diff options
Diffstat (limited to 'string')
| -rw-r--r-- | string/bits/string2.h | 147 |
1 files changed, 146 insertions, 1 deletions
diff --git a/string/bits/string2.h b/string/bits/string2.h index 8051c48162..172c21734a 100644 --- a/string/bits/string2.h +++ b/string/bits/string2.h @@ -101,6 +101,151 @@ __STRING2_COPY_TYPE (8); #endif +/* Copy N bytes from SRC to DEST, returning pointer to byte following the + last copied. */ +#ifdef __USE_GNU +# ifndef _HAVE_STRING_ARCH_mempcpy +# define __mempcpy(dest, src, n) \ + (__extension__ (__builtin_constant_p (src) && __builtin_constant_p (n) \ + && __string2_1bptr_p (src) && n <= 8 \ + ? __mempcpy_small (dest, src, n) \ + : __mempcpy (dest, src, n))) +/* In glibc we use this function frequently but for namespace reasons + we have to use the name `__mempcpy'. */ +# define mempcpy(dest, src, n) __mempcpy (dest, src, n) + +# if _STRING_ARCH_unaligned +# define __mempcpy_small(dest, src, srclen) \ + (__extension__ ({ char *__dest = (char *) (dest); \ + switch (srclen) \ + { \ + case 1: \ + *__dest++ = *(char *) src; \ + break; \ + case 2: \ + *((__uint16_t *) __dest) = \ + __STRING2_SMALL_GET16 (src, 0); \ + __dest += 2; \ + break; \ + case 3: \ + *((__uint16_t *) __dest) = \ + __STRING2_SMALL_GET16 (src, 0); \ + __dest += sizeof (__uint16_t); \ + *__dest++ = ((char *) src)[2]; \ + break; \ + case 4: \ + *((__uint32_t *) __dest) = \ + __STRING2_SMALL_GET32 (src, 0); \ + __dest += 4; \ + break; \ + case 5: \ + *((__uint32_t *) __dest) = \ + __STRING2_SMALL_GET32 (src, 0); \ + __dest += 4; \ + *__dest++ = ((char *) src)[4]; \ + break; \ + case 6: \ + *((__uint32_t *) __dest) = \ + __STRING2_SMALL_GET32 (src, 0); \ + *((__uint16_t *) (__dest + 4)) = \ + __STRING2_SMALL_GET16 (src, 4); \ + __dest += 6; \ + break; \ + case 7: \ + *((__uint32_t *) __dest) = \ + __STRING2_SMALL_GET32 (src, 0); \ + *((__uint16_t *) (__dest + 4)) = \ + __STRING2_SMALL_GET16 (src, 4); \ + __dest += 6; \ + *__dest++ = ((char *) src)[6]; \ + break; \ + case 8: \ + *((__uint32_t *) __dest) = \ + __STRING2_SMALL_GET32 (src, 0); \ + *((__uint32_t *) (__dest + 4)) = \ + __STRING2_SMALL_GET32 (src, 4); \ + __dest += 8; \ + break; \ + } \ + __dest; })) +# else +# define __mempcpy_small(dest, src, srclen) \ + (__extension__ ({ char *__dest = (char *) (dest); \ + switch (srclen) \ + { \ + case 1: \ + *__dest = '\0'; \ + break; \ + case 2: \ + *((__STRING2_COPY_ARR2 *) __dest) = \ + ((__STRING2_COPY_ARR2) \ + { { ((__const char *) (src))[0], \ + ((__const char *) (src))[1] } }); \ + break; \ + case 3: \ + *((__STRING2_COPY_ARR3 *) __dest) = \ + ((__STRING2_COPY_ARR3) \ + { { ((__const char *) (src))[0], \ + ((__const char *) (src))[1], \ + ((__const char *) (src))[2] } }); \ + break; \ + case 4: \ + *((__STRING2_COPY_ARR4 *) __dest) = \ + ((__STRING2_COPY_ARR4) \ + { { ((__const char *) (src))[0], \ + ((__const char *) (src))[1], \ + ((__const char *) (src))[2], \ + ((__const char *) (src))[3] } }); \ + break; \ + case 5: \ + *((__STRING2_COPY_ARR5 *) __dest) = \ + ((__STRING2_COPY_ARR5) \ + { { ((__const char *) (src))[0], \ + ((__const char *) (src))[1], \ + ((__const char *) (src))[2], \ + ((__const char *) (src))[3], \ + ((__const char *) (src))[4] } }); \ + break; \ + case 6: \ + *((__STRING2_COPY_ARR6 *) __dest) = \ + ((__STRING2_COPY_ARR6) \ + { { ((__const char *) (src))[0], \ + ((__const char *) (src))[1], \ + ((__const char *) (src))[2], \ + ((__const char *) (src))[3], \ + ((__const char *) (src))[4], \ + ((__const char *) (src))[5] } }); \ + break; \ + case 7: \ + *((__STRING2_COPY_ARR7 *) __dest) = \ + ((__STRING2_COPY_ARR7) \ + { { ((__const char *) (src))[0], \ + ((__const char *) (src))[1], \ + ((__const char *) (src))[2], \ + ((__const char *) (src))[3], \ + ((__const char *) (src))[4], \ + ((__const char *) (src))[5], \ + ((__const char *) (src))[6] } }); \ + break; \ + case 8: \ + *((__STRING2_COPY_ARR8 *) __dest) = \ + ((__STRING2_COPY_ARR8) \ + { { ((__const char *) (src))[0], \ + ((__const char *) (src))[1], \ + ((__const char *) (src))[2], \ + ((__const char *) (src))[3], \ + ((__const char *) (src))[4], \ + ((__const char *) (src))[5], \ + ((__const char *) (src))[6], \ + ((__const char *) (src))[7] } }); \ + break; \ + } \ + __dest + (srclen); })) +# endif +# endif +#endif + + /* Copy SRC to DEST. */ #ifndef _HAVE_STRING_ARCH_strcpy # define strcpy(dest, src) \ @@ -274,7 +419,7 @@ __STRING2_COPY_TYPE (8); case 5: \ *((__uint32_t *) __dest) = \ __STRING2_SMALL_GET32 (src, 0); \ - __dest += sizeof (__uint32_t); \ + __dest += 4; \ *__dest = '\0'; \ break; \ case 6: \ |