The Battle for Wesnoth  1.17.0-dev
lobject.cpp
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1 /*
2 ** $Id: lobject.c $
3 ** Some generic functions over Lua objects
4 ** See Copyright Notice in lua.h
5 */
6 
7 #define lobject_c
8 #define LUA_CORE
9 
10 #include "lprefix.h"
11 
12 
13 #include <locale.h>
14 #include <math.h>
15 #include <stdarg.h>
16 #include <stdio.h>
17 #include <stdlib.h>
18 #include <string.h>
19 
20 #include "lua.h"
21 
22 #include "lctype.h"
23 #include "ldebug.h"
24 #include "ldo.h"
25 #include "lmem.h"
26 #include "lobject.h"
27 #include "lstate.h"
28 #include "lstring.h"
29 #include "lvm.h"
30 
31 
32 /*
33 ** Computes ceil(log2(x))
34 */
35 int luaO_ceillog2 (unsigned int x) {
36  static const lu_byte log_2[256] = { /* log_2[i] = ceil(log2(i - 1)) */
37  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,
38  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,
39  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,
40  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,
41  8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
42  8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
43  8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
44  8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8
45  };
46  int l = 0;
47  x--;
48  while (x >= 256) { l += 8; x >>= 8; }
49  return l + log_2[x];
50 }
51 
52 
53 static lua_Integer intarith (lua_State *L, int op, lua_Integer v1,
54  lua_Integer v2) {
55  switch (op) {
56  case LUA_OPADD: return intop(+, v1, v2);
57  case LUA_OPSUB:return intop(-, v1, v2);
58  case LUA_OPMUL:return intop(*, v1, v2);
59  case LUA_OPMOD: return luaV_mod(L, v1, v2);
60  case LUA_OPIDIV: return luaV_idiv(L, v1, v2);
61  case LUA_OPBAND: return intop(&, v1, v2);
62  case LUA_OPBOR: return intop(|, v1, v2);
63  case LUA_OPBXOR: return intop(^, v1, v2);
64  case LUA_OPSHL: return luaV_shiftl(v1, v2);
65  case LUA_OPSHR: return luaV_shiftl(v1, -v2);
66  case LUA_OPUNM: return intop(-, 0, v1);
67  case LUA_OPBNOT: return intop(^, ~l_castS2U(0), v1);
68  default: lua_assert(0); return 0;
69  }
70 }
71 
72 
73 static lua_Number numarith (lua_State *L, int op, lua_Number v1,
74  lua_Number v2) {
75  switch (op) {
76  case LUA_OPADD: return luai_numadd(L, v1, v2);
77  case LUA_OPSUB: return luai_numsub(L, v1, v2);
78  case LUA_OPMUL: return luai_nummul(L, v1, v2);
79  case LUA_OPDIV: return luai_numdiv(L, v1, v2);
80  case LUA_OPPOW: return luai_numpow(L, v1, v2);
81  case LUA_OPIDIV: return luai_numidiv(L, v1, v2);
82  case LUA_OPUNM: return luai_numunm(L, v1);
83  case LUA_OPMOD: return luaV_modf(L, v1, v2);
84  default: lua_assert(0); return 0;
85  }
86 }
87 
88 
89 int luaO_rawarith (lua_State *L, int op, const TValue *p1, const TValue *p2,
90  TValue *res) {
91  switch (op) {
92  case LUA_OPBAND: case LUA_OPBOR: case LUA_OPBXOR:
93  case LUA_OPSHL: case LUA_OPSHR:
94  case LUA_OPBNOT: { /* operate only on integers */
95  lua_Integer i1; lua_Integer i2;
96  if (tointegerns(p1, &i1) && tointegerns(p2, &i2)) {
97  setivalue(res, intarith(L, op, i1, i2));
98  return 1;
99  }
100  else return 0; /* fail */
101  }
102  case LUA_OPDIV: case LUA_OPPOW: { /* operate only on floats */
103  lua_Number n1; lua_Number n2;
104  if (tonumberns(p1, n1) && tonumberns(p2, n2)) {
105  setfltvalue(res, numarith(L, op, n1, n2));
106  return 1;
107  }
108  else return 0; /* fail */
109  }
110  default: { /* other operations */
111  lua_Number n1; lua_Number n2;
112  if (ttisinteger(p1) && ttisinteger(p2)) {
113  setivalue(res, intarith(L, op, ivalue(p1), ivalue(p2)));
114  return 1;
115  }
116  else if (tonumberns(p1, n1) && tonumberns(p2, n2)) {
117  setfltvalue(res, numarith(L, op, n1, n2));
118  return 1;
119  }
120  else return 0; /* fail */
121  }
122  }
123 }
124 
125 
126 void luaO_arith (lua_State *L, int op, const TValue *p1, const TValue *p2,
127  StkId res) {
128  if (!luaO_rawarith(L, op, p1, p2, s2v(res))) {
129  /* could not perform raw operation; try metamethod */
130  luaT_trybinTM(L, p1, p2, res, cast(TMS, (op - LUA_OPADD) + TM_ADD));
131  }
132 }
133 
134 
135 int luaO_hexavalue (int c) {
136  if (lisdigit(c)) return c - '0';
137  else return (ltolower(c) - 'a') + 10;
138 }
139 
140 
141 static int isneg (const char **s) {
142  if (**s == '-') { (*s)++; return 1; }
143  else if (**s == '+') (*s)++;
144  return 0;
145 }
146 
147 
148 
149 /*
150 ** {==================================================================
151 ** Lua's implementation for 'lua_strx2number'
152 ** ===================================================================
153 */
154 
155 #if !defined(lua_strx2number)
156 
157 /* maximum number of significant digits to read (to avoid overflows
158  even with single floats) */
159 #define MAXSIGDIG 30
160 
161 /*
162 ** convert a hexadecimal numeric string to a number, following
163 ** C99 specification for 'strtod'
164 */
165 static lua_Number lua_strx2number (const char *s, char **endptr) {
166  int dot = lua_getlocaledecpoint();
167  lua_Number r = 0.0; /* result (accumulator) */
168  int sigdig = 0; /* number of significant digits */
169  int nosigdig = 0; /* number of non-significant digits */
170  int e = 0; /* exponent correction */
171  int neg; /* 1 if number is negative */
172  int hasdot = 0; /* true after seen a dot */
173  *endptr = cast_charp(s); /* nothing is valid yet */
174  while (lisspace(cast_uchar(*s))) s++; /* skip initial spaces */
175  neg = isneg(&s); /* check sign */
176  if (!(*s == '0' && (*(s + 1) == 'x' || *(s + 1) == 'X'))) /* check '0x' */
177  return 0.0; /* invalid format (no '0x') */
178  for (s += 2; ; s++) { /* skip '0x' and read numeral */
179  if (*s == dot) {
180  if (hasdot) break; /* second dot? stop loop */
181  else hasdot = 1;
182  }
183  else if (lisxdigit(cast_uchar(*s))) {
184  if (sigdig == 0 && *s == '0') /* non-significant digit (zero)? */
185  nosigdig++;
186  else if (++sigdig <= MAXSIGDIG) /* can read it without overflow? */
187  r = (r * cast_num(16.0)) + luaO_hexavalue(*s);
188  else e++; /* too many digits; ignore, but still count for exponent */
189  if (hasdot) e--; /* decimal digit? correct exponent */
190  }
191  else break; /* neither a dot nor a digit */
192  }
193  if (nosigdig + sigdig == 0) /* no digits? */
194  return 0.0; /* invalid format */
195  *endptr = cast_charp(s); /* valid up to here */
196  e *= 4; /* each digit multiplies/divides value by 2^4 */
197  if (*s == 'p' || *s == 'P') { /* exponent part? */
198  int exp1 = 0; /* exponent value */
199  int neg1; /* exponent sign */
200  s++; /* skip 'p' */
201  neg1 = isneg(&s); /* sign */
202  if (!lisdigit(cast_uchar(*s)))
203  return 0.0; /* invalid; must have at least one digit */
204  while (lisdigit(cast_uchar(*s))) /* read exponent */
205  exp1 = exp1 * 10 + *(s++) - '0';
206  if (neg1) exp1 = -exp1;
207  e += exp1;
208  *endptr = cast_charp(s); /* valid up to here */
209  }
210  if (neg) r = -r;
211  return l_mathop(ldexp)(r, e);
212 }
213 
214 #endif
215 /* }====================================================== */
216 
217 
218 /* maximum length of a numeral to be converted to a number */
219 #if !defined (L_MAXLENNUM)
220 #define L_MAXLENNUM 200
221 #endif
222 
223 /*
224 ** Convert string 's' to a Lua number (put in 'result'). Return NULL on
225 ** fail or the address of the ending '\0' on success. ('mode' == 'x')
226 ** means a hexadecimal numeral.
227 */
228 static const char *l_str2dloc (const char *s, lua_Number *result, int mode) {
229  char *endptr;
230  *result = (mode == 'x') ? lua_strx2number(s, &endptr) /* try to convert */
231  : lua_str2number(s, &endptr);
232  if (endptr == s) return NULL; /* nothing recognized? */
233  while (lisspace(cast_uchar(*endptr))) endptr++; /* skip trailing spaces */
234  return (*endptr == '\0') ? endptr : NULL; /* OK iff no trailing chars */
235 }
236 
237 
238 /*
239 ** Convert string 's' to a Lua number (put in 'result') handling the
240 ** current locale.
241 ** This function accepts both the current locale or a dot as the radix
242 ** mark. If the conversion fails, it may mean number has a dot but
243 ** locale accepts something else. In that case, the code copies 's'
244 ** to a buffer (because 's' is read-only), changes the dot to the
245 ** current locale radix mark, and tries to convert again.
246 ** The variable 'mode' checks for special characters in the string:
247 ** - 'n' means 'inf' or 'nan' (which should be rejected)
248 ** - 'x' means a hexadecimal numeral
249 ** - '.' just optimizes the search for the common case (no special chars)
250 */
251 static const char *l_str2d (const char *s, lua_Number *result) {
252  const char *endptr;
253  const char *pmode = strpbrk(s, ".xXnN"); /* look for special chars */
254  int mode = pmode ? ltolower(cast_uchar(*pmode)) : 0;
255  if (mode == 'n') /* reject 'inf' and 'nan' */
256  return NULL;
257  endptr = l_str2dloc(s, result, mode); /* try to convert */
258  if (endptr == NULL) { /* failed? may be a different locale */
259  char buff[L_MAXLENNUM + 1];
260  const char *pdot = strchr(s, '.');
261  if (pdot == NULL || strlen(s) > L_MAXLENNUM)
262  return NULL; /* string too long or no dot; fail */
263  strcpy(buff, s); /* copy string to buffer */
264  buff[pdot - s] = lua_getlocaledecpoint(); /* correct decimal point */
265  endptr = l_str2dloc(buff, result, mode); /* try again */
266  if (endptr != NULL)
267  endptr = s + (endptr - buff); /* make relative to 's' */
268  }
269  return endptr;
270 }
271 
272 
273 #define MAXBY10 cast(lua_Unsigned, LUA_MAXINTEGER / 10)
274 #define MAXLASTD cast_int(LUA_MAXINTEGER % 10)
275 
276 static const char *l_str2int (const char *s, lua_Integer *result) {
277  lua_Unsigned a = 0;
278  int empty = 1;
279  int neg;
280  while (lisspace(cast_uchar(*s))) s++; /* skip initial spaces */
281  neg = isneg(&s);
282  if (s[0] == '0' &&
283  (s[1] == 'x' || s[1] == 'X')) { /* hex? */
284  s += 2; /* skip '0x' */
285  for (; lisxdigit(cast_uchar(*s)); s++) {
286  a = a * 16 + luaO_hexavalue(*s);
287  empty = 0;
288  }
289  }
290  else { /* decimal */
291  for (; lisdigit(cast_uchar(*s)); s++) {
292  int d = *s - '0';
293  if (a >= MAXBY10 && (a > MAXBY10 || d > MAXLASTD + neg)) /* overflow? */
294  return NULL; /* do not accept it (as integer) */
295  a = a * 10 + d;
296  empty = 0;
297  }
298  }
299  while (lisspace(cast_uchar(*s))) s++; /* skip trailing spaces */
300  if (empty || *s != '\0') return NULL; /* something wrong in the numeral */
301  else {
302  *result = l_castU2S((neg) ? 0u - a : a);
303  return s;
304  }
305 }
306 
307 
308 size_t luaO_str2num (const char *s, TValue *o) {
310  const char *e;
311  if ((e = l_str2int(s, &i)) != NULL) { /* try as an integer */
312  setivalue(o, i);
313  }
314  else if ((e = l_str2d(s, &n)) != NULL) { /* else try as a float */
315  setfltvalue(o, n);
316  }
317  else
318  return 0; /* conversion failed */
319  return (e - s) + 1; /* success; return string size */
320 }
321 
322 
323 int luaO_utf8esc (char *buff, unsigned long x) {
324  int n = 1; /* number of bytes put in buffer (backwards) */
325  lua_assert(x <= 0x7FFFFFFFu);
326  if (x < 0x80) /* ascii? */
327  buff[UTF8BUFFSZ - 1] = cast_char(x);
328  else { /* need continuation bytes */
329  unsigned int mfb = 0x3f; /* maximum that fits in first byte */
330  do { /* add continuation bytes */
331  buff[UTF8BUFFSZ - (n++)] = cast_char(0x80 | (x & 0x3f));
332  x >>= 6; /* remove added bits */
333  mfb >>= 1; /* now there is one less bit available in first byte */
334  } while (x > mfb); /* still needs continuation byte? */
335  buff[UTF8BUFFSZ - n] = cast_char((~mfb << 1) | x); /* add first byte */
336  }
337  return n;
338 }
339 
340 
341 /*
342 ** Maximum length of the conversion of a number to a string. Must be
343 ** enough to accommodate both LUA_INTEGER_FMT and LUA_NUMBER_FMT.
344 ** (For a long long int, this is 19 digits plus a sign and a final '\0',
345 ** adding to 21. For a long double, it can go to a sign, 33 digits,
346 ** the dot, an exponent letter, an exponent sign, 5 exponent digits,
347 ** and a final '\0', adding to 43.)
348 */
349 #define MAXNUMBER2STR 44
350 
351 
352 /*
353 ** Convert a number object to a string, adding it to a buffer
354 */
355 static int tostringbuff (TValue *obj, char *buff) {
356  int len;
357  lua_assert(ttisnumber(obj));
358  if (ttisinteger(obj))
359  len = lua_integer2str(buff, MAXNUMBER2STR, ivalue(obj));
360  else {
361  len = lua_number2str(buff, MAXNUMBER2STR, fltvalue(obj));
362  if (buff[strspn(buff, "-0123456789")] == '\0') { /* looks like an int? */
363  buff[len++] = lua_getlocaledecpoint();
364  buff[len++] = '0'; /* adds '.0' to result */
365  }
366  }
367  return len;
368 }
369 
370 
371 /*
372 ** Convert a number object to a Lua string, replacing the value at 'obj'
373 */
374 void luaO_tostring (lua_State *L, TValue *obj) {
375  char buff[MAXNUMBER2STR];
376  int len = tostringbuff(obj, buff);
377  setsvalue(L, obj, luaS_newlstr(L, buff, len));
378 }
379 
380 
381 
382 
383 /*
384 ** {==================================================================
385 ** 'luaO_pushvfstring'
386 ** ===================================================================
387 */
388 
389 /* size for buffer space used by 'luaO_pushvfstring' */
390 #define BUFVFS 200
391 
392 /* buffer used by 'luaO_pushvfstring' */
393 typedef struct BuffFS {
395  int pushed; /* number of string pieces already on the stack */
396  int blen; /* length of partial string in 'space' */
397  char space[BUFVFS]; /* holds last part of the result */
398 } BuffFS;
399 
400 
401 /*
402 ** Push given string to the stack, as part of the buffer, and
403 ** join the partial strings in the stack into one.
404 */
405 static void pushstr (BuffFS *buff, const char *str, size_t l) {
406  lua_State *L = buff->L;
407  setsvalue2s(L, L->top, luaS_newlstr(L, str, l));
408  L->top++; /* may use one extra slot */
409  buff->pushed++;
410  luaV_concat(L, buff->pushed); /* join partial results into one */
411  buff->pushed = 1;
412 }
413 
414 
415 /*
416 ** empty the buffer space into the stack
417 */
418 static void clearbuff (BuffFS *buff) {
419  pushstr(buff, buff->space, buff->blen); /* push buffer contents */
420  buff->blen = 0; /* space now is empty */
421 }
422 
423 
424 /*
425 ** Get a space of size 'sz' in the buffer. If buffer has not enough
426 ** space, empty it. 'sz' must fit in an empty buffer.
427 */
428 static char *getbuff (BuffFS *buff, int sz) {
429  lua_assert(buff->blen <= BUFVFS); lua_assert(sz <= BUFVFS);
430  if (sz > BUFVFS - buff->blen) /* not enough space? */
431  clearbuff(buff);
432  return buff->space + buff->blen;
433 }
434 
435 
436 #define addsize(b,sz) ((b)->blen += (sz))
437 
438 
439 /*
440 ** Add 'str' to the buffer. If string is larger than the buffer space,
441 ** push the string directly to the stack.
442 */
443 static void addstr2buff (BuffFS *buff, const char *str, size_t slen) {
444  if (slen <= BUFVFS) { /* does string fit into buffer? */
445  char *bf = getbuff(buff, cast_int(slen));
446  memcpy(bf, str, slen); /* add string to buffer */
447  addsize(buff, cast_int(slen));
448  }
449  else { /* string larger than buffer */
450  clearbuff(buff); /* string comes after buffer's content */
451  pushstr(buff, str, slen); /* push string */
452  }
453 }
454 
455 
456 /*
457 ** Add a number to the buffer.
458 */
459 static void addnum2buff (BuffFS *buff, TValue *num) {
460  char *numbuff = getbuff(buff, MAXNUMBER2STR);
461  int len = tostringbuff(num, numbuff); /* format number into 'numbuff' */
462  addsize(buff, len);
463 }
464 
465 
466 /*
467 ** this function handles only '%d', '%c', '%f', '%p', '%s', and '%%'
468  conventional formats, plus Lua-specific '%I' and '%U'
469 */
470 const char *luaO_pushvfstring (lua_State *L, const char *fmt, va_list argp) {
471  BuffFS buff; /* holds last part of the result */
472  const char *e; /* points to next '%' */
473  buff.pushed = buff.blen = 0;
474  buff.L = L;
475  while ((e = strchr(fmt, '%')) != NULL) {
476  addstr2buff(&buff, fmt, e - fmt); /* add 'fmt' up to '%' */
477  switch (*(e + 1)) { /* conversion specifier */
478  case 's': { /* zero-terminated string */
479  const char *s = va_arg(argp, char *);
480  if (s == NULL) s = "(null)";
481  addstr2buff(&buff, s, strlen(s));
482  break;
483  }
484  case 'c': { /* an 'int' as a character */
485  char c = cast_uchar(va_arg(argp, int));
486  addstr2buff(&buff, &c, sizeof(char));
487  break;
488  }
489  case 'd': { /* an 'int' */
490  TValue num;
491  setivalue(&num, va_arg(argp, int));
492  addnum2buff(&buff, &num);
493  break;
494  }
495  case 'I': { /* a 'lua_Integer' */
496  TValue num;
497  setivalue(&num, cast(lua_Integer, va_arg(argp, l_uacInt)));
498  addnum2buff(&buff, &num);
499  break;
500  }
501  case 'f': { /* a 'lua_Number' */
502  TValue num;
503  setfltvalue(&num, cast_num(va_arg(argp, l_uacNumber)));
504  addnum2buff(&buff, &num);
505  break;
506  }
507  case 'p': { /* a pointer */
508  const int sz = 3 * sizeof(void*) + 8; /* enough space for '%p' */
509  char *bf = getbuff(&buff, sz);
510  void *p = va_arg(argp, void *);
511  int len = lua_pointer2str(bf, sz, p);
512  addsize(&buff, len);
513  break;
514  }
515  case 'U': { /* a 'long' as a UTF-8 sequence */
516  char bf[UTF8BUFFSZ];
517  int len = luaO_utf8esc(bf, va_arg(argp, long));
518  addstr2buff(&buff, bf + UTF8BUFFSZ - len, len);
519  break;
520  }
521  case '%': {
522  addstr2buff(&buff, "%", 1);
523  break;
524  }
525  default: {
526  luaG_runerror(L, "invalid option '%%%c' to 'lua_pushfstring'",
527  *(e + 1));
528  }
529  }
530  fmt = e + 2; /* skip '%' and the specifier */
531  }
532  addstr2buff(&buff, fmt, strlen(fmt)); /* rest of 'fmt' */
533  clearbuff(&buff); /* empty buffer into the stack */
534  lua_assert(buff.pushed == 1);
535  return svalue(s2v(L->top - 1));
536 }
537 
538 
539 const char *luaO_pushfstring (lua_State *L, const char *fmt, ...) {
540  const char *msg;
541  va_list argp;
542  va_start(argp, fmt);
543  msg = luaO_pushvfstring(L, fmt, argp);
544  va_end(argp);
545  return msg;
546 }
547 
548 /* }================================================================== */
549 
550 
551 #define RETS "..."
552 #define PRE "[string \""
553 #define POS "\"]"
554 
555 #define addstr(a,b,l) ( memcpy(a,b,(l) * sizeof(char)), a += (l) )
556 
557 void luaO_chunkid (char *out, const char *source, size_t srclen) {
558  size_t bufflen = LUA_IDSIZE; /* free space in buffer */
559  if (*source == '=') { /* 'literal' source */
560  if (srclen <= bufflen) /* small enough? */
561  memcpy(out, source + 1, srclen * sizeof(char));
562  else { /* truncate it */
563  addstr(out, source + 1, bufflen - 1);
564  *out = '\0';
565  }
566  }
567  else if (*source == '@') { /* file name */
568  if (srclen <= bufflen) /* small enough? */
569  memcpy(out, source + 1, srclen * sizeof(char));
570  else { /* add '...' before rest of name */
571  addstr(out, RETS, LL(RETS));
572  bufflen -= LL(RETS);
573  memcpy(out, source + 1 + srclen - bufflen, bufflen * sizeof(char));
574  }
575  }
576  else { /* string; format as [string "source"] */
577  const char *nl = strchr(source, '\n'); /* find first new line (if any) */
578  addstr(out, PRE, LL(PRE)); /* add prefix */
579  bufflen -= LL(PRE RETS POS) + 1; /* save space for prefix+suffix+'\0' */
580  if (srclen < bufflen && nl == NULL) { /* small one-line source? */
581  addstr(out, source, srclen); /* keep it */
582  }
583  else {
584  if (nl != NULL) srclen = nl - source; /* stop at first newline */
585  if (srclen > bufflen) srclen = bufflen;
586  addstr(out, source, srclen);
587  addstr(out, RETS, LL(RETS));
588  }
589  memcpy(out, POS, (LL(POS) + 1) * sizeof(char));
590  }
591 }
592 
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