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https://github.com/Fishwaldo/u-boot.git
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7d9cde1031
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>
130 lines
1.9 KiB
C
130 lines
1.9 KiB
C
/*
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* Tiny printf version for SPL
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*
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* Copied from:
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* http://www.sparetimelabs.com/printfrevisited/printfrevisited.php
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*
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* Copyright (C) 2004,2008 Kustaa Nyholm
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*
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* SPDX-License-Identifier: LGPL-2.1+
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*/
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#include <common.h>
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#include <stdarg.h>
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#include <serial.h>
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static char *bf;
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static char buf[12];
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static unsigned int num;
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static char uc;
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static char zs;
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static void out(char c)
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{
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*bf++ = c;
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}
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static void out_dgt(char dgt)
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{
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out(dgt + (dgt < 10 ? '0' : (uc ? 'A' : 'a') - 10));
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zs = 1;
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}
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static void div_out(unsigned int div)
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{
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unsigned char dgt = 0;
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num &= 0xffff; /* just for testing the code with 32 bit ints */
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while (num >= div) {
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num -= div;
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dgt++;
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}
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if (zs || dgt > 0)
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out_dgt(dgt);
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}
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int printf(const char *fmt, ...)
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{
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va_list va;
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char ch;
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char *p;
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va_start(va, fmt);
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while ((ch = *(fmt++))) {
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if (ch != '%') {
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putc(ch);
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} else {
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char lz = 0;
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char w = 0;
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ch = *(fmt++);
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if (ch == '0') {
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ch = *(fmt++);
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lz = 1;
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}
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if (ch >= '0' && ch <= '9') {
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w = 0;
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while (ch >= '0' && ch <= '9') {
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w = (((w << 2) + w) << 1) + ch - '0';
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ch = *fmt++;
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}
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}
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bf = buf;
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p = bf;
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zs = 0;
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switch (ch) {
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case 0:
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goto abort;
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case 'u':
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case 'd':
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num = va_arg(va, unsigned int);
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if (ch == 'd' && (int)num < 0) {
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num = -(int)num;
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out('-');
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}
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div_out(10000);
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div_out(1000);
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div_out(100);
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div_out(10);
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out_dgt(num);
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break;
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case 'x':
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case 'X':
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uc = ch == 'X';
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num = va_arg(va, unsigned int);
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div_out(0x1000);
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div_out(0x100);
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div_out(0x10);
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out_dgt(num);
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break;
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case 'c':
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out((char)(va_arg(va, int)));
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break;
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case 's':
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p = va_arg(va, char*);
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break;
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case '%':
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out('%');
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default:
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break;
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}
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*bf = 0;
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bf = p;
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while (*bf++ && w > 0)
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w--;
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while (w-- > 0)
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putc(lz ? '0' : ' ');
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while ((ch = *p++))
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putc(ch);
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}
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}
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abort:
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va_end(va);
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return 0;
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}
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