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https://github.com/xen-project/xen.git
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mjw@wray-m-3.hpl.hp.com
68485ace64
Start of code to talk to migration daemon to do migrate. Initial checkin of the migration daemon, xfrd.
134 lines
3.5 KiB
C
134 lines
3.5 KiB
C
/*
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* Copyright (C) 2001, 2002 Hewlett-Packard Company.
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/** @file
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* IOStream subtype for input and output to strings.
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* Usable from user or kernel code (with __KERNEL__ defined).
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*/
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#include "sys_string.h"
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#include "string_stream.h"
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#include "allocate.h"
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static int string_error(IOStream *io);
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static int string_close(IOStream *io);
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static void string_free(IOStream *io);
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/** Methods for a string stream. */
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static IOMethods string_methods = {
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//print: string_print,
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//getc: string_getc,
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error: string_error,
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close: string_close,
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free: string_free,
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};
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/** Get the string stream state.
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*
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* @param io string stream
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* @return state
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*/
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static inline StringData *get_string_data(IOStream *io){
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return (StringData*)io->data;
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}
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/** Test if a string stream has an error.
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*
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* @param io string stream
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* @return 0 if ok, error code otherwise
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*/
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static int string_error(IOStream *io){
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StringData *data = get_string_data(io);
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return data->out == NULL;
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}
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/** Close a string stream.
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*
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* @param io string stream
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* @return 0
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*/
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static int string_close(IOStream *io){
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StringData *data = get_string_data(io);
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data->in = NULL;
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data->out = NULL;
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return 0;
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}
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/** Free a string stream.
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* The stream must have been allocated, not statically created.
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* The stream state is freed, but the underlying string is not.
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*
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* @param io string stream
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*/
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static void string_free(IOStream *io){
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StringData *data = get_string_data(io);
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memzero(data, sizeof(*data));
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deallocate(data);
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}
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/** Get the methods to use for a string stream.
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*
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* @return methods
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*/
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IOMethods *string_stream_get_methods(void){
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return &string_methods;
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}
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/** Initialise a string stream, usually from static data.
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*
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* @param io address of IOStream to fill in
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* @param data address of StringData to fill in
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* @param s string to use
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* @param n length of the string
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*/
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void string_stream_init(IOStream *io, StringData *data, char *s, int n){
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if(data && io){
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memzero(data, sizeof(*data));
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data->string = (char*)s;
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data->in = data->string;
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data->out = data->string;
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data->size = n;
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data->end = data->string + n;
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memzero(io, sizeof(*io));
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io->methods = &string_methods;
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io->data = data;
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}
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}
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/** Allocate and initialise a string stream.
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*
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* @param s string to use
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* @param n length of the string
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* @return new stream (free using IOStream_free)
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*/
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IOStream *string_stream_new(char *s, int n){
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int ok = 0;
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StringData *data = ALLOCATE(StringData);
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IOStream *io = ALLOCATE(IOStream);
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if(data && io){
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ok = 1;
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string_stream_init(io, data, s, n);
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}
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if(!ok){
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deallocate(data);
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deallocate(io);
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io = NULL;
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}
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return io;
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}
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