Here's my code which shows how to (in short) do a deep copy of a Tcl_Obj structure from C.
It stores any unknown type as string and the following in internal represenatation:
Here's the main code:
[deepcopy.h]
#ifndef DEEPCOPY_H
#define DEEPCOPY_H 1
#include <tcl.h>
void *Dc_GetTclObj(Tcl_Obj *obj);
Tcl_Obj *Dc_NewTclObj(void *ptr);
void Dc_FreeDcObj(void *ptr);
unsigned long Dc_ObjSize(void *ptr);
#endif[deepcopyInt.h]
#ifndef DEEPCOPYINT_H
#define DEEPCOPYINT_H 1
#define DCO_STRING 1
#define DCO_INTEGER 2
#define DCO_LONG 3
#define DCO_DOUBLE 4
#define DCO_LIST 5
#ifdef AOLSERVER
#define dc_Malloc Ns_Alloc
#define dc_Free Ns_Free
#else
#define dc_Malloc Tcl_Alloc
#define dc_Free Tcl_Free
#endif
/* objhead */
struct dcObjHead {
short type;
unsigned long size; // including dcObjHead
};
/* int object */
struct dcIntObj {
struct dcObjHead head;
int value;
};
static struct dcObjHead *int_GetTclObj(Tcl_Obj *to);
Tcl_Obj *int_NewTclObj(struct dcObjHead *o);
static void int_Free(struct dcObjHead *o);
/* long object */
struct dcLongObj {
struct dcObjHead head;
long value;
};
static struct dcObjHead *long_GetTclObj(Tcl_Obj *to);
Tcl_Obj *long_NewTclObj(struct dcObjHead *o);
static void long_Free(struct dcObjHead *o);
/* double object */
struct dcDoubleObj {
struct dcObjHead head;
double value;
};
static struct dcObjHead *double_GetTclObj(Tcl_Obj *to);
Tcl_Obj *double_NewTclObj(struct dcObjHead *o);
static void double_Free(struct dcObjHead *o);
/* string object */
struct dcStrObj {
struct dcObjHead head;
char string[1];
};
static struct dcObjHead *str_GetTclObj(Tcl_Obj *to);
Tcl_Obj *str_NewTclObj(struct dcObjHead *o);
static void str_Free(struct dcObjHead *o);
/* list object */
struct dcListObj {
struct dcObjHead head;
int nelem;
struct dcObjHead *list[1];
};
static struct dcObjHead *list_GetTclObj(Tcl_Obj *to);
Tcl_Obj *list_NewTclObj(struct dcObjHead *o);
static void list_Free(struct dcObjHead *o);
#endif
[deepcopy.c]
#include <tcl.h>
#include <deepcopy.h>
#include <deepcopyInt.h>
/* external API */
void *Dc_GetTclObj(Tcl_Obj *obj) {
void *rc;
char *otype = "";
if (obj->typePtr!=NULL) {
otype = obj->typePtr->name;
}
if (!strcmp(otype,"int")) {
rc = int_GetTclObj(obj);
} else if (!strcmp(otype,"long")) {
rc = long_GetTclObj(obj);
} else if (!strcmp(otype,"double")) {
rc = double_GetTclObj(obj);
} else if (!strcmp(otype,"list")) {
rc = list_GetTclObj(obj);
} else {
rc = str_GetTclObj(obj);
}
return rc;
}
Tcl_Obj *Dc_NewTclObj(void *ptr) {
struct dcObjHead *oh = ptr;
Tcl_Obj *rc = NULL;
switch (oh->type) {
case DCO_STRING:
rc = str_NewTclObj(ptr);
break;
case DCO_LIST:
rc = list_NewTclObj(ptr);
break;
case DCO_INTEGER:
rc = int_NewTclObj(ptr);
break;
case DCO_DOUBLE:
rc = double_NewTclObj(ptr);
break;
case DCO_LONG:
rc = long_NewTclObj(ptr);
break;
}
return rc;
}
void Dc_FreeDcObj(void *ptr) {
struct dcObjHead *oh = ptr;
switch (oh->type) {
case DCO_STRING:
str_Free(ptr);
break;
case DCO_LIST:
list_Free(ptr);
break;
case DCO_INTEGER:
int_Free(ptr);
break;
case DCO_LONG:
long_Free(ptr);
break;
case DCO_DOUBLE:
double_Free(ptr);
break;
}
}
unsigned long Dc_ObjSize(void *ptr) {
struct dcObjHead *oh = ptr;
return oh->size;
}
/* internal type representations */
static struct dcObjHead *str_GetTclObj(Tcl_Obj *to) {
struct dcStrObj *rc;
int strlen;
char *str = Tcl_GetStringFromObj(to, &strlen);
unsigned long size = strlen+1+sizeof(struct dcObjHead);
if (rc=(struct dcStrObj *) dc_Malloc(size)) {
memcpy(rc->string, str, strlen);
rc->string[strlen] = '\0';
rc->head.type = DCO_STRING;
rc->head.size = size;
}
return ((struct dcObjHead *) rc);
}
Tcl_Obj *str_NewTclObj(struct dcObjHead *o) {
struct dcStrObj *so = (struct dcStrObj *) o;
Tcl_Obj *rc = NULL;
if (o->type==DCO_STRING) {
rc = Tcl_NewStringObj(so->string,
o->size-sizeof(struct dcObjHead)-1);
}
return rc;
}
static void str_Free(struct dcObjHead *o) {
if (o->type==DCO_STRING) {
dc_Free(o);
}
}
static struct dcObjHead *int_GetTclObj(Tcl_Obj *to) {
struct dcIntObj *rc = (struct dcIntObj *)
dc_Malloc(sizeof(struct dcIntObj));
if (rc != NULL) {
Tcl_GetIntFromObj(NULL, to, &rc->value);
rc->head.type = DCO_INTEGER;
rc->head.size = sizeof(struct dcIntObj);
}
return ((struct dcObjHead *) rc);
}
Tcl_Obj *int_NewTclObj(struct dcObjHead *o) {
struct dcIntObj *so = (struct dcIntObj *) o;
Tcl_Obj *rc = NULL;
if (o->type==DCO_INTEGER) {
rc = Tcl_NewIntObj(so->value);
}
return rc;
}
static void int_Free(struct dcObjHead *o) {
if (o->type==DCO_INTEGER) {
dc_Free((void *) o);
}
}
static struct dcObjHead *long_GetTclObj(Tcl_Obj *to) {
struct dcLongObj *rc = (struct dcLongObj *)
dc_Malloc(sizeof(struct dcLongObj));
if (rc != NULL) {
Tcl_GetLongFromObj(NULL, to, &rc->value);
rc->head.type = DCO_LONG;
rc->head.size = sizeof(struct dcLongObj);
}
return ((struct dcObjHead *) rc);
}
Tcl_Obj *long_NewTclObj(struct dcObjHead *o) {
struct dcLongObj *so = (struct dcLongObj *) o;
Tcl_Obj *rc = NULL;
if (o->type==DCO_LONG) {
rc = Tcl_NewLongObj(so->value);
}
return rc;
}
static void long_Free(struct dcObjHead *o) {
if (o->type==DCO_LONG) {
dc_Free((void *) o);
}
}
static struct dcObjHead *double_GetTclObj(Tcl_Obj *to) {
struct dcDoubleObj *rc = (struct dcDoubleObj *)
dc_Malloc(sizeof(struct dcDoubleObj));
if (rc != NULL) {
Tcl_GetDoubleFromObj(NULL, to, &rc->value);
rc->head.type = DCO_DOUBLE;
rc->head.size = sizeof(struct dcDoubleObj);
}
return ((struct dcObjHead *) rc);
}
Tcl_Obj *double_NewTclObj(struct dcObjHead *o) {
struct dcDoubleObj *so = (struct dcDoubleObj *) o;
Tcl_Obj *rc = NULL;
if (o->type==DCO_DOUBLE) {
rc = Tcl_NewDoubleObj(so->value);
}
return rc;
}
static void double_Free(struct dcObjHead *o) {
if (o->type==DCO_DOUBLE) {
dc_Free((void *) o);
}
}
static struct dcObjHead *list_GetTclObj(Tcl_Obj *to) {
Tcl_Obj *elem;
struct dcListObj *rc;
int size, llen, i;
if (Tcl_ListObjLength(NULL,to,&llen) != TCL_OK)
return NULL;
size = sizeof(struct dcListObj)+(llen-1)*sizeof(struct dcListObj *);
rc = (struct dcListObj *) dc_Malloc(size);
if (rc != NULL) {
rc->head.type = DCO_LIST;
rc->nelem = llen;
for (i=0 ; i<llen ; i++) {
if (Tcl_ListObjIndex(NULL,to,i,&elem)!=TCL_OK) {
rc->list[i] = NULL;
} else {
rc->list[i] = Dc_GetTclObj(elem);
size += rc->list[i]->size;
}
}
rc->head.size = size;
}
return ((struct dcObjHead *) rc);
}
Tcl_Obj *list_NewTclObj(struct dcObjHead *o) {
struct dcListObj *so = (struct dcListObj *) o;
Tcl_Obj *rc = NULL, **tbl;
int llen,i;
if (o->type==DCO_LIST) {
llen = so->nelem;
tbl = dc_Malloc(llen*sizeof(Tcl_Obj *));
if (tbl!=NULL) {
for (i=0 ; i<llen ; i++) {
tbl[i] = Dc_NewTclObj(so->list[i]);
}
rc = Tcl_NewListObj(llen,tbl);
dc_Free(tbl);
}
}
return rc;
}
static void list_Free(struct dcObjHead *o) {
struct dcListObj *so = o;
int i;
if (o->type==DCO_LIST) {
for (i=0 ; i<so->nelem ; i++) {
Dc_FreeDcObj(so->list[i]);
}
dc_Free((void *) o);
}
}