3 files changed, 41 insertions, 0 deletions
diff --git a/src/lib/fs/.may_include b/src/lib/fs/.may_include
index 6c9ce6ca04..b1e49fc891 100644
--- a/src/lib/fs/.may_include
+++ b/src/lib/fs/.may_include
@@ -1,4 +1,7 @@
 orconfig.h
+
+ext/getdelim.c
+
 lib/cc/*.h
 lib/container/*.h
 lib/encoding/*.h
diff --git a/src/lib/fs/files.c b/src/lib/fs/files.c
index 4e0a398baa..e93d36d86d 100644
--- a/src/lib/fs/files.c
+++ b/src/lib/fs/files.c
@@ -715,3 +715,7 @@ read_file_to_str, (const char *filename, int flags, struct stat *stat_out))
 
   return string;
 }
+
+#if !defined(HAVE_GETDELIM) || defined(TOR_UNIT_TESTS)
+#include "ext/getdelim.c"
+#endif
diff --git a/src/lib/fs/files.h b/src/lib/fs/files.h
index 5a12eb8215..d219e3cf05 100644
--- a/src/lib/fs/files.h
+++ b/src/lib/fs/files.h
@@ -103,4 +103,38 @@ char *read_file_to_str_until_eof(int fd, size_t max_bytes_to_read,
                                  size_t *sz_out)
   ATTR_MALLOC;
 
+#if !defined(HAVE_GETDELIM) || defined(TOR_UNIT_TESTS)
+ssize_t compat_getdelim_(char **lineptr, size_t *n, int delim, FILE *stream);
+#endif
+
+#ifdef HAVE_GETDELIM
+/**
+ * Cross-platform wrapper for getdelim(): behaves as the POSIX-standard
+ * getdelim() function.
+ *
+ * Note that this function will use the libc memory allocator -- so any memory
+ * passed to this function must come from raw_malloc(), and must be freed by
+ * raw_free() -- don't use tor_malloc() and tor_free() with this.
+ */
+#define tor_getdelim(lineptr, n, delim, stream) \
+  getdelim((lineptr), (n), (delim), (stream))
+#else
+#define tor_getdelim(lineptr, n, delim, stream) \
+  compat_getdelim_((lineptr), (n), (delim), (stream))
+#endif
+
+#ifdef HAVE_GETLINE
+/**
+ * Cross-platform wrapper for getline(): behaves as the POSIX-standard
+ * getline() function.
+ *
+ * See tor_getdelim() for usage notes.
+ */
+#define tor_getline(lineptr, n, stream) \
+  getline((lineptr), (n), (stream))
+#else
+#define tor_getline(lineptr, n, stream) \
+  tor_getdelim((lineptr), (n), '\n', (stream))
+#endif
+
 #endif