mirror of
https://github.com/lua/lua
synced 2024-12-05 10:52:07 +03:00
196 lines
4.8 KiB
C
196 lines
4.8 KiB
C
/*
|
|
** $Id: lobject.c,v 1.95 2003/01/27 13:00:43 roberto Exp roberto $
|
|
** Some generic functions over Lua objects
|
|
** See Copyright Notice in lua.h
|
|
*/
|
|
|
|
#include <ctype.h>
|
|
#include <stdarg.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#define lobject_c
|
|
|
|
#include "lua.h"
|
|
|
|
#include "ldo.h"
|
|
#include "lmem.h"
|
|
#include "lobject.h"
|
|
#include "lstate.h"
|
|
#include "lstring.h"
|
|
#include "lvm.h"
|
|
|
|
|
|
/* function to convert a string to a lua_Number */
|
|
#ifndef lua_str2number
|
|
#define lua_str2number(s,p) strtod((s), (p))
|
|
#endif
|
|
|
|
|
|
const TObject luaO_nilobject = {LUA_TNIL, {NULL}};
|
|
|
|
|
|
/*
|
|
** converts an integer to a "floating point byte", represented as
|
|
** (mmmmmxxx), where the real value is (xxx) * 2^(mmmmm)
|
|
*/
|
|
int luaO_int2fb (unsigned int x) {
|
|
int m = 0; /* mantissa */
|
|
while (x >= (1<<3)) {
|
|
x = (x+1) >> 1;
|
|
m++;
|
|
}
|
|
return (m << 3) | cast(int, x);
|
|
}
|
|
|
|
|
|
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_rawequalObj (const TObject *t1, const TObject *t2) {
|
|
if (ttype(t1) != ttype(t2)) return 0;
|
|
else switch (ttype(t1)) {
|
|
case LUA_TNIL:
|
|
return 1;
|
|
case LUA_TNUMBER:
|
|
return nvalue(t1) == nvalue(t2);
|
|
case LUA_TBOOLEAN:
|
|
return bvalue(t1) == bvalue(t2); /* boolean true must be 1 !! */
|
|
case LUA_TLIGHTUSERDATA:
|
|
return pvalue(t1) == pvalue(t2);
|
|
default:
|
|
lua_assert(iscollectable(t1));
|
|
return gcvalue(t1) == gcvalue(t2);
|
|
}
|
|
}
|
|
|
|
|
|
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;
|
|
}
|
|
|
|
|
|
|
|
static void pushstr (lua_State *L, const char *str) {
|
|
setsvalue2s(L->top, luaS_new(L, str));
|
|
incr_top(L);
|
|
}
|
|
|
|
|
|
/* this function handles only `%d', `%c', %f, and `%s' formats */
|
|
const char *luaO_pushvfstring (lua_State *L, const char *fmt, va_list argp) {
|
|
int n = 1;
|
|
pushstr(L, "");
|
|
for (;;) {
|
|
const char *e = strchr(fmt, '%');
|
|
if (e == NULL) break;
|
|
setsvalue2s(L->top, luaS_newlstr(L, fmt, e-fmt));
|
|
incr_top(L);
|
|
switch (*(e+1)) {
|
|
case 's':
|
|
pushstr(L, va_arg(argp, char *));
|
|
break;
|
|
case 'c': {
|
|
char buff[2];
|
|
buff[0] = cast(char, va_arg(argp, int));
|
|
buff[1] = '\0';
|
|
pushstr(L, buff);
|
|
break;
|
|
}
|
|
case 'd':
|
|
setnvalue(L->top, va_arg(argp, int));
|
|
incr_top(L);
|
|
break;
|
|
case 'f':
|
|
setnvalue(L->top, va_arg(argp, l_uacNumber));
|
|
incr_top(L);
|
|
break;
|
|
case '%':
|
|
pushstr(L, "%");
|
|
break;
|
|
default: lua_assert(0);
|
|
}
|
|
n += 2;
|
|
fmt = e+2;
|
|
}
|
|
pushstr(L, fmt);
|
|
luaV_concat(L, n+1, L->top - L->base - 1);
|
|
L->top -= n;
|
|
return svalue(L->top - 1);
|
|
}
|
|
|
|
|
|
const char *luaO_pushfstring (lua_State *L, const char *fmt, ...) {
|
|
const char *msg;
|
|
va_list argp;
|
|
va_start(argp, fmt);
|
|
msg = luaO_pushvfstring(L, fmt, argp);
|
|
va_end(argp);
|
|
return msg;
|
|
}
|
|
|
|
|
|
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 { /* out = "source", or "...source" */
|
|
if (*source == '@') {
|
|
int l;
|
|
source++; /* skip the `@' */
|
|
bufflen -= sizeof(" `...' ");
|
|
l = strlen(source);
|
|
strcpy(out, "");
|
|
if (l>bufflen) {
|
|
source += (l-bufflen); /* get last part of file name */
|
|
strcat(out, "...");
|
|
}
|
|
strcat(out, source);
|
|
}
|
|
else { /* out = [string "string"] */
|
|
int len = strcspn(source, "\n"); /* stop at first newline */
|
|
bufflen -= sizeof(" [string \"...\"] ");
|
|
if (len > bufflen) len = bufflen;
|
|
strcpy(out, "[string \"");
|
|
if (source[len] != '\0') { /* must truncate? */
|
|
strncat(out, source, len);
|
|
strcat(out, "...");
|
|
}
|
|
else
|
|
strcat(out, source);
|
|
strcat(out, "\"]");
|
|
}
|
|
}
|
|
}
|