1 files changed, 17 insertions, 0 deletions
diff --git a/lib/sanitizer_common/sanitizer_libc.cc b/lib/sanitizer_common/sanitizer_libc.cc
index d8bd1cf7a7e0..cb162a4c4984 100644
--- a/lib/sanitizer_common/sanitizer_libc.cc
+++ b/lib/sanitizer_common/sanitizer_libc.cc
@@ -28,6 +28,15 @@ void *internal_memchr(const void *s, int c, uptr n) {
   return 0;
 }
 
+void *internal_memrchr(const void *s, int c, uptr n) {
+  const char *t = (const char *)s;
+  void *res = nullptr;
+  for (uptr i = 0; i < n; ++i, ++t) {
+    if (*t == c) res = reinterpret_cast<void *>(const_cast<char *>(t));
+  }
+  return res;
+}
+
 int internal_memcmp(const void* s1, const void* s2, uptr n) {
   const char *t1 = (const char *)s1;
   const char *t2 = (const char *)s2;
@@ -101,6 +110,14 @@ char* internal_strdup(const char *s) {
   return s2;
 }
 
+char* internal_strndup(const char *s, uptr n) {
+  uptr len = internal_strnlen(s, n);
+  char *s2 = (char*)InternalAlloc(len + 1);
+  internal_memcpy(s2, s, len);
+  s2[len] = 0;
+  return s2;
+}
+
 int internal_strcmp(const char *s1, const char *s2) {
   while (true) {
     unsigned c1 = *s1;