diff options
Diffstat (limited to 'lib/bcopy.c')
-rw-r--r-- | lib/bcopy.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/lib/bcopy.c b/lib/bcopy.c new file mode 100644 index 000000000..a8991c570 --- /dev/null +++ b/lib/bcopy.c @@ -0,0 +1,19 @@ +/* bcopy.c -- copy memory. + Copy LENGTH bytes from SOURCE to DEST. Does not null-terminate. + In the public domain. + By David MacKenzie <djm@gnu.ai.mit.edu>. */ + +void +bcopy (source, dest, length) + char *source, *dest; + unsigned length; +{ + if (source < dest) + /* Moving from low mem to hi mem; start at end. */ + for (source += length, dest += length; length; --length) + *--dest = *--source; + else if (source != dest) + /* Moving from hi mem to low mem; start at beginning. */ + for (; length; --length) + *dest++ = *source++; +} |