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|
/*-------------------------------------------------------------------------+
| printk.c v1.1 - PC386 BSP - 1997/08/07
+--------------------------------------------------------------------------+
| (C) Copyright 1997 -
| - NavIST Group - Real-Time Distributed Systems and Industrial Automation
|
| http://pandora.ist.utl.pt
|
| Instituto Superior Tecnico * Lisboa * PORTUGAL
+--------------------------------------------------------------------------+
| Disclaimer:
|
| This file is provided "AS IS" without warranty of any kind, either
| expressed or implied.
+--------------------------------------------------------------------------+
| This code is based on code by: Jose Rufino - IST
|
| $Id$
+--------------------------------------------------------------------------*/
#include <stdarg.h>
#include <bspIo.h>
/*-------------------------------------------------------------------------+
| Function: printNum
| Description: print number in a given base.
| Global Variables: None.
| Arguments: num - number to print, base - base used to print the number.
| Returns: Nothing.
+--------------------------------------------------------------------------*/
static void
printNum(long int num, int base)
{
long int n;
if ((n = num / base) > 0)
printNum(n, base);
BSP_output_char("0123456789ABCDEF"[(int)(num % base)]);
} /* printNum */
/*-------------------------------------------------------------------------+
| Function: printk
| Description: a simplified version of printf intended for use when the
console is not yet initialized or in ISR's.
| Global Variables: None.
| Arguments: as in printf: fmt - format string, ... - unnamed arguments.
| Returns: Nothing.
+--------------------------------------------------------------------------*/
void
printk(char *fmt, ...)
{
va_list ap; /* points to each unnamed argument in turn */
char c, *str;
int lflag, base;
va_start(ap, fmt); /* make ap point to 1st unnamed arg */
for (; *fmt != '\0'; fmt++)
{
lflag = 0;
base = 0;
if (*fmt == '%')
{
if ((c = *++fmt) == 'l')
{
lflag = 1;
c = *++fmt;
}
switch (c)
{
case 'o': case 'O': base = 8; break;
case 'd': case 'D': base = 10; break;
case 'x': case 'X': base = 16; break;
case 's':
for (str = va_arg(ap, char *); *str; str++)
BSP_output_char(*str);
break;
case 'c':
BSP_output_char(va_arg(ap, char));
break;
default:
BSP_output_char(c);
break;
} /* switch*/
if (base)
printNum(lflag ? va_arg(ap, long int) : (long int)va_arg(ap, int),
base);
}
else
{
BSP_output_char(*fmt);
}
}
va_end(ap); /* clean up when done */
} /* printk */
|
