1 files changed, 385 insertions, 186 deletions

diff --git a/apps/plugins/lua/lbaselib.c b/apps/plugins/lua/lbaselib.c
index 5255b3cd9b..008e3629fe 100644
--- a/apps/plugins/lua/lbaselib.c
+++ b/apps/plugins/lua/lbaselib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lbaselib.c,v 1.276.1.1 2013/04/12 18:48:47 roberto Exp $
+** $Id: lbaselib.c,v 1.191.1.6 2008/02/14 16:46:22 roberto Exp $
 ** Basic library
 ** See Copyright Notice in lua.h
 */
@@ -20,68 +20,62 @@
 #include "lualib.h"
 
 
+
+
+/*
+** If your system does not support `stdout', you can just remove this function.
+** If you need, you can define your own `print' function, following this
+** model but changing `fputs' to put the strings at a proper place
+** (a console window or a log file, for instance).
+*/
+#if 0
 static int luaB_print (lua_State *L) {
   int n = lua_gettop(L);  /* number of arguments */
   int i;
   lua_getglobal(L, "tostring");
   for (i=1; i<=n; i++) {
     const char *s;
-    size_t l;
     lua_pushvalue(L, -1);  /* function to be called */
     lua_pushvalue(L, i);   /* value to print */
     lua_call(L, 1, 1);
-    s = lua_tolstring(L, -1, &l);  /* get result */
+    s = lua_tostring(L, -1);  /* get result */
     if (s == NULL)
-      return luaL_error(L,
-         LUA_QL("tostring") " must return a string to " LUA_QL("print"));
-    if (i>1) luai_writestring("\t", 1);
-    luai_writestring(s, l);
+      return luaL_error(L, LUA_QL("tostring") " must return a string to "
+                           LUA_QL("print"));
+    if (i>1) fputs("\t", stdout);
+    fputs(s, stdout);
     lua_pop(L, 1);  /* pop result */
   }
-  luai_writeline();
+  fputs("\n", stdout);
   return 0;
 }
+#endif
 
 
-#define SPACECHARS      " \f\n\r\t\v"
-
 static int luaB_tonumber (lua_State *L) {
-  if (lua_isnoneornil(L, 2)) {  /* standard conversion */
-    int isnum;
-    lua_Number n = lua_tonumberx(L, 1, &isnum);
-    if (isnum) {
-      lua_pushnumber(L, n);
-      return 1;
-    }  /* else not a number; must be something */
+  int base = luaL_optint(L, 2, 10);
+  if (base == 10) {  /* standard conversion */
     luaL_checkany(L, 1);
+    if (lua_isnumber(L, 1)) {
+      lua_pushnumber(L, lua_tonumber(L, 1));
+      return 1;
+    }
   }
   else {
-    size_t l;
-    const char *s = luaL_checklstring(L, 1, &l);
-    const char *e = s + l;  /* end point for 's' */
-    int base = luaL_checkint(L, 2);
-    int neg = 0;
+    const char *s1 = luaL_checkstring(L, 1);
+    char *s2;
+    unsigned long n;
     luaL_argcheck(L, 2 <= base && base <= 36, 2, "base out of range");
-    s += strspn(s, SPACECHARS);  /* skip initial spaces */
-    if (*s == '-') { s++; neg = 1; }  /* handle signal */
-    else if (*s == '+') s++;
-    if (isalnum((unsigned char)*s)) {
-      lua_Number n = 0;
-      do {
-        int digit = (isdigit((unsigned char)*s)) ? *s - '0'
-                       : toupper((unsigned char)*s) - 'A' + 10;
-        if (digit >= base) break;  /* invalid numeral; force a fail */
-        n = n * (lua_Number)base + (lua_Number)digit;
-        s++;
-      } while (isalnum((unsigned char)*s));
-      s += strspn(s, SPACECHARS);  /* skip trailing spaces */
-      if (s == e) {  /* no invalid trailing characters? */
-        lua_pushnumber(L, (neg) ? -n : n);
+    n = strtoul(s1, &s2, base);
+    if (s1 != s2) {  /* at least one valid digit? */
+      while (isspace((unsigned char)(*s2))) s2++;  /* skip trailing spaces */
+      if (*s2 == '\0') {  /* no invalid trailing characters? */
+        lua_pushnumber(L, (lua_Number)n);
         return 1;
-      }  /* else not a number */
-    }  /* else not a number */
+      }
+    }
   }
-  lua_pushnil(L);  /* not a number */
+  lua_pushnil(L);  /* else not a number */
   return 1;
 }
 
@@ -115,26 +109,61 @@ static int luaB_setmetatable (lua_State *L) {
   luaL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2,
                     "nil or table expected");
   if (luaL_getmetafield(L, 1, "__metatable"))
-    return luaL_error(L, "cannot change a protected metatable");
+    luaL_error(L, "cannot change a protected metatable");
   lua_settop(L, 2);
   lua_setmetatable(L, 1);
   return 1;
 }
 
 
-static int luaB_rawequal (lua_State *L) {
-  luaL_checkany(L, 1);
-  luaL_checkany(L, 2);
-  lua_pushboolean(L, lua_rawequal(L, 1, 2));
+static void getfunc (lua_State *L, int opt) {
+  if (lua_isfunction(L, 1)) lua_pushvalue(L, 1);
+  else {
+    lua_Debug ar;
+    int level = opt ? luaL_optint(L, 1, 1) : luaL_checkint(L, 1);
+    luaL_argcheck(L, level >= 0, 1, "level must be non-negative");
+    if (lua_getstack(L, level, &ar) == 0)
+      luaL_argerror(L, 1, "invalid level");
+    lua_getinfo(L, "f", &ar);
+    if (lua_isnil(L, -1))
+      luaL_error(L, "no function environment for tail call at level %d",
+                    level);
+  }
+}
+
+
+static int luaB_getfenv (lua_State *L) {
+  getfunc(L, 1);
+  if (lua_iscfunction(L, -1))  /* is a C function? */
+    lua_pushvalue(L, LUA_GLOBALSINDEX);  /* return the thread's global env. */
+  else
+    lua_getfenv(L, -1);
   return 1;
 }
 
 
-static int luaB_rawlen (lua_State *L) {
-  int t = lua_type(L, 1);
-  luaL_argcheck(L, t == LUA_TTABLE || t == LUA_TSTRING, 1,
-                   "table or string expected");
-  lua_pushinteger(L, lua_rawlen(L, 1));
+static int luaB_setfenv (lua_State *L) {
+  luaL_checktype(L, 2, LUA_TTABLE);
+  getfunc(L, 0);
+  lua_pushvalue(L, 2);
+  if (lua_isnumber(L, 1) && lua_tonumber(L, 1) == 0) {
+    /* change environment of current thread */
+    lua_pushthread(L);
+    lua_insert(L, -2);
+    lua_setfenv(L, -2);
+    return 0;
+  }
+  else if (lua_iscfunction(L, -2) || lua_setfenv(L, -2) == 0)
+    luaL_error(L,
+          LUA_QL("setfenv") " cannot change environment of given object");
+  return 1;
+}
+
+
+static int luaB_rawequal (lua_State *L) {
+  luaL_checkany(L, 1);
+  luaL_checkany(L, 2);
+  lua_pushboolean(L, lua_rawequal(L, 1, 2));
   return 1;
 }
 
@@ -157,29 +186,32 @@ static int luaB_rawset (lua_State *L) {
 }
 
 
+static int luaB_gcinfo (lua_State *L) {
+  lua_pushinteger(L, lua_getgccount(L));
+  return 1;
+}
+
+
 static int luaB_collectgarbage (lua_State *L) {
   static const char *const opts[] = {"stop", "restart", "collect",
-    "count", "step", "setpause", "setstepmul",
-    "setmajorinc", "isrunning", "generational", "incremental", NULL};
+    "count", "step", "setpause", "setstepmul", NULL};
   static const int optsnum[] = {LUA_GCSTOP, LUA_GCRESTART, LUA_GCCOLLECT,
-    LUA_GCCOUNT, LUA_GCSTEP, LUA_GCSETPAUSE, LUA_GCSETSTEPMUL,
-    LUA_GCSETMAJORINC, LUA_GCISRUNNING, LUA_GCGEN, LUA_GCINC};
-  int o = optsnum[luaL_checkoption(L, 1, "collect", opts)];
+    LUA_GCCOUNT, LUA_GCSTEP, LUA_GCSETPAUSE, LUA_GCSETSTEPMUL};
+  int o = luaL_checkoption(L, 1, "collect", opts);
   int ex = luaL_optint(L, 2, 0);
-  int res = lua_gc(L, o, ex);
-  switch (o) {
+  int res = lua_gc(L, optsnum[o], ex);
+  switch (optsnum[o]) {
     case LUA_GCCOUNT: {
       int b = lua_gc(L, LUA_GCCOUNTB, 0);
       lua_pushnumber(L, res + ((lua_Number)b/1024));
-      lua_pushinteger(L, b);
-      return 2;
+      return 1;
     }
-    case LUA_GCSTEP: case LUA_GCISRUNNING: {
+    case LUA_GCSTEP: {
       lua_pushboolean(L, res);
       return 1;
     }
     default: {
-      lua_pushinteger(L, res);
+      lua_pushnumber(L, res);
       return 1;
     }
   }
@@ -193,23 +225,6 @@ static int luaB_type (lua_State *L) {
 }
 
 
-static int pairsmeta (lua_State *L, const char *method, int iszero,
-                      lua_CFunction iter) {
-  if (!luaL_getmetafield(L, 1, method)) {  /* no metamethod? */
-    luaL_checktype(L, 1, LUA_TTABLE);  /* argument must be a table */
-    lua_pushcfunction(L, iter);  /* will return generator, */
-    lua_pushvalue(L, 1);  /* state, */
-    if (iszero) lua_pushinteger(L, 0);  /* and initial value */
-    else lua_pushnil(L);
-  }
-  else {
-    lua_pushvalue(L, 1);  /* argument 'self' to metamethod */
-    lua_call(L, 1, 3);  /* get 3 values from metamethod */
-  }
-  return 3;
-}
-
-
 static int luaB_next (lua_State *L) {
   luaL_checktype(L, 1, LUA_TTABLE);
   lua_settop(L, 2);  /* create a 2nd argument if there isn't one */
@@ -223,7 +238,11 @@ static int luaB_next (lua_State *L) {
 
 
 static int luaB_pairs (lua_State *L) {
-  return pairsmeta(L, "__pairs", 0, luaB_next);
+  luaL_checktype(L, 1, LUA_TTABLE);
+  lua_pushvalue(L, lua_upvalueindex(1));  /* return generator, */
+  lua_pushvalue(L, 1);  /* state, */
+  lua_pushnil(L);  /* and initial value */
+  return 3;
 }
 
 
@@ -233,25 +252,23 @@ static int ipairsaux (lua_State *L) {
   i++;  /* next value */
   lua_pushinteger(L, i);
   lua_rawgeti(L, 1, i);
-  return (lua_isnil(L, -1)) ? 1 : 2;
+  return (lua_isnil(L, -1)) ? 0 : 2;
 }
 
 
 static int luaB_ipairs (lua_State *L) {
-  return pairsmeta(L, "__ipairs", 1, ipairsaux);
+  luaL_checktype(L, 1, LUA_TTABLE);
+  lua_pushvalue(L, lua_upvalueindex(1));  /* return generator, */
+  lua_pushvalue(L, 1);  /* state, */
+  lua_pushinteger(L, 0);  /* and initial value */
+  return 3;
 }
 
 
-static int load_aux (lua_State *L, int status, int envidx) {
-  if (status == LUA_OK) {
-    if (envidx != 0) {  /* 'env' parameter? */
-      lua_pushvalue(L, envidx);  /* environment for loaded function */
-      if (!lua_setupvalue(L, -2, 1))  /* set it as 1st upvalue */
-        lua_pop(L, 1);  /* remove 'env' if not used by previous call */
-    }
+static int load_aux (lua_State *L, int status) {
+  if (status == 0)  /* OK? */
     return 1;
-  }
-  else {  /* error (message is on top of the stack) */
+  else {
     lua_pushnil(L);
     lua_insert(L, -2);  /* put before error message */
     return 2;  /* return nil plus error message */
@@ -259,28 +276,18 @@ static int load_aux (lua_State *L, int status, int envidx) {
 }
 
 
-static int luaB_loadfile (lua_State *L) {
-  const char *fname = luaL_optstring(L, 1, NULL);
-  const char *mode = luaL_optstring(L, 2, NULL);
-  int env = (!lua_isnone(L, 3) ? 3 : 0);  /* 'env' index or 0 if no 'env' */
-  int status = luaL_loadfilex(L, fname, mode);
-  return load_aux(L, status, env);
+static int luaB_loadstring (lua_State *L) {
+  size_t l;
+  const char *s = luaL_checklstring(L, 1, &l);
+  const char *chunkname = luaL_optstring(L, 2, s);
+  return load_aux(L, luaL_loadbuffer(L, s, l, chunkname));
 }
 
 
-/*
-** {======================================================
-** Generic Read function
-** =======================================================
-*/
-
-
-/*
-** reserved slot, above all arguments, to hold a copy of the returned
-** string to avoid it being collected while parsed. 'load' has four
-** optional arguments (chunk, source name, mode, and environment).
-*/
-#define RESERVEDSLOT    5
+static int luaB_loadfile (lua_State *L) {
+  const char *fname = luaL_optstring(L, 1, NULL);
+  return load_aux(L, luaL_loadfile(L, fname));
+}
 
 
 /*
@@ -290,66 +297,66 @@ static int luaB_loadfile (lua_State *L) {
 ** reserved slot inside the stack.
 */
 static const char *generic_reader (lua_State *L, void *ud, size_t *size) {
-  (void)(ud);  /* not used */
+  (void)ud;  /* to avoid warnings */
   luaL_checkstack(L, 2, "too many nested functions");
   lua_pushvalue(L, 1);  /* get function */
   lua_call(L, 0, 1);  /* call it */
   if (lua_isnil(L, -1)) {
-    lua_pop(L, 1);  /* pop result */
     *size = 0;
     return NULL;
   }
-  else if (!lua_isstring(L, -1))
-    luaL_error(L, "reader function must return a string");
-  lua_replace(L, RESERVEDSLOT);  /* save string in reserved slot */
-  return lua_tolstring(L, RESERVEDSLOT, size);
+  else if (lua_isstring(L, -1)) {
+    lua_replace(L, 3);  /* save string in a reserved stack slot */
+    return lua_tolstring(L, 3, size);
+  }
+  else luaL_error(L, "reader function must return a string");
+  return NULL;  /* to avoid warnings */
 }
 
 
 static int luaB_load (lua_State *L) {
   int status;
-  size_t l;
-  const char *s = lua_tolstring(L, 1, &l);
-  const char *mode = luaL_optstring(L, 3, "bt");
-  int env = (!lua_isnone(L, 4) ? 4 : 0);  /* 'env' index or 0 if no 'env' */
-  if (s != NULL) {  /* loading a string? */
-    const char *chunkname = luaL_optstring(L, 2, s);
-    status = luaL_loadbufferx(L, s, l, chunkname, mode);
-  }
-  else {  /* loading from a reader function */
-    const char *chunkname = luaL_optstring(L, 2, "=(load)");
-    luaL_checktype(L, 1, LUA_TFUNCTION);
-    lua_settop(L, RESERVEDSLOT);  /* create reserved slot */
-    status = lua_load(L, generic_reader, NULL, chunkname, mode);
-  }
-  return load_aux(L, status, env);
-}
-
-/* }====================================================== */
-
-
-static int dofilecont (lua_State *L) {
-  return lua_gettop(L) - 1;
+  const char *cname = luaL_optstring(L, 2, "=(load)");
+  luaL_checktype(L, 1, LUA_TFUNCTION);
+  lua_settop(L, 3);  /* function, eventual name, plus one reserved slot */
+  status = lua_load(L, generic_reader, NULL, cname);
+  return load_aux(L, status);
 }
 
 
 static int luaB_dofile (lua_State *L) {
   const char *fname = luaL_optstring(L, 1, NULL);
-  lua_settop(L, 1);
-  if (luaL_loadfile(L, fname) != LUA_OK)
-    return lua_error(L);
-  lua_callk(L, 0, LUA_MULTRET, 0, dofilecont);
-  return dofilecont(L);
+  int n = lua_gettop(L);
+  if (luaL_loadfile(L, fname) != 0) lua_error(L);
+  lua_call(L, 0, LUA_MULTRET);
+  return lua_gettop(L) - n;
 }
 
 
 static int luaB_assert (lua_State *L) {
+  luaL_checkany(L, 1);
   if (!lua_toboolean(L, 1))
     return luaL_error(L, "%s", luaL_optstring(L, 2, "assertion failed!"));
   return lua_gettop(L);
 }
 
 
+static int luaB_unpack (lua_State *L) {
+  int i, e, n;
+  luaL_checktype(L, 1, LUA_TTABLE);
+  i = luaL_optint(L, 2, 1);
+  e = luaL_opt(L, luaL_checkint, 3, luaL_getn(L, 1));
+  if (i > e) return 0;  /* empty range */
+  n = e - i + 1;  /* number of elements */
+  if (n <= 0 || !lua_checkstack(L, n))  /* n <= 0 means arith. overflow */
+    return luaL_error(L, "too many results to unpack");
+  lua_rawgeti(L, 1, i);  /* push arg[i] (avoiding overflow problems) */
+  while (i++ < e)  /* push arg[i + 1...e] */
+    lua_rawgeti(L, 1, i);
+  return n;
+}
+
+
 static int luaB_select (lua_State *L) {
   int n = lua_gettop(L);
   if (lua_type(L, 1) == LUA_TSTRING && *lua_tostring(L, 1) == '#') {
@@ -366,50 +373,75 @@ static int luaB_select (lua_State *L) {
 }
 
 
-static int finishpcall (lua_State *L, int status) {
-  if (!lua_checkstack(L, 1)) {  /* no space for extra boolean? */
-    lua_settop(L, 0);  /* create space for return values */
-    lua_pushboolean(L, 0);
-    lua_pushstring(L, "stack overflow");
-    return 2;  /* return false, msg */
-  }
-  lua_pushboolean(L, status);  /* first result (status) */
-  lua_replace(L, 1);  /* put first result in first slot */
-  return lua_gettop(L);
-}
-
-
-static int pcallcont (lua_State *L) {
-  int status = lua_getctx(L, NULL);
-  return finishpcall(L, (status == LUA_YIELD));
-}
-
-
 static int luaB_pcall (lua_State *L) {
   int status;
   luaL_checkany(L, 1);
-  lua_pushnil(L);
-  lua_insert(L, 1);  /* create space for status result */
-  status = lua_pcallk(L, lua_gettop(L) - 2, LUA_MULTRET, 0, 0, pcallcont);
-  return finishpcall(L, (status == LUA_OK));
+  status = lua_pcall(L, lua_gettop(L) - 1, LUA_MULTRET, 0);
+  lua_pushboolean(L, (status == 0));
+  lua_insert(L, 1);
+  return lua_gettop(L);  /* return status + all results */
 }
 
 
 static int luaB_xpcall (lua_State *L) {
   int status;
-  int n = lua_gettop(L);
-  luaL_argcheck(L, n >= 2, 2, "value expected");
-  lua_pushvalue(L, 1);  /* exchange function... */
-  lua_copy(L, 2, 1);  /* ...and error handler */
-  lua_replace(L, 2);
-  status = lua_pcallk(L, n - 2, LUA_MULTRET, 1, 0, pcallcont);
-  return finishpcall(L, (status == LUA_OK));
+  luaL_checkany(L, 2);
+  lua_settop(L, 2);
+  lua_insert(L, 1);  /* put error function under function to be called */
+  status = lua_pcall(L, 0, LUA_MULTRET, 1);
+  lua_pushboolean(L, (status == 0));
+  lua_replace(L, 1);
+  return lua_gettop(L);  /* return status + all results */
 }
 
 
 static int luaB_tostring (lua_State *L) {
   luaL_checkany(L, 1);
-  luaL_tolstring(L, 1, NULL);
+  if (luaL_callmeta(L, 1, "__tostring"))  /* is there a metafield? */
+    return 1;  /* use its value */
+  switch (lua_type(L, 1)) {
+    case LUA_TNUMBER:
+      lua_pushstring(L, lua_tostring(L, 1));
+      break;
+    case LUA_TSTRING:
+      lua_pushvalue(L, 1);
+      break;
+    case LUA_TBOOLEAN:
+      lua_pushstring(L, (lua_toboolean(L, 1) ? "true" : "false"));
+      break;
+    case LUA_TNIL:
+      lua_pushliteral(L, "nil");
+      break;
+    default:
+      lua_pushfstring(L, "%s: %p", luaL_typename(L, 1), lua_topointer(L, 1));
+      break;
+  }
+  return 1;
+}
+
+
+static int luaB_newproxy (lua_State *L) {
+  lua_settop(L, 1);
+  lua_newuserdata(L, 0);  /* create proxy */
+  if (lua_toboolean(L, 1) == 0)
+    return 1;  /* no metatable */
+  else if (lua_isboolean(L, 1)) {
+    lua_newtable(L);  /* create a new metatable `m' ... */
+    lua_pushvalue(L, -1);  /* ... and mark `m' as a valid metatable */
+    lua_pushboolean(L, 1);
+    lua_rawset(L, lua_upvalueindex(1));  /* weaktable[m] = true */
+  }
+  else {
+    int validproxy = 0;  /* to check if weaktable[metatable(u)] == true */
+    if (lua_getmetatable(L, 1)) {
+      lua_rawget(L, lua_upvalueindex(1));
+      validproxy = lua_toboolean(L, -1);
+      lua_pop(L, 1);  /* remove value */
+    }
+    luaL_argcheck(L, validproxy, 1, "boolean or proxy expected");
+    lua_getmetatable(L, 1);  /* metatable is valid; get it */
+  }
+  lua_setmetatable(L, 2);
   return 1;
 }
 
@@ -419,40 +451,207 @@ static const luaL_Reg base_funcs[] = {
   {"collectgarbage", luaB_collectgarbage},
   {"dofile", luaB_dofile},
   {"error", luaB_error},
+  {"gcinfo", luaB_gcinfo},
+  {"getfenv", luaB_getfenv},
   {"getmetatable", luaB_getmetatable},
-  {"ipairs", luaB_ipairs},
   {"loadfile", luaB_loadfile},
   {"load", luaB_load},
-#if defined(LUA_COMPAT_LOADSTRING)
-  {"loadstring", luaB_load},
-#endif
+  {"loadstring", luaB_loadstring},
   {"next", luaB_next},
-  {"pairs", luaB_pairs},
   {"pcall", luaB_pcall},
+#if 0
   {"print", luaB_print},
+#endif
   {"rawequal", luaB_rawequal},
-  {"rawlen", luaB_rawlen},
   {"rawget", luaB_rawget},
   {"rawset", luaB_rawset},
   {"select", luaB_select},
+  {"setfenv", luaB_setfenv},
   {"setmetatable", luaB_setmetatable},
   {"tonumber", luaB_tonumber},
   {"tostring", luaB_tostring},
   {"type", luaB_type},
+  {"unpack", luaB_unpack},
   {"xpcall", luaB_xpcall},
   {NULL, NULL}
 };
 
 
-LUAMOD_API int luaopen_base (lua_State *L) {
+/*
+** {======================================================
+** Coroutine library
+** =======================================================
+*/
+
+#define CO_RUN  0       /* running */
+#define CO_SUS  1       /* suspended */
+#define CO_NOR  2       /* 'normal' (it resumed another coroutine) */
+#define CO_DEAD 3
+
+static const char *const statnames[] =
+    {"running", "suspended", "normal", "dead"};
+
+static int costatus (lua_State *L, lua_State *co) {
+  if (L == co) return CO_RUN;
+  switch (lua_status(co)) {
+    case LUA_YIELD:
+      return CO_SUS;
+    case 0: {
+      lua_Debug ar;
+      if (lua_getstack(co, 0, &ar) > 0)  /* does it have frames? */
+        return CO_NOR;  /* it is running */
+      else if (lua_gettop(co) == 0)
+          return CO_DEAD;
+      else
+        return CO_SUS;  /* initial state */
+    }
+    default:  /* some error occured */
+      return CO_DEAD;
+  }
+}
+
+
+static int luaB_costatus (lua_State *L) {
+  lua_State *co = lua_tothread(L, 1);
+  luaL_argcheck(L, co, 1, "coroutine expected");
+  lua_pushstring(L, statnames[costatus(L, co)]);
+  return 1;
+}
+
+
+static int auxresume (lua_State *L, lua_State *co, int narg) {
+  int status = costatus(L, co);
+  if (!lua_checkstack(co, narg))
+    luaL_error(L, "too many arguments to resume");
+  if (status != CO_SUS) {
+    lua_pushfstring(L, "cannot resume %s coroutine", statnames[status]);
+    return -1;  /* error flag */
+  }
+  lua_xmove(L, co, narg);
+  lua_setlevel(L, co);
+  status = lua_resume(co, narg);
+  if (status == 0 || status == LUA_YIELD) {
+    int nres = lua_gettop(co);
+    if (!lua_checkstack(L, nres + 1))
+      luaL_error(L, "too many results to resume");
+    lua_xmove(co, L, nres);  /* move yielded values */
+    return nres;
+  }
+  else {
+    lua_xmove(co, L, 1);  /* move error message */
+    return -1;  /* error flag */
+  }
+}
+
+
+static int luaB_coresume (lua_State *L) {
+  lua_State *co = lua_tothread(L, 1);
+  int r;
+  luaL_argcheck(L, co, 1, "coroutine expected");
+  r = auxresume(L, co, lua_gettop(L) - 1);
+  if (r < 0) {
+    lua_pushboolean(L, 0);
+    lua_insert(L, -2);
+    return 2;  /* return false + error message */
+  }
+  else {
+    lua_pushboolean(L, 1);
+    lua_insert(L, -(r + 1));
+    return r + 1;  /* return true + `resume' returns */
+  }
+}
+
+
+static int luaB_auxwrap (lua_State *L) {
+  lua_State *co = lua_tothread(L, lua_upvalueindex(1));
+  int r = auxresume(L, co, lua_gettop(L));
+  if (r < 0) {
+    if (lua_isstring(L, -1)) {  /* error object is a string? */
+      luaL_where(L, 1);  /* add extra info */
+      lua_insert(L, -2);
+      lua_concat(L, 2);
+    }
+    lua_error(L);  /* propagate error */
+  }
+  return r;
+}
+
+
+static int luaB_cocreate (lua_State *L) {
+  lua_State *NL = lua_newthread(L);
+  luaL_argcheck(L, lua_isfunction(L, 1) && !lua_iscfunction(L, 1), 1,
+    "Lua function expected");
+  lua_pushvalue(L, 1);  /* move function to top */
+  lua_xmove(L, NL, 1);  /* move function from L to NL */
+  return 1;
+}
+
+
+static int luaB_cowrap (lua_State *L) {
+  luaB_cocreate(L);
+  lua_pushcclosure(L, luaB_auxwrap, 1);
+  return 1;
+}
+
+
+static int luaB_yield (lua_State *L) {
+  return lua_yield(L, lua_gettop(L));
+}
+
+
+static int luaB_corunning (lua_State *L) {
+  if (lua_pushthread(L))
+    lua_pushnil(L);  /* main thread is not a coroutine */
+  return 1;
+}
+
+
+static const luaL_Reg co_funcs[] = {
+  {"create", luaB_cocreate},
+  {"resume", luaB_coresume},
+  {"running", luaB_corunning},
+  {"status", luaB_costatus},
+  {"wrap", luaB_cowrap},
+  {"yield", luaB_yield},
+  {NULL, NULL}
+};
+
+/* }====================================================== */
+
+
+static void auxopen (lua_State *L, const char *name,
+                     lua_CFunction f, lua_CFunction u) {
+  lua_pushcfunction(L, u);
+  lua_pushcclosure(L, f, 1);
+  lua_setfield(L, -2, name);
+}
+
+
+static void base_open (lua_State *L) {
   /* set global _G */
-  lua_pushglobaltable(L);
-  lua_pushglobaltable(L);
-  lua_setfield(L, -2, "_G");
+  lua_pushvalue(L, LUA_GLOBALSINDEX);
+  lua_setglobal(L, "_G");
   /* open lib into global table */
-  luaL_setfuncs(L, base_funcs, 0);
+  luaL_register(L, "_G", base_funcs);
   lua_pushliteral(L, LUA_VERSION);
-  lua_setfield(L, -2, "_VERSION");  /* set global _VERSION */
-  return 1;
+  lua_setglobal(L, "_VERSION");  /* set global _VERSION */
+  /* `ipairs' and `pairs' need auxliliary functions as upvalues */
+  auxopen(L, "ipairs", luaB_ipairs, ipairsaux);
+  auxopen(L, "pairs", luaB_pairs, luaB_next);
+  /* `newproxy' needs a weaktable as upvalue */
+  lua_createtable(L, 0, 1);  /* new table `w' */
+  lua_pushvalue(L, -1);  /* `w' will be its own metatable */
+  lua_setmetatable(L, -2);
+  lua_pushliteral(L, "kv");
+  lua_setfield(L, -2, "__mode");  /* metatable(w).__mode = "kv" */
+  lua_pushcclosure(L, luaB_newproxy, 1);
+  lua_setglobal(L, "newproxy");  /* set global `newproxy' */
+}
+
+
+LUALIB_API int luaopen_base (lua_State *L) {
+  base_open(L);
+  luaL_register(L, LUA_COLIBNAME, co_funcs);
+  return 2;
 }