140 lines
3.3 KiB
C
140 lines
3.3 KiB
C
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/*
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* Copyright (c) 2013 Kevin Wolf <kwolf@redhat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "libc.h"
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static void print_char(char c)
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{
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outb(0xe9, c);
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}
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static void print_str(char *s)
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{
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while (*s) {
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print_char(*s++);
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}
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}
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static void print_num(uint64_t value, int base)
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{
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char digits[] = "0123456789abcdef";
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char buf[32] = { 0 };
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int i = sizeof(buf) - 2;
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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 printf(const char *fmt, ...)
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{
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va_list ap;
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uint64_t val;
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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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va_start(ap, fmt);
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for (; *fmt; fmt++) {
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if (*fmt != '%') {
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print_char(*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 '%':
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print_char(*fmt);
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break;
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default:
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print_char('%');
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print_char(*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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