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/*
* Copyright (C) 2006 Martin Decky
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "printf.h"
#include "ofw.h"
static char digits
[] = "0123456789abcdef"; /**< Hexadecimal characters */
void puts(const char *str
)
{
long len
= 0;
while (str
[len
] != 0)
len
++;
ofw_write
(str
, len
);
}
/** Print hexadecimal digits
*
* Print fixed count of hexadecimal digits from
* the number num. The digits are printed in
* natural left-to-right order starting with
* the width-th digit.
*
* @param num Number containing digits.
* @param width Count of digits to print.
*
*/
static void print_fixed_hex
(const __u64 num
, const int width
)
{
int i
;
for (i
= width
* 8 - 4; i
>= 0; i
-= 4)
ofw_write
(digits
+ ((num
>> i
) & 0xf), 1);
}
/** Print number in given base
*
* Print significant digits of a number in given
* base.
*
* @param num Number to print.
* @param base Base to print the number in (should
* be in range 2 .. 16).
*
*/
static void print_number
(const __native num
, const unsigned int base
)
{
int val
= num
;
char d
[sizeof(__native
) * 8 + 1]; /* this is good enough even for base == 2 */
int i
= sizeof(__native
) * 8 - 1;
do {
d
[i
--] = digits
[val
% base
];
} while (val
/= base
);
d
[sizeof(__native
) * 8] = 0;
puts(&d
[i
+ 1]);
}
/** General formatted text print
*
* Print text formatted according the fmt parameter
* and variant arguments. Each formatting directive
* begins with \% (percentage) character and one of the
* following character:
*
* \% Prints the percentage character.
*
* s The next variant argument is treated as char*
* and printed as a NULL terminated string.
*
* c The next variant argument is treated as a single char.
*
* p The next variant argument is treated as a maximum
* bit-width integer with respect to architecture
* and printed in full hexadecimal width.
*
* P As with 'p', but '0x' is prefixed.
*
* q The next variant argument is treated as a 64b integer
* and printed in full hexadecimal width.
*
* Q As with 'q', but '0x' is prefixed.
*
* l The next variant argument is treated as a 32b integer
* and printed in full hexadecimal width.
*
* L As with 'l', but '0x' is prefixed.
*
* w The next variant argument is treated as a 16b integer
* and printed in full hexadecimal width.
*
* W As with 'w', but '0x' is prefixed.
*
* b The next variant argument is treated as a 8b integer
* and printed in full hexadecimal width.
*
* B As with 'b', but '0x' is prefixed.
*
* d The next variant argument is treated as integer
* and printed in standard decimal format (only significant
* digits).
*
* x The next variant argument is treated as integer
* and printed in standard hexadecimal format (only significant
* digits).
*
* X As with 'x', but '0x' is prefixed.
*
* All other characters from fmt except the formatting directives
* are printed in verbatim.
*
* @param fmt Formatting NULL terminated string.
*/
void printf(const char *fmt
, ...
)
{
long i
= 0;
va_list ap
;
char c
;
va_start(ap
, fmt
);
while ((c
= fmt
[i
++])) {
switch (c
) {
/* control character */
case '%':
switch (c
= fmt
[i
++]) {
/* percentile itself */
case '%':
break;
/*
* String and character conversions.
*/
case 's':
puts(va_arg(ap
, char_ptr
));
goto loop
;
case 'c':
c
= (char) va_arg(ap
, int);
break;
/*
* Hexadecimal conversions with fixed width.
*/
case 'P':
puts("0x");
case 'p':
print_fixed_hex
(va_arg(ap
, __native
), sizeof(__native
));
goto loop
;
case 'Q':
puts("0x");
case 'q':
print_fixed_hex
(va_arg(ap
, __u64
), INT64
);
goto loop
;
case 'L':
puts("0x");
case 'l':
print_fixed_hex
(va_arg(ap
, __native
), INT32
);
goto loop
;
case 'W':
puts("0x");
case 'w':
print_fixed_hex
(va_arg(ap
, __native
), INT16
);
goto loop
;
case 'B':
puts("0x");
case 'b':
print_fixed_hex
(va_arg(ap
, __native
), INT8
);
goto loop
;
/*
* Decimal and hexadecimal conversions.
*/
case 'd':
print_number
(va_arg(ap
, __native
), 10);
goto loop
;
case 'X':
puts("0x");
case 'x':
print_number
(va_arg(ap
, __native
), 16);
goto loop
;
/*
* Bad formatting.
*/
default:
goto out
;
}
default:
if (c
== '\n')
ofw_write
("\r", 1);
ofw_write
(&c
, 1);
}
loop
:
;
}
out
:
va_end(ap
);
}