From 1e2da75bad39c606cb343ccfe7422a758036e5c5 Mon Sep 17 00:00:00 2001
From: David Carlier <devnexen@gmail.com>
Date: Sun, 8 Dec 2024 22:20:59 +0000
Subject: [PATCH] adding POSIX memccpy and mempcpy GNU extension.

[memccpy](https://pubs.opengroup.org/onlinepubs/9699919799/functions/memccpy.html)

[mempcpy](https://man7.org/linux/man-pages/man3/mempcpy.3.html)

(backport <https://github.com/rust-lang/libc/pull/4186>)
(cherry picked from commit ba5930dbc20dba0dbb3d39496313f6be4468cf01)
---
 libc-test/semver/linux-gnu.txt       | 1 +
 libc-test/semver/unix.txt            | 1 +
 src/unix/linux_like/linux/gnu/mod.rs | 2 ++
 src/unix/mod.rs                      | 1 +
 4 files changed, 5 insertions(+)

diff --git a/libc-test/semver/linux-gnu.txt b/libc-test/semver/linux-gnu.txt
index a6d6b6bf59d88..2aed5d7628eae 100644
--- a/libc-test/semver/linux-gnu.txt
+++ b/libc-test/semver/linux-gnu.txt
@@ -650,6 +650,7 @@ malloc_stats
 malloc_trim
 malloc_usable_size
 mallopt
+mempcpy
 mq_notify
 nl_mmap_hdr
 nl_mmap_req
diff --git a/libc-test/semver/unix.txt b/libc-test/semver/unix.txt
index 093dde173137c..052c24178dfcc 100644
--- a/libc-test/semver/unix.txt
+++ b/libc-test/semver/unix.txt
@@ -638,6 +638,7 @@ localtime_r
 lseek
 lstat
 malloc
+memccpy
 memchr
 memcmp
 memcpy
diff --git a/src/unix/linux_like/linux/gnu/mod.rs b/src/unix/linux_like/linux/gnu/mod.rs
index 0d0278de2c8b3..75ac2e088f7d9 100644
--- a/src/unix/linux_like/linux/gnu/mod.rs
+++ b/src/unix/linux_like/linux/gnu/mod.rs
@@ -1539,6 +1539,8 @@ extern "C" {
         timeout: *const crate::timespec,
         sigmask: *const crate::sigset_t,
     ) -> c_int;
+
+    pub fn mempcpy(dest: *mut c_void, src: *const c_void, n: size_t) -> *mut c_void;
 }
 
 cfg_if! {
diff --git a/src/unix/mod.rs b/src/unix/mod.rs
index 661405f50eb1d..a14dafdf06d9e 100644
--- a/src/unix/mod.rs
+++ b/src/unix/mod.rs
@@ -681,6 +681,7 @@ extern "C" {
     pub fn memcpy(dest: *mut c_void, src: *const c_void, n: size_t) -> *mut c_void;
     pub fn memmove(dest: *mut c_void, src: *const c_void, n: size_t) -> *mut c_void;
     pub fn memset(dest: *mut c_void, c: c_int, n: size_t) -> *mut c_void;
+    pub fn memccpy(dest: *mut c_void, src: *const c_void, c: c_int, n: size_t) -> *mut c_void;
 }
 
 extern "C" {