[linux-2.6-block.git] / arch / x86 / boot / printf.c

/* -*- linux-c -*- ------------------------------------------------------- *
 *
 *   Copyright (C) 1991, 1992 Linus Torvalds
 *   Copyright 2007 rPath, Inc. - All Rights Reserved
 *
 *   This file is part of the Linux kernel, and is made available under
 *   the terms of the GNU General Public License version 2.
 *
 * ----------------------------------------------------------------------- */

/*
 * Oh, it's a waste of space, but oh-so-yummy for debugging.  This
 * version of printf() does not include 64-bit support.  "Live with
 * it."
 *
 */

#include "boot.h"

static int skip_atoi(const char **s)
{
	int i = 0;

	while (isdigit(**s))
		i = i * 10 + *((*s)++) - '0';
	return i;
}

#define ZEROPAD	1		/* pad with zero */
#define SIGN	2		/* unsigned/signed long */
#define PLUS	4		/* show plus */
#define SPACE	8		/* space if plus */
#define LEFT	16		/* left justified */
#define SMALL	32		/* Must be 32 == 0x20 */
#define SPECIAL	64		/* 0x */

#define __do_div(n, base) ({ \
int __res; \
__res = ((unsigned long) n) % (unsigned) base; \
n = ((unsigned long) n) / (unsigned) base; \
__res; })

static char *number(char *str, long num, int base, int size, int precision,
		    int type)
{
	/* we are called with base 8, 10 or 16, only, thus don't need "G..."  */
	static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */

	char tmp[66];
	char c, sign, locase;
	int i;

	/* locase = 0 or 0x20. ORing digits or letters with 'locase'
	 * produces same digits or (maybe lowercased) letters */
	locase = (type & SMALL);
	if (type & LEFT)
		type &= ~ZEROPAD;
	if (base < 2 || base > 16)
		return NULL;
	c = (type & ZEROPAD) ? '0' : ' ';
	sign = 0;
	if (type & SIGN) {
		if (num < 0) {
			sign = '-';
			num = -num;
			size--;
		} else if (type & PLUS) {
			sign = '+';
			size--;
		} else if (type & SPACE) {
			sign = ' ';
			size--;
		}
	}
	if (type & SPECIAL) {
		if (base == 16)
			size -= 2;
		else if (base == 8)
			size--;
	}
	i = 0;
	if (num == 0)
		tmp[i++] = '0';
	else
		while (num != 0)
			tmp[i++] = (digits[__do_div(num, base)] | locase);
	if (i > precision)
		precision = i;
	size -= precision;
	if (!(type & (ZEROPAD + LEFT)))
		while (size-- > 0)
			*str++ = ' ';
	if (sign)
		*str++ = sign;
	if (type & SPECIAL) {
		if (base == 8)
			*str++ = '0';
		else if (base == 16) {
			*str++ = '0';
			*str++ = ('X' | locase);
		}
	}
	if (!(type & LEFT))
		while (size-- > 0)
			*str++ = c;
	while (i < precision--)
		*str++ = '0';
	while (i-- > 0)
		*str++ = tmp[i];
	while (size-- > 0)
		*str++ = ' ';
	return str;
}

int vsprintf(char *buf, const char *fmt, va_list args)
{
	int len;
	unsigned long num;
	int i, base;
	char *str;
	const char *s;

	int flags;		/* flags to number() */

	int field_width;	/* width of output field */
	int precision;		/* min. # of digits for integers; max
				   number of chars for from string */
	int qualifier;		/* 'h', 'l', or 'L' for integer fields */

	for (str = buf; *fmt; ++fmt) {
		if (*fmt != '%') {
			*str++ = *fmt;
			continue;
		}

		/* process flags */
		flags = 0;
	      repeat:
		++fmt;		/* this also skips first '%' */
		switch (*fmt) {
		case '-':
			flags |= LEFT;
			goto repeat;
		case '+':
			flags |= PLUS;
			goto repeat;
		case ' ':
			flags |= SPACE;
			goto repeat;
		case '#':
			flags |= SPECIAL;
			goto repeat;
		case '0':
			flags |= ZEROPAD;
			goto repeat;
		}

		/* get field width */
		field_width = -1;
		if (isdigit(*fmt))
			field_width = skip_atoi(&fmt);
		else if (*fmt == '*') {
			++fmt;
			/* it's the next argument */
			field_width = va_arg(args, int);
			if (field_width < 0) {
				field_width = -field_width;
				flags |= LEFT;
			}
		}

		/* get the precision */
		precision = -1;
		if (*fmt == '.') {
			++fmt;
			if (isdigit(*fmt))
				precision = skip_atoi(&fmt);
			else if (*fmt == '*') {
				++fmt;
				/* it's the next argument */
				precision = va_arg(args, int);
			}
			if (precision < 0)
				precision = 0;
		}

		/* get the conversion qualifier */
		qualifier = -1;
		if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L') {
			qualifier = *fmt;
			++fmt;
		}

		/* default base */
		base = 10;

		switch (*fmt) {
		case 'c':
			if (!(flags & LEFT))
				while (--field_width > 0)
					*str++ = ' ';
			*str++ = (unsigned char)va_arg(args, int);
			while (--field_width > 0)
				*str++ = ' ';
			continue;

		case 's':
			s = va_arg(args, char *);
			len = strnlen(s, precision);

			if (!(flags & LEFT))
				while (len < field_width--)
					*str++ = ' ';
			for (i = 0; i < len; ++i)
				*str++ = *s++;
			while (len < field_width--)
				*str++ = ' ';
			continue;

		case 'p':
			if (field_width == -1) {
				field_width = 2 * sizeof(void *);
				flags |= ZEROPAD;
			}
			str = number(str,
				     (unsigned long)va_arg(args, void *), 16,
				     field_width, precision, flags);
			continue;

		case 'n':
			if (qualifier == 'l') {
				long *ip = va_arg(args, long *);
				*ip = (str - buf);
			} else {
				int *ip = va_arg(args, int *);
				*ip = (str - buf);
			}
			continue;

		case '%':
			*str++ = '%';
			continue;

			/* integer number formats - set up the flags and "break" */
		case 'o':
			base = 8;
			break;

		case 'x':
			flags |= SMALL;
		case 'X':
			base = 16;
			break;

		case 'd':
		case 'i':
			flags |= SIGN;
		case 'u':
			break;

		default:
			*str++ = '%';
			if (*fmt)
				*str++ = *fmt;
			else
				--fmt;
			continue;
		}
		if (qualifier == 'l')
			num = va_arg(args, unsigned long);
		else if (qualifier == 'h') {
			num = (unsigned short)va_arg(args, int);
			if (flags & SIGN)
				num = (short)num;
		} else if (flags & SIGN)
			num = va_arg(args, int);
		else
			num = va_arg(args, unsigned int);
		str = number(str, num, base, field_width, precision, flags);
	}
	*str = '\0';
	return str - buf;
}

int sprintf(char *buf, const char *fmt, ...)
{
	va_list args;
	int i;

	va_start(args, fmt);
	i = vsprintf(buf, fmt, args);
	va_end(args);
	return i;
}

int printf(const char *fmt, ...)
{
	char printf_buf[1024];
	va_list args;
	int printed;

	va_start(args, fmt);
	printed = vsprintf(printf_buf, fmt, args);
	va_end(args);

	puts(printf_buf);

	return printed;
}
Commit	Line	Data
1543610a PA	1	/* -- linux-c -- ------------------------------------------------------- *
	2	*
	3	* Copyright (C) 1991, 1992 Linus Torvalds
	4	* Copyright 2007 rPath, Inc. - All Rights Reserved
	5	*
	6	* This file is part of the Linux kernel, and is made available under
	7	* the terms of the GNU General Public License version 2.
	8	*
	9	* ----------------------------------------------------------------------- */
	10
	11	/*
1543610a PA	12	* Oh, it's a waste of space, but oh-so-yummy for debugging. This
	13	* version of printf() does not include 64-bit support. "Live with
	14	* it."
	15	*
	16	*/
	17
	18	#include "boot.h"
	19
	20	static int skip_atoi(const char **s)
	21	{
	22	int i = 0;
	23
	24	while (isdigit(**s))
	25	i = i * 10 + ((s)++) - '0';
	26	return i;
	27	}
	28
	29	#define ZEROPAD 1 /* pad with zero */
	30	#define SIGN 2 /* unsigned/signed long */
	31	#define PLUS 4 /* show plus */
	32	#define SPACE 8 /* space if plus */
	33	#define LEFT 16 /* left justified */
9b706aee DV	34	#define SMALL 32 /* Must be 32 == 0x20 */
9b706aee DV	35	#define SPECIAL 64 /* 0x */
1543610a	36
f4ed2877	37	#define __do_div(n, base) ({ \
1543610a PA	38	int __res; \
	39	__res = ((unsigned long) n) % (unsigned) base; \
	40	n = ((unsigned long) n) / (unsigned) base; \
	41	__res; })
	42
	43	static char number(char str, long num, int base, int size, int precision,
	44	int type)
	45	{
9b706aee DV	46	/* we are called with base 8, 10 or 16, only, thus don't need "G..." */
	47	static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
	48
	49	char tmp[66];
	50	char c, sign, locase;
1543610a PA	51	int i;
1543610a PA	52
9b706aee DV	53	/* locase = 0 or 0x20. ORing digits or letters with 'locase'
	54	* produces same digits or (maybe lowercased) letters */
	55	locase = (type & SMALL);
1543610a PA	56	if (type & LEFT)
1543610a PA	57	type &= ~ZEROPAD;
5b8fafca	58	if (base < 2 \|\| base > 16)
7fafd91d	59	return NULL;
1543610a PA	60	c = (type & ZEROPAD) ? '0' : ' ';
	61	sign = 0;
	62	if (type & SIGN) {
	63	if (num < 0) {
	64	sign = '-';
	65	num = -num;
	66	size--;
	67	} else if (type & PLUS) {
	68	sign = '+';
	69	size--;
	70	} else if (type & SPACE) {
	71	sign = ' ';
	72	size--;
	73	}
	74	}
	75	if (type & SPECIAL) {
	76	if (base == 16)
	77	size -= 2;
	78	else if (base == 8)
	79	size--;
	80	}
	81	i = 0;
	82	if (num == 0)
	83	tmp[i++] = '0';
	84	else
	85	while (num != 0)
f4ed2877	86	tmp[i++] = (digits[__do_div(num, base)] \| locase);
1543610a PA	87	if (i > precision)
	88	precision = i;
	89	size -= precision;
	90	if (!(type & (ZEROPAD + LEFT)))
	91	while (size-- > 0)
	92	*str++ = ' ';
	93	if (sign)
	94	*str++ = sign;
	95	if (type & SPECIAL) {
	96	if (base == 8)
	97	*str++ = '0';
	98	else if (base == 16) {
	99	*str++ = '0';
9b706aee	100	*str++ = ('X' \| locase);
1543610a PA	101	}
	102	}
	103	if (!(type & LEFT))
	104	while (size-- > 0)
	105	*str++ = c;
	106	while (i < precision--)
	107	*str++ = '0';
	108	while (i-- > 0)
	109	*str++ = tmp[i];
	110	while (size-- > 0)
	111	*str++ = ' ';
	112	return str;
	113	}
	114
	115	int vsprintf(char buf, const char fmt, va_list args)
	116	{
	117	int len;
	118	unsigned long num;
	119	int i, base;
	120	char *str;
	121	const char *s;
	122
	123	int flags; /* flags to number() */
	124
	125	int field_width; /* width of output field */
	126	int precision; /* min. # of digits for integers; max
	127	number of chars for from string */
	128	int qualifier; /* 'h', 'l', or 'L' for integer fields */
	129
	130	for (str = buf; *fmt; ++fmt) {
	131	if (*fmt != '%') {
	132	str++ = fmt;
	133	continue;
	134	}
	135
	136	/* process flags */
	137	flags = 0;
	138	repeat:
	139	++fmt; /* this also skips first '%' */
	140	switch (*fmt) {
	141	case '-':
	142	flags \|= LEFT;
	143	goto repeat;
	144	case '+':
	145	flags \|= PLUS;
	146	goto repeat;
	147	case ' ':
	148	flags \|= SPACE;
	149	goto repeat;
	150	case '#':
	151	flags \|= SPECIAL;
	152	goto repeat;
	153	case '0':
	154	flags \|= ZEROPAD;
	155	goto repeat;
	156	}
	157
	158	/* get field width */
	159	field_width = -1;
	160	if (isdigit(*fmt))
	161	field_width = skip_atoi(&fmt);
	162	else if (fmt == '') {
	163	++fmt;
	164	/* it's the next argument */
165	field_width = va_arg(args, int);
166	if (field_width < 0) {
167	field_width = -field_width;
168	flags \|= LEFT;
169	}
170	}
171
172	/* get the precision */
173	precision = -1;
174	if (*fmt == '.') {
175	++fmt;
176	if (isdigit(*fmt))
177	precision = skip_atoi(&fmt);
178	else if (fmt == '') {
179	++fmt;
180	/* it's the next argument */
181	precision = va_arg(args, int);
182	}
183	if (precision < 0)
184	precision = 0;
185	}
186
187	/* get the conversion qualifier */
188	qualifier = -1;
189	if (fmt == 'h' \|\| fmt == 'l' \|\| *fmt == 'L') {
190	qualifier = *fmt;
191	++fmt;
192	}
193
194	/* default base */
195	base = 10;
196
197	switch (*fmt) {
198	case 'c':
199	if (!(flags & LEFT))
200	while (--field_width > 0)
201	*str++ = ' ';
202	*str++ = (unsigned char)va_arg(args, int);
203	while (--field_width > 0)
204	*str++ = ' ';
205	continue;
206
207	case 's':
208	s = va_arg(args, char *);
209	len = strnlen(s, precision);
210
211	if (!(flags & LEFT))
212	while (len < field_width--)
213	*str++ = ' ';
214	for (i = 0; i < len; ++i)
215	str++ = s++;
216	while (len < field_width--)
217	*str++ = ' ';
218	continue;
219
220	case 'p':
221	if (field_width == -1) {
222	field_width = 2 * sizeof(void *);
223	flags \|= ZEROPAD;
224	}
225	str = number(str,
226	(unsigned long)va_arg(args, void *), 16,
227	field_width, precision, flags);
228	continue;
229
230	case 'n':
231	if (qualifier == 'l') {
232	long ip = va_arg(args, long );
233	*ip = (str - buf);
234	} else {
235	int ip = va_arg(args, int );
236	*ip = (str - buf);
237	}
238	continue;
239
240	case '%':
241	*str++ = '%';
242	continue;
243
244	/* integer number formats - set up the flags and "break" */
245	case 'o':
246	base = 8;
247	break;
248
1543610a	249	case 'x':
9b706aee DV	250	flags \|= SMALL;
9b706aee DV	251	case 'X':
1543610a PA	252	base = 16;
	253	break;
	254
	255	case 'd':
	256	case 'i':
	257	flags \|= SIGN;
	258	case 'u':
	259	break;
	260
	261	default:
	262	*str++ = '%';
	263	if (*fmt)
	264	str++ = fmt;
	265	else
	266	--fmt;
	267	continue;
	268	}
	269	if (qualifier == 'l')
	270	num = va_arg(args, unsigned long);
	271	else if (qualifier == 'h') {
	272	num = (unsigned short)va_arg(args, int);
	273	if (flags & SIGN)
	274	num = (short)num;
	275	} else if (flags & SIGN)
	276	num = va_arg(args, int);
	277	else
	278	num = va_arg(args, unsigned int);
	279	str = number(str, num, base, field_width, precision, flags);
	280	}
	281	*str = '\0';
	282	return str - buf;
	283	}
	284
	285	int sprintf(char buf, const char fmt, ...)
	286	{
	287	va_list args;
	288	int i;
	289
	290	va_start(args, fmt);
	291	i = vsprintf(buf, fmt, args);
	292	va_end(args);
	293	return i;
	294	}
	295
	296	int printf(const char *fmt, ...)
	297	{
	298	char printf_buf[1024];
	299	va_list args;
	300	int printed;
	301
	302	va_start(args, fmt);
	303	printed = vsprintf(printf_buf, fmt, args);
	304	va_end(args);
	305
	306	puts(printf_buf);
	307
	308	return printed;
	309	}