mirror of
https://github.com/lua/lua
synced 2024-11-22 21:01:26 +03:00
458 lines
14 KiB
C
458 lines
14 KiB
C
/*
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** $Id: lobject.c,v 2.83 2014/04/30 16:48:44 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 (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 >= 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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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_OPPOW: return luaV_pow(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_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_OPIDIV: case LUA_OPBAND: case LUA_OPBOR:
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case LUA_OPBXOR: case LUA_OPSHL: case LUA_OPSHR:
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case LUA_OPBNOT: { /* operates 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: { /* operates 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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(op != LUA_OPPOW || ivalue(p2) >= 0)) {
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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_strx2number converts an hexadecimal numeric string to a number.
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** In C99, 'strtod' does both conversions. C89, however, has no function
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** to convert floating hexadecimal strings to numbers. For these
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** systems, you can leave 'lua_strx2number' undefined and Lua will
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** provide its own implementation.
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** =======================================================
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*/
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#if !defined(lua_strx2number) /* { */
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#if defined(LUA_USE_C99) /* { */
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#define lua_strx2number(s,p) lua_str2number(s,p)
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#else /* }{ */
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/* Lua's implementation for 'lua_strx2number' */
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#include <math.h>
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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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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 = 0; /* 1 if number is negative */
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int dot = 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 == '.') {
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if (dot) break; /* second dot? stop loop */
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else dot = 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 zero? */
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nosigdig++;
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if (dot) e--; /* zero after dot? correct exponent */
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}
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else {
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if (++sigdig <= MAXSIGDIG) { /* can read it without overflow? */
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r = (r * cast_num(16.0)) + luaO_hexavalue(cast_uchar(*s));
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if (dot) e--; /* decimal digit */
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}
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else /* too many digits; ignore */
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if (!dot) e++; /* still count it for exponent */
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}
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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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#endif /* } */
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/* }====================================================== */
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static const char *l_str2d (const char *s, lua_Number *result) {
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char *endptr;
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if (strpbrk(s, "nN")) /* reject 'inf' and 'nan' */
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return NULL;
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else if (strpbrk(s, "xX")) /* hexa? */
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*result = lua_strx2number(s, &endptr);
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else
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*result = lua_str2number(s, &endptr);
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if (endptr == s) return 0; /* nothing recognized */
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while (lisspace(cast_uchar(*endptr))) endptr++;
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return (*endptr == '\0' ? endptr : NULL); /* OK if no trailing characters */
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}
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static const char *l_str2int (const char *s, lua_Integer *result) {
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lua_Unsigned a = 0;
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int empty = 1;
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int neg;
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while (lisspace(cast_uchar(*s))) s++; /* skip initial spaces */
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neg = isneg(&s);
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if (s[0] == '0' &&
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(s[1] == 'x' || s[1] == 'X')) { /* hexa? */
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s += 2; /* skip '0x' */
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for (; lisxdigit(cast_uchar(*s)); s++) {
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a = a * 16 + luaO_hexavalue(cast_uchar(*s));
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empty = 0;
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}
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}
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else { /* decimal */
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for (; lisdigit(cast_uchar(*s)); s++) {
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a = a * 10 + luaO_hexavalue(cast_uchar(*s));
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empty = 0;
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}
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}
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while (lisspace(cast_uchar(*s))) s++; /* skip trailing spaces */
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if (empty || *s != '\0') return NULL; /* something wrong in the numeral */
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else {
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*result = l_castU2S((neg) ? 0u - a : a);
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return s;
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}
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}
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size_t luaO_str2num (const char *s, TValue *o) {
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lua_Integer i; lua_Number n;
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const char *e;
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if ((e = l_str2int(s, &i)) != NULL) { /* try as an integer */
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setivalue(o, i);
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}
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else if ((e = l_str2d(s, &n)) != NULL) { /* else try as a float */
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setfltvalue(o, n);
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}
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else
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return 0; /* conversion failed */
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return (e - s + 1); /* success; return string size */
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}
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int luaO_utf8esc (char *buff, unsigned int x) {
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int n = 1; /* number of bytes put in buffer (backwards) */
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if (x < 0x80) /* ascii? */
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buff[UTF8BUFFSZ - 1] = x;
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else { /* need continuation bytes */
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unsigned int mfb = 0x3f; /* maximum that fits in first byte */
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do {
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buff[UTF8BUFFSZ - (n++)] = 0x80 | (x & 0x3f); /* add continuation byte */
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x >>= 6; /* remove added bits */
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mfb >>= 1; /* now there is one less bit available in first byte */
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} while (x > mfb); /* still needs continuation byte? */
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buff[UTF8BUFFSZ - n] = (~mfb << 1) | x; /* add first byte */
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}
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return n;
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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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}
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/* this function handles only '%d', '%c', '%f', '%p', and '%s'
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conventional formats, plus Lua-specific '%L' and '%U' */
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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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luaD_checkstack(L, 2); /* fmt + item */
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pushstr(L, fmt, e - fmt);
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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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setivalue(L->top++, cast_int(va_arg(argp, int)));
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break;
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}
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case 'I': {
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setivalue(L->top++, cast(lua_Integer, va_arg(argp, l_uacInt)));
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break;
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}
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case 'f': {
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setfltvalue(L->top++, cast_num(va_arg(argp, l_uacNumber)));
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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 'U': {
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char buff[UTF8BUFFSZ];
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int l = luaO_utf8esc(buff, va_arg(argp, int));
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pushstr(L, buff + UTF8BUFFSZ - l, 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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}
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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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luaD_checkstack(L, 1);
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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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/* number of chars of a literal string without the ending \0 */
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#define LL(x) (sizeof(x)/sizeof(char) - 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) * sizeof(char)), 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 * sizeof(char));
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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 * sizeof(char));
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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 * sizeof(char));
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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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}
|
|
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));
|
|
}
|
|
}
|
|
|