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/*
* Copyright (C) 2001 - 2004 Mike Wray <mike.wray@hp.com>
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/** @file
* An IOStream implementation using FILE*.
*/
#ifndef __KERNEL__
#include <stdio.h>
#include <stdlib.h>
#include "allocate.h"
#include "file_stream.h"
static int file_read(IOStream *s, void *buf, size_t n);
static int file_write(IOStream *s, const void *buf, size_t n);
static int file_error(IOStream *s);
static int file_close(IOStream *s);
static void file_free(IOStream *s);
static int file_flush(IOStream *s);
/** Methods used by a FILE* IOStream. */
static const IOMethods file_methods = {
read: file_read,
write: file_write,
error: file_error,
close: file_close,
free: file_free,
flush: file_flush,
};
/** IOStream for stdin. */
static IOStream _iostdin = {
methods: &file_methods,
data: (void*)1,
};
/** IOStream for stdout. */
static IOStream _iostdout = {
methods: &file_methods,
data: (void*)2,
};
/** IOStream for stderr. */
static IOStream _iostderr = {
methods: &file_methods,
data: (void*)3,
};
/** IOStream for stdin. */
IOStream *iostdin = &_iostdin;
/** IOStream for stdout. */
IOStream *iostdout = &_iostdout;
/** IOStream for stderr. */
IOStream *iostderr = &_iostderr;
/** Get the underlying FILE*.
*
* @param s file stream
* @return the stream s wraps
*/
static inline FILE *get_file(IOStream *s){
switch((long)s->data){
case 1: s->data = stdin; break;
case 2: s->data = stdout; break;
case 3: s->data = stderr; break;
}
return (FILE*)s->data;
}
/** Control buffering on the underlying stream, like setvbuf().
*
* @param io file stream
* @param buf buffer
* @param mode buffering mode (see man setvbuf())
* @param size buffer size
* @return 0 on success, non-zero otherwise
*/
int file_stream_setvbuf(IOStream *io, char *buf, int mode, size_t size){
return setvbuf(get_file(io), buf, mode, size);
}
/** Write to the underlying stream using fwrite();
*
* @param stream input
* @param buf where to put input
* @param n number of bytes to write
* @return number of bytes written
*/
static int file_write(IOStream *s, const void *buf, size_t n){
return fwrite(buf, 1, n, get_file(s));
}
/** Read from the underlying stream using fread();
*
* @param stream input
* @param buf where to put input
* @param n number of bytes to read
* @return number of bytes read
*/
static int file_read(IOStream *s, void *buf, size_t n){
return fread(buf, 1, n, get_file(s));
}
/** Fush the underlying stream using fflush().
*
* @param s file stream
* @return 0 on success, error code otherwise
*/
static int file_flush(IOStream *s){
return fflush(get_file(s));
}
/** Check if a stream has an error.
*
* @param s file stream
* @return 1 if has an error, 0 otherwise
*/
static int file_error(IOStream *s){
return ferror(get_file(s));
}
/** Close a file stream.
*
* @param s file stream to close
* @return result of the close
*/
static int file_close(IOStream *s){
return fclose(get_file(s));
}
/** Free a file stream.
*
* @param s file stream
*/
static void file_free(IOStream *s){
// Do nothing - fclose does it all?
}
/** Create an IOStream for a stream.
*
* @param f stream to wrap
* @return new IOStream using f for i/o
*/
IOStream *file_stream_new(FILE *f){
IOStream *io = ALLOCATE(IOStream);
if(io){
io->methods = &file_methods;
io->data = (void*)f;
}
return io;
}
/** IOStream version of fopen().
*
* @param file name of the file to open
* @param flags giving the mode to open in (as for fopen())
* @return new stream for the open file, or 0 if failed
*/
IOStream *file_stream_fopen(const char *file, const char *flags){
IOStream *io = 0;
FILE *fin = fopen(file, flags);
if(fin){
io = file_stream_new(fin);
if(!io){
fclose(fin);
//free(fin); // fclose frees ?
}
}
return io;
}
/** IOStream version of fdopen().
*
* @param fd file descriptor
* @param flags giving the mode to open in (as for fdopen())
* @return new stream for the open file, or 0 if failed
*/
IOStream *file_stream_fdopen(int fd, const char *flags){
IOStream *io = 0;
FILE *fin = fdopen(fd, flags);
if(fin){
io = file_stream_new(fin);
}
return io;
}
#endif
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