[coreboot] [commit] r6415 - in trunk/payloads/libpayload: include libc

[repository service]

Author: oxygene
Date: Tue Mar  1 08:23:49 2011
New Revision: 6415
URL: https://tracker.coreboot.org/trac/coreboot/changeset/6415

Log:
libpayload: Implement ffs()

Signed-off-by: Patrick Georgi <patrick.georgi at secunet.com>
Acked-by: Stefan Reinauer <stefan.reinauer at coreboot.org>

Added:
   trunk/payloads/libpayload/include/strings.h
   trunk/payloads/libpayload/libc/strings.c
Modified:
   trunk/payloads/libpayload/libc/Makefile.inc

Added: trunk/payloads/libpayload/include/strings.h
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ trunk/payloads/libpayload/include/strings.h	Tue Mar  1 08:23:49 2011	(r6415)
@@ -0,0 +1,35 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2011 secunet Security Networks AG
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _STRINGS_H
+#define _STRINGS_H
+
+int ffs(int i);
+
+#endif

Modified: trunk/payloads/libpayload/libc/Makefile.inc
==============================================================================
--- trunk/payloads/libpayload/libc/Makefile.inc	Tue Mar  1 08:13:10 2011	(r6414)
+++ trunk/payloads/libpayload/libc/Makefile.inc	Tue Mar  1 08:23:49 2011	(r6415)
@@ -32,7 +32,7 @@
 TARGETS-$(CONFIG_LIBC) += libc/memory.o libc/ctype.o libc/ipchecksum.o libc/lib.o
 TARGETS-$(CONFIG_LIBC) += libc/rand.o libc/time.o libc/exec.o
 TARGETS-$(CONFIG_LIBC) += libc/readline.o libc/getopt_long.o libc/sysinfo.o
-TARGETS-$(CONFIG_LIBC) += libc/args.o
+TARGETS-$(CONFIG_LIBC) += libc/args.o libc/strings.o
 
 # should be moved to coreboot directory
 TARGETS-$(CONFIG_LAR) += libc/lar.o

Added: trunk/payloads/libpayload/libc/strings.c
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ trunk/payloads/libpayload/libc/strings.c	Tue Mar  1 08:23:49 2011	(r6415)
@@ -0,0 +1,40 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2011 secunet Security Networks AG
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+int ffs(int i)
+{
+	int count = 1;
+	if (i == 0) return 0;
+
+	while ((i & 1) != 1) {
+		i>>=1;
+		count++;
+	}
+	return count;
+}