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