From b04d719c1067dd1cf9b48295f1d0e7ed5adb7255 Mon Sep 17 00:00:00 2001
From: Nick Mathewson <nickm@torproject.org>
Date: Tue, 10 Jul 2018 10:23:29 -0400
Subject: [PATCH] Integrate getdelim() and getline() support into Tor.

---
 configure.ac            |  2 ++
 src/ext/getdelim.c      | 16 ++++++----------
 src/lib/fs/.may_include |  3 +++
 src/lib/fs/files.c      |  4 ++++
 src/lib/fs/files.h      | 34 ++++++++++++++++++++++++++++++++++
 5 files changed, 49 insertions(+), 10 deletions(-)

diff --git a/configure.ac b/configure.ac
index 296591f025..ff03cf10e9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -585,7 +585,9 @@ AC_CHECK_FUNCS(
         ftime \
         get_current_dir_name \
         getaddrinfo \
+	getdelim \
         getifaddrs \
+	getline \
         getpass \
         getrlimit \
         gettimeofday \
diff --git a/src/ext/getdelim.c b/src/ext/getdelim.c
index 60df7e1b64..8254103ff9 100644
--- a/src/ext/getdelim.c
+++ b/src/ext/getdelim.c
@@ -30,21 +30,19 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include <nbcompat.h>
-#include <nbcompat/stdio.h>
-#include <nbcompat/stdlib.h>
-
-#if !HAVE_GETDELIM
+#ifndef BUFSIZ
+#define BUFSIZ 512
+#endif
 
 ssize_t
-getdelim(char **buf, size_t *bufsiz, int delimiter, FILE *fp)
+compat_getdelim_(char **buf, size_t *bufsiz, int delimiter, FILE *fp)
 {
 	char *ptr, *eptr;
 
 
 	if (*buf == NULL || *bufsiz == 0) {
 		*bufsiz = BUFSIZ;
-		if ((*buf = malloc(*bufsiz)) == NULL)
+		if ((*buf = raw_malloc(*bufsiz)) == NULL)
 			return -1;
 	}
 
@@ -69,7 +67,7 @@ getdelim(char **buf, size_t *bufsiz, int delimiter, FILE *fp)
 			char *nbuf;
 			size_t nbufsiz = *bufsiz * 2;
 			ssize_t d = ptr - *buf;
-			if ((nbuf = realloc(*buf, nbufsiz)) == NULL)
+			if ((nbuf = raw_realloc(*buf, nbufsiz)) == NULL)
 				return -1;
 			*buf = nbuf;
 			*bufsiz = nbufsiz;
@@ -78,5 +76,3 @@ getdelim(char **buf, size_t *bufsiz, int delimiter, FILE *fp)
 		}
 	}
 }
-
-#endif
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