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      1 /* $NetBSD: fgetstr.c,v 1.12 2017/06/08 15:59:45 uwe Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2009 The NetBSD Foundation, Inc.
      5  *
      6  * This code is derived from software contributed to The NetBSD Foundation
      7  * by Roy Marples.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 #include <sys/cdefs.h>
     31 __RCSID("$NetBSD: fgetstr.c,v 1.12 2017/06/08 15:59:45 uwe Exp $");
     32 
     33 #include "namespace.h"
     34 
     35 #include <assert.h>
     36 #include <errno.h>
     37 #include <limits.h>
     38 #include <stdio.h>
     39 
     40 #include "reentrant.h"
     41 #include "local.h"
     42 
     43 /*
     44  * Get an input line.
     45  * This now uses getdelim(3) for a code reduction.
     46  * The upside is that strings are now always null-terminated, but relying
     47  * on this is non portable - better to use the POSIX getdelim(3) function.
     48  */
     49 char *
     50 __fgetstr(FILE *__restrict fp, size_t *__restrict lenp, int sep)
     51 {
     52 	ssize_t n;
     53 
     54 	_DIAGASSERT(fp != NULL);
     55 	_DIAGASSERT(lenp != NULL);
     56 
     57 	n = __getdelim(&_EXT(fp)->_fgetstr_buf, &_EXT(fp)->_fgetstr_len, sep, fp);
     58 	if (n == -1) {
     59 		*lenp = 0;
     60 		if (__sferror(fp) && errno == EOVERFLOW) /* fixup errno */
     61 			errno = EINVAL;
     62 		return NULL;
     63 	}
     64 	*lenp = n;
     65 	return _EXT(fp)->_fgetstr_buf;
     66 }
     67