936647d3fc
Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
137 lines
2.9 KiB
C
137 lines
2.9 KiB
C
/*
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* Copyright (C) 2015 Virtual Open Systems SAS
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* Author: Alexander Spyridakis <a.spyridakis@virtualopensystems.com>
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*
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* printf based on implementation by Kevin Wolf <kwolf@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* SPDX-License-Identifier: GPL-2.0-only
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*/
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#include "minilib.h"
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typedef __builtin_va_list va_list;
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#define va_start(ap, X) __builtin_va_start(ap, X)
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#define va_arg(ap, type) __builtin_va_arg(ap, type)
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#define va_end(ap) __builtin_va_end(ap)
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static void print_str(char *s)
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{
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while (*s) {
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__sys_outc(*s++);
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}
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}
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static void print_num(unsigned long long value, int base)
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{
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char digits[] = "0123456789abcdef";
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char buf[32];
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int i = sizeof(buf) - 2, j;
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/* Set the buffer to 0. See problem of before. */
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for (j = 0; j < 32; j++) {
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buf[j] = 0;
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}
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do {
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buf[i--] = digits[value % base];
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value /= base;
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} while (value);
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print_str(&buf[i + 1]);
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}
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void ml_printf(const char *fmt, ...)
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{
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va_list ap;
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char *str;
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int base;
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int has_long;
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int alt_form;
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unsigned long long val;
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va_start(ap, fmt);
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for (; *fmt; fmt++) {
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if (*fmt != '%') {
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__sys_outc(*fmt);
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continue;
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}
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fmt++;
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if (*fmt == '#') {
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fmt++;
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alt_form = 1;
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} else {
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alt_form = 0;
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}
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if (*fmt == 'l') {
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fmt++;
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if (*fmt == 'l') {
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fmt++;
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has_long = 2;
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} else {
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has_long = 1;
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}
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} else {
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has_long = 0;
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}
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switch (*fmt) {
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case 'x':
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case 'p':
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base = 16;
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goto convert_number;
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case 'd':
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case 'i':
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case 'u':
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base = 10;
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goto convert_number;
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case 'o':
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base = 8;
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goto convert_number;
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convert_number:
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switch (has_long) {
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case 0:
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val = va_arg(ap, unsigned int);
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break;
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case 1:
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val = va_arg(ap, unsigned long);
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break;
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case 2:
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val = va_arg(ap, unsigned long long);
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break;
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}
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if (alt_form && base == 16) {
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print_str("0x");
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}
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print_num(val, base);
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break;
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case 's':
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str = va_arg(ap, char*);
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print_str(str);
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break;
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case 'c':
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__sys_outc(va_arg(ap, int));
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break;
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case '%':
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__sys_outc(*fmt);
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break;
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default:
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__sys_outc('%');
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__sys_outc(*fmt);
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break;
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}
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}
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va_end(ap);
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}
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