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authorStefan Roese <sr@denx.de>2015-11-23 07:00:22 +0100
committerTom Rini <trini@konsulko.com>2015-11-23 10:56:07 -0500
commit7d9cde1031040a4931d6e12da7d9767b7e1d85d4 (patch)
tree902ccb2b9d0212a5f1b4a98eee1dd4b7b4f34d98 /lib/vsprintf.c
parentddf7355a73f2e01bd8eec4b939d8749ac22ff574 (diff)
downloadu-boot-7d9cde1031040a4931d6e12da7d9767b7e1d85d4.tar.gz
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 'lib/vsprintf.c')
-rw-r--r--lib/vsprintf.c36
1 files changed, 36 insertions, 0 deletions
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)