[Sanitizers] intercept fparseln on FreeBSD

[emaste]

LGTM

Do we want to share some of these tests between NetBSD and FreeBSD?

[devnexen]

good suggestion indeed, it might be possible for most of them at least.

compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h

 #define SANITIZER_INTERCEPT_FTS (SI_NETBSD || SI_FREEBSD)
 #define SANITIZER_INTERCEPT_SYSCTL (SI_NETBSD || SI_FREEBSD || SI_MAC)
 #define SANITIZER_INTERCEPT_ASYSCTL SI_NETBSD
 #define SANITIZER_INTERCEPT_SYSCTLGETMIBINFO SI_NETBSD
 #define SANITIZER_INTERCEPT_NL_LANGINFO (SI_NETBSD || SI_FREEBSD || SI_MAC)
 #define SANITIZER_INTERCEPT_MODCTL SI_NETBSD
 #define SANITIZER_INTERCEPT_CAPSICUM SI_FREEBSD
 #define SANITIZER_INTERCEPT_STRTONUM (SI_NETBSD || SI_FREEBSD)
-#define SANITIZER_INTERCEPT_FPARSELN SI_NETBSD
+#define SANITIZER_INTERCEPT_FPARSELN (SI_NETBSD || SI_FREEBSD)
 #define SANITIZER_INTERCEPT_STATVFS1 SI_NETBSD
 #define SANITIZER_INTERCEPT_STRTOI SI_NETBSD
 #define SANITIZER_INTERCEPT_CAPSICUM SI_FREEBSD
 #define SANITIZER_INTERCEPT_SHA1 SI_NETBSD
 #define SANITIZER_INTERCEPT_MD4 SI_NETBSD
 #define SANITIZER_INTERCEPT_RMD160 SI_NETBSD
 #define SANITIZER_INTERCEPT_MD5 SI_NETBSD
 #define SANITIZER_INTERCEPT_FSEEK (SI_NETBSD || SI_FREEBSD)

compiler-rt/test/sanitizer_common/TestCases/FreeBSD/fparseln.cpp

+// RUN: %clangxx -O0 -g %s -o %t -lutil && %run %t 2>&1 | FileCheck %s
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <libutil.h>
+
+int main(void) {
+  printf("fparseln\n");
+
+  FILE *fp = fopen("/etc/fstab", "r");
+  assert(fp);
+
+  int flags = FPARSELN_UNESCALL;
+  const char *delim = "\\\\#";
+  size_t lineno = 0, len;
+  char *line;
+  while ((line = fparseln(fp, &len, &lineno, delim, flags))) {
+    printf("lineno: %zu, length: %zu, line: %s\n", lineno, len, line);
+    free(line);
+  }
+
+  // CHECK: fparseln
+
+  return 0;
+}