Add a new interceptor for nl_langinfo(3) from NetBSD

[krytarowski]

Summary

nl_langinfo - gets locale information.

Add a dedicated test.

[vitalybuka]

LGTM

lib/sanitizer_common/sanitizer_common_interceptors.inc

INTERCEPTOR(int, sysctlgetmibinfo, char *sname, int *name,
   return res;
 }
 #define INIT_SYSCTLGETMIBINFO                  \
   COMMON_INTERCEPT_FUNCTION(sysctlgetmibinfo);
 #else
 #define INIT_SYSCTLGETMIBINFO
 #endif
 
+#if SANITIZER_INTERCEPT_NL_LANGINFO
+INTERCEPTOR(char *, nl_langinfo, long item) {
+  void *ctx;
+  COMMON_INTERCEPTOR_ENTER(ctx, nl_langinfo, item);
+  char *ret = REAL(nl_langinfo)(item);
+  if (ret)
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ret, REAL(strlen)(ret) + 1);
+  return ret;
+}
+#define INIT_NL_LANGINFO COMMON_INTERCEPT_FUNCTION(nl_langinfo)
+#else
+#define INIT_NL_LANGINFO
+#endif
 
 static void InitializeCommonInterceptors() {
   static u64 metadata_mem[sizeof(MetadataHashMap) / sizeof(u64) + 1];
   interceptor_metadata_map = new((void *)&metadata_mem) MetadataHashMap();
 
   INIT_MMAP;
   INIT_MMAP64;
   INIT_TEXTDOMAIN;
static void InitializeCommonInterceptors() {
   INIT_MI_VECTOR_HASH;
   INIT_SETVBUF;
   INIT_GETVFSSTAT;
   INIT_REGEX;
   INIT_FTS;
   INIT_SYSCTL;
   INIT_ASYSCTL;
   INIT_SYSCTLGETMIBINFO;
+  INIT_NL_LANGINFO;
 
   INIT___PRINTF_CHK;
 }

lib/sanitizer_common/sanitizer_platform_interceptors.h

 #define SANITIZER_INTERCEPT_STRMODE (SI_NETBSD || SI_FREEBSD)
 #define SANITIZER_INTERCEPT_TTYENT SI_NETBSD
 #define SANITIZER_INTERCEPT_PROTOENT SI_NETBSD
 #define SANITIZER_INTERCEPT_NETENT SI_NETBSD
 #define SANITIZER_INTERCEPT_SETVBUF (SI_NETBSD || SI_FREEBSD || \
   SI_LINUX || SI_MAC)
 #define SANITIZER_INTERCEPT_GETMNTINFO SI_NETBSD
 #define SANITIZER_INTERCEPT_MI_VECTOR_HASH SI_NETBSD
+#define SANITIZER_INTERCEPT_NL_LANGINFO SI_NETBSD
 #define SANITIZER_INTERCEPT_GETVFSSTAT SI_NETBSD
 #define SANITIZER_INTERCEPT_REGEX SI_NETBSD
 #define SANITIZER_INTERCEPT_FTS SI_NETBSD
 #define SANITIZER_INTERCEPT_SYSCTL (SI_NETBSD || SI_FREEBSD)
 #define SANITIZER_INTERCEPT_ASYSCTL SI_NETBSD
 #define SANITIZER_INTERCEPT_SYSCTLGETMIBINFO SI_NETBSD
 
 #endif  // #ifndef SANITIZER_PLATFORM_INTERCEPTORS_H

test/sanitizer_common/TestCases/NetBSD/nl_langinfo.cc

+// RUN: %clangxx -O0 -g %s -o %t && %run %t 2>&1 | FileCheck %s
+
+#include <langinfo.h>
+
+#include <stdio.h>
+
+int main(void) {
+  printf("nl_langinfo\n");
+
+  char *info = nl_langinfo(DAY_1);
+
+  printf("DAY_1='%s'\n", info);
+
+  // CHECK: nl_langinfo
+  // CHECK: DAY_1='{{.*}}'
+
+  return 0;
+}