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authorLi Jin <dragon-fly@qq.com>2022-10-31 11:32:33 +0800
committerLi Jin <dragon-fly@qq.com>2022-11-09 11:29:32 +0800
commit417ec1a37922c6178900adfec70628cad46731ff (patch)
treea5a2d74927ad2c41b5a16264a78409e1c0334b72 /win-build/Lua53/lobject.c
parent3dd607c8887d2fe0186668aabca31bb84a41e2da (diff)
downloadyuescript-417ec1a37922c6178900adfec70628cad46731ff.tar.gz
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fix issue #112 and issue #113.
Diffstat (limited to 'win-build/Lua53/lobject.c')
-rw-r--r--win-build/Lua53/lobject.c522
1 files changed, 522 insertions, 0 deletions
diff --git a/win-build/Lua53/lobject.c b/win-build/Lua53/lobject.c
new file mode 100644
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+++ b/win-build/Lua53/lobject.c
@@ -0,0 +1,522 @@
1/*
2** $Id: lobject.c,v 2.113.1.1 2017/04/19 17:29:57 roberto Exp $
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
33LUAI_DDEF const TValue luaO_nilobject_ = {NILCONSTANT};
34
35
36/*
37** converts an integer to a "floating point byte", represented as
38** (eeeeexxx), where the real value is (1xxx) * 2^(eeeee - 1) if
39** eeeee != 0 and (xxx) otherwise.
40*/
41int luaO_int2fb (unsigned int x) {
42 int e = 0; /* exponent */
43 if (x < 8) return x;
44 while (x >= (8 << 4)) { /* coarse steps */
45 x = (x + 0xf) >> 4; /* x = ceil(x / 16) */
46 e += 4;
47 }
48 while (x >= (8 << 1)) { /* fine steps */
49 x = (x + 1) >> 1; /* x = ceil(x / 2) */
50 e++;
51 }
52 return ((e+1) << 3) | (cast_int(x) - 8);
53}
54
55
56/* converts back */
57int luaO_fb2int (int x) {
58 return (x < 8) ? x : ((x & 7) + 8) << ((x >> 3) - 1);
59}
60
61
62/*
63** Computes ceil(log2(x))
64*/
65int luaO_ceillog2 (unsigned int x) {
66 static const lu_byte log_2[256] = { /* log_2[i] = ceil(log2(i - 1)) */
67 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,
68 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,
69 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,
70 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,
71 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
72 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
73 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
74 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8
75 };
76 int l = 0;
77 x--;
78 while (x >= 256) { l += 8; x >>= 8; }
79 return l + log_2[x];
80}
81
82
83static lua_Integer intarith (lua_State *L, int op, lua_Integer v1,
84 lua_Integer v2) {
85 switch (op) {
86 case LUA_OPADD: return intop(+, v1, v2);
87 case LUA_OPSUB:return intop(-, v1, v2);
88 case LUA_OPMUL:return intop(*, v1, v2);
89 case LUA_OPMOD: return luaV_mod(L, v1, v2);
90 case LUA_OPIDIV: return luaV_div(L, v1, v2);
91 case LUA_OPBAND: return intop(&, v1, v2);
92 case LUA_OPBOR: return intop(|, v1, v2);
93 case LUA_OPBXOR: return intop(^, v1, v2);
94 case LUA_OPSHL: return luaV_shiftl(v1, v2);
95 case LUA_OPSHR: return luaV_shiftl(v1, -v2);
96 case LUA_OPUNM: return intop(-, 0, v1);
97 case LUA_OPBNOT: return intop(^, ~l_castS2U(0), v1);
98 default: lua_assert(0); return 0;
99 }
100}
101
102
103static lua_Number numarith (lua_State *L, int op, lua_Number v1,
104 lua_Number v2) {
105 switch (op) {
106 case LUA_OPADD: return luai_numadd(L, v1, v2);
107 case LUA_OPSUB: return luai_numsub(L, v1, v2);
108 case LUA_OPMUL: return luai_nummul(L, v1, v2);
109 case LUA_OPDIV: return luai_numdiv(L, v1, v2);
110 case LUA_OPPOW: return luai_numpow(L, v1, v2);
111 case LUA_OPIDIV: return luai_numidiv(L, v1, v2);
112 case LUA_OPUNM: return luai_numunm(L, v1);
113 case LUA_OPMOD: {
114 lua_Number m;
115 luai_nummod(L, v1, v2, m);
116 return m;
117 }
118 default: lua_assert(0); return 0;
119 }
120}
121
122
123void luaO_arith (lua_State *L, int op, const TValue *p1, const TValue *p2,
124 TValue *res) {
125 switch (op) {
126 case LUA_OPBAND: case LUA_OPBOR: case LUA_OPBXOR:
127 case LUA_OPSHL: case LUA_OPSHR:
128 case LUA_OPBNOT: { /* operate only on integers */
129 lua_Integer i1; lua_Integer i2;
130 if (tointeger(p1, &i1) && tointeger(p2, &i2)) {
131 setivalue(res, intarith(L, op, i1, i2));
132 return;
133 }
134 else break; /* go to the end */
135 }
136 case LUA_OPDIV: case LUA_OPPOW: { /* operate only on floats */
137 lua_Number n1; lua_Number n2;
138 if (tonumber(p1, &n1) && tonumber(p2, &n2)) {
139 setfltvalue(res, numarith(L, op, n1, n2));
140 return;
141 }
142 else break; /* go to the end */
143 }
144 default: { /* other operations */
145 lua_Number n1; lua_Number n2;
146 if (ttisinteger(p1) && ttisinteger(p2)) {
147 setivalue(res, intarith(L, op, ivalue(p1), ivalue(p2)));
148 return;
149 }
150 else if (tonumber(p1, &n1) && tonumber(p2, &n2)) {
151 setfltvalue(res, numarith(L, op, n1, n2));
152 return;
153 }
154 else break; /* go to the end */
155 }
156 }
157 /* could not perform raw operation; try metamethod */
158 lua_assert(L != NULL); /* should not fail when folding (compile time) */
159 luaT_trybinTM(L, p1, p2, res, cast(TMS, (op - LUA_OPADD) + TM_ADD));
160}
161
162
163int luaO_hexavalue (int c) {
164 if (lisdigit(c)) return c - '0';
165 else return (ltolower(c) - 'a') + 10;
166}
167
168
169static int isneg (const char **s) {
170 if (**s == '-') { (*s)++; return 1; }
171 else if (**s == '+') (*s)++;
172 return 0;
173}
174
175
176
177/*
178** {==================================================================
179** Lua's implementation for 'lua_strx2number'
180** ===================================================================
181*/
182
183#if !defined(lua_strx2number)
184
185/* maximum number of significant digits to read (to avoid overflows
186 even with single floats) */
187#define MAXSIGDIG 30
188
189/*
190** convert an hexadecimal numeric string to a number, following
191** C99 specification for 'strtod'
192*/
193static lua_Number lua_strx2number (const char *s, char **endptr) {
194 int dot = lua_getlocaledecpoint();
195 lua_Number r = 0.0; /* result (accumulator) */
196 int sigdig = 0; /* number of significant digits */
197 int nosigdig = 0; /* number of non-significant digits */
198 int e = 0; /* exponent correction */
199 int neg; /* 1 if number is negative */
200 int hasdot = 0; /* true after seen a dot */
201 *endptr = cast(char *, s); /* nothing is valid yet */
202 while (lisspace(cast_uchar(*s))) s++; /* skip initial spaces */
203 neg = isneg(&s); /* check signal */
204 if (!(*s == '0' && (*(s + 1) == 'x' || *(s + 1) == 'X'))) /* check '0x' */
205 return 0.0; /* invalid format (no '0x') */
206 for (s += 2; ; s++) { /* skip '0x' and read numeral */
207 if (*s == dot) {
208 if (hasdot) break; /* second dot? stop loop */
209 else hasdot = 1;
210 }
211 else if (lisxdigit(cast_uchar(*s))) {
212 if (sigdig == 0 && *s == '0') /* non-significant digit (zero)? */
213 nosigdig++;
214 else if (++sigdig <= MAXSIGDIG) /* can read it without overflow? */
215 r = (r * cast_num(16.0)) + luaO_hexavalue(*s);
216 else e++; /* too many digits; ignore, but still count for exponent */
217 if (hasdot) e--; /* decimal digit? correct exponent */
218 }
219 else break; /* neither a dot nor a digit */
220 }
221 if (nosigdig + sigdig == 0) /* no digits? */
222 return 0.0; /* invalid format */
223 *endptr = cast(char *, s); /* valid up to here */
224 e *= 4; /* each digit multiplies/divides value by 2^4 */
225 if (*s == 'p' || *s == 'P') { /* exponent part? */
226 int exp1 = 0; /* exponent value */
227 int neg1; /* exponent signal */
228 s++; /* skip 'p' */
229 neg1 = isneg(&s); /* signal */
230 if (!lisdigit(cast_uchar(*s)))
231 return 0.0; /* invalid; must have at least one digit */
232 while (lisdigit(cast_uchar(*s))) /* read exponent */
233 exp1 = exp1 * 10 + *(s++) - '0';
234 if (neg1) exp1 = -exp1;
235 e += exp1;
236 *endptr = cast(char *, s); /* valid up to here */
237 }
238 if (neg) r = -r;
239 return l_mathop(ldexp)(r, e);
240}
241
242#endif
243/* }====================================================== */
244
245
246/* maximum length of a numeral */
247#if !defined (L_MAXLENNUM)
248#define L_MAXLENNUM 200
249#endif
250
251static const char *l_str2dloc (const char *s, lua_Number *result, int mode) {
252 char *endptr;
253 *result = (mode == 'x') ? lua_strx2number(s, &endptr) /* try to convert */
254 : lua_str2number(s, &endptr);
255 if (endptr == s) return NULL; /* nothing recognized? */
256 while (lisspace(cast_uchar(*endptr))) endptr++; /* skip trailing spaces */
257 return (*endptr == '\0') ? endptr : NULL; /* OK if no trailing characters */
258}
259
260
261/*
262** Convert string 's' to a Lua number (put in 'result'). Return NULL
263** on fail or the address of the ending '\0' on success.
264** 'pmode' points to (and 'mode' contains) special things in the string:
265** - 'x'/'X' means an hexadecimal numeral
266** - 'n'/'N' means 'inf' or 'nan' (which should be rejected)
267** - '.' just optimizes the search for the common case (nothing special)
268** This function accepts both the current locale or a dot as the radix
269** mark. If the conversion fails, it may mean number has a dot but
270** locale accepts something else. In that case, the code copies 's'
271** to a buffer (because 's' is read-only), changes the dot to the
272** current locale radix mark, and tries to convert again.
273*/
274static const char *l_str2d (const char *s, lua_Number *result) {
275 const char *endptr;
276 const char *pmode = strpbrk(s, ".xXnN");
277 int mode = pmode ? ltolower(cast_uchar(*pmode)) : 0;
278 if (mode == 'n') /* reject 'inf' and 'nan' */
279 return NULL;
280 endptr = l_str2dloc(s, result, mode); /* try to convert */
281 if (endptr == NULL) { /* failed? may be a different locale */
282 char buff[L_MAXLENNUM + 1];
283 const char *pdot = strchr(s, '.');
284 if (strlen(s) > L_MAXLENNUM || pdot == NULL)
285 return NULL; /* string too long or no dot; fail */
286 strcpy(buff, s); /* copy string to buffer */
287 buff[pdot - s] = lua_getlocaledecpoint(); /* correct decimal point */
288 endptr = l_str2dloc(buff, result, mode); /* try again */
289 if (endptr != NULL)
290 endptr = s + (endptr - buff); /* make relative to 's' */
291 }
292 return endptr;
293}
294
295
296#define MAXBY10 cast(lua_Unsigned, LUA_MAXINTEGER / 10)
297#define MAXLASTD cast_int(LUA_MAXINTEGER % 10)
298
299static const char *l_str2int (const char *s, lua_Integer *result) {
300 lua_Unsigned a = 0;
301 int empty = 1;
302 int neg;
303 while (lisspace(cast_uchar(*s))) s++; /* skip initial spaces */
304 neg = isneg(&s);
305 if (s[0] == '0' &&
306 (s[1] == 'x' || s[1] == 'X')) { /* hex? */
307 s += 2; /* skip '0x' */
308 for (; lisxdigit(cast_uchar(*s)); s++) {
309 a = a * 16 + luaO_hexavalue(*s);
310 empty = 0;
311 }
312 }
313 else { /* decimal */
314 for (; lisdigit(cast_uchar(*s)); s++) {
315 int d = *s - '0';
316 if (a >= MAXBY10 && (a > MAXBY10 || d > MAXLASTD + neg)) /* overflow? */
317 return NULL; /* do not accept it (as integer) */
318 a = a * 10 + d;
319 empty = 0;
320 }
321 }
322 while (lisspace(cast_uchar(*s))) s++; /* skip trailing spaces */
323 if (empty || *s != '\0') return NULL; /* something wrong in the numeral */
324 else {
325 *result = l_castU2S((neg) ? 0u - a : a);
326 return s;
327 }
328}
329
330
331size_t luaO_str2num (const char *s, TValue *o) {
332 lua_Integer i; lua_Number n;
333 const char *e;
334 if ((e = l_str2int(s, &i)) != NULL) { /* try as an integer */
335 setivalue(o, i);
336 }
337 else if ((e = l_str2d(s, &n)) != NULL) { /* else try as a float */
338 setfltvalue(o, n);
339 }
340 else
341 return 0; /* conversion failed */
342 return (e - s) + 1; /* success; return string size */
343}
344
345
346int luaO_utf8esc (char *buff, unsigned long x) {
347 int n = 1; /* number of bytes put in buffer (backwards) */
348 lua_assert(x <= 0x10FFFF);
349 if (x < 0x80) /* ascii? */
350 buff[UTF8BUFFSZ - 1] = cast(char, x);
351 else { /* need continuation bytes */
352 unsigned int mfb = 0x3f; /* maximum that fits in first byte */
353 do { /* add continuation bytes */
354 buff[UTF8BUFFSZ - (n++)] = cast(char, 0x80 | (x & 0x3f));
355 x >>= 6; /* remove added bits */
356 mfb >>= 1; /* now there is one less bit available in first byte */
357 } while (x > mfb); /* still needs continuation byte? */
358 buff[UTF8BUFFSZ - n] = cast(char, (~mfb << 1) | x); /* add first byte */
359 }
360 return n;
361}
362
363
364/* maximum length of the conversion of a number to a string */
365#define MAXNUMBER2STR 50
366
367
368/*
369** Convert a number object to a string
370*/
371void luaO_tostring (lua_State *L, StkId obj) {
372 char buff[MAXNUMBER2STR];
373 size_t len;
374 lua_assert(ttisnumber(obj));
375 if (ttisinteger(obj))
376 len = lua_integer2str(buff, sizeof(buff), ivalue(obj));
377 else {
378 len = lua_number2str(buff, sizeof(buff), fltvalue(obj));
379#if !defined(LUA_COMPAT_FLOATSTRING)
380 if (buff[strspn(buff, "-0123456789")] == '\0') { /* looks like an int? */
381 buff[len++] = lua_getlocaledecpoint();
382 buff[len++] = '0'; /* adds '.0' to result */
383 }
384#endif
385 }
386 setsvalue2s(L, obj, luaS_newlstr(L, buff, len));
387}
388
389
390static void pushstr (lua_State *L, const char *str, size_t l) {
391 setsvalue2s(L, L->top, luaS_newlstr(L, str, l));
392 luaD_inctop(L);
393}
394
395
396/*
397** this function handles only '%d', '%c', '%f', '%p', and '%s'
398 conventional formats, plus Lua-specific '%I' and '%U'
399*/
400const char *luaO_pushvfstring (lua_State *L, const char *fmt, va_list argp) {
401 int n = 0;
402 for (;;) {
403 const char *e = strchr(fmt, '%');
404 if (e == NULL) break;
405 pushstr(L, fmt, e - fmt);
406 switch (*(e+1)) {
407 case 's': { /* zero-terminated string */
408 const char *s = va_arg(argp, char *);
409 if (s == NULL) s = "(null)";
410 pushstr(L, s, strlen(s));
411 break;
412 }
413 case 'c': { /* an 'int' as a character */
414 char buff = cast(char, va_arg(argp, int));
415 if (lisprint(cast_uchar(buff)))
416 pushstr(L, &buff, 1);
417 else /* non-printable character; print its code */
418 luaO_pushfstring(L, "<\\%d>", cast_uchar(buff));
419 break;
420 }
421 case 'd': { /* an 'int' */
422 setivalue(L->top, va_arg(argp, int));
423 goto top2str;
424 }
425 case 'I': { /* a 'lua_Integer' */
426 setivalue(L->top, cast(lua_Integer, va_arg(argp, l_uacInt)));
427 goto top2str;
428 }
429 case 'f': { /* a 'lua_Number' */
430 setfltvalue(L->top, cast_num(va_arg(argp, l_uacNumber)));
431 top2str: /* convert the top element to a string */
432 luaD_inctop(L);
433 luaO_tostring(L, L->top - 1);
434 break;
435 }
436 case 'p': { /* a pointer */
437 char buff[4*sizeof(void *) + 8]; /* should be enough space for a '%p' */
438 void *p = va_arg(argp, void *);
439 int l = lua_pointer2str(buff, sizeof(buff), p);
440 pushstr(L, buff, l);
441 break;
442 }
443 case 'U': { /* an 'int' as a UTF-8 sequence */
444 char buff[UTF8BUFFSZ];
445 int l = luaO_utf8esc(buff, cast(long, va_arg(argp, long)));
446 pushstr(L, buff + UTF8BUFFSZ - l, l);
447 break;
448 }
449 case '%': {
450 pushstr(L, "%", 1);
451 break;
452 }
453 default: {
454 luaG_runerror(L, "invalid option '%%%c' to 'lua_pushfstring'",
455 *(e + 1));
456 }
457 }
458 n += 2;
459 fmt = e+2;
460 }
461 luaD_checkstack(L, 1);
462 pushstr(L, fmt, strlen(fmt));
463 if (n > 0) luaV_concat(L, n + 1);
464 return svalue(L->top - 1);
465}
466
467
468const char *luaO_pushfstring (lua_State *L, const char *fmt, ...) {
469 const char *msg;
470 va_list argp;
471 va_start(argp, fmt);
472 msg = luaO_pushvfstring(L, fmt, argp);
473 va_end(argp);
474 return msg;
475}
476
477
478/* number of chars of a literal string without the ending \0 */
479#define LL(x) (sizeof(x)/sizeof(char) - 1)
480
481#define RETS "..."
482#define PRE "[string \""
483#define POS "\"]"
484
485#define addstr(a,b,l) ( memcpy(a,b,(l) * sizeof(char)), a += (l) )
486
487void luaO_chunkid (char *out, const char *source, size_t bufflen) {
488 size_t l = strlen(source);
489 if (*source == '=') { /* 'literal' source */
490 if (l <= bufflen) /* small enough? */
491 memcpy(out, source + 1, l * sizeof(char));
492 else { /* truncate it */
493 addstr(out, source + 1, bufflen - 1);
494 *out = '\0';
495 }
496 }
497 else if (*source == '@') { /* file name */
498 if (l <= bufflen) /* small enough? */
499 memcpy(out, source + 1, l * sizeof(char));
500 else { /* add '...' before rest of name */
501 addstr(out, RETS, LL(RETS));
502 bufflen -= LL(RETS);
503 memcpy(out, source + 1 + l - bufflen, bufflen * sizeof(char));
504 }
505 }
506 else { /* string; format as [string "source"] */
507 const char *nl = strchr(source, '\n'); /* find first new line (if any) */
508 addstr(out, PRE, LL(PRE)); /* add prefix */
509 bufflen -= LL(PRE RETS POS) + 1; /* save space for prefix+suffix+'\0' */
510 if (l < bufflen && nl == NULL) { /* small one-line source? */
511 addstr(out, source, l); /* keep it */
512 }
513 else {
514 if (nl != NULL) l = nl - source; /* stop at first newline */
515 if (l > bufflen) l = bufflen;
516 addstr(out, source, l);
517 addstr(out, RETS, LL(RETS));
518 }
519 memcpy(out, POS, (LL(POS) + 1) * sizeof(char));
520 }
521}
522
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