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| -rw-r--r-- | lib/memmove.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/lib/memmove.c b/lib/memmove.c new file mode 100644 index 000000000..d9d9e077e --- /dev/null +++ b/lib/memmove.c @@ -0,0 +1,19 @@ +/* memmove.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 +memmove (dest, source, length) + char *dest, *source; + 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++; +} |