Move inline_strstr.h crash to entrypoints

Author: alyyelashram

libc/src/string/strcasestr.cpp

@@ -11,6 +11,7 @@
 #include "src/__support/common.h"
 #include "src/__support/ctype_utils.h"
 #include "src/__support/macros/config.h"
+#include "src/__support/macros/null_check.h"
 #include "src/string/memory_utils/inline_strstr.h"
 
 namespace LIBC_NAMESPACE_DECL {
@@ -23,6 +24,9 @@ LLVM_LIBC_FUNCTION(char *, strcasestr,
     return LIBC_NAMESPACE::internal::tolower(a) -
            LIBC_NAMESPACE::internal::tolower(b);
   };
+
+  LIBC_CRASH_ON_NULLPTR(haystack);
+  LIBC_CRASH_ON_NULLPTR(needle);
   return inline_strstr(haystack, needle, case_cmp);
 }
 

libc/src/string/strstr.cpp

@@ -10,6 +10,7 @@
 
 #include "src/__support/common.h"
 #include "src/__support/macros/config.h"
+#include "src/__support/macros/null_check.h"
 #include "src/string/memory_utils/inline_strstr.h"
 
 namespace LIBC_NAMESPACE_DECL {
@@ -18,6 +19,8 @@ namespace LIBC_NAMESPACE_DECL {
 // improved upon using well known string matching algorithms.
 LLVM_LIBC_FUNCTION(char *, strstr, (const char *haystack, const char *needle)) {
   auto comp = [](char l, char r) -> int { return l - r; };
+  LIBC_CRASH_ON_NULLPTR(haystack);
+  LIBC_CRASH_ON_NULLPTR(needle);
   return inline_strstr(haystack, needle, comp);
 }