lib/tiny-printf.c: Add tiny printf function for space limited environments

This patch adds a small printf() version that supports all basic formats.
Its intented to be used in U-Boot SPL versions on platforms with very
limited internal RAM sizes.

To enable it, just define CONFIG_USE_TINY_PRINTF in your defconfig. This
will result in the SPL using this tiny function and the main U-Boot
still using the full-blown printf() function.

This code was copied from:
http://www.sparetimelabs.com/printfrevisited
With mostly only coding style related changes so that its checkpatch
clean.

The size reduction is about 2.5KiB. Here a comparison for the db-mv784mp-gp
(Marvell AXP) SPL:

Without this patch:
  58963   18536    1928   79427   13643 ./spl/u-boot-spl

With this patch:
  56542   18536    1956   77034   12cea ./spl/u-boot-spl

Note:
To make it possible to compile tiny-printf.c instead of vsprintf.c when
CONFIG_USE_TINY_PRINTF is defined, the functions printf() and vprintf() are
moved from common/console.c into vsprintf.c in this patch.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Tom Rini <trini@konsulko.com>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>

1 files changed, 0 insertions, 36 deletions

diff --git a/common/console.c b/common/console.c
index 75f84bdc95..bc37b6d962 100644
--- a/common/console.c
+++ b/common/console.c
@@ -558,42 +558,6 @@ void puts(const char *s)
 	}
 }
 
-int printf(const char *fmt, ...)
-{
-	va_list args;
-	uint i;
-	char printbuffer[CONFIG_SYS_PBSIZE];
-
-	va_start(args, fmt);
-
-	/*
-	 * For this to work, printbuffer must be larger than
-	 * anything we ever want to print.
-	 */
-	i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
-	va_end(args);
-
-	/* Print the string */
-	puts(printbuffer);
-	return i;
-}
-
-int vprintf(const char *fmt, va_list args)
-{
-	uint i;
-	char printbuffer[CONFIG_SYS_PBSIZE];
-
-	/*
-	 * For this to work, printbuffer must be larger than
-	 * anything we ever want to print.
-	 */
-	i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
-
-	/* Print the string */
-	puts(printbuffer);
-	return i;
-}
-
 #ifdef CONFIG_CONSOLE_RECORD
 int console_record_init(void)
 {