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Member "memcached-1.6.15/vendor/lua/src/lbaselib.c" (1 Oct 2021, 14902 Bytes) of package /linux/www/memcached-1.6.15.tar.gz:


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    1 /*
    2 ** $Id: lbaselib.c $
    3 ** Basic library
    4 ** See Copyright Notice in lua.h
    5 */
    6 
    7 #define lbaselib_c
    8 #define LUA_LIB
    9 
   10 #include "lprefix.h"
   11 
   12 
   13 #include <ctype.h>
   14 #include <stdio.h>
   15 #include <stdlib.h>
   16 #include <string.h>
   17 
   18 #include "lua.h"
   19 
   20 #include "lauxlib.h"
   21 #include "lualib.h"
   22 
   23 
   24 static int luaB_print (lua_State *L) {
   25   int n = lua_gettop(L);  /* number of arguments */
   26   int i;
   27   for (i = 1; i <= n; i++) {  /* for each argument */
   28     size_t l;
   29     const char *s = luaL_tolstring(L, i, &l);  /* convert it to string */
   30     if (i > 1)  /* not the first element? */
   31       lua_writestring("\t", 1);  /* add a tab before it */
   32     lua_writestring(s, l);  /* print it */
   33     lua_pop(L, 1);  /* pop result */
   34   }
   35   lua_writeline();
   36   return 0;
   37 }
   38 
   39 
   40 /*
   41 ** Creates a warning with all given arguments.
   42 ** Check first for errors; otherwise an error may interrupt
   43 ** the composition of a warning, leaving it unfinished.
   44 */
   45 static int luaB_warn (lua_State *L) {
   46   int n = lua_gettop(L);  /* number of arguments */
   47   int i;
   48   luaL_checkstring(L, 1);  /* at least one argument */
   49   for (i = 2; i <= n; i++)
   50     luaL_checkstring(L, i);  /* make sure all arguments are strings */
   51   for (i = 1; i < n; i++)  /* compose warning */
   52     lua_warning(L, lua_tostring(L, i), 1);
   53   lua_warning(L, lua_tostring(L, n), 0);  /* close warning */
   54   return 0;
   55 }
   56 
   57 
   58 #define SPACECHARS  " \f\n\r\t\v"
   59 
   60 static const char *b_str2int (const char *s, int base, lua_Integer *pn) {
   61   lua_Unsigned n = 0;
   62   int neg = 0;
   63   s += strspn(s, SPACECHARS);  /* skip initial spaces */
   64   if (*s == '-') { s++; neg = 1; }  /* handle sign */
   65   else if (*s == '+') s++;
   66   if (!isalnum((unsigned char)*s))  /* no digit? */
   67     return NULL;
   68   do {
   69     int digit = (isdigit((unsigned char)*s)) ? *s - '0'
   70                    : (toupper((unsigned char)*s) - 'A') + 10;
   71     if (digit >= base) return NULL;  /* invalid numeral */
   72     n = n * base + digit;
   73     s++;
   74   } while (isalnum((unsigned char)*s));
   75   s += strspn(s, SPACECHARS);  /* skip trailing spaces */
   76   *pn = (lua_Integer)((neg) ? (0u - n) : n);
   77   return s;
   78 }
   79 
   80 
   81 static int luaB_tonumber (lua_State *L) {
   82   if (lua_isnoneornil(L, 2)) {  /* standard conversion? */
   83     if (lua_type(L, 1) == LUA_TNUMBER) {  /* already a number? */
   84       lua_settop(L, 1);  /* yes; return it */
   85       return 1;
   86     }
   87     else {
   88       size_t l;
   89       const char *s = lua_tolstring(L, 1, &l);
   90       if (s != NULL && lua_stringtonumber(L, s) == l + 1)
   91         return 1;  /* successful conversion to number */
   92       /* else not a number */
   93       luaL_checkany(L, 1);  /* (but there must be some parameter) */
   94     }
   95   }
   96   else {
   97     size_t l;
   98     const char *s;
   99     lua_Integer n = 0;  /* to avoid warnings */
  100     lua_Integer base = luaL_checkinteger(L, 2);
  101     luaL_checktype(L, 1, LUA_TSTRING);  /* no numbers as strings */
  102     s = lua_tolstring(L, 1, &l);
  103     luaL_argcheck(L, 2 <= base && base <= 36, 2, "base out of range");
  104     if (b_str2int(s, (int)base, &n) == s + l) {
  105       lua_pushinteger(L, n);
  106       return 1;
  107     }  /* else not a number */
  108   }  /* else not a number */
  109   luaL_pushfail(L);  /* not a number */
  110   return 1;
  111 }
  112 
  113 
  114 static int luaB_error (lua_State *L) {
  115   int level = (int)luaL_optinteger(L, 2, 1);
  116   lua_settop(L, 1);
  117   if (lua_type(L, 1) == LUA_TSTRING && level > 0) {
  118     luaL_where(L, level);   /* add extra information */
  119     lua_pushvalue(L, 1);
  120     lua_concat(L, 2);
  121   }
  122   return lua_error(L);
  123 }
  124 
  125 
  126 static int luaB_getmetatable (lua_State *L) {
  127   luaL_checkany(L, 1);
  128   if (!lua_getmetatable(L, 1)) {
  129     lua_pushnil(L);
  130     return 1;  /* no metatable */
  131   }
  132   luaL_getmetafield(L, 1, "__metatable");
  133   return 1;  /* returns either __metatable field (if present) or metatable */
  134 }
  135 
  136 
  137 static int luaB_setmetatable (lua_State *L) {
  138   int t = lua_type(L, 2);
  139   luaL_checktype(L, 1, LUA_TTABLE);
  140   luaL_argexpected(L, t == LUA_TNIL || t == LUA_TTABLE, 2, "nil or table");
  141   if (l_unlikely(luaL_getmetafield(L, 1, "__metatable") != LUA_TNIL))
  142     return luaL_error(L, "cannot change a protected metatable");
  143   lua_settop(L, 2);
  144   lua_setmetatable(L, 1);
  145   return 1;
  146 }
  147 
  148 
  149 static int luaB_rawequal (lua_State *L) {
  150   luaL_checkany(L, 1);
  151   luaL_checkany(L, 2);
  152   lua_pushboolean(L, lua_rawequal(L, 1, 2));
  153   return 1;
  154 }
  155 
  156 
  157 static int luaB_rawlen (lua_State *L) {
  158   int t = lua_type(L, 1);
  159   luaL_argexpected(L, t == LUA_TTABLE || t == LUA_TSTRING, 1,
  160                       "table or string");
  161   lua_pushinteger(L, lua_rawlen(L, 1));
  162   return 1;
  163 }
  164 
  165 
  166 static int luaB_rawget (lua_State *L) {
  167   luaL_checktype(L, 1, LUA_TTABLE);
  168   luaL_checkany(L, 2);
  169   lua_settop(L, 2);
  170   lua_rawget(L, 1);
  171   return 1;
  172 }
  173 
  174 static int luaB_rawset (lua_State *L) {
  175   luaL_checktype(L, 1, LUA_TTABLE);
  176   luaL_checkany(L, 2);
  177   luaL_checkany(L, 3);
  178   lua_settop(L, 3);
  179   lua_rawset(L, 1);
  180   return 1;
  181 }
  182 
  183 
  184 static int pushmode (lua_State *L, int oldmode) {
  185   lua_pushstring(L, (oldmode == LUA_GCINC) ? "incremental"
  186                                            : "generational");
  187   return 1;
  188 }
  189 
  190 
  191 static int luaB_collectgarbage (lua_State *L) {
  192   static const char *const opts[] = {"stop", "restart", "collect",
  193     "count", "step", "setpause", "setstepmul",
  194     "isrunning", "generational", "incremental", NULL};
  195   static const int optsnum[] = {LUA_GCSTOP, LUA_GCRESTART, LUA_GCCOLLECT,
  196     LUA_GCCOUNT, LUA_GCSTEP, LUA_GCSETPAUSE, LUA_GCSETSTEPMUL,
  197     LUA_GCISRUNNING, LUA_GCGEN, LUA_GCINC};
  198   int o = optsnum[luaL_checkoption(L, 1, "collect", opts)];
  199   switch (o) {
  200     case LUA_GCCOUNT: {
  201       int k = lua_gc(L, o);
  202       int b = lua_gc(L, LUA_GCCOUNTB);
  203       lua_pushnumber(L, (lua_Number)k + ((lua_Number)b/1024));
  204       return 1;
  205     }
  206     case LUA_GCSTEP: {
  207       int step = (int)luaL_optinteger(L, 2, 0);
  208       int res = lua_gc(L, o, step);
  209       lua_pushboolean(L, res);
  210       return 1;
  211     }
  212     case LUA_GCSETPAUSE:
  213     case LUA_GCSETSTEPMUL: {
  214       int p = (int)luaL_optinteger(L, 2, 0);
  215       int previous = lua_gc(L, o, p);
  216       lua_pushinteger(L, previous);
  217       return 1;
  218     }
  219     case LUA_GCISRUNNING: {
  220       int res = lua_gc(L, o);
  221       lua_pushboolean(L, res);
  222       return 1;
  223     }
  224     case LUA_GCGEN: {
  225       int minormul = (int)luaL_optinteger(L, 2, 0);
  226       int majormul = (int)luaL_optinteger(L, 3, 0);
  227       return pushmode(L, lua_gc(L, o, minormul, majormul));
  228     }
  229     case LUA_GCINC: {
  230       int pause = (int)luaL_optinteger(L, 2, 0);
  231       int stepmul = (int)luaL_optinteger(L, 3, 0);
  232       int stepsize = (int)luaL_optinteger(L, 4, 0);
  233       return pushmode(L, lua_gc(L, o, pause, stepmul, stepsize));
  234     }
  235     default: {
  236       int res = lua_gc(L, o);
  237       lua_pushinteger(L, res);
  238       return 1;
  239     }
  240   }
  241 }
  242 
  243 
  244 static int luaB_type (lua_State *L) {
  245   int t = lua_type(L, 1);
  246   luaL_argcheck(L, t != LUA_TNONE, 1, "value expected");
  247   lua_pushstring(L, lua_typename(L, t));
  248   return 1;
  249 }
  250 
  251 
  252 static int luaB_next (lua_State *L) {
  253   luaL_checktype(L, 1, LUA_TTABLE);
  254   lua_settop(L, 2);  /* create a 2nd argument if there isn't one */
  255   if (lua_next(L, 1))
  256     return 2;
  257   else {
  258     lua_pushnil(L);
  259     return 1;
  260   }
  261 }
  262 
  263 
  264 static int luaB_pairs (lua_State *L) {
  265   luaL_checkany(L, 1);
  266   if (luaL_getmetafield(L, 1, "__pairs") == LUA_TNIL) {  /* no metamethod? */
  267     lua_pushcfunction(L, luaB_next);  /* will return generator, */
  268     lua_pushvalue(L, 1);  /* state, */
  269     lua_pushnil(L);  /* and initial value */
  270   }
  271   else {
  272     lua_pushvalue(L, 1);  /* argument 'self' to metamethod */
  273     lua_call(L, 1, 3);  /* get 3 values from metamethod */
  274   }
  275   return 3;
  276 }
  277 
  278 
  279 /*
  280 ** Traversal function for 'ipairs'
  281 */
  282 static int ipairsaux (lua_State *L) {
  283   lua_Integer i = luaL_checkinteger(L, 2) + 1;
  284   lua_pushinteger(L, i);
  285   return (lua_geti(L, 1, i) == LUA_TNIL) ? 1 : 2;
  286 }
  287 
  288 
  289 /*
  290 ** 'ipairs' function. Returns 'ipairsaux', given "table", 0.
  291 ** (The given "table" may not be a table.)
  292 */
  293 static int luaB_ipairs (lua_State *L) {
  294   luaL_checkany(L, 1);
  295   lua_pushcfunction(L, ipairsaux);  /* iteration function */
  296   lua_pushvalue(L, 1);  /* state */
  297   lua_pushinteger(L, 0);  /* initial value */
  298   return 3;
  299 }
  300 
  301 
  302 static int load_aux (lua_State *L, int status, int envidx) {
  303   if (l_likely(status == LUA_OK)) {
  304     if (envidx != 0) {  /* 'env' parameter? */
  305       lua_pushvalue(L, envidx);  /* environment for loaded function */
  306       if (!lua_setupvalue(L, -2, 1))  /* set it as 1st upvalue */
  307         lua_pop(L, 1);  /* remove 'env' if not used by previous call */
  308     }
  309     return 1;
  310   }
  311   else {  /* error (message is on top of the stack) */
  312     luaL_pushfail(L);
  313     lua_insert(L, -2);  /* put before error message */
  314     return 2;  /* return fail plus error message */
  315   }
  316 }
  317 
  318 
  319 static int luaB_loadfile (lua_State *L) {
  320   const char *fname = luaL_optstring(L, 1, NULL);
  321   const char *mode = luaL_optstring(L, 2, NULL);
  322   int env = (!lua_isnone(L, 3) ? 3 : 0);  /* 'env' index or 0 if no 'env' */
  323   int status = luaL_loadfilex(L, fname, mode);
  324   return load_aux(L, status, env);
  325 }
  326 
  327 
  328 /*
  329 ** {======================================================
  330 ** Generic Read function
  331 ** =======================================================
  332 */
  333 
  334 
  335 /*
  336 ** reserved slot, above all arguments, to hold a copy of the returned
  337 ** string to avoid it being collected while parsed. 'load' has four
  338 ** optional arguments (chunk, source name, mode, and environment).
  339 */
  340 #define RESERVEDSLOT    5
  341 
  342 
  343 /*
  344 ** Reader for generic 'load' function: 'lua_load' uses the
  345 ** stack for internal stuff, so the reader cannot change the
  346 ** stack top. Instead, it keeps its resulting string in a
  347 ** reserved slot inside the stack.
  348 */
  349 static const char *generic_reader (lua_State *L, void *ud, size_t *size) {
  350   (void)(ud);  /* not used */
  351   luaL_checkstack(L, 2, "too many nested functions");
  352   lua_pushvalue(L, 1);  /* get function */
  353   lua_call(L, 0, 1);  /* call it */
  354   if (lua_isnil(L, -1)) {
  355     lua_pop(L, 1);  /* pop result */
  356     *size = 0;
  357     return NULL;
  358   }
  359   else if (l_unlikely(!lua_isstring(L, -1)))
  360     luaL_error(L, "reader function must return a string");
  361   lua_replace(L, RESERVEDSLOT);  /* save string in reserved slot */
  362   return lua_tolstring(L, RESERVEDSLOT, size);
  363 }
  364 
  365 
  366 static int luaB_load (lua_State *L) {
  367   int status;
  368   size_t l;
  369   const char *s = lua_tolstring(L, 1, &l);
  370   const char *mode = luaL_optstring(L, 3, "bt");
  371   int env = (!lua_isnone(L, 4) ? 4 : 0);  /* 'env' index or 0 if no 'env' */
  372   if (s != NULL) {  /* loading a string? */
  373     const char *chunkname = luaL_optstring(L, 2, s);
  374     status = luaL_loadbufferx(L, s, l, chunkname, mode);
  375   }
  376   else {  /* loading from a reader function */
  377     const char *chunkname = luaL_optstring(L, 2, "=(load)");
  378     luaL_checktype(L, 1, LUA_TFUNCTION);
  379     lua_settop(L, RESERVEDSLOT);  /* create reserved slot */
  380     status = lua_load(L, generic_reader, NULL, chunkname, mode);
  381   }
  382   return load_aux(L, status, env);
  383 }
  384 
  385 /* }====================================================== */
  386 
  387 
  388 static int dofilecont (lua_State *L, int d1, lua_KContext d2) {
  389   (void)d1;  (void)d2;  /* only to match 'lua_Kfunction' prototype */
  390   return lua_gettop(L) - 1;
  391 }
  392 
  393 
  394 static int luaB_dofile (lua_State *L) {
  395   const char *fname = luaL_optstring(L, 1, NULL);
  396   lua_settop(L, 1);
  397   if (l_unlikely(luaL_loadfile(L, fname) != LUA_OK))
  398     return lua_error(L);
  399   lua_callk(L, 0, LUA_MULTRET, 0, dofilecont);
  400   return dofilecont(L, 0, 0);
  401 }
  402 
  403 
  404 static int luaB_assert (lua_State *L) {
  405   if (l_likely(lua_toboolean(L, 1)))  /* condition is true? */
  406     return lua_gettop(L);  /* return all arguments */
  407   else {  /* error */
  408     luaL_checkany(L, 1);  /* there must be a condition */
  409     lua_remove(L, 1);  /* remove it */
  410     lua_pushliteral(L, "assertion failed!");  /* default message */
  411     lua_settop(L, 1);  /* leave only message (default if no other one) */
  412     return luaB_error(L);  /* call 'error' */
  413   }
  414 }
  415 
  416 
  417 static int luaB_select (lua_State *L) {
  418   int n = lua_gettop(L);
  419   if (lua_type(L, 1) == LUA_TSTRING && *lua_tostring(L, 1) == '#') {
  420     lua_pushinteger(L, n-1);
  421     return 1;
  422   }
  423   else {
  424     lua_Integer i = luaL_checkinteger(L, 1);
  425     if (i < 0) i = n + i;
  426     else if (i > n) i = n;
  427     luaL_argcheck(L, 1 <= i, 1, "index out of range");
  428     return n - (int)i;
  429   }
  430 }
  431 
  432 
  433 /*
  434 ** Continuation function for 'pcall' and 'xpcall'. Both functions
  435 ** already pushed a 'true' before doing the call, so in case of success
  436 ** 'finishpcall' only has to return everything in the stack minus
  437 ** 'extra' values (where 'extra' is exactly the number of items to be
  438 ** ignored).
  439 */
  440 static int finishpcall (lua_State *L, int status, lua_KContext extra) {
  441   if (l_unlikely(status != LUA_OK && status != LUA_YIELD)) {  /* error? */
  442     lua_pushboolean(L, 0);  /* first result (false) */
  443     lua_pushvalue(L, -2);  /* error message */
  444     return 2;  /* return false, msg */
  445   }
  446   else
  447     return lua_gettop(L) - (int)extra;  /* return all results */
  448 }
  449 
  450 
  451 static int luaB_pcall (lua_State *L) {
  452   int status;
  453   luaL_checkany(L, 1);
  454   lua_pushboolean(L, 1);  /* first result if no errors */
  455   lua_insert(L, 1);  /* put it in place */
  456   status = lua_pcallk(L, lua_gettop(L) - 2, LUA_MULTRET, 0, 0, finishpcall);
  457   return finishpcall(L, status, 0);
  458 }
  459 
  460 
  461 /*
  462 ** Do a protected call with error handling. After 'lua_rotate', the
  463 ** stack will have <f, err, true, f, [args...]>; so, the function passes
  464 ** 2 to 'finishpcall' to skip the 2 first values when returning results.
  465 */
  466 static int luaB_xpcall (lua_State *L) {
  467   int status;
  468   int n = lua_gettop(L);
  469   luaL_checktype(L, 2, LUA_TFUNCTION);  /* check error function */
  470   lua_pushboolean(L, 1);  /* first result */
  471   lua_pushvalue(L, 1);  /* function */
  472   lua_rotate(L, 3, 2);  /* move them below function's arguments */
  473   status = lua_pcallk(L, n - 2, LUA_MULTRET, 2, 2, finishpcall);
  474   return finishpcall(L, status, 2);
  475 }
  476 
  477 
  478 static int luaB_tostring (lua_State *L) {
  479   luaL_checkany(L, 1);
  480   luaL_tolstring(L, 1, NULL);
  481   return 1;
  482 }
  483 
  484 
  485 static const luaL_Reg base_funcs[] = {
  486   {"assert", luaB_assert},
  487   {"collectgarbage", luaB_collectgarbage},
  488   {"dofile", luaB_dofile},
  489   {"error", luaB_error},
  490   {"getmetatable", luaB_getmetatable},
  491   {"ipairs", luaB_ipairs},
  492   {"loadfile", luaB_loadfile},
  493   {"load", luaB_load},
  494   {"next", luaB_next},
  495   {"pairs", luaB_pairs},
  496   {"pcall", luaB_pcall},
  497   {"print", luaB_print},
  498   {"warn", luaB_warn},
  499   {"rawequal", luaB_rawequal},
  500   {"rawlen", luaB_rawlen},
  501   {"rawget", luaB_rawget},
  502   {"rawset", luaB_rawset},
  503   {"select", luaB_select},
  504   {"setmetatable", luaB_setmetatable},
  505   {"tonumber", luaB_tonumber},
  506   {"tostring", luaB_tostring},
  507   {"type", luaB_type},
  508   {"xpcall", luaB_xpcall},
  509   /* placeholders */
  510   {LUA_GNAME, NULL},
  511   {"_VERSION", NULL},
  512   {NULL, NULL}
  513 };
  514 
  515 
  516 LUAMOD_API int luaopen_base (lua_State *L) {
  517   /* open lib into global table */
  518   lua_pushglobaltable(L);
  519   luaL_setfuncs(L, base_funcs, 0);
  520   /* set global _G */
  521   lua_pushvalue(L, -1);
  522   lua_setfield(L, -2, LUA_GNAME);
  523   /* set global _VERSION */
  524   lua_pushliteral(L, LUA_VERSION);
  525   lua_setfield(L, -2, "_VERSION");
  526   return 1;
  527 }
  528