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/*
* Copyright (C) 2001, 2002 Hewlett-Packard Company.
*
* 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
* IOStream subtype for input and output to strings.
* Usable from user or kernel code (with __KERNEL__ defined).
*/
#include "sys_string.h"
#include "string_stream.h"
#include "allocate.h"
static int string_print(IOStream *io, const char *msg, va_list args);
static int string_getc(IOStream *io);
static int string_error(IOStream *io);
static int string_close(IOStream *io);
static void string_free(IOStream *io);
/** Methods for a string stream. */
static IOMethods string_methods = {
//print: string_print,
//getc: string_getc,
error: string_error,
close: string_close,
free: string_free,
};
/** Get the string stream state.
*
* @param io string stream
* @return state
*/
static inline StringData *get_string_data(IOStream *io){
return (StringData*)io->data;
}
/** Read a character from a string stream.
*
* @param io string stream
* @return character read, IOSTREAM_EOF if no more input
*/
static int string_getc(IOStream *io){
StringData *data = get_string_data(io);
int c = IOSTREAM_EOF;
char *s = data->in;
if(s && s < data->end){
c = (unsigned)*s;
data->in = s+1;
}
return c;
}
/** Print to a string stream.
* Formats the data to an internal buffer and prints it.
* The formatted data must fit into the internal buffer.
*
* @param io string stream
* @param format print format
* @param args print arguments
* @return result of the print
*/
static int string_print(IOStream *io, const char *msg, va_list args){
StringData *data = get_string_data(io);
int k = data->end - data->out;
int n = vsnprintf(data->out, k, (char*)msg, args);
if(n < 0 || n > k ){
n = k;
IOStream_close(io);
} else {
data->out += n;
}
return n;
}
/** Test if a string stream has an error.
*
* @param io string stream
* @return 0 if ok, error code otherwise
*/
static int string_error(IOStream *io){
StringData *data = get_string_data(io);
return data->out == NULL;
}
/** Close a string stream.
*
* @param io string stream
* @return 0
*/
static int string_close(IOStream *io){
StringData *data = get_string_data(io);
data->in = NULL;
data->out = NULL;
return 0;
}
/** Free a string stream.
* The stream must have been allocated, not statically created.
* The stream state is freed, but the underlying string is not.
*
* @param io string stream
*/
static void string_free(IOStream *io){
StringData *data = get_string_data(io);
zero(data, sizeof(*data));
deallocate(data);
}
/** Get the methods to use for a string stream.
*
* @return methods
*/
IOMethods *string_stream_get_methods(void){
return &string_methods;
}
/** Initialise a string stream, usually from static data.
*
* @param io address of IOStream to fill in
* @param data address of StringData to fill in
* @param s string to use
* @param n length of the string
*/
void string_stream_init(IOStream *io, StringData *data, char *s, int n){
if(data && io){
zero(data, sizeof(*data));
data->string = (char*)s;
data->in = data->string;
data->out = data->string;
data->size = n;
data->end = data->string + n;
zero(io, sizeof(*io));
io->methods = &string_methods;
io->data = data;
}
}
/** Allocate and initialise a string stream.
*
* @param s string to use
* @param n length of the string
* @return new stream (free using IOStream_free)
*/
IOStream *string_stream_new(char *s, int n){
int ok = 0;
StringData *data = ALLOCATE(StringData);
IOStream *io = ALLOCATE(IOStream);
if(data && io){
ok = 1;
string_stream_init(io, data, s, n);
}
if(!ok){
deallocate(data);
deallocate(io);
io = NULL;
}
return io;
}
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