diff --git a/dlls/msvcp90/ios.c b/dlls/msvcp90/ios.c
index 6bafa95e301..9062760fd52 100644
--- a/dlls/msvcp90/ios.c
+++ b/dlls/msvcp90/ios.c
@@ -29,97 +29,11 @@
 #include "wine/debug.h"
 WINE_DEFAULT_DEBUG_CHANNEL(msvcp90);
 
-typedef enum {
-    IOSTATE_goodbit   = 0x00,
-    IOSTATE_eofbit    = 0x01,
-    IOSTATE_failbit   = 0x02,
-    IOSTATE_badbit    = 0x04,
-    IOSTATE__Hardfail = 0x10,
-    IOSTATE_mask      = 0x17
-} IOSB_iostate;
-
-typedef enum {
-    FMTFLAG_skipws      = 0x0001,
-    FMTFLAG_unitbuf     = 0x0002,
-    FMTFLAG_uppercase   = 0x0004,
-    FMTFLAG_showbase    = 0x0008,
-    FMTFLAG_showpoint   = 0x0010,
-    FMTFLAG_showpos     = 0x0020,
-    FMTFLAG_left        = 0x0040,
-    FMTFLAG_right       = 0x0080,
-    FMTFLAG_internal    = 0x0100,
-    FMTFLAG_dec         = 0x0200,
-    FMTFLAG_oct         = 0x0400,
-    FMTFLAG_hex         = 0x0800,
-    FMTFLAG_scientific  = 0x1000,
-    FMTFLAG_fixed       = 0x2000,
-    FMTFLAG_hexfloat    = 0x3000,
-    FMTFLAG_boolalpha   = 0x4000,
-    FMTFLAG_stdio       = 0x8000,
-    FMTFLAG_adjustfield = FMTFLAG_left|FMTFLAG_right|FMTFLAG_internal,
-    FMTFLAG_basefield   = FMTFLAG_dec|FMTFLAG_oct|FMTFLAG_hex,
-    FMTFLAG_floadfield  = FMTFLAG_scientific|FMTFLAG_fixed,
-    FMTFLAG_mask        = 0xffff
-} IOSB_fmtflags;
-
-typedef enum {
-    OPENMODE_in         = 0x01,
-    OPENMODE_out        = 0x02,
-    OPENMODE_ate        = 0x04,
-    OPENMODE_app        = 0x08,
-    OPENMODE_trunc      = 0x10,
-    OPENMODE__Nocreate  = 0x40,
-    OPENMODE__Noreplace = 0x80,
-    OPENMODE_binary     = 0x20,
-    OPENMODE_mask       = 0xff
-} IOSB_openmode;
-
-typedef enum {
-    SEEKDIR_beg  = 0x1,
-    SEEKDIR_cur  = 0x2,
-    SEEKDIR_end  = 0x3,
-    SEEKDIR_mask = 0x3
-} IOSB_seekdir;
-
-typedef struct _iosarray {
-    struct _iosarray *next;
-    int index;
-    int long_val;
-    void *ptr_val;
-} IOS_BASE_iosarray;
-
-typedef enum {
-    EVENT_erase_event,
-    EVENT_imbue_event,
-    EVENT_copyfmt_event
-} IOS_BASE_event;
-
-struct _ios_base;
-typedef void (CDECL *IOS_BASE_event_callback)(IOS_BASE_event, struct _ios_base*, int);
-typedef struct _fnarray {
-    struct _fnarray *next;
-    int index;
-    IOS_BASE_event_callback event_handler;
-} IOS_BASE_fnarray;
-
 /* ?_Index@ios_base@std@@0HA */
 int ios_base_Index = 0;
 /* ?_Sync@ios_base@std@@0_NA */
 MSVCP_bool ios_base_Sync = FALSE;
 
-typedef struct _ios_base {
-    const vtable_ptr *vtable;
-    MSVCP_size_t stdstr;
-    IOSB_iostate state;
-    IOSB_iostate except;
-    IOSB_fmtflags fmtfl;
-    streamsize prec;
-    streamsize wide;
-    IOS_BASE_iosarray *arr;
-    IOS_BASE_fnarray *calls;
-    locale *loc;
-} ios_base;
-
 typedef struct {
     streamoff off;
     __int64 DECLSPEC_ALIGN(8) pos;
diff --git a/dlls/msvcp90/locale.c b/dlls/msvcp90/locale.c
index fd0c7cb8995..ca26378b743 100644
--- a/dlls/msvcp90/locale.c
+++ b/dlls/msvcp90/locale.c
@@ -102,7 +102,6 @@ typedef struct {
     _Cvtvec cvt;
 } num_get;
 
-struct _ios_base;
 typedef struct _istreambuf_iterator_char
 {
     struct _basic_streambuf_char *strbuf;
@@ -4118,7 +4117,7 @@ int __cdecl num_get_wchar__Getffld(num_get *this, char *dest, istreambuf_iterato
 /* ?_Getffldx@?$num_get@GV?$istreambuf_iterator@GU?$char_traits@G@std@@@std@@@std@@ABAHPADAAV?$istreambuf_iterator@GU?$char_traits@G@std@@@2@1AAVios_base@2@PAH@Z */
 /* ?_Getffldx@?$num_get@GV?$istreambuf_iterator@GU?$char_traits@G@std@@@std@@@std@@AEBAHPEADAEAV?$istreambuf_iterator@GU?$char_traits@G@std@@@2@1AEAVios_base@2@PEAH@Z */
 int __cdecl num_get_wchar__Getffldx(num_get *this, char *dest, istreambuf_iterator_wchar *first,
-    istreambuf_iterator_wchar *last, struct _ios_base *ios, int *phexexp)
+    istreambuf_iterator_wchar *last, ios_base *ios, int *phexexp)
 {
     FIXME("(%p %p %p %p %p) stub\n", dest, first, last, ios, phexexp);
     return -1;
@@ -4152,7 +4151,7 @@ int __thiscall MSVCP_num_get_wchar__Hexdig(num_get *this, wchar_t dig, wchar_t e
 /* ?do_get@?$num_get@GV?$istreambuf_iterator@GU?$char_traits@G@std@@@std@@@std@@MEBA?AV?$istreambuf_iterator@GU?$char_traits@G@std@@@2@V32@0AEAVios_base@2@AEAHAEAPEAX@Z */
 DEFINE_THISCALL_WRAPPER(num_get_wchar_do_get_void,36)
 istreambuf_iterator_wchar *__thiscall num_get_wchar_do_get_void(const num_get *this, istreambuf_iterator_wchar *ret,
-    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, struct _ios_base *base, int *state, void **pval)
+    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, ios_base *base, int *state, void **pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4164,7 +4163,7 @@ istreambuf_iterator_wchar *__thiscall num_get_wchar_do_get_void(const num_get *t
 /* ?get@?$num_get@GV?$istreambuf_iterator@GU?$char_traits@G@std@@@std@@@std@@QEBA?AV?$istreambuf_iterator@GU?$char_traits@G@std@@@2@V32@0AEAVios_base@2@AEAHAEAPEAX@Z */
 DEFINE_THISCALL_WRAPPER(num_get_wchar_get_void,36)
 istreambuf_iterator_wchar *__thiscall num_get_wchar_get_void(const num_get *this, istreambuf_iterator_wchar *ret,
-    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, struct _ios_base *base, int *state, void **pval)
+    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, ios_base *base, int *state, void **pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4180,7 +4179,7 @@ istreambuf_iterator_wchar *__thiscall num_get_wchar_get_void(const num_get *this
 /* ?do_get@?$num_get@GV?$istreambuf_iterator@GU?$char_traits@G@std@@@std@@@std@@MEBA?AV?$istreambuf_iterator@GU?$char_traits@G@std@@@2@V32@0AEAVios_base@2@AEAHAEAN@Z */
 DEFINE_THISCALL_WRAPPER(num_get_wchar_do_get_double,36)
 istreambuf_iterator_wchar *__thiscall num_get_wchar_do_get_double(const num_get *this, istreambuf_iterator_wchar *ret,
-    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, struct _ios_base *base, int *state, double *pval)
+    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, ios_base *base, int *state, double *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4192,7 +4191,7 @@ istreambuf_iterator_wchar *__thiscall num_get_wchar_do_get_double(const num_get
 /* ?get@?$num_get@GV?$istreambuf_iterator@GU?$char_traits@G@std@@@std@@@std@@QEBA?AV?$istreambuf_iterator@GU?$char_traits@G@std@@@2@V32@0AEAVios_base@2@AEAHAEAO@Z */
 DEFINE_THISCALL_WRAPPER(num_get_wchar_get_ldouble,36)
 istreambuf_iterator_wchar *__thiscall num_get_wchar_get_ldouble(const num_get *this, istreambuf_iterator_wchar *ret,
-        istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, struct _ios_base *base, int *state, double *pval)
+        istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, ios_base *base, int *state, double *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4204,7 +4203,7 @@ istreambuf_iterator_wchar *__thiscall num_get_wchar_get_ldouble(const num_get *t
 /* ?get@?$num_get@GV?$istreambuf_iterator@GU?$char_traits@G@std@@@std@@@std@@QEBA?AV?$istreambuf_iterator@GU?$char_traits@G@std@@@2@V32@0AEAVios_base@2@AEAHAEAN@Z */
 DEFINE_THISCALL_WRAPPER(num_get_wchar_get_double,36)
 istreambuf_iterator_wchar *__thiscall num_get_wchar_get_double(const num_get *this, istreambuf_iterator_wchar *ret,
-    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, struct _ios_base *base, int *state, double *pval)
+    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, ios_base *base, int *state, double *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4216,7 +4215,7 @@ istreambuf_iterator_wchar *__thiscall num_get_wchar_get_double(const num_get *th
 /* ?do_get@?$num_get@GV?$istreambuf_iterator@GU?$char_traits@G@std@@@std@@@std@@MEBA?AV?$istreambuf_iterator@GU?$char_traits@G@std@@@2@V32@0AEAVios_base@2@AEAHAEAM@Z */
 DEFINE_THISCALL_WRAPPER(num_get_wchar_do_get_float,36)
 istreambuf_iterator_wchar *__thiscall num_get_wchar_do_get_float(const num_get *this, istreambuf_iterator_wchar *ret,
-    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, struct _ios_base *base, int *state, float *pval)
+    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, ios_base *base, int *state, float *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4228,7 +4227,7 @@ istreambuf_iterator_wchar *__thiscall num_get_wchar_do_get_float(const num_get *
 /* ?get@?$num_get@GV?$istreambuf_iterator@GU?$char_traits@G@std@@@std@@@std@@QEBA?AV?$istreambuf_iterator@GU?$char_traits@G@std@@@2@V32@0AEAVios_base@2@AEAHAEAM@Z */
 DEFINE_THISCALL_WRAPPER(num_get_wchar_get_float,36)
 istreambuf_iterator_wchar *__thiscall num_get_wchar_get_float(const num_get *this, istreambuf_iterator_wchar *ret,
-    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, struct _ios_base *base, int *state, float *pval)
+    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, ios_base *base, int *state, float *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4240,7 +4239,7 @@ istreambuf_iterator_wchar *__thiscall num_get_wchar_get_float(const num_get *thi
 /* ?do_get@?$num_get@GV?$istreambuf_iterator@GU?$char_traits@G@std@@@std@@@std@@MEBA?AV?$istreambuf_iterator@GU?$char_traits@G@std@@@2@V32@0AEAVios_base@2@AEAHAEA_K@Z */
 DEFINE_THISCALL_WRAPPER(num_get_wchar_do_get_uint64,36)
 istreambuf_iterator_wchar *__thiscall num_get_wchar_do_get_uint64(const num_get *this, istreambuf_iterator_wchar *ret,
-    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, struct _ios_base *base, int *state, ULONGLONG *pval)
+    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, ios_base *base, int *state, ULONGLONG *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4252,7 +4251,7 @@ istreambuf_iterator_wchar *__thiscall num_get_wchar_do_get_uint64(const num_get
 /* ?get@?$num_get@GV?$istreambuf_iterator@GU?$char_traits@G@std@@@std@@@std@@QEBA?AV?$istreambuf_iterator@GU?$char_traits@G@std@@@2@V32@0AEAVios_base@2@AEAHAEA_K@Z */
 DEFINE_THISCALL_WRAPPER(num_get_wchar_get_uint64,36)
 istreambuf_iterator_wchar *__thiscall num_get_wchar_get_uint64(const num_get *this, istreambuf_iterator_wchar *ret,
-    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, struct _ios_base *base, int *state, ULONGLONG *pval)
+    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, ios_base *base, int *state, ULONGLONG *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4264,7 +4263,7 @@ istreambuf_iterator_wchar *__thiscall num_get_wchar_get_uint64(const num_get *th
 /* ?do_get@?$num_get@GV?$istreambuf_iterator@GU?$char_traits@G@std@@@std@@@std@@MEBA?AV?$istreambuf_iterator@GU?$char_traits@G@std@@@2@V32@0AEAVios_base@2@AEAHAEA_J@Z */
 DEFINE_THISCALL_WRAPPER(num_get_wchar_do_get_int64,36)
 istreambuf_iterator_wchar *__thiscall num_get_wchar_do_get_int64(const num_get *this, istreambuf_iterator_wchar *ret,
-    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, struct _ios_base *base, int *state, LONGLONG *pval)
+    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, ios_base *base, int *state, LONGLONG *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4276,7 +4275,7 @@ istreambuf_iterator_wchar *__thiscall num_get_wchar_do_get_int64(const num_get *
 /* ?get@?$num_get@GV?$istreambuf_iterator@GU?$char_traits@G@std@@@std@@@std@@QEBA?AV?$istreambuf_iterator@GU?$char_traits@G@std@@@2@V32@0AEAVios_base@2@AEAHAEA_J@Z */
 DEFINE_THISCALL_WRAPPER(num_get_wchar_get_int64,36)
 istreambuf_iterator_wchar *__thiscall num_get_wchar_get_int64(const num_get *this, istreambuf_iterator_wchar *ret,
-    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, struct _ios_base *base, int *state, LONGLONG *pval)
+    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, ios_base *base, int *state, LONGLONG *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4288,7 +4287,7 @@ istreambuf_iterator_wchar *__thiscall num_get_wchar_get_int64(const num_get *thi
 /* ?do_get@?$num_get@GV?$istreambuf_iterator@GU?$char_traits@G@std@@@std@@@std@@MEBA?AV?$istreambuf_iterator@GU?$char_traits@G@std@@@2@V32@0AEAVios_base@2@AEAHAEAK@Z */
 DEFINE_THISCALL_WRAPPER(num_get_wchar_do_get_ulong,36)
 istreambuf_iterator_wchar *__thiscall num_get_wchar_do_get_ulong(const num_get *this, istreambuf_iterator_wchar *ret,
-    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, struct _ios_base *base, int *state, ULONG *pval)
+    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, ios_base *base, int *state, ULONG *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4300,7 +4299,7 @@ istreambuf_iterator_wchar *__thiscall num_get_wchar_do_get_ulong(const num_get *
 /* ?get@?$num_get@GV?$istreambuf_iterator@GU?$char_traits@G@std@@@std@@@std@@QEBA?AV?$istreambuf_iterator@GU?$char_traits@G@std@@@2@V32@0AEAVios_base@2@AEAHAEAK@Z */
 DEFINE_THISCALL_WRAPPER(num_get_wchar_get_ulong,36)
 istreambuf_iterator_wchar *__thiscall num_get_wchar_get_ulong(const num_get *this, istreambuf_iterator_wchar *ret,
-    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, struct _ios_base *base, int *state, ULONG *pval)
+    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, ios_base *base, int *state, ULONG *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4312,7 +4311,7 @@ istreambuf_iterator_wchar *__thiscall num_get_wchar_get_ulong(const num_get *thi
 /* ?do_get@?$num_get@GV?$istreambuf_iterator@GU?$char_traits@G@std@@@std@@@std@@MEBA?AV?$istreambuf_iterator@GU?$char_traits@G@std@@@2@V32@0AEAVios_base@2@AEAHAEAJ@Z */
 DEFINE_THISCALL_WRAPPER(num_get_wchar_do_get_long,36)
 istreambuf_iterator_wchar *__thiscall num_get_wchar_do_get_long(const num_get *this, istreambuf_iterator_wchar *ret,
-    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, struct _ios_base *base, int *state, LONG *pval)
+    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, ios_base *base, int *state, LONG *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4324,7 +4323,7 @@ istreambuf_iterator_wchar *__thiscall num_get_wchar_do_get_long(const num_get *t
 /* ?get@?$num_get@GV?$istreambuf_iterator@GU?$char_traits@G@std@@@std@@@std@@QEBA?AV?$istreambuf_iterator@GU?$char_traits@G@std@@@2@V32@0AEAVios_base@2@AEAHAEAJ@Z */
 DEFINE_THISCALL_WRAPPER(num_get_wchar_get_long,36)
 istreambuf_iterator_wchar *__thiscall num_get_wchar_get_long(const num_get *this, istreambuf_iterator_wchar *ret,
-    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, struct _ios_base *base, int *state, LONG *pval)
+    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, ios_base *base, int *state, LONG *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4336,7 +4335,7 @@ istreambuf_iterator_wchar *__thiscall num_get_wchar_get_long(const num_get *this
 /* ?do_get@?$num_get@GV?$istreambuf_iterator@GU?$char_traits@G@std@@@std@@@std@@MEBA?AV?$istreambuf_iterator@GU?$char_traits@G@std@@@2@V32@0AEAVios_base@2@AEAHAEAI@Z */
 DEFINE_THISCALL_WRAPPER(num_get_wchar_do_get_uint,36)
 istreambuf_iterator_wchar *__thiscall num_get_wchar_do_get_uint(const num_get *this, istreambuf_iterator_wchar *ret,
-    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, struct _ios_base *base, int *state, unsigned int *pval)
+    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, ios_base *base, int *state, unsigned int *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4348,7 +4347,7 @@ istreambuf_iterator_wchar *__thiscall num_get_wchar_do_get_uint(const num_get *t
 /* ?get@?$num_get@GV?$istreambuf_iterator@GU?$char_traits@G@std@@@std@@@std@@QEBA?AV?$istreambuf_iterator@GU?$char_traits@G@std@@@2@V32@0AEAVios_base@2@AEAHAEAI@Z */
 DEFINE_THISCALL_WRAPPER(num_get_wchar_get_uint,36)
 istreambuf_iterator_wchar *__thiscall num_get_wchar_get_uint(const num_get *this, istreambuf_iterator_wchar *ret,
-    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, struct _ios_base *base, int *state, unsigned int *pval)
+    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, ios_base *base, int *state, unsigned int *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4360,7 +4359,7 @@ istreambuf_iterator_wchar *__thiscall num_get_wchar_get_uint(const num_get *this
 /* ?do_get@?$num_get@GV?$istreambuf_iterator@GU?$char_traits@G@std@@@std@@@std@@MEBA?AV?$istreambuf_iterator@GU?$char_traits@G@std@@@2@V32@0AEAVios_base@2@AEAHAEAG@Z */
 DEFINE_THISCALL_WRAPPER(num_get_wchar_do_get_ushort,36)
 istreambuf_iterator_wchar *__thiscall num_get_wchar_do_get_ushort(const num_get *this, istreambuf_iterator_wchar *ret,
-    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, struct _ios_base *base, int *state, unsigned short *pval)
+    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, ios_base *base, int *state, unsigned short *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4372,7 +4371,7 @@ istreambuf_iterator_wchar *__thiscall num_get_wchar_do_get_ushort(const num_get
 /* ?get@?$num_get@GV?$istreambuf_iterator@GU?$char_traits@G@std@@@std@@@std@@QEBA?AV?$istreambuf_iterator@GU?$char_traits@G@std@@@2@V32@0AEAVios_base@2@AEAHAEAG@Z */
 DEFINE_THISCALL_WRAPPER(num_get_wchar_get_ushort,36)
 istreambuf_iterator_wchar *__thiscall num_get_wchar_get_ushort(const num_get *this, istreambuf_iterator_wchar *ret,
-    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, struct _ios_base *base, int *state, unsigned short *pval)
+    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, ios_base *base, int *state, unsigned short *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4384,7 +4383,7 @@ istreambuf_iterator_wchar *__thiscall num_get_wchar_get_ushort(const num_get *th
 /* ?do_get@?$num_get@GV?$istreambuf_iterator@GU?$char_traits@G@std@@@std@@@std@@MEBA?AV?$istreambuf_iterator@GU?$char_traits@G@std@@@2@V32@0AEAVios_base@2@AEAHAEA_N@Z */
 DEFINE_THISCALL_WRAPPER(num_get_wchar_do_get_bool,36)
 istreambuf_iterator_wchar *__thiscall num_get_wchar_do_get_bool(const num_get *this, istreambuf_iterator_wchar *ret,
-    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, struct _ios_base *base, int *state, MSVCP_bool *pval)
+    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, ios_base *base, int *state, MSVCP_bool *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4396,7 +4395,7 @@ istreambuf_iterator_wchar *__thiscall num_get_wchar_do_get_bool(const num_get *t
 /* ?get@?$num_get@GV?$istreambuf_iterator@GU?$char_traits@G@std@@@std@@@std@@QEBA?AV?$istreambuf_iterator@GU?$char_traits@G@std@@@2@V32@0AEAVios_base@2@AEAHAEA_N@Z */
 DEFINE_THISCALL_WRAPPER(num_get_wchar_get_bool,36)
 istreambuf_iterator_wchar *__thiscall num_get_wchar_get_bool(const num_get *this, istreambuf_iterator_wchar *ret,
-    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, struct _ios_base *base, int *state, MSVCP_bool *pval)
+    istreambuf_iterator_wchar first, istreambuf_iterator_wchar last, ios_base *base, int *state, MSVCP_bool *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4492,7 +4491,7 @@ int __cdecl num_get_char__Getffld(num_get *this, char *dest, istreambuf_iterator
 /* ?_Getffldx@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@ABAHPADAAV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@1AAVios_base@2@PAH@Z */
 /* ?_Getffldx@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@AEBAHPEADAEAV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@1AEAVios_base@2@PEAH@Z */
 int __cdecl num_get_char__Getffldx(num_get *this, char *dest, istreambuf_iterator_char *first,
-    istreambuf_iterator_char *last, struct _ios_base *ios, int *phexexp)
+    istreambuf_iterator_char *last, ios_base *ios, int *phexexp)
 {
     FIXME("(%p %p %p %p %p) stub\n", dest, first, last, ios, phexexp);
     return -1;
@@ -4520,7 +4519,7 @@ int __thiscall MSVCP_num_get_char__Hexdig(num_get *this, char dig, char e0, char
 /* ?do_get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@MEBA?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AEAVios_base@2@AEAHAEAPEAX@Z */
 DEFINE_THISCALL_WRAPPER(num_get_char_do_get_void,36)
 istreambuf_iterator_char *__thiscall num_get_char_do_get_void(const num_get *this, istreambuf_iterator_char *ret,
-    istreambuf_iterator_char first, istreambuf_iterator_char last, struct _ios_base *base, int *state, void **pval)
+    istreambuf_iterator_char first, istreambuf_iterator_char last, ios_base *base, int *state, void **pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4530,7 +4529,7 @@ istreambuf_iterator_char *__thiscall num_get_char_do_get_void(const num_get *thi
 /* ?get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@QEBA?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AEAVios_base@2@AEAHAEAPEAX@Z */
 DEFINE_THISCALL_WRAPPER(num_get_char_get_void,36)
 istreambuf_iterator_char *__thiscall num_get_char_get_void(const num_get *this, istreambuf_iterator_char *ret,
-    istreambuf_iterator_char first, istreambuf_iterator_char last, struct _ios_base *base, int *state, void **pval)
+    istreambuf_iterator_char first, istreambuf_iterator_char last, ios_base *base, int *state, void **pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4542,7 +4541,7 @@ istreambuf_iterator_char *__thiscall num_get_char_get_void(const num_get *this,
 /* ?do_get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@MEBA?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AEAVios_base@2@AEAHAEAN@Z */
 DEFINE_THISCALL_WRAPPER(num_get_char_do_get_double,36)
 istreambuf_iterator_char *__thiscall num_get_char_do_get_double(const num_get *this, istreambuf_iterator_char *ret,
-    istreambuf_iterator_char first, istreambuf_iterator_char last, struct _ios_base *base, int *state, double *pval)
+    istreambuf_iterator_char first, istreambuf_iterator_char last, ios_base *base, int *state, double *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4552,7 +4551,7 @@ istreambuf_iterator_char *__thiscall num_get_char_do_get_double(const num_get *t
 /* ?get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@QEBA?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AEAVios_base@2@AEAHAEAO@Z */
 DEFINE_THISCALL_WRAPPER(num_get_char_get_ldouble,36)
 istreambuf_iterator_char *__thiscall num_get_char_get_ldouble(const num_get *this, istreambuf_iterator_char *ret,
-        istreambuf_iterator_char first, istreambuf_iterator_char last, struct _ios_base *base, int *state, double *pval)
+        istreambuf_iterator_char first, istreambuf_iterator_char last, ios_base *base, int *state, double *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4562,7 +4561,7 @@ istreambuf_iterator_char *__thiscall num_get_char_get_ldouble(const num_get *thi
 /* ?get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@QEBA?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AEAVios_base@2@AEAHAEAN@Z */
 DEFINE_THISCALL_WRAPPER(num_get_char_get_double,36)
 istreambuf_iterator_char *__thiscall num_get_char_get_double(const num_get *this, istreambuf_iterator_char *ret,
-    istreambuf_iterator_char first, istreambuf_iterator_char last, struct _ios_base *base, int *state, double *pval)
+    istreambuf_iterator_char first, istreambuf_iterator_char last, ios_base *base, int *state, double *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4572,7 +4571,7 @@ istreambuf_iterator_char *__thiscall num_get_char_get_double(const num_get *this
 /* ?do_get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@MEBA?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AEAVios_base@2@AEAHAEAM@Z */
 DEFINE_THISCALL_WRAPPER(num_get_char_do_get_float,36)
 istreambuf_iterator_char *__thiscall num_get_char_do_get_float(const num_get *this, istreambuf_iterator_char *ret,
-    istreambuf_iterator_char first, istreambuf_iterator_char last, struct _ios_base *base, int *state, float *pval)
+    istreambuf_iterator_char first, istreambuf_iterator_char last, ios_base *base, int *state, float *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4582,7 +4581,7 @@ istreambuf_iterator_char *__thiscall num_get_char_do_get_float(const num_get *th
 /* ?get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@QEBA?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AEAVios_base@2@AEAHAEAM@Z */
 DEFINE_THISCALL_WRAPPER(num_get_char_get_float,36)
 istreambuf_iterator_char *__thiscall num_get_char_get_float(const num_get *this, istreambuf_iterator_char *ret,
-    istreambuf_iterator_char first, istreambuf_iterator_char last, struct _ios_base *base, int *state, float *pval)
+    istreambuf_iterator_char first, istreambuf_iterator_char last, ios_base *base, int *state, float *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4592,7 +4591,7 @@ istreambuf_iterator_char *__thiscall num_get_char_get_float(const num_get *this,
 /* ?do_get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@MEBA?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AEAVios_base@2@AEAHAEA_K@Z */
 DEFINE_THISCALL_WRAPPER(num_get_char_do_get_uint64,36)
 istreambuf_iterator_char *__thiscall num_get_char_do_get_uint64(const num_get *this, istreambuf_iterator_char *ret,
-    istreambuf_iterator_char first, istreambuf_iterator_char last, struct _ios_base *base, int *state, ULONGLONG *pval)
+    istreambuf_iterator_char first, istreambuf_iterator_char last, ios_base *base, int *state, ULONGLONG *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4602,7 +4601,7 @@ istreambuf_iterator_char *__thiscall num_get_char_do_get_uint64(const num_get *t
 /* ?get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@QEBA?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AEAVios_base@2@AEAHAEA_K@Z */
 DEFINE_THISCALL_WRAPPER(num_get_char_get_uint64,36)
 istreambuf_iterator_char *__thiscall num_get_char_get_uint64(const num_get *this, istreambuf_iterator_char *ret,
-    istreambuf_iterator_char first, istreambuf_iterator_char last, struct _ios_base *base, int *state, ULONGLONG *pval)
+    istreambuf_iterator_char first, istreambuf_iterator_char last, ios_base *base, int *state, ULONGLONG *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4612,7 +4611,7 @@ istreambuf_iterator_char *__thiscall num_get_char_get_uint64(const num_get *this
 /* ?do_get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@MEBA?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AEAVios_base@2@AEAHAEA_J@Z */
 DEFINE_THISCALL_WRAPPER(num_get_char_do_get_int64,36)
 istreambuf_iterator_char *__thiscall num_get_char_do_get_int64(const num_get *this, istreambuf_iterator_char *ret,
-    istreambuf_iterator_char first, istreambuf_iterator_char last, struct _ios_base *base, int *state, LONGLONG *pval)
+    istreambuf_iterator_char first, istreambuf_iterator_char last, ios_base *base, int *state, LONGLONG *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4622,7 +4621,7 @@ istreambuf_iterator_char *__thiscall num_get_char_do_get_int64(const num_get *th
 /* ?get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@QEBA?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AEAVios_base@2@AEAHAEA_J@Z */
 DEFINE_THISCALL_WRAPPER(num_get_char_get_int64,36)
 istreambuf_iterator_char *__thiscall num_get_char_get_int64(const num_get *this, istreambuf_iterator_char *ret,
-    istreambuf_iterator_char first, istreambuf_iterator_char last, struct _ios_base *base, int *state, LONGLONG *pval)
+    istreambuf_iterator_char first, istreambuf_iterator_char last, ios_base *base, int *state, LONGLONG *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4632,7 +4631,7 @@ istreambuf_iterator_char *__thiscall num_get_char_get_int64(const num_get *this,
 /* ?do_get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@MEBA?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AEAVios_base@2@AEAHAEAK@Z */
 DEFINE_THISCALL_WRAPPER(num_get_char_do_get_ulong,36)
 istreambuf_iterator_char *__thiscall num_get_char_do_get_ulong(const num_get *this, istreambuf_iterator_char *ret,
-    istreambuf_iterator_char first, istreambuf_iterator_char last, struct _ios_base *base, int *state, ULONG *pval)
+    istreambuf_iterator_char first, istreambuf_iterator_char last, ios_base *base, int *state, ULONG *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4642,7 +4641,7 @@ istreambuf_iterator_char *__thiscall num_get_char_do_get_ulong(const num_get *th
 /* ?get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@QEBA?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AEAVios_base@2@AEAHAEAK@Z */
 DEFINE_THISCALL_WRAPPER(num_get_char_get_ulong,36)
 istreambuf_iterator_char *__thiscall num_get_char_get_ulong(const num_get *this, istreambuf_iterator_char *ret,
-    istreambuf_iterator_char first, istreambuf_iterator_char last, struct _ios_base *base, int *state, ULONG *pval)
+    istreambuf_iterator_char first, istreambuf_iterator_char last, ios_base *base, int *state, ULONG *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4652,7 +4651,7 @@ istreambuf_iterator_char *__thiscall num_get_char_get_ulong(const num_get *this,
 /* ?do_get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@MEBA?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AEAVios_base@2@AEAHAEAJ@Z */
 DEFINE_THISCALL_WRAPPER(num_get_char_do_get_long,36)
 istreambuf_iterator_char *__thiscall num_get_char_do_get_long(const num_get *this, istreambuf_iterator_char *ret,
-    istreambuf_iterator_char first, istreambuf_iterator_char last, struct _ios_base *base, int *state, LONG *pval)
+    istreambuf_iterator_char first, istreambuf_iterator_char last, ios_base *base, int *state, LONG *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4662,7 +4661,7 @@ istreambuf_iterator_char *__thiscall num_get_char_do_get_long(const num_get *thi
 /* ?get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@QEBA?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AEAVios_base@2@AEAHAEAJ@Z */
 DEFINE_THISCALL_WRAPPER(num_get_char_get_long,36)
 istreambuf_iterator_char *__thiscall num_get_char_get_long(const num_get *this, istreambuf_iterator_char *ret,
-    istreambuf_iterator_char first, istreambuf_iterator_char last, struct _ios_base *base, int *state, LONG *pval)
+    istreambuf_iterator_char first, istreambuf_iterator_char last, ios_base *base, int *state, LONG *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4672,7 +4671,7 @@ istreambuf_iterator_char *__thiscall num_get_char_get_long(const num_get *this,
 /* ?do_get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@MEBA?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AEAVios_base@2@AEAHAEAI@Z */
 DEFINE_THISCALL_WRAPPER(num_get_char_do_get_uint,36)
 istreambuf_iterator_char *__thiscall num_get_char_do_get_uint(const num_get *this, istreambuf_iterator_char *ret,
-    istreambuf_iterator_char first, istreambuf_iterator_char last, struct _ios_base *base, int *state, unsigned int *pval)
+    istreambuf_iterator_char first, istreambuf_iterator_char last, ios_base *base, int *state, unsigned int *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4682,7 +4681,7 @@ istreambuf_iterator_char *__thiscall num_get_char_do_get_uint(const num_get *thi
 /* ?get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@QEBA?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AEAVios_base@2@AEAHAEAI@Z */
 DEFINE_THISCALL_WRAPPER(num_get_char_get_uint,36)
 istreambuf_iterator_char *__thiscall num_get_char_get_uint(const num_get *this, istreambuf_iterator_char *ret,
-    istreambuf_iterator_char first, istreambuf_iterator_char last, struct _ios_base *base, int *state, unsigned int *pval)
+    istreambuf_iterator_char first, istreambuf_iterator_char last, ios_base *base, int *state, unsigned int *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4692,7 +4691,7 @@ istreambuf_iterator_char *__thiscall num_get_char_get_uint(const num_get *this,
 /* ?do_get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@MEBA?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AEAVios_base@2@AEAHAEAG@Z */
 DEFINE_THISCALL_WRAPPER(num_get_char_do_get_ushort,36)
 istreambuf_iterator_char *__thiscall num_get_char_do_get_ushort(const num_get *this, istreambuf_iterator_char *ret,
-    istreambuf_iterator_char first, istreambuf_iterator_char last, struct _ios_base *base, int *state, unsigned short *pval)
+    istreambuf_iterator_char first, istreambuf_iterator_char last, ios_base *base, int *state, unsigned short *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4702,7 +4701,7 @@ istreambuf_iterator_char *__thiscall num_get_char_do_get_ushort(const num_get *t
 /* ?get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@QEBA?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AEAVios_base@2@AEAHAEAG@Z */
 DEFINE_THISCALL_WRAPPER(num_get_char_get_ushort,36)
 istreambuf_iterator_char *__thiscall num_get_char_get_ushort(const num_get *this, istreambuf_iterator_char *ret,
-    istreambuf_iterator_char first, istreambuf_iterator_char last, struct _ios_base *base, int *state, unsigned short *pval)
+    istreambuf_iterator_char first, istreambuf_iterator_char last, ios_base *base, int *state, unsigned short *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4712,7 +4711,7 @@ istreambuf_iterator_char *__thiscall num_get_char_get_ushort(const num_get *this
 /* ?do_get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@MEBA?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AEAVios_base@2@AEAHAEA_N@Z */
 DEFINE_THISCALL_WRAPPER(num_get_char_do_get_bool,36)
 istreambuf_iterator_char *__thiscall num_get_char_do_get_bool(const num_get *this, istreambuf_iterator_char *ret,
-    istreambuf_iterator_char first, istreambuf_iterator_char last, struct _ios_base *base, int *state, MSVCP_bool *pval)
+    istreambuf_iterator_char first, istreambuf_iterator_char last, ios_base *base, int *state, MSVCP_bool *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
@@ -4722,7 +4721,7 @@ istreambuf_iterator_char *__thiscall num_get_char_do_get_bool(const num_get *thi
 /* ?get@?$num_get@DV?$istreambuf_iterator@DU?$char_traits@D@std@@@std@@@std@@QEBA?AV?$istreambuf_iterator@DU?$char_traits@D@std@@@2@V32@0AEAVios_base@2@AEAHAEA_N@Z */
 DEFINE_THISCALL_WRAPPER(num_get_char_get_bool,36)
 istreambuf_iterator_char *__thiscall num_get_char_get_bool(const num_get *this, istreambuf_iterator_char *ret,
-    istreambuf_iterator_char first, istreambuf_iterator_char last, struct _ios_base *base, int *state, MSVCP_bool *pval)
+    istreambuf_iterator_char first, istreambuf_iterator_char last, ios_base *base, int *state, MSVCP_bool *pval)
 {
     FIXME("(%p %p %p %p %p) stub\n", this, ret, base, state, pval);
     return ret;
diff --git a/dlls/msvcp90/msvcp90.h b/dlls/msvcp90/msvcp90.h
index 2860a247082..2dde3300074 100644
--- a/dlls/msvcp90/msvcp90.h
+++ b/dlls/msvcp90/msvcp90.h
@@ -397,5 +397,92 @@ void __thiscall mutex_dtor(mutex*);
 void __thiscall mutex_lock(mutex*);
 void __thiscall mutex_unlock(mutex*);
 
+typedef enum {
+    FMTFLAG_skipws      = 0x0001,
+    FMTFLAG_unitbuf     = 0x0002,
+    FMTFLAG_uppercase   = 0x0004,
+    FMTFLAG_showbase    = 0x0008,
+    FMTFLAG_showpoint   = 0x0010,
+    FMTFLAG_showpos     = 0x0020,
+    FMTFLAG_left        = 0x0040,
+    FMTFLAG_right       = 0x0080,
+    FMTFLAG_internal    = 0x0100,
+    FMTFLAG_dec         = 0x0200,
+    FMTFLAG_oct         = 0x0400,
+    FMTFLAG_hex         = 0x0800,
+    FMTFLAG_scientific  = 0x1000,
+    FMTFLAG_fixed       = 0x2000,
+    FMTFLAG_hexfloat    = 0x3000,
+    FMTFLAG_boolalpha   = 0x4000,
+    FMTFLAG_stdio       = 0x8000,
+    FMTFLAG_adjustfield = FMTFLAG_left|FMTFLAG_right|FMTFLAG_internal,
+    FMTFLAG_basefield   = FMTFLAG_dec|FMTFLAG_oct|FMTFLAG_hex,
+    FMTFLAG_floadfield  = FMTFLAG_scientific|FMTFLAG_fixed,
+    FMTFLAG_mask        = 0xffff
+} IOSB_fmtflags;
+
+typedef enum {
+    OPENMODE_in         = 0x01,
+    OPENMODE_out        = 0x02,
+    OPENMODE_ate        = 0x04,
+    OPENMODE_app        = 0x08,
+    OPENMODE_trunc      = 0x10,
+    OPENMODE__Nocreate  = 0x40,
+    OPENMODE__Noreplace = 0x80,
+    OPENMODE_binary     = 0x20,
+    OPENMODE_mask       = 0xff
+} IOSB_openmode;
+
+typedef enum {
+    SEEKDIR_beg  = 0x1,
+    SEEKDIR_cur  = 0x2,
+    SEEKDIR_end  = 0x3,
+    SEEKDIR_mask = 0x3
+} IOSB_seekdir;
+
+typedef enum {
+    IOSTATE_goodbit   = 0x00,
+    IOSTATE_eofbit    = 0x01,
+    IOSTATE_failbit   = 0x02,
+    IOSTATE_badbit    = 0x04,
+    IOSTATE__Hardfail = 0x10,
+    IOSTATE_mask      = 0x17
+} IOSB_iostate;
+
+typedef struct _iosarray {
+    struct _iosarray *next;
+    int index;
+    int long_val;
+    void *ptr_val;
+} IOS_BASE_iosarray;
+
+typedef enum {
+    EVENT_erase_event,
+    EVENT_imbue_event,
+    EVENT_copyfmt_event
+} IOS_BASE_event;
+
+struct _ios_base;
+typedef void (CDECL *IOS_BASE_event_callback)(IOS_BASE_event, struct _ios_base*, int);
+typedef struct _fnarray {
+    struct _fnarray *next;
+    int index;
+    IOS_BASE_event_callback event_handler;
+} IOS_BASE_fnarray;
+
+/* class ios_base */
+typedef struct _ios_base {
+    const vtable_ptr *vtable;
+    MSVCP_size_t stdstr;
+    IOSB_iostate state;
+    IOSB_iostate except;
+    IOSB_fmtflags fmtfl;
+    streamsize prec;
+    streamsize wide;
+    IOS_BASE_iosarray *arr;
+    IOS_BASE_fnarray *calls;
+    locale *loc;
+} ios_base;
+
 void init_io(void);
 void free_io(void);