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** $Id: lobject.c,v 2.22.1.1 2007/12/27 13:02:25 roberto Exp $
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** Some generic functions over Lua objects
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** See Copyright Notice in lua.h
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const TValue luaO_nilobject_ = {{NULL}, LUA_TNIL};
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** converts an integer to a "floating point byte", represented as
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** (eeeeexxx), where the real value is (1xxx) * 2^(eeeee - 1) if
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** eeeee != 0 and (xxx) otherwise.
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int luaO_int2fb (unsigned int x) {
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int e = 0; /* expoent */
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else return ((e+1) << 3) | (cast_int(x) - 8);
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int luaO_fb2int (int x) {
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int e = (x >> 3) & 31;
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else return ((x & 7)+8) << (e - 1);
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int luaO_log2 (unsigned int x) {
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static const lu_byte log_2[256] = {
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0,1,2,2,3,3,3,3,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
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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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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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8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
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8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
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8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
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8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8
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while (x >= 256) { l += 8; x >>= 8; }
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int luaO_rawequalObj (const TValue *t1, const TValue *t2) {
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if (ttype(t1) != ttype(t2)) return 0;
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else switch (ttype(t1)) {
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return luai_numeq(nvalue(t1), nvalue(t2));
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return bvalue(t1) == bvalue(t2); /* boolean true must be 1 !! */
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case LUA_TLIGHTUSERDATA:
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return pvalue(t1) == pvalue(t2);
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lua_assert(iscollectable(t1));
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return gcvalue(t1) == gcvalue(t2);
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int luaO_str2d (const char *s, lua_Number *result) {
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*result = lua_str2number(s, &endptr);
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if (endptr == s) return 0; /* conversion failed */
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if (*endptr == 'x' || *endptr == 'X') /* maybe an hexadecimal constant? */
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*result = cast_num(strtoul(s, &endptr, 16));
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if (*endptr == '\0') return 1; /* most common case */
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while (isspace(cast(unsigned char, *endptr))) endptr++;
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if (*endptr != '\0') return 0; /* invalid trailing characters? */
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static void pushstr (lua_State *L, const char *str) {
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setsvalue2s(L, L->top, luaS_new(L, str));
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/* this function handles only `%d', `%c', %f, %p, and `%s' formats */
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const char *luaO_pushvfstring (lua_State *L, const char *fmt, va_list argp) {
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const char *e = strchr(fmt, '%');
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if (e == NULL) break;
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setsvalue2s(L, L->top, luaS_newlstr(L, fmt, e-fmt));
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const char *s = va_arg(argp, char *);
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if (s == NULL) s = "(null)";
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buff[0] = cast(char, va_arg(argp, int));
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setnvalue(L->top, cast_num(va_arg(argp, int)));
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setnvalue(L->top, cast_num(va_arg(argp, l_uacNumber)));
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char buff[4*sizeof(void *) + 8]; /* should be enough space for a `%p' */
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sprintf(buff, "%p", va_arg(argp, void *));
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luaV_concat(L, n+1, cast_int(L->top - L->base) - 1);
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return svalue(L->top - 1);
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const char *luaO_pushfstring (lua_State *L, const char *fmt, ...) {
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msg = luaO_pushvfstring(L, fmt, argp);
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void luaO_chunkid (char *out, const char *source, size_t bufflen) {
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if (*source == '=') {
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strncpy(out, source+1, bufflen); /* remove first char */
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out[bufflen-1] = '\0'; /* ensures null termination */
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else { /* out = "source", or "...source" */
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if (*source == '@') {
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source++; /* skip the `@' */
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bufflen -= sizeof(" '...' ");
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source += (l-bufflen); /* get last part of file name */
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else { /* out = [string "string"] */
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size_t len = strcspn(source, "\n\r"); /* stop at first newline */
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bufflen -= sizeof(" [string \"...\"] ");
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if (len > bufflen) len = bufflen;
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strcpy(out, "[string \"");
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if (source[len] != '\0') { /* must truncate? */
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strncat(out, source, len);