1 files changed, 44 insertions, 0 deletions
diff --git a/vendor/memchr/src/memchr/c.rs b/vendor/memchr/src/memchr/c.rs
new file mode 100644
index 000000000..608aabc98
--- /dev/null
+++ b/vendor/memchr/src/memchr/c.rs
@@ -0,0 +1,44 @@
+// This module defines safe wrappers around memchr (POSIX) and memrchr (GNU
+// extension).
+
+#![allow(dead_code)]
+
+use libc::{c_int, c_void, size_t};
+
+pub fn memchr(needle: u8, haystack: &[u8]) -> Option<usize> {
+    // SAFETY: This is safe to call since all pointers are valid.
+    let p = unsafe {
+        libc::memchr(
+            haystack.as_ptr() as *const c_void,
+            needle as c_int,
+            haystack.len() as size_t,
+        )
+    };
+    if p.is_null() {
+        None
+    } else {
+        Some(p as usize - (haystack.as_ptr() as usize))
+    }
+}
+
+// memrchr is a GNU extension. We know it's available on Linux at least.
+#[cfg(target_os = "linux")]
+pub fn memrchr(needle: u8, haystack: &[u8]) -> Option<usize> {
+    // GNU's memrchr() will - unlike memchr() - error if haystack is empty.
+    if haystack.is_empty() {
+        return None;
+    }
+    // SAFETY: This is safe to call since all pointers are valid.
+    let p = unsafe {
+        libc::memrchr(
+            haystack.as_ptr() as *const c_void,
+            needle as c_int,
+            haystack.len() as size_t,
+        )
+    };
+    if p.is_null() {
+        None
+    } else {
+        Some(p as usize - (haystack.as_ptr() as usize))
+    }
+}