From 2c50a224f8c4b716299c4696957959a238f8d794 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rub=C3=A9n=20Llorente?= <rubenllorente@mailfence.com>
Date: Sun, 26 Jun 2022 12:07:40 +0200
Subject: [PATCH] Added OpenBSD support

---
 Lrzip.h         |  4 ++++
 lrzip.c         | 26 ++++++++++++++++++++++++++
 lrzip_private.h |  2 +-
 3 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/Lrzip.h b/Lrzip.h
index 8934c59..7c98998 100644
--- a/Lrzip.h
+++ b/Lrzip.h
@@ -29,6 +29,10 @@
 # include <inttypes.h>
 #endif
 
+#if defined (__OpenBSD__) || (__NetBSD__)
+# include <stdarg.h>
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif
diff --git a/lrzip.c b/lrzip.c
index 3d55db8..bcc04ce 100644
--- a/lrzip.c
+++ b/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)
 {
diff --git a/lrzip_private.h b/lrzip_private.h
index 67ba247..035c529 100644
--- a/lrzip_private.h
+++ b/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