/*
* Copyright (c) 2012, Jonathan Schleifer <js@webkeks.org>
* 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 OWNER 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 <string.h>
#include <limits.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include "stream.h"
#include "file.h"
#ifndef O_BINARY
# define O_BINARY 0
#endif
#ifndef S_IRGRP
# define S_IRGRP 0
#endif
#ifndef S_IROTH
# define S_IROTH 0
#endif
#ifndef S_IWGRP
# define S_IWGRP 0
#endif
#ifndef S_IWOTH
# define S_IWOTH 0
#endif
#define DEFAULT_MODE S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH
struct CFWFile {
CFWStream stream;
int fd;
bool at_end;
};
static int
parse_mode(const char *mode)
{
if (!strcmp(mode, "r"))
return O_RDONLY;
if (!strcmp(mode, "rb"))
return O_RDONLY | O_BINARY;
if (!strcmp(mode, "r+"))
return O_RDWR;
if (!strcmp(mode, "rb+") || !strcmp(mode, "r+b"))
return O_RDWR | O_BINARY;
if (!strcmp(mode, "w"))
return O_WRONLY | O_CREAT | O_TRUNC;
if (!strcmp(mode, "wb"))
return O_WRONLY | O_CREAT | O_TRUNC | O_BINARY;
if (!strcmp(mode, "w+"))
return O_RDWR | O_CREAT | O_TRUNC;
if (!strcmp(mode, "wb+") || !strcmp(mode, "w+b"))
return O_RDWR | O_CREAT | O_TRUNC | O_BINARY;
if (!strcmp(mode, "a"))
return O_WRONLY | O_CREAT | O_APPEND;
if (!strcmp(mode, "ab"))
return O_WRONLY | O_CREAT | O_APPEND | O_BINARY;
if (!strcmp(mode, "a+"))
return O_RDWR | O_CREAT | O_APPEND;
if (!strcmp(mode, "ab+") || !strcmp(mode, "a+b"))
return O_RDWR | O_CREAT | O_APPEND | O_BINARY;
return -1;
}
static ssize_t
file_read(void *ptr, void *buf, size_t len)
{
CFWFile *file = ptr;
ssize_t ret;
if ((ret = read(file->fd, buf, len)) == 0)
file->at_end = true;
return ret;
}
static bool
file_write(void *ptr, const void *buf, size_t len)
{
CFWFile *file = ptr;
ssize_t ret;
if ((ret = write(file->fd, buf, len)) < len)
return false;
return true;
}
static bool
file_at_end(void *ptr)
{
CFWFile *file = ptr;
return file->at_end;
}
static void
file_close(void *ptr)
{
CFWFile *file = ptr;
close(file->fd);
}
static struct cfw_stream_ops stream_ops = {
.read = file_read,
.write = file_write,
.at_end = file_at_end,
.close = file_close
};
static bool
ctor(void *ptr, va_list args)
{
CFWFile *file = ptr;
const char *path = va_arg(args, const char*);
const char *mode = va_arg(args, const char*);
int flags;
/* Make sure we have a valid file in case we error out */
cfw_stream->ctor(ptr, args);
file->at_end = false;
if ((flags = parse_mode(mode)) == -1)
return false;
if ((file->fd = open(path, flags, DEFAULT_MODE)) == -1)
return false;
file->stream.ops = &stream_ops;
return true;
}
static void
dtor(void *ptr)
{
cfw_stream->dtor(ptr);
}
static CFWClass class = {
.name = "CFWFile",
.size = sizeof(CFWFile),
.ctor = ctor,
.dtor = dtor
};
CFWClass *cfw_file = &class;
static CFWFile cfw_stdin_ = {
.stream = {
.obj = {
.cls = &class,
.ref_cnt = INT_MAX
},
.ops = &stream_ops
},
.fd = 0,
.at_end = false
};
static CFWFile cfw_stdout_ = {
.stream = {
.obj = {
.cls = &class,
.ref_cnt = INT_MAX
},
.ops = &stream_ops
},
.fd = 1,
.at_end = false
};
static CFWFile cfw_stderr_ = {
.stream = {
.obj = {
.cls = &class,
.ref_cnt = INT_MAX
},
.ops = &stream_ops
},
.fd = 2,
.at_end = false
};
CFWFile *cfw_stdin = &cfw_stdin_;
CFWFile *cfw_stdout = &cfw_stdout_;
CFWFile *cfw_stderr = &cfw_stderr_;