From 7d9cde1031040a4931d6e12da7d9767b7e1d85d4 Mon Sep 17 00:00:00 2001 From: Stefan Roese Date: Mon, 23 Nov 2015 07:00:22 +0100 Subject: 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 Cc: Simon Glass Cc: Hans de Goede Cc: Tom Rini Cc: Albert Aribaud --- lib/vsprintf.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) (limited to 'lib/vsprintf.c') diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 4c82837cc4..dd8380b418 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -861,6 +861,42 @@ int sprintf(char *buf, const char *fmt, ...) return i; } +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; +} + static void panic_finish(void) __attribute__ ((noreturn)); static void panic_finish(void) -- cgit