/* ** $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 #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) 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 (r * (1 << 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 = lcompat_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)); } }