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Fixed fgetln(3) implementation (from Joerg Jung) which does not depend on *BSD

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fgets(3) semantics.
This commit is contained in:
Nicholas Marriott
2016-02-19 13:35:46 +00:00
parent fc864529f5
commit e9d369a09e
1 changed files with 43 additions and 67 deletions
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102
compat/fgetln.c
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@@ -1,43 +1,26 @@
/* $NetBSD: fgetln.c,v 1.3 2007/08/07 02:06:58 lukem Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
/*
* Copyright (c) 2015 Joerg Jung <jung@openbsd.org>
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas.
* 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.
*
* 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.
* 3. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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.
* 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 <sys/types.h>
/*
* portable fgetln() version, NOT reentrant
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "tmux.h"
@@ -45,41 +28,34 @@ char *
fgetln(FILE *fp, size_t *len)
{
static char *buf = NULL;
static size_t bufsiz = 0;
char *ptr;
static size_t bufsz = 0;
size_t r = 0;
char *p;
int c, e;
if (buf == NULL) {
bufsiz = BUFSIZ;
if ((buf = malloc(bufsiz)) == NULL)
if (!fp || !len) {
errno = EINVAL;
return NULL;
}
if (fgets(buf, bufsiz, fp) == NULL)
if (!buf) {
if (!(buf = calloc(1, BUFSIZ)))
return NULL;
*len = 0;
while ((ptr = strchr(&buf[*len], '\n')) == NULL) {
size_t nbufsiz = bufsiz + BUFSIZ;
char *nbuf = realloc(buf, nbufsiz);
if (nbuf == NULL) {
int oerrno = errno;
bufsz = BUFSIZ;
}
while ((c = getc(fp)) != EOF) {
buf[r++] = c;
if (r == bufsz) {
if (!(p = reallocarray(buf, 2, bufsz))) {
e = errno;
free(buf);
errno = oerrno;
buf = NULL;
errno = e;
buf = NULL, bufsz = 0;
return NULL;
} else
buf = nbuf;
*len = bufsiz;
if (fgets(&buf[bufsiz], BUFSIZ, fp) == NULL)
return buf;
bufsiz = nbufsiz;
}
*len = (ptr - buf) + 1;
return buf;
buf = p, bufsz = 2 * bufsz;
}
if (c == '\n')
break;
}
return (*len = r) ? buf : NULL;
}