/*
* Copyright (c) 2005 Martin Decky
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - 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.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/** @addtogroup libc
* @{
*/
/** @file
*/
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <assert.h>
#include <string.h>
#include <errno.h>
#include <bool.h>
#include <malloc.h>
#include <io/klog.h>
#include <vfs/vfs.h>
#include <ipc/devmap.h>
#include <adt/list.h>
static void _fflushbuf(FILE *stream);
static FILE stdin_null = {
.fd = -1,
.error = true,
.eof = true,
.klog = false,
.phone = -1,
.btype = _IONBF,
.buf = NULL,
.buf_size = 0,
.buf_head = NULL
};
static FILE stdout_klog = {
.fd = -1,
.error = false,
.eof = false,
.klog = true,
.phone = -1,
.btype = _IOLBF,
.buf = NULL,
.buf_size = BUFSIZ,
.buf_head = NULL
};
static FILE stderr_klog = {
.fd = -1,
.error = false,
.eof = false,
.klog = true,
.phone = -1,
.btype = _IONBF,
.buf = NULL,
.buf_size = 0,
.buf_head = NULL
};
FILE *stdin = NULL;
FILE *stdout = NULL;
FILE *stderr = NULL;
static LIST_INITIALIZE(files);
void stdio_init(int filc, fdi_node_t *filv[])
{
if (filc > 0) {
stdin = fopen_node(filv[0], "r");
} else {
stdin = &stdin_null;
list_append(&stdin->link, &files);
}
if (filc > 1) {
stdout = fopen_node(filv[1], "w");
} else {
stdout = &stdout_klog;
list_append(&stdout->link, &files);
}
if (filc > 2) {
stderr = fopen_node(filv[2], "w");
} else {
stderr = &stderr_klog;
list_append(&stderr->link, &files);
}
}
void stdio_done(void)
{
link_t *link = files.next;
while (link != &files) {
FILE *file = list_get_instance(link, FILE, link);
link = files.next;
}
}
static bool parse_mode(const char *mode, int *flags)
{
/* Parse mode except first character. */
const char *mp = mode;
if (*mp++ == 0) {
errno = EINVAL;
return false;
}
if ((*mp == 'b') || (*mp == 't'))
mp++;
bool plus;
if (*mp == '+') {
mp++;
plus = true;
} else
plus = false;
if (*mp != 0) {
errno = EINVAL;
return false;
}
/* Parse first character of mode and determine flags for open(). */
switch (mode[0]) {
case 'r':
*flags = plus ? O_RDWR : O_RDONLY;
break;
case 'w':
*flags = (O_TRUNC | O_CREAT) | (plus ? O_RDWR : O_WRONLY);
break;
case 'a':
/* TODO: a+ must read from beginning, append to the end. */
if (plus) {
errno = ENOTSUP;
return false;
}
*flags = (O_APPEND | O_CREAT) | (plus ? O_RDWR : O_WRONLY);
default:
errno = EINVAL;
return false;
}
return true;
}
/** Set stream buffer. */
void setvbuf(FILE
*stream
, void *buf
, int mode
, size_t size
) {
stream->btype = mode;
stream->buf = buf;
stream->buf_size = size;
stream->buf_head = stream->buf;
}
/** Allocate stream buffer. */
static int _fallocbuf(FILE *stream)
{
stream
->buf
= malloc(stream
->buf_size
); if (stream->buf == NULL) {
errno = ENOMEM;
return -1;
}
stream->buf_head = stream->buf;
return 0;
}
/** Open a stream.
*
* @param path Path of the file to open.
* @param mode Mode string, (r|w|a)[b|t][+].
*
*/
FILE
*fopen(const char *path
, const char *mode
){
int flags;
if (!parse_mode(mode, &flags))
return NULL;
/* Open file. */
FILE
*stream
= malloc(sizeof(FILE
)); if (stream == NULL) {
errno = ENOMEM;
return NULL;
}
stream->fd = open(path, flags, 0666);
if (stream->fd < 0) {
/* errno was set by open() */
return NULL;
}
stream->error = false;
stream->eof = false;
stream->klog = false;
stream->phone = -1;
/* FIXME: Should select buffering type based on what was opened. */
setvbuf(stream
, NULL
, _IOFBF
, BUFSIZ
);
list_append(&stream->link, &files);
return stream;
}
FILE
*fdopen(int fd
, const char *mode
){
/* Open file. */
FILE
*stream
= malloc(sizeof(FILE
)); if (stream == NULL) {
errno = ENOMEM;
return NULL;
}
stream->fd = fd;
stream->error = false;
stream->eof = false;
stream->klog = false;
stream->phone = -1;
/* FIXME: Should select buffering type based on what was opened. */
setvbuf(stream
, NULL
, _IOLBF
, BUFSIZ
);
list_append(&stream->link, &files);
return stream;
}
FILE *fopen_node(fdi_node_t *node, const char *mode)
{
int flags;
if (!parse_mode(mode, &flags))
return NULL;
/* Open file. */
FILE
*stream
= malloc(sizeof(FILE
)); if (stream == NULL) {
errno = ENOMEM;
return NULL;
}
stream->fd = open_node(node, flags);
if (stream->fd < 0) {
/* errno was set by open_node() */
return NULL;
}
stream->error = false;
stream->eof = false;
stream->klog = false;
stream->phone = -1;
/* FIXME: Should select buffering type based on what was opened. */
setvbuf(stream
, NULL
, _IOLBF
, BUFSIZ
);
list_append(&stream->link, &files);
return stream;
}
{
int rc = 0;
if (stream->phone >= 0)
ipc_hangup(stream->phone);
if (stream->fd >= 0)
rc = close(stream->fd);
list_remove(&stream->link);
if ((stream != &stdin_null)
&& (stream != &stdout_klog)
&& (stream != &stderr_klog))
stream = NULL;
if (rc != 0) {
/* errno was set by close() */
return EOF;
}
return 0;
}
/** Read from a stream.
*
* @param buf Destination buffer.
* @param size Size of each record.
* @param nmemb Number of records to read.
* @param stream Pointer to the stream.
*
*/
size_t fread(void *buf
, size_t size
, size_t nmemb
, FILE
*stream
) {
size_t left = size * nmemb;
size_t done = 0;
/* Make sure no data is pending write. */
_fflushbuf(stream);
while ((left > 0) && (!stream->error) && (!stream->eof)) {
ssize_t rd = read(stream->fd, buf + done, left);
if (rd < 0)
stream->error = true;
else if (rd == 0)
stream->eof = true;
else {
left -= rd;
done += rd;
}
}
return (done / size);
}
static size_t _fwrite(const void *buf, size_t size, size_t nmemb, FILE *stream)
{
size_t left = size * nmemb;
size_t done = 0;
while ((left > 0) && (!stream->error)) {
ssize_t wr;
if (stream->klog)
wr = klog_write(buf + done, left);
else
wr = write(stream->fd, buf + done, left);
if (wr <= 0)
stream->error = true;
else {
left -= wr;
done += wr;
}
}
return (done / size);
}
/** Drain stream buffer, do not sync stream. */
static void _fflushbuf(FILE *stream)
{
size_t bytes_used;
if (!stream->buf || stream->btype == _IONBF || stream->error)
return;
bytes_used = stream->buf_head - stream->buf;
if (bytes_used == 0)
return;
(void) _fwrite(stream->buf, 1, bytes_used, stream);
stream->buf_head = stream->buf;
}
/** Write to a stream.
*
* @param buf Source buffer.
* @param size Size of each record.
* @param nmemb Number of records to write.
* @param stream Pointer to the stream.
*
*/
size_t fwrite(const void *buf
, size_t size
, size_t nmemb
, FILE
*stream
) {
uint8_t *data;
size_t bytes_left;
size_t now;
size_t buf_free;
size_t total_written;
size_t i;
uint8_t b;
bool need_flush;
/* If not buffered stream, write out directly. */
if (stream->btype == _IONBF)
return _fwrite(buf, size, nmemb, stream);
/* Perform lazy allocation of stream buffer. */
if (stream->buf == NULL) {
if (_fallocbuf(stream) != 0)
return 0; /* Errno set by _fallocbuf(). */
}
data = (uint8_t *) buf;
bytes_left = size * nmemb;
total_written = 0;
need_flush = false;
while (!stream->error && bytes_left > 0) {
buf_free = stream->buf_size - (stream->buf_head - stream->buf);
if (bytes_left > buf_free)
now = buf_free;
else
now = bytes_left;
for (i = 0; i < now; i++) {
b = data[i];
stream->buf_head[i] = b;
if (b == '\n' && stream->btype == _IOLBF)
need_flush = true;
}
buf += now;
stream->buf_head += now;
buf_free -= now;
bytes_left -= now;
total_written += now;
if (buf_free == 0) {
/* Only need to drain buffer. */
_fflushbuf(stream);
need_flush = false;
}
}
if (need_flush)
return (total_written / size);
}
int fputc(wchar_t c
, FILE
*stream
) {
char buf[STR_BOUNDS(1)];
size_t sz = 0;
if (chr_encode(c, buf, &sz, STR_BOUNDS(1)) == EOK) {
size_t wr
= fwrite(buf
, sz
, 1, stream
);
if (wr < sz)
return EOF;
return (int) c;
}
return EOF;
}
{
}
int fputs(const char *str
, FILE
*stream
) {
return fwrite(str
, str_size
(str
), 1, stream
); }
int puts(const char *str
) {
return fputs(str
, stdout
); }
{
char c;
/* This could be made faster by only flushing when needed. */
if (stdout)
if (stderr)
if (fread(&c
, sizeof(char), 1, stream
) < sizeof(char)) return EOF;
return (int) c;
}
{
}
int fseek(FILE
*stream
, long offset
, int origin
) {
off_t rc = lseek(stream->fd, offset, origin);
if (rc == (off_t) (-1)) {
/* errno has been set by lseek. */
return -1;
}
stream->eof = false;
return 0;
}
{
(void) fseek(stream
, 0, SEEK_SET
); }
{
_fflushbuf(stream);
if (stream->klog) {
klog_update();
return EOK;
}
if (stream->fd >= 0)
return fsync(stream->fd);
return ENOENT;
}
{
return stream->eof;
}
{
return stream->error;
}
int fphone(FILE *stream)
{
if (stream->fd >= 0) {
if (stream->phone < 0)
stream->phone = fd_phone(stream->fd);
return stream->phone;
}
return -1;
}
int fnode(FILE *stream, fdi_node_t *node)
{
if (stream->fd >= 0)
return fd_node(stream->fd, node);
return ENOENT;
}
/** @}
*/