From 4e09bca9e34c226b6d7e34b4fa11248405fd988e Mon Sep 17 00:00:00 2001 From: Anton Kling Date: Sun, 22 Oct 2023 19:50:38 +0200 Subject: Move everything into a new repo. --- userland/libc/string/memmove.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) create mode 100644 userland/libc/string/memmove.c (limited to 'userland/libc/string/memmove.c') diff --git a/userland/libc/string/memmove.c b/userland/libc/string/memmove.c new file mode 100644 index 0000000..5fc49f7 --- /dev/null +++ b/userland/libc/string/memmove.c @@ -0,0 +1,14 @@ +#include + +// copy bytes in memory with overlapping areas +// https://pubs.opengroup.org/onlinepubs/9699919799/functions/memmove.html +void *memmove(void *s1, const void *s2, size_t n) { + // Copying takes place as if the n bytes from the object pointed to by s2 are + // first copied into a temporary array of n bytes that does not overlap the + // objects pointed to by s1 and s2, and then the n bytes from the temporary + // array are copied into the object pointed to by s1. + unsigned char tmp[n]; + memcpy(tmp, s2, n); + memcpy(s1, tmp, n); + return s1; +} -- cgit v1.2.3