From 67fe0450be4776fe16da0bc0dc416cf32b75d85c Mon Sep 17 00:00:00 2001
From: Marko Kreen <markokr@gmail.com>
Date: Tue, 2 Mar 2010 16:43:40 +0200
Subject: [PATCH] base: compat posix_memalign()

---
 m4/usual.m4  |  2 ++
 usual/base.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 usual/base.h |  5 +++++
 3 files changed, 60 insertions(+)
 create mode 100644 usual/base.c

diff --git a/m4/usual.m4 b/m4/usual.m4
index ce03f14..8f15364 100644
--- a/m4/usual.m4
+++ b/m4/usual.m4
@@ -114,6 +114,7 @@ AC_CHECK_HEADERS([arpa/inet.h netinet/in.h netinet/tcp.h])
 AC_CHECK_HEADERS([sys/param.h sys/uio.h libgen.h pwd.h grp.h])
 AC_CHECK_HEADERS([sys/wait.h sys/mman.h syslog.h netdb.h dlfcn.h])
 AC_CHECK_HEADERS([err.h pthread.h endian.h sys/endian.h byteswap.h])
+AC_CHECK_HEADERS([malloc.h])
 dnl ucred.h may have prereqs
 AC_CHECK_HEADERS([ucred.h sys/ucred.h], [], [], [
 #ifdef HAVE_SYS_TYPES_H
@@ -133,6 +134,7 @@ AC_DEFUN([AC_USUAL_FUNCTION_CHECK], [
 AC_CHECK_FUNCS(basename strlcpy strlcat getpeereid sigaction)
 AC_CHECK_FUNCS(inet_ntop poll getline)
 AC_CHECK_FUNCS(err errx warn warnx getprogname setprogname)
+AC_CHECK_FUNCS(posix_memalign memalign valloc)
 ### Functions provided only on win32
 AC_CHECK_FUNCS(localtime_r recvmsg sendmsg)
 ### Functions used by libusual itself
diff --git a/usual/base.c b/usual/base.c
new file mode 100644
index 0000000..ed45156
--- /dev/null
+++ b/usual/base.c
@@ -0,0 +1,53 @@
+/*
+ * Basic C environment.
+ *
+ * Copyright (c) 2007-2009 Marko Kreen
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <usual/base.h>
+
+#ifdef HAVE_MALLOC_H
+#include <malloc.h>
+#endif
+
+#ifndef HAVE_POSIX_MEMALIGN
+int posix_memalign(void **ptr_p, size_t align, size_t len)
+{
+	void *p;
+	int ret, old_errno = errno;
+
+#ifdef HAVE_MEMALIGN
+	p = memalign(align, len);
+#else /* !HAVE_MEMALIGN */
+#ifdef HAVE_VALLOC
+	/* assuming less than pagesize alignment */
+	p = valloc(len);
+#else /* !VALLOC */
+	#warning "cannot emulate posix_memalign sanely"
+	p = malloc(len);
+#endif /* !VALLOC */
+#endif /* !MEMALIGN */
+
+	*ptr_p = p;
+	if (p)
+		return 0;
+
+	/* on error restore old errno */
+	ret = errno;
+	errno = old_errno;
+	return ret;
+}
+#endif
+
diff --git a/usual/base.h b/usual/base.h
index 27bc542..590786e 100644
--- a/usual/base.h
+++ b/usual/base.h
@@ -126,6 +126,11 @@ static inline void *zmalloc(size_t len)
 	return calloc(1, len);
 }
 
+#ifndef HAVE_POSIX_MEMALIGN
+#define posix_memalign(a,b,c) usual_memalign(a,b,c)
+int posix_memalign(void **ptr_p, size_t align, size_t len);
+#endif
+
 /* cpp expr -> string */
 #define _STR_(identifier) #identifier
 #define STR(x) _STR_(x)
-- 
2.39.5