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/*
* (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
*
* $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdarg.h>
#include <stdio.h>
#include <stdbool.h>
#include <rtems/bspIo.h>
static void printNum(
long num,
unsigned base,
bool sign,
unsigned maxwidth,
char lead
);
/*
* vprintk
*
* A simplified version of printf intended for use when the
* console is not yet initialized or in ISR's.
*
* Arguments:
* as in printf: fmt - format string, ... - unnamed arguments.
*/
void vprintk(
const char *fmt,
va_list ap
)
{
for (; *fmt != '\0'; fmt++) {
unsigned base = 0;
unsigned width = 0;
bool lflag = false;
bool minus = false;
bool sign = false;
char lead = ' ';
char c;
if (*fmt != '%') {
BSP_output_char(*fmt);
continue;
}
fmt++;
if (*fmt == '0' ) {
lead = '0';
fmt++;
}
if (*fmt == '-' ) {
minus = true;
fmt++;
}
while (*fmt >= '0' && *fmt <= '9' ) {
width *= 10;
width += ((unsigned) *fmt - '0');
fmt++;
}
if ((c = *fmt) == 'l') {
lflag = true;
c = *++fmt;
}
if ( c == 'c' ) {
/* need a cast here since va_arg() only takes fully promoted types */
char chr = (char) va_arg(ap, int);
BSP_output_char(chr);
continue;
}
if ( c == 's' ) {
unsigned i, len;
char *s, *str;
str = va_arg(ap, char *);
if ( str == NULL ) {
str = "";
}
/* calculate length of string */
for ( len=0, s=str ; *s ; len++, s++ )
;
/* leading spaces */
if ( !minus )
for ( i=len ; i<width ; i++ )
BSP_output_char(' ');
/* no width option */
if (width == 0) {
width = len;
}
/* output the string */
for ( i=0 ; i<width && *str ; str++ )
BSP_output_char(*str);
/* trailing spaces */
if ( minus )
for ( i=len ; i<width ; i++ )
BSP_output_char(' ');
continue;
}
/* must be a numeric format or something unsupported */
if ( c == 'o' || c == 'O' ) {
base = 8; sign = false;
} else if ( c == 'i' || c == 'I' ||
c == 'd' || c == 'D' ) {
base = 10; sign = true;
} else if ( c == 'u' || c == 'U' ) {
base = 10; sign = false;
} else if ( c == 'x' || c == 'X' ) {
base = 16; sign = false;
} else if ( c == 'p' ) {
base = 16; sign = false; lflag = true;
} else {
BSP_output_char(c);
continue;
}
printNum(
lflag ? va_arg(ap, long) : (long) va_arg(ap, int),
base,
sign,
width,
lead
);
}
}
/*
* printNum - print number in a given base.
* Arguments
* num - number to print
* base - base used to print the number.
*/
static void printNum(
long num,
unsigned base,
bool sign,
unsigned maxwidth,
char lead
)
{
unsigned long unsigned_num;
unsigned long n;
unsigned count;
char toPrint[20];
if ( sign && (num < 0) ) {
BSP_output_char('-');
unsigned_num = (unsigned long) -num;
if (maxwidth) maxwidth--;
} else {
unsigned_num = (unsigned long) num;
}
count = 0;
while ((n = unsigned_num / base) > 0) {
toPrint[count++] = (char) (unsigned_num - (n * base));
unsigned_num = n;
}
toPrint[count++] = (char) unsigned_num;
for (n=maxwidth ; n > count; n-- )
BSP_output_char(lead);
for (n = 0; n < count; n++) {
BSP_output_char("0123456789ABCDEF"[(int)(toPrint[count-(n+1)])]);
}
}
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