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e_storage_text.c
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e_storage_text.c
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/*
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include "verse.h"
#include "st_types.h"
#include "e_types.h"
#include "e_storage_node.h"
typedef struct {
VBufferID buffer_id;
char name[16];
char *data;
size_t length; /* Exact length of string. */
size_t allocated; /* Allocated space, typically larger than the string held. */
uint version;
} ESTextBuffer;
typedef struct {
ENodeHead head;
DynLookUpTable buffertables;
char language[512];
} ESTextNode;
#define ALLOC_EXTRA 1024
extern void e_ns_update_node_version_struct(ESTextNode *node);
char * e_nst_get_language(ESTextNode *t_node)
{
return t_node->language;
}
ESTextBuffer * e_nst_get_buffer_by_name(ESTextNode *node, char *name)
{
ESTextBuffer *buffer;
for(buffer = get_next_dlut(&node->buffertables, 0); buffer != NULL; buffer = get_next_dlut(&node->buffertables, buffer->buffer_id + 1))
if(strcmp(name, buffer->name) == 0)
return buffer;
return NULL;
}
ESTextBuffer *e_nst_get_buffer_by_id(ESTextNode *node, uint buffer_id)
{
return find_dlut(&node->buffertables, buffer_id);
}
ESTextBuffer *e_nst_get_buffer_next(ESTextNode *node, uint buffer_id)
{
return get_next_dlut(&node->buffertables, buffer_id);
}
const char * e_nst_get_buffer_data(ESTextNode *node, ESTextBuffer *buffer)
{
if(node != NULL && buffer != NULL)
{
if(buffer->data == NULL)
verse_send_t_buffer_subscribe(node->head.node_id, buffer->buffer_id);
return buffer->data;
}
return NULL;
}
uint e_nst_get_buffer_data_length(ESTextNode *node, ESTextBuffer *buffer)
{
return buffer->length;
}
uint e_nst_get_buffer_id(ESTextBuffer *buffer)
{
return buffer->buffer_id;
}
char * e_nst_get_buffer_name(ESTextBuffer *buffer)
{
return buffer->name;
}
uint e_nst_get_buffer_version(ESTextBuffer *buffer)
{
return buffer->version;
}
ESTextNode * e_create_t_node(VNodeID node_id, VNodeOwner owner)
{
ESTextNode *node;
if((node = (ESTextNode *) e_ns_get_node_networking(node_id)) == NULL)
{
node = malloc(sizeof *node);
init_dlut(&node->buffertables);
node->language[0] = 0;
e_ns_init_head((ENodeHead *)node, V_NT_TEXT, node_id, owner);
}
return node;
}
static void delete_text_buffer_func(uint id, void *buffer, void *user_data)
{
ESTextBuffer *real_buffer = buffer;
if(real_buffer->data != NULL)
free(real_buffer->data);
free(real_buffer);
}
void delete_text(ESTextNode *node)
{
foreach_remove_dlut(&node->buffertables, delete_text_buffer_func, NULL);
free(node);
}
static void callback_send_t_language_set(void *user, VNodeID node_id, const char *language)
{
ESTextNode *node;
uint i;
node = e_create_t_node(node_id, 0);
for(i = 0; i < 511 && language[i] != 0; i++)
node->language[i] = language[i];
node->language[i] = 0;
e_ns_update_node_version_struct(node);
}
static void callback_send_t_buffer_create(void *user, VNodeID node_id, VBufferID buffer_id, const char *name)
{
ESTextNode *node;
ESTextBuffer *buffer;
uint i;
node = e_create_t_node(node_id, 0);
if((buffer = find_dlut(&node->buffertables, buffer_id)) == NULL)
{
buffer = malloc(sizeof *buffer);
buffer->data = NULL;
buffer->length = 0;
buffer->allocated = 0;
buffer->version = 0;
buffer->buffer_id = buffer_id;
add_entry_dlut(&node->buffertables, buffer_id, buffer);
}
for(i = 0; i < 15 && name[i] != 0; i++)
buffer->name[i] = name[i];
buffer->name[i] = '\0';
buffer->version++;
e_ns_update_node_version_struct(node);
}
static void callback_send_t_buffer_destroy(void *user, VNodeID node_id, VBufferID buffer_id)
{
ESTextNode *node;
ESTextBuffer *buffer;
node = e_create_t_node(node_id, 0);
if((buffer = find_dlut(&node->buffertables, buffer_id)) != NULL)
{
remove_entry_dlut(&node->buffertables, buffer_id);
if(buffer->data != NULL)
free(buffer->data);
free(buffer);
e_ns_update_node_version_struct(node);
}
}
static void text_delete(ESTextBuffer *buf, size_t offset, size_t length)
{
if(offset > buf->length)
return;
if(offset + length > buf->length)
length = buf->length - offset;
if(length == 0)
return;
memmove(buf->data + offset, buf->data + offset + length, buf->length - (offset + length));
buf->length -= length;
buf->data[buf->length] = '\0';
/* FIXME: There (sh|c)ould be code here to realloc() the buffer *down*, if it shrunk a lot. */
}
static void text_insert(ESTextBuffer *buf, size_t offset, const char *text)
{
size_t len;
if(text == NULL)
return;
if(offset > buf->length)
offset = buf->length;
len = strlen(text);
if(len == 0)
return;
if(buf->length + len + 1 > buf->allocated)
{
char *nb;
nb = realloc(buf->data, buf->length + len + ALLOC_EXTRA);
if(nb == NULL)
{
fprintf(stderr, "Enough: Running out of memory in text storage\n");
return;
}
buf->data = nb;
buf->allocated = buf->length + len + ALLOC_EXTRA;
}
memmove(buf->data + offset + len, buf->data + offset, buf->length - offset);
memcpy(buf->data + offset, text, len);
buf->length += len;
buf->data[buf->length] = '\0';
}
static void callback_send_t_text_set(void *user, VNodeID node_id, VBufferID buffer_id, uint32 pos, uint32 length, const char *text)
{
ESTextNode *node;
ESTextBuffer *buffer;
node = e_create_t_node(node_id, 0);
if((buffer = find_dlut(&node->buffertables, buffer_id)) != NULL)
{
/* This is not optimally efficient for replacement, and also does the delete()
* without regard for the subsequent insert(). It is simple, though.
*/
text_delete(buffer, pos, length);
text_insert(buffer, pos, text);
}
}
void es_text_init(void)
{
verse_callback_set(verse_send_t_language_set, callback_send_t_language_set, NULL);
verse_callback_set(verse_send_t_buffer_create, callback_send_t_buffer_create, NULL);
verse_callback_set(verse_send_t_buffer_destroy, callback_send_t_buffer_destroy, NULL);
verse_callback_set(verse_send_t_text_set, callback_send_t_text_set, NULL);
}