--- /dev/null
+/*****************************************************************************
+ * nrand48.c: POSIX nrand48() replacement
+ *****************************************************************************
+ * 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
+ * (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.
+ *
+ * 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.
+ *****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <inttypes.h>
+
+long nrand48 (unsigned short subi[3])
+{
+ const uint64_t a = UINT64_C(0x5DEECE66D16);
+ const unsigned c = 13;
+ const uint64_t mask = UINT64_C(0xFFFFFFFFFFFF); // 48 bits
+
+ uint64_t x = ((uint64_t)subi[0] << 32)
+ | ((uint32_t)subi[1] << 16)
+ | subi[2];
+
+ x *= a;
+ x += c;
+ x &= mask;
+
+ subi[0] = (x >> 32) & 0xFFFF;
+ subi[1] = (x >> 16) & 0xFFFF;
+ subi[2] = (x >> 0) & 0XFFFF;
+
+ return x >> 16;
+}
dnl Check for usual libc functions
AC_CHECK_FUNCS([ctime_r daemon fcntl fdopendir fork getenv getpwuid_r gettimeofday isatty lstat memalign posix_fadvise posix_madvise posix_memalign putenv setenv setlocale stricmp strnicmp tdestroy uselocale])
-AC_REPLACE_FUNCS([asprintf atof atoll getcwd getpid gmtime_r lldiv localtime_r rewind strcasecmp strcasestr strdup strlcpy strncasecmp strndup strnlen strsep strtof strtok_r strtoll swab vasprintf])
+AC_REPLACE_FUNCS([asprintf atof atoll getcwd getpid gmtime_r lldiv localtime_r nrand48 rewind strcasecmp strcasestr strdup strlcpy strncasecmp strndup strnlen strsep strtof strtok_r strtoll swab vasprintf])
AC_CHECK_FUNCS(fdatasync,,
[AC_DEFINE(fdatasync, fsync, [Alias fdatasync() to fsync() if missing.])
])