From 3270120d16405169c0ceef02961fb6033bcde735 Mon Sep 17 00:00:00 2001
From: "B. Petersen" <r10s@b44t.com>
Date: Wed, 9 Oct 2019 19:00:54 +0200
Subject: [PATCH] strncasecmp() compares the given number of characters but not
 after a 0-byte

---
 mmime/src/other.rs | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/mmime/src/other.rs b/mmime/src/other.rs
index 20cd0ad93..a15d8275b 100644
--- a/mmime/src/other.rs
+++ b/mmime/src/other.rs
@@ -8,7 +8,7 @@ use crate::mailmime::types_helper::*;
 
 pub(crate) use libc::{
     calloc, close, free, isalpha, isdigit, malloc, memcmp, memcpy, memmove, memset, realloc,
-    strcpy, strlen, strncmp, strncpy,
+    strcpy, strlen, strncmp, strncpy, strnlen,
 };
 
 pub(crate) unsafe fn strcasecmp(s1: *const libc::c_char, s2: *const libc::c_char) -> libc::c_int {
@@ -40,8 +40,14 @@ pub(crate) unsafe fn strncasecmp(
 
     // s1 and s2 might not be null terminated.
 
-    let s1_slice = std::slice::from_raw_parts(s1 as *const u8, n);
-    let s2_slice = std::slice::from_raw_parts(s2 as *const u8, n);
+    let s1_slice = std::slice::from_raw_parts(
+        s1 as *const u8,
+        std::cmp::min(n, strnlen(s1 as *const i8, n)),
+    );
+    let s2_slice = std::slice::from_raw_parts(
+        s2 as *const u8,
+        std::cmp::min(n, strnlen(s2 as *const i8, n)),
+    );
 
     let s1 = std::ffi::CStr::from_bytes_with_nul_unchecked(s1_slice)
         .to_string_lossy()
@@ -1693,6 +1699,14 @@ mod tests {
                 4,
             )
         });
+
+        assert_eq!(0, unsafe {
+            strncasecmp(
+                CString::new("hell").unwrap().as_ptr(),
+                CString::new("Hell").unwrap().as_ptr(),
+                100_000_000,
+            )
+        });
     }
 
     #[test]