if (fgets(p, s, file) == NULL)
                                return (NULL);
                        len = strlen(p);
                        if (p[len - 1] != '\n') {
                                p[len] = '\0';
                                break;
                        }
                        (*linenum)++;
                        p[len - 1] = '\0';
                        if (len < 2 || p[len - 2] != '\\')
                                break;
                        else
                                /*
                                 * Convert '\\' to a space so words don't
                                 * run together
                                 */
                                p[len - 2] = ' ';
                }
        } while (*str == '\0');
        return (str);
}