[Sanitizer] Add interceptor for wcsdup

[labath]

Summary

The wide-string equivalent of strdup. Implementation trivial.

compiler-rt/trunk/lib/sanitizer_common/sanitizer_common_interceptors.inc

 }
 #define INIT_WCSCAT                  \
   COMMON_INTERCEPT_FUNCTION(wcscat); \
   COMMON_INTERCEPT_FUNCTION(wcsncat);
 #else
 #define INIT_WCSCAT
 #endif
 
+#if SANITIZER_INTERCEPT_WCSDUP
+INTERCEPTOR(wchar_t *, wcsdup, wchar_t *s) {
+  void *ctx;
+  COMMON_INTERCEPTOR_ENTER(ctx, wcsdup, s);
+  SIZE_T len = REAL(wcslen)(s);
+  COMMON_INTERCEPTOR_READ_RANGE(ctx, s, sizeof(wchar_t) * (len + 1));
+  wchar_t *result = REAL(wcsdup)(s);
+  if (result)
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, result, sizeof(wchar_t) * (len + 1));
+  return result;
+}
+
+#define INIT_WCSDUP COMMON_INTERCEPT_FUNCTION(wcsdup);
+#else
+#define INIT_WCSDUP
+#endif
+
 #if SANITIZER_INTERCEPT_STRXFRM
 static SIZE_T RealStrLen(const char *str) { return REAL(strlen)(str); }
 
 static SIZE_T RealStrLen(const wchar_t *str) { return REAL(wcslen)(str); }
 
 #define STRXFRM_INTERCEPTOR_IMPL(strxfrm, dest, src, len, ...)             \
   {                                                                        \
     void *ctx;                                                             \
static void InitializeCommonInterceptors() {
   INIT___LXSTAT;
   INIT___LXSTAT64;
   // FIXME: add other *stat interceptors.
   INIT_UTMP;
   INIT_UTMPX;
   INIT_GETLOADAVG;
   INIT_WCSLEN;
   INIT_WCSCAT;
+  INIT_WCSDUP;
   INIT_WCSXFRM;
   INIT___WCSXFRM_L;
   INIT_ACCT;
   INIT_USER_FROM_UID;
   INIT_UID_FROM_USER;
   INIT_GROUP_FROM_GID;
   INIT_GID_FROM_GROUP;
   INIT_ACCESS;

compiler-rt/trunk/lib/sanitizer_common/sanitizer_platform_interceptors.h

 #define SANITIZER_INTERCEPT_CFREE \
   (!SI_FREEBSD && !SI_MAC && !SI_NETBSD && !SI_OPENBSD && SI_NOT_FUCHSIA && \
   SI_NOT_RTEMS)
 #define SANITIZER_INTERCEPT_REALLOCARRAY SI_POSIX
 #define SANITIZER_INTERCEPT_ALIGNED_ALLOC (!SI_MAC && SI_NOT_RTEMS)
 #define SANITIZER_INTERCEPT_MALLOC_USABLE_SIZE (!SI_MAC && !SI_OPENBSD)
 #define SANITIZER_INTERCEPT_MCHECK_MPROBE SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_WCSCAT SI_POSIX
+#define SANITIZER_INTERCEPT_WCSDUP SI_POSIX
 #define SANITIZER_INTERCEPT_SIGNAL_AND_SIGACTION (!SI_WINDOWS && SI_NOT_FUCHSIA)
 #define SANITIZER_INTERCEPT_BSD_SIGNAL SI_ANDROID
 
 #define SANITIZER_INTERCEPT_ACCT (SI_NETBSD || SI_OPENBSD || SI_FREEBSD)
 #define SANITIZER_INTERCEPT_USER_FROM_UID SI_NETBSD
 #define SANITIZER_INTERCEPT_UID_FROM_USER SI_NETBSD
 #define SANITIZER_INTERCEPT_GROUP_FROM_GID SI_NETBSD
 #define SANITIZER_INTERCEPT_GID_FROM_GROUP SI_NETBSD

compiler-rt/trunk/test/sanitizer_common/TestCases/Posix/wcsdup.c

+// RUN: %clang %s -o %t && %run %t 2>&1
+
+#include <assert.h>
+#include <stdlib.h>
+#include <wchar.h>
+
+int main(int argc, char **argv) {
+  wchar_t *buff = wcsdup(L"foo");
+  assert(buff[0] == L'f');
+  assert(buff[1] == L'o');
+  assert(buff[2] == L'o');
+  assert(buff[3] == L'\0');
+  free(buff);
+  return 0;
+}