[libc] wmemcmp nullptr handling

[sribee8]

Added nullptr handling for wmemcmp

[llvmbot]

@llvm/pr-subscribers-libc

Author: None (sribee8)

Changes

Added nullptr handling for wmemcmp

---

Full diff: https://github.com/llvm/llvm-project/pull/142058.diff

1 Files Affected:

• (modified) libc/src/wchar/wmemcmp.cpp (+3)

diff --git a/libc/src/wchar/wmemcmp.cpp b/libc/src/wchar/wmemcmp.cpp
index f2fa361c69798..374f3d5ddb627 100644
--- a/libc/src/wchar/wmemcmp.cpp
+++ b/libc/src/wchar/wmemcmp.cpp
@@ -12,11 +12,14 @@
 #include "hdr/types/wchar_t.h"
 #include "src/__support/common.h"
 #include "src/__support/macros/config.h"
+#include "src/__support/macros/null_check.h" // LIBC_CRASH_ON_NULLPTR
 
 namespace LIBC_NAMESPACE_DECL {
 
 LLVM_LIBC_FUNCTION(int, wmemcmp,
                    (const wchar_t *s1, const wchar_t *s2, size_t n)) {
+  LIBC_CRASH_ON_NULLPTR(s1);
+  LIBC_CRASH_ON_NULLPTR(s2);
   for (size_t i = 0; i < n; ++i) {
     if (s1[i] != s2[i])
       return (int)(s1[i] - s2[i]);

[michaelrj-google]

LGTM, waiting for @lntue to approve

[lntue]

Can you sync pass #142085 and add death tests for these cases?

[michaelrj-google]

LGTM