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/*
** $Id: lobject.c,v 1.47 2000/09/11 20:29:27 roberto Exp roberto $
** Some generic functions over Lua objects
** See Copyright Notice in lua.h
*/
#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "lua.h"
#include "lmem.h"
#include "lobject.h"
#include "lstate.h"
/*
** you can use the fact that the 3rd letter or each name is always different
** (e-m-r-b-n-l) to compare and switch these strings
*/
const char *const luaO_typenames[] = { /* ORDER LUA_T */
"userdata", "number", "string", "table", "function", "function", "nil",
"function", "function"
};
const TObject luaO_nilobject = {TAG_NIL, {NULL}};
/*
** returns smaller power of 2 larger than `n' (minimum is MINPOWER2)
*/
lint32 luaO_power2 (lint32 n) {
lint32 p = MINPOWER2;
while (p<=n) p<<=1;
return p;
}
int luaO_equalObj (const TObject *t1, const TObject *t2) {
if (ttype(t1) != ttype(t2)) return 0;
switch (ttype(t1)) {
case TAG_NUMBER:
return nvalue(t1) == nvalue(t2);
case TAG_STRING: case TAG_USERDATA:
return tsvalue(t1) == tsvalue(t2);
case TAG_TABLE:
return hvalue(t1) == hvalue(t2);
case TAG_CCLOSURE: case TAG_LCLOSURE:
return clvalue(t1) == clvalue(t2);
default:
LUA_ASSERT(ttype(t1) == TAG_NIL, "invalid type");
return 1; /* TAG_NIL */
}
}
char *luaO_openspace (lua_State *L, size_t n) {
if (n > L->Mbuffsize) {
luaM_reallocvector(L, L->Mbuffer, n, char);
L->Mbuffsize = n;
}
return L->Mbuffer;
}
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, Number *result) { /* LUA_NUMBER */
double a = 0.0;
int point = 0; /* number of decimal digits */
int sig;
while (isspace((unsigned char)*s)) s++;
sig = 0;
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++;
}
}
if (sig) a = -a;
if (*s == 'e' || *s == 'E') {
int e = 0;
s++;
sig = 0;
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));
if (sig) e = -e;
point -= 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;
}
/* this function needs to handle only '%d' and '%.XXXs' formats */
void luaO_verror (lua_State *L, const char *fmt, ...) {
char buff[500];
va_list argp;
va_start(argp, fmt);
vsprintf(buff, fmt, argp);
va_end(argp);
lua_error(L, buff);
}
#define EXTRALEN sizeof("string \"...\"0")
void luaO_chunkid (char *out, const char *source, int len) {
if (*source == '(') {
strncpy(out, source+1, len-1); /* remove first char */
out[len-1] = '\0'; /* make sure `out' has an end */
out[strlen(out)-1] = '\0'; /* remove last char */
}
else {
len -= EXTRALEN;
if (*source == '@')
sprintf(out, "file `%.*s'", len, source+1);
else {
const char *b = strchr(source , '\n'); /* stop at first new line */
int lim = (b && (b-source)<len) ? b-source : len;
sprintf(out, "string \"%.*s\"", lim, source);
strcpy(out+lim+(EXTRALEN-sizeof("...\"0")), "...\"");
}
}
}
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