1 files changed, 182 insertions, 180 deletions

diff --git a/liolib.c b/liolib.c
index c1d2a455..1a414a9d 100644
--- a/liolib.c
+++ b/liolib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: liolib.c,v 1.49 1999/10/26 11:00:12 roberto Exp roberto $
+** $Id: liolib.c,v 1.50 1999/11/09 17:59:35 roberto Exp roberto $
 ** Standard I/O (and system) library
 ** See Copyright Notice in lua.h
 */
@@ -12,6 +12,8 @@
 #include <string.h>
 #include <time.h>
 
+#define LUA_REENTRANT
+
 #include "lauxlib.h"
 #include "lua.h"
 #include "luadebug.h"
@@ -22,7 +24,7 @@
 #include <locale.h>
 #else
 /* no support for locale and for strerror: fake them */
-#define setlocale(a,b)  0
+#define setlocale(a,b)  ((void)a, strcmp((b),"C")==0?"C":NULL)
 #define LC_ALL          0
 #define LC_COLLATE      0
 #define LC_CTYPE        0
@@ -37,7 +39,7 @@
 
 #define FIRSTARG        2  /* 1st is upvalue */
 
-#define CLOSEDTAG(tag)  ((tag)-1)  /* assume that CLOSEDTAG = iotag-1 */
+#define CLOSEDTAG(L, tag)       ((tag)-1)  /* assume that CLOSEDTAG = iotag-1 */
 
 
 #define FINPUT          "_INPUT"
@@ -47,22 +49,22 @@
 #ifdef POPEN
 /* FILE *popen();
 int pclose(); */
-#define CLOSEFILE(f)    ((pclose(f) == -1) ? fclose(f) : 0)
+#define CLOSEFILE(L, f)    ((pclose(f) == -1) ? fclose(f) : 0)
 #else
 /* no support for popen */
 #define popen(x,y) NULL  /* that is, popen always fails */
-#define CLOSEFILE(f)    (fclose(f))
+#define CLOSEFILE(L, f)    (fclose(f))
 #endif
 
 
 
-static void pushresult (int i) {
+static void pushresult (lua_State *L, int i) {
   if (i)
-    lua_pushuserdata(NULL);
+    lua_pushuserdata(L, NULL);
   else {
-    lua_pushnil();
-    lua_pushstring(strerror(errno));
-    lua_pushnumber(errno);
+    lua_pushnil(L);
+    lua_pushstring(L, strerror(errno));
+    lua_pushnumber(L, errno);
   }
 }
 
@@ -73,144 +75,144 @@ static void pushresult (int i) {
 ** =======================================================
 */
 
-static int gettag (void) {
-  return (int)lua_getnumber(lua_getparam(IOTAG));
+static int gettag (lua_State *L) {
+  return (int)lua_getnumber(L, lua_getparam(L, IOTAG));
 }
 
 
-static int ishandle (lua_Object f) {
-  if (lua_isuserdata(f)) {
-    int tag = gettag();
-    if (lua_tag(f) == CLOSEDTAG(tag))
-      lua_error("cannot access a closed file");
-    return lua_tag(f) == tag;
+static int ishandle (lua_State *L, lua_Object f) {
+  if (lua_isuserdata(L, f)) {
+    int tag = gettag(L);
+    if (lua_tag(L, f) == CLOSEDTAG(L, tag))
+      lua_error(L, "cannot access a closed file");
+    return lua_tag(L, f) == tag;
   }
   else return 0;
 }
 
 
-static FILE *getfilebyname (const char *name) {
-  lua_Object f = lua_rawgetglobal(name);
-  if (!ishandle(f))
-      luaL_verror("global variable `%.50s' is not a file handle", name);
-  return lua_getuserdata(f);
+static FILE *getfilebyname (lua_State *L, const char *name) {
+  lua_Object f = lua_rawgetglobal(L, name);
+  if (!ishandle(L, f))
+      luaL_verror(L, "global variable `%.50s' is not a file handle", name);
+  return lua_getuserdata(L, f);
 }
 
 
-static FILE *getfile (int arg) {
-  lua_Object f = lua_getparam(arg);
-  return (ishandle(f)) ? lua_getuserdata(f) : NULL;
+static FILE *getfile (lua_State *L, int arg) {
+  lua_Object f = lua_getparam(L, arg);
+  return (ishandle(L, f)) ? lua_getuserdata(L, f) : NULL;
 }
 
 
-static FILE *getnonullfile (int arg) {
-  FILE *f = getfile(arg);
-  luaL_arg_check(f, arg, "invalid file handle");
+static FILE *getnonullfile (lua_State *L, int arg) {
+  FILE *f = getfile(L, arg);
+  luaL_arg_check(L, f, arg, "invalid file handle");
   return f;
 }
 
 
-static FILE *getfileparam (const char *name, int *arg) {
-  FILE *f = getfile(*arg);
+static FILE *getfileparam (lua_State *L, const char *name, int *arg) {
+  FILE *f = getfile(L, *arg);
   if (f) {
     (*arg)++;
     return f;
   }
   else
-    return getfilebyname(name);
+    return getfilebyname(L, name);
 }
 
 
-static int closefile (FILE *f) {
+static int closefile (lua_State *L, FILE *f) {
   if (f == stdin || f == stdout)
     return 1;
   else {
-    int tag = gettag();
-    lua_pushusertag(f, tag);
-    lua_settag(CLOSEDTAG(tag));
-    return (CLOSEFILE(f) == 0);
+    int tag = gettag(L);
+    lua_pushusertag(L, f, tag);
+    lua_settag(L, CLOSEDTAG(L, tag));
+    return (CLOSEFILE(L, f) == 0);
   }
 }
 
 
-static void io_close (void) {
-  pushresult(closefile(getnonullfile(FIRSTARG)));
+static void io_close (lua_State *L) {
+  pushresult(L, closefile(L, getnonullfile(L, FIRSTARG)));
 }
 
 
-static void gc_close (void) {
-  FILE *f = getnonullfile(FIRSTARG);
+static void gc_close (lua_State *L) {
+  FILE *f = getnonullfile(L, FIRSTARG);
   if (f != stdin && f != stdout && f != stderr) {
-    CLOSEFILE(f);
+    CLOSEFILE(L, f);
   }
 }
 
 
-static void io_open (void) {
-  FILE *f = fopen(luaL_check_string(FIRSTARG), luaL_check_string(FIRSTARG+1));
-  if (f) lua_pushusertag(f, gettag());
-  else pushresult(0);
+static void io_open (lua_State *L) {
+  FILE *f = fopen(luaL_check_string(L, FIRSTARG), luaL_check_string(L, FIRSTARG+1));
+  if (f) lua_pushusertag(L, f, gettag(L));
+  else pushresult(L, 0);
 }
 
 
-static void setfile (FILE *f, const char *name, int tag) {
-  lua_pushusertag(f, tag);
-  lua_setglobal(name);
+static void setfile (lua_State *L, FILE *f, const char *name, int tag) {
+  lua_pushusertag(L, f, tag);
+  lua_setglobal(L, name);
 }
 
 
-static void setreturn (FILE *f, const char *name) {
+static void setreturn (lua_State *L, FILE *f, const char *name) {
   if (f == NULL)
-    pushresult(0);
+    pushresult(L, 0);
   else {
-    int tag = gettag();
-    setfile(f, name, tag);
-    lua_pushusertag(f, tag);
+    int tag = gettag(L);
+    setfile(L, f, name, tag);
+    lua_pushusertag(L, f, tag);
   }
 }
 
 
-static void io_readfrom (void) {
+static void io_readfrom (lua_State *L) {
   FILE *current;
-  lua_Object f = lua_getparam(FIRSTARG);
+  lua_Object f = lua_getparam(L, FIRSTARG);
   if (f == LUA_NOOBJECT) {
-    if (closefile(getfilebyname(FINPUT)))
+    if (closefile(L, getfilebyname(L, FINPUT)))
       current = stdin;
     else
       current = NULL;  /* to signal error */
   }
-  else if (lua_tag(f) == gettag())  /* deprecated option */
-    current = lua_getuserdata(f);
+  else if (lua_tag(L, f) == gettag(L))  /* deprecated option */
+    current = lua_getuserdata(L, f);
   else {
-    const char *s = luaL_check_string(FIRSTARG);
+    const char *s = luaL_check_string(L, FIRSTARG);
     current = (*s == '|') ? popen(s+1, "r") : fopen(s, "r");
   }
-  setreturn(current, FINPUT);
+  setreturn(L, current, FINPUT);
 }
 
 
-static void io_writeto (void) {
+static void io_writeto (lua_State *L) {
   FILE *current;
-  lua_Object f = lua_getparam(FIRSTARG);
+  lua_Object f = lua_getparam(L, FIRSTARG);
   if (f == LUA_NOOBJECT) {
-    if (closefile(getfilebyname(FOUTPUT)))
+    if (closefile(L, getfilebyname(L, FOUTPUT)))
       current = stdout;
     else
       current = NULL;  /* to signal error */
   }
-  else if (lua_tag(f) == gettag())  /* deprecated option */
-    current = lua_getuserdata(f);
+  else if (lua_tag(L, f) == gettag(L))  /* deprecated option */
+    current = lua_getuserdata(L, f);
   else {
-    const char *s = luaL_check_string(FIRSTARG);
+    const char *s = luaL_check_string(L, FIRSTARG);
     current = (*s == '|') ? popen(s+1,"w") : fopen(s, "w");
   }
-  setreturn(current, FOUTPUT);
+  setreturn(L, current, FOUTPUT);
 }
 
 
-static void io_appendto (void) {
-  FILE *current = fopen(luaL_check_string(FIRSTARG), "a");
-  setreturn(current, FOUTPUT);
+static void io_appendto (lua_State *L) {
+  FILE *current = fopen(luaL_check_string(L, FIRSTARG), "a");
+  setreturn(L, current, FOUTPUT);
 }
 
 
@@ -232,7 +234,7 @@ static void io_appendto (void) {
 #define NEED_OTHER (EOF-1)  /* just some flag different from EOF */
 
 
-static int read_pattern (FILE *f, const char *p) {
+static int read_pattern (lua_State *L, FILE *f, const char *p) {
   int inskip = 0;  /* {skip} level */
   int c = NEED_OTHER;
   while (*p != '\0') {
@@ -242,17 +244,17 @@ static int read_pattern (FILE *f, const char *p) {
         p++;
         continue;
       case '}':
-        if (!inskip) lua_error("unbalanced braces in read pattern");
+        if (!inskip) lua_error(L, "unbalanced braces in read pattern");
         inskip--;
         p++;
         continue;
       default: {
-        const char *ep = luaI_classend(p);  /* get what is next */
+        const char *ep = luaI_classend(L, p);  /* get what is next */
         int m;  /* match result */
         if (c == NEED_OTHER) c = getc(f);
         m = (c==EOF) ? 0 : luaI_singlematch(c, p, ep);
         if (m) {
-          if (!inskip) luaL_addchar(c);
+          if (!inskip) luaL_addchar(L, c);
           c = NEED_OTHER;
         }
         switch (*ep) {
@@ -263,7 +265,7 @@ static int read_pattern (FILE *f, const char *p) {
             while (m) {  /* reads the same item until it fails */
               c = getc(f);
               m = (c==EOF) ? 0 : luaI_singlematch(c, p, ep);
-              if (m && !inskip) luaL_addchar(c);
+              if (m && !inskip) luaL_addchar(L, c);
             }
             /* go through to continue reading the pattern */
           case '?':  /* optional */
@@ -282,26 +284,26 @@ static int read_pattern (FILE *f, const char *p) {
 
 #else
 
-#define read_pattern(f,p)   (lua_error("read patterns are deprecated"), 0)
+#define read_pattern(L, f,p)   (lua_error(L, "read patterns are deprecated"), 0)
 
 #endif
 
 
-static int read_number (FILE *f) {
+static int read_number (lua_State *L, FILE *f) {
   double d;
   if (fscanf(f, "%lf", &d) == 1) {
-    lua_pushnumber(d);
+    lua_pushnumber(L, d);
     return 1;
   }
   else return 0;  /* read fails */
 }
 
 
-static void read_word (FILE *f) {
+static void read_word (lua_State *L, FILE *f) {
   int c;
   do { c = fgetc(f); } while isspace(c);  /* skip spaces */
   while (c != EOF && !isspace(c)) {
-    luaL_addchar(c);
+    luaL_addchar(L, c);
     c = fgetc(f);
   }
   ungetc(c, f);
@@ -311,127 +313,127 @@ static void read_word (FILE *f) {
 #define HUNK_LINE       256
 #define HUNK_FILE       BUFSIZ
 
-static int read_line (FILE *f) {
+static int read_line (lua_State *L, FILE *f) {
   int n;
   char *b;
   do {
-    b = luaL_openspace(HUNK_LINE);
+    b = luaL_openspace(L, HUNK_LINE);
     if (!fgets(b, HUNK_LINE, f)) return 0;  /* read fails */
     n = strlen(b);
-    luaL_addsize(n); 
+    luaL_addsize(L, n); 
   } while (b[n-1] != '\n');
-  luaL_addsize(-1);  /* remove '\n' */
+  luaL_addsize(L, -1);  /* remove '\n' */
   return 1;
 }
 
 
-static void read_file (FILE *f) {
+static void read_file (lua_State *L, FILE *f) {
   int n;
   do {
-    char *b = luaL_openspace(HUNK_FILE);
+    char *b = luaL_openspace(L, HUNK_FILE);
     n = fread(b, sizeof(char), HUNK_FILE, f);
-    luaL_addsize(n);
+    luaL_addsize(L, n);
   } while (n==HUNK_FILE);
 }
 
 
-static int read_chars (FILE *f, int n) {
-  char *b = luaL_openspace(n);
+static int read_chars (lua_State *L, FILE *f, int n) {
+  char *b = luaL_openspace(L, n);
   int n1 = fread(b, sizeof(char), n, f);
-  luaL_addsize(n1);
+  luaL_addsize(L, n1);
   return (n == n1);
 }
 
 
-static void io_read (void) {
+static void io_read (lua_State *L) {
   int arg = FIRSTARG;
-  FILE *f = getfileparam(FINPUT, &arg);
-  lua_Object op = lua_getparam(arg);
+  FILE *f = getfileparam(L, FINPUT, &arg);
+  lua_Object op = lua_getparam(L, arg);
   do {  /* repeat for each part */
     long l;
     int success;
-    luaL_resetbuffer();
-    if (lua_isnumber(op))
-      success = read_chars(f, (int)lua_getnumber(op));
+    luaL_resetbuffer(L);
+    if (lua_isnumber(L, op))
+      success = read_chars(L, f, (int)lua_getnumber(L, op));
     else {
-      const char *p = luaL_opt_string(arg, "*l");
+      const char *p = luaL_opt_string(L, arg, "*l");
       if (p[0] != '*')
-        success = read_pattern(f, p);  /* deprecated! */
+        success = read_pattern(L, f, p);  /* deprecated! */
       else {
         switch (p[1]) {
           case 'n':  /* number */
-            if (!read_number(f)) return;  /* read fails */
+            if (!read_number(L, f)) return;  /* read fails */
             continue;  /* number is already pushed; avoid the "pushstring" */
           case 'l':  /* line */
-            success = read_line(f);
+            success = read_line(L, f);
             break;
           case 'a':  /* file */
-            read_file(f);
+            read_file(L, f);
             success = 1; /* always success */
             break;
           case 'w':  /* word */
-            read_word(f);
+            read_word(L, f);
             success = 0;  /* must read something to succeed */
             break;
           default:
-            luaL_argerror(arg, "invalid format");
+            luaL_argerror(L, arg, "invalid format");
             success = 0;  /* to avoid warnings */
         }
       }
     }
-    l = luaL_getsize();
+    l = luaL_getsize(L);
     if (!success && l==0) return;  /* read fails */
-    lua_pushlstring(luaL_buffer(), l);
-  } while ((op = lua_getparam(++arg)) != LUA_NOOBJECT);
+    lua_pushlstring(L, luaL_buffer(L), l);
+  } while ((op = lua_getparam(L, ++arg)) != LUA_NOOBJECT);
 }
 
 /* }====================================================== */
 
 
-static void io_write (void) {
+static void io_write (lua_State *L) {
   int arg = FIRSTARG;
-  FILE *f = getfileparam(FOUTPUT, &arg);
+  FILE *f = getfileparam(L, FOUTPUT, &arg);
   int status = 1;
   lua_Object o;
-  while ((o = lua_getparam(arg++)) != LUA_NOOBJECT) {
-    switch (lua_type(o)[2]) {
+  while ((o = lua_getparam(L, arg++)) != LUA_NOOBJECT) {
+    switch (lua_type(L, o)[2]) {
       case 'r': {  /* stRing? */
-        long l = lua_strlen(o);
+        long l = lua_strlen(L, o);
         status = status &&
-                 ((long)fwrite(lua_getstring(o), sizeof(char), l, f) == l);
+                 ((long)fwrite(lua_getstring(L, o), sizeof(char), l, f) == l);
         break;
       }
       case 'm': /* nuMber? */  /* LUA_NUMBER */
         /* optimization: could be done exactly as for strings */
-        status = status && fprintf(f, "%.16g", lua_getnumber(o)) > 0;
+        status = status && fprintf(f, "%.16g", lua_getnumber(L, o)) > 0;
         break;
-      default: luaL_argerror(arg-1, "string expected");
+      default: luaL_argerror(L, arg-1, "string expected");
     }
   }
-  pushresult(status);
+  pushresult(L, status);
 }
 
 
-static void io_seek (void) {
+static void io_seek (lua_State *L) {
   static const int mode[] = {SEEK_SET, SEEK_CUR, SEEK_END};
   static const char *const modenames[] = {"set", "cur", "end", NULL};
-  FILE *f = getnonullfile(FIRSTARG);
-  int op = luaL_findstring(luaL_opt_string(FIRSTARG+1, "cur"), modenames);
-  long offset = luaL_opt_long(FIRSTARG+2, 0);
-  luaL_arg_check(op != -1, FIRSTARG+1, "invalid mode");
+  FILE *f = getnonullfile(L, FIRSTARG);
+  int op = luaL_findstring(luaL_opt_string(L, FIRSTARG+1, "cur"), modenames);
+  long offset = luaL_opt_long(L, FIRSTARG+2, 0);
+  luaL_arg_check(L, op != -1, FIRSTARG+1, "invalid mode");
   op = fseek(f, offset, mode[op]);
   if (op)
-    pushresult(0);  /* error */
+    pushresult(L, 0);  /* error */
   else
-    lua_pushnumber(ftell(f));
+    lua_pushnumber(L, ftell(f));
 }
 
 
-static void io_flush (void) {
-  FILE *f = getfile(FIRSTARG);
-  luaL_arg_check(f || lua_getparam(FIRSTARG) == LUA_NOOBJECT, FIRSTARG,
+static void io_flush (lua_State *L) {
+  FILE *f = getfile(L, FIRSTARG);
+  luaL_arg_check(L, f || lua_getparam(L, FIRSTARG) == LUA_NOOBJECT, FIRSTARG,
                  "invalid file handle");
-  pushresult(fflush(f) == 0);
+  pushresult(L, fflush(f) == 0);
 }
 
 /* }====================================================== */
@@ -443,102 +445,102 @@ static void io_flush (void) {
 ** =======================================================
 */
 
-static void io_execute (void) {
-  lua_pushnumber(system(luaL_check_string(1)));
+static void io_execute (lua_State *L) {
+  lua_pushnumber(L, system(luaL_check_string(L, 1)));
 }
 
 
-static void io_remove  (void) {
-  pushresult(remove(luaL_check_string(1)) == 0);
+static void io_remove (lua_State *L) {
+  pushresult(L, remove(luaL_check_string(L, 1)) == 0);
 }
 
 
-static void io_rename (void) {
-  pushresult(rename(luaL_check_string(1),
-                    luaL_check_string(2)) == 0);
+static void io_rename (lua_State *L) {
+  pushresult(L, rename(luaL_check_string(L, 1),
+                    luaL_check_string(L, 2)) == 0);
 }
 
 
-static void io_tmpname (void) {
-  lua_pushstring(tmpnam(NULL));
+static void io_tmpname (lua_State *L) {
+  lua_pushstring(L, tmpnam(NULL));
 }
 
 
 
-static void io_getenv (void) {
-  lua_pushstring(getenv(luaL_check_string(1)));  /* if NULL push nil */
+static void io_getenv (lua_State *L) {
+  lua_pushstring(L, getenv(luaL_check_string(L, 1)));  /* if NULL push nil */
 }
 
 
-static void io_clock (void) {
-  lua_pushnumber(((double)clock())/CLOCKS_PER_SEC);
+static void io_clock (lua_State *L) {
+  lua_pushnumber(L, ((double)clock())/CLOCKS_PER_SEC);
 }
 
 
-static void io_date (void) {
+static void io_date (lua_State *L) {
   char b[256];
-  const char *s = luaL_opt_string(1, "%c");
+  const char *s = luaL_opt_string(L, 1, "%c");
   struct tm *tm;
   time_t t;
   time(&t); tm = localtime(&t);
   if (strftime(b,sizeof(b),s,tm))
-    lua_pushstring(b);
+    lua_pushstring(L, b);
   else
-    lua_error("invalid `date' format");
+    lua_error(L, "invalid `date' format");
 }
 
 
-static void setloc (void) {
+static void setloc (lua_State *L) {
   static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
                       LC_NUMERIC, LC_TIME};
   static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
      "numeric", "time", NULL};
-  int op = luaL_findstring(luaL_opt_string(2, "all"), catnames);
-  luaL_arg_check(op != -1, 2, "invalid option");
-  lua_pushstring(setlocale(cat[op], luaL_check_string(1)));
+  int op = luaL_findstring(luaL_opt_string(L, 2, "all"), catnames);
+  luaL_arg_check(L, op != -1, 2, "invalid option");
+  lua_pushstring(L, setlocale(cat[op], luaL_check_string(L, 1)));
 }
 
 
-static void io_exit (void) {
-  exit(luaL_opt_int(1, EXIT_SUCCESS));
+static void io_exit (lua_State *L) {
+  exit(luaL_opt_int(L, 1, EXIT_SUCCESS));
 }
 
 /* }====================================================== */
 
 
 
-static void io_debug (void) {
+static void io_debug (lua_State *L) {
   for (;;) {
     char buffer[250];
     fprintf(stderr, "lua_debug> ");
     if (fgets(buffer, sizeof(buffer), stdin) == 0 ||
         strcmp(buffer, "cont\n") == 0)
       return;
-    lua_dostring(buffer);
+    lua_dostring(L, buffer);
   }
 }
 
 
 
 #define MESSAGESIZE     150
-#define MAXMESSAGE      (MESSAGESIZE*10)
+#define MAXMESSAGE (MESSAGESIZE*10)
 
 
 #define MAXSRC          60
 
 
-static void errorfb (void) {
+static void errorfb (lua_State *L) {
   char buff[MAXMESSAGE];
   int level = 1;  /* skip level 0 (it's this function) */
   lua_Object func;
-  sprintf(buff, "lua error: %.200s\n", lua_getstring(lua_getparam(1)));
-  while ((func = lua_stackedfunction(level++)) != LUA_NOOBJECT) {
+  sprintf(buff, "lua error: %.200s\n", lua_getstring(L, lua_getparam(L, 1)));
+  while ((func = lua_stackedfunction(L, level++)) != LUA_NOOBJECT) {
     const char *name;
     int currentline;
     const char *chunkname;
     char buffchunk[MAXSRC];
     int linedefined;
-    lua_funcinfo(func, &chunkname, &linedefined);
+    lua_funcinfo(L, func, &chunkname, &linedefined);
     luaL_chunkid(buffchunk, chunkname, sizeof(buffchunk));
     if (level == 2) strcat(buff, "Active Stack:\n");
     strcat(buff, "  ");
@@ -546,7 +548,7 @@ static void errorfb (void) {
       strcat(buff, "...\n");
       break;  /* buffer is full */
     }
-    switch (*lua_getobjname(func, &name)) {
+    switch (*lua_getobjname(L, func, &name)) {
       case 'g':
         sprintf(buff+strlen(buff), "function `%.50s'", name);
         break;
@@ -564,16 +566,16 @@ static void errorfb (void) {
         chunkname = NULL;
       }
     }
-    if ((currentline = lua_currentline(func)) > 0)
+    if ((currentline = lua_currentline(L, func)) > 0)
       sprintf(buff+strlen(buff), " at line %d", currentline);
     if (chunkname)
       sprintf(buff+strlen(buff), " [%.70s]", buffchunk);
     strcat(buff, "\n");
   }
-  func = lua_rawgetglobal("_ALERT");
-  if (lua_isfunction(func)) {  /* avoid error loop if _ALERT is not defined */
-    lua_pushstring(buff);
-    lua_callfunction(func);
+  func = lua_rawgetglobal(L, "_ALERT");
+  if (lua_isfunction(L, func)) {  /* avoid error loop if _ALERT is not defined */
+    lua_pushstring(L, buff);
+    lua_callfunction(L, func);
   }
 }
 
@@ -607,31 +609,31 @@ static const struct luaL_reg iolibtag[] = {
 };
 
 
-static void openwithtags (void) {
+static void openwithtags (lua_State *L) {
   unsigned int i;
-  int iotag = lua_newtag();
-  lua_newtag();  /* alloc CLOSEDTAG: assume that CLOSEDTAG = iotag-1 */
+  int iotag = lua_newtag(L);
+  lua_newtag(L);  /* alloc CLOSEDTAG: assume that CLOSEDTAG = iotag-1 */
   for (i=0; i<sizeof(iolibtag)/sizeof(iolibtag[0]); i++) {
     /* put iotag as upvalue for these functions */
-    lua_pushnumber(iotag);
-    lua_pushcclosure(iolibtag[i].func, 1);
-    lua_setglobal(iolibtag[i].name);
+    lua_pushnumber(L, iotag);
+    lua_pushcclosure(L, iolibtag[i].func, 1);
+    lua_setglobal(L, iolibtag[i].name);
   }
   /* predefined file handles */
-  setfile(stdin, FINPUT, iotag);
-  setfile(stdout, FOUTPUT, iotag);
-  setfile(stdin, "_STDIN", iotag);
-  setfile(stdout, "_STDOUT", iotag);
-  setfile(stderr, "_STDERR", iotag);
+  setfile(L, stdin, FINPUT, iotag);
+  setfile(L, stdout, FOUTPUT, iotag);
+  setfile(L, stdin, "_STDIN", iotag);
+  setfile(L, stdout, "_STDOUT", iotag);
+  setfile(L, stderr, "_STDERR", iotag);
   /* close file when collected */
-  lua_pushnumber(iotag);
-  lua_pushcclosure(gc_close, 1); 
-  lua_settagmethod(iotag, "gc");
+  lua_pushnumber(L, iotag);
+  lua_pushcclosure(L, gc_close, 1); 
+  lua_settagmethod(L, iotag, "gc");
 }
 
-void lua_iolibopen (void) {
+void lua_iolibopen (lua_State *L) {
   /* register lib functions */
-  luaL_openlib(iolib, (sizeof(iolib)/sizeof(iolib[0])));
-  openwithtags();
+  luaL_openlib(L, iolib, (sizeof(iolib)/sizeof(iolib[0])));
+  openwithtags(L);
 }