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79c26560e22a445fcdbc4db0c8f5ccdb226fba8a
xen/tools/libxutil/sxpr.c
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mjw@wray-m-3.hpl.hp.com 4b64c0d7ea bitkeeper revision 1.1159.183.2 (41a216ce6YIv6IWbateVWedQylK5rA) 
Restructure libxutil to prepare for adding vnets.
Move common files from xfrd into libxutil.
2004-11-22 16:41:50 +00:00

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/*
* Copyright (C) 2001 - 2004 Mike Wray <mike.wray@hp.com>
*
* 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
*/
#include <stdarg.h>
#include "sys_string.h"
#include "lexis.h"
#include "sys_net.h"
#include "hash_table.h"
#include "sxpr.h"
#ifdef __KERNEL__
#include <linux/errno.h>
#else
#include <errno.h>
#endif
#undef free
/** @file
* General representation of sxprs.
* Includes print, equal, and free functions for the sxpr types.
*
* Zero memory containing an Sxpr will have the value ONONE - this is intentional.
* When a function returning an sxpr cannot allocate memory we return ONOMEM.
*
*/
static int atom_print(IOStream *io, Sxpr obj, unsigned flags);
static int atom_equal(Sxpr x, Sxpr y);
static void atom_free(Sxpr obj);
static int string_print(IOStream *io, Sxpr obj, unsigned flags);
static int string_equal(Sxpr x, Sxpr y);
static void string_free(Sxpr obj);
static int cons_print(IOStream *io, Sxpr obj, unsigned flags);
static int cons_equal(Sxpr x, Sxpr y);
static void cons_free(Sxpr obj);
static int null_print(IOStream *io, Sxpr obj, unsigned flags);
static int none_print(IOStream *io, Sxpr obj, unsigned flags);
static int int_print(IOStream *io, Sxpr obj, unsigned flags);
static int bool_print(IOStream *io, Sxpr obj, unsigned flags);
/** Type definitions. */
static SxprType types[1024] = {
[T_NONE] { type: T_NONE, name: "none", print: none_print },
[T_NULL] { type: T_NULL, name: "null", print: null_print },
[T_UINT] { type: T_UINT, name: "int", print: int_print, },
[T_BOOL] { type: T_BOOL, name: "bool", print: bool_print, },
[T_ATOM] { type: T_ATOM, name: "atom", print: atom_print,
pointer: TRUE,
free: atom_free,
equal: atom_equal,
},
[T_STRING] { type: T_STRING, name: "string", print: string_print,
pointer: TRUE,
free: string_free,
equal: string_equal,
},
[T_CONS] { type: T_CONS, name: "cons", print: cons_print,
pointer: TRUE,
free: cons_free,
equal: cons_equal,
},
};
/** Number of entries in the types array. */
static int type_sup = sizeof(types)/sizeof(types[0]);
/** Get the type definition for a given type code.
*
* @param ty type code
* @return type definition or null
*/
SxprType *get_sxpr_type(int ty){
if(0 <= ty && ty < type_sup){
return types+ty;
}
return NULL;
}
/** The default print function.
*
* @param io stream to print to
* @param x sxpr to print
* @param flags print flags
* @return number of bytes written on success
*/
int default_print(IOStream *io, Sxpr x, unsigned flags){
return IOStream_print(io, "#<%u %lu>\n", get_type(x), get_ul(x));
}
/** The default equal function.
* Uses eq().
*
* @param x sxpr to compare
* @param y sxpr to compare
* @return 1 if equal, 0 otherwise
*/
int default_equal(Sxpr x, Sxpr y){
return eq(x, y);
}
/** General sxpr print function.
* Prints an sxpr on a stream using the print function for the sxpr type.
* Printing is controlled by flags from the PrintFlags enum.
* If PRINT_TYPE is in the flags the sxpr type is printed before the sxpr
* (for debugging).
*
* @param io stream to print to
* @param x sxpr to print
* @param flags print flags
* @return number of bytes written
*/
int objprint(IOStream *io, Sxpr x, unsigned flags){
SxprType *def = get_sxpr_type(get_type(x));
ObjPrintFn *print_fn = (def && def->print ? def->print : default_print);
int k = 0;
if(!io) return k;
if(flags & PRINT_TYPE){
k += IOStream_print(io, "%s:", def->name);
}
k += print_fn(io, x, flags);
return k;
}
/** General sxpr free function.
* Frees an sxpr using the free function for its type.
* Free functions must recursively free any subsxprs.
* If no function is defined then the default is to
* free sxprs whose type has pointer true.
* Sxprs must not be used after freeing.
*
* @param x sxpr to free
*/
void objfree(Sxpr x){
SxprType *def = get_sxpr_type(get_type(x));
if(def){
if(def->free){
def->free(x);
} else if (def->pointer){
hfree(x);
}
}
}
/** General sxpr equality function.
* Compares x and y using the equal function for x.
* Uses default_equal() if x has no equal function.
*
* @param x sxpr to compare
* @param y sxpr to compare
* @return 1 if equal, 0 otherwise
*/
int objequal(Sxpr x, Sxpr y){
SxprType *def = get_sxpr_type(get_type(x));
ObjEqualFn *equal_fn = (def && def->equal ? def->equal : default_equal);
return equal_fn(x, y);
}
/** Search for a key in an alist.
* An alist is a list of conses, where the cars
* of the conses are the keys. Compares keys using equality.
*
* @param k key
* @param l alist to search
* @return first element of l with car k, or ONULL
*/
Sxpr assoc(Sxpr k, Sxpr l){
for( ; CONSP(l) ; l = CDR(l)){
Sxpr x = CAR(l);
if(CONSP(x) && objequal(k, CAR(x))){
return x;
}
}
return ONULL;
}
/** Search for a key in an alist.
* An alist is a list of conses, where the cars
* of the conses are the keys. Compares keys using eq.
*
* @param k key
* @param l alist to search
* @return first element of l with car k, or ONULL
*/
Sxpr assocq(Sxpr k, Sxpr l){
for( ; CONSP(l); l = CDR(l)){
Sxpr x = CAR(l);
if(CONSP(x) && eq(k, CAR(x))){
return x;
}
}
return ONULL;
}
/** Add a new key and value to an alist.
*
* @param k key
* @param l value
* @param l alist
* @return l with the new cell added to the front
*/
Sxpr acons(Sxpr k, Sxpr v, Sxpr l){
Sxpr x, y;
x = cons_new(k, v);
if(NOMEMP(x)) return x;
y = cons_new(x, l);
if(NOMEMP(y)) cons_free_cells(x);
return y;
}
/** Test if a list contains an element.
* Uses sxpr equality.
*
* @param l list
* @param x element to look for
* @return a tail of l with x as car, or ONULL
*/
Sxpr cons_member(Sxpr l, Sxpr x){
for( ; CONSP(l) && !eq(x, CAR(l)); l = CDR(l)){}
return l;
}
/** Test if a list contains an element satisfying a test.
* The test function is called with v and an element of the list.
*
* @param l list
* @param test_fn test function to use
* @param v value for first argument to the test
* @return a tail of l with car satisfying the test, or 0
*/
Sxpr cons_member_if(Sxpr l, ObjEqualFn *test_fn, Sxpr v){
for( ; CONSP(l) && !test_fn(v, CAR(l)); l = CDR(l)){ }
return l;
}
/** Test if the elements of list 't' are a subset of the elements
* of list 's'. Element order is not significant.
*
* @param s element list to check subset of
* @param t element list to check if is a subset
* @return 1 if is a subset, 0 otherwise
*/
int cons_subset(Sxpr s, Sxpr t){
for( ; CONSP(t); t = CDR(t)){
if(!CONSP(cons_member(s, CAR(t)))){
return 0;
}
}
return 1;
}
/** Test if two lists have equal sets of elements.
* Element order is not significant.
*
* @param s list to check
* @param t list to check
* @return 1 if equal, 0 otherwise
*/
int cons_set_equal(Sxpr s, Sxpr t){
return cons_subset(s, t) && cons_subset(t, s);
}
#ifdef USE_GC
/*============================================================================*/
/* The functions inside this ifdef are only safe if GC is used.
* Otherwise they may leak memory.
*/
/** Remove an element from a list (GC only).
* Uses sxpr equality and removes all instances, even
* if there are more than one.
*
* @param l list to remove elements from
* @param x element to remove
* @return modified input list
*/
Sxpr cons_remove(Sxpr l, Sxpr x){
return cons_remove_if(l, eq, x);
}
/** Remove elements satisfying a test (GC only).
* The test function is called with v and an element of the set.
*
* @param l list to remove elements from
* @param test_fn function to use to decide if an element should be removed
* @return modified input list
*/
Sxpr cons_remove_if(Sxpr l, ObjEqualFn *test_fn, Sxpr v){
Sxpr prev = ONULL, elt, next;
for(elt = l; CONSP(elt); elt = next){
next = CDR(elt);
if(test_fn(v, CAR(elt))){
if(NULLP(prev)){
l = next;
} else {
CDR(prev) = next;
}
}
}
return l;
}
/** Set the value for a key in an alist (GC only).
* If the key is present, changes the value, otherwise
* adds a new cell.
*
* @param k key
* @param v value
* @param l alist
* @return modified or extended list
*/
Sxpr setf(Sxpr k, Sxpr v, Sxpr l){
Sxpr e = assoc(k, l);
if(NULLP(e)){
l = acons(k, v, l);
} else {
CAR(CDR(e)) = v;
}
return l;
}
/*============================================================================*/
#endif /* USE_GC */
/** Create a new atom with the given name.
*
* @param name the name
* @return new atom
*/
Sxpr atom_new(char *name){
Sxpr n, obj = ONOMEM;
n = string_new(name);
if(NOMEMP(n)) goto exit;
obj = HALLOC(ObjAtom, T_ATOM);
if(NOMEMP(obj)) goto exit;
OBJ_ATOM(obj)->name = n;
exit:
return obj;
}
/** Free an atom.
*
* @param obj to free
*/
void atom_free(Sxpr obj){
// Interned atoms are shared, so do not free.
if(OBJ_ATOM(obj)->interned) return;
objfree(OBJ_ATOM(obj)->name);
hfree(obj);
}
/** Print an atom. Prints the atom name.
*
* @param io stream to print to
* @param obj to print
* @param flags print flags
* @return number of bytes printed
*/
int atom_print(IOStream *io, Sxpr obj, unsigned flags){
//return string_print(io, OBJ_ATOM(obj)->name, (flags | PRINT_RAW));
return string_print(io, OBJ_ATOM(obj)->name, flags);
}
/** Atom equality.
*
* @param x to compare
* @param y to compare
* @return 1 if equal, 0 otherwise
*/
int atom_equal(Sxpr x, Sxpr y){
int ok;
ok = eq(x, y);
if(ok) goto exit;
ok = ATOMP(y) && string_equal(OBJ_ATOM(x)->name, OBJ_ATOM(y)->name);
if(ok) goto exit;
ok = STRINGP(y) && string_equal(OBJ_ATOM(x)->name, y);
exit:
return ok;
}
/** Get the name of an atom.
*
* @param obj atom
* @return name
*/
char * atom_name(Sxpr obj){
return string_string(OBJ_ATOM(obj)->name);
}
/** Get the C string from a string sxpr.
*
* @param obj string sxpr
* @return string
*/
char * string_string(Sxpr obj){
return OBJ_STRING(obj);
}
/** Get the length of a string.
*
* @param obj string
* @return length
*/
int string_length(Sxpr obj){
return strlen(OBJ_STRING(obj));
}
/** Create a new string. The input string is copied,
* and must be null-terminated.
*
* @param s characters to put in the string
* @return new sxpr
*/
Sxpr string_new(char *s){
int n = (s ? strlen(s) : 0);
Sxpr obj;
obj = halloc(n+1, T_STRING);
if(!NOMEMP(obj)){
char *str = OBJ_STRING(obj);
strncpy(str, s, n);
str[n] = '\0';
}
return obj;
}
/** Free a string.
*
* @param obj to free
*/
void string_free(Sxpr obj){
hfree(obj);
}
/** Determine if a string needs escapes when printed
* using the given flags.
*
* @param str string to check
* @param flags print flags
* @return 1 if needs escapes, 0 otherwise
*/
int needs_escapes(char *str, unsigned flags){
char *c;
int val = 0;
if(str){
for(c=str; *c; c++){
if(in_alpha_class(*c)) continue;
if(in_decimal_digit_class(*c)) continue;
if(in_class(*c, "/._+:@~-")) continue;
val = 1;
break;
}
}
//printf("\n> val=%d str=|%s|\n", val, str);
return val;
}
/** Print a string to a stream, with escapes if necessary.
*
* @param io stream to print to
* @param str string
* @param flags print flags
* @return number of bytes written
*/
int _string_print(IOStream *io, char *str, unsigned flags){
int k = 0;
if((flags & PRINT_RAW) || !needs_escapes(str, flags)){
k += IOStream_print(io, str);
} else {
k += IOStream_print(io, "\"");
if(str){
char *s;
for(s = str; *s; s++){
if(*s < ' ' || *s >= 127 ){
switch(*s){
case '\a': k += IOStream_print(io, "\\a"); break;
case '\b': k += IOStream_print(io, "\\b"); break;
case '\f': k += IOStream_print(io, "\\f"); break;
case '\n': k += IOStream_print(io, "\\n"); break;
case '\r': k += IOStream_print(io, "\\r"); break;
case '\t': k += IOStream_print(io, "\\t"); break;
case '\v': k += IOStream_print(io, "\\v"); break;
default:
// Octal escape;
k += IOStream_print(io, "\\%o", *s);
break;
}
} else if(*s == c_double_quote ||
*s == c_single_quote ||
*s == c_escape){
k += IOStream_print(io, "\\%c", *s);
} else {
k+= IOStream_print(io, "%c", *s);
}
}
}
k += IOStream_print(io, "\"");
}
return k;
}
/** Print a string to a stream, with escapes if necessary.
*
* @param io stream to print to
* @param obj string
* @param flags print flags
* @return number of bytes written
*/
int string_print(IOStream *io, Sxpr obj, unsigned flags){
return _string_print(io, OBJ_STRING(obj), flags);
}
/** Compare an sxpr with a string for equality.
*
* @param x string to compare with
* @param y sxpr to compare
* @return 1 if equal, 0 otherwise
*/
int string_equal(Sxpr x, Sxpr y){
int ok = 0;
ok = eq(x,y);
if(ok) goto exit;
ok = has_type(y, T_STRING) && !strcmp(OBJ_STRING(x), OBJ_STRING(y));
if(ok) goto exit;
ok = has_type(y, T_ATOM) && !strcmp(OBJ_STRING(x), atom_name(y));
exit:
return ok;
}
/** Create a new cons cell.
* The cell is ONOMEM if either argument is.
*
* @param car sxpr for the car
* @param cdr sxpr for the cdr
* @return new cons
*/
Sxpr cons_new(Sxpr car, Sxpr cdr){
Sxpr obj;
if(NOMEMP(car) || NOMEMP(cdr)){
obj = ONOMEM;
} else {
obj = HALLOC(ObjCons, T_CONS);
if(!NOMEMP(obj)){
ObjCons *z = OBJ_CONS(obj);
z->car = car;
z->cdr = cdr;
}
}
return obj;
}
/** Push a new element onto a list.
*
* @param list list to add to
* @param elt element to add
* @return 0 if successful, error code otherwise
*/
int cons_push(Sxpr *list, Sxpr elt){
Sxpr l;
l = cons_new(elt, *list);
if(NOMEMP(l)) return -ENOMEM;
*list = l;
return 0;
}
/** Free a cons. Recursively frees the car and cdr.
*
* @param obj to free
*/
void cons_free(Sxpr obj){
Sxpr next;
for(; CONSP(obj); obj = next){
next = CDR(obj);
objfree(CAR(obj));
hfree(obj);
}
if(!NULLP(obj)){
objfree(obj);
}
}
/** Free a cons and its cdr cells, but not the car sxprs.
* Does nothing if called on something that is not a cons.
*
* @param obj to free
*/
void cons_free_cells(Sxpr obj){
Sxpr next;
for(; CONSP(obj); obj = next){
next = CDR(obj);
hfree(obj);
}
}
/** Print a cons.
* Prints the cons in list format if the cdrs are conses.
* uses pair (dot) format if the last cdr is not a cons (or null).
*
* @param io stream to print to
* @param obj to print
* @param flags print flags
* @return number of bytes written
*/
int cons_print(IOStream *io, Sxpr obj, unsigned flags){
int first = 1;
int k = 0;
k += IOStream_print(io, "(");
for( ; CONSP(obj) ; obj = CDR(obj)){
if(first){
first = 0;
} else {
k += IOStream_print(io, " ");
}
k += objprint(io, CAR(obj), flags);
}
if(!NULLP(obj)){
k += IOStream_print(io, " . ");
k += objprint(io, obj, flags);
}
k += IOStream_print(io, ")");
return (IOStream_error(io) ? -1 : k);
}
/** Compare a cons with another sxpr for equality.
* If y is a cons, compares the cars and cdrs recursively.
*
* @param x cons to compare
* @param y sxpr to compare
* @return 1 if equal, 0 otherwise
*/
int cons_equal(Sxpr x, Sxpr y){
return CONSP(y) &&
objequal(CAR(x), CAR(y)) &&
objequal(CDR(x), CDR(y));
}
/** Return the length of a cons list.
*
* @param obj list
* @return length
*/
int cons_length(Sxpr obj){
int count = 0;
for( ; CONSP(obj); obj = CDR(obj)){
count++;
}
return count;
}
/** Destructively reverse a cons list in-place.
* If the argument is not a cons it is returned unchanged.
*
* @param l to reverse
* @return reversed list
*/
Sxpr nrev(Sxpr l){
if(CONSP(l)){
// Iterate down the cells in the list making the cdr of
// each cell point to the previous cell. The last cell
// is the head of the reversed list.
Sxpr prev = ONULL;
Sxpr cell = l;
Sxpr next;
while(1){
next = CDR(cell);
CDR(cell) = prev;
if(!CONSP(next)) break;
prev = cell;
cell = next;
}
l = cell;
}
return l;
}
/** Print the null sxpr.
*
* @param io stream to print to
* @param obj to print
* @param flags print flags
* @return number of bytes written
*/
static int null_print(IOStream *io, Sxpr obj, unsigned flags){
return IOStream_print(io, "()");
}
/** Print the `unspecified' sxpr none.
*
* @param io stream to print to
* @param obj to print
* @param flags print flags
* @return number of bytes written
*/
static int none_print(IOStream *io, Sxpr obj, unsigned flags){
return IOStream_print(io, "<none>");
}
/** Print an integer.
*
* @param io stream to print to
* @param obj to print
* @param flags print flags
* @return number of bytes written
*/
static int int_print(IOStream *io, Sxpr obj, unsigned flags){
return IOStream_print(io, "%d", OBJ_INT(obj));
}
/** Print a boolean.
*
* @param io stream to print to
* @param obj to print
* @param flags print flags
* @return number of bytes written
*/
static int bool_print(IOStream *io, Sxpr obj, unsigned flags){
return IOStream_print(io, (OBJ_UINT(obj) ? k_true : k_false));
}
int sxprp(Sxpr obj, Sxpr name){
return CONSP(obj) && objequal(CAR(obj), name);
}
/** Get the name of an element.
*
* @param obj element
* @return name
*/
Sxpr sxpr_name(Sxpr obj){
Sxpr val = ONONE;
if(CONSP(obj)){
val = CAR(obj);
} else if(STRINGP(obj) || ATOMP(obj)){
val = obj;
}
return val;
}
int sxpr_is(Sxpr obj, char *s){
if(ATOMP(obj)) return !strcmp(atom_name(obj), s);
if(STRINGP(obj)) return !strcmp(string_string(obj), s);
return 0;
}
int sxpr_elementp(Sxpr obj, Sxpr name){
int ok = 0;
ok = CONSP(obj) && objequal(CAR(obj), name);
return ok;
}
/** Get the attributes of an sxpr.
*
* @param obj sxpr
* @return attributes
*/
Sxpr sxpr_attributes(Sxpr obj){
Sxpr val = ONULL;
if(CONSP(obj)){
obj = CDR(obj);
if(CONSP(obj)){
obj = CAR(obj);
if(sxprp(obj, intern("@"))){
val = CDR(obj);
}
}
}
return val;
}
Sxpr sxpr_attribute(Sxpr obj, Sxpr key, Sxpr def){
Sxpr val = ONONE;
val = assoc(sxpr_attributes(obj), key);
if(CONSP(val) && CONSP(CDR(val))){
val = CADR(def);
} else {
val = def;
}
return val;
}
/** Get the children of an sxpr.
*
* @param obj sxpr
* @return children
*/
Sxpr sxpr_children(Sxpr obj){
Sxpr val = ONULL;
if(CONSP(obj)){
val = CDR(obj);
if(CONSP(val) && sxprp(CAR(val), intern("@"))){
val = CDR(val);
}
}
return val;
}
Sxpr sxpr_child(Sxpr obj, Sxpr name, Sxpr def){
Sxpr val = ONONE;
Sxpr l;
for(l = sxpr_children(obj); CONSP(l); l = CDR(l)){
if(sxprp(CAR(l), name)){
val = CAR(l);
break;
}
}
if(NONEP(val)) val = def;
return val;
}
Sxpr sxpr_child0(Sxpr obj, Sxpr def){
Sxpr val = ONONE;
Sxpr l = sxpr_children(obj);
if(CONSP(l)){
val = CAR(l);
} else {
val = def;
}
return val;
}
Sxpr sxpr_childN(Sxpr obj, int n, Sxpr def){
Sxpr val = def;
Sxpr l;
int i;
for (i = 0, l = sxpr_children(obj); CONSP(l); i++, l = CDR(l)){
if(i == n){
val = CAR(l);
break;
}
}
return val;
}
Sxpr sxpr_child_value(Sxpr obj, Sxpr name, Sxpr def){
Sxpr val = ONONE;
val = sxpr_child(obj, name, ONONE);
if(NONEP(val)){
val = def;
} else {
val = sxpr_child0(val, def);
}
return val;
}
/** Table of interned symbols. Indexed by symbol name. */
static HashTable *symbols = NULL;
/** Hash function for entries in the symbol table.
*
* @param key to hash
* @return hashcode
*/
static Hashcode sym_hash_fn(void *key){
return hash_string((char*)key);
}
/** Key equality function for the symbol table.
*
* @param x to compare
* @param y to compare
* @return 1 if equal, 0 otherwise
*/
static int sym_equal_fn(void *x, void *y){
return !strcmp((char*)x, (char*)y);
}
/** Entry free function for the symbol table.
*
* @param table the entry is in
* @param entry being freed
*/
static void sym_free_fn(HashTable *table, HTEntry *entry){
if(entry){
objfree(((ObjAtom*)entry->value)->name);
HTEntry_free(entry);
}
}
/** Initialize the symbol table.
*
* @return 0 on sucess, error code otherwise
*/
static int init_symbols(void){
symbols = HashTable_new(100);
if(symbols){
symbols->key_hash_fn = sym_hash_fn;
symbols->key_equal_fn = sym_equal_fn;
symbols->entry_free_fn = sym_free_fn;
return 0;
}
return -1;
}
/** Cleanup the symbol table. Frees the table and all its symbols.
*/
void cleanup_symbols(void){
HashTable_free(symbols);
symbols = NULL;
}
/** Get the interned symbol with the given name.
* No new symbol is created.
*
* @return symbol or null
*/
Sxpr get_symbol(char *sym){
HTEntry *entry;
if(!symbols){
if(init_symbols()) return ONOMEM;
return ONULL;
}
entry = HashTable_get_entry(symbols, sym);
if(entry){
return OBJP(T_ATOM, entry->value);
} else {
return ONULL;
}
}
/** Get the interned symbol with the given name.
* Creates a new symbol if necessary.
*
* @return symbol
*/
Sxpr intern(char *sym){
Sxpr symbol = get_symbol(sym);
if(NULLP(symbol)){
if(!symbols) return ONOMEM;
symbol = atom_new(sym);
if(!NOMEMP(symbol)){
OBJ_ATOM(symbol)->interned = TRUE;
HashTable_add(symbols, atom_name(symbol), get_ptr(symbol));
}
}
return symbol;
}
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