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/**
* @file
*
* @brief Print Formatted Output
* @ingroup libcsupport
*/
/*
* (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
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdarg.h>
#include <stdio.h>
#include <stdbool.h>
#include <rtems/bspIo.h>
static int printNum(
long long num,
unsigned base,
bool sign,
unsigned maxwidth,
char lead
);
/**
* 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.
*/
int vprintk(
const char *fmt,
va_list ap
)
{
int len_out = 0;
for (; *fmt != '\0'; fmt++) {
unsigned base = 0;
unsigned width = 0;
enum {
LFLAG_INT,
LFLAG_LONG,
LFLAG_LONG_LONG
} lflag = LFLAG_INT;
bool minus = false;
bool sign = false;
char lead = ' ';
char c = *fmt;
long long num;
if (c != '%') {
rtems_putc(c);
++len_out;
continue;
}
++fmt; c = *fmt;
if (c == '0') {
lead = '0';
++fmt; c = *fmt;
}
if (c == '-') {
minus = true;
++fmt; c = *fmt;
}
while (c >= '0' && c <= '9' ) {
width *= 10;
width += ((unsigned) c - '0');
++fmt; c = *fmt;
}
if (c == 'l') {
lflag = LFLAG_LONG;
++fmt; c = *fmt;
if (c == 'l') {
lflag = LFLAG_LONG_LONG;
++fmt; c = *fmt;
}
}
if ( c == 'c' ) {
/* need a cast here since va_arg() only takes fully promoted types */
char chr = (char) va_arg(ap, int);
rtems_putc(chr);
++len_out;
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++, len_out++ )
rtems_putc(' ');
/* no width option */
if (width == 0) {
width = len;
}
/* output the string */
for ( i=0 ; i<width && *str ; str++, len_out++ )
rtems_putc(*str);
/* trailing spaces */
if ( minus )
for ( i=len ; i<width ; i++, len_out++ )
rtems_putc(' ');
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 = LFLAG_LONG;
} else {
rtems_putc(c);
++len_out;
continue;
}
switch (lflag) {
case LFLAG_LONG:
num = sign ? (long long) va_arg(ap, long)
: (long long) va_arg(ap, unsigned long);
break;
case LFLAG_LONG_LONG:
num = va_arg(ap, long long);
break;
case LFLAG_INT:
default:
num = sign ? (long long) va_arg(ap, int)
: (long long) va_arg(ap, unsigned int);
break;
}
len_out += printNum(num, base, sign, width, lead);
}
return len_out;
}
/**
* @brief Print Number in a Given Base
* @param[in] num is the number to print
* @param[in] base is the base used to print the number
*/
static int printNum(
long long num,
unsigned base,
bool sign,
unsigned maxwidth,
char lead
)
{
unsigned long long unsigned_num;
unsigned long long n;
unsigned count;
#define UINT64_MAX_IN_OCTAL_FORMAT "1777777777777777777777"
char toPrint[sizeof(UINT64_MAX_IN_OCTAL_FORMAT)];
int len_out = 0;
if ( sign && (num < 0) ) {
rtems_putc('-');
++len_out;
unsigned_num = (unsigned long long) -num;
if (maxwidth) maxwidth--;
} else {
unsigned_num = (unsigned long 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--, len_out++ )
rtems_putc(lead);
for (n = 0; n < count; n++, len_out++) {
rtems_putc("0123456789ABCDEF"[(int)(toPrint[count-(n+1)])]);
}
return len_out;
}
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