157 lines
4.1 KiB
C
157 lines
4.1 KiB
C
/* $NetBSD: getdelim.c,v 1.7 2009/10/25 20:44:13 christos Exp $ */
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/*
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* Copyright (c) 2009 The NetBSD Foundation, Inc.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Roy Marples.
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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 AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: getdelim.c,v 1.7 2009/10/25 20:44:13 christos Exp $");
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#include "namespace.h"
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#include <sys/param.h>
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#include <assert.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "reentrant.h"
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#include "local.h"
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/* Minimum buffer size we create.
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* This should allow config files to fit into our power of 2 buffer growth
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* without the need for a realloc. */
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#define MINBUF 128
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/* This private function allows strings of upto SIZE_MAX - 2
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* and returns 0 on EOF, both of which are disallowed by POSIX.
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* Maybe this should be named fgetdelim and proposed to the OpenGroup....*/
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ssize_t
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__getdelim(char **__restrict buf, size_t *__restrict buflen,
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int sep, FILE *__restrict fp)
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{
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unsigned char *p;
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size_t len, newlen, off;
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char *newb;
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_DIAGASSERT(fp != NULL);
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if (buf == NULL || buflen == NULL) {
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errno = EINVAL;
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return -1;
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}
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/* If buf is NULL, we have to assume a size of zero */
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if (*buf == NULL)
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*buflen = 0;
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FLOCKFILE(fp);
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_SET_ORIENTATION(fp, -1);
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off = 0;
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for (;;) {
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/* If the input buffer is empty, refill it */
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if (fp->_r <= 0 && __srefill(fp)) {
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if (__sferror(fp))
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goto error;
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break;
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}
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/* Scan through looking for the separator */
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p = memchr(fp->_p, sep, (size_t)fp->_r);
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if (p == NULL)
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len = fp->_r;
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else
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len = (p - fp->_p) + 1;
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newlen = off + len + 1;
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/* Ensure we can handle it */
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if (newlen < off || newlen > SIZE_MAX - 2) {
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errno = EOVERFLOW;
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goto error;
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}
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if (newlen > *buflen) {
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if (newlen < MINBUF)
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newlen = MINBUF;
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if (!powerof2(newlen)) {
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/* Grow the buffer to the next power of 2 */
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newlen--;
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newlen |= newlen >> 1;
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newlen |= newlen >> 2;
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newlen |= newlen >> 4;
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newlen |= newlen >> 8;
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newlen |= newlen >> 16;
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#if SIZE_T_MAX > 0xffffffffU
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newlen |= newlen >> 32;
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#endif
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newlen++;
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}
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newb = realloc(*buf, newlen);
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if (newb == NULL)
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goto error;
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*buf = newb;
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*buflen = newlen;
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}
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(void)memcpy((*buf + off), fp->_p, len);
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/* Safe, len is never greater than what fp->_r can fit. */
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fp->_r -= (int)len;
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fp->_p += (int)len;
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off += len;
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if (p != NULL)
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break;
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}
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FUNLOCKFILE(fp);
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if (*buf != NULL)
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*(*buf + off) = '\0';
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return off;
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error:
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FUNLOCKFILE(fp);
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return -1;
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}
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ssize_t
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getdelim(char **__restrict buf, size_t *__restrict buflen,
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int sep, FILE *__restrict fp)
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{
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ssize_t len;
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len = __getdelim(buf, buflen, sep, fp);
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if (len == 0) {
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/* POSIX requires that we return -1 on EOF */
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return -1;
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} else if (len < -1) {
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/* POSIX requires no string larger than SSIZE_MAX */
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errno = EOVERFLOW;
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return -1;
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}
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return len;
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}
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