+++ /dev/null
-/*
-** $Id: lobject.c,v 2.58.1.1 2013/04/12 18:48:47 roberto Exp $
-** Some generic functions over Lua objects
-** See Copyright Notice in lua.h
-*/
-
-#include <stdarg.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#define lobject_c
-#define LUA_CORE
-
-#include "lua.h"
-
-#include "lctype.h"
-#include "ldebug.h"
-#include "ldo.h"
-#include "lmem.h"
-#include "lobject.h"
-#include "lstate.h"
-#include "lstring.h"
-#include "lvm.h"
-
-
-
-LUAI_DDEF const TValue luaO_nilobject_ = {NILCONSTANT};
-
-
-/*
-** converts an integer to a "floating point byte", represented as
-** (eeeeexxx), where the real value is (1xxx) * 2^(eeeee - 1) if
-** eeeee != 0 and (xxx) otherwise.
-*/
-int luaO_int2fb (unsigned int x) {
- int e = 0; /* exponent */
- if (x < 8) return x;
- while (x >= 0x10) {
- x = (x+1) >> 1;
- e++;
- }
- return ((e+1) << 3) | (cast_int(x) - 8);
-}
-
-
-/* converts back */
-int luaO_fb2int (int x) {
- int e = (x >> 3) & 0x1f;
- if (e == 0) return x;
- else return ((x & 7) + 8) << (e - 1);
-}
-
-
-int luaO_ceillog2 (unsigned int x) {
- static const lu_byte log_2[256] = {
- 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,
- 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,
- 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,
- 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,
- 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,
- 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,
- 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,
- 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
- };
- int l = 0;
- x--;
- while (x >= 256) { l += 8; x >>= 8; }
- return l + log_2[x];
-}
-
-
-lua_Number luaO_arith (int op, lua_Number v1, lua_Number v2) {
- switch (op) {
- case LUA_OPADD: return luai_numadd(NULL, v1, v2);
- case LUA_OPSUB: return luai_numsub(NULL, v1, v2);
- case LUA_OPMUL: return luai_nummul(NULL, v1, v2);
- case LUA_OPDIV: return luai_numdiv(NULL, v1, v2);
- case LUA_OPMOD: return luai_nummod(NULL, v1, v2);
- case LUA_OPPOW: return luai_numpow(NULL, v1, v2);
- case LUA_OPUNM: return luai_numunm(NULL, v1);
- default: lua_assert(0); return 0;
- }
-}
-
-
-int luaO_hexavalue (int c) {
- if (lisdigit(c)) return c - '0';
- else return ltolower(c) - 'a' + 10;
-}
-
-
-#if !defined(lua_strx2number)
-
-#include <math.h>
-
-
-static int isneg (const char **s) {
- if (**s == '-') { (*s)++; return 1; }
- else if (**s == '+') (*s)++;
- return 0;
-}
-
-
-static lua_Number readhexa (const char **s, lua_Number r, int *count) {
- for (; lisxdigit(cast_uchar(**s)); (*s)++) { /* read integer part */
- r = (r * cast_num(16.0)) + cast_num(luaO_hexavalue(cast_uchar(**s)));
- (*count)++;
- }
- return r;
-}
-
-
-/*
-** convert an hexadecimal numeric string to a number, following
-** C99 specification for 'strtod'
-*/
-static lua_Number lua_strx2number (const char *s, char **endptr) {
- lua_Number r = 0.0;
- int e = 0, i = 0;
- int neg = 0; /* 1 if number is negative */
- *endptr = cast(char *, s); /* nothing is valid yet */
- while (lisspace(cast_uchar(*s))) s++; /* skip initial spaces */
- neg = isneg(&s); /* check signal */
- if (!(*s == '0' && (*(s + 1) == 'x' || *(s + 1) == 'X'))) /* check '0x' */
- return 0.0; /* invalid format (no '0x') */
- s += 2; /* skip '0x' */
- r = readhexa(&s, r, &i); /* read integer part */
- if (*s == '.') {
- s++; /* skip dot */
- r = readhexa(&s, r, &e); /* read fractional part */
- }
- if (i == 0 && e == 0)
- return 0.0; /* invalid format (no digit) */
- e *= -4; /* each fractional digit divides value by 2^-4 */
- *endptr = cast(char *, s); /* valid up to here */
- if (*s == 'p' || *s == 'P') { /* exponent part? */
- int exp1 = 0;
- int neg1;
- s++; /* skip 'p' */
- neg1 = isneg(&s); /* signal */
- if (!lisdigit(cast_uchar(*s)))
- goto ret; /* must have at least one digit */
- while (lisdigit(cast_uchar(*s))) /* read exponent */
- exp1 = exp1 * 10 + *(s++) - '0';
- if (neg1) exp1 = -exp1;
- e += exp1;
- }
- *endptr = cast(char *, s); /* valid up to here */
- ret:
- if (neg) r = -r;
- return l_mathop(ldexp)(r, e);
-}
-
-#endif
-
-
-int luaO_str2d (const char *s, size_t len, lua_Number *result) {
- char *endptr;
- if (strpbrk(s, "nN")) /* reject 'inf' and 'nan' */
- return 0;
- else if (strpbrk(s, "xX")) /* hexa? */
- *result = lua_strx2number(s, &endptr);
- else
- *result = lua_str2number(s, &endptr);
- if (endptr == s) return 0; /* nothing recognized */
- while (lisspace(cast_uchar(*endptr))) endptr++;
- return (endptr == s + len); /* OK if no trailing characters */
-}
-
-
-
-static void pushstr (lua_State *L, const char *str, size_t l) {
- setsvalue2s(L, L->top++, luaS_newlstr(L, str, l));
-}
-
-
-/* this function handles only `%d', `%c', %f, %p, and `%s' formats */
-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;
- luaD_checkstack(L, 2); /* fmt + item */
- pushstr(L, fmt, e - fmt);
- switch (*(e+1)) {
- case 's': {
- const char *s = va_arg(argp, char *);
- if (s == NULL) s = "(null)";
- pushstr(L, s, strlen(s));
- break;
- }
- case 'c': {
- char buff;
- buff = cast(char, va_arg(argp, int));
- pushstr(L, &buff, 1);
- break;
- }
- case 'd': {
- setnvalue(L->top++, cast_num(va_arg(argp, int)));
- break;
- }
- case 'f': {
- setnvalue(L->top++, cast_num(va_arg(argp, l_uacNumber)));
- break;
- }
- case 'p': {
- char buff[4*sizeof(void *) + 8]; /* should be enough space for a `%p' */
- int l = sprintf(buff, "%p", va_arg(argp, void *));
- pushstr(L, buff, l);
- break;
- }
- case '%': {
- pushstr(L, "%", 1);
- break;
- }
- default: {
- luaG_runerror(L,
- "invalid option " LUA_QL("%%%c") " to " LUA_QL("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));
- }
-}
-
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