288 lines
7.7 KiB
C
288 lines
7.7 KiB
C
/*
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** $Id: lobject.c,v 2.58.1.1 2013/04/12 18:48:47 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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#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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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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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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#if !defined(lua_strx2number)
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#include <math.h>
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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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static lua_Number readhexa (const char **s, lua_Number r, int *count) {
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for (; lisxdigit(cast_uchar(**s)); (*s)++) { /* read integer part */
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r = (r * cast_num(16.0)) + cast_num(luaO_hexavalue(cast_uchar(**s)));
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(*count)++;
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}
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return r;
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}
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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;
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int e = 0, i = 0;
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int neg = 0; /* 1 if number is negative */
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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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s += 2; /* skip '0x' */
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r = readhexa(&s, r, &i); /* read integer part */
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if (*s == '.') {
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s++; /* skip dot */
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r = readhexa(&s, r, &e); /* read fractional part */
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}
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if (i == 0 && e == 0)
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return 0.0; /* invalid format (no digit) */
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e *= -4; /* each fractional digit divides value by 2^-4 */
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*endptr = cast(char *, s); /* valid up to here */
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if (*s == 'p' || *s == 'P') { /* exponent part? */
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int exp1 = 0;
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int neg1;
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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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goto ret; /* 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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}
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*endptr = cast(char *, s); /* valid up to here */
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ret:
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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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int luaO_str2d (const char *s, size_t len, 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 0;
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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 == s + len); /* OK if no trailing characters */
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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' 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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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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setnvalue(L->top++, cast_num(va_arg(argp, int)));
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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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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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}
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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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}
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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) * sizeof(char));
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}
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}
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