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/*
** $Id: lobject.c,v 1.75 2002/02/07 17:25:12 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 "ldo.h"
#include "lmem.h"
#include "lobject.h"
#include "lstate.h"
const TObject luaO_nilobject = {LUA_TNIL, {NULL}};
int luaO_log2 (unsigned int x) {
static const lu_byte log_8[255] = {
0,
1,1,
2,2,2,2,
3,3,3,3,3,3,3,3,
4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7
};
if (x >= 0x00010000) {
if (x >= 0x01000000) return log_8[((x>>24) & 0xff) - 1]+24;
else return log_8[((x>>16) & 0xff) - 1]+16;
}
else {
if (x >= 0x00000100) return log_8[((x>>8) & 0xff) - 1]+8;
else if (x) return log_8[(x & 0xff) - 1];
return -1; /* special `log' for 0 */
}
}
int luaO_equalObj (const TObject *t1, const TObject *t2) {
if (ttype(t1) != ttype(t2)) return 0;
switch (ttype(t1)) {
case LUA_TNUMBER:
return nvalue(t1) == nvalue(t2);
case LUA_TNIL:
return 1;
case LUA_TBOOLEAN:
return bvalue(t1) == bvalue(t2); /* true must be 1 !! */
case LUA_TUDATAVAL:
return pvalue(t1) == pvalue(t2);
default: /* other types are equal if struct pointers are equal */
return tsvalue(t1) == tsvalue(t2);
}
}
void *luaO_openspaceaux (lua_State *L, size_t n) {
if (n > G(L)->Mbuffsize) {
G(L)->Mbuffer = luaM_realloc(L, G(L)->Mbuffer, G(L)->Mbuffsize, n);
G(L)->Mbuffsize = n;
}
return G(L)->Mbuffer;
}
int luaO_str2d (const char *s, lua_Number *result) {
char *endptr;
lua_Number res = lua_str2number(s, &endptr);
if (endptr == s) return 0; /* no conversion */
while (isspace((unsigned char)(*endptr))) endptr++;
if (*endptr != '\0') return 0; /* invalid trailing characters? */
*result = res;
return 1;
}
/* maximum length of a string format for `luaO_verror' */
#define MAX_VERROR 280
/* this function needs to handle only '%d' and '%.XXs' formats */
void luaO_verror (lua_State *L, const char *fmt, ...) {
va_list argp;
char buff[MAX_VERROR]; /* to hold formatted message */
va_start(argp, fmt);
vsprintf(buff, fmt, argp);
va_end(argp);
luaD_error(L, buff);
}
void luaO_chunkid (char *out, const char *source, int bufflen) {
if (*source == '=') {
strncpy(out, source+1, bufflen); /* remove first char */
out[bufflen-1] = '\0'; /* ensures null termination */
}
else {
if (*source == '@') {
int l;
source++; /* skip the `@' */
bufflen -= sizeof("file `...%s'");
l = strlen(source);
if (l>bufflen) {
source += (l-bufflen); /* get last part of file name */
sprintf(out, "file `...%.99s'", source);
}
else
sprintf(out, "file `%.99s'", source);
}
else {
int len = strcspn(source, "\n"); /* stop at first newline */
bufflen -= sizeof("string \"%.*s...\"");
if (len > bufflen) len = bufflen;
if (source[len] != '\0') { /* must truncate? */
strcpy(out, "string \"");
out += strlen(out);
strncpy(out, source, len);
strcpy(out+len, "...\"");
}
else
sprintf(out, "string \"%.99s\"", source);
}
}
}
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