WebSVN – HelenOS – Blame – /branches/dd/boot/generic/printf.c

Rev	Author	Line No.	Line
1018	decky	1	/*
2071	jermar	2	* Copyright (c) 2006 Martin Decky
1018	decky	3	* All rights reserved.
		4	*
		5	* Redistribution and use in source and binary forms, with or without
		6	* modification, are permitted provided that the following conditions
		7	* are met:
		8	*
		9	* - Redistributions of source code must retain the above copyright
		10	* notice, this list of conditions and the following disclaimer.
		11	* - Redistributions in binary form must reproduce the above copyright
		12	* notice, this list of conditions and the following disclaimer in the
		13	* documentation and/or other materials provided with the distribution.
		14	* - The name of the author may not be used to endorse or promote products
		15	* derived from this software without specific prior written permission.
		16	*
		17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
		18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
		19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
		20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
		21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
		22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
		26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		27	*/
		28
2465	jermar	29	/** @addtogroup generic
		30	* @{
		31	*/
		32	/** @file
		33	*/
		34
1018	decky	35	#include "printf.h"
1763	jermar	36	#include "stdarg.h"
		37	#include <types.h>
1018	decky	38
1763	jermar	39	typedef char *char_ptr;
		40
1018	decky	41	static char digits[] = "0123456789abcdef"; /*< Hexadecimal characters /
		42
		43	void puts(const char *str)
		44	{
		45	int len = 0;
		46
		47	while (str[len] != 0)
		48	len++;
		49
		50	write(str, len);
		51	}
		52
		53
		54	/** Print hexadecimal digits
		55	*
		56	* Print fixed count of hexadecimal digits from
		57	* the number num. The digits are printed in
		58	* natural left-to-right order starting with
		59	* the width-th digit.
		60	*
		61	* @param num Number containing digits.
		62	* @param width Count of digits to print.
		63	*
		64	*/
1779	jermar	65	static void print_fixed_hex(const uint64_t num, const int width)
1018	decky	66	{
		67	int i;
		68
		69	for (i = width * 8 - 4; i >= 0; i -= 4)
		70	write(digits + ((num >> i) & 0xf), 1);
		71	}
		72
		73
		74	/** Print number in given base
		75	*
		76	* Print significant digits of a number in given
		77	* base.
		78	*
		79	* @param num Number to print.
		80	* @param base Base to print the number in (should
		81	* be in range 2 .. 16).
		82	*
		83	*/
1779	jermar	84	static void print_number(const unative_t num, const unsigned int base)
1018	decky	85	{
4055	trochtova	86	int val = num;
		87
		88	/* This is enough even for base 2. */
		89	char d[sizeof(unative_t) * 8 + 1];
1779	jermar	90	int i = sizeof(unative_t) * 8 - 1;
4055	trochtova	91
1018	decky	92	do {
		93	d[i--] = digits[val % base];
		94	} while (val /= base);
4055	trochtova	95
1779	jermar	96	d[sizeof(unative_t) * 8] = 0;
1018	decky	97	puts(&d[i + 1]);
		98	}
		99
		100
		101	/** General formatted text print
		102	*
		103	* Print text formatted according the fmt parameter
		104	* and variant arguments. Each formatting directive
		105	* begins with \% (percentage) character and one of the
		106	* following character:
		107	*
		108	* \% Prints the percentage character.
		109	*
		110	* s The next variant argument is treated as char*
		111	* and printed as a NULL terminated string.
		112	*
		113	* c The next variant argument is treated as a single char.
		114	*
		115	* p The next variant argument is treated as a maximum
		116	* bit-width integer with respect to architecture
		117	* and printed in full hexadecimal width.
		118	*
		119	* P As with 'p', but '0x' is prefixed.
		120	*
		121	* q The next variant argument is treated as a 64b integer
		122	* and printed in full hexadecimal width.
		123	*
		124	* Q As with 'q', but '0x' is prefixed.
		125	*
		126	* l The next variant argument is treated as a 32b integer
		127	* and printed in full hexadecimal width.
		128	*
		129	* L As with 'l', but '0x' is prefixed.
		130	*
		131	* w The next variant argument is treated as a 16b integer
		132	* and printed in full hexadecimal width.
		133	*
		134	* W As with 'w', but '0x' is prefixed.
		135	*
		136	* b The next variant argument is treated as a 8b integer
		137	* and printed in full hexadecimal width.
		138	*
		139	* B As with 'b', but '0x' is prefixed.
		140	*
		141	* d The next variant argument is treated as integer
		142	* and printed in standard decimal format (only significant
		143	* digits).
		144	*
		145	* x The next variant argument is treated as integer
		146	* and printed in standard hexadecimal format (only significant
		147	* digits).
		148	*
		149	* X As with 'x', but '0x' is prefixed.
		150	*
		151	* All other characters from fmt except the formatting directives
		152	* are printed in verbatim.
		153	*
		154	* @param fmt Formatting NULL terminated string.
		155	*/
		156	void printf(const char *fmt, ...)
		157	{
		158	int i = 0;
		159	va_list ap;
		160	char c;
4055	trochtova	161
1018	decky	162	va_start(ap, fmt);
4055	trochtova	163
1018	decky	164	while ((c = fmt[i++])) {
		165	switch (c) {
4055	trochtova	166
		167	/* control character */
		168	case '%':
		169
		170	switch (c = fmt[i++]) {
		171
		172	/* percentile itself */
1018	decky	173	case '%':
4055	trochtova	174	break;
		175
		176	/*
		177	* String and character conversions.
		178	*/
		179	case 's':
		180	puts(va_arg(ap, char_ptr));
		181	goto loop;
		182
		183	case 'c':
		184	c = (char) va_arg(ap, int);
		185	break;
		186
		187	/*
		188	* Hexadecimal conversions with fixed width.
		189	*/
		190	case 'P':
		191	puts("0x");
		192	case 'p':
		193	print_fixed_hex(va_arg(ap, unative_t),
		194	sizeof(unative_t));
		195	goto loop;
		196
		197	case 'Q':
		198	puts("0x");
		199	case 'q':
		200	print_fixed_hex(va_arg(ap, uint64_t), INT64);
		201	goto loop;
		202
		203	case 'L':
		204	puts("0x");
		205	case 'l':
		206	print_fixed_hex(va_arg(ap, unative_t), INT32);
		207	goto loop;
		208
		209	case 'W':
		210	puts("0x");
		211	case 'w':
		212	print_fixed_hex(va_arg(ap, unative_t), INT16);
		213	goto loop;
		214
		215	case 'B':
		216	puts("0x");
		217	case 'b':
		218	print_fixed_hex(va_arg(ap, unative_t), INT8);
		219	goto loop;
		220
		221	/*
		222	* Decimal and hexadecimal conversions.
		223	*/
		224	case 'd':
		225	print_number(va_arg(ap, unative_t), 10);
		226	goto loop;
1018	decky	227
4055	trochtova	228	case 'X':
		229	puts("0x");
		230	case 'x':
		231	print_number(va_arg(ap, unative_t), 16);
		232	goto loop;
		233
		234	/*
		235	* Bad formatting.
		236	*/
		237	default:
		238	goto out;
1018	decky	239	}
4055	trochtova	240
		241	default:
		242	write(&c, 1);
1018	decky	243	}
		244	loop:
		245	;
		246	}
		247
		248	out:
		249
		250	va_end(ap);
		251	}
2465	jermar	252
		253	/** @}
		254	*/

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