FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/module/lua/lauxlib.c

     /*
     ** $Id: lauxlib.c,v 1.248.1.1 2013/04/12 18:48:47 roberto Exp $
     ** Auxiliary functions for building Lua libraries
     ** See Copyright Notice in lua.h
     */
     
     
     /* This file uses only the official API of Lua.
     ** Any function declared here could be written as an application function.
    */
    
    #define lauxlib_c
    #define LUA_LIB
    
    #include <sys/lua/lua.h>
    
    #include <sys/lua/lauxlib.h>
    
    
    /*
    ** {======================================================
    ** Traceback
    ** =======================================================
    */
    
    
    #define LEVELS1 12      /* size of the first part of the stack */
    #define LEVELS2 10      /* size of the second part of the stack */
    
    
    
    /*
    ** search for 'objidx' in table at index -1.
    ** return 1 + string at top if find a good name.
    */
    static int findfield (lua_State *L, int objidx, int level) {
      if (level == 0 || !lua_istable(L, -1))
        return 0;  /* not found */
      lua_pushnil(L);  /* start 'next' loop */
      while (lua_next(L, -2)) {  /* for each pair in table */
        if (lua_type(L, -2) == LUA_TSTRING) {  /* ignore non-string keys */
          if (lua_rawequal(L, objidx, -1)) {  /* found object? */
            lua_pop(L, 1);  /* remove value (but keep name) */
            return 1;
          }
          else if (findfield(L, objidx, level - 1)) {  /* try recursively */
            lua_remove(L, -2);  /* remove table (but keep name) */
            lua_pushliteral(L, ".");
            lua_insert(L, -2);  /* place '.' between the two names */
            lua_concat(L, 3);
            return 1;
          }
        }
        lua_pop(L, 1);  /* remove value */
      }
      return 0;  /* not found */
    }
    
    
    static int pushglobalfuncname (lua_State *L, lua_Debug *ar) {
      int top = lua_gettop(L);
      lua_getinfo(L, "f", ar);  /* push function */
      lua_pushglobaltable(L);
      if (findfield(L, top + 1, 2)) {
        lua_copy(L, -1, top + 1);  /* move name to proper place */
        lua_pop(L, 2);  /* remove pushed values */
        return 1;
      }
      else {
        lua_settop(L, top);  /* remove function and global table */
        return 0;
      }
    }
    
    
    static void pushfuncname (lua_State *L, lua_Debug *ar) {
      if (*ar->namewhat != '\0')  /* is there a name? */
        lua_pushfstring(L, "function " LUA_QS, ar->name);
      else if (*ar->what == 'm')  /* main? */
          lua_pushliteral(L, "main chunk");
      else if (*ar->what == 'C') {
        if (pushglobalfuncname(L, ar)) {
          lua_pushfstring(L, "function " LUA_QS, lua_tostring(L, -1));
          lua_remove(L, -2);  /* remove name */
        }
        else
          lua_pushliteral(L, "?");
      }
      else
        lua_pushfstring(L, "function <%s:%d>", ar->short_src, ar->linedefined);
    }
    
    
    static int countlevels (lua_State *L) {
      lua_Debug ar;
      int li = 1, le = 1;
      /* find an upper bound */
      while (lua_getstack(L, le, &ar)) { li = le; le *= 2; }
      /* do a binary search */
     while (li < le) {
       int m = (li + le)/2;
       if (lua_getstack(L, m, &ar)) li = m + 1;
       else le = m;
     }
     return le - 1;
   }
   
   
   LUALIB_API void luaL_traceback (lua_State *L, lua_State *L1,
                                   const char *msg, int level) {
     lua_Debug ar;
     int top = lua_gettop(L);
     int numlevels = countlevels(L1);
     int mark = (numlevels > LEVELS1 + LEVELS2) ? LEVELS1 : 0;
     if (msg) lua_pushfstring(L, "%s\n", msg);
     lua_pushliteral(L, "stack traceback:");
     while (lua_getstack(L1, level++, &ar)) {
       if (level == mark) {  /* too many levels? */
         lua_pushliteral(L, "\n\t...");  /* add a '...' */
         level = numlevels - LEVELS2;  /* and skip to last ones */
       }
       else {
         lua_getinfo(L1, "Slnt", &ar);
         lua_pushfstring(L, "\n\t%s:", ar.short_src);
         if (ar.currentline > 0)
           lua_pushfstring(L, "%d:", ar.currentline);
         lua_pushliteral(L, " in ");
         pushfuncname(L, &ar);
         if (ar.istailcall)
           lua_pushliteral(L, "\n\t(...tail calls...)");
         lua_concat(L, lua_gettop(L) - top);
       }
     }
     lua_concat(L, lua_gettop(L) - top);
   }
   
   /* }====================================================== */
   
   
   /*
   ** {======================================================
   ** Error-report functions
   ** =======================================================
   */
   
   LUALIB_API int luaL_argerror (lua_State *L, int narg, const char *extramsg) {
     lua_Debug ar;
     if (!lua_getstack(L, 0, &ar))  /* no stack frame? */
       return luaL_error(L, "bad argument #%d (%s)", narg, extramsg);
     lua_getinfo(L, "n", &ar);
     if (strcmp(ar.namewhat, "method") == 0) {
       narg--;  /* do not count `self' */
       if (narg == 0)  /* error is in the self argument itself? */
         return luaL_error(L, "calling " LUA_QS " on bad self (%s)",
                              ar.name, extramsg);
     }
     if (ar.name == NULL)
       ar.name = (pushglobalfuncname(L, &ar)) ? lua_tostring(L, -1) : "?";
     return luaL_error(L, "bad argument #%d to " LUA_QS " (%s)",
                           narg, ar.name, extramsg);
   }
   
   
   static int typeerror (lua_State *L, int narg, const char *tname) {
     const char *msg = lua_pushfstring(L, "%s expected, got %s",
                                       tname, luaL_typename(L, narg));
     return luaL_argerror(L, narg, msg);
   }
   
   
   static void tag_error (lua_State *L, int narg, int tag) {
     typeerror(L, narg, lua_typename(L, tag));
   }
   
   
   LUALIB_API void luaL_where (lua_State *L, int level) {
     lua_Debug ar;
     if (lua_getstack(L, level, &ar)) {  /* check function at level */
       lua_getinfo(L, "Sl", &ar);  /* get info about it */
       if (ar.currentline > 0) {  /* is there info? */
         lua_pushfstring(L, "%s:%d: ", ar.short_src, ar.currentline);
         return;
       }
     }
     lua_pushliteral(L, "");  /* else, no information available... */
   }
   
   
   LUALIB_API int luaL_error (lua_State *L, const char *fmt, ...) {
     va_list argp;
     va_start(argp, fmt);
     luaL_where(L, 1);
     lua_pushvfstring(L, fmt, argp);
     va_end(argp);
     lua_concat(L, 2);
     return lua_error(L);
   }
   
   
   #if !defined(inspectstat)       /* { */
   
   #if defined(LUA_USE_POSIX)
   
   #include <sys/wait.h>
   
   /*
   ** use appropriate macros to interpret 'pclose' return status
   */
   #define inspectstat(stat,what)  \
      if (WIFEXITED(stat)) { stat = WEXITSTATUS(stat); } \
      else if (WIFSIGNALED(stat)) { stat = WTERMSIG(stat); what = "signal"; }
   
   #else
   
   #define inspectstat(stat,what)  /* no op */
   
   #endif
   
   #endif                          /* } */
   
   
   /* }====================================================== */
   
   
   /*
   ** {======================================================
   ** Userdata's metatable manipulation
   ** =======================================================
   */
   
   LUALIB_API int luaL_newmetatable (lua_State *L, const char *tname) {
     luaL_getmetatable(L, tname);  /* try to get metatable */
     if (!lua_isnil(L, -1))  /* name already in use? */
       return 0;  /* leave previous value on top, but return 0 */
     lua_pop(L, 1);
     lua_newtable(L);  /* create metatable */
     lua_pushvalue(L, -1);
     lua_setfield(L, LUA_REGISTRYINDEX, tname);  /* registry.name = metatable */
     return 1;
   }
   
   
   LUALIB_API void luaL_setmetatable (lua_State *L, const char *tname) {
     luaL_getmetatable(L, tname);
     lua_setmetatable(L, -2);
   }
   
   
   LUALIB_API void *luaL_testudata (lua_State *L, int ud, const char *tname) {
     void *p = lua_touserdata(L, ud);
     if (p != NULL) {  /* value is a userdata? */
       if (lua_getmetatable(L, ud)) {  /* does it have a metatable? */
         luaL_getmetatable(L, tname);  /* get correct metatable */
         if (!lua_rawequal(L, -1, -2))  /* not the same? */
           p = NULL;  /* value is a userdata with wrong metatable */
         lua_pop(L, 2);  /* remove both metatables */
         return p;
       }
     }
     return NULL;  /* value is not a userdata with a metatable */
   }
   
   
   LUALIB_API void *luaL_checkudata (lua_State *L, int ud, const char *tname) {
     void *p = luaL_testudata(L, ud, tname);
     if (p == NULL) typeerror(L, ud, tname);
     return p;
   }
   
   /* }====================================================== */
   
   
   /*
   ** {======================================================
   ** Argument check functions
   ** =======================================================
   */
   
   LUALIB_API int luaL_checkoption (lua_State *L, int narg, const char *def,
                                    const char *const lst[]) {
     const char *name = (def) ? luaL_optstring(L, narg, def) :
                                luaL_checkstring(L, narg);
     int i;
     for (i=0; lst[i]; i++)
       if (strcmp(lst[i], name) == 0)
         return i;
     return luaL_argerror(L, narg,
                          lua_pushfstring(L, "invalid option " LUA_QS, name));
   }
   
   
   LUALIB_API void luaL_checkstack (lua_State *L, int space, const char *msg) {
     /* keep some extra space to run error routines, if needed */
     const int extra = LUA_MINSTACK;
     if (!lua_checkstack(L, space + extra)) {
       if (msg)
         luaL_error(L, "stack overflow (%s)", msg);
       else
         luaL_error(L, "stack overflow");
     }
   }
   
   
   LUALIB_API void luaL_checktype (lua_State *L, int narg, int t) {
     if (lua_type(L, narg) != t)
       tag_error(L, narg, t);
   }
   
   
   LUALIB_API void luaL_checkany (lua_State *L, int narg) {
     if (lua_type(L, narg) == LUA_TNONE)
       luaL_argerror(L, narg, "value expected");
   }
   
   
   LUALIB_API const char *luaL_checklstring (lua_State *L, int narg, size_t *len) {
     const char *s = lua_tolstring(L, narg, len);
     if (!s) tag_error(L, narg, LUA_TSTRING);
     return s;
   }
   
   
   LUALIB_API const char *luaL_optlstring (lua_State *L, int narg,
                                           const char *def, size_t *len) {
     if (lua_isnoneornil(L, narg)) {
       if (len)
         *len = (def ? strlen(def) : 0);
       return def;
     }
     else return luaL_checklstring(L, narg, len);
   }
   
   
   LUALIB_API lua_Number luaL_checknumber (lua_State *L, int narg) {
     int isnum;
     lua_Number d = lua_tonumberx(L, narg, &isnum);
     if (!isnum)
       tag_error(L, narg, LUA_TNUMBER);
     return d;
   }
   
   
   LUALIB_API lua_Number luaL_optnumber (lua_State *L, int narg, lua_Number def) {
     return luaL_opt(L, luaL_checknumber, narg, def);
   }
   
   
   LUALIB_API lua_Integer luaL_checkinteger (lua_State *L, int narg) {
     int isnum;
     lua_Integer d = lua_tointegerx(L, narg, &isnum);
     if (!isnum)
       tag_error(L, narg, LUA_TNUMBER);
     return d;
   }
   
   
   LUALIB_API lua_Unsigned luaL_checkunsigned (lua_State *L, int narg) {
     int isnum;
     lua_Unsigned d = lua_tounsignedx(L, narg, &isnum);
     if (!isnum)
       tag_error(L, narg, LUA_TNUMBER);
     return d;
   }
   
   
   LUALIB_API lua_Integer luaL_optinteger (lua_State *L, int narg,
                                                         lua_Integer def) {
     return luaL_opt(L, luaL_checkinteger, narg, def);
   }
   
   
   LUALIB_API lua_Unsigned luaL_optunsigned (lua_State *L, int narg,
                                                           lua_Unsigned def) {
     return luaL_opt(L, luaL_checkunsigned, narg, def);
   }
   
   /* }====================================================== */
   
   
   /*
   ** {======================================================
   ** Generic Buffer manipulation
   ** =======================================================
   */
   
   /*
   ** check whether buffer is using a userdata on the stack as a temporary
   ** buffer
   */
   #define buffonstack(B)  ((B)->b != (B)->initb)
   
   
   /*
   ** returns a pointer to a free area with at least 'sz' bytes
   */
   LUALIB_API char *luaL_prepbuffsize (luaL_Buffer *B, size_t sz) {
     lua_State *L = B->L;
     if (B->size - B->n < sz) {  /* not enough space? */
       char *newbuff;
       size_t newsize = B->size * 2;  /* double buffer size */
       if (newsize - B->n < sz)  /* not big enough? */
         newsize = B->n + sz;
       if (newsize < B->n || newsize - B->n < sz)
         luaL_error(L, "buffer too large");
       /* create larger buffer */
       newbuff = (char *)lua_newuserdata(L, newsize * sizeof(char));
       /* move content to new buffer */
       memcpy(newbuff, B->b, B->n * sizeof(char));
       if (buffonstack(B))
         lua_remove(L, -2);  /* remove old buffer */
       B->b = newbuff;
       B->size = newsize;
     }
     return &B->b[B->n];
   }
   
   
   LUALIB_API void luaL_addlstring (luaL_Buffer *B, const char *s, size_t l) {
     char *b = luaL_prepbuffsize(B, l);
     memcpy(b, s, l * sizeof(char));
     luaL_addsize(B, l);
   }
   
   
   LUALIB_API void luaL_addstring (luaL_Buffer *B, const char *s) {
     luaL_addlstring(B, s, strlen(s));
   }
   
   
   LUALIB_API void luaL_pushresult (luaL_Buffer *B) {
     lua_State *L = B->L;
     lua_pushlstring(L, B->b, B->n);
     if (buffonstack(B))
       lua_remove(L, -2);  /* remove old buffer */
   }
   
   
   LUALIB_API void luaL_pushresultsize (luaL_Buffer *B, size_t sz) {
     luaL_addsize(B, sz);
     luaL_pushresult(B);
   }
   
   
   LUALIB_API void luaL_addvalue (luaL_Buffer *B) {
     lua_State *L = B->L;
     size_t l;
     const char *s = lua_tolstring(L, -1, &l);
     if (buffonstack(B))
       lua_insert(L, -2);  /* put value below buffer */
     luaL_addlstring(B, s, l);
     lua_remove(L, (buffonstack(B)) ? -2 : -1);  /* remove value */
   }
   
   
   LUALIB_API void luaL_buffinit (lua_State *L, luaL_Buffer *B) {
     B->L = L;
     B->b = B->initb;
     B->n = 0;
     B->size = LUAL_BUFFERSIZE;
   }
   
   
   LUALIB_API char *luaL_buffinitsize (lua_State *L, luaL_Buffer *B, size_t sz) {
     luaL_buffinit(L, B);
     return luaL_prepbuffsize(B, sz);
   }
   
   /* }====================================================== */
   
   
   /*
   ** {======================================================
   ** Reference system
   ** =======================================================
   */
   
   /* index of free-list header */
   #define freelist        0
   
   
   LUALIB_API int luaL_ref (lua_State *L, int t) {
     int ref;
     if (lua_isnil(L, -1)) {
       lua_pop(L, 1);  /* remove from stack */
       return LUA_REFNIL;  /* `nil' has a unique fixed reference */
     }
     t = lua_absindex(L, t);
     lua_rawgeti(L, t, freelist);  /* get first free element */
     ref = (int)lua_tointeger(L, -1);  /* ref = t[freelist] */
     lua_pop(L, 1);  /* remove it from stack */
     if (ref != 0) {  /* any free element? */
       lua_rawgeti(L, t, ref);  /* remove it from list */
       lua_rawseti(L, t, freelist);  /* (t[freelist] = t[ref]) */
     }
     else  /* no free elements */
       ref = (int)lua_rawlen(L, t) + 1;  /* get a new reference */
     lua_rawseti(L, t, ref);
     return ref;
   }
   
   
   LUALIB_API void luaL_unref (lua_State *L, int t, int ref) {
     if (ref >= 0) {
       t = lua_absindex(L, t);
       lua_rawgeti(L, t, freelist);
       lua_rawseti(L, t, ref);  /* t[ref] = t[freelist] */
       lua_pushinteger(L, ref);
       lua_rawseti(L, t, freelist);  /* t[freelist] = ref */
     }
   }
   
   /* }====================================================== */
   
   
   /*
   ** {======================================================
   ** Load functions
   ** =======================================================
   */
   
   typedef struct LoadS {
     const char *s;
     size_t size;
   } LoadS;
   
   
   static const char *getS (lua_State *L, void *ud, size_t *size) {
     LoadS *ls = (LoadS *)ud;
     (void)L;  /* not used */
     if (ls->size == 0) return NULL;
     *size = ls->size;
     ls->size = 0;
     return ls->s;
   }
   
   
   LUALIB_API int luaL_loadbufferx (lua_State *L, const char *buff, size_t size,
                                    const char *name, const char *mode) {
     LoadS ls;
     ls.s = buff;
     ls.size = size;
     return lua_load(L, getS, &ls, name, mode);
   }
   
   
   LUALIB_API int luaL_loadstring (lua_State *L, const char *s) {
     return luaL_loadbuffer(L, s, strlen(s), s);
   }
   
   /* }====================================================== */
   
   
   
   LUALIB_API int luaL_getmetafield (lua_State *L, int obj, const char *event) {
     if (!lua_getmetatable(L, obj))  /* no metatable? */
       return 0;
     lua_pushstring(L, event);
     lua_rawget(L, -2);
     if (lua_isnil(L, -1)) {
       lua_pop(L, 2);  /* remove metatable and metafield */
       return 0;
     }
     else {
       lua_remove(L, -2);  /* remove only metatable */
       return 1;
     }
   }
   
   
   LUALIB_API int luaL_callmeta (lua_State *L, int obj, const char *event) {
     obj = lua_absindex(L, obj);
     if (!luaL_getmetafield(L, obj, event))  /* no metafield? */
       return 0;
     lua_pushvalue(L, obj);
     lua_call(L, 1, 1);
     return 1;
   }
   
   
   LUALIB_API int luaL_len (lua_State *L, int idx) {
     int l;
     int isnum;
     lua_len(L, idx);
     l = (int)lua_tointegerx(L, -1, &isnum);
     if (!isnum)
       luaL_error(L, "object length is not a number");
     lua_pop(L, 1);  /* remove object */
     return l;
   }
   
   
   LUALIB_API const char *luaL_tolstring (lua_State *L, int idx, size_t *len) {
     if (!luaL_callmeta(L, idx, "__tostring")) {  /* no metafield? */
       switch (lua_type(L, idx)) {
         case LUA_TNUMBER:
         case LUA_TSTRING:
           lua_pushvalue(L, idx);
           break;
         case LUA_TBOOLEAN:
           lua_pushstring(L, (lua_toboolean(L, idx) ? "true" : "false"));
           break;
         case LUA_TNIL:
           lua_pushliteral(L, "nil");
           break;
         default:
           lua_pushfstring(L, "%s: %p", luaL_typename(L, idx),
                                               lua_topointer(L, idx));
           break;
       }
     }
     return lua_tolstring(L, -1, len);
   }
   
   
   /*
   ** {======================================================
   ** Compatibility with 5.1 module functions
   ** =======================================================
   */
   #if defined(LUA_COMPAT_MODULE)
   
   static const char *luaL_findtable (lua_State *L, int idx,
                                      const char *fname, int szhint) {
     const char *e;
     if (idx) lua_pushvalue(L, idx);
     do {
       e = strchr(fname, '.');
       if (e == NULL) e = fname + strlen(fname);
       lua_pushlstring(L, fname, e - fname);
       lua_rawget(L, -2);
       if (lua_isnil(L, -1)) {  /* no such field? */
         lua_pop(L, 1);  /* remove this nil */
         lua_createtable(L, 0, (*e == '.' ? 1 : szhint)); /* new table for field */
         lua_pushlstring(L, fname, e - fname);
         lua_pushvalue(L, -2);
         lua_settable(L, -4);  /* set new table into field */
       }
       else if (!lua_istable(L, -1)) {  /* field has a non-table value? */
         lua_pop(L, 2);  /* remove table and value */
         return fname;  /* return problematic part of the name */
       }
       lua_remove(L, -2);  /* remove previous table */
       fname = e + 1;
     } while (*e == '.');
     return NULL;
   }
   
   
   /*
   ** Count number of elements in a luaL_Reg list.
   */
   static int libsize (const luaL_Reg *l) {
     int size = 0;
     for (; l && l->name; l++) size++;
     return size;
   }
   
   
   /*
   ** Find or create a module table with a given name. The function
   ** first looks at the _LOADED table and, if that fails, try a
   ** global variable with that name. In any case, leaves on the stack
   ** the module table.
   */
   LUALIB_API void luaL_pushmodule (lua_State *L, const char *modname,
                                    int sizehint) {
     luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 1);  /* get _LOADED table */
     lua_getfield(L, -1, modname);  /* get _LOADED[modname] */
     if (!lua_istable(L, -1)) {  /* not found? */
       lua_pop(L, 1);  /* remove previous result */
       /* try global variable (and create one if it does not exist) */
       lua_pushglobaltable(L);
       if (luaL_findtable(L, 0, modname, sizehint) != NULL)
         luaL_error(L, "name conflict for module " LUA_QS, modname);
       lua_pushvalue(L, -1);
       lua_setfield(L, -3, modname);  /* _LOADED[modname] = new table */
     }
     lua_remove(L, -2);  /* remove _LOADED table */
   }
   
   
   LUALIB_API void luaL_openlib (lua_State *L, const char *libname,
                                  const luaL_Reg *l, int nup) {
     luaL_checkversion(L);
     if (libname) {
       luaL_pushmodule(L, libname, libsize(l));  /* get/create library table */
       lua_insert(L, -(nup + 1));  /* move library table to below upvalues */
     }
     if (l)
       luaL_setfuncs(L, l, nup);
     else
       lua_pop(L, nup);  /* remove upvalues */
   }
   
   #endif
   /* }====================================================== */
   
   /*
   ** set functions from list 'l' into table at top - 'nup'; each
   ** function gets the 'nup' elements at the top as upvalues.
   ** Returns with only the table at the stack.
   */
   LUALIB_API void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup) {
     luaL_checkversion(L);
     luaL_checkstack(L, nup, "too many upvalues");
     for (; l->name != NULL; l++) {  /* fill the table with given functions */
       int i;
       for (i = 0; i < nup; i++)  /* copy upvalues to the top */
         lua_pushvalue(L, -nup);
       lua_pushcclosure(L, l->func, nup);  /* closure with those upvalues */
       lua_setfield(L, -(nup + 2), l->name);
     }
     lua_pop(L, nup);  /* remove upvalues */
   }
   
   
   /*
   ** ensure that stack[idx][fname] has a table and push that table
   ** into the stack
   */
   LUALIB_API int luaL_getsubtable (lua_State *L, int idx, const char *fname) {
     lua_getfield(L, idx, fname);
     if (lua_istable(L, -1)) return 1;  /* table already there */
     else {
       lua_pop(L, 1);  /* remove previous result */
       idx = lua_absindex(L, idx);
       lua_newtable(L);
       lua_pushvalue(L, -1);  /* copy to be left at top */
       lua_setfield(L, idx, fname);  /* assign new table to field */
       return 0;  /* false, because did not find table there */
     }
   }
   
   
   /*
   ** stripped-down 'require'. Calls 'openf' to open a module,
   ** registers the result in 'package.loaded' table and, if 'glb'
   ** is true, also registers the result in the global table.
   ** Leaves resulting module on the top.
   */
   LUALIB_API void luaL_requiref (lua_State *L, const char *modname,
                                  lua_CFunction openf, int glb) {
     lua_pushcfunction(L, openf);
     lua_pushstring(L, modname);  /* argument to open function */
     lua_call(L, 1, 1);  /* open module */
     luaL_getsubtable(L, LUA_REGISTRYINDEX, "_LOADED");
     lua_pushvalue(L, -2);  /* make copy of module (call result) */
     lua_setfield(L, -2, modname);  /* _LOADED[modname] = module */
     lua_pop(L, 1);  /* remove _LOADED table */
     if (glb) {
       lua_pushvalue(L, -1);  /* copy of 'mod' */
       lua_setglobal(L, modname);  /* _G[modname] = module */
     }
   }
   
   
   LUALIB_API const char *luaL_gsub (lua_State *L, const char *s, const char *p,
                                                                  const char *r) {
     const char *wild;
     size_t l = strlen(p);
     luaL_Buffer b;
     luaL_buffinit(L, &b);
     while ((wild = strstr(s, p)) != NULL) {
       luaL_addlstring(&b, s, wild - s);  /* push prefix */
       luaL_addstring(&b, r);  /* push replacement in place of pattern */
       s = wild + l;  /* continue after `p' */
     }
     luaL_addstring(&b, s);  /* push last suffix */
     luaL_pushresult(&b);
     return lua_tostring(L, -1);
   }
   
   
   LUALIB_API void luaL_checkversion_ (lua_State *L, lua_Number ver) {
     const lua_Number *v = lua_version(L);
     if (v != lua_version(NULL))
       luaL_error(L, "multiple Lua VMs detected");
     else if (*v != ver)
       luaL_error(L, "version mismatch: app. needs %f, Lua core provides %f",
                     ver, *v);
     /* check conversions number -> integer types */
     lua_pushnumber(L, -(lua_Number)0x1234);
     if (lua_tointeger(L, -1) != -0x1234 ||
         lua_tounsigned(L, -1) != (lua_Unsigned)-0x1234)
       luaL_error(L, "bad conversion number->int;"
                     " must recompile Lua with proper settings");
     lua_pop(L, 1);
   }
   
   #if defined(_KERNEL)
   
   EXPORT_SYMBOL(luaL_argerror);
   EXPORT_SYMBOL(luaL_error);
   EXPORT_SYMBOL(luaL_loadbufferx);
   EXPORT_SYMBOL(luaL_newmetatable);
   EXPORT_SYMBOL(luaL_traceback);
   
   #endif

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