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-rw-r--r--iconv/skeleton.c28
1 files changed, 27 insertions, 1 deletions
diff --git a/iconv/skeleton.c b/iconv/skeleton.c
index edcd92eb87..579426c7e5 100644
--- a/iconv/skeleton.c
+++ b/iconv/skeleton.c
@@ -101,6 +101,26 @@
EXTRA_LOOP_ARGS optional macro specifying extra arguments passed
to loop function.
+ STORE_REST optional, needed only when MAX_NEEDED_FROM > 4.
+ This macro stores the seen but unconverted input bytes
+ in the state.
+
+ FROM_ONEBYTE optional. If defined, should be the name of a
+ specialized conversion function for a single byte
+ from the current character set to INTERNAL. This
+ function has prototype
+ wint_t
+ FROM_ONEBYTE (struct __gconv_step *, unsigned char);
+ and does a special conversion:
+ - The input is a single byte.
+ - The output is a single uint32_t.
+ - The state before the conversion is the initial state;
+ the state after the conversion is irrelevant.
+ - No transliteration.
+ - __invocation_counter = 0.
+ - __internal_use = 1.
+ - do_flush = 0.
+
Modules can use mbstate_t to store conversion state as follows:
* Bits 2..0 of '__count' contain the number of lookahead input bytes
@@ -315,6 +335,10 @@ gconv_init (struct __gconv_step *step)
step->__max_needed_from = FROM_LOOP_MAX_NEEDED_FROM;
step->__min_needed_to = FROM_LOOP_MIN_NEEDED_TO;
step->__max_needed_to = FROM_LOOP_MAX_NEEDED_TO;
+
+#ifdef FROM_ONEBYTE
+ step->__btowc_fct = FROM_ONEBYTE;
+#endif
}
else if (__builtin_expect (strcmp (step->__to_name, CHARSET_NAME), 0) == 0)
{
@@ -796,10 +820,12 @@ FUNCTION_NAME (struct __gconv_step *step, struct __gconv_step_data *data,
#undef EMIT_SHIFT_TO_INIT
#undef FROM_LOOP
#undef TO_LOOP
+#undef ONE_DIRECTION
#undef SAVE_RESET_STATE
#undef RESET_INPUT_BUFFER
#undef FUNCTION_NAME
#undef PREPARE_LOOP
#undef END_LOOP
-#undef ONE_DIRECTION
+#undef EXTRA_LOOP_ARGS
#undef STORE_REST
+#undef FROM_ONEBYTE