/*

 * Copyright (c) 2015 Joerg Jung <jung@openbsd.org>

 *

 * Permission to use, copy, modify, and distribute this software for any

 * purpose with or without fee is hereby granted, provided that the above

 * copyright notice and this permission notice appear in all copies.

 *

 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF

 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

 */

/*

 * portable fgetln() version, NOT reentrant

 */

#include <stdio.h>

#include <stdlib.h>

#include <errno.h>

#include "compat.h"

char *

fgetln(FILE *fp, size_t *len)

{

  static char *buf = NULL;

  static size_t bufsz = 0;

  size_t r = 0;

  char *p;

  int c, e;

  if (!fp || !len) {

    errno = EINVAL;

    return NULL;

  }

  if (!buf) {

    if (!(buf = calloc(1, BUFSIZ)))

      return NULL;

    bufsz = BUFSIZ;

  }

  while ((c = getc(fp)) != EOF) {

    buf[r++] = c;

    if (r == bufsz) {

      if (!(p = reallocarray(buf, 2, bufsz))) {

        e = errno;

        free(buf);

        errno = e;

        buf = NULL, bufsz = 0;

        return NULL;

      }

      buf = p, bufsz = 2 * bufsz;

    }

    if (c == '\n')

      break;

  }

  return (*len = r) ? buf : NULL;

}