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*cur=sqlite3_malloc(sizeof(Cursor));
return *cur?SQLITE_OK:SQLITE_NOMEM;
}
static int vt_graph_connect(sqlite3*db,void*aux,int argc,const char*const*argv,sqlite3_vtab**vt,char**ex) {
*vt=sqlite3_malloc(sizeof(sqlite3_vtab));
if(!*vt) return SQLITE_NOMEM;
sqlite3_declare_vtab(db,"CREATE TABLE `GRAPH`(`X` INT, `Y` INT, `C` INT);");
sqlite3_declare_vtab(db,"CREATE TABLE `GRAPH`(`X` INT, `Y` INT, `C` INT, `S` INT);");
return SQLITE_OK;
}
static int vt_graph_disconnect(sqlite3_vtab*vt) {
sqlite3_free(vt);
return SQLITE_OK;
}
static int vt_graph_filter(sqlite3_vtab_cursor*cc,int n,const char*s,int c,sqlite3_value**v) {
Cursor*cur=(void*)cc;
cur->pos=0;
return SQLITE_OK;
}
static int vt_graph_index(sqlite3_vtab*vt,sqlite3_index_info*inf) {
return SQLITE_OK;
}
static int vt_graph_column(sqlite3_vtab_cursor*cc,sqlite3_context*cxt,int n) {
Cursor*cur=(void*)cc;
switch(n) {
case 0: sqlite3_result_int(cxt,cur->pos%cur_pic->size); break;
case 1: sqlite3_result_int(cxt,cur->pos/cur_pic->size); break;
sqlite3_result_int(cxt,n==0?cur->pos%cur_pic->size:n==1?cur->pos/cur_pic->size:cur_pic->data[cur->pos+cur_pic->size]);
case 2: sqlite3_result_int(cxt,cur_pic->data[cur->pos+cur_pic->size]); break;
case 3: sqlite3_result_int(cxt,cur_pic->size); break;
}
return SQLITE_OK;
}
static int vt_graph_next(sqlite3_vtab_cursor*cc) {
Cursor*cur=(void*)cc;
cur->pos++;
return SQLITE_OK;
}
static int vt_graph_rowid(sqlite3_vtab_cursor*cc,sqlite3_int64*p) {
Cursor*cur=(void*)cc;
*p=cur->pos;
return SQLITE_OK;
}
static int vt_graph_update(sqlite3_vtab*vt,int argc,sqlite3_value**argv,sqlite3_int64*rowid) {
int x,y;
if(argc!=5) return SQLITE_CONSTRAINT_VTAB;
if(argc!=6) return SQLITE_CONSTRAINT_VTAB;
if(sqlite3_value_type(argv[0])==SQLITE_NULL) {
x=sqlite3_value_int(argv[2]);
y=sqlite3_value_int(argv[3]);
if(x<0 || x>=cur_pic->size || y<0 || y>=cur_pic->size) return SQLITE_CONSTRAINT_VTAB;
x+=y*cur_pic->size;
} else {
x=sqlite3_value_int(argv[0]);
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