]>
git.zerfleddert.de Git - proxmark3-svn/blob - liblua/lbaselib.c
2 ** $Id: lbaselib.c,v 1.276 2013/02/21 13:44:53 roberto Exp $
4 ** See Copyright Notice in lua.h
23 static int luaB_print (lua_State
*L
) {
24 int n
= lua_gettop(L
); /* number of arguments */
26 lua_getglobal(L
, "tostring");
27 for (i
=1; i
<=n
; i
++) {
30 lua_pushvalue(L
, -1); /* function to be called */
31 lua_pushvalue(L
, i
); /* value to print */
33 s
= lua_tolstring(L
, -1, &l
); /* get result */
36 LUA_QL("tostring") " must return a string to " LUA_QL("print"));
37 if (i
>1) luai_writestring("\t", 1);
38 luai_writestring(s
, l
);
39 lua_pop(L
, 1); /* pop result */
46 #define SPACECHARS " \f\n\r\t\v"
48 static int luaB_tonumber (lua_State
*L
) {
49 if (lua_isnoneornil(L
, 2)) { /* standard conversion */
51 lua_Number n
= lua_tonumberx(L
, 1, &isnum
);
55 } /* else not a number; must be something */
60 const char *s
= luaL_checklstring(L
, 1, &l
);
61 const char *e
= s
+ l
; /* end point for 's' */
62 int base
= luaL_checkint(L
, 2);
64 luaL_argcheck(L
, 2 <= base
&& base
<= 36, 2, "base out of range");
65 s
+= strspn(s
, SPACECHARS
); /* skip initial spaces */
66 if (*s
== '-') { s
++; neg
= 1; } /* handle signal */
67 else if (*s
== '+') s
++;
68 if (isalnum((unsigned char)*s
)) {
71 int digit
= (isdigit((unsigned char)*s
)) ? *s
- '0'
72 : toupper((unsigned char)*s
) - 'A' + 10;
73 if (digit
>= base
) break; /* invalid numeral; force a fail */
74 n
= n
* (lua_Number
)base
+ (lua_Number
)digit
;
76 } while (isalnum((unsigned char)*s
));
77 s
+= strspn(s
, SPACECHARS
); /* skip trailing spaces */
78 if (s
== e
) { /* no invalid trailing characters? */
79 lua_pushnumber(L
, (neg
) ? -n
: n
);
81 } /* else not a number */
82 } /* else not a number */
84 lua_pushnil(L
); /* not a number */
89 static int luaB_error (lua_State
*L
) {
90 int level
= luaL_optint(L
, 2, 1);
92 if (lua_isstring(L
, 1) && level
> 0) { /* add extra information? */
101 static int luaB_getmetatable (lua_State
*L
) {
103 if (!lua_getmetatable(L
, 1)) {
105 return 1; /* no metatable */
107 luaL_getmetafield(L
, 1, "__metatable");
108 return 1; /* returns either __metatable field (if present) or metatable */
112 static int luaB_setmetatable (lua_State
*L
) {
113 int t
= lua_type(L
, 2);
114 luaL_checktype(L
, 1, LUA_TTABLE
);
115 luaL_argcheck(L
, t
== LUA_TNIL
|| t
== LUA_TTABLE
, 2,
116 "nil or table expected");
117 if (luaL_getmetafield(L
, 1, "__metatable"))
118 return luaL_error(L
, "cannot change a protected metatable");
120 lua_setmetatable(L
, 1);
125 static int luaB_rawequal (lua_State
*L
) {
128 lua_pushboolean(L
, lua_rawequal(L
, 1, 2));
133 static int luaB_rawlen (lua_State
*L
) {
134 int t
= lua_type(L
, 1);
135 luaL_argcheck(L
, t
== LUA_TTABLE
|| t
== LUA_TSTRING
, 1,
136 "table or string expected");
137 lua_pushinteger(L
, lua_rawlen(L
, 1));
142 static int luaB_rawget (lua_State
*L
) {
143 luaL_checktype(L
, 1, LUA_TTABLE
);
150 static int luaB_rawset (lua_State
*L
) {
151 luaL_checktype(L
, 1, LUA_TTABLE
);
160 static int luaB_collectgarbage (lua_State
*L
) {
161 static const char *const opts
[] = {"stop", "restart", "collect",
162 "count", "step", "setpause", "setstepmul",
163 "setmajorinc", "isrunning", "generational", "incremental", NULL
};
164 static const int optsnum
[] = {LUA_GCSTOP
, LUA_GCRESTART
, LUA_GCCOLLECT
,
165 LUA_GCCOUNT
, LUA_GCSTEP
, LUA_GCSETPAUSE
, LUA_GCSETSTEPMUL
,
166 LUA_GCSETMAJORINC
, LUA_GCISRUNNING
, LUA_GCGEN
, LUA_GCINC
};
167 int o
= optsnum
[luaL_checkoption(L
, 1, "collect", opts
)];
168 int ex
= luaL_optint(L
, 2, 0);
169 int res
= lua_gc(L
, o
, ex
);
172 int b
= lua_gc(L
, LUA_GCCOUNTB
, 0);
173 lua_pushnumber(L
, res
+ ((lua_Number
)b
/1024));
174 lua_pushinteger(L
, b
);
177 case LUA_GCSTEP
: case LUA_GCISRUNNING
: {
178 lua_pushboolean(L
, res
);
182 lua_pushinteger(L
, res
);
189 static int luaB_type (lua_State
*L
) {
191 lua_pushstring(L
, luaL_typename(L
, 1));
196 static int pairsmeta (lua_State
*L
, const char *method
, int iszero
,
197 lua_CFunction iter
) {
198 if (!luaL_getmetafield(L
, 1, method
)) { /* no metamethod? */
199 luaL_checktype(L
, 1, LUA_TTABLE
); /* argument must be a table */
200 lua_pushcfunction(L
, iter
); /* will return generator, */
201 lua_pushvalue(L
, 1); /* state, */
202 if (iszero
) lua_pushinteger(L
, 0); /* and initial value */
206 lua_pushvalue(L
, 1); /* argument 'self' to metamethod */
207 lua_call(L
, 1, 3); /* get 3 values from metamethod */
213 static int luaB_next (lua_State
*L
) {
214 luaL_checktype(L
, 1, LUA_TTABLE
);
215 lua_settop(L
, 2); /* create a 2nd argument if there isn't one */
225 static int luaB_pairs (lua_State
*L
) {
226 return pairsmeta(L
, "__pairs", 0, luaB_next
);
230 static int ipairsaux (lua_State
*L
) {
231 int i
= luaL_checkint(L
, 2);
232 luaL_checktype(L
, 1, LUA_TTABLE
);
233 i
++; /* next value */
234 lua_pushinteger(L
, i
);
235 lua_rawgeti(L
, 1, i
);
236 return (lua_isnil(L
, -1)) ? 1 : 2;
240 static int luaB_ipairs (lua_State
*L
) {
241 return pairsmeta(L
, "__ipairs", 1, ipairsaux
);
245 static int load_aux (lua_State
*L
, int status
, int envidx
) {
246 if (status
== LUA_OK
) {
247 if (envidx
!= 0) { /* 'env' parameter? */
248 lua_pushvalue(L
, envidx
); /* environment for loaded function */
249 if (!lua_setupvalue(L
, -2, 1)) /* set it as 1st upvalue */
250 lua_pop(L
, 1); /* remove 'env' if not used by previous call */
254 else { /* error (message is on top of the stack) */
256 lua_insert(L
, -2); /* put before error message */
257 return 2; /* return nil plus error message */
262 static int luaB_loadfile (lua_State
*L
) {
263 const char *fname
= luaL_optstring(L
, 1, NULL
);
264 const char *mode
= luaL_optstring(L
, 2, NULL
);
265 int env
= (!lua_isnone(L
, 3) ? 3 : 0); /* 'env' index or 0 if no 'env' */
266 int status
= luaL_loadfilex(L
, fname
, mode
);
267 return load_aux(L
, status
, env
);
272 ** {======================================================
273 ** Generic Read function
274 ** =======================================================
279 ** reserved slot, above all arguments, to hold a copy of the returned
280 ** string to avoid it being collected while parsed. 'load' has four
281 ** optional arguments (chunk, source name, mode, and environment).
283 #define RESERVEDSLOT 5
287 ** Reader for generic `load' function: `lua_load' uses the
288 ** stack for internal stuff, so the reader cannot change the
289 ** stack top. Instead, it keeps its resulting string in a
290 ** reserved slot inside the stack.
292 static const char *generic_reader (lua_State
*L
, void *ud
, size_t *size
) {
293 (void)(ud
); /* not used */
294 luaL_checkstack(L
, 2, "too many nested functions");
295 lua_pushvalue(L
, 1); /* get function */
296 lua_call(L
, 0, 1); /* call it */
297 if (lua_isnil(L
, -1)) {
298 lua_pop(L
, 1); /* pop result */
302 else if (!lua_isstring(L
, -1))
303 luaL_error(L
, "reader function must return a string");
304 lua_replace(L
, RESERVEDSLOT
); /* save string in reserved slot */
305 return lua_tolstring(L
, RESERVEDSLOT
, size
);
309 static int luaB_load (lua_State
*L
) {
312 const char *s
= lua_tolstring(L
, 1, &l
);
313 const char *mode
= luaL_optstring(L
, 3, "bt");
314 int env
= (!lua_isnone(L
, 4) ? 4 : 0); /* 'env' index or 0 if no 'env' */
315 if (s
!= NULL
) { /* loading a string? */
316 const char *chunkname
= luaL_optstring(L
, 2, s
);
317 status
= luaL_loadbufferx(L
, s
, l
, chunkname
, mode
);
319 else { /* loading from a reader function */
320 const char *chunkname
= luaL_optstring(L
, 2, "=(load)");
321 luaL_checktype(L
, 1, LUA_TFUNCTION
);
322 lua_settop(L
, RESERVEDSLOT
); /* create reserved slot */
323 status
= lua_load(L
, generic_reader
, NULL
, chunkname
, mode
);
325 return load_aux(L
, status
, env
);
328 /* }====================================================== */
331 static int dofilecont (lua_State
*L
) {
332 return lua_gettop(L
) - 1;
336 static int luaB_dofile (lua_State
*L
) {
337 const char *fname
= luaL_optstring(L
, 1, NULL
);
339 if (luaL_loadfile(L
, fname
) != LUA_OK
)
341 lua_callk(L
, 0, LUA_MULTRET
, 0, dofilecont
);
342 return dofilecont(L
);
346 static int luaB_assert (lua_State
*L
) {
347 if (!lua_toboolean(L
, 1))
348 return luaL_error(L
, "%s", luaL_optstring(L
, 2, "assertion failed!"));
349 return lua_gettop(L
);
353 static int luaB_select (lua_State
*L
) {
354 int n
= lua_gettop(L
);
355 if (lua_type(L
, 1) == LUA_TSTRING
&& *lua_tostring(L
, 1) == '#') {
356 lua_pushinteger(L
, n
-1);
360 int i
= luaL_checkint(L
, 1);
361 if (i
< 0) i
= n
+ i
;
362 else if (i
> n
) i
= n
;
363 luaL_argcheck(L
, 1 <= i
, 1, "index out of range");
369 static int finishpcall (lua_State
*L
, int status
) {
370 if (!lua_checkstack(L
, 1)) { /* no space for extra boolean? */
371 lua_settop(L
, 0); /* create space for return values */
372 lua_pushboolean(L
, 0);
373 lua_pushstring(L
, "stack overflow");
374 return 2; /* return false, msg */
376 lua_pushboolean(L
, status
); /* first result (status) */
377 lua_replace(L
, 1); /* put first result in first slot */
378 return lua_gettop(L
);
382 static int pcallcont (lua_State
*L
) {
383 int status
= lua_getctx(L
, NULL
);
384 return finishpcall(L
, (status
== LUA_YIELD
));
388 static int luaB_pcall (lua_State
*L
) {
392 lua_insert(L
, 1); /* create space for status result */
393 status
= lua_pcallk(L
, lua_gettop(L
) - 2, LUA_MULTRET
, 0, 0, pcallcont
);
394 return finishpcall(L
, (status
== LUA_OK
));
398 static int luaB_xpcall (lua_State
*L
) {
400 int n
= lua_gettop(L
);
401 luaL_argcheck(L
, n
>= 2, 2, "value expected");
402 lua_pushvalue(L
, 1); /* exchange function... */
403 lua_copy(L
, 2, 1); /* ...and error handler */
405 status
= lua_pcallk(L
, n
- 2, LUA_MULTRET
, 1, 0, pcallcont
);
406 return finishpcall(L
, (status
== LUA_OK
));
410 static int luaB_tostring (lua_State
*L
) {
412 luaL_tolstring(L
, 1, NULL
);
417 static const luaL_Reg base_funcs
[] = {
418 {"assert", luaB_assert
},
419 {"collectgarbage", luaB_collectgarbage
},
420 {"dofile", luaB_dofile
},
421 {"error", luaB_error
},
422 {"getmetatable", luaB_getmetatable
},
423 {"ipairs", luaB_ipairs
},
424 {"loadfile", luaB_loadfile
},
426 #if defined(LUA_COMPAT_LOADSTRING)
427 {"loadstring", luaB_load
},
430 {"pairs", luaB_pairs
},
431 {"pcall", luaB_pcall
},
432 {"print", luaB_print
},
433 {"rawequal", luaB_rawequal
},
434 {"rawlen", luaB_rawlen
},
435 {"rawget", luaB_rawget
},
436 {"rawset", luaB_rawset
},
437 {"select", luaB_select
},
438 {"setmetatable", luaB_setmetatable
},
439 {"tonumber", luaB_tonumber
},
440 {"tostring", luaB_tostring
},
442 {"xpcall", luaB_xpcall
},
447 LUAMOD_API
int luaopen_base (lua_State
*L
) {
449 lua_pushglobaltable(L
);
450 lua_pushglobaltable(L
);
451 lua_setfield(L
, -2, "_G");
452 /* open lib into global table */
453 luaL_setfuncs(L
, base_funcs
, 0);
454 lua_pushliteral(L
, LUA_VERSION
);
455 lua_setfield(L
, -2, "_VERSION"); /* set global _VERSION */