1 files changed, 380 insertions, 156 deletions

diff --git a/apps/plugins/lua/liolib.c b/apps/plugins/lua/liolib.c
index 7a43915f20..a282dd1ac0 100644
--- a/apps/plugins/lua/liolib.c
+++ b/apps/plugins/lua/liolib.c
@@ -1,10 +1,21 @@
 /*
-** $Id: liolib.c,v 2.73.1.3 2008/01/18 17:47:43 roberto Exp $
+** $Id: liolib.c,v 2.112.1.1 2013/04/12 18:48:47 roberto Exp $
 ** Standard I/O (and system) library
 ** See Copyright Notice in lua.h
 */
 
 
+/*
+** This definition must come before the inclusion of 'stdio.h'; it
+** should not affect non-POSIX systems
+*/
+#if !defined(_FILE_OFFSET_BITS)
+#define _LARGEFILE_SOURCE       1
+#define _FILE_OFFSET_BITS       64
+#endif
+
+
+#include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -19,46 +30,111 @@
 #include "rocklibc.h"
 
 
+#if !defined(lua_checkmode)
 
-#define IO_INPUT    1
-#define IO_OUTPUT   2
+/*
+** Check whether 'mode' matches '[rwa]%+?b?'.
+** Change this macro to accept other modes for 'fopen' besides
+** the standard ones.
+*/
+#define lua_checkmode(mode) \
+        (*mode != '\0' && strchr("rwa", *(mode++)) != NULL &&   \
+        (*mode != '+' || ++mode) &&  /* skip if char is '+' */  \
+        (*mode != 'b' || ++mode) &&  /* skip if char is 'b' */  \
+        (*mode == '\0'))
 
+#endif
 
-static const char *const fnames[] = {"input", "output"};
+/*
+** {======================================================
+** lua_popen spawns a new process connected to the current
+** one through the file streams.
+** =======================================================
+*/
 
+#if !defined(lua_popen) /* { */
 
-static int pushresult (lua_State *L, int i, const char *filename) {
-  int en = errno;
-  if (i) {
-    lua_pushboolean(L, 1);
-    return 1;
-  }
-  else {
-    lua_pushnil(L);
-    if (filename)
-      lua_pushfstring(L, "%s: %s", filename, strerror(en));
-    else
-      lua_pushfstring(L, "%s", strerror(en));
-    lua_pushinteger(L, 0);
-    return 3;
-  }
-}
+#if defined(LUA_USE_POPEN)      /* { */
 
+#define lua_popen(L,c,m)        ((void)L, fflush(NULL), popen(c,m))
+#define lua_pclose(L,file)      ((void)L, pclose(file))
 
-static void fileerror (lua_State *L, int arg, const char *filename) {
-  lua_pushfstring(L, "%s: %s", filename, strerror(errno));
-  luaL_argerror(L, arg, lua_tostring(L, -1));
-}
+#elif defined(LUA_WIN)          /* }{ */
+
+#define lua_popen(L,c,m)                ((void)L, _popen(c,m))
+#define lua_pclose(L,file)              ((void)L, _pclose(file))
+
+
+#else                           /* }{ */
+
+#define lua_popen(L,c,m)                ((void)((void)c, m),  \
+                luaL_error(L, LUA_QL("popen") " not supported"), (FILE*)0)
+#define lua_pclose(L,file)              ((void)((void)L, file), -1)
+
+
+#endif                          /* } */
+
+#endif                  /* } */
+
+/* }====================================================== */
+
+
+/*
+** {======================================================
+** lua_fseek: configuration for longer offsets
+** =======================================================
+*/
+
+#if !defined(lua_fseek) && !defined(LUA_ANSI)   /* { */
+
+#if defined(LUA_USE_POSIX)      /* { */
+
+#define l_fseek(f,o,w)          fseeko(f,o,w)
+#define l_ftell(f)              ftello(f)
+#define l_seeknum               off_t
+
+#elif defined(LUA_WIN) && !defined(_CRTIMP_TYPEINFO) \
+   && defined(_MSC_VER) && (_MSC_VER >= 1400)   /* }{ */
+/* Windows (but not DDK) and Visual C++ 2005 or higher */
+
+#define l_fseek(f,o,w)          _fseeki64(f,o,w)
+#define l_ftell(f)              _ftelli64(f)
+#define l_seeknum               __int64
+
+#endif  /* } */
+
+#endif                  /* } */
+
+
+#if !defined(l_fseek)           /* default definitions */
+#define l_fseek(f,o,w)          fseek(f,o,w)
+#define l_ftell(f)              ftell(f)
+#define l_seeknum               long
+#endif
+
+/* }====================================================== */
+
+
+#define IO_PREFIX       "_IO_"
+#define IO_INPUT        (IO_PREFIX "input")
+#define IO_OUTPUT       (IO_PREFIX "output")
+
+
+typedef luaL_Stream LStream;
+
+
+#define tolstream(L)    ((LStream *)luaL_checkudata(L, 1, LUA_FILEHANDLE))
+
+#define isclosed(p)     ((p)->closef == NULL)
 
 
 static int io_type (lua_State *L) {
-  void *ud;
+  LStream *p;
   luaL_checkany(L, 1);
-  ud = lua_touserdata(L, 1);
-  lua_getfield(L, LUA_REGISTRYINDEX, LUA_FILEHANDLE);
-  if (ud == NULL || !lua_getmetatable(L, 1) || !lua_rawequal(L, -2, -1))
+  p = (LStream *)luaL_testudata(L, 1, LUA_FILEHANDLE);
+  if (p == NULL)
     lua_pushnil(L);  /* not a file */
-  else if (*((int *)ud) < 0)
+  else if (isclosed(p))
     lua_pushliteral(L, "closed file");
   else
     lua_pushliteral(L, "file");
@@ -66,76 +142,97 @@ static int io_type (lua_State *L) {
 }
 
 
-static int* tofile (lua_State *L) {
-  int *f = (int*) luaL_checkudata(L, 1, LUA_FILEHANDLE);
-  if (*f < 0)
-    luaL_error(L, "attempt to use a closed file");
-  return f;
+static int f_tostring (lua_State *L) {
+  LStream *p = tolstream(L);
+  if (isclosed(p))
+    lua_pushliteral(L, "file (closed)");
+  else
+    lua_pushfstring(L, "file (%p)", p->f);
+  return 1;
 }
 
 
+static FILE *tofile (lua_State *L) {
+  LStream *p = tolstream(L);
+  if (isclosed(p))
+    luaL_error(L, "attempt to use a closed file");
+  lua_assert(p->f);
+  return p->f;
+}
+
 
 /*
 ** When creating file handles, always creates a `closed' file handle
 ** before opening the actual file; so, if there is a memory error, the
 ** file is not left opened.
 */
-static int* newfile (lua_State *L) {
-  int *pf = (int *)lua_newuserdata(L, sizeof(int));
-  *pf = -1;  /* file handle is currently `closed' */
-  luaL_getmetatable(L, LUA_FILEHANDLE);
-  lua_setmetatable(L, -2);
-  return pf;
-}
-
-
-/*
-** function to close regular files
-*/
-static int io_fclose (lua_State *L) {
-  int *p = tofile(L);
-  int ok = (rb->close(*p) == 0);
-  *p = -1;
-  return pushresult(L, ok, NULL);
+static LStream *newprefile (lua_State *L) {
+  LStream *p = (LStream *)lua_newuserdata(L, sizeof(LStream));
+  p->closef = NULL;  /* mark file handle as 'closed' */
+  luaL_setmetatable(L, LUA_FILEHANDLE);
+  return p;
 }
 
 
-static inline int aux_close (lua_State *L) {
-  return io_fclose(L);
+static int aux_close (lua_State *L) {
+  LStream *p = tolstream(L);
+  lua_CFunction cf = p->closef;
+  p->closef = NULL;  /* mark stream as closed */
+  return (*cf)(L);  /* close it */
 }
 
 
 static int io_close (lua_State *L) {
-  if (lua_isnone(L, 1))
-    lua_rawgeti(L, LUA_ENVIRONINDEX, IO_OUTPUT);
-  tofile(L);  /* make sure argument is a file */
+  if (lua_isnone(L, 1))  /* no argument? */
+    lua_getfield(L, LUA_REGISTRYINDEX, IO_OUTPUT);  /* use standard output */
+  tofile(L);  /* make sure argument is an open stream */
   return aux_close(L);
 }
 
 
-static int io_gc (lua_State *L) {
-  int f = *(int*) luaL_checkudata(L, 1, LUA_FILEHANDLE);
-  /* ignore closed files */
-  if (f >= 0)
-    aux_close(L);
+static int f_gc (lua_State *L) {
+  LStream *p = tolstream(L);
+  if (!isclosed(p) && p->f != NULL)
+    aux_close(L);  /* ignore closed and incompletely open files */
   return 0;
 }
 
 
-static int io_tostring (lua_State *L) {
-  int f = *(int*) luaL_checkudata(L, 1, LUA_FILEHANDLE);
-  if (f < 0)
-    lua_pushliteral(L, "file (closed)");
-  else
-    lua_pushfstring(L, "file (%d)", f);
-  return 1;
+/*
+** function to close regular files
+*/
+static int io_fclose (lua_State *L) {
+  LStream *p = tolstream(L);
+  int res = rb->close((int)p->f);
+  return luaL_fileresult(L, (res == 0), NULL);
+}
+
+
+static LStream *newfile (lua_State *L) {
+  LStream *p = newprefile(L);
+  p->f = NULL;
+  p->closef = &io_fclose;
+  return p;
+}
+
+
+static void opencheck (lua_State *L, const char *fname, const char *mode) {
+  LStream *p = newfile(L);
+  int flags = O_RDONLY;
+  if (strcmp(mode, "w") == 0)
+    flags = O_WRONLY;
+  p->f = (FILE*)rb->open(fname, flags);
+  if (p->f == NULL)
+    luaL_error(L, "cannot open file " LUA_QS " (%s)", fname, strerror(errno));
 }
 
 
 static int io_open (lua_State *L) {
   const char *filename = luaL_checkstring(L, 1);
   const char *mode = luaL_optstring(L, 2, "r");
-  int *pf = newfile(L);
+  LStream *p = newfile(L);
+  const char *md = mode;  /* to traverse/check mode */
+  luaL_argcheck(L, lua_checkmode(md), 2, "invalid mode");
   int flags = 0;
   if(*(mode+1) == '+') {
     flags = O_RDWR;
@@ -158,84 +255,117 @@ static int io_open (lua_State *L) {
   }
   if((*mode == 'w' || *mode == 'a') && !rb->file_exists(filename))
     flags |= O_CREAT;
-  *pf = rb->open(filename, flags, 0666);
-  return (*pf < 0) ? pushresult(L, 0, filename) : 1;
+  int pf = rb->open(filename, flags, 0666);
+  p->f = (FILE*)pf;
+  return (pf < 0) ? luaL_fileresult(L, 0, filename) : 1;
 }
 
 
-static int* getiofile (lua_State *L, int findex) {
-  int *f;
-  lua_rawgeti(L, LUA_ENVIRONINDEX, findex);
-  f = (int *)lua_touserdata(L, -1);
-  if (f == NULL || *f < 0)
-    luaL_error(L, "standard %s file is closed", fnames[findex - 1]);
-  return f;
+#if 0
+/*
+** function to close 'popen' files
+*/
+static int io_pclose (lua_State *L) {
+  LStream *p = tolstream(L);
+  return luaL_execresult(L, lua_pclose(L, p->f));
 }
 
 
-static int g_iofile (lua_State *L, int f, int flags) {
+static int io_popen (lua_State *L) {
+  const char *filename = luaL_checkstring(L, 1);
+  const char *mode = luaL_optstring(L, 2, "r");
+  LStream *p = newprefile(L);
+  p->f = lua_popen(L, filename, mode);
+  p->closef = &io_pclose;
+  return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;
+}
+
+
+static int io_tmpfile (lua_State *L) {
+  LStream *p = newfile(L);
+  p->f = tmpfile();
+  return (p->f == NULL) ? luaL_fileresult(L, 0, NULL) : 1;
+}
+#endif
+
+
+static FILE *getiofile (lua_State *L, const char *findex) {
+  LStream *p;
+  lua_getfield(L, LUA_REGISTRYINDEX, findex);
+  p = (LStream *)lua_touserdata(L, -1);
+  if (isclosed(p))
+    luaL_error(L, "standard %s file is closed", findex + strlen(IO_PREFIX));
+  return p->f;
+}
+
+
+static int g_iofile (lua_State *L, const char *f, const char *mode) {
   if (!lua_isnoneornil(L, 1)) {
     const char *filename = lua_tostring(L, 1);
-    if (filename) {
-      int *pf = newfile(L);
-      *pf = rb->open(filename, flags);
-      if (*pf < 0)
-        fileerror(L, 1, filename);
-    }
+    if (filename)
+      opencheck(L, filename, mode);
     else {
       tofile(L);  /* check that it's a valid file handle */
       lua_pushvalue(L, 1);
     }
-    lua_rawseti(L, LUA_ENVIRONINDEX, f);
+    lua_setfield(L, LUA_REGISTRYINDEX, f);
   }
   /* return current value */
-  lua_rawgeti(L, LUA_ENVIRONINDEX, f);
+  lua_getfield(L, LUA_REGISTRYINDEX, f);
   return 1;
 }
 
 
 static int io_input (lua_State *L) {
-  return g_iofile(L, IO_INPUT, O_RDONLY);
+  return g_iofile(L, IO_INPUT, "r");
 }
 
 
 static int io_output (lua_State *L) {
-  return g_iofile(L, IO_OUTPUT, O_WRONLY);
+  return g_iofile(L, IO_OUTPUT, "w");
 }
 
 
 static int io_readline (lua_State *L);
 
 
-static void aux_lines (lua_State *L, int idx, int toclose) {
-  lua_pushvalue(L, idx);
+static void aux_lines (lua_State *L, int toclose) {
+  int i;
+  int n = lua_gettop(L) - 1;  /* number of arguments to read */
+  /* ensure that arguments will fit here and into 'io_readline' stack */
+  luaL_argcheck(L, n <= LUA_MINSTACK - 3, LUA_MINSTACK - 3, "too many options");
+  lua_pushvalue(L, 1);  /* file handle */
+  lua_pushinteger(L, n);  /* number of arguments to read */
   lua_pushboolean(L, toclose);  /* close/not close file when finished */
-  lua_pushcclosure(L, io_readline, 2);
+  for (i = 1; i <= n; i++) lua_pushvalue(L, i + 1);  /* copy arguments */
+  lua_pushcclosure(L, io_readline, 3 + n);
 }
 
 
 static int f_lines (lua_State *L) {
   tofile(L);  /* check that it's a valid file handle */
-  aux_lines(L, 1, 0);
+  aux_lines(L, 0);
   return 1;
 }
 
 
 static int io_lines (lua_State *L) {
-  if (lua_isnoneornil(L, 1)) {  /* no arguments? */
-    /* will iterate over default input */
-    lua_rawgeti(L, LUA_ENVIRONINDEX, IO_INPUT);
-    return f_lines(L);
+  int toclose;
+  if (lua_isnone(L, 1)) lua_pushnil(L);  /* at least one argument */
+  if (lua_isnil(L, 1)) {  /* no file name? */
+    lua_getfield(L, LUA_REGISTRYINDEX, IO_INPUT);  /* get default input */
+    lua_replace(L, 1);  /* put it at index 1 */
+    tofile(L);  /* check that it's a valid file handle */
+    toclose = 0;  /* do not close it after iteration */
   }
-  else {
+  else {  /* open a new file */
     const char *filename = luaL_checkstring(L, 1);
-    int *pf = newfile(L);
-    *pf = rb->open(filename, O_RDONLY);
-    if (*pf < 0)
-      fileerror(L, 1, filename);
-    aux_lines(L, lua_gettop(L), 1);
-    return 1;
+    opencheck(L, filename, "r");
+    lua_replace(L, 1);  /* put file at index 1 */
+    toclose = 1;  /* close it after iteration */
   }
+  aux_lines(L, toclose);
+  return 1;
 }
 
 
@@ -245,72 +375,89 @@ static int io_lines (lua_State *L) {
 ** =======================================================
 */
 
-static int read_number (lua_State *L, int *f) {
+
+static int read_number (lua_State *L, FILE *f) {
   lua_Number d;
-  if (PREFIX(fscanf)(*f, LUA_NUMBER_SCAN, &d) == 1) {
+  if (PREFIX(fscanf)(f, LUA_NUMBER_SCAN, &d) == 1) {
     lua_pushnumber(L, d);
     return 1;
   }
-  else return 0;  /* read fails */
+  else {
+   lua_pushnil(L);  /* "result" to be removed */
+   return 0;  /* read fails */
+  }
 }
 
 
-static int test_eof (lua_State *L, int *f) {
-  ssize_t s = rb->lseek(*f, 0, SEEK_CUR);
+static int test_eof (lua_State *L, FILE *f) {
+  ssize_t s = rb->lseek((int)f, 0, SEEK_CUR);
   lua_pushlstring(L, NULL, 0);
-  return s != rb->filesize(*f);
+  return s != rb->filesize((int)f);
 }
 
 
 /* Rockbox already defines read_line() */
-static int _read_line (lua_State *L, int *f) {
+static int _read_line (lua_State *L, FILE *f, int chop) {
   luaL_Buffer b;
   luaL_buffinit(L, &b);
   for (;;) {
     size_t l;
     size_t r;
     char *p = luaL_prepbuffer(&b);
-    r = rb->read_line(*f, p, LUAL_BUFFERSIZE);
+    r = rb->read_line((int)f, p, LUAL_BUFFERSIZE);
     l = strlen(p);
     if (l == 0 || p[l-1] != '\n')
       luaL_addsize(&b, l);
     else {
-      luaL_addsize(&b, l - 1);  /* do not include `eol' */
+      luaL_addsize(&b, l - chop);  /* chop 'eol' if needed */
       luaL_pushresult(&b);  /* close buffer */
       return 1;  /* read at least an `eol' */
     }
     if (r < LUAL_BUFFERSIZE) {  /* eof? */
       luaL_pushresult(&b);  /* close buffer */
-      return (lua_objlen(L, -1) > 0);  /* check whether read something */
+      return (lua_rawlen(L, -1) > 0);  /* check whether read something */
     }
   }
 }
 
 
-static int read_chars (lua_State *L, int *f, size_t n) {
-  size_t rlen;  /* how much to read */
-  size_t nr;  /* number of chars actually read */
+#define MAX_SIZE_T      (~(size_t)0)
+
+static void read_all (lua_State *L, FILE *f) {
+  size_t rlen = LUAL_BUFFERSIZE;  /* how much to read in each cycle */
   luaL_Buffer b;
   luaL_buffinit(L, &b);
-  rlen = LUAL_BUFFERSIZE;  /* try to read that much each time */
-  do {
-    char *p = luaL_prepbuffer(&b);
-    if (rlen > n) rlen = n;  /* cannot read more than asked */
-    nr = rb->read(*f, p, rlen);
+  for (;;) {
+    char *p = luaL_prepbuffsize(&b, rlen);
+    size_t nr = rb->read((int)f, p, rlen);
     luaL_addsize(&b, nr);
-    n -= nr;  /* still have to read `n' chars */
-  } while (n > 0 && nr == rlen);  /* until end of count or eof */
+    if (nr < rlen) break;  /* eof? */
+    else if (rlen <= (MAX_SIZE_T / 4))  /* avoid buffers too large */
+      rlen *= 2;  /* double buffer size at each iteration */
+  }
+  luaL_pushresult(&b);  /* close buffer */
+}
+
+
+static int read_chars (lua_State *L, FILE *f, size_t n) {
+  size_t nr;  /* number of chars actually read */
+  char *p;
+  luaL_Buffer b;
+  luaL_buffinit(L, &b);
+  p = luaL_prepbuffsize(&b, n);  /* prepare buffer to read whole block */
+  nr = rb->read((int)f, p, n);  /* try to read 'n' chars */
+  luaL_addsize(&b, nr);
   luaL_pushresult(&b);  /* close buffer */
-  return (n == 0 || lua_objlen(L, -1) > 0);
+  return (nr > 0);  /* true iff read something */
 }
 
 
-static int g_read (lua_State *L, int *f, int first) {
+static int g_read (lua_State *L, FILE *f, int first) {
   int nargs = lua_gettop(L) - 1;
   int success;
   int n;
   if (nargs == 0) {  /* no arguments? */
-    success = _read_line(L, f);
+    success = _read_line(L, f, 1);
     n = first+1;  /* to return 1 result */
   }
   else {  /* ensure stack space for all results and for auxlib's buffer */
@@ -329,10 +476,13 @@ static int g_read (lua_State *L, int *f, int first) {
             success = read_number(L, f);
             break;
           case 'l':  /* line */
-            success = _read_line(L, f);
+            success = _read_line(L, f, 1);
+            break;
+          case 'L':  /* line with end-of-line */
+            success = _read_line(L, f, 0);
             break;
           case 'a':  /* file */
-            read_chars(L, f, ~((size_t)0));  /* read MAX_SIZE_T chars */
+            read_all(L, f);  /* read entire file */
             success = 1; /* always success */
             break;
           default:
@@ -360,14 +510,24 @@ static int f_read (lua_State *L) {
 
 
 static int io_readline (lua_State *L) {
-  int *f = (int *) lua_touserdata(L, lua_upvalueindex(1));
-  int sucess;
-  if (*f < 0)  /* file is already closed? */
-    luaL_error(L, "file is already closed");
-  sucess = _read_line(L, f);
-  if (sucess) return 1;
-  else {  /* EOF */
-    if (lua_toboolean(L, lua_upvalueindex(2))) {  /* generator created file? */
+  LStream *p = (LStream *)lua_touserdata(L, lua_upvalueindex(1));
+  int i;
+  int n = (int)lua_tointeger(L, lua_upvalueindex(2));
+  if (isclosed(p))  /* file is already closed? */
+    return luaL_error(L, "file is already closed");
+  lua_settop(L , 1);
+  for (i = 1; i <= n; i++)  /* push arguments to 'g_read' */
+    lua_pushvalue(L, lua_upvalueindex(3 + i));
+  n = g_read(L, p->f, 2);  /* 'n' is number of results */
+  lua_assert(n > 0);  /* should return at least a nil */
+  if (!lua_isnil(L, -n))  /* read at least one value? */
+    return n;  /* return them */
+  else {  /* first result is nil: EOF or error */
+    if (n > 1) {  /* is there error information? */
+      /* 2nd result is error message */
+      return luaL_error(L, "%s", lua_tostring(L, -n + 1));
+    }
+    if (lua_toboolean(L, lua_upvalueindex(3))) {  /* generator created file? */
       lua_settop(L, 0);
       lua_pushvalue(L, lua_upvalueindex(1));
       aux_close(L);  /* close it */
@@ -379,22 +539,23 @@ static int io_readline (lua_State *L) {
 /* }====================================================== */
 
 
-static int g_write (lua_State *L, int *f, int arg) {
-  int nargs = lua_gettop(L) - 1;
+static int g_write (lua_State *L, FILE *f, int arg) {
+  int nargs = lua_gettop(L) - arg;
   int status = 1;
   for (; nargs--; arg++) {
     if (lua_type(L, arg) == LUA_TNUMBER) {
       /* optimization: could be done exactly as for strings */
       status = status &&
-          rb->fdprintf(*f, LUA_NUMBER_FMT, lua_tonumber(L, arg)) > 0;
+          rb->fdprintf((int)f, LUA_NUMBER_FMT, lua_tonumber(L, arg)) > 0;
     }
     else {
       size_t l;
       const char *s = luaL_checklstring(L, arg, &l);
-      status = status && (rb->write(*f, s, l) == (ssize_t)l);
+      status = status && (rb->write((int)f, s, l) == (ssize_t)l);
     }
   }
-  return pushresult(L, status, NULL);
+  if (status) return 1;  /* file handle already on stack top */
+  else return luaL_fileresult(L, status, NULL);
 }
 
 
@@ -404,47 +565,86 @@ static int io_write (lua_State *L) {
 
 
 static int f_write (lua_State *L) {
-  return g_write(L, tofile(L), 2);
+  FILE *f = tofile(L);
+  lua_pushvalue(L, 1);  /* push file at the stack top (to be returned) */
+  return g_write(L, f, 2);
 }
 
 
 static int f_seek (lua_State *L) {
   static const int mode[] = {SEEK_SET, SEEK_CUR, SEEK_END};
   static const char *const modenames[] = {"set", "cur", "end", NULL};
-  int f = *tofile(L);
+  FILE *f = tofile(L);
   int op = luaL_checkoption(L, 2, "cur", modenames);
-  long offset = luaL_optlong(L, 3, 0);
-  op = rb->lseek(f, offset, mode[op]);
+  lua_Number p3 = luaL_optnumber(L, 3, 0);
+  l_seeknum offset = (l_seeknum)p3;
+  luaL_argcheck(L, (lua_Number)offset == p3, 3,
+                  "not an integer in proper range");
+  op = rb->lseek((int)f, offset, mode[op]);
   if (op)
-    return pushresult(L, 0, NULL);  /* error */
+    return luaL_fileresult(L, 0, NULL);  /* error */
   else {
-    lua_pushinteger(L, rb->lseek(f, 0, SEEK_CUR));
+    lua_pushnumber(L, (lua_Number)rb->lseek((int)f, 0, SEEK_CUR));
     return 1;
   }
 }
 
+#if 0
+static int f_setvbuf (lua_State *L) {
+  static const int mode[] = {_IONBF, _IOFBF, _IOLBF};
+  static const char *const modenames[] = {"no", "full", "line", NULL};
+  FILE *f = tofile(L);
+  int op = luaL_checkoption(L, 2, NULL, modenames);
+  lua_Integer sz = luaL_optinteger(L, 3, LUAL_BUFFERSIZE);
+  int res = setvbuf(f, NULL, mode[op], sz);
+  return luaL_fileresult(L, res == 0, NULL);
+}
+
 
+
+static int io_flush (lua_State *L) {
+  return luaL_fileresult(L, fflush(getiofile(L, IO_OUTPUT)) == 0, NULL);
+}
+
+
+static int f_flush (lua_State *L) {
+  return luaL_fileresult(L, fflush(tofile(L)) == 0, NULL);
+}
+#endif
+
+
+/*
+** functions for 'io' library
+*/
 static const luaL_Reg iolib[] = {
   {"close", io_close},
+  /*{"flush", io_flush},*/
   {"input", io_input},
   {"lines", io_lines},
   {"open", io_open},
   {"output", io_output},
+  /*{"popen", io_popen},*/
   {"read", io_read},
+  /*{"tmpfile", io_tmpfile},*/
   {"type", io_type},
   {"write", io_write},
   {NULL, NULL}
 };
 
 
+/*
+** methods for file handles
+*/
 static const luaL_Reg flib[] = {
   {"close", io_close},
+  /*{"flush", f_flush},*/
   {"lines", f_lines},
   {"read", f_read},
   {"seek", f_seek},
+  /*{"setvbuf", f_setvbuf},*/
   {"write", f_write},
-  {"__gc", io_gc},
-  {"__tostring", io_tostring},
+  {"__gc", f_gc},
+  {"__tostring", f_tostring},
   {NULL, NULL}
 };
 
@@ -453,16 +653,40 @@ static void createmeta (lua_State *L) {
   luaL_newmetatable(L, LUA_FILEHANDLE);  /* create metatable for file handles */
   lua_pushvalue(L, -1);  /* push metatable */
   lua_setfield(L, -2, "__index");  /* metatable.__index = metatable */
-  luaL_register(L, NULL, flib);  /* file methods */
+  luaL_setfuncs(L, flib, 0);  /* add file methods to new metatable */
+  lua_pop(L, 1);  /* pop new metatable */
 }
 
 
-LUALIB_API int luaopen_io (lua_State *L) {
+/*
+** function to (not) close the standard files stdin, stdout, and stderr
+*/
+#if 0
+static int io_noclose (lua_State *L) {
+  LStream *p = tolstream(L);
+  p->closef = &io_noclose;  /* keep file opened */
+  lua_pushnil(L);
+  lua_pushliteral(L, "cannot close standard file");
+  return 2;
+}
+
+
+static void createstdfile (lua_State *L, FILE *f, const char *k,
+                           const char *fname) {
+  LStream *p = newprefile(L);
+  p->f = f;
+  p->closef = &io_noclose;
+  if (k != NULL) {
+    lua_pushvalue(L, -1);
+    lua_setfield(L, LUA_REGISTRYINDEX, k);  /* add file to registry */
+  }
+  lua_setfield(L, -2, fname);  /* add file to module */
+}
+#endif
+
+LUAMOD_API int luaopen_io (lua_State *L) {
+  luaL_newlib(L, iolib);  /* new module */
   createmeta(L);
-  lua_replace(L, LUA_ENVIRONINDEX);
-  /* open library */
-  luaL_register(L, LUA_IOLIBNAME, iolib);
   /* create (and set) default files */
-  lua_pop(L, 1);  /* pop environment for default files */
   return 1;
 }