| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | #include <unistd.h> |
| 2 | #include <sys/types.h> |
| 3 | #include <byteswap.h> |
| 4 | |
| 5 | /* Updated implementation based on byteswap.h from Miles Bader |
| 6 | * <miles@gnu.org>. This should be much faster on arches with machine |
| 7 | * specific, optimized definitions in include/bits/byteswap.h (i.e. on |
| 8 | * x86, use the bswap instruction on i486 and better boxes). For |
| 9 | * platforms that lack such support, this should be no slower than it |
| 10 | * was before... */ |
| 11 | void swab (const void *source, void *dest, ssize_t count) |
| 12 | { |
| 13 | const unsigned short *from = source, *from_end = from + (count >> 1); |
| 14 | unsigned short junk; |
| 15 | unsigned short *to = dest; |
| 16 | |
| 17 | while (from < from_end) { |
| 18 | /* Don't put '*from++'into the bswap_16() macros |
| 19 | * or mad things will happen on macro expansion */ |
| 20 | junk=*from++; |
| 21 | *to++ = bswap_16 (junk); |
| 22 | } |
| 23 | } |