WebSVN – HelenOS – Blame – /branches/dynload/kernel/generic/src/printf/printf_core.c

Rev	Author	Line No.	Line
1271	cejka	1	/*
2071	jermar	2	* Copyright (c) 2001-2004 Jakub Jermar
		3	* Copyright (c) 2006 Josef Cejka
4347	svoboda	4	* Copyright (c) 2009 Martin Decky
1271	cejka	5	* All rights reserved.
		6	*
		7	* Redistribution and use in source and binary forms, with or without
		8	* modification, are permitted provided that the following conditions
		9	* are met:
		10	*
		11	* - Redistributions of source code must retain the above copyright
		12	* notice, this list of conditions and the following disclaimer.
		13	* - Redistributions in binary form must reproduce the above copyright
		14	* notice, this list of conditions and the following disclaimer in the
		15	* documentation and/or other materials provided with the distribution.
		16	* - The name of the author may not be used to endorse or promote products
		17	* derived from this software without specific prior written permission.
		18	*
		19	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
		20	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
		21	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
		22	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
		23	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
		24	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		25	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		26	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		27	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
		28	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		29	*/
		30
4347	svoboda	31	/** @addtogroup generic
1702	cejka	32	* @{
		33	*/
1271	cejka	34	/**
1702	cejka	35	* @file
4347	svoboda	36	* @brief Printing functions.
1271	cejka	37	*/
		38
		39	#include <printf/printf_core.h>
		40	#include <print.h>
		41	#include <arch/arg.h>
2572	jermar	42	#include <macros.h>
4345	svoboda	43	#include <string.h>
1271	cejka	44	#include <arch.h>
		45
2572	jermar	46	/** show prefixes 0x or 0 */
4347	svoboda	47	#define __PRINTF_FLAG_PREFIX 0x00000001
2572	jermar	48	/** signed / unsigned number */
4347	svoboda	49	#define __PRINTF_FLAG_SIGNED 0x00000002
2572	jermar	50	/** print leading zeroes */
4347	svoboda	51	#define __PRINTF_FLAG_ZEROPADDED 0x00000004
2572	jermar	52	/** align to left */
4347	svoboda	53	#define __PRINTF_FLAG_LEFTALIGNED 0x00000010
2572	jermar	54	/** always show + sign */
4347	svoboda	55	#define __PRINTF_FLAG_SHOWPLUS 0x00000020
2572	jermar	56	/** print space instead of plus */
4347	svoboda	57	#define __PRINTF_FLAG_SPACESIGN 0x00000040
2572	jermar	58	/** show big characters */
4347	svoboda	59	#define __PRINTF_FLAG_BIGCHARS 0x00000080
2572	jermar	60	/** number has - sign */
4347	svoboda	61	#define __PRINTF_FLAG_NEGATIVE 0x00000100
1271	cejka	62
2572	jermar	63	/**
		64	* Buffer big enough for 64-bit number printed in base 2, sign, prefix and 0
		65	* to terminate string... (last one is only for better testing end of buffer by
		66	* zero-filling subroutine)
		67	*/
4347	svoboda	68	#define PRINT_NUMBER_BUFFER_SIZE (64 + 5)
1271	cejka	69
		70	/** Enumeration of possible arguments types.
		71	*/
		72	typedef enum {
		73	PrintfQualifierByte = 0,
		74	PrintfQualifierShort,
		75	PrintfQualifierInt,
		76	PrintfQualifierLong,
		77	PrintfQualifierLongLong,
		78	PrintfQualifierPointer
		79	} qualifier_t;
		80
4347	svoboda	81	static char nullstr[] = "(NULL)";
2572	jermar	82	static char digits_small[] = "0123456789abcdef";
		83	static char digits_big[] = "0123456789ABCDEF";
4348	svoboda	84	static char invalch = U_SPECIAL;
1271	cejka	85
4348	svoboda	86	/** Print one or more characters without adding newline.
2572	jermar	87	*
4348	svoboda	88	* @param buf Buffer holding characters with size of
4347	svoboda	89	* at least size bytes. NULL is not allowed!
		90	* @param size Size of the buffer in bytes.
		91	* @param ps Output method and its data.
		92	*
4348	svoboda	93	* @return Number of characters printed.
4347	svoboda	94	*
1271	cejka	95	*/
4348	svoboda	96	static int printf_putnchars(const char *buf, size_t size,
4347	svoboda	97	printf_spec_t *ps)
1271	cejka	98	{
4348	svoboda	99	return ps->str_write((void *) buf, size, ps->data);
1271	cejka	100	}
		101
4348	svoboda	102	/** Print one or more wide characters without adding newline.
2572	jermar	103	*
4348	svoboda	104	* @param buf Buffer holding wide characters with size of
4347	svoboda	105	* at least size bytes. NULL is not allowed!
		106	* @param size Size of the buffer in bytes.
		107	* @param ps Output method and its data.
		108	*
4348	svoboda	109	* @return Number of wide characters printed.
4347	svoboda	110	*
1271	cejka	111	*/
4348	svoboda	112	static int printf_wputnchars(const wchar_t *buf, size_t size,
4347	svoboda	113	printf_spec_t *ps)
1271	cejka	114	{
4348	svoboda	115	return ps->wstr_write((void *) buf, size, ps->data);
4347	svoboda	116	}
		117
4348	svoboda	118	/** Print string without adding a newline.
4347	svoboda	119	*
4348	svoboda	120	* @param str String to print.
4347	svoboda	121	* @param ps Write function specification and support data.
		122	*
4348	svoboda	123	* @return Number of characters printed.
4347	svoboda	124	*
		125	*/
		126	static int printf_putstr(const char str, printf_spec_t ps)
		127	{
		128	if (str == NULL)
4348	svoboda	129	return printf_putnchars(nullstr, str_size(nullstr), ps);
1271	cejka	130
4348	svoboda	131	return ps->str_write((void *) str, str_size(str), ps->data);
4347	svoboda	132	}
1271	cejka	133
4347	svoboda	134	/** Print one ASCII character.
		135	*
		136	* @param c ASCII character to be printed.
		137	* @param ps Output method.
		138	*
		139	* @return Number of characters printed.
		140	*
		141	*/
		142	static int printf_putchar(const char ch, printf_spec_t *ps)
		143	{
		144	if (!ascii_check(ch))
4348	svoboda	145	return ps->str_write((void *) &invalch, 1, ps->data);
4347	svoboda	146
4348	svoboda	147	return ps->str_write(&ch, 1, ps->data);
1271	cejka	148	}
		149
4348	svoboda	150	/** Print one wide character.
2572	jermar	151	*
4348	svoboda	152	* @param c Wide character to be printed.
4347	svoboda	153	* @param ps Output method.
2572	jermar	154	*
4347	svoboda	155	* @return Number of characters printed.
		156	*
1271	cejka	157	*/
4347	svoboda	158	static int printf_putwchar(const wchar_t ch, printf_spec_t *ps)
1271	cejka	159	{
4348	svoboda	160	if (!chr_check(ch))
		161	return ps->str_write((void *) &invalch, 1, ps->data);
1271	cejka	162
4348	svoboda	163	return ps->wstr_write(&ch, sizeof(wchar_t), ps->data);
1271	cejka	164	}
		165
4347	svoboda	166	/** Print one formatted ASCII character.
2572	jermar	167	*
4347	svoboda	168	* @param ch Character to print.
		169	* @param width Width modifier.
		170	* @param flags Flags that change the way the character is printed.
2572	jermar	171	*
4347	svoboda	172	* @return Number of characters printed, negative value on failure.
		173	*
1271	cejka	174	*/
4347	svoboda	175	static int print_char(const char ch, int width, uint32_t flags, printf_spec_t *ps)
1271	cejka	176	{
4347	svoboda	177	count_t counter = 0;
1271	cejka	178	if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
2572	jermar	179	while (--width > 0) {
		180	/*
		181	* One space is consumed by the character itself, hence
		182	* the predecrement.
		183	*/
4347	svoboda	184	if (printf_putchar(' ', ps) > 0)
		185	counter++;
1271	cejka	186	}
		187	}
		188
4347	svoboda	189	if (printf_putchar(ch, ps) > 0)
1604	cejka	190	counter++;
4347	svoboda	191
		192	while (--width > 0) {
		193	/*
		194	* One space is consumed by the character itself, hence
		195	* the predecrement.
		196	*/
		197	if (printf_putchar(' ', ps) > 0)
		198	counter++;
		199	}
		200
		201	return (int) (counter + 1);
		202	}
1271	cejka	203
4348	svoboda	204	/** Print one formatted wide character.
4347	svoboda	205	*
		206	* @param ch Character to print.
		207	* @param width Width modifier.
		208	* @param flags Flags that change the way the character is printed.
		209	*
		210	* @return Number of characters printed, negative value on failure.
		211	*
		212	*/
		213	static int print_wchar(const wchar_t ch, int width, uint32_t flags, printf_spec_t *ps)
		214	{
		215	count_t counter = 0;
		216	if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
		217	while (--width > 0) {
2572	jermar	218	/*
		219	* One space is consumed by the character itself, hence
		220	* the predecrement.
		221	*/
4347	svoboda	222	if (printf_putchar(' ', ps) > 0)
		223	counter++;
		224	}
		225	}
		226
		227	if (printf_putwchar(ch, ps) > 0)
		228	counter++;
		229
		230	while (--width > 0) {
		231	/*
		232	* One space is consumed by the character itself, hence
		233	* the predecrement.
		234	*/
1604	cejka	235	if (printf_putchar(' ', ps) > 0)
4347	svoboda	236	counter++;
1271	cejka	237	}
		238
4347	svoboda	239	return (int) (counter + 1);
1271	cejka	240	}
		241
4348	svoboda	242	/** Print string.
2572	jermar	243	*
4348	svoboda	244	* @param str String to be printed.
4347	svoboda	245	* @param width Width modifier.
		246	* @param precision Precision modifier.
		247	* @param flags Flags that modify the way the string is printed.
2572	jermar	248	*
4348	svoboda	249	* @return Number of characters printed, negative value on failure.
4347	svoboda	250	*/
4348	svoboda	251	static int print_str(char *str, int width, unsigned int precision,
		252	uint32_t flags, printf_spec_t *ps)
1271	cejka	253	{
4347	svoboda	254	if (str == NULL)
		255	return printf_putstr(nullstr, ps);
4348	svoboda	256
		257	/* Print leading spaces. */
		258	count_t strw = str_length(str);
4347	svoboda	259	if (precision == 0)
4348	svoboda	260	precision = strw;
		261
		262	/* Left padding */
4347	svoboda	263	count_t counter = 0;
		264	width -= precision;
		265	if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
		266	while (width-- > 0) {
		267	if (printf_putchar(' ', ps) == 1)
		268	counter++;
		269	}
		270	}
4348	svoboda	271
		272	/* Part of @a str fitting into the alloted space. */
1604	cejka	273	int retval;
4348	svoboda	274	size_t size = str_lsize(str, precision);
		275	if ((retval = printf_putnchars(str, size, ps)) < 0)
4347	svoboda	276	return -counter;
4348	svoboda	277
4347	svoboda	278	counter += retval;
4348	svoboda	279
		280	/* Right padding */
4347	svoboda	281	while (width-- > 0) {
		282	if (printf_putchar(' ', ps) == 1)
		283	counter++;
1271	cejka	284	}
4348	svoboda	285
4347	svoboda	286	return ((int) counter);
4348	svoboda	287
4347	svoboda	288	}
1271	cejka	289
4348	svoboda	290	/** Print wide string.
4347	svoboda	291	*
4348	svoboda	292	* @param str Wide string to be printed.
4347	svoboda	293	* @param width Width modifier.
		294	* @param precision Precision modifier.
		295	* @param flags Flags that modify the way the string is printed.
		296	*
4348	svoboda	297	* @return Number of wide characters printed, negative value on failure.
4347	svoboda	298	*/
4348	svoboda	299	static int print_wstr(wchar_t *str, int width, unsigned int precision,
		300	uint32_t flags, printf_spec_t *ps)
4347	svoboda	301	{
		302	if (str == NULL)
		303	return printf_putstr(nullstr, ps);
		304
4348	svoboda	305	if (*str == U_BOM)
		306	str++;
		307
		308	/* Print leading spaces. */
		309	size_t strw = wstr_length(str);
4347	svoboda	310	if (precision == 0)
4348	svoboda	311	precision = strw;
4347	svoboda	312
4348	svoboda	313	/* Left padding */
4347	svoboda	314	count_t counter = 0;
1271	cejka	315	width -= precision;
		316	if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
4347	svoboda	317	while (width-- > 0) {
		318	if (printf_putchar(' ', ps) == 1)
1604	cejka	319	counter++;
1271	cejka	320	}
		321	}
4347	svoboda	322
4348	svoboda	323	/* Part of @a wstr fitting into the alloted space. */
4347	svoboda	324	int retval;
4348	svoboda	325	size_t size = wstr_lsize(str, precision);
		326	if ((retval = printf_wputnchars(str, size, ps)) < 0)
1604	cejka	327	return -counter;
4347	svoboda	328
		329	counter += retval;
		330
4348	svoboda	331	/* Right padding */
1271	cejka	332	while (width-- > 0) {
4347	svoboda	333	if (printf_putchar(' ', ps) == 1)
		334	counter++;
1271	cejka	335	}
4348	svoboda	336
4347	svoboda	337	return ((int) counter);
1271	cejka	338	}
		339
2572	jermar	340	/** Print a number in a given base.
1271	cejka	341	*
2572	jermar	342	* Print significant digits of a number in given base.
1271	cejka	343	*
4347	svoboda	344	* @param num Number to print.
		345	* @param width Width modifier.
		346	* @param precision Precision modifier.
		347	* @param base Base to print the number in (must be between 2 and 16).
		348	* @param flags Flags that modify the way the number is printed.
1271	cejka	349	*
4347	svoboda	350	* @return Number of characters printed.
2572	jermar	351	*
1271	cejka	352	*/
2572	jermar	353	static int print_number(uint64_t num, int width, int precision, int base,
4347	svoboda	354	uint32_t flags, printf_spec_t *ps)
1271	cejka	355	{
4347	svoboda	356	char *digits;
		357	if (flags & __PRINTF_FLAG_BIGCHARS)
		358	digits = digits_big;
		359	else
		360	digits = digits_small;
1271	cejka	361
4347	svoboda	362	char data[PRINT_NUMBER_BUFFER_SIZE];
		363	char *ptr = &data[PRINT_NUMBER_BUFFER_SIZE - 1];
1271	cejka	364
4347	svoboda	365	/* Size of number with all prefixes and signs */
		366	int size = 0;
		367
		368	/* Put zero at end of string */
		369	*ptr-- = 0;
		370
1271	cejka	371	if (num == 0) {
		372	*ptr-- = '0';
		373	size++;
		374	} else {
		375	do {
		376	*ptr-- = digits[num % base];
		377	size++;
		378	} while (num /= base);
		379	}
		380
4347	svoboda	381	/* Size of plain number */
		382	int number_size = size;
		383
2572	jermar	384	/*
4347	svoboda	385	* Collect the sum of all prefixes/signs/etc. to calculate padding and
2572	jermar	386	* leading zeroes.
		387	*/
1271	cejka	388	if (flags & __PRINTF_FLAG_PREFIX) {
		389	switch(base) {
4347	svoboda	390	case 2:
		391	/* Binary formating is not standard, but usefull */
2070	jermar	392	size += 2;
		393	break;
		394	case 8:
		395	size++;
		396	break;
		397	case 16:
		398	size += 2;
		399	break;
1271	cejka	400	}
		401	}
4347	svoboda	402
		403	char sgn = 0;
1271	cejka	404	if (flags & __PRINTF_FLAG_SIGNED) {
		405	if (flags & __PRINTF_FLAG_NEGATIVE) {
		406	sgn = '-';
		407	size++;
		408	} else if (flags & __PRINTF_FLAG_SHOWPLUS) {
2572	jermar	409	sgn = '+';
		410	size++;
		411	} else if (flags & __PRINTF_FLAG_SPACESIGN) {
		412	sgn = ' ';
		413	size++;
		414	}
1271	cejka	415	}
4347	svoboda	416
		417	if (flags & __PRINTF_FLAG_LEFTALIGNED)
1271	cejka	418	flags &= ~__PRINTF_FLAG_ZEROPADDED;
4347	svoboda	419
2572	jermar	420	/*
4347	svoboda	421	* If the number is left-aligned or precision is specified then
		422	* padding with zeros is ignored.
2572	jermar	423	*/
1271	cejka	424	if (flags & __PRINTF_FLAG_ZEROPADDED) {
4347	svoboda	425	if ((precision == 0) && (width > size))
1271	cejka	426	precision = width - size + number_size;
		427	}
4347	svoboda	428
		429	/* Print leading spaces */
2572	jermar	430	if (number_size > precision) {
4347	svoboda	431	/* Print the whole number, not only a part */
1271	cejka	432	precision = number_size;
2572	jermar	433	}
4347	svoboda	434
1271	cejka	435	width -= precision + size - number_size;
4347	svoboda	436	count_t counter = 0;
1271	cejka	437
		438	if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
4347	svoboda	439	while (width-- > 0) {
		440	if (printf_putchar(' ', ps) == 1)
1604	cejka	441	counter++;
1271	cejka	442	}
		443	}
		444
4347	svoboda	445	/* Print sign */
1271	cejka	446	if (sgn) {
1604	cejka	447	if (printf_putchar(sgn, ps) == 1)
		448	counter++;
1271	cejka	449	}
		450
4347	svoboda	451	/* Print prefix */
1271	cejka	452	if (flags & __PRINTF_FLAG_PREFIX) {
		453	switch(base) {
4347	svoboda	454	case 2:
		455	/* Binary formating is not standard, but usefull */
2070	jermar	456	if (printf_putchar('0', ps) == 1)
		457	counter++;
		458	if (flags & __PRINTF_FLAG_BIGCHARS) {
		459	if (printf_putchar('B', ps) == 1)
1604	cejka	460	counter++;
2070	jermar	461	} else {
		462	if (printf_putchar('b', ps) == 1)
1604	cejka	463	counter++;
2070	jermar	464	}
		465	break;
		466	case 8:
		467	if (printf_putchar('o', ps) == 1)
		468	counter++;
		469	break;
		470	case 16:
		471	if (printf_putchar('0', ps) == 1)
		472	counter++;
		473	if (flags & __PRINTF_FLAG_BIGCHARS) {
		474	if (printf_putchar('X', ps) == 1)
1604	cejka	475	counter++;
2070	jermar	476	} else {
		477	if (printf_putchar('x', ps) == 1)
		478	counter++;
		479	}
		480	break;
1271	cejka	481	}
		482	}
4347	svoboda	483
		484	/* Print leading zeroes */
1271	cejka	485	precision -= number_size;
4347	svoboda	486	while (precision-- > 0) {
1604	cejka	487	if (printf_putchar('0', ps) == 1)
		488	counter++;
1271	cejka	489	}
		490
4347	svoboda	491	/* Print the number itself */
		492	int retval;
		493	if ((retval = printf_putstr(++ptr, ps)) > 0)
1604	cejka	494	counter += retval;
1271	cejka	495
4347	svoboda	496	/* Print tailing spaces */
1271	cejka	497
4347	svoboda	498	while (width-- > 0) {
		499	if (printf_putchar(' ', ps) == 1)
1604	cejka	500	counter++;
1271	cejka	501	}
4347	svoboda	502
		503	return ((int) counter);
1271	cejka	504	}
		505
		506	/** Print formatted string.
		507	*
2572	jermar	508	* Print string formatted according to the fmt parameter and variadic arguments.
		509	* Each formatting directive must have the following form:
1271	cejka	510	*
4347	svoboda	511	* \% [ FLAGS ] [ WIDTH ] [ .PRECISION ] [ TYPE ] CONVERSION
		512	*
1271	cejka	513	* FLAGS:@n
4347	svoboda	514	* - "#" Force to print prefix. For \%o conversion, the prefix is 0, for
		515	* \%x and \%X prefixes are 0x and 0X and for conversion \%b the
		516	* prefix is 0b.
1271	cejka	517	*
4347	svoboda	518	* - "-" Align to left.
1271	cejka	519	*
4347	svoboda	520	* - "+" Print positive sign just as negative.
1271	cejka	521	*
4347	svoboda	522	* - " " If the printed number is positive and "+" flag is not set,
		523	* print space in place of sign.
1271	cejka	524	*
4347	svoboda	525	* - "0" Print 0 as padding instead of spaces. Zeroes are placed between
		526	* sign and the rest of the number. This flag is ignored if "-"
		527	* flag is specified.
		528	*
1271	cejka	529	* WIDTH:@n
4347	svoboda	530	* - Specify the minimal width of a printed argument. If it is bigger,
		531	* width is ignored. If width is specified with a "*" character instead of
		532	* number, width is taken from parameter list. And integer parameter is
		533	* expected before parameter for processed conversion specification. If
		534	* this value is negative its absolute value is taken and the "-" flag is
		535	* set.
1271	cejka	536	*
		537	* PRECISION:@n
4347	svoboda	538	* - Value precision. For numbers it specifies minimum valid numbers.
		539	* Smaller numbers are printed with leading zeroes. Bigger numbers are not
		540	* affected. Strings with more than precision characters are cut off. Just
		541	* as with width, an "*" can be used used instead of a number. An integer
		542	* value is then expected in parameters. When both width and precision are
		543	* specified using "*", the first parameter is used for width and the
		544	* second one for precision.
		545	*
1271	cejka	546	* TYPE:@n
4347	svoboda	547	* - "hh" Signed or unsigned char.@n
		548	* - "h" Signed or unsigned short.@n
		549	* - "" Signed or unsigned int (default value).@n
		550	* - "l" Signed or unsigned long int.@n
4348	svoboda	551	* If conversion is "c", the character is wchar_t (wide character).@n
		552	* If conversion is "s", the string is wchar_t * (wide string).@n
4347	svoboda	553	* - "ll" Signed or unsigned long long int.@n
		554	*
1271	cejka	555	* CONVERSION:@n
4347	svoboda	556	* - % Print percentile character itself.
1271	cejka	557	*
4347	svoboda	558	* - c Print single character. The character is expected to be plain
		559	* ASCII (e.g. only values 0 .. 127 are valid).@n
4348	svoboda	560	* If type is "l", then the character is expected to be wide character
4347	svoboda	561	* (e.g. values 0 .. 0x10ffff are valid).
1271	cejka	562	*
4347	svoboda	563	* - s Print zero terminated string. If a NULL value is passed as
		564	* value, "(NULL)" is printed instead.@n
4348	svoboda	565	* If type is "l", then the string is expected to be wide string.
1271	cejka	566	*
4347	svoboda	567	* - P, p Print value of a pointer. Void * value is expected and it is
		568	* printed in hexadecimal notation with prefix (as with \%#X / \%#x
		569	* for 32-bit or \%#X / \%#x for 64-bit long pointers).
1271	cejka	570	*
4347	svoboda	571	* - b Print value as unsigned binary number. Prefix is not printed by
		572	* default. (Nonstandard extension.)
1271	cejka	573	*
4347	svoboda	574	* - o Print value as unsigned octal number. Prefix is not printed by
		575	* default.
1271	cejka	576	*
4347	svoboda	577	* - d, i Print signed decimal number. There is no difference between d
		578	* and i conversion.
		579	*
		580	* - u Print unsigned decimal number.
		581	*
		582	* - X, x Print hexadecimal number with upper- or lower-case. Prefix is
		583	* not printed by default.
		584	*
4348	svoboda	585	* All other characters from fmt except the formatting directives are printed
2572	jermar	586	* verbatim.
1271	cejka	587	*
4348	svoboda	588	* @param fmt Format NULL-terminated string.
4347	svoboda	589	*
4348	svoboda	590	* @return Number of characters printed, negative value on failure.
4347	svoboda	591	*
1271	cejka	592	*/
4347	svoboda	593	int printf_core(const char fmt, printf_spec_t ps, va_list ap)
1271	cejka	594	{
4348	svoboda	595	size_t i; /* Index of the currently processed character from fmt */
		596	size_t nxt = 0; /* Index of the next character from fmt */
		597	size_t j = 0; /* Index to the first not printed nonformating character */
1271	cejka	598
4348	svoboda	599	count_t counter = 0; /* Number of characters printed */
4347	svoboda	600	int retval; /* Return values from nested functions */
		601
4348	svoboda	602	while (true) {
		603	i = nxt;
		604	wchar_t uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
		605
		606	if (uc == 0)
		607	break;
		608
4347	svoboda	609	/* Control character */
		610	if (uc == '%') {
		611	/* Print common characters if any processed */
1271	cejka	612	if (i > j) {
4348	svoboda	613	if ((retval = printf_putnchars(&fmt[j], i - j, ps)) < 0) {
4347	svoboda	614	/* Error */
1271	cejka	615	counter = -counter;
		616	goto out;
		617	}
		618	counter += retval;
		619	}
4347	svoboda	620
1271	cejka	621	j = i;
		622
4347	svoboda	623	/* Parse modifiers */
		624	uint32_t flags = 0;
		625	bool end = false;
		626
1271	cejka	627	do {
4348	svoboda	628	i = nxt;
		629	uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
4347	svoboda	630	switch (uc) {
2572	jermar	631	case '#':
		632	flags \|= __PRINTF_FLAG_PREFIX;
		633	break;
		634	case '-':
		635	flags \|= __PRINTF_FLAG_LEFTALIGNED;
		636	break;
		637	case '+':
		638	flags \|= __PRINTF_FLAG_SHOWPLUS;
		639	break;
		640	case ' ':
		641	flags \|= __PRINTF_FLAG_SPACESIGN;
		642	break;
		643	case '0':
		644	flags \|= __PRINTF_FLAG_ZEROPADDED;
		645	break;
		646	default:
4347	svoboda	647	end = true;
		648	};
		649	} while (!end);
1271	cejka	650
4347	svoboda	651	/* Width & '' operator /
		652	int width = 0;
		653	if (isdigit(uc)) {
4348	svoboda	654	while (true) {
		655	width *= 10;
		656	width += uc - '0';
		657
		658	i = nxt;
		659	uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
		660	if (uc == 0)
		661	break;
4347	svoboda	662	if (!isdigit(uc))
		663	break;
1271	cejka	664	}
4347	svoboda	665	} else if (uc == '*') {
		666	/* Get width value from argument list */
4348	svoboda	667	i = nxt;
		668	uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
3149	svoboda	669	width = (int) va_arg(ap, int);
1271	cejka	670	if (width < 0) {
4347	svoboda	671	/* Negative width sets '-' flag */
1271	cejka	672	width *= -1;
		673	flags \|= __PRINTF_FLAG_LEFTALIGNED;
		674	}
		675	}
		676
4347	svoboda	677	/* Precision and '' operator /
		678	int precision = 0;
		679	if (uc == '.') {
4348	svoboda	680	i = nxt;
		681	uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
4347	svoboda	682	if (isdigit(uc)) {
4348	svoboda	683	while (true) {
		684	precision *= 10;
		685	precision += uc - '0';
		686
		687	i = nxt;
		688	uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
		689	if (uc == 0)
		690	break;
4347	svoboda	691	if (!isdigit(uc))
		692	break;
1271	cejka	693	}
4348	svoboda	694	} else if (uc == '*') {
4347	svoboda	695	/* Get precision value from the argument list */
4348	svoboda	696	i = nxt;
		697	uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
3149	svoboda	698	precision = (int) va_arg(ap, int);
1271	cejka	699	if (precision < 0) {
4347	svoboda	700	/* Ignore negative precision */
1271	cejka	701	precision = 0;
		702	}
		703	}
		704	}
4347	svoboda	705
		706	qualifier_t qualifier;
		707
		708	switch (uc) {
		709	/** @todo Unimplemented qualifiers:
		710	* t ptrdiff_t - ISO C 99
1888	jermar	711	*/
4347	svoboda	712	case 'h':
		713	/* Char or short */
1888	jermar	714	qualifier = PrintfQualifierShort;
4348	svoboda	715	i = nxt;
		716	uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
4347	svoboda	717	if (uc == 'h') {
4348	svoboda	718	i = nxt;
		719	uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
1888	jermar	720	qualifier = PrintfQualifierByte;
		721	}
		722	break;
4347	svoboda	723	case 'l':
		724	/* Long or long long */
1888	jermar	725	qualifier = PrintfQualifierLong;
4348	svoboda	726	i = nxt;
		727	uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
4347	svoboda	728	if (uc == 'l') {
4348	svoboda	729	i = nxt;
		730	uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
1888	jermar	731	qualifier = PrintfQualifierLongLong;
		732	}
		733	break;
		734	default:
4347	svoboda	735	/* Default type */
		736	qualifier = PrintfQualifierInt;
		737	}
1271	cejka	738
4347	svoboda	739	unsigned int base = 10;
		740
		741	switch (uc) {
1888	jermar	742	/*
4347	svoboda	743	* String and character conversions.
		744	*/
1888	jermar	745	case 's':
4347	svoboda	746	if (qualifier == PrintfQualifierLong)
4348	svoboda	747	retval = print_wstr(va_arg(ap, wchar_t *), width, precision, flags, ps);
4347	svoboda	748	else
4348	svoboda	749	retval = print_str(va_arg(ap, char *), width, precision, flags, ps);
4347	svoboda	750
		751	if (retval < 0) {
1888	jermar	752	counter = -counter;
		753	goto out;
4347	svoboda	754	}
		755
1888	jermar	756	counter += retval;
4348	svoboda	757	j = nxt;
1888	jermar	758	goto next_char;
		759	case 'c':
4347	svoboda	760	if (qualifier == PrintfQualifierLong)
		761	retval = print_wchar(va_arg(ap, wchar_t), width, flags, ps);
		762	else
		763	retval = print_char(va_arg(ap, unsigned int), width, flags, ps);
		764
2572	jermar	765	if (retval < 0) {
1888	jermar	766	counter = -counter;
		767	goto out;
		768	};
4347	svoboda	769
1888	jermar	770	counter += retval;
4348	svoboda	771	j = nxt;
1888	jermar	772	goto next_char;
4347	svoboda	773
		774	/*
1888	jermar	775	* Integer values
		776	*/
4347	svoboda	777	case 'P':
		778	/* Pointer */
3149	svoboda	779	flags \|= __PRINTF_FLAG_BIGCHARS;
1888	jermar	780	case 'p':
		781	flags \|= __PRINTF_FLAG_PREFIX;
		782	base = 16;
		783	qualifier = PrintfQualifierPointer;
4347	svoboda	784	break;
		785	case 'b':
1888	jermar	786	base = 2;
		787	break;
		788	case 'o':
		789	base = 8;
		790	break;
		791	case 'd':
		792	case 'i':
4347	svoboda	793	flags \|= __PRINTF_FLAG_SIGNED;
1888	jermar	794	case 'u':
		795	break;
		796	case 'X':
		797	flags \|= __PRINTF_FLAG_BIGCHARS;
		798	case 'x':
		799	base = 16;
		800	break;
4347	svoboda	801
		802	/* Percentile itself */
		803	case '%':
1888	jermar	804	j = i;
		805	goto next_char;
4347	svoboda	806
1888	jermar	807	/*
		808	* Bad formatting.
		809	*/
		810	default:
2572	jermar	811	/*
		812	* Unknown format. Now, j is the index of '%'
		813	* so we will print whole bad format sequence.
1888	jermar	814	*/
4347	svoboda	815	goto next_char;
1271	cejka	816	}
4347	svoboda	817
		818	/* Print integers */
		819	size_t size;
		820	uint64_t number;
1271	cejka	821	switch (qualifier) {
1888	jermar	822	case PrintfQualifierByte:
		823	size = sizeof(unsigned char);
3149	svoboda	824	number = (uint64_t) va_arg(ap, unsigned int);
1888	jermar	825	break;
		826	case PrintfQualifierShort:
		827	size = sizeof(unsigned short);
3149	svoboda	828	number = (uint64_t) va_arg(ap, unsigned int);
1888	jermar	829	break;
		830	case PrintfQualifierInt:
		831	size = sizeof(unsigned int);
3149	svoboda	832	number = (uint64_t) va_arg(ap, unsigned int);
1888	jermar	833	break;
		834	case PrintfQualifierLong:
		835	size = sizeof(unsigned long);
3149	svoboda	836	number = (uint64_t) va_arg(ap, unsigned long);
1888	jermar	837	break;
		838	case PrintfQualifierLongLong:
		839	size = sizeof(unsigned long long);
3149	svoboda	840	number = (uint64_t) va_arg(ap, unsigned long long);
1888	jermar	841	break;
		842	case PrintfQualifierPointer:
		843	size = sizeof(void *);
3149	svoboda	844	number = (uint64_t) (unsigned long) va_arg(ap, void *);
1888	jermar	845	break;
4347	svoboda	846	default:
		847	/* Unknown qualifier */
1888	jermar	848	counter = -counter;
		849	goto out;
1271	cejka	850	}
		851
		852	if (flags & __PRINTF_FLAG_SIGNED) {
2572	jermar	853	if (number & (0x1 << (size * 8 - 1))) {
1271	cejka	854	flags \|= __PRINTF_FLAG_NEGATIVE;
4347	svoboda	855
1780	jermar	856	if (size == sizeof(uint64_t)) {
3149	svoboda	857	number = -((int64_t) number);
1271	cejka	858	} else {
		859	number = ~number;
2572	jermar	860	number &=
		861	~(0xFFFFFFFFFFFFFFFFll <<
		862	(size * 8));
1271	cejka	863	number++;
		864	}
		865	}
		866	}
4347	svoboda	867
2572	jermar	868	if ((retval = print_number(number, width, precision,
		869	base, flags, ps)) < 0) {
1271	cejka	870	counter = -counter;
		871	goto out;
2572	jermar	872	}
4347	svoboda	873
1271	cejka	874	counter += retval;
4348	svoboda	875	j = nxt;
4347	svoboda	876	}
1271	cejka	877	next_char:
4348	svoboda	878	;
1271	cejka	879	}
		880
		881	if (i > j) {
4348	svoboda	882	if ((retval = printf_putnchars(&fmt[j], i - j, ps)) < 0) {
4347	svoboda	883	/* Error */
1271	cejka	884	counter = -counter;
		885	goto out;
		886	}
		887	counter += retval;
		888	}
4347	svoboda	889
1271	cejka	890	out:
4347	svoboda	891	return ((int) counter);
1271	cejka	892	}
		893
1888	jermar	894	/** @}
1702	cejka	895	*/

Subversion Repositories HelenOS

(root)/branches/dynload/kernel/generic/src/printf/printf_core.c – Rev 4401