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[U-Boot,1/4,V2] COMMON: Add __stringify() function

Message ID 1348758495-28286-1-git-send-email-marex@denx.de
State Accepted
Delegated to: Tom Rini
Headers show

Commit Message

Marek Vasut Sept. 27, 2012, 3:08 p.m. UTC 
Copied from Linux kernel:
commit 8f7c2c37319a81ef4c2bfdec67b1ccd5744d97e4
Date:   Wed Apr 8 16:58:57 2009 +0800

Pull in the __stringify() macro from Linux kernel. This macro is usually used to
convert numbers to strings at preprocessor level, yet it is not limited only to
that. This is useful as it allows higher usage of puts() in favour of printf().

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Wolfgang Denk <wd@denx.de>
---
 include/common.h          |    1 +
 include/linux/stringify.h |   12 ++++++++++++
 2 files changed, 13 insertions(+)
 create mode 100644 include/linux/stringify.h

V2: Adjust the commit message, yet I'm still out of creative ideas here.
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Patch

diff --git a/include/common.h b/include/common.h
index 55025c0..9937a57 100644
--- a/include/common.h
+++ b/include/common.h
@@ -39,6 +39,7 @@  typedef volatile unsigned char	vu_char;
 #include <linux/bitops.h>
 #include <linux/types.h>
 #include <linux/string.h>
+#include <linux/stringify.h>
 #include <asm/ptrace.h>
 #include <stdarg.h>
 #if defined(CONFIG_PCI) && (defined(CONFIG_4xx) && !defined(CONFIG_AP1000))
diff --git a/include/linux/stringify.h b/include/linux/stringify.h
new file mode 100644
index 0000000..841cec8
--- /dev/null
+++ b/include/linux/stringify.h
@@ -0,0 +1,12 @@ 
+#ifndef __LINUX_STRINGIFY_H
+#define __LINUX_STRINGIFY_H
+
+/* Indirect stringification.  Doing two levels allows the parameter to be a
+ * macro itself.  For example, compile with -DFOO=bar, __stringify(FOO)
+ * converts to "bar".
+ */
+
+#define __stringify_1(x...)	#x
+#define __stringify(x...)	__stringify_1(x)
+
+#endif	/* !__LINUX_STRINGIFY_H */