Index: llvm/trunk/test/tools/llvm-strings/negative-char.test
===================================================================
--- llvm/trunk/test/tools/llvm-strings/negative-char.test
+++ llvm/trunk/test/tools/llvm-strings/negative-char.test
@@ -0,0 +1,3 @@
+# RUN: echo -e "z\0\x80\0a\0" | llvm-strings --bytes 1 - | FileCheck %s
+# CHECK: z{{$}}
+# CHECK-NEXT: {{^}} a
Index: llvm/trunk/tools/llvm-strings/llvm-strings.cpp
===================================================================
--- llvm/trunk/tools/llvm-strings/llvm-strings.cpp
+++ llvm/trunk/tools/llvm-strings/llvm-strings.cpp
@@ -80,7 +80,7 @@
   const char *B = Contents.begin();
   const char *P = nullptr, *E = nullptr, *S = nullptr;
   for (P = Contents.begin(), E = Contents.end(); P < E; ++P) {
-    if (std::isgraph(*P) || std::isblank(*P)) {
+    if (isPrint(*P) || *P == '\t') {
       if (S == nullptr)
         S = P;
     } else if (S) {