Extract strlcpy and strlcmp to libtor-string

src/common/.may_include

@@ -8,7 +8,5 @@ linux_syscalls.inc
 micro-revision.i
 siphash.h
 src/ext/timeouts/timeout.c
-strlcat.c
-strlcpy.c
 tor_queue.h
 tor_readpassphrase.h

src/common/compat.c

@@ -131,14 +131,6 @@ SecureZeroMemory(PVOID ptr, SIZE_T cnt)
 #include "common/address.h"
 #include "common/sandbox.h"
 
-/* Inline the strl functions if the platform doesn't have them. */
-#ifndef HAVE_STRLCPY
-#include "strlcpy.c"
-#endif
-#ifndef HAVE_STRLCAT
-#include "strlcat.c"
-#endif
-
 /* When set_max_file_descriptors() is called, update this with the max file
  * descriptor value so we can use it to check the limit when opening a new
  * socket. Default value is what Debian sets as the default hard limit. */

src/common/compat.h

@@ -48,6 +48,7 @@
 #include "lib/cc/compat_compiler.h"
 #include "common/compat_time.h"
 #include "lib/string/compat_ctype.h"
+#include "lib/string/compat_string.h"
 #include "lib/string/printf.h"
 
 #include <stdio.h>
@@ -55,31 +56,6 @@
 
 /* ===== Compiler compatibility */
 
-/* ===== String compatibility */
-#ifdef _WIN32
-/* Windows names string functions differently from most other platforms. */
-#define strncasecmp _strnicmp
-#define strcasecmp _stricmp
-#endif
-
-#if defined __APPLE__
-/* On OSX 10.9 and later, the overlap-checking code for strlcat would
- * appear to have a severe bug that can sometimes cause aborts in Tor.
- * Instead, use the non-checking variants.  This is sad.
- *
- * See https://trac.torproject.org/projects/tor/ticket/15205
- */
-#undef strlcat
-#undef strlcpy
-#endif /* defined __APPLE__ */
-
-#ifndef HAVE_STRLCAT
-size_t strlcat(char *dst, const char *src, size_t siz) ATTR_NONNULL((1,2));
-#endif
-#ifndef HAVE_STRLCPY
-size_t strlcpy(char *dst, const char *src, size_t siz) ATTR_NONNULL((1,2));
-#endif
-
 /** Represents an mmaped file. Allocated via tor_mmap_file; freed with
  * tor_munmap_file. */
 typedef struct tor_mmap_t {

src/lib/string/.may_include

@@ -4,3 +4,6 @@ lib/err/*.h
 lib/malloc/*.h
 lib/ctime/*.h
 lib/string/*.h
+
+strlcat.c
+strlcpy.c

src/lib/string/compat_string.c

+/* Copyright (c) 2003-2004, Roger Dingledine
+ * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
+ * Copyright (c) 2007-2018, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+#include "lib/string/compat_string.h"
+
+/* Inline the strl functions if the platform doesn't have them. */
+#ifndef HAVE_STRLCPY
+#include "strlcpy.c"
+#endif
+#ifndef HAVE_STRLCAT
+#include "strlcat.c"
+#endif

src/lib/string/compat_string.h

+/* Copyright (c) 2003-2004, Roger Dingledine
+ * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
+ * Copyright (c) 2007-2018, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+#ifndef TOR_COMPAT_STRING_H
+#define TOR_COMPAT_STRING_H
+
+#include "orconfig.h"
+#include "lib/cc/compat_compiler.h"
+
+#include <stddef.h>
+
+/* ===== String compatibility */
+#ifdef _WIN32
+/* Windows names string functions differently from most other platforms. */
+#define strncasecmp _strnicmp
+#define strcasecmp _stricmp
+#endif
+
+#if defined __APPLE__
+/* On OSX 10.9 and later, the overlap-checking code for strlcat would
+ * appear to have a severe bug that can sometimes cause aborts in Tor.
+ * Instead, use the non-checking variants.  This is sad.
+ *
+ * See https://trac.torproject.org/projects/tor/ticket/15205
+ */
+#undef strlcat
+#undef strlcpy
+#endif /* defined __APPLE__ */
+
+#ifndef HAVE_STRLCAT
+size_t strlcat(char *dst, const char *src, size_t siz) ATTR_NONNULL((1,2));
+#endif
+#ifndef HAVE_STRLCPY
+size_t strlcpy(char *dst, const char *src, size_t siz) ATTR_NONNULL((1,2));
+#endif
+
+#endif

src/lib/string/include.am

@@ -7,6 +7,7 @@ endif
 
 src_lib_libtor_string_a_SOURCES =			\
 	src/lib/string/compat_ctype.c			\
+	src/lib/string/compat_string.c			\
 	src/lib/string/util_string.c			\
 	src/lib/string/printf.c				\
 	src/lib/string/scanf.c
@@ -18,6 +19,7 @@ src_lib_libtor_string_testing_a_CFLAGS = $(AM_CFLAGS) $(TEST_CFLAGS)
 
 noinst_HEADERS +=					\
 	src/lib/string/compat_ctype.h			\
+	src/lib/string/compat_string.h			\
 	src/lib/string/util_string.h			\
 	src/lib/string/printf.h				\
 	src/lib/string/scanf.h