1 /* BEGIN CSTYLED */ 2 /* 3 ** $Id: lobject.c,v 2.58.1.1 2013/04/12 18:48:47 roberto Exp $ 4 ** Some generic functions over Lua objects 5 ** See Copyright Notice in lua.h 6 */ 7 8 #define lobject_c 9 #define LUA_CORE 10 11 #include <sys/lua/lua.h> 12 13 #include "lctype.h" 14 #include "ldebug.h" 15 #include "ldo.h" 16 #include "lmem.h" 17 #include "lobject.h" 18 #include "lstate.h" 19 #include "lstring.h" 20 #include "lvm.h" 21 22 23 24 LUAI_DDEF const TValue luaO_nilobject_ = {NILCONSTANT}; 25 26 27 /* 28 ** converts an integer to a "floating point byte", represented as 29 ** (eeeeexxx), where the real value is (1xxx) * 2^(eeeee - 1) if 30 ** eeeee != 0 and (xxx) otherwise. 31 */ 32 int luaO_int2fb (unsigned int x) { 33 int e = 0; /* exponent */ 34 if (x < 8) return x; 35 while (x >= 0x10) { 36 x = (x+1) >> 1; 37 e++; 38 } 39 return ((e+1) << 3) | (cast_int(x) - 8); 40 } 41 42 43 /* converts back */ 44 int luaO_fb2int (int x) { 45 int e = (x >> 3) & 0x1f; 46 if (e == 0) return x; 47 else return ((x & 7) + 8) << (e - 1); 48 } 49 50 51 int luaO_ceillog2 (unsigned int x) { 52 static const lu_byte log_2[256] = { 53 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, 54 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, 55 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, 56 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, 57 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 58 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 59 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 60 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8 61 }; 62 int l = 0; 63 x--; 64 while (x >= 256) { l += 8; x >>= 8; } 65 return l + log_2[x]; 66 } 67 68 69 lua_Number luaO_arith (int op, lua_Number v1, lua_Number v2) { 70 switch (op) { 71 case LUA_OPADD: return luai_numadd(NULL, v1, v2); 72 case LUA_OPSUB: return luai_numsub(NULL, v1, v2); 73 case LUA_OPMUL: return luai_nummul(NULL, v1, v2); 74 case LUA_OPDIV: return luai_numdiv(NULL, v1, v2); 75 case LUA_OPMOD: return luai_nummod(NULL, v1, v2); 76 case LUA_OPPOW: return luai_numpow(NULL, v1, v2); 77 case LUA_OPUNM: return luai_numunm(NULL, v1); 78 default: lua_assert(0); return 0; 79 } 80 } 81 82 83 int luaO_hexavalue (int c) { 84 if (lisdigit(c)) return c - '0'; 85 else return ltolower(c) - 'a' + 10; 86 } 87 88 89 #if !defined(lua_strx2number) 90 91 92 93 static int isneg (const char **s) { 94 if (**s == '-') { (*s)++; return 1; } 95 else if (**s == '+') (*s)++; 96 return 0; 97 } 98 99 100 static lua_Number readhexa (const char **s, lua_Number r, int *count) { 101 for (; lisxdigit(cast_uchar(**s)); (*s)++) { /* read integer part */ 102 r = (r * cast_num(16.0)) + cast_num(luaO_hexavalue(cast_uchar(**s))); 103 (*count)++; 104 } 105 return r; 106 } 107 108 109 /* 110 ** convert an hexadecimal numeric string to a number, following 111 ** C99 specification for 'strtod' 112 */ 113 static lua_Number lua_strx2number (const char *s, char **endptr) { 114 lua_Number r = 0.0; 115 int e = 0, i = 0; 116 int neg = 0; /* 1 if number is negative */ 117 *endptr = cast(char *, s); /* nothing is valid yet */ 118 while (lisspace(cast_uchar(*s))) s++; /* skip initial spaces */ 119 neg = isneg(&s); /* check signal */ 120 if (!(*s == '0' && (*(s + 1) == 'x' || *(s + 1) == 'X'))) /* check '0x' */ 121 return 0.0; /* invalid format (no '0x') */ 122 s += 2; /* skip '0x' */ 123 r = readhexa(&s, r, &i); /* read integer part */ 124 if (*s == '.') { 125 s++; /* skip dot */ 126 r = readhexa(&s, r, &e); /* read fractional part */ 127 } 128 if (i == 0 && e == 0) 129 return 0.0; /* invalid format (no digit) */ 130 e *= -4; /* each fractional digit divides value by 2^-4 */ 131 *endptr = cast(char *, s); /* valid up to here */ 132 if (*s == 'p' || *s == 'P') { /* exponent part? */ 133 int exp1 = 0; 134 int neg1; 135 s++; /* skip 'p' */ 136 neg1 = isneg(&s); /* signal */ 137 if (!lisdigit(cast_uchar(*s))) 138 goto ret; /* must have at least one digit */ 139 while (lisdigit(cast_uchar(*s))) /* read exponent */ 140 exp1 = exp1 * 10 + *(s++) - '0'; 141 if (neg1) exp1 = -exp1; 142 e += exp1; 143 } 144 *endptr = cast(char *, s); /* valid up to here */ 145 ret: 146 if (neg) r = -r; 147 return (r * (1 << e)); 148 } 149 150 #endif 151 152 153 int luaO_str2d (const char *s, size_t len, lua_Number *result) { 154 char *endptr; 155 if (strpbrk(s, "nN")) /* reject 'inf' and 'nan' */ 156 return 0; 157 else if (strpbrk(s, "xX")) /* hexa? */ 158 *result = lua_strx2number(s, &endptr); 159 else 160 *result = lua_str2number(s, &endptr); 161 if (endptr == s) return 0; /* nothing recognized */ 162 while (lisspace(cast_uchar(*endptr))) endptr++; 163 return (endptr == s + len); /* OK if no trailing characters */ 164 } 165 166 167 168 static void pushstr (lua_State *L, const char *str, size_t l) { 169 setsvalue2s(L, L->top++, luaS_newlstr(L, str, l)); 170 } 171 172 173 /* this function handles only `%d', `%c', %f, %p, and `%s' formats */ 174 const char *luaO_pushvfstring (lua_State *L, const char *fmt, va_list argp) { 175 int n = 0; 176 for (;;) { 177 const char *e = strchr(fmt, '%'); 178 if (e == NULL) break; 179 luaD_checkstack(L, 2); /* fmt + item */ 180 pushstr(L, fmt, e - fmt); 181 switch (*(e+1)) { 182 case 's': { 183 const char *s = va_arg(argp, char *); 184 if (s == NULL) s = "(null)"; 185 pushstr(L, s, strlen(s)); 186 break; 187 } 188 case 'c': { 189 char buff; 190 buff = cast(char, va_arg(argp, int)); 191 pushstr(L, &buff, 1); 192 break; 193 } 194 case 'd': { 195 setnvalue(L->top++, cast_num(va_arg(argp, int))); 196 break; 197 } 198 case 'f': { 199 setnvalue(L->top++, cast_num(va_arg(argp, l_uacNumber))); 200 break; 201 } 202 case 'p': { 203 char buff[4*sizeof(void *) + 8]; /* should be enough space for a `%p' */ 204 int l = lcompat_sprintf(buff, sizeof(buff), "%p", va_arg(argp, void *)); 205 pushstr(L, buff, l); 206 break; 207 } 208 case '%': { 209 pushstr(L, "%", 1); 210 break; 211 } 212 default: { 213 luaG_runerror(L, 214 "invalid option " LUA_QL("%%%c") " to " LUA_QL("lua_pushfstring"), 215 *(e + 1)); 216 } 217 } 218 n += 2; 219 fmt = e+2; 220 } 221 luaD_checkstack(L, 1); 222 pushstr(L, fmt, strlen(fmt)); 223 if (n > 0) luaV_concat(L, n + 1); 224 return svalue(L->top - 1); 225 } 226 227 228 const char *luaO_pushfstring (lua_State *L, const char *fmt, ...) { 229 const char *msg; 230 va_list argp; 231 va_start(argp, fmt); 232 msg = luaO_pushvfstring(L, fmt, argp); 233 va_end(argp); 234 return msg; 235 } 236 237 238 /* number of chars of a literal string without the ending \0 */ 239 #define LL(x) (sizeof(x)/sizeof(char) - 1) 240 241 #define RETS "..." 242 #define PRE "[string \"" 243 #define POS "\"]" 244 245 #define addstr(a,b,l) ( memcpy(a,b,(l) * sizeof(char)), a += (l) ) 246 247 void luaO_chunkid (char *out, const char *source, size_t bufflen) { 248 size_t l = strlen(source); 249 if (*source == '=') { /* 'literal' source */ 250 if (l <= bufflen) /* small enough? */ 251 memcpy(out, source + 1, l * sizeof(char)); 252 else { /* truncate it */ 253 addstr(out, source + 1, bufflen - 1); 254 *out = '\0'; 255 } 256 } 257 else if (*source == '@') { /* file name */ 258 if (l <= bufflen) /* small enough? */ 259 memcpy(out, source + 1, l * sizeof(char)); 260 else { /* add '...' before rest of name */ 261 addstr(out, RETS, LL(RETS)); 262 bufflen -= LL(RETS); 263 memcpy(out, source + 1 + l - bufflen, bufflen * sizeof(char)); 264 } 265 } 266 else { /* string; format as [string "source"] */ 267 const char *nl = strchr(source, '\n'); /* find first new line (if any) */ 268 addstr(out, PRE, LL(PRE)); /* add prefix */ 269 bufflen -= LL(PRE RETS POS) + 1; /* save space for prefix+suffix+'\0' */ 270 if (l < bufflen && nl == NULL) { /* small one-line source? */ 271 addstr(out, source, l); /* keep it */ 272 } 273 else { 274 if (nl != NULL) l = nl - source; /* stop at first newline */ 275 if (l > bufflen) l = bufflen; 276 addstr(out, source, l); 277 addstr(out, RETS, LL(RETS)); 278 } 279 memcpy(out, POS, (LL(POS) + 1) * sizeof(char)); 280 } 281 } 282 /* END CSTYLED */ 283