WebSVN – HelenOS – Blame – /trunk/uspace/lib/libc/generic/io/printf_core.c

Rev	Author	Line No.	Line
974	cejka	1	/*
2071	jermar	2	* Copyright (c) 2001-2004 Jakub Jermar
		3	* Copyright (c) 2006 Josef Cejka
4234	svoboda	4	* Copyright (c) 2009 Martin Decky
974	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
4234	svoboda	31	/** @addtogroup generic
1653	cejka	32	* @{
		33	*/
1272	cejka	34	/**
1653	cejka	35	* @file
4234	svoboda	36	* @brief Printing functions.
1272	cejka	37	*/
		38
1234	cejka	39	#include <unistd.h>
974	cejka	40	#include <stdio.h>
1234	cejka	41	#include <io/printf_core.h>
1173	cejka	42	#include <ctype.h>
		43	#include <string.h>
974	cejka	44
4234	svoboda	45	/** show prefixes 0x or 0 */
		46	#define __PRINTF_FLAG_PREFIX 0x00000001
		47	/** signed / unsigned number */
		48	#define __PRINTF_FLAG_SIGNED 0x00000002
		49	/** print leading zeroes */
		50	#define __PRINTF_FLAG_ZEROPADDED 0x00000004
		51	/** align to left */
		52	#define __PRINTF_FLAG_LEFTALIGNED 0x00000010
		53	/** always show + sign */
		54	#define __PRINTF_FLAG_SHOWPLUS 0x00000020
		55	/** print space instead of plus */
		56	#define __PRINTF_FLAG_SPACESIGN 0x00000040
		57	/** show big characters */
		58	#define __PRINTF_FLAG_BIGCHARS 0x00000080
		59	/** number has - sign */
		60	#define __PRINTF_FLAG_NEGATIVE 0x00000100
995	cejka	61
4234	svoboda	62	/**
		63	* Buffer big enough for 64-bit number printed in base 2, sign, prefix and 0
		64	* to terminate string... (last one is only for better testing end of buffer by
		65	* zero-filling subroutine)
		66	*/
		67	#define PRINT_NUMBER_BUFFER_SIZE (64 + 5)
		68
1272	cejka	69	/** Enumeration of possible arguments types.
		70	*/
1073	cejka	71	typedef enum {
		72	PrintfQualifierByte = 0,
		73	PrintfQualifierShort,
		74	PrintfQualifierInt,
		75	PrintfQualifierLong,
		76	PrintfQualifierLongLong,
		77	PrintfQualifierPointer
		78	} qualifier_t;
974	cejka	79
4234	svoboda	80	static char nullstr[] = "(NULL)";
		81	static char digits_small[] = "0123456789abcdef";
		82	static char digits_big[] = "0123456789ABCDEF";
		83	static char invalch = U_SPECIAL;
995	cejka	84
4234	svoboda	85	/** Print one or more characters without adding newline.
		86	*
		87	* @param buf Buffer holding characters with size of
		88	* at least size bytes. NULL is not allowed!
		89	* @param size Size of the buffer in bytes.
		90	* @param ps Output method and its data.
		91	*
		92	* @return Number of characters printed.
		93	*
1234	cejka	94	*/
4234	svoboda	95	static int printf_putnchars(const char *buf, size_t size,
		96	printf_spec_t *ps)
1234	cejka	97	{
4234	svoboda	98	return ps->str_write((void *) buf, size, ps->data);
1234	cejka	99	}
1173	cejka	100
4234	svoboda	101	/** Print one or more wide characters without adding newline.
		102	*
		103	* @param buf Buffer holding wide characters with size of
		104	* at least size bytes. NULL is not allowed!
		105	* @param size Size of the buffer in bytes.
		106	* @param ps Output method and its data.
		107	*
		108	* @return Number of wide characters printed.
		109	*
1234	cejka	110	*/
4234	svoboda	111	static int printf_wputnchars(const wchar_t *buf, size_t size,
		112	printf_spec_t *ps)
1234	cejka	113	{
4234	svoboda	114	return ps->wstr_write((void *) buf, size, ps->data);
		115	}
		116
		117	/** Print string without adding a newline.
		118	*
		119	* @param str String to print.
		120	* @param ps Write function specification and support data.
		121	*
		122	* @return Number of characters printed.
		123	*
		124	*/
		125	static int printf_putstr(const char str, printf_spec_t ps)
		126	{
		127	if (str == NULL)
		128	return printf_putnchars(nullstr, str_size(nullstr), ps);
1234	cejka	129
4234	svoboda	130	return ps->str_write((void *) str, str_size(str), ps->data);
		131	}
1234	cejka	132
4234	svoboda	133	/** Print one ASCII character.
		134	*
		135	* @param c ASCII character to be printed.
		136	* @param ps Output method.
		137	*
		138	* @return Number of characters printed.
		139	*
		140	*/
		141	static int printf_putchar(const char ch, printf_spec_t *ps)
		142	{
		143	if (!ascii_check(ch))
		144	return ps->str_write((void *) &invalch, 1, ps->data);
		145
		146	return ps->str_write(&ch, 1, ps->data);
1234	cejka	147	}
		148
4234	svoboda	149	/** Print one wide character.
		150	*
		151	* @param c Wide character to be printed.
		152	* @param ps Output method.
		153	*
		154	* @return Number of characters printed.
		155	*
1234	cejka	156	*/
4234	svoboda	157	static int printf_putwchar(const wchar_t ch, printf_spec_t *ps)
1234	cejka	158	{
4234	svoboda	159	if (!chr_check(ch))
		160	return ps->str_write((void *) &invalch, 1, ps->data);
1234	cejka	161
4234	svoboda	162	return ps->wstr_write(&ch, sizeof(wchar_t), ps->data);
1234	cejka	163	}
		164
4234	svoboda	165	/** Print one formatted ASCII character.
		166	*
		167	* @param ch Character to print.
		168	* @param width Width modifier.
		169	* @param flags Flags that change the way the character is printed.
		170	*
		171	* @return Number of characters printed, negative value on failure.
		172	*
1173	cejka	173	*/
4234	svoboda	174	static int print_char(const char ch, int width, uint32_t flags, printf_spec_t *ps)
1173	cejka	175	{
4482	decky	176	size_t counter = 0;
4234	svoboda	177	if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
		178	while (--width > 0) {
		179	/*
		180	* One space is consumed by the character itself, hence
		181	* the predecrement.
		182	*/
		183	if (printf_putchar(' ', ps) > 0)
		184	counter++;
		185	}
		186	}
1173	cejka	187
4234	svoboda	188	if (printf_putchar(ch, ps) > 0)
		189	counter++;
		190
		191	while (--width > 0) {
2570	jermar	192	/*
4234	svoboda	193	* One space is consumed by the character itself, hence
		194	* the predecrement.
2570	jermar	195	*/
4234	svoboda	196	if (printf_putchar(' ', ps) > 0)
		197	counter++;
		198	}
		199
		200	return (int) (counter + 1);
		201	}
		202
		203	/** Print one formatted wide character.
		204	*
		205	* @param ch Character to print.
		206	* @param width Width modifier.
		207	* @param flags Flags that change the way the character is printed.
		208	*
		209	* @return Number of characters printed, negative value on failure.
		210	*
		211	*/
		212	static int print_wchar(const wchar_t ch, int width, uint32_t flags, printf_spec_t *ps)
		213	{
4482	decky	214	size_t counter = 0;
4234	svoboda	215	if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
2570	jermar	216	while (--width > 0) {
4234	svoboda	217	/*
		218	* One space is consumed by the character itself, hence
		219	* the predecrement.
		220	*/
		221	if (printf_putchar(' ', ps) > 0)
		222	counter++;
1173	cejka	223	}
		224	}
4234	svoboda	225
		226	if (printf_putwchar(ch, ps) > 0)
1617	cejka	227	counter++;
4234	svoboda	228
2570	jermar	229	while (--width > 0) {
4234	svoboda	230	/*
		231	* One space is consumed by the character itself, hence
		232	* the predecrement.
		233	*/
1617	cejka	234	if (printf_putchar(' ', ps) > 0)
4234	svoboda	235	counter++;
1173	cejka	236	}
		237
4234	svoboda	238	return (int) (counter + 1);
1173	cejka	239	}
		240
4234	svoboda	241	/** Print string.
		242	*
		243	* @param str String to be printed.
		244	* @param width Width modifier.
		245	* @param precision Precision modifier.
		246	* @param flags Flags that modify the way the string is printed.
		247	*
		248	* @return Number of characters printed, negative value on failure.
1173	cejka	249	*/
4234	svoboda	250	static int print_str(char *str, int width, unsigned int precision,
4245	decky	251	uint32_t flags, printf_spec_t *ps)
1173	cejka	252	{
4234	svoboda	253	if (str == NULL)
		254	return printf_putstr(nullstr, ps);
		255
		256	/* Print leading spaces. */
4482	decky	257	size_t strw = str_length(str);
4234	svoboda	258	if (precision == 0)
		259	precision = strw;
		260
		261	/* Left padding */
4482	decky	262	size_t counter = 0;
4234	svoboda	263	width -= precision;
		264	if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
		265	while (width-- > 0) {
		266	if (printf_putchar(' ', ps) == 1)
		267	counter++;
		268	}
		269	}
		270
		271	/* Part of @a str fitting into the alloted space. */
1617	cejka	272	int retval;
4234	svoboda	273	size_t size = str_lsize(str, precision);
		274	if ((retval = printf_putnchars(str, size, ps)) < 0)
		275	return -counter;
1173	cejka	276
4234	svoboda	277	counter += retval;
		278
		279	/* Right padding */
		280	while (width-- > 0) {
		281	if (printf_putchar(' ', ps) == 1)
		282	counter++;
1173	cejka	283	}
		284
4234	svoboda	285	return ((int) counter);
1173	cejka	286
4234	svoboda	287	}
1173	cejka	288
4234	svoboda	289	/** Print wide string.
		290	*
		291	* @param str Wide string to be printed.
		292	* @param width Width modifier.
		293	* @param precision Precision modifier.
		294	* @param flags Flags that modify the way the string is printed.
		295	*
		296	* @return Number of wide characters printed, negative value on failure.
		297	*/
		298	static int print_wstr(wchar_t *str, int width, unsigned int precision,
4245	decky	299	uint32_t flags, printf_spec_t *ps)
4234	svoboda	300	{
		301	if (str == NULL)
		302	return printf_putstr(nullstr, ps);
4245	decky	303
		304	if (*str == U_BOM)
		305	str++;
		306
4234	svoboda	307	/* Print leading spaces. */
		308	size_t strw = wstr_length(str);
		309	if (precision == 0)
		310	precision = strw;
4245	decky	311
4234	svoboda	312	/* Left padding */
4482	decky	313	size_t counter = 0;
1173	cejka	314	width -= precision;
		315	if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
4234	svoboda	316	while (width-- > 0) {
		317	if (printf_putchar(' ', ps) == 1)
1617	cejka	318	counter++;
1173	cejka	319	}
		320	}
4245	decky	321
4234	svoboda	322	/* Part of @a wstr fitting into the alloted space. */
		323	int retval;
		324	size_t size = wstr_lsize(str, precision);
		325	if ((retval = printf_wputnchars(str, size, ps)) < 0)
1617	cejka	326	return -counter;
4245	decky	327
4234	svoboda	328	counter += retval;
4245	decky	329
4234	svoboda	330	/* Right padding */
1173	cejka	331	while (width-- > 0) {
4234	svoboda	332	if (printf_putchar(' ', ps) == 1)
		333	counter++;
1173	cejka	334	}
4234	svoboda	335
		336	return ((int) counter);
1173	cejka	337	}
		338
4234	svoboda	339	/** Print a number in a given base.
974	cejka	340	*
4234	svoboda	341	* Print significant digits of a number in given base.
974	cejka	342	*
4234	svoboda	343	* @param num Number to print.
		344	* @param width Width modifier.
		345	* @param precision Precision modifier.
		346	* @param base Base to print the number in (must be between 2 and 16).
		347	* @param flags Flags that modify the way the number is printed.
974	cejka	348	*
4234	svoboda	349	* @return Number of characters printed.
		350	*
974	cejka	351	*/
2570	jermar	352	static int print_number(uint64_t num, int width, int precision, int base,
4234	svoboda	353	uint32_t flags, printf_spec_t *ps)
974	cejka	354	{
4234	svoboda	355	char *digits;
		356	if (flags & __PRINTF_FLAG_BIGCHARS)
		357	digits = digits_big;
		358	else
		359	digits = digits_small;
974	cejka	360
4234	svoboda	361	char data[PRINT_NUMBER_BUFFER_SIZE];
		362	char *ptr = &data[PRINT_NUMBER_BUFFER_SIZE - 1];
995	cejka	363
4234	svoboda	364	/* Size of number with all prefixes and signs */
		365	int size = 0;
		366
		367	/* Put zero at end of string */
		368	*ptr-- = 0;
		369
1073	cejka	370	if (num == 0) {
		371	*ptr-- = '0';
1173	cejka	372	size++;
1073	cejka	373	} else {
		374	do {
		375	*ptr-- = digits[num % base];
1173	cejka	376	size++;
1073	cejka	377	} while (num /= base);
		378	}
1234	cejka	379
4234	svoboda	380	/* Size of plain number */
		381	int number_size = size;
		382
2570	jermar	383	/*
4234	svoboda	384	* Collect the sum of all prefixes/signs/etc. to calculate padding and
		385	* leading zeroes.
2570	jermar	386	*/
1173	cejka	387	if (flags & __PRINTF_FLAG_PREFIX) {
1073	cejka	388	switch(base) {
4234	svoboda	389	case 2:
		390	/* Binary formating is not standard, but usefull */
2070	jermar	391	size += 2;
		392	break;
		393	case 8:
		394	size++;
		395	break;
		396	case 16:
		397	size += 2;
		398	break;
1073	cejka	399	}
		400	}
4234	svoboda	401
		402	char sgn = 0;
1073	cejka	403	if (flags & __PRINTF_FLAG_SIGNED) {
		404	if (flags & __PRINTF_FLAG_NEGATIVE) {
1173	cejka	405	sgn = '-';
		406	size++;
1073	cejka	407	} else if (flags & __PRINTF_FLAG_SHOWPLUS) {
2570	jermar	408	sgn = '+';
		409	size++;
		410	} else if (flags & __PRINTF_FLAG_SPACESIGN) {
		411	sgn = ' ';
		412	size++;
		413	}
1073	cejka	414	}
4234	svoboda	415
		416	if (flags & __PRINTF_FLAG_LEFTALIGNED)
1073	cejka	417	flags &= ~__PRINTF_FLAG_ZEROPADDED;
4234	svoboda	418
2570	jermar	419	/*
4234	svoboda	420	* If the number is left-aligned or precision is specified then
		421	* padding with zeros is ignored.
2570	jermar	422	*/
1073	cejka	423	if (flags & __PRINTF_FLAG_ZEROPADDED) {
4234	svoboda	424	if ((precision == 0) && (width > size))
1234	cejka	425	precision = width - size + number_size;
1073	cejka	426	}
4234	svoboda	427
		428	/* Print leading spaces */
		429	if (number_size > precision) {
		430	/* Print the whole number, not only a part */
1234	cejka	431	precision = number_size;
4234	svoboda	432	}
		433
1234	cejka	434	width -= precision + size - number_size;
4482	decky	435	size_t counter = 0;
1073	cejka	436
1173	cejka	437	if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
4234	svoboda	438	while (width-- > 0) {
		439	if (printf_putchar(' ', ps) == 1)
1617	cejka	440	counter++;
1173	cejka	441	}
		442	}
		443
4234	svoboda	444	/* Print sign */
1173	cejka	445	if (sgn) {
1617	cejka	446	if (printf_putchar(sgn, ps) == 1)
		447	counter++;
1173	cejka	448	}
		449
4234	svoboda	450	/* Print prefix */
1173	cejka	451	if (flags & __PRINTF_FLAG_PREFIX) {
		452	switch(base) {
4234	svoboda	453	case 2:
		454	/* Binary formating is not standard, but usefull */
2070	jermar	455	if (printf_putchar('0', ps) == 1)
		456	counter++;
		457	if (flags & __PRINTF_FLAG_BIGCHARS) {
		458	if (printf_putchar('B', ps) == 1)
1617	cejka	459	counter++;
2070	jermar	460	} else {
		461	if (printf_putchar('b', ps) == 1)
1617	cejka	462	counter++;
2070	jermar	463	}
		464	break;
		465	case 8:
		466	if (printf_putchar('o', ps) == 1)
		467	counter++;
		468	break;
		469	case 16:
		470	if (printf_putchar('0', ps) == 1)
		471	counter++;
		472	if (flags & __PRINTF_FLAG_BIGCHARS) {
		473	if (printf_putchar('X', ps) == 1)
1617	cejka	474	counter++;
2070	jermar	475	} else {
		476	if (printf_putchar('x', ps) == 1)
		477	counter++;
		478	}
		479	break;
1173	cejka	480	}
		481	}
4234	svoboda	482
		483	/* Print leading zeroes */
1234	cejka	484	precision -= number_size;
4234	svoboda	485	while (precision-- > 0) {
1617	cejka	486	if (printf_putchar('0', ps) == 1)
		487	counter++;
1173	cejka	488	}
		489
4234	svoboda	490	/* Print the number itself */
		491	int retval;
		492	if ((retval = printf_putstr(++ptr, ps)) > 0)
1617	cejka	493	counter += retval;
1173	cejka	494
4234	svoboda	495	/* Print tailing spaces */
1173	cejka	496
4234	svoboda	497	while (width-- > 0) {
		498	if (printf_putchar(' ', ps) == 1)
1617	cejka	499	counter++;
1173	cejka	500	}
4234	svoboda	501
		502	return ((int) counter);
974	cejka	503	}
		504
1272	cejka	505	/** Print formatted string.
974	cejka	506	*
2570	jermar	507	* Print string formatted according to the fmt parameter and variadic arguments.
		508	* Each formatting directive must have the following form:
974	cejka	509	*
4234	svoboda	510	* \% [ FLAGS ] [ WIDTH ] [ .PRECISION ] [ TYPE ] CONVERSION
		511	*
1272	cejka	512	* FLAGS:@n
4234	svoboda	513	* - "#" Force to print prefix. For \%o conversion, the prefix is 0, for
		514	* \%x and \%X prefixes are 0x and 0X and for conversion \%b the
		515	* prefix is 0b.
1272	cejka	516	*
4234	svoboda	517	* - "-" Align to left.
1272	cejka	518	*
4234	svoboda	519	* - "+" Print positive sign just as negative.
1272	cejka	520	*
4234	svoboda	521	* - " " If the printed number is positive and "+" flag is not set,
		522	* print space in place of sign.
1272	cejka	523	*
4234	svoboda	524	* - "0" Print 0 as padding instead of spaces. Zeroes are placed between
		525	* sign and the rest of the number. This flag is ignored if "-"
		526	* flag is specified.
		527	*
1272	cejka	528	* WIDTH:@n
4234	svoboda	529	* - Specify the minimal width of a printed argument. If it is bigger,
		530	* width is ignored. If width is specified with a "*" character instead of
		531	* number, width is taken from parameter list. And integer parameter is
		532	* expected before parameter for processed conversion specification. If
		533	* this value is negative its absolute value is taken and the "-" flag is
		534	* set.
974	cejka	535	*
1272	cejka	536	* PRECISION:@n
4234	svoboda	537	* - Value precision. For numbers it specifies minimum valid numbers.
		538	* Smaller numbers are printed with leading zeroes. Bigger numbers are not
		539	* affected. Strings with more than precision characters are cut off. Just
		540	* as with width, an "*" can be used used instead of a number. An integer
		541	* value is then expected in parameters. When both width and precision are
		542	* specified using "*", the first parameter is used for width and the
		543	* second one for precision.
		544	*
1272	cejka	545	* TYPE:@n
4234	svoboda	546	* - "hh" Signed or unsigned char.@n
		547	* - "h" Signed or unsigned short.@n
		548	* - "" Signed or unsigned int (default value).@n
		549	* - "l" Signed or unsigned long int.@n
		550	* If conversion is "c", the character is wchar_t (wide character).@n
		551	* If conversion is "s", the string is wchar_t * (wide string).@n
		552	* - "ll" Signed or unsigned long long int.@n
		553	*
1272	cejka	554	* CONVERSION:@n
4234	svoboda	555	* - % Print percentile character itself.
974	cejka	556	*
4234	svoboda	557	* - c Print single character. The character is expected to be plain
		558	* ASCII (e.g. only values 0 .. 127 are valid).@n
		559	* If type is "l", then the character is expected to be wide character
		560	* (e.g. values 0 .. 0x10ffff are valid).
974	cejka	561	*
4234	svoboda	562	* - s Print zero terminated string. If a NULL value is passed as
		563	* value, "(NULL)" is printed instead.@n
		564	* If type is "l", then the string is expected to be wide string.
974	cejka	565	*
4234	svoboda	566	* - P, p Print value of a pointer. Void * value is expected and it is
		567	* printed in hexadecimal notation with prefix (as with \%#X / \%#x
		568	* for 32-bit or \%#X / \%#x for 64-bit long pointers).
974	cejka	569	*
4234	svoboda	570	* - b Print value as unsigned binary number. Prefix is not printed by
		571	* default. (Nonstandard extension.)
974	cejka	572	*
4234	svoboda	573	* - o Print value as unsigned octal number. Prefix is not printed by
		574	* default.
974	cejka	575	*
4234	svoboda	576	* - d, i Print signed decimal number. There is no difference between d
		577	* and i conversion.
		578	*
		579	* - u Print unsigned decimal number.
		580	*
		581	* - X, x Print hexadecimal number with upper- or lower-case. Prefix is
		582	* not printed by default.
		583	*
		584	* All other characters from fmt except the formatting directives are printed
2570	jermar	585	* verbatim.
974	cejka	586	*
4234	svoboda	587	* @param fmt Format NULL-terminated string.
		588	*
		589	* @return Number of characters printed, negative value on failure.
		590	*
974	cejka	591	*/
4234	svoboda	592	int printf_core(const char fmt, printf_spec_t ps, va_list ap)
974	cejka	593	{
4234	svoboda	594	size_t i; /* Index of the currently processed character from fmt */
		595	size_t nxt = 0; /* Index of the next character from fmt */
		596	size_t j = 0; /* Index to the first not printed nonformating character */
974	cejka	597
4482	decky	598	size_t counter = 0; /* Number of characters printed */
4234	svoboda	599	int retval; /* Return values from nested functions */
1173	cejka	600
4234	svoboda	601	while (true) {
		602	i = nxt;
		603	wchar_t uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
		604
		605	if (uc == 0)
		606	break;
		607
		608	/* Control character */
		609	if (uc == '%') {
		610	/* Print common characters if any processed */
974	cejka	611	if (i > j) {
4234	svoboda	612	if ((retval = printf_putnchars(&fmt[j], i - j, ps)) < 0) {
		613	/* Error */
		614	counter = -counter;
		615	goto out;
974	cejka	616	}
		617	counter += retval;
		618	}
4234	svoboda	619
1073	cejka	620	j = i;
		621
4234	svoboda	622	/* Parse modifiers */
		623	uint32_t flags = 0;
		624	bool end = false;
		625
1073	cejka	626	do {
4234	svoboda	627	i = nxt;
		628	uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
		629	switch (uc) {
2570	jermar	630	case '#':
		631	flags \|= __PRINTF_FLAG_PREFIX;
		632	break;
		633	case '-':
		634	flags \|= __PRINTF_FLAG_LEFTALIGNED;
		635	break;
		636	case '+':
		637	flags \|= __PRINTF_FLAG_SHOWPLUS;
		638	break;
		639	case ' ':
		640	flags \|= __PRINTF_FLAG_SPACESIGN;
		641	break;
		642	case '0':
		643	flags \|= __PRINTF_FLAG_ZEROPADDED;
		644	break;
		645	default:
4234	svoboda	646	end = true;
		647	};
		648	} while (!end);
1173	cejka	649
4234	svoboda	650	/* Width & '' operator /
		651	int width = 0;
		652	if (isdigit(uc)) {
		653	while (true) {
1173	cejka	654	width *= 10;
4234	svoboda	655	width += uc - '0';
		656
		657	i = nxt;
		658	uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
		659	if (uc == 0)
		660	break;
		661	if (!isdigit(uc))
		662	break;
1173	cejka	663	}
4234	svoboda	664	} else if (uc == '*') {
		665	/* Get width value from argument list */
		666	i = nxt;
		667	uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
		668	width = (int) va_arg(ap, int);
1173	cejka	669	if (width < 0) {
4234	svoboda	670	/* Negative width sets '-' flag */
1173	cejka	671	width *= -1;
		672	flags \|= __PRINTF_FLAG_LEFTALIGNED;
		673	}
		674	}
		675
4234	svoboda	676	/* Precision and '' operator /
		677	int precision = 0;
		678	if (uc == '.') {
		679	i = nxt;
		680	uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
		681	if (isdigit(uc)) {
		682	while (true) {
1173	cejka	683	precision *= 10;
4234	svoboda	684	precision += uc - '0';
		685
		686	i = nxt;
		687	uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
		688	if (uc == 0)
		689	break;
		690	if (!isdigit(uc))
		691	break;
1173	cejka	692	}
4234	svoboda	693	} else if (uc == '*') {
		694	/* Get precision value from the argument list */
		695	i = nxt;
		696	uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
		697	precision = (int) va_arg(ap, int);
1173	cejka	698	if (precision < 0) {
4234	svoboda	699	/* Ignore negative precision */
1173	cejka	700	precision = 0;
		701	}
		702	}
		703	}
4234	svoboda	704
		705	qualifier_t qualifier;
		706
		707	switch (uc) {
		708	/** @todo Unimplemented qualifiers:
		709	* t ptrdiff_t - ISO C 99
2070	jermar	710	*/
4234	svoboda	711	case 'h':
		712	/* Char or short */
2070	jermar	713	qualifier = PrintfQualifierShort;
4234	svoboda	714	i = nxt;
		715	uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
		716	if (uc == 'h') {
		717	i = nxt;
		718	uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
2070	jermar	719	qualifier = PrintfQualifierByte;
		720	}
		721	break;
4234	svoboda	722	case 'l':
		723	/* Long or long long */
2070	jermar	724	qualifier = PrintfQualifierLong;
4234	svoboda	725	i = nxt;
		726	uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
		727	if (uc == 'l') {
		728	i = nxt;
		729	uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
2070	jermar	730	qualifier = PrintfQualifierLongLong;
		731	}
		732	break;
		733	default:
4234	svoboda	734	/* Default type */
2570	jermar	735	qualifier = PrintfQualifierInt;
4234	svoboda	736	}
1073	cejka	737
4234	svoboda	738	unsigned int base = 10;
		739
		740	switch (uc) {
2570	jermar	741	/*
		742	* String and character conversions.
		743	*/
2070	jermar	744	case 's':
4234	svoboda	745	if (qualifier == PrintfQualifierLong)
		746	retval = print_wstr(va_arg(ap, wchar_t *), width, precision, flags, ps);
		747	else
		748	retval = print_str(va_arg(ap, char *), width, precision, flags, ps);
		749
		750	if (retval < 0) {
		751	counter = -counter;
		752	goto out;
2070	jermar	753	}
4234	svoboda	754
2070	jermar	755	counter += retval;
4234	svoboda	756	j = nxt;
2070	jermar	757	goto next_char;
		758	case 'c':
4234	svoboda	759	if (qualifier == PrintfQualifierLong)
		760	retval = print_wchar(va_arg(ap, wchar_t), width, flags, ps);
		761	else
		762	retval = print_char(va_arg(ap, unsigned int), width, flags, ps);
		763
2570	jermar	764	if (retval < 0) {
4234	svoboda	765	counter = -counter;
		766	goto out;
		767	};
		768
2070	jermar	769	counter += retval;
4234	svoboda	770	j = nxt;
2070	jermar	771	goto next_char;
4234	svoboda	772
		773	/*
2070	jermar	774	* Integer values
2570	jermar	775	*/
4234	svoboda	776	case 'P':
		777	/* Pointer */
		778	flags \|= __PRINTF_FLAG_BIGCHARS;
2070	jermar	779	case 'p':
		780	flags \|= __PRINTF_FLAG_PREFIX;
		781	base = 16;
		782	qualifier = PrintfQualifierPointer;
4234	svoboda	783	break;
		784	case 'b':
2070	jermar	785	base = 2;
		786	break;
		787	case 'o':
		788	base = 8;
		789	break;
		790	case 'd':
		791	case 'i':
4234	svoboda	792	flags \|= __PRINTF_FLAG_SIGNED;
2070	jermar	793	case 'u':
		794	break;
		795	case 'X':
		796	flags \|= __PRINTF_FLAG_BIGCHARS;
		797	case 'x':
		798	base = 16;
		799	break;
4234	svoboda	800
		801	/* Percentile itself */
		802	case '%':
2070	jermar	803	j = i;
		804	goto next_char;
4234	svoboda	805
2070	jermar	806	/*
2570	jermar	807	* Bad formatting.
		808	*/
2070	jermar	809	default:
2570	jermar	810	/*
4234	svoboda	811	* Unknown format. Now, j is the index of '%'
		812	* so we will print whole bad format sequence.
2070	jermar	813	*/
4234	svoboda	814	goto next_char;
1073	cejka	815	}
4234	svoboda	816
2570	jermar	817	/* Print integers */
4234	svoboda	818	size_t size;
		819	uint64_t number;
1073	cejka	820	switch (qualifier) {
2070	jermar	821	case PrintfQualifierByte:
		822	size = sizeof(unsigned char);
4234	svoboda	823	number = (uint64_t) va_arg(ap, unsigned int);
2070	jermar	824	break;
		825	case PrintfQualifierShort:
		826	size = sizeof(unsigned short);
4234	svoboda	827	number = (uint64_t) va_arg(ap, unsigned int);
2070	jermar	828	break;
		829	case PrintfQualifierInt:
		830	size = sizeof(unsigned int);
4234	svoboda	831	number = (uint64_t) va_arg(ap, unsigned int);
2070	jermar	832	break;
		833	case PrintfQualifierLong:
		834	size = sizeof(unsigned long);
4234	svoboda	835	number = (uint64_t) va_arg(ap, unsigned long);
2070	jermar	836	break;
		837	case PrintfQualifierLongLong:
		838	size = sizeof(unsigned long long);
4234	svoboda	839	number = (uint64_t) va_arg(ap, unsigned long long);
2070	jermar	840	break;
		841	case PrintfQualifierPointer:
		842	size = sizeof(void *);
4234	svoboda	843	number = (uint64_t) (unsigned long) va_arg(ap, void *);
2070	jermar	844	break;
4234	svoboda	845	default:
		846	/* Unknown qualifier */
		847	counter = -counter;
		848	goto out;
974	cejka	849	}
1073	cejka	850
		851	if (flags & __PRINTF_FLAG_SIGNED) {
2570	jermar	852	if (number & (0x1 << (size * 8 - 1))) {
1073	cejka	853	flags \|= __PRINTF_FLAG_NEGATIVE;
4234	svoboda	854
1073	cejka	855	if (size == sizeof(uint64_t)) {
4234	svoboda	856	number = -((int64_t) number);
1073	cejka	857	} else {
		858	number = ~number;
2570	jermar	859	number &=
		860	~(0xFFFFFFFFFFFFFFFFll <<
		861	(size * 8));
1073	cejka	862	number++;
		863	}
		864	}
		865	}
4234	svoboda	866
2570	jermar	867	if ((retval = print_number(number, width, precision,
4234	svoboda	868	base, flags, ps)) < 0) {
		869	counter = -counter;
		870	goto out;
2570	jermar	871	}
4234	svoboda	872
1073	cejka	873	counter += retval;
4234	svoboda	874	j = nxt;
		875	}
1073	cejka	876	next_char:
4234	svoboda	877	;
974	cejka	878	}
		879
975	cejka	880	if (i > j) {
4234	svoboda	881	if ((retval = printf_putnchars(&fmt[j], i - j, ps)) < 0) {
		882	/* Error */
		883	counter = -counter;
		884	goto out;
975	cejka	885	}
		886	counter += retval;
		887	}
		888
4234	svoboda	889	out:
		890	return ((int) counter);
974	cejka	891	}
		892
1866	jermar	893	/** @}
1653	cejka	894	*/

Subversion Repositories HelenOS

(root)/trunk/uspace/lib/libc/generic/io/printf_core.c – Rev 4482