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520
Plugins/slua_unreal/External/lua/lobject.cpp
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520
Plugins/slua_unreal/External/lua/lobject.cpp
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/*
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** $Id: lobject.c,v 2.113 2016/12/22 13:08:50 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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*/
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#define lobject_c
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#define LUA_CORE
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#include "lobject.h"
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#include "lprefix.h"
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#include <locale.h>
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#include <math.h>
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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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#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 "lstate.h"
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#include "lstring.h"
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#include "lvm.h"
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namespace NS_SLUA {
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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 (unsigned int x) {
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int e = 0; /* exponent */
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if (x < 8) return x;
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while (x >= (8 << 4)) { /* coarse steps */
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x = (x + 0xf) >> 4; /* x = ceil(x / 16) */
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e += 4;
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}
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while (x >= (8 << 1)) { /* fine steps */
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x = (x + 1) >> 1; /* x = ceil(x / 2) */
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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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return (x < 8) ? x : ((x & 7) + 8) << ((x >> 3) - 1);
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}
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/*
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** Computes ceil(log2(x))
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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] = { /* log_2[i] = ceil(log2(i - 1)) */
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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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static lua_Integer intarith (lua_State *L, int op, lua_Integer v1,
|
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lua_Integer v2) {
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switch (op) {
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case LUA_OPADD: return intop(+, v1, v2);
|
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case LUA_OPSUB:return intop(-, v1, v2);
|
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case LUA_OPMUL:return intop(*, v1, v2);
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case LUA_OPMOD: return luaV_mod(L, v1, v2);
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case LUA_OPIDIV: return luaV_div(L, v1, v2);
|
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case LUA_OPBAND: return intop(&, v1, v2);
|
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case LUA_OPBOR: return intop(|, v1, v2);
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case LUA_OPBXOR: return intop(^, v1, v2);
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case LUA_OPSHL: return luaV_shiftl(v1, v2);
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case LUA_OPSHR: return luaV_shiftl(v1, -v2);
|
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case LUA_OPUNM: return intop(-, 0, v1);
|
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case LUA_OPBNOT: return intop(^, ~l_castS2U(0), v1);
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default: lua_assert(0); return 0;
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}
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}
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static lua_Number numarith (lua_State *L, int op, lua_Number v1,
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lua_Number v2) {
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switch (op) {
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case LUA_OPADD: return luai_numadd(L, v1, v2);
|
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case LUA_OPSUB: return luai_numsub(L, v1, v2);
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case LUA_OPMUL: return luai_nummul(L, v1, v2);
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case LUA_OPDIV: return luai_numdiv(L, v1, v2);
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case LUA_OPPOW: return luai_numpow(L, v1, v2);
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case LUA_OPIDIV: return luai_numidiv(L, v1, v2);
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case LUA_OPUNM: return luai_numunm(L, v1);
|
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case LUA_OPMOD: {
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lua_Number m;
|
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luai_nummod(L, v1, v2, m);
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return m;
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}
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default: lua_assert(0); return 0;
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}
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}
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void luaO_arith (lua_State *L, int op, const TValue *p1, const TValue *p2,
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TValue *res) {
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switch (op) {
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case LUA_OPBAND: case LUA_OPBOR: case LUA_OPBXOR:
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case LUA_OPSHL: case LUA_OPSHR:
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case LUA_OPBNOT: { /* operate only on integers */
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lua_Integer i1; lua_Integer i2;
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if (tointeger(p1, &i1) && tointeger(p2, &i2)) {
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setivalue(res, intarith(L, op, i1, i2));
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return;
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}
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else break; /* go to the end */
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}
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case LUA_OPDIV: case LUA_OPPOW: { /* operate only on floats */
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lua_Number n1; lua_Number n2;
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if (tonumber(p1, &n1) && tonumber(p2, &n2)) {
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setfltvalue(res, numarith(L, op, n1, n2));
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return;
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}
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else break; /* go to the end */
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}
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default: { /* other operations */
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lua_Number n1; lua_Number n2;
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if (ttisinteger(p1) && ttisinteger(p2)) {
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setivalue(res, intarith(L, op, ivalue(p1), ivalue(p2)));
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return;
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}
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else if (tonumber(p1, &n1) && tonumber(p2, &n2)) {
|
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setfltvalue(res, numarith(L, op, n1, n2));
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return;
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}
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else break; /* go to the end */
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}
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}
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/* could not perform raw operation; try metamethod */
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lua_assert(L != NULL); /* should not fail when folding (compile time) */
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luaT_trybinTM(L, p1, p2, res, cast(TMS, (op - LUA_OPADD) + TM_ADD));
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}
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int luaO_hexavalue (int c) {
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if (lisdigit(c)) return c - '0';
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else return (ltolower(c) - 'a') + 10;
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}
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static int isneg (const char **s) {
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if (**s == '-') { (*s)++; return 1; }
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else if (**s == '+') (*s)++;
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return 0;
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}
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/*
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** {==================================================================
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** Lua's implementation for 'lua_strx2number'
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** ===================================================================
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*/
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#if !defined(lua_strx2number)
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/* maximum number of significant digits to read (to avoid overflows
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even with single floats) */
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#define MAXSIGDIG 30
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/*
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** convert an hexadecimal numeric string to a number, following
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** C99 specification for 'strtod'
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*/
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static lua_Number lua_strx2number (const char *s, char **endptr) {
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int dot = lua_getlocaledecpoint();
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lua_Number r = 0.0; /* result (accumulator) */
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int sigdig = 0; /* number of significant digits */
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int nosigdig = 0; /* number of non-significant digits */
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int e = 0; /* exponent correction */
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int neg; /* 1 if number is negative */
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int hasdot = 0; /* true after seen a dot */
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*endptr = cast(char *, s); /* nothing is valid yet */
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while (lisspace(cast_uchar(*s))) s++; /* skip initial spaces */
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neg = isneg(&s); /* check signal */
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if (!(*s == '0' && (*(s + 1) == 'x' || *(s + 1) == 'X'))) /* check '0x' */
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return 0.0; /* invalid format (no '0x') */
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for (s += 2; ; s++) { /* skip '0x' and read numeral */
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if (*s == dot) {
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if (hasdot) break; /* second dot? stop loop */
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else hasdot = 1;
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}
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else if (lisxdigit(cast_uchar(*s))) {
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if (sigdig == 0 && *s == '0') /* non-significant digit (zero)? */
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nosigdig++;
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else if (++sigdig <= MAXSIGDIG) /* can read it without overflow? */
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r = (r * cast_num(16.0)) + luaO_hexavalue(*s);
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else e++; /* too many digits; ignore, but still count for exponent */
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if (hasdot) e--; /* decimal digit? correct exponent */
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}
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else break; /* neither a dot nor a digit */
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}
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if (nosigdig + sigdig == 0) /* no digits? */
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return 0.0; /* invalid format */
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*endptr = cast(char *, s); /* valid up to here */
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e *= 4; /* each digit multiplies/divides value by 2^4 */
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if (*s == 'p' || *s == 'P') { /* exponent part? */
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int exp1 = 0; /* exponent value */
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int neg1; /* exponent signal */
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s++; /* skip 'p' */
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neg1 = isneg(&s); /* signal */
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if (!lisdigit(cast_uchar(*s)))
|
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return 0.0; /* invalid; must have at least one digit */
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while (lisdigit(cast_uchar(*s))) /* read exponent */
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exp1 = exp1 * 10 + *(s++) - '0';
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if (neg1) exp1 = -exp1;
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e += exp1;
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*endptr = cast(char *, s); /* valid up to here */
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}
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if (neg) r = -r;
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return l_mathop(ldexp)(r, e);
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}
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#endif
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/* }====================================================== */
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/* maximum length of a numeral */
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#if !defined (L_MAXLENNUM)
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#define L_MAXLENNUM 200
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#endif
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static const char *l_str2dloc (const char *s, lua_Number *result, int mode) {
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char *endptr;
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*result = (mode == 'x') ? lua_strx2number(s, &endptr) /* try to convert */
|
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: lua_str2number(s, &endptr);
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if (endptr == s) return NULL; /* nothing recognized? */
|
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while (lisspace(cast_uchar(*endptr))) endptr++; /* skip trailing spaces */
|
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return (*endptr == '\0') ? endptr : NULL; /* OK if no trailing characters */
|
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}
|
||||
|
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|
||||
/*
|
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** Convert string 's' to a Lua number (put in 'result'). Return NULL
|
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** on fail or the address of the ending '\0' on success.
|
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** 'pmode' points to (and 'mode' contains) special things in the string:
|
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** - 'x'/'X' means an hexadecimal numeral
|
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** - 'n'/'N' means 'inf' or 'nan' (which should be rejected)
|
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** - '.' just optimizes the search for the common case (nothing special)
|
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** This function accepts both the current locale or a dot as the radix
|
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** mark. If the convertion fails, it may mean number has a dot but
|
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** locale accepts something else. In that case, the code copies 's'
|
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** to a buffer (because 's' is read-only), changes the dot to the
|
||||
** current locale radix mark, and tries to convert again.
|
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*/
|
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static const char *l_str2d (const char *s, lua_Number *result) {
|
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const char *endptr;
|
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const char *pmode = strpbrk(s, ".xXnN");
|
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int mode = pmode ? ltolower(cast_uchar(*pmode)) : 0;
|
||||
if (mode == 'n') /* reject 'inf' and 'nan' */
|
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return NULL;
|
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endptr = l_str2dloc(s, result, mode); /* try to convert */
|
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if (endptr == NULL) { /* failed? may be a different locale */
|
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char buff[L_MAXLENNUM + 1];
|
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const char *pdot = strchr(s, '.');
|
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if (strlen(s) > L_MAXLENNUM || pdot == NULL)
|
||||
return NULL; /* string too long or no dot; fail */
|
||||
strcpy(buff, s); /* copy string to buffer */
|
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buff[pdot - s] = lua_getlocaledecpoint(); /* correct decimal point */
|
||||
endptr = l_str2dloc(buff, result, mode); /* try again */
|
||||
if (endptr != NULL)
|
||||
endptr = s + (endptr - buff); /* make relative to 's' */
|
||||
}
|
||||
return endptr;
|
||||
}
|
||||
|
||||
|
||||
#define MAXBY10 cast(lua_Unsigned, LUA_MAXINTEGER / 10)
|
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#define MAXLASTD cast_int(LUA_MAXINTEGER % 10)
|
||||
|
||||
static const char *l_str2int (const char *s, lua_Integer *result) {
|
||||
lua_Unsigned a = 0;
|
||||
int empty = 1;
|
||||
int neg;
|
||||
while (lisspace(cast_uchar(*s))) s++; /* skip initial spaces */
|
||||
neg = isneg(&s);
|
||||
if (s[0] == '0' &&
|
||||
(s[1] == 'x' || s[1] == 'X')) { /* hex? */
|
||||
s += 2; /* skip '0x' */
|
||||
for (; lisxdigit(cast_uchar(*s)); s++) {
|
||||
a = a * 16 + luaO_hexavalue(*s);
|
||||
empty = 0;
|
||||
}
|
||||
}
|
||||
else { /* decimal */
|
||||
for (; lisdigit(cast_uchar(*s)); s++) {
|
||||
int d = *s - '0';
|
||||
if (a >= MAXBY10 && (a > MAXBY10 || d > MAXLASTD + neg)) /* overflow? */
|
||||
return NULL; /* do not accept it (as integer) */
|
||||
a = a * 10 + d;
|
||||
empty = 0;
|
||||
}
|
||||
}
|
||||
while (lisspace(cast_uchar(*s))) s++; /* skip trailing spaces */
|
||||
if (empty || *s != '\0') return NULL; /* something wrong in the numeral */
|
||||
else {
|
||||
*result = l_castU2S((neg) ? 0u - a : a);
|
||||
return s;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
size_t luaO_str2num (const char *s, TValue *o) {
|
||||
lua_Integer i; lua_Number n;
|
||||
const char *e;
|
||||
if ((e = l_str2int(s, &i)) != NULL) { /* try as an integer */
|
||||
setivalue(o, i);
|
||||
}
|
||||
else if ((e = l_str2d(s, &n)) != NULL) { /* else try as a float */
|
||||
setfltvalue(o, n);
|
||||
}
|
||||
else
|
||||
return 0; /* conversion failed */
|
||||
return (e - s) + 1; /* success; return string size */
|
||||
}
|
||||
|
||||
|
||||
int luaO_utf8esc (char *buff, unsigned long x) {
|
||||
int n = 1; /* number of bytes put in buffer (backwards) */
|
||||
lua_assert(x <= 0x10FFFF);
|
||||
if (x < 0x80) /* ascii? */
|
||||
buff[UTF8BUFFSZ - 1] = cast(char, x);
|
||||
else { /* need continuation bytes */
|
||||
unsigned int mfb = 0x3f; /* maximum that fits in first byte */
|
||||
do { /* add continuation bytes */
|
||||
buff[UTF8BUFFSZ - (n++)] = cast(char, 0x80 | (x & 0x3f));
|
||||
x >>= 6; /* remove added bits */
|
||||
mfb >>= 1; /* now there is one less bit available in first byte */
|
||||
} while (x > mfb); /* still needs continuation byte? */
|
||||
buff[UTF8BUFFSZ - n] = cast(char, (~mfb << 1) | x); /* add first byte */
|
||||
}
|
||||
return n;
|
||||
}
|
||||
|
||||
|
||||
/* maximum length of the conversion of a number to a string */
|
||||
#define MAXNUMBER2STR 50
|
||||
|
||||
|
||||
/*
|
||||
** Convert a number object to a string
|
||||
*/
|
||||
void luaO_tostring (lua_State *L, StkId obj) {
|
||||
char buff[MAXNUMBER2STR];
|
||||
size_t len;
|
||||
lua_assert(ttisnumber(obj));
|
||||
if (ttisinteger(obj))
|
||||
len = lua_integer2str(buff, sizeof(buff), ivalue(obj));
|
||||
else {
|
||||
len = lua_number2str(buff, sizeof(buff), fltvalue(obj));
|
||||
#if !defined(LUA_COMPAT_FLOATSTRING)
|
||||
if (buff[strspn(buff, "-0123456789")] == '\0') { /* looks like an int? */
|
||||
buff[len++] = lua_getlocaledecpoint();
|
||||
buff[len++] = '0'; /* adds '.0' to result */
|
||||
}
|
||||
#endif
|
||||
}
|
||||
setsvalue2s(L, obj, luaS_newlstr(L, buff, len));
|
||||
}
|
||||
|
||||
|
||||
static void pushstr (lua_State *L, const char *str, size_t l) {
|
||||
setsvalue2s(L, L->top, luaS_newlstr(L, str, l));
|
||||
luaD_inctop(L);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
** this function handles only '%d', '%c', '%f', '%p', and '%s'
|
||||
conventional formats, plus Lua-specific '%I' and '%U'
|
||||
*/
|
||||
const char *luaO_pushvfstring (lua_State *L, const char *fmt, va_list argp) {
|
||||
int n = 0;
|
||||
for (;;) {
|
||||
const char *e = strchr(fmt, '%');
|
||||
if (e == NULL) break;
|
||||
pushstr(L, fmt, e - fmt);
|
||||
switch (*(e+1)) {
|
||||
case 's': { /* zero-terminated string */
|
||||
const char *s = va_arg(argp, char *);
|
||||
if (s == NULL) s = "(null)";
|
||||
pushstr(L, s, strlen(s));
|
||||
break;
|
||||
}
|
||||
case 'c': { /* an 'int' as a character */
|
||||
char buff = cast(char, va_arg(argp, int));
|
||||
if (lisprint(cast_uchar(buff)))
|
||||
pushstr(L, &buff, 1);
|
||||
else /* non-printable character; print its code */
|
||||
luaO_pushfstring(L, "<\\%d>", cast_uchar(buff));
|
||||
break;
|
||||
}
|
||||
case 'd': { /* an 'int' */
|
||||
setivalue(L->top, va_arg(argp, int));
|
||||
goto top2str;
|
||||
}
|
||||
case 'I': { /* a 'lua_Integer' */
|
||||
setivalue(L->top, cast(lua_Integer, va_arg(argp, l_uacInt)));
|
||||
goto top2str;
|
||||
}
|
||||
case 'f': { /* a 'lua_Number' */
|
||||
setfltvalue(L->top, cast_num(va_arg(argp, l_uacNumber)));
|
||||
top2str: /* convert the top element to a string */
|
||||
luaD_inctop(L);
|
||||
luaO_tostring(L, L->top - 1);
|
||||
break;
|
||||
}
|
||||
case 'p': { /* a pointer */
|
||||
char buff[4*sizeof(void *) + 8]; /* should be enough space for a '%p' */
|
||||
int l = l_sprintf(buff, sizeof(buff), "%p", va_arg(argp, void *));
|
||||
pushstr(L, buff, l);
|
||||
break;
|
||||
}
|
||||
case 'U': { /* an 'int' as a UTF-8 sequence */
|
||||
char buff[UTF8BUFFSZ];
|
||||
int l = luaO_utf8esc(buff, cast(long, va_arg(argp, long)));
|
||||
pushstr(L, buff + UTF8BUFFSZ - l, l);
|
||||
break;
|
||||
}
|
||||
case '%': {
|
||||
pushstr(L, "%", 1);
|
||||
break;
|
||||
}
|
||||
default: {
|
||||
luaG_runerror(L, "invalid option '%%%c' to 'lua_pushfstring'",
|
||||
*(e + 1));
|
||||
}
|
||||
}
|
||||
n += 2;
|
||||
fmt = e+2;
|
||||
}
|
||||
luaD_checkstack(L, 1);
|
||||
pushstr(L, fmt, strlen(fmt));
|
||||
if (n > 0) luaV_concat(L, n + 1);
|
||||
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;
|
||||
}
|
||||
|
||||
|
||||
/* number of chars of a literal string without the ending \0 */
|
||||
#define LL(x) (sizeof(x)/sizeof(char) - 1)
|
||||
|
||||
#define RETS "..."
|
||||
#define PRE "[string \""
|
||||
#define POS "\"]"
|
||||
|
||||
#define addstr(a,b,l) ( memcpy(a,b,(l) * sizeof(char)), a += (l) )
|
||||
|
||||
void luaO_chunkid (char *out, const char *source, size_t bufflen) {
|
||||
size_t l = strlen(source);
|
||||
if (*source == '=') { /* 'literal' source */
|
||||
if (l <= bufflen) /* small enough? */
|
||||
memcpy(out, source + 1, l * sizeof(char));
|
||||
else { /* truncate it */
|
||||
addstr(out, source + 1, bufflen - 1);
|
||||
*out = '\0';
|
||||
}
|
||||
}
|
||||
else if (*source == '@') { /* file name */
|
||||
if (l <= bufflen) /* small enough? */
|
||||
memcpy(out, source + 1, l * sizeof(char));
|
||||
else { /* add '...' before rest of name */
|
||||
addstr(out, RETS, LL(RETS));
|
||||
bufflen -= LL(RETS);
|
||||
memcpy(out, source + 1 + l - bufflen, bufflen * sizeof(char));
|
||||
}
|
||||
}
|
||||
else { /* string; format as [string "source"] */
|
||||
const char *nl = strchr(source, '\n'); /* find first new line (if any) */
|
||||
addstr(out, PRE, LL(PRE)); /* add prefix */
|
||||
bufflen -= LL(PRE RETS POS) + 1; /* save space for prefix+suffix+'\0' */
|
||||
if (l < bufflen && nl == NULL) { /* small one-line source? */
|
||||
addstr(out, source, l); /* keep it */
|
||||
}
|
||||
else {
|
||||
if (nl != NULL) l = nl - source; /* stop at first newline */
|
||||
if (l > bufflen) l = bufflen;
|
||||
addstr(out, source, l);
|
||||
addstr(out, RETS, LL(RETS));
|
||||
}
|
||||
memcpy(out, POS, (LL(POS) + 1) * sizeof(char));
|
||||
}
|
||||
}
|
||||
|
||||
} // end NS_SLUA
|
||||
Reference in New Issue
Block a user