Added OpenBSD support

Lrzip.h

@@ -29,6 +29,10 @@
 # include <inttypes.h>
 #endif
 
+#if defined (__OpenBSD__) || (__NetBSD__)
+# include <stdarg.h>
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif

lrzip.c

@@ -90,6 +90,32 @@ i64 get_ram(rzip_control *control)
 
 	return ramsize;
 }
+#elif defined(__OpenBSD__)
+# include <sys/resource.h>
+i64 get_ram(rzip_control *control)
+{
+	struct rlimit rl;
+	i64 ramsize = (i64)sysconf(_SC_PHYS_PAGES) * PAGE_SIZE;
+
+	/* Raise limits all the way to the max */
+
+	if (getrlimit(RLIMIT_DATA, &rl) == -1)
+		fatal_return(("Failed to get limits in get_ram\n"), -1);
+
+	rl.rlim_cur = rl.rlim_max;
+	if (setrlimit(RLIMIT_DATA, &rl) == -1)
+		fatal_return(("Failed to set limits in get_ram\n"), -1);
+
+	/* Declare detected RAM to be either the max RAM available from
+	physical memory or the max RAM allowed by RLIMIT_DATA, whatever
+	is smaller, to prevent the heuristics from selecting
+	compression windows which cause lrzip to go into deep swap */
+
+	if (rl.rlim_max < ramsize)
+		return rl.rlim_max;
+
+	return ramsize;
+}
 #else /* __APPLE__ */
 i64 get_ram(rzip_control *control)
 {

lrzip_private.h

@@ -144,7 +144,7 @@ extern int errno;
 #define unlikely(x)	__builtin_expect(!!(x), 0)
 #define __maybe_unused	__attribute__((unused))
 
-#if defined(__MINGW32__) || defined(__CYGWIN__) || defined(__ANDROID__) || defined(__APPLE__)
+#if defined(__MINGW32__) || defined(__CYGWIN__) || defined(__ANDROID__) || defined(__APPLE__) || defined(__OpenBSD__)
 # define ffsll __builtin_ffsll
 #endif