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Define get16, get32, put16, and put32 macros to allow as well reading from/writing to unaligned addresses on machines which don't support this in hardware. Use FCTNAME macro to define function name. Include the file a second time for platforms which need special unaligned handling.

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This commit is contained in:
Ulrich Drepper 2000-03-28 17:18:18 +00:00
parent 26c400e689
commit b35e58e479
1 changed files with 95 additions and 3 deletions
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98
iconv/loop.c
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@ -45,13 +45,90 @@
UPDATE_PARAMS code to store result in params.
*/
#include <endian.h>
#include <gconv.h>
#include <stdint.h>
#include <string.h>
#include <wchar.h>
#include <sys/param.h> /* For MIN. */
#define __need_size_t
#include <stddef.h>
/* We have to provide support for machines which are not able to handled
unaligned memory accesses. Some of the character encodings have
representations with a fixed width of 2 or 4 bytes. But if we cannot
access unaligned memory we still have to read byte-wise. */
#undef FCTNAME2
#if defined _STRING_ARCH_unaligned || !defined DEFINE_UNALIGNED
/* We can handle unaligned memory access. */
# define get16(addr) *((uint16_t *) (addr))
# define get32(addr) *((uint32_t *) (addr))
/* We need no special support for writing values either. */
# define put16(addr, val) *((uint16_t *) (addr)) = (val)
# define put32(addr, val) *((uint32_t *) (addr)) = (val)
# define FCTNAME2(name) name
#else
/* Distinguish between big endian and little endian. */
# if __BYTE_ORDER == __LITTLE_ENDIAN
# define get16(addr) \
(((__const unsigned char *) (addr))[1] << 8 \
| ((__const unsigned char *) (addr))[0])
# define get32(addr) \
(((((__const unsigned char *) (addr))[3] << 8 \
| ((__const unsigned char *) (addr))[2]) << 8 \
| ((__const unsigned char *) (addr))[1]) << 8 \
| ((__const unsigned char *) (addr))[0])
# define put16(addr, val) \
({ uint16_t __val = (val); \
((__const unsigned char *) (addr))[0] = __val; \
((__const unsigned char *) (addr))[1] = __val >> 8; \
(void) 0; })
# define put32(addr, val) \
({ uint16_t __val = (val); \
((__const unsigned char *) (addr))[0] = __val; \
__val >>= 8; \
((__const unsigned char *) (addr))[1] = __val; \
__val >>= 8; \
((__const unsigned char *) (addr))[2] = __val; \
__val >>= 8; \
((__const unsigned char *) (addr))[3] = __val; \
(void) 0; })
# else
# define get16(addr) \
(((__const unsigned char *) (addr))[0] << 8 \
| ((__const unsigned char *) (addr))[1])
# define get32(addr) \
(((((__const unsigned char *) (addr))[0] << 8 \
| ((__const unsigned char *) (addr))[1]) << 8 \
| ((__const unsigned char *) (addr))[2]) << 8 \
| ((__const unsigned char *) (addr))[3])
# define put16(addr, val) \
({ uint16_t __val = (val); \
((__const unsigned char *) (addr))[1] = __val; \
((__const unsigned char *) (addr))[2] = __val >> 8; \
(void) 0; })
# define put32(addr, val) \
({ uint16_t __val = (val); \
((__const unsigned char *) (addr))[3] = __val; \
__val >>= 8; \
((__const unsigned char *) (addr))[2] = __val; \
__val >>= 8; \
((__const unsigned char *) (addr))[1] = __val; \
__val >>= 8; \
((__const unsigned char *) (addr))[0] = __val; \
(void) 0; })
# endif
# define FCTNAME2(name) name##_unaligned
#endif
#define FCTNAME(name) FCTNAME2(name)
/* We need at least one byte for the next round. */
#ifndef MIN_NEEDED_INPUT
# error "MIN_NEEDED_INPUT definition missing"
@ -92,9 +169,10 @@
/* The function returns the status, as defined in gconv.h. */
static inline int
LOOPFCT (const unsigned char **inptrp, const unsigned char *inend,
unsigned char **outptrp, unsigned char *outend, mbstate_t *state,
void *data, size_t *converted EXTRA_LOOP_DECLS)
FCTNAME (LOOPFCT) (const unsigned char **inptrp, const unsigned char *inend,
unsigned char **outptrp, unsigned char *outend,
mbstate_t *state, void *data, size_t *converted
EXTRA_LOOP_DECLS)
{
int result = __GCONV_OK;
const unsigned char *inptr = *inptrp;
@ -183,6 +261,15 @@ LOOPFCT (const unsigned char **inptrp, const unsigned char *inend,
}
/* Include the file a second time to define the function to define the
function to handle unaligned access. */
#if !defined _STRING_ARCH_unaligned && !defined DEFINE_UNALIGNED
# define DEFINE_UNALIGNED
# include "loop.c"
# undef DEFINE_UNALIGNED
#endif
/* We remove the macro definitions so that we can include this file again
for the definition of another function. */
#undef MIN_NEEDED_INPUT
@ -195,3 +282,8 @@ LOOPFCT (const unsigned char **inptrp, const unsigned char *inend,
#undef EXTRA_LOOP_DECLS
#undef INIT_PARAMS
#undef UPDATE_PARAMS
#undef get16
#undef get32
#undef put16
#undef put32