WebSVN – HelenOS – Blame – /trunk/boot/generic/printf.c

Rev	Author	Line No.	Line
1018	decky	1	/*
		2	* Copyright (C) 2006 Martin 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
		29	#include "printf.h"
1763	jermar	30	#include "stdarg.h"
		31	#include <types.h>
1018	decky	32
1763	jermar	33	typedef char *char_ptr;
		34
1018	decky	35	static char digits[] = "0123456789abcdef"; /*< Hexadecimal characters /
		36
		37	void puts(const char *str)
		38	{
		39	int len = 0;
		40
		41	while (str[len] != 0)
		42	len++;
		43
		44	write(str, len);
		45	}
		46
		47
		48	/** Print hexadecimal digits
		49	*
		50	* Print fixed count of hexadecimal digits from
		51	* the number num. The digits are printed in
		52	* natural left-to-right order starting with
		53	* the width-th digit.
		54	*
		55	* @param num Number containing digits.
		56	* @param width Count of digits to print.
		57	*
		58	*/
		59	static void print_fixed_hex(const __u64 num, const int width)
		60	{
		61	int i;
		62
		63	for (i = width * 8 - 4; i >= 0; i -= 4)
		64	write(digits + ((num >> i) & 0xf), 1);
		65	}
		66
		67
		68	/** Print number in given base
		69	*
		70	* Print significant digits of a number in given
		71	* base.
		72	*
		73	* @param num Number to print.
		74	* @param base Base to print the number in (should
		75	* be in range 2 .. 16).
		76	*
		77	*/
		78	static void print_number(const __native num, const unsigned int base)
		79	{
		80	int val = num;
		81	char d[sizeof(__native) * 8 + 1]; /* this is good enough even for base == 2 */
		82	int i = sizeof(__native) * 8 - 1;
		83
		84	do {
		85	d[i--] = digits[val % base];
		86	} while (val /= base);
		87
		88	d[sizeof(__native) * 8] = 0;
		89	puts(&d[i + 1]);
		90	}
		91
		92
		93	/** General formatted text print
		94	*
		95	* Print text formatted according the fmt parameter
		96	* and variant arguments. Each formatting directive
		97	* begins with \% (percentage) character and one of the
		98	* following character:
		99	*
		100	* \% Prints the percentage character.
		101	*
		102	* s The next variant argument is treated as char*
		103	* and printed as a NULL terminated string.
		104	*
		105	* c The next variant argument is treated as a single char.
		106	*
		107	* p The next variant argument is treated as a maximum
		108	* bit-width integer with respect to architecture
		109	* and printed in full hexadecimal width.
		110	*
		111	* P As with 'p', but '0x' is prefixed.
		112	*
		113	* q The next variant argument is treated as a 64b integer
		114	* and printed in full hexadecimal width.
		115	*
		116	* Q As with 'q', but '0x' is prefixed.
		117	*
		118	* l The next variant argument is treated as a 32b integer
		119	* and printed in full hexadecimal width.
		120	*
		121	* L As with 'l', but '0x' is prefixed.
		122	*
		123	* w The next variant argument is treated as a 16b integer
		124	* and printed in full hexadecimal width.
		125	*
		126	* W As with 'w', but '0x' is prefixed.
		127	*
		128	* b The next variant argument is treated as a 8b integer
		129	* and printed in full hexadecimal width.
		130	*
		131	* B As with 'b', but '0x' is prefixed.
		132	*
		133	* d The next variant argument is treated as integer
		134	* and printed in standard decimal format (only significant
		135	* digits).
		136	*
		137	* x The next variant argument is treated as integer
		138	* and printed in standard hexadecimal format (only significant
		139	* digits).
		140	*
		141	* X As with 'x', but '0x' is prefixed.
		142	*
		143	* All other characters from fmt except the formatting directives
		144	* are printed in verbatim.
		145	*
		146	* @param fmt Formatting NULL terminated string.
		147	*/
		148	void printf(const char *fmt, ...)
		149	{
		150	int i = 0;
		151	va_list ap;
		152	char c;
		153
		154	va_start(ap, fmt);
		155
		156	while ((c = fmt[i++])) {
		157	switch (c) {
		158
		159	/* control character */
		160	case '%':
		161
		162	switch (c = fmt[i++]) {
		163
		164	/* percentile itself */
		165	case '%':
		166	break;
		167
		168	/*
		169	* String and character conversions.
		170	*/
		171	case 's':
		172	puts(va_arg(ap, char_ptr));
		173	goto loop;
		174
		175	case 'c':
		176	c = (char) va_arg(ap, int);
		177	break;
		178
		179	/*
		180	* Hexadecimal conversions with fixed width.
		181	*/
		182	case 'P':
		183	puts("0x");
		184	case 'p':
		185	print_fixed_hex(va_arg(ap, __native), sizeof(__native));
		186	goto loop;
		187
		188	case 'Q':
		189	puts("0x");
		190	case 'q':
		191	print_fixed_hex(va_arg(ap, __u64), INT64);
		192	goto loop;
		193
		194	case 'L':
		195	puts("0x");
		196	case 'l':
		197	print_fixed_hex(va_arg(ap, __native), INT32);
		198	goto loop;
		199
		200	case 'W':
		201	puts("0x");
		202	case 'w':
		203	print_fixed_hex(va_arg(ap, __native), INT16);
		204	goto loop;
		205
		206	case 'B':
		207	puts("0x");
		208	case 'b':
		209	print_fixed_hex(va_arg(ap, __native), INT8);
		210	goto loop;
		211
		212	/*
		213	* Decimal and hexadecimal conversions.
		214	*/
		215	case 'd':
		216	print_number(va_arg(ap, __native), 10);
		217	goto loop;
		218
		219	case 'X':
		220	puts("0x");
		221	case 'x':
		222	print_number(va_arg(ap, __native), 16);
		223	goto loop;
		224
		225	/*
		226	* Bad formatting.
		227	*/
		228	default:
		229	goto out;
		230	}
		231
		232	default:
		233	write(&c, 1);
		234	}
		235
		236	loop:
		237	;
		238	}
		239
		240	out:
		241
		242	va_end(ap);
		243	}

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(root)/trunk/boot/generic/printf.c @ 4308 – Rev 1763