/* Id: compat_getline.c,v 1.2 2020/06/15 01:37:14 schwarze Exp  */
/*
* Copyright (c) 2015 Ingo Schwarze <[email protected]>
*
* 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.
*/
#include "config.h"

#include <sys/types.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>

ssize_t
getline(char **buf, size_t *bufsz, FILE *fp)
{
       char    *nbuf;
       size_t   nbufsz, pos;
       int      c;

       if (buf == NULL || bufsz == NULL) {
               errno = EINVAL;
               return -1;
       }

       if (*buf == NULL)
               *bufsz = 0;
       else
               **buf = '\0';

       pos = 0;
       for (;;) {
               if (pos + 1 >= *bufsz) {
                       nbufsz = *bufsz ? *bufsz * 2 : BUFSIZ;
                       if ((nbuf = realloc(*buf, nbufsz)) == NULL)
                               return -1;
                       *buf = nbuf;
                       *bufsz = nbufsz;
               }
               if ((c = fgetc(fp)) == EOF) {
                       (*buf)[pos] = '\0';
                       return pos > 0 && feof(fp) ? (ssize_t)pos : -1;
               }
               (*buf)[pos++] = c;
               (*buf)[pos] = '\0';
               if (c == '\n')
                       return pos;
       }
}