LCOV - code coverage report
Current view: top level - src - lbaselib.c Coverage Total Hit
Test: Lua 5.3.6 Lines: 98.8 % 242 239
Test Date: 2024-04-28 10:23:15
Legend: Lines: hit not hit

            Line data    Source code
       1              : /*
       2              : ** $Id: lbaselib.c,v 1.314.1.1 2017/04/19 17:39:34 roberto Exp $
       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         2204 : static int luaB_print (lua_State *L) {
      25         2204 :   int n = lua_gettop(L);  /* number of arguments */
      26              :   int i;
      27         2204 :   lua_getglobal(L, "tostring");
      28         4411 :   for (i=1; i<=n; i++) {
      29              :     const char *s;
      30              :     size_t l;
      31         2208 :     lua_pushvalue(L, -1);  /* function to be called */
      32         2208 :     lua_pushvalue(L, i);   /* value to print */
      33         2208 :     lua_call(L, 1, 1);
      34         2207 :     s = lua_tolstring(L, -1, &l);  /* get result */
      35         2207 :     if (s == NULL)
      36            0 :       return luaL_error(L, "'tostring' must return a string to 'print'");
      37         2207 :     if (i>1) lua_writestring("\t", 1);
      38         2207 :     lua_writestring(s, l);
      39         2207 :     lua_pop(L, 1);  /* pop result */
      40              :   }
      41         2203 :   lua_writeline();
      42         2203 :   return 0;
      43              : }
      44              : 
      45              : 
      46              : #define SPACECHARS      " \f\n\r\t\v"
      47              : 
      48            3 : static const char *b_str2int (const char *s, int base, lua_Integer *pn) {
      49            3 :   lua_Unsigned n = 0;
      50            3 :   int neg = 0;
      51            3 :   s += strspn(s, SPACECHARS);  /* skip initial spaces */
      52            3 :   if (*s == '-') { s++; neg = 1; }  /* handle signal */
      53            3 :   else if (*s == '+') s++;
      54            3 :   if (!isalnum((unsigned char)*s))  /* no digit? */
      55            0 :     return NULL;
      56              :   do {
      57           27 :     int digit = (isdigit((unsigned char)*s)) ? *s - '0'
      58            9 :                    : (toupper((unsigned char)*s) - 'A') + 10;
      59            9 :     if (digit >= base) return NULL;  /* invalid numeral */
      60            9 :     n = n * base + digit;
      61            9 :     s++;
      62            9 :   } while (isalnum((unsigned char)*s));
      63            3 :   s += strspn(s, SPACECHARS);  /* skip trailing spaces */
      64            3 :   *pn = (lua_Integer)((neg) ? (0u - n) : n);
      65            3 :   return s;
      66              : }
      67              : 
      68              : 
      69          123 : static int luaB_tonumber (lua_State *L) {
      70          123 :   if (lua_isnoneornil(L, 2)) {  /* standard conversion? */
      71          119 :     luaL_checkany(L, 1);
      72          118 :     if (lua_type(L, 1) == LUA_TNUMBER) {  /* already a number? */
      73          103 :       lua_settop(L, 1);  /* yes; return it */
      74          103 :       return 1;
      75              :     }
      76              :     else {
      77              :       size_t l;
      78           15 :       const char *s = lua_tolstring(L, 1, &l);
      79           15 :       if (s != NULL && lua_stringtonumber(L, s) == l + 1)
      80           12 :         return 1;  /* successful conversion to number */
      81              :       /* else not a number */
      82              :     }
      83              :   }
      84              :   else {
      85              :     size_t l;
      86              :     const char *s;
      87            4 :     lua_Integer n = 0;  /* to avoid warnings */
      88            4 :     lua_Integer base = luaL_checkinteger(L, 2);
      89            4 :     luaL_checktype(L, 1, LUA_TSTRING);  /* no numbers as strings */
      90            4 :     s = lua_tolstring(L, 1, &l);
      91            4 :     luaL_argcheck(L, 2 <= base && base <= 36, 2, "base out of range");
      92            3 :     if (b_str2int(s, (int)base, &n) == s + l) {
      93            3 :       lua_pushinteger(L, n);
      94            3 :       return 1;
      95              :     }  /* else not a number */
      96              :   }  /* else not a number */
      97            3 :   lua_pushnil(L);  /* not a number */
      98            3 :   return 1;
      99              : }
     100              : 
     101              : 
     102           22 : static int luaB_error (lua_State *L) {
     103           22 :   int level = (int)luaL_optinteger(L, 2, 1);
     104           22 :   lua_settop(L, 1);
     105           22 :   if (lua_type(L, 1) == LUA_TSTRING && level > 0) {
     106           14 :     luaL_where(L, level);   /* add extra information */
     107           14 :     lua_pushvalue(L, 1);
     108           14 :     lua_concat(L, 2);
     109              :   }
     110           22 :   return lua_error(L);
     111              : }
     112              : 
     113              : 
     114           25 : static int luaB_getmetatable (lua_State *L) {
     115           25 :   luaL_checkany(L, 1);
     116           25 :   if (!lua_getmetatable(L, 1)) {
     117           12 :     lua_pushnil(L);
     118           12 :     return 1;  /* no metatable */
     119              :   }
     120           13 :   luaL_getmetafield(L, 1, "__metatable");
     121           13 :   return 1;  /* returns either __metatable field (if present) or metatable */
     122              : }
     123              : 
     124              : 
     125          100 : static int luaB_setmetatable (lua_State *L) {
     126          100 :   int t = lua_type(L, 2);
     127          100 :   luaL_checktype(L, 1, LUA_TTABLE);
     128           99 :   luaL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2,
     129              :                     "nil or table expected");
     130           97 :   if (luaL_getmetafield(L, 1, "__metatable") != LUA_TNIL)
     131            1 :     return luaL_error(L, "cannot change a protected metatable");
     132           96 :   lua_settop(L, 2);
     133           96 :   lua_setmetatable(L, 1);
     134           96 :   return 1;
     135              : }
     136              : 
     137              : 
     138           17 : static int luaB_rawequal (lua_State *L) {
     139           17 :   luaL_checkany(L, 1);
     140           17 :   luaL_checkany(L, 2);
     141           17 :   lua_pushboolean(L, lua_rawequal(L, 1, 2));
     142           17 :   return 1;
     143              : }
     144              : 
     145              : 
     146            3 : static int luaB_rawlen (lua_State *L) {
     147            3 :   int t = lua_type(L, 1);
     148            3 :   luaL_argcheck(L, t == LUA_TTABLE || t == LUA_TSTRING, 1,
     149              :                    "table or string expected");
     150            2 :   lua_pushinteger(L, lua_rawlen(L, 1));
     151            2 :   return 1;
     152              : }
     153              : 
     154              : 
     155            5 : static int luaB_rawget (lua_State *L) {
     156            5 :   luaL_checktype(L, 1, LUA_TTABLE);
     157            5 :   luaL_checkany(L, 2);
     158            5 :   lua_settop(L, 2);
     159            5 :   lua_rawget(L, 1);
     160            5 :   return 1;
     161              : }
     162              : 
     163            3 : static int luaB_rawset (lua_State *L) {
     164            3 :   luaL_checktype(L, 1, LUA_TTABLE);
     165            3 :   luaL_checkany(L, 2);
     166            3 :   luaL_checkany(L, 3);
     167            3 :   lua_settop(L, 3);
     168            3 :   lua_rawset(L, 1);
     169            2 :   return 1;
     170              : }
     171              : 
     172              : 
     173           13 : static int luaB_collectgarbage (lua_State *L) {
     174              :   static const char *const opts[] = {"stop", "restart", "collect",
     175              :     "count", "step", "setpause", "setstepmul",
     176              :     "isrunning", NULL};
     177              :   static const int optsnum[] = {LUA_GCSTOP, LUA_GCRESTART, LUA_GCCOLLECT,
     178              :     LUA_GCCOUNT, LUA_GCSTEP, LUA_GCSETPAUSE, LUA_GCSETSTEPMUL,
     179              :     LUA_GCISRUNNING};
     180           13 :   int o = optsnum[luaL_checkoption(L, 1, "collect", opts)];
     181           12 :   int ex = (int)luaL_optinteger(L, 2, 0);
     182           12 :   int res = lua_gc(L, o, ex);
     183           12 :   switch (o) {
     184            1 :     case LUA_GCCOUNT: {
     185            1 :       int b = lua_gc(L, LUA_GCCOUNTB, 0);
     186            1 :       lua_pushnumber(L, (lua_Number)res + ((lua_Number)b/1024));
     187            1 :       return 1;
     188              :     }
     189            5 :     case LUA_GCSTEP: case LUA_GCISRUNNING: {
     190            5 :       lua_pushboolean(L, res);
     191            5 :       return 1;
     192              :     }
     193            6 :     default: {
     194            6 :       lua_pushinteger(L, res);
     195            6 :       return 1;
     196              :     }
     197              :   }
     198              : }
     199              : 
     200              : 
     201          153 : static int luaB_type (lua_State *L) {
     202          153 :   int t = lua_type(L, 1);
     203          153 :   luaL_argcheck(L, t != LUA_TNONE, 1, "value expected");
     204          152 :   lua_pushstring(L, lua_typename(L, t));
     205          152 :   return 1;
     206              : }
     207              : 
     208              : 
     209         5934 : static int pairsmeta (lua_State *L, const char *method, int iszero,
     210              :                       lua_CFunction iter) {
     211         5934 :   luaL_checkany(L, 1);
     212         5934 :   if (luaL_getmetafield(L, 1, method) == LUA_TNIL) {  /* no metamethod? */
     213         5932 :     lua_pushcfunction(L, iter);  /* will return generator, */
     214         5932 :     lua_pushvalue(L, 1);  /* state, */
     215         5932 :     if (iszero) lua_pushinteger(L, 0);  /* and initial value */
     216            6 :     else lua_pushnil(L);
     217              :   }
     218              :   else {
     219            2 :     lua_pushvalue(L, 1);  /* argument 'self' to metamethod */
     220            2 :     lua_call(L, 1, 3);  /* get 3 values from metamethod */
     221              :   }
     222         5934 :   return 3;
     223              : }
     224              : 
     225              : 
     226           45 : static int luaB_next (lua_State *L) {
     227           45 :   luaL_checktype(L, 1, LUA_TTABLE);
     228           44 :   lua_settop(L, 2);  /* create a 2nd argument if there isn't one */
     229           44 :   if (lua_next(L, 1))
     230           31 :     return 2;
     231              :   else {
     232           12 :     lua_pushnil(L);
     233           12 :     return 1;
     234              :   }
     235              : }
     236              : 
     237              : 
     238            7 : static int luaB_pairs (lua_State *L) {
     239            7 :   return pairsmeta(L, "__pairs", 0, luaB_next);
     240              : }
     241              : 
     242              : 
     243              : /*
     244              : ** Traversal function for 'ipairs'
     245              : */
     246        46287 : static int ipairsaux (lua_State *L) {
     247        46287 :   lua_Integer i = luaL_checkinteger(L, 2) + 1;
     248        46287 :   lua_pushinteger(L, i);
     249        46287 :   return (lua_geti(L, 1, i) == LUA_TNIL) ? 1 : 2;
     250              : }
     251              : 
     252              : 
     253              : /*
     254              : ** 'ipairs' function. Returns 'ipairsaux', given "table", 0.
     255              : ** (The given "table" may not be a table.)
     256              : */
     257         5927 : static int luaB_ipairs (lua_State *L) {
     258              : #if defined(LUA_COMPAT_IPAIRS)
     259         5927 :   return pairsmeta(L, "__ipairs", 1, ipairsaux);
     260              : #else
     261              :   luaL_checkany(L, 1);
     262              :   lua_pushcfunction(L, ipairsaux);  /* iteration function */
     263              :   lua_pushvalue(L, 1);  /* state */
     264              :   lua_pushinteger(L, 0);  /* initial value */
     265              :   return 3;
     266              : #endif
     267              : }
     268              : 
     269              : 
     270          223 : static int load_aux (lua_State *L, int status, int envidx) {
     271          223 :   if (status == LUA_OK) {
     272          180 :     if (envidx != 0) {  /* 'env' parameter? */
     273            2 :       lua_pushvalue(L, envidx);  /* environment for loaded function */
     274            2 :       if (!lua_setupvalue(L, -2, 1))  /* set it as 1st upvalue */
     275            0 :         lua_pop(L, 1);  /* remove 'env' if not used by previous call */
     276              :     }
     277          180 :     return 1;
     278              :   }
     279              :   else {  /* error (message is on top of the stack) */
     280           43 :     lua_pushnil(L);
     281           43 :     lua_insert(L, -2);  /* put before error message */
     282           43 :     return 2;  /* return nil plus error message */
     283              :   }
     284              : }
     285              : 
     286              : 
     287            6 : static int luaB_loadfile (lua_State *L) {
     288            6 :   const char *fname = luaL_optstring(L, 1, NULL);
     289            6 :   const char *mode = luaL_optstring(L, 2, NULL);
     290            6 :   int env = (!lua_isnone(L, 3) ? 3 : 0);  /* 'env' index or 0 if no 'env' */
     291            6 :   int status = luaL_loadfilex(L, fname, mode);
     292            6 :   return load_aux(L, status, env);
     293              : }
     294              : 
     295              : 
     296              : /*
     297              : ** {======================================================
     298              : ** Generic Read function
     299              : ** =======================================================
     300              : */
     301              : 
     302              : 
     303              : /*
     304              : ** reserved slot, above all arguments, to hold a copy of the returned
     305              : ** string to avoid it being collected while parsed. 'load' has four
     306              : ** optional arguments (chunk, source name, mode, and environment).
     307              : */
     308              : #define RESERVEDSLOT    5
     309              : 
     310              : 
     311              : /*
     312              : ** Reader for generic 'load' function: 'lua_load' uses the
     313              : ** stack for internal stuff, so the reader cannot change the
     314              : ** stack top. Instead, it keeps its resulting string in a
     315              : ** reserved slot inside the stack.
     316              : */
     317            6 : static const char *generic_reader (lua_State *L, void *ud, size_t *size) {
     318              :   (void)(ud);  /* not used */
     319            6 :   luaL_checkstack(L, 2, "too many nested functions");
     320            6 :   lua_pushvalue(L, 1);  /* get function */
     321            6 :   lua_call(L, 0, 1);  /* call it */
     322            6 :   if (lua_isnil(L, -1)) {
     323            3 :     lua_pop(L, 1);  /* pop result */
     324            3 :     *size = 0;
     325            3 :     return NULL;
     326              :   }
     327            3 :   else if (!lua_isstring(L, -1))
     328            1 :     luaL_error(L, "reader function must return a string");
     329            2 :   lua_replace(L, RESERVEDSLOT);  /* save string in reserved slot */
     330            2 :   return lua_tolstring(L, RESERVEDSLOT, size);
     331              : }
     332              : 
     333              : 
     334          217 : static int luaB_load (lua_State *L) {
     335              :   int status;
     336              :   size_t l;
     337          217 :   const char *s = lua_tolstring(L, 1, &l);
     338          217 :   const char *mode = luaL_optstring(L, 3, "bt");
     339          217 :   int env = (!lua_isnone(L, 4) ? 4 : 0);  /* 'env' index or 0 if no 'env' */
     340          217 :   if (s != NULL) {  /* loading a string? */
     341          212 :     const char *chunkname = luaL_optstring(L, 2, s);
     342          212 :     status = luaL_loadbufferx(L, s, l, chunkname, mode);
     343              :   }
     344              :   else {  /* loading from a reader function */
     345            5 :     const char *chunkname = luaL_optstring(L, 2, "=(load)");
     346            5 :     luaL_checktype(L, 1, LUA_TFUNCTION);
     347            5 :     lua_settop(L, RESERVEDSLOT);  /* create reserved slot */
     348            5 :     status = lua_load(L, generic_reader, NULL, chunkname, mode);
     349              :   }
     350          217 :   return load_aux(L, status, env);
     351              : }
     352              : 
     353              : /* }====================================================== */
     354              : 
     355              : 
     356           13 : static int dofilecont (lua_State *L, int d1, lua_KContext d2) {
     357              :   (void)d1;  (void)d2;  /* only to match 'lua_Kfunction' prototype */
     358           13 :   return lua_gettop(L) - 1;
     359              : }
     360              : 
     361              : 
     362           15 : static int luaB_dofile (lua_State *L) {
     363           15 :   const char *fname = luaL_optstring(L, 1, NULL);
     364           15 :   lua_settop(L, 1);
     365           15 :   if (luaL_loadfile(L, fname) != LUA_OK)
     366            2 :     return lua_error(L);
     367           13 :   lua_callk(L, 0, LUA_MULTRET, 0, dofilecont);
     368           13 :   return dofilecont(L, 0, 0);
     369              : }
     370              : 
     371              : 
     372         5929 : static int luaB_assert (lua_State *L) {
     373         5929 :   if (lua_toboolean(L, 1))  /* condition is true? */
     374         5919 :     return lua_gettop(L);  /* return all arguments */
     375              :   else {  /* error */
     376           10 :     luaL_checkany(L, 1);  /* there must be a condition */
     377            9 :     lua_remove(L, 1);  /* remove it */
     378            9 :     lua_pushliteral(L, "assertion failed!");  /* default message */
     379            9 :     lua_settop(L, 1);  /* leave only message (default if no other one) */
     380            9 :     return luaB_error(L);  /* call 'error' */
     381              :   }
     382              : }
     383              : 
     384              : 
     385           12 : static int luaB_select (lua_State *L) {
     386           12 :   int n = lua_gettop(L);
     387           12 :   if (lua_type(L, 1) == LUA_TSTRING && *lua_tostring(L, 1) == '#') {
     388            2 :     lua_pushinteger(L, n-1);
     389            2 :     return 1;
     390              :   }
     391              :   else {
     392           10 :     lua_Integer i = luaL_checkinteger(L, 1);
     393           10 :     if (i < 0) i = n + i;
     394            6 :     else if (i > n) i = n;
     395           10 :     luaL_argcheck(L, 1 <= i, 1, "index out of range");
     396            8 :     return n - (int)i;
     397              :   }
     398              : }
     399              : 
     400              : 
     401              : /*
     402              : ** Continuation function for 'pcall' and 'xpcall'. Both functions
     403              : ** already pushed a 'true' before doing the call, so in case of success
     404              : ** 'finishpcall' only has to return everything in the stack minus
     405              : ** 'extra' values (where 'extra' is exactly the number of items to be
     406              : ** ignored).
     407              : */
     408          632 : static int finishpcall (lua_State *L, int status, lua_KContext extra) {
     409          632 :   if (status != LUA_OK && status != LUA_YIELD) {  /* error? */
     410          459 :     lua_pushboolean(L, 0);  /* first result (false) */
     411          459 :     lua_pushvalue(L, -2);  /* error message */
     412          459 :     return 2;  /* return false, msg */
     413              :   }
     414              :   else
     415          173 :     return lua_gettop(L) - (int)extra;  /* return all results */
     416              : }
     417              : 
     418              : 
     419          625 : static int luaB_pcall (lua_State *L) {
     420              :   int status;
     421          625 :   luaL_checkany(L, 1);
     422          625 :   lua_pushboolean(L, 1);  /* first result if no errors */
     423          625 :   lua_insert(L, 1);  /* put it in place */
     424          625 :   status = lua_pcallk(L, lua_gettop(L) - 2, LUA_MULTRET, 0, 0, finishpcall);
     425          624 :   return finishpcall(L, status, 0);
     426              : }
     427              : 
     428              : 
     429              : /*
     430              : ** Do a protected call with error handling. After 'lua_rotate', the
     431              : ** stack will have <f, err, true, f, [args...]>; so, the function passes
     432              : ** 2 to 'finishpcall' to skip the 2 first values when returning results.
     433              : */
     434            9 : static int luaB_xpcall (lua_State *L) {
     435              :   int status;
     436            9 :   int n = lua_gettop(L);
     437            9 :   luaL_checktype(L, 2, LUA_TFUNCTION);  /* check error function */
     438            7 :   lua_pushboolean(L, 1);  /* first result */
     439            7 :   lua_pushvalue(L, 1);  /* function */
     440            7 :   lua_rotate(L, 3, 2);  /* move them below function's arguments */
     441            7 :   status = lua_pcallk(L, n - 2, LUA_MULTRET, 2, 2, finishpcall);
     442            6 :   return finishpcall(L, status, 2);
     443              : }
     444              : 
     445              : 
     446         5053 : static int luaB_tostring (lua_State *L) {
     447         5053 :   luaL_checkany(L, 1);
     448         5052 :   luaL_tolstring(L, 1, NULL);
     449         5049 :   return 1;
     450              : }
     451              : 
     452              : 
     453              : static const luaL_Reg base_funcs[] = {
     454              :   {"assert", luaB_assert},
     455              :   {"collectgarbage", luaB_collectgarbage},
     456              :   {"dofile", luaB_dofile},
     457              :   {"error", luaB_error},
     458              :   {"getmetatable", luaB_getmetatable},
     459              :   {"ipairs", luaB_ipairs},
     460              :   {"loadfile", luaB_loadfile},
     461              :   {"load", luaB_load},
     462              : #if defined(LUA_COMPAT_LOADSTRING)
     463              :   {"loadstring", luaB_load},
     464              : #endif
     465              :   {"next", luaB_next},
     466              :   {"pairs", luaB_pairs},
     467              :   {"pcall", luaB_pcall},
     468              :   {"print", luaB_print},
     469              :   {"rawequal", luaB_rawequal},
     470              :   {"rawlen", luaB_rawlen},
     471              :   {"rawget", luaB_rawget},
     472              :   {"rawset", luaB_rawset},
     473              :   {"select", luaB_select},
     474              :   {"setmetatable", luaB_setmetatable},
     475              :   {"tonumber", luaB_tonumber},
     476              :   {"tostring", luaB_tostring},
     477              :   {"type", luaB_type},
     478              :   {"xpcall", luaB_xpcall},
     479              :   /* placeholders */
     480              :   {"_G", NULL},
     481              :   {"_VERSION", NULL},
     482              :   {NULL, NULL}
     483              : };
     484              : 
     485              : 
     486           86 : LUAMOD_API int luaopen_base (lua_State *L) {
     487              :   /* open lib into global table */
     488           86 :   lua_pushglobaltable(L);
     489           86 :   luaL_setfuncs(L, base_funcs, 0);
     490              :   /* set global _G */
     491           86 :   lua_pushvalue(L, -1);
     492           86 :   lua_setfield(L, -2, "_G");
     493              :   /* set global _VERSION */
     494           86 :   lua_pushliteral(L, LUA_VERSION);
     495           86 :   lua_setfield(L, -2, "_VERSION");
     496           86 :   return 1;
     497              : }
     498              : 
        

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