* Updating common/lib * Updating lib/csu * Updating lib/libc * Updating libexec/ld.elf_so * Corrected test on __minix in featuretest to actually follow the meaning of the comment. * Cleaned up _REENTRANT-related defintions. * Disabled -D_REENTRANT for libfetch * Removing some unneeded __NBSD_LIBC defines and tests Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2
172 lines
4.4 KiB
C
172 lines
4.4 KiB
C
/* $NetBSD: funopen.c,v 1.14 2012/03/28 15:21:11 christos Exp $ */
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/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)funopen.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: funopen.c,v 1.14 2012/03/28 15:21:11 christos Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include <stdio.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include "reentrant.h"
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#include "local.h"
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FILE *
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funopen2(const void *cookie,
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ssize_t (*readfn)(void *, void *, size_t),
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ssize_t (*writefn)(void *, const void *, size_t),
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off_t (*seekfn)(void *, off_t, int),
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int (*flushfn)(void *),
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int (*closefn)(void *))
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{
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FILE *fp;
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int flags;
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if (readfn == NULL) {
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if (writefn == NULL) { /* illegal */
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errno = EINVAL;
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return NULL;
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} else
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flags = __SWR; /* write only */
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} else {
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if (writefn == NULL)
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flags = __SRD; /* read only */
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else
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flags = __SRW; /* read-write */
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}
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if ((fp = __sfp()) == NULL)
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return NULL;
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fp->_flags = flags;
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fp->_file = -1;
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fp->_cookie = __UNCONST(cookie);
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fp->_read = readfn;
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fp->_write = writefn;
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fp->_seek = seekfn;
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fp->_flush = flushfn;
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fp->_close = closefn;
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return fp;
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}
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typedef struct {
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void *cookie;
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int (*readfn)(void *, char *, int);
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int (*writefn)(void *, const char *, int);
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off_t (*seekfn)(void *, off_t, int);
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int (*closefn)(void *);
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} dookie_t;
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static ssize_t
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creadfn(void *dookie, void *buf, size_t len)
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{
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dookie_t *d = dookie;
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if (len > INT_MAX)
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len = INT_MAX;
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return (*d->readfn)(d->cookie, buf, (int)len);
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}
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static ssize_t
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cwritefn(void *dookie, const void *buf, size_t len)
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{
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dookie_t *d = dookie;
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ssize_t nr;
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size_t l = len;
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const char *b = buf;
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while (l) {
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size_t nw = l > INT_MAX ? INT_MAX : l;
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nr = (*d->writefn)(d->cookie, buf, (int)nw);
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if (nr == -1) {
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if (len == l)
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return -1;
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else
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return len - l;
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}
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b += nr;
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l -= nr;
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}
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return len;
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}
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static off_t
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cseekfn(void *dookie, off_t off, int whence)
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{
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dookie_t *d = dookie;
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return (*d->seekfn)(d->cookie, off, whence);
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}
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static int
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cclosefn(void *dookie)
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{
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dookie_t *d = dookie;
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void *c = d->cookie;
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int (*cf)(void *) = d->closefn;
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free(dookie);
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return (*cf)(c);
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}
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FILE *
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funopen(const void *cookie,
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int (*readfn)(void *, char *, int),
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int (*writefn)(void *, const char *, int),
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off_t (*seekfn)(void *, off_t, int),
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int (*closefn)(void *))
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{
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dookie_t *d;
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FILE *fp;
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if ((d = malloc(sizeof(*d))) == NULL)
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return NULL;
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d->cookie = __UNCONST(cookie);
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d->readfn = readfn;
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d->writefn = writefn;
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d->seekfn = seekfn;
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d->closefn = closefn;
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fp = funopen2(d,
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d->readfn ? creadfn : NULL,
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d->writefn ? cwritefn : NULL,
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d->seekfn ? cseekfn : NULL,
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NULL,
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d->closefn ? cclosefn : NULL);
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if (fp != NULL)
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return fp;
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free(d);
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return NULL;
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}
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