diff options
Diffstat (limited to 'iconv/skeleton.c')
| -rw-r--r-- | iconv/skeleton.c | 234 |
1 files changed, 169 insertions, 65 deletions
diff --git a/iconv/skeleton.c b/iconv/skeleton.c index 9a609c9..edcd92e 100644 --- a/iconv/skeleton.c +++ b/iconv/skeleton.c @@ -37,6 +37,27 @@ This macro is optional, it defaults to MIN_NEEDED_FROM. MAX_NEEDED_TO likewise for the to-charset. + FROM_LOOP_MIN_NEEDED_FROM + FROM_LOOP_MAX_NEEDED_FROM + minimal/maximal number of bytes needed on input + of one round through the FROM_LOOP. Defaults + to MIN_NEEDED_FROM and MAX_NEEDED_FROM, respectively. + FROM_LOOP_MIN_NEEDED_TO + FROM_LOOP_MAX_NEEDED_TO + minimal/maximal number of bytes needed on output + of one round through the FROM_LOOP. Defaults + to MIN_NEEDED_TO and MAX_NEEDED_TO, respectively. + TO_LOOP_MIN_NEEDED_FROM + TO_LOOP_MAX_NEEDED_FROM + minimal/maximal number of bytes needed on input + of one round through the TO_LOOP. Defaults + to MIN_NEEDED_TO and MAX_NEEDED_TO, respectively. + TO_LOOP_MIN_NEEDED_TO + TO_LOOP_MAX_NEEDED_TO + minimal/maximal number of bytes needed on output + of one round through the TO_LOOP. Defaults + to MIN_NEEDED_FROM and MAX_NEEDED_FROM, respectively. + DEFINE_DIRECTION_OBJECTS two objects will be defined to be used when the `gconv' function must only distinguish two @@ -50,11 +71,11 @@ EMIT_SHIFT_TO_INIT this symbol is optional. If it is defined it defines some code which writes out a sequence - of characters which bring the current state into + of bytes which bring the current state into the initial state. FROM_LOOP name of the function implementing the conversion - from the current characters. + from the current character set. TO_LOOP likewise for the other direction ONE_DIRECTION optional. If defined to 1, only one conversion @@ -79,6 +100,24 @@ EXTRA_LOOP_ARGS optional macro specifying extra arguments passed to loop function. + + Modules can use mbstate_t to store conversion state as follows: + + * Bits 2..0 of '__count' contain the number of lookahead input bytes + stored in __value.__wchb. Always zero if the converter never + returns __GCONV_INCOMPLETE_INPUT. + + * Bits 31..3 of '__count' are module dependent shift state. + + * __value: When STORE_REST/UNPACK_BYTES aren't defined and when the + converter has returned __GCONV_INCOMPLETE_INPUT, this contains + at most 4 lookahead bytes. Converters with an mb_cur_max > 4 + (currently only UTF-8) must find a way to store their state + in __value.__wch and define STORE_REST/UNPACK_BYTES appropriately. + + When __value contains lookahead, __count must not be zero, because + the converter is not in the initial state then, and mbsinit() -- + defined as a (__count == 0) test -- must reflect this. */ #include <assert.h> @@ -121,6 +160,32 @@ static int to_object; # define MAX_NEEDED_TO MIN_NEEDED_TO #endif +/* Defaults for the per-direction min/max constants. */ +#ifndef FROM_LOOP_MIN_NEEDED_FROM +# define FROM_LOOP_MIN_NEEDED_FROM MIN_NEEDED_FROM +#endif +#ifndef FROM_LOOP_MAX_NEEDED_FROM +# define FROM_LOOP_MAX_NEEDED_FROM MAX_NEEDED_FROM +#endif +#ifndef FROM_LOOP_MIN_NEEDED_TO +# define FROM_LOOP_MIN_NEEDED_TO MIN_NEEDED_TO +#endif +#ifndef FROM_LOOP_MAX_NEEDED_TO +# define FROM_LOOP_MAX_NEEDED_TO MAX_NEEDED_TO +#endif +#ifndef TO_LOOP_MIN_NEEDED_FROM +# define TO_LOOP_MIN_NEEDED_FROM MIN_NEEDED_TO +#endif +#ifndef TO_LOOP_MAX_NEEDED_FROM +# define TO_LOOP_MAX_NEEDED_FROM MAX_NEEDED_TO +#endif +#ifndef TO_LOOP_MIN_NEEDED_TO +# define TO_LOOP_MIN_NEEDED_TO MIN_NEEDED_FROM +#endif +#ifndef TO_LOOP_MAX_NEEDED_TO +# define TO_LOOP_MAX_NEEDED_TO MAX_NEEDED_FROM +#endif + /* Define macros which can access unaligned buffers. These macros are supposed to be used only in code outside the inner loops. For the inner @@ -192,21 +257,40 @@ static int to_object; /* For conversions from a fixed width character set to another fixed width character set we can define RESET_INPUT_BUFFER in a very fast way. */ #if !defined RESET_INPUT_BUFFER && !defined SAVE_RESET_STATE -# if MIN_NEEDED_FROM == MAX_NEEDED_FROM && MIN_NEEDED_TO == MAX_NEEDED_TO -/* We have to use these `#if's here since the compiler cannot know that - (outbuf - outerr) is always divisible by MIN_NEEDED_TO. We have to - use preprocessor arithmetic and no C code because gcc 3.2 complains - about division by zero even in obviously dead code. */ -# if MIN_NEEDED_FROM % MIN_NEEDED_TO == 0 -# define RESET_INPUT_BUFFER \ - *inptrp -= (outbuf - outerr) * (MIN_NEEDED_FROM / MIN_NEEDED_TO) -# elif MIN_NEEDED_TO % MIN_NEEDED_FROM == 0 -# define RESET_INPUT_BUFFER \ - *inptrp -= (outbuf - outerr) / (MIN_NEEDED_TO / MIN_NEEDED_FROM) -# else -# define RESET_INPUT_BUFFER \ - *inptrp -= ((outbuf - outerr) / MIN_NEEDED_TO) * MIN_NEEDED_FROM -# endif +# if FROM_LOOP_MIN_NEEDED_FROM == FROM_LOOP_MAX_NEEDED_FROM \ + && FROM_LOOP_MIN_NEEDED_TO == FROM_LOOP_MAX_NEEDED_TO \ + && TO_LOOP_MIN_NEEDED_FROM == TO_LOOP_MAX_NEEDED_FROM \ + && TO_LOOP_MIN_NEEDED_TO == TO_LOOP_MAX_NEEDED_TO +/* We have to use these `if's here since the compiler cannot know that + (outbuf - outerr) is always divisible by FROM/TO_LOOP_MIN_NEEDED_TO. + The ?:1 avoids division by zero warnings that gcc 3.2 emits even for + obviously unreachable code. */ +# define RESET_INPUT_BUFFER \ + if (FROM_DIRECTION) \ + { \ + if (FROM_LOOP_MIN_NEEDED_FROM % FROM_LOOP_MIN_NEEDED_TO == 0) \ + *inptrp -= (outbuf - outerr) \ + * (FROM_LOOP_MIN_NEEDED_FROM / FROM_LOOP_MIN_NEEDED_TO); \ + else if (FROM_LOOP_MIN_NEEDED_TO % FROM_LOOP_MIN_NEEDED_FROM == 0) \ + *inptrp -= (outbuf - outerr) \ + / (FROM_LOOP_MIN_NEEDED_TO / FROM_LOOP_MIN_NEEDED_FROM \ + ? : 1); \ + else \ + *inptrp -= ((outbuf - outerr) / FROM_LOOP_MIN_NEEDED_TO) \ + * FROM_LOOP_MIN_NEEDED_FROM; \ + } \ + else \ + { \ + if (TO_LOOP_MIN_NEEDED_FROM % TO_LOOP_MIN_NEEDED_TO == 0) \ + *inptrp -= (outbuf - outerr) \ + * (TO_LOOP_MIN_NEEDED_FROM / TO_LOOP_MIN_NEEDED_TO); \ + else if (TO_LOOP_MIN_NEEDED_TO % TO_LOOP_MIN_NEEDED_FROM == 0) \ + *inptrp -= (outbuf - outerr) \ + / (TO_LOOP_MIN_NEEDED_TO / TO_LOOP_MIN_NEEDED_FROM ? : 1); \ + else \ + *inptrp -= ((outbuf - outerr) / TO_LOOP_MIN_NEEDED_TO) \ + * TO_LOOP_MIN_NEEDED_FROM; \ + } # endif #endif @@ -227,19 +311,19 @@ gconv_init (struct __gconv_step *step) { step->__data = &from_object; - step->__min_needed_from = MIN_NEEDED_FROM; - step->__max_needed_from = MAX_NEEDED_FROM; - step->__min_needed_to = MIN_NEEDED_TO; - step->__max_needed_to = MAX_NEEDED_TO; + step->__min_needed_from = FROM_LOOP_MIN_NEEDED_FROM; + 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; } else if (__builtin_expect (strcmp (step->__to_name, CHARSET_NAME), 0) == 0) { step->__data = &to_object; - step->__min_needed_from = MIN_NEEDED_TO; - step->__max_needed_from = MAX_NEEDED_TO; - step->__min_needed_to = MIN_NEEDED_FROM; - step->__max_needed_to = MAX_NEEDED_FROM; + step->__min_needed_from = TO_LOOP_MIN_NEEDED_FROM; + step->__max_needed_from = TO_LOOP_MAX_NEEDED_FROM; + step->__min_needed_to = TO_LOOP_MIN_NEEDED_TO; + step->__max_needed_to = TO_LOOP_MAX_NEEDED_TO; } else return __GCONV_NOCONV; @@ -403,27 +487,45 @@ FUNCTION_NAME (struct __gconv_step *step, struct __gconv_step_data *data, actually converted. */ size_t lirreversible = 0; size_t *lirreversiblep = irreversible ? &lirreversible : NULL; -#if defined _STRING_ARCH_unaligned \ - || MIN_NEEDED_FROM == 1 || MAX_NEEDED_FROM % MIN_NEEDED_FROM != 0 \ - || MIN_NEEDED_TO == 1 || MAX_NEEDED_TO % MIN_NEEDED_TO != 0 -# define unaligned 0 -#else + + /* The following assumes that encodings, which have a variable length + what might unalign a buffer even though it is a aligned in the + beginning, either don't have the minimal number of bytes as a divisor + of the maximum length or have a minimum length of 1. This is true + for all known and supported encodings. + We use && instead of || to combine the subexpression for the FROM + encoding and for the TO encoding, because usually one of them is + INTERNAL, for which the subexpression evaluates to 1, but INTERNAL + buffers are always aligned correctly. */ +#define POSSIBLY_UNALIGNED \ + (!defined _STRING_ARCH_unaligned \ + && (((FROM_LOOP_MIN_NEEDED_FROM != 1 \ + && FROM_LOOP_MAX_NEEDED_FROM % FROM_LOOP_MIN_NEEDED_FROM == 0) \ + && (FROM_LOOP_MIN_NEEDED_TO != 1 \ + && FROM_LOOP_MAX_NEEDED_TO % FROM_LOOP_MIN_NEEDED_TO == 0)) \ + || ((TO_LOOP_MIN_NEEDED_FROM != 1 \ + && TO_LOOP_MAX_NEEDED_FROM % TO_LOOP_MIN_NEEDED_FROM == 0) \ + && (TO_LOOP_MIN_NEEDED_TO != 1 \ + && TO_LOOP_MAX_NEEDED_TO % TO_LOOP_MIN_NEEDED_TO == 0)))) +#if POSSIBLY_UNALIGNED int unaligned; # define GEN_unaligned(name) GEN_unaligned2 (name) # define GEN_unaligned2(name) name##_unaligned +#else +# define unaligned 0 #endif #ifdef PREPARE_LOOP PREPARE_LOOP #endif -#if MAX_NEEDED_FROM > 1 || MAX_NEEDED_TO > 1 +#if FROM_LOOP_MAX_NEEDED_FROM > 1 || TO_LOOP_MAX_NEEDED_FROM > 1 /* If the function is used to implement the mb*towc*() or wc*tomb*() functions we must test whether any bytes from the last call are stored in the `state' object. */ - if (((MAX_NEEDED_FROM > 1 && MAX_NEEDED_TO > 1) - || (MAX_NEEDED_FROM > 1 && FROM_DIRECTION) - || (MAX_NEEDED_TO > 1 && !FROM_DIRECTION)) + if (((FROM_LOOP_MAX_NEEDED_FROM > 1 && TO_LOOP_MAX_NEEDED_FROM > 1) + || (FROM_LOOP_MAX_NEEDED_FROM > 1 && FROM_DIRECTION) + || (TO_LOOP_MAX_NEEDED_FROM > 1 && !FROM_DIRECTION)) && consume_incomplete && (data->__statep->__count & 7) != 0) { /* Yep, we have some bytes left over. Process them now. @@ -431,18 +533,20 @@ FUNCTION_NAME (struct __gconv_step *step, struct __gconv_step_data *data, error handler. */ assert (outbufstart == NULL); -# if MAX_NEEDED_FROM > 1 - if (MAX_NEEDED_TO == 1 || FROM_DIRECTION) +# if FROM_LOOP_MAX_NEEDED_FROM > 1 + if (TO_LOOP_MAX_NEEDED_FROM == 1 || FROM_DIRECTION) status = SINGLE(FROM_LOOP) (step, data, inptrp, inend, &outbuf, outend, lirreversiblep EXTRA_LOOP_ARGS); # endif -# if MAX_NEEDED_FROM > 1 && MAX_NEEDED_TO > 1 && !ONE_DIRECTION +# if !ONE_DIRECTION +# if FROM_LOOP_MAX_NEEDED_FROM > 1 && TO_LOOP_MAX_NEEDED_FROM > 1 else -# endif -# if MAX_NEEDED_TO > 1 && !ONE_DIRECTION +# endif +# if TO_LOOP_MAX_NEEDED_FROM > 1 status = SINGLE(TO_LOOP) (step, data, inptrp, inend, &outbuf, outend, lirreversiblep EXTRA_LOOP_ARGS); +# endif # endif if (__builtin_expect (status, __GCONV_OK) != __GCONV_OK) @@ -450,22 +554,16 @@ FUNCTION_NAME (struct __gconv_step *step, struct __gconv_step_data *data, } #endif -#if !defined _STRING_ARCH_unaligned \ - && MIN_NEEDED_FROM != 1 && MAX_NEEDED_FROM % MIN_NEEDED_FROM == 0 \ - && MIN_NEEDED_TO != 1 && MAX_NEEDED_TO % MIN_NEEDED_TO == 0 - /* The following assumes that encodings, which have a variable length - what might unalign a buffer even though it is a aligned in the - beginning, either don't have the minimal number of bytes as a divisor - of the maximum length or have a minimum length of 1. This is true - for all known and supported encodings. */ - unaligned = ((FROM_DIRECTION - && ((uintptr_t) inptr % MIN_NEEDED_FROM != 0 - || ((data->__flags & __GCONV_IS_LAST) - && (uintptr_t) outbuf % MIN_NEEDED_TO != 0))) - || (!FROM_DIRECTION - && (((data->__flags & __GCONV_IS_LAST) - && (uintptr_t) outbuf % MIN_NEEDED_FROM != 0) - || (uintptr_t) inptr % MIN_NEEDED_TO != 0))); +#if POSSIBLY_UNALIGNED + unaligned = + ((FROM_DIRECTION + && ((uintptr_t) inptr % FROM_LOOP_MIN_NEEDED_FROM != 0 + || ((data->__flags & __GCONV_IS_LAST) + && (uintptr_t) outbuf % FROM_LOOP_MIN_NEEDED_TO != 0))) + || (!FROM_DIRECTION + && (((data->__flags & __GCONV_IS_LAST) + && (uintptr_t) outbuf % TO_LOOP_MIN_NEEDED_TO != 0) + || (uintptr_t) inptr % TO_LOOP_MIN_NEEDED_FROM != 0))); #endif while (1) @@ -492,9 +590,7 @@ FUNCTION_NAME (struct __gconv_step *step, struct __gconv_step_data *data, status = TO_LOOP (step, data, inptrp, inend, &outbuf, outend, lirreversiblep EXTRA_LOOP_ARGS); } -#if !defined _STRING_ARCH_unaligned \ - && MIN_NEEDED_FROM != 1 && MAX_NEEDED_FROM % MIN_NEEDED_FROM == 0 \ - && MIN_NEEDED_TO != 1 && MAX_NEEDED_TO % MIN_NEEDED_TO == 0 +#if POSSIBLY_UNALIGNED else { if (FROM_DIRECTION) @@ -589,9 +685,7 @@ FUNCTION_NAME (struct __gconv_step *step, struct __gconv_step_data *data, lirreversiblep EXTRA_LOOP_ARGS); } -# if !defined _STRING_ARCH_unaligned \ - && MIN_NEEDED_FROM != 1 && MAX_NEEDED_FROM % MIN_NEEDED_FROM == 0 \ - && MIN_NEEDED_TO != 1 && MAX_NEEDED_TO % MIN_NEEDED_TO == 0 +# if POSSIBLY_UNALIGNED else { if (FROM_DIRECTION) @@ -650,10 +744,10 @@ FUNCTION_NAME (struct __gconv_step *step, struct __gconv_step_data *data, /* If we are supposed to consume all character store now all of the remaining characters in the `state' object. */ -#if MAX_NEEDED_FROM > 1 || MAX_NEEDED_TO > 1 - if (((MAX_NEEDED_FROM > 1 && MAX_NEEDED_TO > 1) - || (MAX_NEEDED_FROM > 1 && FROM_DIRECTION) - || (MAX_NEEDED_TO > 1 && !FROM_DIRECTION)) +#if FROM_LOOP_MAX_NEEDED_FROM > 1 || TO_LOOP_MAX_NEEDED_FROM > 1 + if (((FROM_LOOP_MAX_NEEDED_FROM > 1 && TO_LOOP_MAX_NEEDED_FROM > 1) + || (FROM_LOOP_MAX_NEEDED_FROM > 1 && FROM_DIRECTION) + || (TO_LOOP_MAX_NEEDED_FROM > 1 && !FROM_DIRECTION)) && __builtin_expect (consume_incomplete, 0) && status == __GCONV_INCOMPLETE_INPUT) { @@ -675,6 +769,8 @@ FUNCTION_NAME (struct __gconv_step *step, struct __gconv_step_data *data, # endif } #endif +#undef unaligned +#undef POSSIBLY_UNALIGNED } return status; @@ -687,6 +783,14 @@ FUNCTION_NAME (struct __gconv_step *step, struct __gconv_step_data *data, #undef MIN_NEEDED_TO #undef MAX_NEEDED_FROM #undef MAX_NEEDED_TO +#undef FROM_LOOP_MIN_NEEDED_FROM +#undef FROM_LOOP_MAX_NEEDED_FROM +#undef FROM_LOOP_MIN_NEEDED_TO +#undef FROM_LOOP_MAX_NEEDED_TO +#undef TO_LOOP_MIN_NEEDED_FROM +#undef TO_LOOP_MAX_NEEDED_FROM +#undef TO_LOOP_MIN_NEEDED_TO +#undef TO_LOOP_MAX_NEEDED_TO #undef DEFINE_DIRECTION_OBJECTS #undef FROM_DIRECTION #undef EMIT_SHIFT_TO_INIT |