From aa7e4cce8e7208a6128054d1917eba0a749fe1f7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C5=8Dshin?= <git@wholezero.org>
Date: Tue, 25 Dec 2018 19:44:59 -0800
Subject: [PATCH] Initial

---
 README.md            |  4 ++++
 include/ent/detail.h | 26 ++++++++++++++++++++++++++
 include/ent/ent.h    | 12 ++++++++++++
 meson.build          | 21 +++++++++++++++++++++
 src/ent.c            | 17 +++++++++++++++++
 5 files changed, 80 insertions(+)
 create mode 100644 README.md
 create mode 100644 include/ent/detail.h
 create mode 100644 include/ent/ent.h
 create mode 100644 meson.build
 create mode 100644 src/ent.c

diff --git a/README.md b/README.md
new file mode 100644
index 000000000..9d7469c59
--- /dev/null
+++ b/README.md
@@ -0,0 +1,4 @@
+libent is a simple cross-platform entropy gathering library. It tries
+to use the best available source of randomness, and is meant to be used
+in applications that need high-quality entropy, e.g. for generating
+cryptographic keys.
diff --git a/include/ent/detail.h b/include/ent/detail.h
new file mode 100644
index 000000000..9eb0e029c
--- /dev/null
+++ b/include/ent/detail.h
@@ -0,0 +1,26 @@
+#ifndef _LIBENT_DETAIL_H
+#define _LIBENT_DETAIL_H
+
+#if defined _WIN32 || defined __CYGWIN__
+# ifdef WIN_EXPORT
+#  ifdef __GNUC__
+#   define ENT_EXPORT __attribute__ ((dllexport))
+#  else
+#   define ENT_EXPORT __declspec(dllexport)
+#  endif
+# else
+#  ifdef __GNUC__
+#   define ENT_EXPORT __attribute__ ((dllimport))
+#  else
+#   define ENT_EXPORT __declspec(dllimport)
+#  endif
+# endif
+#else
+# if __GNUC__ >= 4
+#  define ENT_EXPORT __attribute__ ((visibility ("default")))
+# else
+#  define ENT_EXPORT
+# endif
+#endif
+
+#endif /* _LIBENT_DETAIL_H */
diff --git a/include/ent/ent.h b/include/ent/ent.h
new file mode 100644
index 000000000..c06020dca
--- /dev/null
+++ b/include/ent/ent.h
@@ -0,0 +1,12 @@
+#ifndef _LIBENT_ENT_H
+#define _LIBENT_ENT_H
+
+#include <stddef.h>
+
+#include <ent/detail.h>
+
+ENT_EXPORT
+int
+ent_getentropy(void *buf, size_t buflen);
+
+#endif /* _LIBENT_ENT_H */
diff --git a/meson.build b/meson.build
new file mode 100644
index 000000000..8b660c4cd
--- /dev/null
+++ b/meson.build
@@ -0,0 +1,21 @@
+project('libent', 'c', 'cpp',
+        default_options : ['c_std=c99', 'cpp_std=c++11'],
+        version : '0.0.1',
+        license : 'MIT')
+
+inc = include_directories('include')
+
+install_headers('include/ent/ent.h', subdir : 'ent')
+
+ent_sources = ['src/ent.c']
+libent = shared_library('ent',
+                        ent_sources,
+                        include_directories : inc,
+                        install : true)
+
+pkg_mod = import('pkgconfig')
+pkg_mod.generate(libraries : libent,
+                 version : '0.0',
+                 name : 'libent',
+                 filebase : 'ent',
+                 description : 'A library to get entropy.')
diff --git a/src/ent.c b/src/ent.c
new file mode 100644
index 000000000..4f0ec721b
--- /dev/null
+++ b/src/ent.c
@@ -0,0 +1,17 @@
+#include <ent/ent.h>
+
+#if defined __OPENBSD__ || (defined __linux__ && defined _DEFAULT_SOURCE)
+# include <unistd.h>
+# define getentropy_impl getentropy
+#elif defined __APPLE__ && defined __MACH__
+# include <sys/random.h>
+# define getentropy_impl getentropy
+#else
+# error "Port: getentropy unimplemented"
+#endif
+
+int
+ent_getentropy(void *buf, size_t buflen)
+{
+  return getentropy_impl(buf, buflen);
+}