emulated strnlen for macOS before 10.7

Author: catap

src/llvm-project/llvm/lib/ObjectYAML/MachOYAML.cpp

@@ -21,6 +21,20 @@
 #include <cstdint>
 #include <cstring>
 
+#ifdef __APPLE__
+#include <Availability.h>
+#if __MAC_OS_X_VERSION_MIN_REQUIRED < 1070
+static size_t strnlen(const char *s, size_t maxlen) {
+  size_t l = 0;
+  while (l < maxlen && *s) {
+    l++;
+    s++;
+  }
+  return l;
+}
+#endif
+#endif
+
 namespace llvm {
 
 MachOYAML::LoadCommand::~LoadCommand() = default;

src/llvm-project/llvm/tools/llvm-objcopy/MachO/MachOReader.cpp

@@ -13,6 +13,20 @@
 #include "llvm/Support/Errc.h"
 #include <memory>
 
+#ifdef __APPLE__
+#include <Availability.h>
+#if __MAC_OS_X_VERSION_MIN_REQUIRED < 1070
+static size_t strnlen(const char *s, size_t maxlen) {
+  size_t l = 0;
+  while (l < maxlen && *s) {
+    l++;
+    s++;
+  }
+  return l;
+}
+#endif
+#endif
+
 namespace llvm {
 namespace objcopy {
 namespace macho {

src/llvm-project/llvm/tools/llvm-readobj/ObjDumper.cpp

@@ -20,6 +20,20 @@
 #include "llvm/Support/raw_ostream.h"
 #include <map>
 
+#ifdef __APPLE__
+#include <Availability.h>
+#if __MAC_OS_X_VERSION_MIN_REQUIRED < 1070
+static size_t strnlen(const char *s, size_t maxlen) {
+  size_t l = 0;
+  while (l < maxlen && *s) {
+    l++;
+    s++;
+  }
+  return l;
+}
+#endif
+#endif
+
 namespace llvm {
 
 static inline Error createError(const Twine &Msg) {

src/llvm-project/llvm/tools/obj2yaml/macho2yaml.cpp

@@ -15,7 +15,21 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/LEB128.h"
 
-#include <string.h> // for memcpy
+#include <string.h> // for memcpy and strnlen
+
+#ifdef __APPLE__
+#include <Availability.h>
+#if __MAC_OS_X_VERSION_MIN_REQUIRED < 1070
+static size_t strnlen(const char *s, size_t maxlen) {
+  size_t l = 0;
+  while (l < maxlen && *s) {
+    l++;
+    s++;
+  }
+  return l;
+}
+#endif
+#endif
 
 using namespace llvm;