diff options
author | Stefan Roese <sr@denx.de> | 2015-11-23 07:00:22 +0100 |
---|---|---|
committer | Tom Rini <trini@konsulko.com> | 2015-11-23 10:56:07 -0500 |
commit | 7d9cde1031040a4931d6e12da7d9767b7e1d85d4 (patch) | |
tree | 902ccb2b9d0212a5f1b4a98eee1dd4b7b4f34d98 /examples/api | |
parent | ddf7355a73f2e01bd8eec4b939d8749ac22ff574 (diff) |
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>
Diffstat (limited to 'examples/api')
-rw-r--r-- | examples/api/libgenwrap.c | 40 |
1 files changed, 4 insertions, 36 deletions
diff --git a/examples/api/libgenwrap.c b/examples/api/libgenwrap.c index c1afa5bc09..ba51007b14 100644 --- a/examples/api/libgenwrap.c +++ b/examples/api/libgenwrap.c @@ -16,46 +16,14 @@ #include "glue.h" -/* - * printf() and vprintf() are stolen from u-boot/common/console.c - */ -int printf (const char *fmt, ...) -{ - va_list args; - uint i; - char printbuffer[256]; - - va_start (args, fmt); - - /* For this to work, printbuffer must be larger than - * anything we ever want to print. - */ - i = vsprintf (printbuffer, fmt, args); - va_end (args); - - /* Print the string */ - ub_puts (printbuffer); - return i; -} - -int vprintf (const char *fmt, va_list args) +void putc(const char c) { - uint i; - char printbuffer[256]; - - /* For this to work, printbuffer must be larger than - * anything we ever want to print. - */ - i = vsprintf (printbuffer, fmt, args); - - /* Print the string */ - ub_puts (printbuffer); - return i; + ub_putc(c); } -void putc (const char c) +void puts(const char *s) { - ub_putc(c); + ub_puts(s); } void __udelay(unsigned long usec) |