/*      $NetBSD: getline.c,v 1.2 2014/09/16 17:23:50 christos Exp $     */

/*-
* Copyright (c) 2011 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas.
*
* 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 in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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.
*/

#ifdef HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif

#if !HAVE_GETLINE
#include <stdlib.h>

#ifndef HAVE_NBTOOL_CONFIG_H
/* These headers are required, but included from nbtool_config.h */
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#endif

ssize_t
getdelim(char **buf, size_t *bufsiz, int delimiter, FILE *fp)
{
       char *ptr, *eptr;


       if (*buf == NULL || *bufsiz == 0) {
               *bufsiz = BUFSIZ;
               if ((*buf = malloc(*bufsiz)) == NULL)
                       return -1;
       }

       for (ptr = *buf, eptr = *buf + *bufsiz;;) {
               int c = fgetc(fp);
               if (c == -1) {
                       if (feof(fp)) {
                               ssize_t diff = (ssize_t)(ptr - *buf);
                               if (diff != 0) {
                                       *ptr = '\0';
                                       return diff;
                               }
                       }
                       return -1;
               }
               *ptr++ = c;
               if (c == delimiter) {
                       *ptr = '\0';
                       return ptr - *buf;
               }
               if (ptr + 2 >= eptr) {
                       char *nbuf;
                       size_t nbufsiz = *bufsiz * 2;
                       ssize_t d = ptr - *buf;
                       if ((nbuf = realloc(*buf, nbufsiz)) == NULL)
                               return -1;
                       *buf = nbuf;
                       *bufsiz = nbufsiz;
                       eptr = nbuf + nbufsiz;
                       ptr = nbuf + d;
               }
       }
}

ssize_t
getline(char **buf, size_t *bufsiz, FILE *fp)
{
       return getdelim(buf, bufsiz, '\n', fp);
}

#endif

#ifdef TEST
int
main(int argc, char *argv[])
{
       char *p = NULL;
       ssize_t len;
       size_t n = 0;

       while ((len = getline(&p, &n, stdin)) != -1)
               (void)printf("%zd %s", len, p);
       free(p);
       return 0;
}
#endif