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/*
** $Id: lobject.c,v 1.26 1999/11/26 18:59:20 roberto Exp roberto $
** Some generic functions over Lua objects
** See Copyright Notice in lua.h
*/
#include <ctype.h>
#include <stdlib.h>
#define LUA_REENTRANT
#include "lobject.h"
#include "lua.h"
const char *const luaO_typenames[] = { /* ORDER LUA_T */
"userdata", "number", "string", "table", "function", "function",
"nil", "function", "mark", "mark", "mark", "line", NULL
};
const TObject luaO_nilobject = {LUA_T_NIL, {NULL}};
/*
** returns smaller power of 2 larger than `n' (minimum is MINPOWER2)
*/
unsigned long luaO_power2 (unsigned long n) {
unsigned long p = MINPOWER2;
while (p<=n) p<<=1;
return p;
}
int luaO_equalval (const TObject *t1, const 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(L, "invalid type");
return 0; /* UNREACHABLE */
}
}
#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;
}
int luaO_str2d (const char *s, real *result) { /* LUA_NUMBER */
double a = 0.0;
int point = 0; /* number of decimal digits */
int sig;
while (isspace((unsigned char)*s)) s++;
sig = 1;
switch (*s) {
case '-': sig = -1; /* go through */
case '+': s++;
}
if (! (isdigit((unsigned char)*s) ||
(*s == '.' && isdigit((unsigned char)*(s+1)))))
return 0; /* not (at least one digit before or after the point) */
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++;
}
}
a *= sig;
if (toupper((unsigned char)*s) == 'E') {
int e = 0;
s++;
sig = 1;
switch (*s) {
case '-': sig = -1; /* go through */
case '+': s++;
}
if (!isdigit((unsigned char)*s)) return 0; /* 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 0; /* invalid trailing characters? */
if (point != 0) {
if (point > 0) a /= expten(point);
else a *= expten(-point);
}
*result = a;
return 1;
}
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