1997-09-16 23:25:59 +04:00
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/*
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2003-02-18 19:02:56 +03:00
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** $Id: lobject.c,v 1.95 2003/01/27 13:00:43 roberto Exp roberto $
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1997-09-16 23:25:59 +04:00
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** Some generic functions over Lua objects
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** See Copyright Notice in lua.h
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*/
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1998-12-27 23:25:20 +03:00
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#include <ctype.h>
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2000-09-12 00:29:27 +04:00
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#include <stdarg.h>
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1997-09-16 23:25:59 +04:00
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#include <stdlib.h>
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2000-09-12 00:29:27 +04:00
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#include <string.h>
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1997-09-16 23:25:59 +04:00
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2002-12-04 20:38:31 +03:00
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#define lobject_c
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1997-09-16 23:25:59 +04:00
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#include "lua.h"
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2001-01-24 18:45:33 +03:00
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#include "ldo.h"
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2000-09-11 21:38:42 +04:00
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#include "lmem.h"
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2000-06-12 17:52:05 +04:00
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#include "lobject.h"
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2000-09-11 21:38:42 +04:00
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#include "lstate.h"
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2002-05-07 21:36:56 +04:00
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#include "lstring.h"
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#include "lvm.h"
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2000-06-12 17:52:05 +04:00
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1997-09-16 23:25:59 +04:00
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2002-06-05 16:34:19 +04:00
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/* function to convert a string to a lua_Number */
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#ifndef lua_str2number
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#define lua_str2number(s,p) strtod((s), (p))
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#endif
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2000-10-03 00:10:55 +04:00
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2001-02-02 18:13:05 +03:00
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const TObject luaO_nilobject = {LUA_TNIL, {NULL}};
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1997-09-16 23:25:59 +04:00
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2003-02-18 19:02:56 +03:00
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/*
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** converts an integer to a "floating point byte", represented as
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** (mmmmmxxx), where the real value is (xxx) * 2^(mmmmm)
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*/
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int luaO_int2fb (unsigned int x) {
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int m = 0; /* mantissa */
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while (x >= (1<<3)) {
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x = (x+1) >> 1;
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m++;
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}
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return (m << 3) | cast(int, x);
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}
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2001-10-25 23:14:14 +04:00
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int luaO_log2 (unsigned int x) {
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static const lu_byte log_8[255] = {
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0,
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1,1,
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2,2,2,2,
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3,3,3,3,3,3,3,3,
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4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
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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,
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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,
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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,
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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,
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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,
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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,
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2002-01-30 20:28:05 +03:00
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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
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2001-10-25 23:14:14 +04:00
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};
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2002-01-30 20:28:05 +03:00
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if (x >= 0x00010000) {
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if (x >= 0x01000000) return log_8[((x>>24) & 0xff) - 1]+24;
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2001-10-25 23:14:14 +04:00
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else return log_8[((x>>16) & 0xff) - 1]+16;
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}
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else {
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2002-01-30 20:28:05 +03:00
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if (x >= 0x00000100) return log_8[((x>>8) & 0xff) - 1]+8;
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2001-10-25 23:14:14 +04:00
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else if (x) return log_8[(x & 0xff) - 1];
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return -1; /* special `log' for 0 */
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}
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}
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2002-06-13 17:39:55 +04:00
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int luaO_rawequalObj (const TObject *t1, const TObject *t2) {
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2000-04-25 20:55:09 +04:00
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if (ttype(t1) != ttype(t2)) return 0;
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2002-10-04 18:31:03 +04:00
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else switch (ttype(t1)) {
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2001-01-26 17:16:35 +03:00
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case LUA_TNIL:
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return 1;
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2003-01-27 16:00:43 +03:00
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case LUA_TNUMBER:
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return nvalue(t1) == nvalue(t2);
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2001-12-12 01:48:44 +03:00
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case LUA_TBOOLEAN:
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2002-05-06 19:51:41 +04:00
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return bvalue(t1) == bvalue(t2); /* boolean true must be 1 !! */
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2002-07-17 20:25:13 +04:00
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case LUA_TLIGHTUSERDATA:
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2002-04-05 22:54:31 +04:00
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return pvalue(t1) == pvalue(t2);
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2003-01-27 16:00:43 +03:00
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default:
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lua_assert(iscollectable(t1));
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return gcvalue(t1) == gcvalue(t2);
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1997-09-16 23:25:59 +04:00
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}
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}
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2001-11-28 23:13:13 +03:00
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int luaO_str2d (const char *s, lua_Number *result) {
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char *endptr;
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2000-12-04 21:33:40 +03:00
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lua_Number res = lua_str2number(s, &endptr);
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2000-10-03 18:03:21 +04:00
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if (endptr == s) return 0; /* no conversion */
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2001-11-28 23:13:13 +03:00
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while (isspace((unsigned char)(*endptr))) endptr++;
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if (*endptr != '\0') return 0; /* invalid trailing characters? */
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2000-10-03 18:03:21 +04:00
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*result = res;
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1999-09-06 17:55:09 +04:00
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return 1;
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1998-12-27 23:25:20 +03:00
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}
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2000-09-12 00:29:27 +04:00
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2000-10-20 20:36:32 +04:00
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2002-05-07 21:36:56 +04:00
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static void pushstr (lua_State *L, const char *str) {
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2002-11-07 18:37:10 +03:00
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setsvalue2s(L->top, luaS_new(L, str));
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2002-05-07 21:36:56 +04:00
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incr_top(L);
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}
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/* this function handles only `%d', `%c', %f, and `%s' formats */
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2002-05-16 22:39:46 +04:00
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const char *luaO_pushvfstring (lua_State *L, const char *fmt, va_list argp) {
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2002-05-15 22:57:44 +04:00
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int n = 1;
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pushstr(L, "");
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2002-05-07 21:36:56 +04:00
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for (;;) {
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const char *e = strchr(fmt, '%');
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if (e == NULL) break;
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2002-11-07 18:37:10 +03:00
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setsvalue2s(L->top, luaS_newlstr(L, fmt, e-fmt));
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2002-05-07 21:36:56 +04:00
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incr_top(L);
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switch (*(e+1)) {
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case 's':
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pushstr(L, va_arg(argp, char *));
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break;
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case 'c': {
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char buff[2];
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2002-08-07 18:35:55 +04:00
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buff[0] = cast(char, va_arg(argp, int));
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2002-05-07 21:36:56 +04:00
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buff[1] = '\0';
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pushstr(L, buff);
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break;
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}
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case 'd':
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setnvalue(L->top, va_arg(argp, int));
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incr_top(L);
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break;
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case 'f':
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2002-10-22 21:18:28 +04:00
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setnvalue(L->top, va_arg(argp, l_uacNumber));
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2002-05-07 21:36:56 +04:00
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incr_top(L);
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break;
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case '%':
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pushstr(L, "%");
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break;
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default: lua_assert(0);
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}
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n += 2;
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fmt = e+2;
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}
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pushstr(L, fmt);
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2002-11-21 18:16:04 +03:00
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luaV_concat(L, n+1, L->top - L->base - 1);
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2002-05-07 21:36:56 +04:00
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L->top -= n;
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return svalue(L->top - 1);
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}
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2002-05-16 22:39:46 +04:00
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const char *luaO_pushfstring (lua_State *L, const char *fmt, ...) {
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2002-05-07 21:36:56 +04:00
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const char *msg;
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va_list argp;
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va_start(argp, fmt);
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2002-05-16 22:39:46 +04:00
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msg = luaO_pushvfstring(L, fmt, argp);
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2002-05-07 21:36:56 +04:00
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va_end(argp);
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return msg;
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}
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2001-11-28 23:13:13 +03:00
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void luaO_chunkid (char *out, const char *source, int bufflen) {
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if (*source == '=') {
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2000-10-20 20:36:32 +04:00
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strncpy(out, source+1, bufflen); /* remove first char */
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2001-11-28 23:13:13 +03:00
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out[bufflen-1] = '\0'; /* ensures null termination */
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2000-10-20 20:36:32 +04:00
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}
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2002-05-15 22:57:44 +04:00
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else { /* out = "source", or "...source" */
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2001-11-28 23:13:13 +03:00
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if (*source == '@') {
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2000-10-09 17:47:32 +04:00
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int l;
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source++; /* skip the `@' */
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2002-05-15 22:57:44 +04:00
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bufflen -= sizeof(" `...' ");
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2000-10-09 17:47:32 +04:00
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l = strlen(source);
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2002-05-15 22:57:44 +04:00
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strcpy(out, "");
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2000-10-09 17:47:32 +04:00
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if (l>bufflen) {
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source += (l-bufflen); /* get last part of file name */
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2002-05-07 21:36:56 +04:00
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strcat(out, "...");
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2000-10-09 17:47:32 +04:00
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}
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2002-05-07 21:36:56 +04:00
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strcat(out, source);
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2000-10-09 17:47:32 +04:00
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}
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2002-05-15 22:57:44 +04:00
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else { /* out = [string "string"] */
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2001-11-28 23:13:13 +03:00
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int len = strcspn(source, "\n"); /* stop at first newline */
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2002-05-15 22:57:44 +04:00
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bufflen -= sizeof(" [string \"...\"] ");
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2000-10-09 17:47:32 +04:00
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if (len > bufflen) len = bufflen;
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2002-05-15 22:57:44 +04:00
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strcpy(out, "[string \"");
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2001-11-28 23:13:13 +03:00
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if (source[len] != '\0') { /* must truncate? */
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2002-05-07 21:36:56 +04:00
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strncat(out, source, len);
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strcat(out, "...");
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2000-10-20 20:36:32 +04:00
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}
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2000-10-09 17:47:32 +04:00
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else
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2002-05-07 21:36:56 +04:00
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strcat(out, source);
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2002-05-15 22:57:44 +04:00
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strcat(out, "\"]");
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2000-09-12 00:29:27 +04:00
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}
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}
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}
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