82 lines
2.5 KiB
C
82 lines
2.5 KiB
C
/* $NetBSD: fgetln.c,v 1.5 2008/04/29 05:46:08 martin Exp $ */
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/*-
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* Copyright (c) 1998 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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/*
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* XXX: This implementation doesn't quite conform to the specification
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* in the man page, in that it only manages one buffer at all, not one
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* per stdio stream. Since the previous implementation did the same,
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* this won't break anything new.
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*/
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char *
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fgetln(fp, len)
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FILE *fp;
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size_t *len;
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{
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static char *buf = NULL;
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static size_t bufsiz = 0;
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static size_t buflen = 0;
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int c;
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if (buf == NULL) {
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bufsiz = BUFSIZ;
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if ((buf = malloc(bufsiz)) == NULL)
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return NULL;
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}
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buflen = 0;
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while ((c = fgetc(fp)) != EOF) {
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if (buflen >= bufsiz) {
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size_t nbufsiz = bufsiz + BUFSIZ;
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char *nbuf = realloc(buf, nbufsiz);
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if (nbuf == NULL) {
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int oerrno = errno;
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free(buf);
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errno = oerrno;
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buf = NULL;
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return NULL;
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}
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buf = nbuf;
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bufsiz = nbufsiz;
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}
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buf[buflen++] = c;
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if (c == '\n')
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break;
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}
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*len = buflen;
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return buflen == 0 ? NULL : buf;
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}
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