WebSVN – HelenOS – Blame – /trunk/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	{
		86	int val = num;
1779	jermar	87	char d[sizeof(unative_t) * 8 + 1]; /* this is good enough even for base == 2 */
		88	int i = sizeof(unative_t) * 8 - 1;
1018	decky	89
		90	do {
		91	d[i--] = digits[val % base];
		92	} while (val /= base);
		93
1779	jermar	94	d[sizeof(unative_t) * 8] = 0;
1018	decky	95	puts(&d[i + 1]);
		96	}
		97
		98
		99	/** General formatted text print
		100	*
		101	* Print text formatted according the fmt parameter
		102	* and variant arguments. Each formatting directive
		103	* begins with \% (percentage) character and one of the
		104	* following character:
		105	*
		106	* \% Prints the percentage character.
		107	*
		108	* s The next variant argument is treated as char*
		109	* and printed as a NULL terminated string.
		110	*
		111	* c The next variant argument is treated as a single char.
		112	*
		113	* p The next variant argument is treated as a maximum
		114	* bit-width integer with respect to architecture
		115	* and printed in full hexadecimal width.
		116	*
		117	* P As with 'p', but '0x' is prefixed.
		118	*
		119	* q The next variant argument is treated as a 64b integer
		120	* and printed in full hexadecimal width.
		121	*
		122	* Q As with 'q', but '0x' is prefixed.
		123	*
		124	* l The next variant argument is treated as a 32b integer
		125	* and printed in full hexadecimal width.
		126	*
		127	* L As with 'l', but '0x' is prefixed.
		128	*
		129	* w The next variant argument is treated as a 16b integer
		130	* and printed in full hexadecimal width.
		131	*
		132	* W As with 'w', but '0x' is prefixed.
		133	*
		134	* b The next variant argument is treated as a 8b integer
		135	* and printed in full hexadecimal width.
		136	*
		137	* B As with 'b', but '0x' is prefixed.
		138	*
		139	* d The next variant argument is treated as integer
		140	* and printed in standard decimal format (only significant
		141	* digits).
		142	*
		143	* x The next variant argument is treated as integer
		144	* and printed in standard hexadecimal format (only significant
		145	* digits).
		146	*
		147	* X As with 'x', but '0x' is prefixed.
		148	*
		149	* All other characters from fmt except the formatting directives
		150	* are printed in verbatim.
		151	*
		152	* @param fmt Formatting NULL terminated string.
		153	*/
		154	void printf(const char *fmt, ...)
		155	{
		156	int i = 0;
		157	va_list ap;
		158	char c;
		159
		160	va_start(ap, fmt);
		161
		162	while ((c = fmt[i++])) {
		163	switch (c) {
		164
		165	/* control character */
		166	case '%':
		167
		168	switch (c = fmt[i++]) {
		169
		170	/* percentile itself */
		171	case '%':
		172	break;
		173
		174	/*
		175	* String and character conversions.
		176	*/
		177	case 's':
		178	puts(va_arg(ap, char_ptr));
		179	goto loop;
		180
		181	case 'c':
		182	c = (char) va_arg(ap, int);
		183	break;
		184
		185	/*
		186	* Hexadecimal conversions with fixed width.
		187	*/
		188	case 'P':
		189	puts("0x");
		190	case 'p':
1779	jermar	191	print_fixed_hex(va_arg(ap, unative_t), sizeof(unative_t));
1018	decky	192	goto loop;
		193
		194	case 'Q':
		195	puts("0x");
		196	case 'q':
1779	jermar	197	print_fixed_hex(va_arg(ap, uint64_t), INT64);
1018	decky	198	goto loop;
		199
		200	case 'L':
		201	puts("0x");
		202	case 'l':
1779	jermar	203	print_fixed_hex(va_arg(ap, unative_t), INT32);
1018	decky	204	goto loop;
		205
		206	case 'W':
		207	puts("0x");
		208	case 'w':
1779	jermar	209	print_fixed_hex(va_arg(ap, unative_t), INT16);
1018	decky	210	goto loop;
		211
		212	case 'B':
		213	puts("0x");
		214	case 'b':
1779	jermar	215	print_fixed_hex(va_arg(ap, unative_t), INT8);
1018	decky	216	goto loop;
		217
		218	/*
		219	* Decimal and hexadecimal conversions.
		220	*/
		221	case 'd':
1779	jermar	222	print_number(va_arg(ap, unative_t), 10);
1018	decky	223	goto loop;
		224
		225	case 'X':
		226	puts("0x");
		227	case 'x':
1779	jermar	228	print_number(va_arg(ap, unative_t), 16);
1018	decky	229	goto loop;
		230
		231	/*
		232	* Bad formatting.
		233	*/
		234	default:
		235	goto out;
		236	}
		237
		238	default:
		239	write(&c, 1);
		240	}
		241
		242	loop:
		243	;
		244	}
		245
		246	out:
		247
		248	va_end(ap);
		249	}
2465	jermar	250
		251	/** @}
		252	*/

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(root)/trunk/boot/generic/printf.c – Rev 2465