Add _cbprintf/_vcbprintf (callback based printf formatters)

[pdclib.old] / internals / _PDCLIB_int.h

diff --git a/internals/_PDCLIB_int.h b/internals/_PDCLIB_int.h
index c9988a9d7c2d67e045b2b705702f82a1ac696ee2..c200419e6133a0235fd92448066744cdf83db6d6 100644 (file)
--- a/internals/_PDCLIB_int.h
+++ b/internals/_PDCLIB_int.h
@@ -309,29 +309,13 @@ _PDCLIB_uintmax_t _PDCLIB_strtox_main( const char ** p, unsigned int base, _PDCL
 extern char _PDCLIB_digits[];
 extern char _PDCLIB_Xdigits[];
 
-/* -------------------------------------------------------------------------- */
-/* errno                                                                      */
-/* -------------------------------------------------------------------------- */
-
-/* If PDCLib would call its error number "errno" directly, there would be no way
-   to catch its value from underlying system calls that also use it (i.e., POSIX
-   operating systems). That is why we use an internal name, providing a means to
-   access it through <errno.h>.
-*/
-extern int _PDCLIB_errno;
-
-/* A mechanism for delayed evaluation. (Not sure if this is really necessary, so
-   no detailed documentation on the "why".)
-*/
-int * _PDCLIB_errno_func( void ) _PDCLIB_nothrow;
-
 /* -------------------------------------------------------------------------- */
 /* locale / wchar / uchar                                                     */
 /* -------------------------------------------------------------------------- */
 
 #ifndef __cplusplus
-typedef _PDCLIB_int16_t         _PDCLIB_char16_t;
-typedef _PDCLIB_int32_t         _PDCLIB_char32_t;
+typedef _PDCLIB_uint16_t        _PDCLIB_char16_t;
+typedef _PDCLIB_uint32_t        _PDCLIB_char32_t;
 #else
 typedef char16_t                _PDCLIB_char16_t;
 typedef char32_t                _PDCLIB_char32_t;
@@ -348,22 +332,31 @@ typedef struct _PDCLIB_mbstate {
                  char    _StC [124];
     };
 
-    union {
-        /* c16/related functions: Surrogate storage
-         *
-         * If zero, no surrogate pending. If nonzero, surrogate.
-         */
-        _PDCLIB_uint16_t     _Surrogate;
-
-        /* Reserved for potential mbtoutf8/etc functions */
-        unsigned char        _U8[4];
-    };
+    /* c16/related functions: Surrogate storage
+     *
+     * If zero, no surrogate pending. If nonzero, surrogate.
+     */
+    _PDCLIB_uint16_t     _Surrogate;
+
+    /* In cases where the underlying codec is capable of regurgitating a
+     * character without consuming any extra input (e.g. a surrogate pair in a
+     * UCS-4 to UTF-16 conversion) then these fields are used to track that
+     * state. In particular, they are used to buffer/fake the input for mbrtowc
+     * and similar functions.
+     *
+     * See _PDCLIB_encoding.h for values of _PendState and the resultant value
+     * in _PendChar.
+     */
+    unsigned char _PendState;
+             char _PendChar;
 } _PDCLIB_mbstate_t;
 
 typedef struct _PDCLIB_charcodec *_PDCLIB_charcodec_t;
 typedef struct _PDCLIB_locale    *_PDCLIB_locale_t;
 typedef struct lconv              _PDCLIB_lconv_t;
 
+_PDCLIB_size_t _PDCLIB_mb_cur_max( void );
+
 /* -------------------------------------------------------------------------- */
 /* stdio                                                                      */
 /* -------------------------------------------------------------------------- */
@@ -382,17 +375,26 @@ typedef struct _PDCLIB_file     _PDCLIB_file_t; // Rename to _PDCLIB_FILE?
 /* Status structure required by _PDCLIB_print(). */
 struct _PDCLIB_status_t
 {
+    /* XXX This structure is horrible now. scanf needs its own */
+
     int              base;   /* base to which the value shall be converted   */
     _PDCLIB_int_fast32_t flags; /* flags and length modifiers                */
-    unsigned         n;      /* print: maximum characters to be written      */
+    unsigned         n;      /* print: maximum characters to be written (snprintf) */
                              /* scan:  number matched conversion specifiers  */
     unsigned         i;      /* number of characters read/written            */
     unsigned         current;/* chars read/written in the CURRENT conversion */
-    char *           s;      /* *sprintf(): target buffer                    */
-                             /* *sscanf():  source string                    */
     unsigned         width;  /* specified field width                        */
     int              prec;   /* specified field precision                    */
-    _PDCLIB_file_t * stream; /* *fprintf() / *fscanf() stream         */
+
+    union {
+        void *           ctx;    /* context for callback */
+        const char *     s;      /* input string for scanf */
+    };
+
+    union {
+        _PDCLIB_size_t ( *write ) ( void *p, const char *buf, _PDCLIB_size_t size );
+        _PDCLIB_file_t *stream;  /* for scanf */
+    };
     _PDCLIB_va_list  arg;    /* argument stack                               */
 };