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path: root/wcsmbs/btowc.c
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Diffstat (limited to 'wcsmbs/btowc.c')
-rw-r--r--wcsmbs/btowc.c69
1 files changed, 41 insertions, 28 deletions
diff --git a/wcsmbs/btowc.c b/wcsmbs/btowc.c
index ca75e28..1ba0221 100644
--- a/wcsmbs/btowc.c
+++ b/wcsmbs/btowc.c
@@ -30,12 +30,6 @@ wint_t
__btowc (c)
int c;
{
- wchar_t result;
- struct __gconv_step_data data;
- unsigned char inbuf[1];
- const unsigned char *inptr = inbuf;
- size_t dummy;
- int status;
const struct gconv_fcts *fcts;
/* If the parameter does not fit into one byte or it is the EOF value
@@ -43,32 +37,51 @@ __btowc (c)
if (c < SCHAR_MIN || c > UCHAR_MAX || c == EOF)
return WEOF;
- /* Tell where we want the result. */
- data.__outbuf = (unsigned char *) &result;
- data.__outbufend = data.__outbuf + sizeof (wchar_t);
- data.__invocation_counter = 0;
- data.__internal_use = 1;
- data.__flags = __GCONV_IS_LAST;
- data.__statep = &data.__state;
- data.__trans = NULL;
-
- /* Make sure we start in the initial state. */
- memset (&data.__state, '\0', sizeof (mbstate_t));
-
/* Get the conversion functions. */
fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
- /* Create the input string. */
- inbuf[0] = c;
+ if (__builtin_expect (fcts->towc_nsteps == 1, 1)
+ && __builtin_expect (fcts->towc->__btowc_fct != NULL, 1))
+ {
+ /* Use the shortcut function. */
+ return DL_CALL_FCT (fcts->towc->__btowc_fct,
+ (fcts->towc, (unsigned char) c));
+ }
+ else
+ {
+ /* Fall back to the slow but generic method. */
+ wchar_t result;
+ struct __gconv_step_data data;
+ unsigned char inbuf[1];
+ const unsigned char *inptr = inbuf;
+ size_t dummy;
+ int status;
+
+ /* Tell where we want the result. */
+ data.__outbuf = (unsigned char *) &result;
+ data.__outbufend = data.__outbuf + sizeof (wchar_t);
+ data.__invocation_counter = 0;
+ data.__internal_use = 1;
+ data.__flags = __GCONV_IS_LAST;
+ data.__statep = &data.__state;
+ data.__trans = NULL;
+
+ /* Make sure we start in the initial state. */
+ memset (&data.__state, '\0', sizeof (mbstate_t));
+
+ /* Create the input string. */
+ inbuf[0] = c;
+
+ status = DL_CALL_FCT (fcts->towc->__fct,
+ (fcts->towc, &data, &inptr, inptr + 1,
+ NULL, &dummy, 0, 1));
- status = DL_CALL_FCT (fcts->towc->__fct,
- (fcts->towc, &data, &inptr, inptr + 1,
- NULL, &dummy, 0, 1));
- /* The conversion failed. */
- if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT
- && status != __GCONV_EMPTY_INPUT)
- result = WEOF;
+ if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT
+ && status != __GCONV_EMPTY_INPUT)
+ /* The conversion failed. */
+ result = WEOF;
- return result;
+ return result;
+ }
}
weak_alias (__btowc, btowc)