static int equal(naRef a, naRef b)
{
if(IS_NUM(a)) return a.num == b.num;
if(PTR(a).obj == PTR(b).obj) return 1;
if(naStr_len(a) != naStr_len(b)) return 0;
return memcmp(naStr_data(a), naStr_data(b), naStr_len(a)) == 0;
}
static naRef f_write(naContext c, naRef me, int argc, naRef* args)
{
struct naIOGhost* g = argc > 0 ? ioghost(args[0]) : 0;
naRef str = argc > 1 ? args[1] : naNil();
if(!g || !IS_STR(str))
naRuntimeError(c, "bad argument to write()");
return naNum(g->type->write(c, g->handle, naStr_data(str),
naStr_len(str)));
}
static naRef f_setfld(naContext c, naRef me, int argc, naRef* args)
{
naRef s = argc > 0 ? args[0] : naNil();
int bit = argc > 1 ? (int)naNumValue(args[1]).num : -1;
int len = argc > 2 ? (int)naNumValue(args[2]).num : -1;
naRef val = argc > 3 ? naNumValue(args[3]) : naNil();
if(!argc || !MUTABLE(args[0])|| bit < 0 || len < 0 || IS_NIL(val))
naRuntimeError(c, "missing/bad argument to setfld");
setfld(c, (void*)naStr_data(s), naStr_len(s), bit, len, (unsigned int)val.num);
return naNil();
}
static naRef f_read(naContext c, naRef me, int argc, naRef* args)
{
struct naIOGhost* g = argc > 0 ? ioghost(args[0]) : 0;
naRef str = argc > 1 ? args[1] : naNil();
naRef len = argc > 2 ? naNumValue(args[2]) : naNil();
if(!g || !MUTABLE(str) || !IS_NUM(len))
naRuntimeError(c, "bad argument to read()");
if(naStr_len(str) < (int)len.num)
naRuntimeError(c, "string not big enough for read");
return naNum(g->type->read(c, g->handle, naStr_data(str),
(int)len.num));
}
static unsigned int refhash(naRef key)
{
if(IS_STR(key)) {
struct naStr* s = PTR(key).str;
if(s->hashcode) return s->hashcode;
return s->hashcode = hash32((void*)naStr_data(key), naStr_len(key));
} else { /* must be a number */
union { double d; unsigned int u[2]; } n;
n.d = key.num == -0.0 ? 0.0 : key.num; /* remember negative zero! */
return mix32(mix32(n.u[0]) ^ n.u[1]);
}
}
static naRef dofld(naContext c, int argc, naRef* args, int sign)
{
naRef s = argc > 0 ? args[0] : naNil();
int bit = argc > 1 ? (int)naNumValue(args[1]).num : -1;
int len = argc > 2 ? (int)naNumValue(args[2]).num : -1;
unsigned int f;
if(!naIsString(s) || !MUTABLE(args[0]) || bit < 0 || len < 0)
naRuntimeError(c, "missing/bad argument to fld/sfld");
f = fld(c, (void*)naStr_data(s), naStr_len(s), bit, len);
if(!sign) return naNum(f);
if(f & (1 << (len-1))) f |= ~((1<<len)-1); // sign extend
return naNum((signed int)f);
}
