| /* |
| * Copyright (c) 2013 Kevin Wolf <kwolf@redhat.com> |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to deal |
| * in the Software without restriction, including without limitation the rights |
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| * copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| * THE SOFTWARE. |
| */ |
| |
| #include "libc.h" |
| |
| static void print_char(char c) |
| { |
| outb(0xe9, c); |
| } |
| |
| static void print_str(char *s) |
| { |
| while (*s) { |
| print_char(*s++); |
| } |
| } |
| |
| static void print_num(uint64_t value, int base) |
| { |
| char digits[] = "0123456789abcdef"; |
| char buf[32] = { 0 }; |
| int i = sizeof(buf) - 2; |
| |
| do { |
| buf[i--] = digits[value % base]; |
| value /= base; |
| } while (value); |
| |
| print_str(&buf[i + 1]); |
| } |
| |
| void printf(const char *fmt, ...) |
| { |
| va_list ap; |
| uint64_t val; |
| char *str; |
| int base; |
| int has_long; |
| int alt_form; |
| |
| va_start(ap, fmt); |
| |
| for (; *fmt; fmt++) { |
| if (*fmt != '%') { |
| print_char(*fmt); |
| continue; |
| } |
| fmt++; |
| |
| if (*fmt == '#') { |
| fmt++; |
| alt_form = 1; |
| } else { |
| alt_form = 0; |
| } |
| |
| if (*fmt == 'l') { |
| fmt++; |
| if (*fmt == 'l') { |
| fmt++; |
| has_long = 2; |
| } else { |
| has_long = 1; |
| } |
| } else { |
| has_long = 0; |
| } |
| |
| switch (*fmt) { |
| case 'x': |
| case 'p': |
| base = 16; |
| goto convert_number; |
| case 'd': |
| case 'i': |
| case 'u': |
| base = 10; |
| goto convert_number; |
| case 'o': |
| base = 8; |
| goto convert_number; |
| |
| convert_number: |
| switch (has_long) { |
| case 0: |
| val = va_arg(ap, unsigned int); |
| break; |
| case 1: |
| val = va_arg(ap, unsigned long); |
| break; |
| case 2: |
| val = va_arg(ap, unsigned long long); |
| break; |
| } |
| |
| if (alt_form && base == 16) { |
| print_str("0x"); |
| } |
| |
| print_num(val, base); |
| break; |
| |
| case 's': |
| str = va_arg(ap, char*); |
| print_str(str); |
| break; |
| case '%': |
| print_char(*fmt); |
| break; |
| default: |
| print_char('%'); |
| print_char(*fmt); |
| break; |
| } |
| } |
| |
| va_end(ap); |
| } |
| |
| |