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/*
* Copyright (c) 2016, EMC / Isilon Storage Division
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDERS 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>
__FBSDID("$FreeBSD$");
#include <sys/fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include "local.h"
struct fopencookie_thunk {
void *foc_cookie;
cookie_io_functions_t foc_io;
};
static int _fopencookie_read(void *, char *, int);
static int _fopencookie_write(void *, const char *, int);
static fpos_t _fopencookie_seek(void *, fpos_t, int);
static int _fopencookie_close(void *);
FILE *
fopencookie(void *cookie, const char *mode, cookie_io_functions_t io_funcs)
{
int (*readfn)(void *, char *, int);
int (*writefn)(void *, const char *, int);
struct fopencookie_thunk *thunk;
FILE *fp;
int flags, oflags;
if ((flags = __sflags(mode, &oflags)) == 0)
return (NULL);
thunk = malloc(sizeof(*thunk));
if (thunk == NULL)
return (NULL);
thunk->foc_cookie = cookie;
thunk->foc_io = io_funcs;
readfn = _fopencookie_read;
writefn = _fopencookie_write;
if (flags == __SWR)
readfn = NULL;
else if (flags == __SRD)
writefn = NULL;
fp = funopen(thunk, readfn, writefn, _fopencookie_seek,
_fopencookie_close);
if (fp == NULL) {
free(thunk);
return (NULL);
}
if ((oflags & O_APPEND) != 0)
fp->_flags |= __SAPP;
return (fp);
}
static int
_fopencookie_read(void *cookie, char *buf, int size)
{
struct fopencookie_thunk *thunk;
thunk = cookie;
/* Reads from a stream with NULL read return EOF. */
if (thunk->foc_io.read == NULL)
return (0);
return ((int)thunk->foc_io.read(thunk->foc_cookie, buf, (size_t)size));
}
static int
_fopencookie_write(void *cookie, const char *buf, int size)
{
struct fopencookie_thunk *thunk;
thunk = cookie;
/* Writes to a stream with NULL write discard data. */
if (thunk->foc_io.write == NULL)
return (size);
return ((int)thunk->foc_io.write(thunk->foc_cookie, buf,
(size_t)size));
}
static fpos_t
_fopencookie_seek(void *cookie, fpos_t offset, int whence)
{
struct fopencookie_thunk *thunk;
off64_t off64;
int res;
switch (whence) {
case SEEK_SET:
case SEEK_CUR:
case SEEK_END:
break;
default:
/* fopencookie(3) only allows these three seek modes. */
errno = EINVAL;
return (-1);
}
thunk = cookie;
/*
* If seek is NULL, it is not possible to perform seek operations on
* the stream.
*/
if (thunk->foc_io.seek == NULL) {
errno = ENOTSUP;
return (-1);
}
off64 = (off64_t)offset;
res = thunk->foc_io.seek(thunk->foc_cookie, &off64, whence);
if (res < 0)
return (res);
return ((fpos_t)off64);
}
static int
_fopencookie_close(void *cookie)
{
struct fopencookie_thunk *thunk;
int ret, serrno;
ret = 0;
thunk = cookie;
if (thunk->foc_io.close != NULL)
ret = thunk->foc_io.close(thunk->foc_cookie);
serrno = errno;
free(thunk);
errno = serrno;
return (ret);
}
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