FreeBSD compat

Signed-off-by: Chris Rees <utisoft@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

include/libbb.h

@@ -38,6 +38,12 @@
 #include <time.h>
 #include <unistd.h>
 #include <sys/param.h>
+#ifndef HAVE_CLEARENV
+# define clearenv() do { if (environ) environ[0] = NULL; } while (0)
+#endif
+#ifndef HAVE_FDATASYNC
+# define fdatasync fsync
+#endif
 #ifdef HAVE_MNTENT_H
 # include <mntent.h>
 #endif

include/platform.h

@@ -10,9 +10,12 @@
 /* Assume all these functions exist by default.  Platforms where it is not
  * true will #undef them below.
  */
+#define HAVE_CLEARENV 1
+#define HAVE_FDATASYNC 1
 #define HAVE_FDPRINTF 1
 #define HAVE_MEMRCHR 1
 #define HAVE_MKDTEMP 1
+#define HAVE_PTSNAME_R 1
 #define HAVE_SETBIT 1
 #define HAVE_SIGHANDLER_T 1
 #define HAVE_STRCASESTR 1
@@ -253,7 +256,10 @@ typedef uint32_t bb__aliased_uint32_t FIX_ALIASING;
 #if (defined __digital__ && defined __unix__) \
  || defined __APPLE__ \
  || defined __FreeBSD__ || defined __OpenBSD__ || defined __NetBSD__
+# undef HAVE_CLEARENV
+# undef HAVE_FDATASYNC
 # undef HAVE_MNTENT_H
+# undef HAVE_PTSNAME_R
 # undef HAVE_SYS_STATFS_H
 # undef HAVE_SIGHANDLER_T
 #else

libbb/getpty.c

@@ -19,7 +19,7 @@ int FAST_FUNC xgetpty(char *line)
 	if (p > 0) {
 		grantpt(p); /* chmod+chown corresponding slave pty */
 		unlockpt(p); /* (what does this do?) */
-#if 0 /* if ptsname_r is not available... */
+#ifndef HAVE_PTSNAME_R
 		const char *name;
 		name = ptsname(p); /* find out the name of slave pty */
 		if (!name) {