2 ** $Id: lobject.c,v 2.22.1.1 2007/12/27 13:02:25 roberto Exp $
3 ** Some generic functions over Lua objects
4 ** See Copyright Notice in lua.h
27 const TValue luaO_nilobject_ = {{NULL}, LUA_TNIL};
31 ** converts an integer to a "floating point byte", represented as
32 ** (eeeeexxx), where the real value is (1xxx) * 2^(eeeee - 1) if
33 ** eeeee != 0 and (xxx) otherwise.
35 int luaO_int2fb (unsigned int x) {
36 int e = 0; /* expoent */
42 else return ((e+1) << 3) | (cast_int(x) - 8);
47 int luaO_fb2int (int x) {
48 int e = (x >> 3) & 31;
50 else return ((x & 7)+8) << (e - 1);
54 int luaO_log2 (unsigned int x) {
55 static const lu_byte log_2[256] = {
56 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,
57 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,
58 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,
59 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,
60 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,
61 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,
62 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,
63 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
66 while (x >= 256) { l += 8; x >>= 8; }
72 int luaO_rawequalObj (const TValue *t1, const TValue *t2) {
73 if (ttype(t1) != ttype(t2)) return 0;
74 else switch (ttype(t1)) {
78 return luai_numeq(nvalue(t1), nvalue(t2));
80 return bvalue(t1) == bvalue(t2); /* boolean true must be 1 !! */
81 case LUA_TLIGHTUSERDATA:
82 return pvalue(t1) == pvalue(t2);
84 lua_assert(iscollectable(t1));
85 return gcvalue(t1) == gcvalue(t2);
90 int luaO_str2d (const char *s, lua_Number *result) {
92 *result = lua_str2number(s, &endptr);
93 if (endptr == s) return 0; /* conversion failed */
94 if (*endptr == 'x' || *endptr == 'X') /* maybe an hexadecimal constant? */
95 *result = cast_num(strtoul(s, &endptr, 16));
96 if (*endptr == '\0') return 1; /* most common case */
97 while (isspace(cast(unsigned char, *endptr))) endptr++;
98 if (*endptr != '\0') return 0; /* invalid trailing characters? */
104 static void pushstr (lua_State *L, const char *str) {
105 setsvalue2s(L, L->top, luaS_new(L, str));
110 /* this function handles only `%d', `%c', %f, %p, and `%s' formats */
111 const char *luaO_pushvfstring (lua_State *L, const char *fmt, va_list argp) {
115 const char *e = strchr(fmt, '%');
116 if (e == NULL) break;
117 setsvalue2s(L, L->top, luaS_newlstr(L, fmt, e-fmt));
121 const char *s = va_arg(argp, char *);
122 if (s == NULL) s = "(null)";
128 buff[0] = cast(char, va_arg(argp, int));
134 setnvalue(L->top, cast_num(va_arg(argp, int)));
139 setnvalue(L->top, cast_num(va_arg(argp, l_uacNumber)));
144 char buff[4*sizeof(void *) + 8]; /* should be enough space for a `%p' */
145 sprintf(buff, "%p", va_arg(argp, void *));
166 luaV_concat(L, n+1, cast_int(L->top - L->base) - 1);
168 return svalue(L->top - 1);
172 const char *luaO_pushfstring (lua_State *L, const char *fmt, ...) {
176 msg = luaO_pushvfstring(L, fmt, argp);
182 void luaO_chunkid (char *out, const char *source, size_t bufflen) {
183 if (*source == '=') {
184 strncpy(out, source+1, bufflen); /* remove first char */
185 out[bufflen-1] = '\0'; /* ensures null termination */
187 else { /* out = "source", or "...source" */
188 if (*source == '@') {
190 source++; /* skip the `@' */
191 bufflen -= sizeof(" '...' ");
195 source += (l-bufflen); /* get last part of file name */
200 else { /* out = [string "string"] */
201 size_t len = strcspn(source, "\n\r"); /* stop at first newline */
202 bufflen -= sizeof(" [string \"...\"] ");
203 if (len > bufflen) len = bufflen;
204 strcpy(out, "[string \"");
205 if (source[len] != '\0') { /* must truncate? */
206 strncat(out, source, len);