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/*
** $Id: lobject.c,v 1.18 1999/02/26 15:48:30 roberto Exp roberto $
** Some generic functions over Lua objects
** See Copyright Notice in lua.h
*/
#include <ctype.h>
#include <stdlib.h>
#include "lobject.h"
#include "lua.h"
char *luaO_typenames[] = { /* ORDER LUA_T */
"userdata", "number", "string", "table", "function", "function",
"nil", "function", "mark", "mark", "mark", "line", NULL
};
TObject luaO_nilobject = {LUA_T_NIL, {NULL}};
/* hash dimensions values */
static long dimensions[] =
{5L, 11L, 23L, 47L, 97L, 197L, 397L, 797L, 1597L, 3203L, 6421L,
12853L, 25717L, 51437L, 102811L, 205619L, 411233L, 822433L,
1644817L, 3289613L, 6579211L, 13158023L, MAX_INT};
int luaO_redimension (int oldsize)
{
int i;
for (i=0; dimensions[i]<MAX_INT; i++) {
if (dimensions[i] > oldsize)
return dimensions[i];
}
lua_error("tableEM");
return 0; /* to avoid warnings */
}
int luaO_equalval (TObject *t1, TObject *t2) {
switch (ttype(t1)) {
case LUA_T_NIL: return 1;
case LUA_T_NUMBER: return nvalue(t1) == nvalue(t2);
case LUA_T_STRING: case LUA_T_USERDATA: return svalue(t1) == svalue(t2);
case LUA_T_ARRAY: return avalue(t1) == avalue(t2);
case LUA_T_PROTO: return tfvalue(t1) == tfvalue(t2);
case LUA_T_CPROTO: return fvalue(t1) == fvalue(t2);
case LUA_T_CLOSURE: return t1->value.cl == t2->value.cl;
default:
LUA_INTERNALERROR("invalid type");
return 0; /* UNREACHABLE */
}
}
void luaO_insertlist (GCnode *root, GCnode *node)
{
node->next = root->next;
root->next = node;
node->marked = 0;
}
#ifdef OLD_ANSI
void luaO_memup (void *dest, void *src, int size) {
while (size--)
((char *)dest)[size]=((char *)src)[size];
}
void luaO_memdown (void *dest, void *src, int size) {
int i;
for (i=0; i<size; i++)
((char *)dest)[i]=((char *)src)[i];
}
#endif
static double expten (unsigned int e) {
double exp = 10.0;
double res = 1.0;
for (; e; e>>=1) {
if (e & 1) res *= exp;
exp *= exp;
}
return res;
}
double luaO_str2d (char *s) { /* LUA_NUMBER */
double a = 0.0;
int point = 0;
while (isdigit((unsigned char)*s)) {
a = 10.0*a + (*(s++)-'0');
}
if (*s == '.') {
s++;
while (isdigit((unsigned char)*s)) {
a = 10.0*a + (*(s++)-'0');
point++;
}
}
if (toupper((unsigned char)*s) == 'E') {
int e = 0;
int sig = 1;
s++;
if (*s == '-') {
s++;
sig = -1;
}
else if (*s == '+') s++;
if (!isdigit((unsigned char)*s)) return -1; /* no digit in the exponent? */
do {
e = 10*e + (*(s++)-'0');
} while (isdigit((unsigned char)*s));
point -= sig*e;
}
while (isspace((unsigned char)*s)) s++;
if (*s != '\0') return -1; /* invalid trailing characters? */
if (point > 0)
a /= expten(point);
else if (point < 0)
a *= expten(-point);
return a;
}
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