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authorUlrich Drepper <drepper@redhat.com>2000-03-28 17:18:18 +0000
committerUlrich Drepper <drepper@redhat.com>2000-03-28 17:18:18 +0000
commitb35e58e479cd23ff64ad83a30c6670e355a7d642 (patch)
treea46699058a188da80c1b7bde5881c9db126a5afc /iconv
parent26c400e68954d77fef1701e4c39e13b6b2b95343 (diff)
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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.
Diffstat (limited to 'iconv')
-rw-r--r--iconv/loop.c98
1 files changed, 95 insertions, 3 deletions
diff --git a/iconv/loop.c b/iconv/loop.c
index 5c5948f..9af06bc 100644
--- a/iconv/loop.c
+++ b/iconv/loop.c
@@ -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