X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=compat%2Fnrand48.c;h=67f3fdb8f9fd46efefdc7cf2242e157002d0498c;hb=dce22e6988beba8949e2973de710e7c272579be3;hp=020417e4cb9f993a009d13427822c616960fd15a;hpb=df9356f54bd6396447e2a465b8efda2fdbd21147;p=vlc

diff --git a/compat/nrand48.c b/compat/nrand48.c
index 020417e4cb..67f3fdb8f9 100644
--- a/compat/nrand48.c
+++ b/compat/nrand48.c
@@ -1,21 +1,21 @@
 /*****************************************************************************
- * nrand48.c: POSIX nrand48() replacement
+ * nrand48.c: POSIX erand48(), jrand48() and nrand48() replacements
  *****************************************************************************
  * Copyright © 2010 Rémi Denis-Courmont
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License as published
- * by the Free Software Foundation; either version 2.1 of the License, or
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  *****************************************************************************/
 
 #ifdef HAVE_CONFIG_H
@@ -24,7 +24,7 @@
 
 #include <inttypes.h>
 
-long nrand48 (unsigned short subi[3])
+static uint64_t iterate48 (unsigned short subi[3])
 {
     const uint64_t a = UINT64_C(0x5DEECE66D);
     const unsigned c = 13;
@@ -42,5 +42,21 @@ long nrand48 (unsigned short subi[3])
     subi[1] = (x >> 16) & 0xFFFF;
     subi[2] = (x >>  0) & 0XFFFF;
 
-    return x >> 17;
+    return x;
+}
+
+double erand48 (unsigned short subi[3])
+{
+    uint64_t r = iterate48 (subi);
+    return ((double)r) / 281474976710655.;
+}
+
+long jrand48 (unsigned short subi[3])
+{
+    return ((int64_t)iterate48 (subi)) >> 16;
+}
+
+long nrand48 (unsigned short subi[3])
+{
+    return iterate48 (subi) >> 17;
 }