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File: [cvs.NetBSD.org] / src / lib / libc / stdio / fgetstr.c (download)

Revision 1.12, Thu Jun 8 15:59:45 2017 UTC (6 years, 9 months ago) by uwe
Branch: MAIN
CVS Tags: phil-wifi-base, phil-wifi-20200421, phil-wifi-20200411, phil-wifi-20200406, phil-wifi-20191119, phil-wifi-20190609, phil-wifi, pgoyette-compat-merge-20190127, pgoyette-compat-base, pgoyette-compat-20190127, pgoyette-compat-20190118, pgoyette-compat-1226, pgoyette-compat-1126, pgoyette-compat-1020, pgoyette-compat-0930, pgoyette-compat-0906, pgoyette-compat-0728, pgoyette-compat-0625, pgoyette-compat-0521, pgoyette-compat-0502, pgoyette-compat-0422, pgoyette-compat-0415, pgoyette-compat-0407, pgoyette-compat-0330, pgoyette-compat-0322, pgoyette-compat-0315, pgoyette-compat, perseant-stdc-iso10646-base, perseant-stdc-iso10646, netbsd-9-base, netbsd-9-3-RELEASE, netbsd-9-2-RELEASE, netbsd-9-1-RELEASE, netbsd-9-0-RELEASE, netbsd-9-0-RC2, netbsd-9-0-RC1, netbsd-9, netbsd-10-base, netbsd-10-0-RELEASE, netbsd-10-0-RC6, netbsd-10-0-RC5, netbsd-10-0-RC4, netbsd-10-0-RC3, netbsd-10-0-RC2, netbsd-10-0-RC1, netbsd-10, is-mlppp-base, is-mlppp, cjep_sun2x-base1, cjep_sun2x-base, cjep_sun2x, cjep_staticlib_x-base1, cjep_staticlib_x-base, cjep_staticlib_x, HEAD
Changes since 1.11: +3 -3 lines

Don't use "NULL" to talk about null-terminated strings.

The C standard seems to be inconsistent about dash vs. space.  Old
text uses dash, Annex K uses space.  I'll let wizd(8) to sort that
out.

/* $NetBSD: fgetstr.c,v 1.12 2017/06/08 15:59:45 uwe Exp $	*/

/*
 * Copyright (c) 2009 The NetBSD Foundation, Inc.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Roy Marples.
 *
 * 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 AUTHOR ``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 AUTHOR 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.
 */

#include <sys/cdefs.h>
__RCSID("$NetBSD: fgetstr.c,v 1.12 2017/06/08 15:59:45 uwe Exp $");

#include "namespace.h"

#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>

#include "reentrant.h"
#include "local.h"

/*
 * Get an input line.
 * This now uses getdelim(3) for a code reduction.
 * The upside is that strings are now always null-terminated, but relying
 * on this is non portable - better to use the POSIX getdelim(3) function.
 */
char *
__fgetstr(FILE *__restrict fp, size_t *__restrict lenp, int sep)
{
	ssize_t n;

	_DIAGASSERT(fp != NULL);
	_DIAGASSERT(lenp != NULL);

	n = __getdelim(&_EXT(fp)->_fgetstr_buf, &_EXT(fp)->_fgetstr_len, sep, fp);
	if (n == -1) {
		*lenp = 0;
		if (__sferror(fp) && errno == EOVERFLOW) /* fixup errno */
			errno = EINVAL;
		return NULL;
	}
	*lenp = n;
	return _EXT(fp)->_fgetstr_buf;
}