]>
git.proxmox.com Git - ceph.git/blob - ceph/src/jaegertracing/opentelemetry-cpp/third_party/prometheus-cpp/3rdparty/civetweb/src/third_party/lua-5.3.6/src/lauxlib.c
2 ** $Id: lauxlib.c,v 1.289.1.1 2017/04/19 17:20:42 roberto Exp $
3 ** Auxiliary functions for building Lua libraries
4 ** See Copyright Notice in lua.h
21 ** This file uses only the official API of Lua.
22 ** Any function declared here could be written as an application function.
31 ** {======================================================
33 ** =======================================================
37 #define LEVELS1 10 /* size of the first part of the stack */
38 #define LEVELS2 11 /* size of the second part of the stack */
43 ** search for 'objidx' in table at index -1.
44 ** return 1 + string at top if find a good name.
46 static int findfield (lua_State
*L
, int objidx
, int level
) {
47 if (level
== 0 || !lua_istable(L
, -1))
48 return 0; /* not found */
49 lua_pushnil(L
); /* start 'next' loop */
50 while (lua_next(L
, -2)) { /* for each pair in table */
51 if (lua_type(L
, -2) == LUA_TSTRING
) { /* ignore non-string keys */
52 if (lua_rawequal(L
, objidx
, -1)) { /* found object? */
53 lua_pop(L
, 1); /* remove value (but keep name) */
56 else if (findfield(L
, objidx
, level
- 1)) { /* try recursively */
57 lua_remove(L
, -2); /* remove table (but keep name) */
58 lua_pushliteral(L
, ".");
59 lua_insert(L
, -2); /* place '.' between the two names */
64 lua_pop(L
, 1); /* remove value */
66 return 0; /* not found */
71 ** Search for a name for a function in all loaded modules
73 static int pushglobalfuncname (lua_State
*L
, lua_Debug
*ar
) {
74 int top
= lua_gettop(L
);
75 lua_getinfo(L
, "f", ar
); /* push function */
76 lua_getfield(L
, LUA_REGISTRYINDEX
, LUA_LOADED_TABLE
);
77 if (findfield(L
, top
+ 1, 2)) {
78 const char *name
= lua_tostring(L
, -1);
79 if (strncmp(name
, "_G.", 3) == 0) { /* name start with '_G.'? */
80 lua_pushstring(L
, name
+ 3); /* push name without prefix */
81 lua_remove(L
, -2); /* remove original name */
83 lua_copy(L
, -1, top
+ 1); /* move name to proper place */
84 lua_pop(L
, 2); /* remove pushed values */
88 lua_settop(L
, top
); /* remove function and global table */
94 static void pushfuncname (lua_State
*L
, lua_Debug
*ar
) {
95 if (pushglobalfuncname(L
, ar
)) { /* try first a global name */
96 lua_pushfstring(L
, "function '%s'", lua_tostring(L
, -1));
97 lua_remove(L
, -2); /* remove name */
99 else if (*ar
->namewhat
!= '\0') /* is there a name from code? */
100 lua_pushfstring(L
, "%s '%s'", ar
->namewhat
, ar
->name
); /* use it */
101 else if (*ar
->what
== 'm') /* main? */
102 lua_pushliteral(L
, "main chunk");
103 else if (*ar
->what
!= 'C') /* for Lua functions, use <file:line> */
104 lua_pushfstring(L
, "function <%s:%d>", ar
->short_src
, ar
->linedefined
);
105 else /* nothing left... */
106 lua_pushliteral(L
, "?");
110 static int lastlevel (lua_State
*L
) {
113 /* find an upper bound */
114 while (lua_getstack(L
, le
, &ar
)) { li
= le
; le
*= 2; }
115 /* do a binary search */
118 if (lua_getstack(L
, m
, &ar
)) li
= m
+ 1;
125 LUALIB_API
void luaL_traceback (lua_State
*L
, lua_State
*L1
,
126 const char *msg
, int level
) {
128 int top
= lua_gettop(L
);
129 int last
= lastlevel(L1
);
130 int n1
= (last
- level
> LEVELS1
+ LEVELS2
) ? LEVELS1
: -1;
132 lua_pushfstring(L
, "%s\n", msg
);
133 luaL_checkstack(L
, 10, NULL
);
134 lua_pushliteral(L
, "stack traceback:");
135 while (lua_getstack(L1
, level
++, &ar
)) {
136 if (n1
-- == 0) { /* too many levels? */
137 lua_pushliteral(L
, "\n\t..."); /* add a '...' */
138 level
= last
- LEVELS2
+ 1; /* and skip to last ones */
141 lua_getinfo(L1
, "Slnt", &ar
);
142 lua_pushfstring(L
, "\n\t%s:", ar
.short_src
);
143 if (ar
.currentline
> 0)
144 lua_pushfstring(L
, "%d:", ar
.currentline
);
145 lua_pushliteral(L
, " in ");
146 pushfuncname(L
, &ar
);
148 lua_pushliteral(L
, "\n\t(...tail calls...)");
149 lua_concat(L
, lua_gettop(L
) - top
);
152 lua_concat(L
, lua_gettop(L
) - top
);
155 /* }====================================================== */
159 ** {======================================================
160 ** Error-report functions
161 ** =======================================================
164 LUALIB_API
int luaL_argerror (lua_State
*L
, int arg
, const char *extramsg
) {
166 if (!lua_getstack(L
, 0, &ar
)) /* no stack frame? */
167 return luaL_error(L
, "bad argument #%d (%s)", arg
, extramsg
);
168 lua_getinfo(L
, "n", &ar
);
169 if (strcmp(ar
.namewhat
, "method") == 0) {
170 arg
--; /* do not count 'self' */
171 if (arg
== 0) /* error is in the self argument itself? */
172 return luaL_error(L
, "calling '%s' on bad self (%s)",
176 ar
.name
= (pushglobalfuncname(L
, &ar
)) ? lua_tostring(L
, -1) : "?";
177 return luaL_error(L
, "bad argument #%d to '%s' (%s)",
178 arg
, ar
.name
, extramsg
);
182 static int typeerror (lua_State
*L
, int arg
, const char *tname
) {
184 const char *typearg
; /* name for the type of the actual argument */
185 if (luaL_getmetafield(L
, arg
, "__name") == LUA_TSTRING
)
186 typearg
= lua_tostring(L
, -1); /* use the given type name */
187 else if (lua_type(L
, arg
) == LUA_TLIGHTUSERDATA
)
188 typearg
= "light userdata"; /* special name for messages */
190 typearg
= luaL_typename(L
, arg
); /* standard name */
191 msg
= lua_pushfstring(L
, "%s expected, got %s", tname
, typearg
);
192 return luaL_argerror(L
, arg
, msg
);
196 static void tag_error (lua_State
*L
, int arg
, int tag
) {
197 typeerror(L
, arg
, lua_typename(L
, tag
));
202 ** The use of 'lua_pushfstring' ensures this function does not
203 ** need reserved stack space when called.
205 LUALIB_API
void luaL_where (lua_State
*L
, int level
) {
207 if (lua_getstack(L
, level
, &ar
)) { /* check function at level */
208 lua_getinfo(L
, "Sl", &ar
); /* get info about it */
209 if (ar
.currentline
> 0) { /* is there info? */
210 lua_pushfstring(L
, "%s:%d: ", ar
.short_src
, ar
.currentline
);
214 lua_pushfstring(L
, ""); /* else, no information available... */
219 ** Again, the use of 'lua_pushvfstring' ensures this function does
220 ** not need reserved stack space when called. (At worst, it generates
221 ** an error with "stack overflow" instead of the given message.)
223 LUALIB_API
int luaL_error (lua_State
*L
, const char *fmt
, ...) {
227 lua_pushvfstring(L
, fmt
, argp
);
234 LUALIB_API
int luaL_fileresult (lua_State
*L
, int stat
, const char *fname
) {
235 int en
= errno
; /* calls to Lua API may change this value */
237 lua_pushboolean(L
, 1);
243 lua_pushfstring(L
, "%s: %s", fname
, strerror(en
));
245 lua_pushstring(L
, strerror(en
));
246 lua_pushinteger(L
, en
);
252 #if !defined(l_inspectstat) /* { */
254 #if defined(LUA_USE_POSIX)
256 #include <sys/wait.h>
259 ** use appropriate macros to interpret 'pclose' return status
261 #define l_inspectstat(stat,what) \
262 if (WIFEXITED(stat)) { stat = WEXITSTATUS(stat); } \
263 else if (WIFSIGNALED(stat)) { stat = WTERMSIG(stat); what = "signal"; }
267 #define l_inspectstat(stat,what) /* no op */
274 LUALIB_API
int luaL_execresult (lua_State
*L
, int stat
) {
275 const char *what
= "exit"; /* type of termination */
276 if (stat
== -1) /* error? */
277 return luaL_fileresult(L
, 0, NULL
);
279 l_inspectstat(stat
, what
); /* interpret result */
280 if (*what
== 'e' && stat
== 0) /* successful termination? */
281 lua_pushboolean(L
, 1);
284 lua_pushstring(L
, what
);
285 lua_pushinteger(L
, stat
);
286 return 3; /* return true/nil,what,code */
290 /* }====================================================== */
294 ** {======================================================
295 ** Userdata's metatable manipulation
296 ** =======================================================
299 LUALIB_API
int luaL_newmetatable (lua_State
*L
, const char *tname
) {
300 if (luaL_getmetatable(L
, tname
) != LUA_TNIL
) /* name already in use? */
301 return 0; /* leave previous value on top, but return 0 */
303 lua_createtable(L
, 0, 2); /* create metatable */
304 lua_pushstring(L
, tname
);
305 lua_setfield(L
, -2, "__name"); /* metatable.__name = tname */
306 lua_pushvalue(L
, -1);
307 lua_setfield(L
, LUA_REGISTRYINDEX
, tname
); /* registry.name = metatable */
312 LUALIB_API
void luaL_setmetatable (lua_State
*L
, const char *tname
) {
313 luaL_getmetatable(L
, tname
);
314 lua_setmetatable(L
, -2);
318 LUALIB_API
void *luaL_testudata (lua_State
*L
, int ud
, const char *tname
) {
319 void *p
= lua_touserdata(L
, ud
);
320 if (p
!= NULL
) { /* value is a userdata? */
321 if (lua_getmetatable(L
, ud
)) { /* does it have a metatable? */
322 luaL_getmetatable(L
, tname
); /* get correct metatable */
323 if (!lua_rawequal(L
, -1, -2)) /* not the same? */
324 p
= NULL
; /* value is a userdata with wrong metatable */
325 lua_pop(L
, 2); /* remove both metatables */
329 return NULL
; /* value is not a userdata with a metatable */
333 LUALIB_API
void *luaL_checkudata (lua_State
*L
, int ud
, const char *tname
) {
334 void *p
= luaL_testudata(L
, ud
, tname
);
335 if (p
== NULL
) typeerror(L
, ud
, tname
);
339 /* }====================================================== */
343 ** {======================================================
344 ** Argument check functions
345 ** =======================================================
348 LUALIB_API
int luaL_checkoption (lua_State
*L
, int arg
, const char *def
,
349 const char *const lst
[]) {
350 const char *name
= (def
) ? luaL_optstring(L
, arg
, def
) :
351 luaL_checkstring(L
, arg
);
353 for (i
=0; lst
[i
]; i
++)
354 if (strcmp(lst
[i
], name
) == 0)
356 return luaL_argerror(L
, arg
,
357 lua_pushfstring(L
, "invalid option '%s'", name
));
362 ** Ensures the stack has at least 'space' extra slots, raising an error
363 ** if it cannot fulfill the request. (The error handling needs a few
364 ** extra slots to format the error message. In case of an error without
365 ** this extra space, Lua will generate the same 'stack overflow' error,
366 ** but without 'msg'.)
368 LUALIB_API
void luaL_checkstack (lua_State
*L
, int space
, const char *msg
) {
369 if (!lua_checkstack(L
, space
)) {
371 luaL_error(L
, "stack overflow (%s)", msg
);
373 luaL_error(L
, "stack overflow");
378 LUALIB_API
void luaL_checktype (lua_State
*L
, int arg
, int t
) {
379 if (lua_type(L
, arg
) != t
)
380 tag_error(L
, arg
, t
);
384 LUALIB_API
void luaL_checkany (lua_State
*L
, int arg
) {
385 if (lua_type(L
, arg
) == LUA_TNONE
)
386 luaL_argerror(L
, arg
, "value expected");
390 LUALIB_API
const char *luaL_checklstring (lua_State
*L
, int arg
, size_t *len
) {
391 const char *s
= lua_tolstring(L
, arg
, len
);
392 if (!s
) tag_error(L
, arg
, LUA_TSTRING
);
397 LUALIB_API
const char *luaL_optlstring (lua_State
*L
, int arg
,
398 const char *def
, size_t *len
) {
399 if (lua_isnoneornil(L
, arg
)) {
401 *len
= (def
? strlen(def
) : 0);
404 else return luaL_checklstring(L
, arg
, len
);
408 LUALIB_API lua_Number
luaL_checknumber (lua_State
*L
, int arg
) {
410 lua_Number d
= lua_tonumberx(L
, arg
, &isnum
);
412 tag_error(L
, arg
, LUA_TNUMBER
);
417 LUALIB_API lua_Number
luaL_optnumber (lua_State
*L
, int arg
, lua_Number def
) {
418 return luaL_opt(L
, luaL_checknumber
, arg
, def
);
422 static void interror (lua_State
*L
, int arg
) {
423 if (lua_isnumber(L
, arg
))
424 luaL_argerror(L
, arg
, "number has no integer representation");
426 tag_error(L
, arg
, LUA_TNUMBER
);
430 LUALIB_API lua_Integer
luaL_checkinteger (lua_State
*L
, int arg
) {
432 lua_Integer d
= lua_tointegerx(L
, arg
, &isnum
);
440 LUALIB_API lua_Integer
luaL_optinteger (lua_State
*L
, int arg
,
442 return luaL_opt(L
, luaL_checkinteger
, arg
, def
);
445 /* }====================================================== */
449 ** {======================================================
450 ** Generic Buffer manipulation
451 ** =======================================================
454 /* userdata to box arbitrary data */
455 typedef struct UBox
{
461 static void *resizebox (lua_State
*L
, int idx
, size_t newsize
) {
463 lua_Alloc allocf
= lua_getallocf(L
, &ud
);
464 UBox
*box
= (UBox
*)lua_touserdata(L
, idx
);
465 void *temp
= allocf(ud
, box
->box
, box
->bsize
, newsize
);
466 if (temp
== NULL
&& newsize
> 0) { /* allocation error? */
467 resizebox(L
, idx
, 0); /* free buffer */
468 luaL_error(L
, "not enough memory for buffer allocation");
471 box
->bsize
= newsize
;
476 static int boxgc (lua_State
*L
) {
482 static void *newbox (lua_State
*L
, size_t newsize
) {
483 UBox
*box
= (UBox
*)lua_newuserdata(L
, sizeof(UBox
));
486 if (luaL_newmetatable(L
, "LUABOX")) { /* creating metatable? */
487 lua_pushcfunction(L
, boxgc
);
488 lua_setfield(L
, -2, "__gc"); /* metatable.__gc = boxgc */
490 lua_setmetatable(L
, -2);
491 return resizebox(L
, -1, newsize
);
496 ** check whether buffer is using a userdata on the stack as a temporary
499 #define buffonstack(B) ((B)->b != (B)->initb)
503 ** returns a pointer to a free area with at least 'sz' bytes
505 LUALIB_API
char *luaL_prepbuffsize (luaL_Buffer
*B
, size_t sz
) {
507 if (B
->size
- B
->n
< sz
) { /* not enough space? */
509 size_t newsize
= B
->size
* 2; /* double buffer size */
510 if (newsize
- B
->n
< sz
) /* not big enough? */
512 if (newsize
< B
->n
|| newsize
- B
->n
< sz
)
513 luaL_error(L
, "buffer too large");
514 /* create larger buffer */
516 newbuff
= (char *)resizebox(L
, -1, newsize
);
517 else { /* no buffer yet */
518 newbuff
= (char *)newbox(L
, newsize
);
519 memcpy(newbuff
, B
->b
, B
->n
* sizeof(char)); /* copy original content */
528 LUALIB_API
void luaL_addlstring (luaL_Buffer
*B
, const char *s
, size_t l
) {
529 if (l
> 0) { /* avoid 'memcpy' when 's' can be NULL */
530 char *b
= luaL_prepbuffsize(B
, l
);
531 memcpy(b
, s
, l
* sizeof(char));
537 LUALIB_API
void luaL_addstring (luaL_Buffer
*B
, const char *s
) {
538 luaL_addlstring(B
, s
, strlen(s
));
542 LUALIB_API
void luaL_pushresult (luaL_Buffer
*B
) {
544 lua_pushlstring(L
, B
->b
, B
->n
);
545 if (buffonstack(B
)) {
546 resizebox(L
, -2, 0); /* delete old buffer */
547 lua_remove(L
, -2); /* remove its header from the stack */
552 LUALIB_API
void luaL_pushresultsize (luaL_Buffer
*B
, size_t sz
) {
558 LUALIB_API
void luaL_addvalue (luaL_Buffer
*B
) {
561 const char *s
= lua_tolstring(L
, -1, &l
);
563 lua_insert(L
, -2); /* put value below buffer */
564 luaL_addlstring(B
, s
, l
);
565 lua_remove(L
, (buffonstack(B
)) ? -2 : -1); /* remove value */
569 LUALIB_API
void luaL_buffinit (lua_State
*L
, luaL_Buffer
*B
) {
573 B
->size
= LUAL_BUFFERSIZE
;
577 LUALIB_API
char *luaL_buffinitsize (lua_State
*L
, luaL_Buffer
*B
, size_t sz
) {
579 return luaL_prepbuffsize(B
, sz
);
582 /* }====================================================== */
586 ** {======================================================
588 ** =======================================================
591 /* index of free-list header */
595 LUALIB_API
int luaL_ref (lua_State
*L
, int t
) {
597 if (lua_isnil(L
, -1)) {
598 lua_pop(L
, 1); /* remove from stack */
599 return LUA_REFNIL
; /* 'nil' has a unique fixed reference */
601 t
= lua_absindex(L
, t
);
602 lua_rawgeti(L
, t
, freelist
); /* get first free element */
603 ref
= (int)lua_tointeger(L
, -1); /* ref = t[freelist] */
604 lua_pop(L
, 1); /* remove it from stack */
605 if (ref
!= 0) { /* any free element? */
606 lua_rawgeti(L
, t
, ref
); /* remove it from list */
607 lua_rawseti(L
, t
, freelist
); /* (t[freelist] = t[ref]) */
609 else /* no free elements */
610 ref
= (int)lua_rawlen(L
, t
) + 1; /* get a new reference */
611 lua_rawseti(L
, t
, ref
);
616 LUALIB_API
void luaL_unref (lua_State
*L
, int t
, int ref
) {
618 t
= lua_absindex(L
, t
);
619 lua_rawgeti(L
, t
, freelist
);
620 lua_rawseti(L
, t
, ref
); /* t[ref] = t[freelist] */
621 lua_pushinteger(L
, ref
);
622 lua_rawseti(L
, t
, freelist
); /* t[freelist] = ref */
626 /* }====================================================== */
630 ** {======================================================
632 ** =======================================================
635 typedef struct LoadF
{
636 int n
; /* number of pre-read characters */
637 FILE *f
; /* file being read */
638 char buff
[BUFSIZ
]; /* area for reading file */
642 static const char *getF (lua_State
*L
, void *ud
, size_t *size
) {
643 LoadF
*lf
= (LoadF
*)ud
;
644 (void)L
; /* not used */
645 if (lf
->n
> 0) { /* are there pre-read characters to be read? */
646 *size
= lf
->n
; /* return them (chars already in buffer) */
647 lf
->n
= 0; /* no more pre-read characters */
649 else { /* read a block from file */
650 /* 'fread' can return > 0 *and* set the EOF flag. If next call to
651 'getF' called 'fread', it might still wait for user input.
652 The next check avoids this problem. */
653 if (feof(lf
->f
)) return NULL
;
654 *size
= fread(lf
->buff
, 1, sizeof(lf
->buff
), lf
->f
); /* read block */
660 static int errfile (lua_State
*L
, const char *what
, int fnameindex
) {
661 const char *serr
= strerror(errno
);
662 const char *filename
= lua_tostring(L
, fnameindex
) + 1;
663 lua_pushfstring(L
, "cannot %s %s: %s", what
, filename
, serr
);
664 lua_remove(L
, fnameindex
);
669 static int skipBOM (LoadF
*lf
) {
670 const char *p
= "\xEF\xBB\xBF"; /* UTF-8 BOM mark */
675 if (c
== EOF
|| c
!= *(const unsigned char *)p
++) return c
;
676 lf
->buff
[lf
->n
++] = c
; /* to be read by the parser */
677 } while (*p
!= '\0');
678 lf
->n
= 0; /* prefix matched; discard it */
679 return getc(lf
->f
); /* return next character */
684 ** reads the first character of file 'f' and skips an optional BOM mark
685 ** in its beginning plus its first line if it starts with '#'. Returns
686 ** true if it skipped the first line. In any case, '*cp' has the
687 ** first "valid" character of the file (after the optional BOM and
688 ** a first-line comment).
690 static int skipcomment (LoadF
*lf
, int *cp
) {
691 int c
= *cp
= skipBOM(lf
);
692 if (c
== '#') { /* first line is a comment (Unix exec. file)? */
693 do { /* skip first line */
695 } while (c
!= EOF
&& c
!= '\n');
696 *cp
= getc(lf
->f
); /* skip end-of-line, if present */
697 return 1; /* there was a comment */
699 else return 0; /* no comment */
703 LUALIB_API
int luaL_loadfilex (lua_State
*L
, const char *filename
,
706 int status
, readstatus
;
708 int fnameindex
= lua_gettop(L
) + 1; /* index of filename on the stack */
709 if (filename
== NULL
) {
710 lua_pushliteral(L
, "=stdin");
714 lua_pushfstring(L
, "@%s", filename
);
715 lf
.f
= fopen(filename
, "r");
716 if (lf
.f
== NULL
) return errfile(L
, "open", fnameindex
);
718 if (skipcomment(&lf
, &c
)) /* read initial portion */
719 lf
.buff
[lf
.n
++] = '\n'; /* add line to correct line numbers */
720 if (c
== LUA_SIGNATURE
[0] && filename
) { /* binary file? */
721 lf
.f
= freopen(filename
, "rb", lf
.f
); /* reopen in binary mode */
722 if (lf
.f
== NULL
) return errfile(L
, "reopen", fnameindex
);
723 skipcomment(&lf
, &c
); /* re-read initial portion */
726 lf
.buff
[lf
.n
++] = c
; /* 'c' is the first character of the stream */
727 status
= lua_load(L
, getF
, &lf
, lua_tostring(L
, -1), mode
);
728 readstatus
= ferror(lf
.f
);
729 if (filename
) fclose(lf
.f
); /* close file (even in case of errors) */
731 lua_settop(L
, fnameindex
); /* ignore results from 'lua_load' */
732 return errfile(L
, "read", fnameindex
);
734 lua_remove(L
, fnameindex
);
739 typedef struct LoadS
{
745 static const char *getS (lua_State
*L
, void *ud
, size_t *size
) {
746 LoadS
*ls
= (LoadS
*)ud
;
747 (void)L
; /* not used */
748 if (ls
->size
== 0) return NULL
;
755 LUALIB_API
int luaL_loadbufferx (lua_State
*L
, const char *buff
, size_t size
,
756 const char *name
, const char *mode
) {
760 return lua_load(L
, getS
, &ls
, name
, mode
);
764 LUALIB_API
int luaL_loadstring (lua_State
*L
, const char *s
) {
765 return luaL_loadbuffer(L
, s
, strlen(s
), s
);
768 /* }====================================================== */
772 LUALIB_API
int luaL_getmetafield (lua_State
*L
, int obj
, const char *event
) {
773 if (!lua_getmetatable(L
, obj
)) /* no metatable? */
777 lua_pushstring(L
, event
);
778 tt
= lua_rawget(L
, -2);
779 if (tt
== LUA_TNIL
) /* is metafield nil? */
780 lua_pop(L
, 2); /* remove metatable and metafield */
782 lua_remove(L
, -2); /* remove only metatable */
783 return tt
; /* return metafield type */
788 LUALIB_API
int luaL_callmeta (lua_State
*L
, int obj
, const char *event
) {
789 obj
= lua_absindex(L
, obj
);
790 if (luaL_getmetafield(L
, obj
, event
) == LUA_TNIL
) /* no metafield? */
792 lua_pushvalue(L
, obj
);
798 LUALIB_API lua_Integer
luaL_len (lua_State
*L
, int idx
) {
802 l
= lua_tointegerx(L
, -1, &isnum
);
804 luaL_error(L
, "object length is not an integer");
805 lua_pop(L
, 1); /* remove object */
810 LUALIB_API
const char *luaL_tolstring (lua_State
*L
, int idx
, size_t *len
) {
811 if (luaL_callmeta(L
, idx
, "__tostring")) { /* metafield? */
812 if (!lua_isstring(L
, -1))
813 luaL_error(L
, "'__tostring' must return a string");
816 switch (lua_type(L
, idx
)) {
818 if (lua_isinteger(L
, idx
))
819 lua_pushfstring(L
, "%I", (LUAI_UACINT
)lua_tointeger(L
, idx
));
821 lua_pushfstring(L
, "%f", (LUAI_UACNUMBER
)lua_tonumber(L
, idx
));
825 lua_pushvalue(L
, idx
);
828 lua_pushstring(L
, (lua_toboolean(L
, idx
) ? "true" : "false"));
831 lua_pushliteral(L
, "nil");
834 int tt
= luaL_getmetafield(L
, idx
, "__name"); /* try name */
835 const char *kind
= (tt
== LUA_TSTRING
) ? lua_tostring(L
, -1) :
836 luaL_typename(L
, idx
);
837 lua_pushfstring(L
, "%s: %p", kind
, lua_topointer(L
, idx
));
839 lua_remove(L
, -2); /* remove '__name' */
844 return lua_tolstring(L
, -1, len
);
849 ** {======================================================
850 ** Compatibility with 5.1 module functions
851 ** =======================================================
853 #if defined(LUA_COMPAT_MODULE)
855 static const char *luaL_findtable (lua_State
*L
, int idx
,
856 const char *fname
, int szhint
) {
858 if (idx
) lua_pushvalue(L
, idx
);
860 e
= strchr(fname
, '.');
861 if (e
== NULL
) e
= fname
+ strlen(fname
);
862 lua_pushlstring(L
, fname
, e
- fname
);
863 if (lua_rawget(L
, -2) == LUA_TNIL
) { /* no such field? */
864 lua_pop(L
, 1); /* remove this nil */
865 lua_createtable(L
, 0, (*e
== '.' ? 1 : szhint
)); /* new table for field */
866 lua_pushlstring(L
, fname
, e
- fname
);
867 lua_pushvalue(L
, -2);
868 lua_settable(L
, -4); /* set new table into field */
870 else if (!lua_istable(L
, -1)) { /* field has a non-table value? */
871 lua_pop(L
, 2); /* remove table and value */
872 return fname
; /* return problematic part of the name */
874 lua_remove(L
, -2); /* remove previous table */
882 ** Count number of elements in a luaL_Reg list.
884 static int libsize (const luaL_Reg
*l
) {
886 for (; l
&& l
->name
; l
++) size
++;
892 ** Find or create a module table with a given name. The function
893 ** first looks at the LOADED table and, if that fails, try a
894 ** global variable with that name. In any case, leaves on the stack
897 LUALIB_API
void luaL_pushmodule (lua_State
*L
, const char *modname
,
899 luaL_findtable(L
, LUA_REGISTRYINDEX
, LUA_LOADED_TABLE
, 1);
900 if (lua_getfield(L
, -1, modname
) != LUA_TTABLE
) { /* no LOADED[modname]? */
901 lua_pop(L
, 1); /* remove previous result */
902 /* try global variable (and create one if it does not exist) */
903 lua_pushglobaltable(L
);
904 if (luaL_findtable(L
, 0, modname
, sizehint
) != NULL
)
905 luaL_error(L
, "name conflict for module '%s'", modname
);
906 lua_pushvalue(L
, -1);
907 lua_setfield(L
, -3, modname
); /* LOADED[modname] = new table */
909 lua_remove(L
, -2); /* remove LOADED table */
913 LUALIB_API
void luaL_openlib (lua_State
*L
, const char *libname
,
914 const luaL_Reg
*l
, int nup
) {
915 luaL_checkversion(L
);
917 luaL_pushmodule(L
, libname
, libsize(l
)); /* get/create library table */
918 lua_insert(L
, -(nup
+ 1)); /* move library table to below upvalues */
921 luaL_setfuncs(L
, l
, nup
);
923 lua_pop(L
, nup
); /* remove upvalues */
927 /* }====================================================== */
930 ** set functions from list 'l' into table at top - 'nup'; each
931 ** function gets the 'nup' elements at the top as upvalues.
932 ** Returns with only the table at the stack.
934 LUALIB_API
void luaL_setfuncs (lua_State
*L
, const luaL_Reg
*l
, int nup
) {
935 luaL_checkstack(L
, nup
, "too many upvalues");
936 for (; l
->name
!= NULL
; l
++) { /* fill the table with given functions */
938 for (i
= 0; i
< nup
; i
++) /* copy upvalues to the top */
939 lua_pushvalue(L
, -nup
);
940 lua_pushcclosure(L
, l
->func
, nup
); /* closure with those upvalues */
941 lua_setfield(L
, -(nup
+ 2), l
->name
);
943 lua_pop(L
, nup
); /* remove upvalues */
948 ** ensure that stack[idx][fname] has a table and push that table
951 LUALIB_API
int luaL_getsubtable (lua_State
*L
, int idx
, const char *fname
) {
952 if (lua_getfield(L
, idx
, fname
) == LUA_TTABLE
)
953 return 1; /* table already there */
955 lua_pop(L
, 1); /* remove previous result */
956 idx
= lua_absindex(L
, idx
);
958 lua_pushvalue(L
, -1); /* copy to be left at top */
959 lua_setfield(L
, idx
, fname
); /* assign new table to field */
960 return 0; /* false, because did not find table there */
966 ** Stripped-down 'require': After checking "loaded" table, calls 'openf'
967 ** to open a module, registers the result in 'package.loaded' table and,
968 ** if 'glb' is true, also registers the result in the global table.
969 ** Leaves resulting module on the top.
971 LUALIB_API
void luaL_requiref (lua_State
*L
, const char *modname
,
972 lua_CFunction openf
, int glb
) {
973 luaL_getsubtable(L
, LUA_REGISTRYINDEX
, LUA_LOADED_TABLE
);
974 lua_getfield(L
, -1, modname
); /* LOADED[modname] */
975 if (!lua_toboolean(L
, -1)) { /* package not already loaded? */
976 lua_pop(L
, 1); /* remove field */
977 lua_pushcfunction(L
, openf
);
978 lua_pushstring(L
, modname
); /* argument to open function */
979 lua_call(L
, 1, 1); /* call 'openf' to open module */
980 lua_pushvalue(L
, -1); /* make copy of module (call result) */
981 lua_setfield(L
, -3, modname
); /* LOADED[modname] = module */
983 lua_remove(L
, -2); /* remove LOADED table */
985 lua_pushvalue(L
, -1); /* copy of module */
986 lua_setglobal(L
, modname
); /* _G[modname] = module */
991 LUALIB_API
const char *luaL_gsub (lua_State
*L
, const char *s
, const char *p
,
994 size_t l
= strlen(p
);
996 luaL_buffinit(L
, &b
);
997 while ((wild
= strstr(s
, p
)) != NULL
) {
998 luaL_addlstring(&b
, s
, wild
- s
); /* push prefix */
999 luaL_addstring(&b
, r
); /* push replacement in place of pattern */
1000 s
= wild
+ l
; /* continue after 'p' */
1002 luaL_addstring(&b
, s
); /* push last suffix */
1003 luaL_pushresult(&b
);
1004 return lua_tostring(L
, -1);
1008 static void *l_alloc (void *ud
, void *ptr
, size_t osize
, size_t nsize
) {
1009 (void)ud
; (void)osize
; /* not used */
1014 else { /* cannot fail when shrinking a block */
1015 void *newptr
= realloc(ptr
, nsize
);
1016 if (newptr
== NULL
&& ptr
!= NULL
&& nsize
<= osize
)
1017 return ptr
; /* keep the original block */
1018 else /* no fail or not shrinking */
1019 return newptr
; /* use the new block */
1024 static int panic (lua_State
*L
) {
1025 lua_writestringerror("PANIC: unprotected error in call to Lua API (%s)\n",
1026 lua_tostring(L
, -1));
1027 return 0; /* return to Lua to abort */
1031 LUALIB_API lua_State
*luaL_newstate (void) {
1032 lua_State
*L
= lua_newstate(l_alloc
, NULL
);
1033 if (L
) lua_atpanic(L
, &panic
);
1038 LUALIB_API
void luaL_checkversion_ (lua_State
*L
, lua_Number ver
, size_t sz
) {
1039 const lua_Number
*v
= lua_version(L
);
1040 if (sz
!= LUAL_NUMSIZES
) /* check numeric types */
1041 luaL_error(L
, "core and library have incompatible numeric types");
1042 if (v
!= lua_version(NULL
))
1043 luaL_error(L
, "multiple Lua VMs detected");
1045 luaL_error(L
, "version mismatch: app. needs %f, Lua core provides %f",
1046 (LUAI_UACNUMBER
)ver
, (LUAI_UACNUMBER
)*v
);