diff options
Diffstat (limited to 'src/core')
| -rw-r--r-- | src/core/string.c | 25 |
1 files changed, 20 insertions, 5 deletions
diff --git a/src/core/string.c b/src/core/string.c index 5bd9dae8b..c35015b59 100644 --- a/src/core/string.c +++ b/src/core/string.c @@ -52,7 +52,7 @@ void * generic_memset ( void *dest, int character, size_t len ) { } /** - * Copy memory region + * Copy memory region (forwards) * * @v dest Destination region * @v src Source region @@ -69,25 +69,40 @@ void * generic_memcpy ( void *dest, const void *src, size_t len ) { } /** - * Copy (possibly overlapping) memory region + * Copy memory region (backwards) * * @v dest Destination region * @v src Source region * @v len Length * @ret dest Destination region */ -void * generic_memmove ( void *dest, const void *src, size_t len ) { +void * generic_memcpy_reverse ( void *dest, const void *src, size_t len ) { const uint8_t *src_bytes = ( src + len ); uint8_t *dest_bytes = ( dest + len ); - if ( dest < src ) - return generic_memcpy ( dest, src, len ); while ( len-- ) *(--dest_bytes) = *(--src_bytes); return dest; } /** + * Copy (possibly overlapping) memory region + * + * @v dest Destination region + * @v src Source region + * @v len Length + * @ret dest Destination region + */ +void * generic_memmove ( void *dest, const void *src, size_t len ) { + + if ( dest < src ) { + return generic_memcpy ( dest, src, len ); + } else { + return generic_memcpy_reverse ( dest, src, len ); + } +} + +/** * Compare memory regions * * @v first First region |