mirror of
https://github.com/lua/lua
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243 lines
6.4 KiB
C
243 lines
6.4 KiB
C
/*
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** $Id: lobject.c,v 2.43 2010/10/29 15:54:55 roberto Exp roberto $
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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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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define lobject_c
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#define LUA_CORE
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#include "lua.h"
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#include "lctype.h"
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#include "ldebug.h"
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#include "ldo.h"
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#include "lmem.h"
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#include "lobject.h"
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#include "lstate.h"
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#include "lstring.h"
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#include "lvm.h"
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LUAI_DDEF const TValue luaO_nilobject_ = {NILCONSTANT};
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/*
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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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*/
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int luaO_int2fb (lu_int32 x) {
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int e = 0; /* exponent */
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if (x < 8) return x;
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while (x >= 0x10) {
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x = (x+1) >> 1;
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e++;
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}
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return ((e+1) << 3) | (cast_int(x) - 8);
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}
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/* converts back */
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int luaO_fb2int (int x) {
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int e = (x >> 3) & 0x1f;
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if (e == 0) return x;
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else return ((x & 7) + 8) << (e - 1);
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}
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int luaO_ceillog2 (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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};
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int l = 0;
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x--;
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while (x >= 256) { l += 8; x >>= 8; }
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return l + log_2[x];
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}
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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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case LUA_TNIL:
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return 1;
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case LUA_TNUMBER:
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return luai_numeq(nvalue(t1), nvalue(t2));
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case LUA_TBOOLEAN:
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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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case LUA_TSTRING:
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return rawtsvalue(t1) == rawtsvalue(t2);
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case LUA_TLCF:
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return fvalue(t1) == fvalue(t2);
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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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}
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}
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lua_Number luaO_arith (int op, lua_Number v1, lua_Number v2) {
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switch (op) {
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case LUA_OPADD: return luai_numadd(NULL, v1, v2);
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case LUA_OPSUB: return luai_numsub(NULL, v1, v2);
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case LUA_OPMUL: return luai_nummul(NULL, v1, v2);
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case LUA_OPDIV: return luai_numdiv(NULL, v1, v2);
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case LUA_OPMOD: return luai_nummod(NULL, v1, v2);
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case LUA_OPPOW: return luai_numpow(NULL, v1, v2);
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case LUA_OPUNM: return luai_numunm(NULL, v1);
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default: lua_assert(0); return 0;
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}
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}
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static int checkend (const char *s, const char *e, const char *endptr) {
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if (endptr == s) return 0; /* no characters converted */
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while (lisspace(cast(unsigned char, *endptr))) endptr++;
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return (endptr == e); /* OK if no trailing characters */
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}
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int luaO_str2d (const char *s, size_t len, lua_Number *result) {
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char *endptr;
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const char *e = s + len; /* string 's' ends here */
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*result = lua_str2number(s, &endptr);
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if (checkend(s, e, endptr)) return 1; /* conversion OK? */
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*result = cast_num(strtoul(s, &endptr, 0)); /* try hexadecimal */
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return checkend(s, e, endptr);
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}
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static void pushstr (lua_State *L, const char *str, size_t l) {
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setsvalue2s(L, L->top, luaS_newlstr(L, str, l));
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incr_top(L);
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}
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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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int n = 0;
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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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setsvalue2s(L, L->top, luaS_newlstr(L, fmt, e-fmt));
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incr_top(L);
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switch (*(e+1)) {
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case 's': {
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const char *s = va_arg(argp, char *);
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if (s == NULL) s = "(null)";
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pushstr(L, s, strlen(s));
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break;
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}
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case 'c': {
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char buff;
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buff = cast(char, va_arg(argp, int));
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pushstr(L, &buff, 1);
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break;
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}
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case 'd': {
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setnvalue(L->top, cast_num(va_arg(argp, int)));
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incr_top(L);
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break;
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}
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case 'f': {
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setnvalue(L->top, cast_num(va_arg(argp, l_uacNumber)));
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incr_top(L);
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break;
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}
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case 'p': {
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char buff[4*sizeof(void *) + 8]; /* should be enough space for a `%p' */
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int l = sprintf(buff, "%p", va_arg(argp, void *));
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pushstr(L, buff, l);
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break;
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}
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case '%': {
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pushstr(L, "%", 1);
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break;
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}
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default: {
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luaG_runerror(L,
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"invalid option " LUA_QL("%%%c") " to " LUA_QL("lua_pushfstring"),
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*(e + 1));
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break;
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}
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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, strlen(fmt));
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if (n > 0) luaV_concat(L, n + 1);
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return svalue(L->top - 1);
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}
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const char *luaO_pushfstring (lua_State *L, const char *fmt, ...) {
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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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msg = luaO_pushvfstring(L, fmt, argp);
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va_end(argp);
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return msg;
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}
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#define LL(x) (sizeof(x) - 1)
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#define RETS "..."
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#define PRE "[string \""
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#define POS "\"]"
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#define addstr(a,b,l) ( memcpy(a,b,l), a += (l) )
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void luaO_chunkid (char *out, const char *source, size_t bufflen) {
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size_t l = strlen(source);
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if (*source == '=') { /* 'literal' source */
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if (l <= bufflen) /* small enough? */
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memcpy(out, source + 1, l);
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else { /* truncate it */
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addstr(out, source + 1, bufflen - 1);
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*out = '\0';
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}
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}
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else if (*source == '@') { /* file name */
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if (l <= bufflen) /* small enough? */
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memcpy(out, source + 1, l);
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else { /* add '...' before rest of name */
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addstr(out, RETS, LL(RETS));
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bufflen -= LL(RETS);
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memcpy(out, source + 1 + l - bufflen, bufflen);
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}
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}
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else { /* string; format as [string "source"] */
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const char *nl = strchr(source, '\n'); /* find first new line (if any) */
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addstr(out, PRE, LL(PRE)); /* add prefix */
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bufflen -= LL(PRE RETS POS) + 1; /* save space for prefix+suffix+'\0' */
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if (l < bufflen && nl == NULL) { /* small one-line source? */
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addstr(out, source, l); /* keep it */
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}
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else {
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if (nl != NULL) l = nl - source; /* stop at first newline */
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if (l > bufflen) l = bufflen;
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addstr(out, source, l);
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addstr(out, RETS, LL(RETS));
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}
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memcpy(out, POS, LL(POS) + 1);
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}
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}
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