minix/lib/libc/stdio/funopen.c
Lionel Sambuc f14fb60209 Libraries updates and cleanup
* 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
2013-01-14 11:36:26 +01:00

172 lines
4.4 KiB
C

/* $NetBSD: funopen.c,v 1.14 2012/03/28 15:21:11 christos Exp $ */
/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Chris Torek.
*
* 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 University 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 REGENTS 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 REGENTS 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.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)funopen.c 8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: funopen.c,v 1.14 2012/03/28 15:21:11 christos Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <stddef.h>
#include "reentrant.h"
#include "local.h"
FILE *
funopen2(const void *cookie,
ssize_t (*readfn)(void *, void *, size_t),
ssize_t (*writefn)(void *, const void *, size_t),
off_t (*seekfn)(void *, off_t, int),
int (*flushfn)(void *),
int (*closefn)(void *))
{
FILE *fp;
int flags;
if (readfn == NULL) {
if (writefn == NULL) { /* illegal */
errno = EINVAL;
return NULL;
} else
flags = __SWR; /* write only */
} else {
if (writefn == NULL)
flags = __SRD; /* read only */
else
flags = __SRW; /* read-write */
}
if ((fp = __sfp()) == NULL)
return NULL;
fp->_flags = flags;
fp->_file = -1;
fp->_cookie = __UNCONST(cookie);
fp->_read = readfn;
fp->_write = writefn;
fp->_seek = seekfn;
fp->_flush = flushfn;
fp->_close = closefn;
return fp;
}
typedef struct {
void *cookie;
int (*readfn)(void *, char *, int);
int (*writefn)(void *, const char *, int);
off_t (*seekfn)(void *, off_t, int);
int (*closefn)(void *);
} dookie_t;
static ssize_t
creadfn(void *dookie, void *buf, size_t len)
{
dookie_t *d = dookie;
if (len > INT_MAX)
len = INT_MAX;
return (*d->readfn)(d->cookie, buf, (int)len);
}
static ssize_t
cwritefn(void *dookie, const void *buf, size_t len)
{
dookie_t *d = dookie;
ssize_t nr;
size_t l = len;
const char *b = buf;
while (l) {
size_t nw = l > INT_MAX ? INT_MAX : l;
nr = (*d->writefn)(d->cookie, buf, (int)nw);
if (nr == -1) {
if (len == l)
return -1;
else
return len - l;
}
b += nr;
l -= nr;
}
return len;
}
static off_t
cseekfn(void *dookie, off_t off, int whence)
{
dookie_t *d = dookie;
return (*d->seekfn)(d->cookie, off, whence);
}
static int
cclosefn(void *dookie)
{
dookie_t *d = dookie;
void *c = d->cookie;
int (*cf)(void *) = d->closefn;
free(dookie);
return (*cf)(c);
}
FILE *
funopen(const void *cookie,
int (*readfn)(void *, char *, int),
int (*writefn)(void *, const char *, int),
off_t (*seekfn)(void *, off_t, int),
int (*closefn)(void *))
{
dookie_t *d;
FILE *fp;
if ((d = malloc(sizeof(*d))) == NULL)
return NULL;
d->cookie = __UNCONST(cookie);
d->readfn = readfn;
d->writefn = writefn;
d->seekfn = seekfn;
d->closefn = closefn;
fp = funopen2(d,
d->readfn ? creadfn : NULL,
d->writefn ? cwritefn : NULL,
d->seekfn ? cseekfn : NULL,
NULL,
d->closefn ? cclosefn : NULL);
if (fp != NULL)
return fp;
free(d);
return NULL;
}