[mirror_ubuntu-bionic-kernel.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.
 *
 * ----------------------------------------------------------------------- */

/*
 * arch/i386/boot/printf.c
 *
 * 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 > 36)
		return 0;
	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	/*
	12	* arch/i386/boot/printf.c
	13	*
	14	* Oh, it's a waste of space, but oh-so-yummy for debugging. This
	15	* version of printf() does not include 64-bit support. "Live with
	16	* it."
	17	*
	18	*/
	19
	20	#include "boot.h"
	21
	22	static int skip_atoi(const char **s)
	23	{
	24	int i = 0;
	25
	26	while (isdigit(**s))
	27	i = i * 10 + ((s)++) - '0';
	28	return i;
	29	}
	30
	31	#define ZEROPAD 1 /* pad with zero */
	32	#define SIGN 2 /* unsigned/signed long */
	33	#define PLUS 4 /* show plus */
	34	#define SPACE 8 /* space if plus */
	35	#define LEFT 16 /* left justified */
9b706aee DV	36	#define SMALL 32 /* Must be 32 == 0x20 */
9b706aee DV	37	#define SPECIAL 64 /* 0x */
1543610a PA	38
	39	#define do_div(n,base) ({ \
	40	int __res; \
	41	__res = ((unsigned long) n) % (unsigned) base; \
	42	n = ((unsigned long) n) / (unsigned) base; \
	43	__res; })
	44
	45	static char number(char str, long num, int base, int size, int precision,
	46	int type)
	47	{
9b706aee DV	48	/* we are called with base 8, 10 or 16, only, thus don't need "G..." */
	49	static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
	50
	51	char tmp[66];
	52	char c, sign, locase;
1543610a PA	53	int i;
1543610a PA	54
9b706aee DV	55	/* locase = 0 or 0x20. ORing digits or letters with 'locase'
	56	* produces same digits or (maybe lowercased) letters */
	57	locase = (type & SMALL);
1543610a PA	58	if (type & LEFT)
	59	type &= ~ZEROPAD;
	60	if (base < 2 \|\| base > 36)
	61	return 0;
	62	c = (type & ZEROPAD) ? '0' : ' ';
	63	sign = 0;
	64	if (type & SIGN) {
	65	if (num < 0) {
	66	sign = '-';
	67	num = -num;
	68	size--;
	69	} else if (type & PLUS) {
	70	sign = '+';
	71	size--;
	72	} else if (type & SPACE) {
	73	sign = ' ';
	74	size--;
	75	}
	76	}
	77	if (type & SPECIAL) {
	78	if (base == 16)
	79	size -= 2;
	80	else if (base == 8)
	81	size--;
	82	}
	83	i = 0;
	84	if (num == 0)
	85	tmp[i++] = '0';
	86	else
	87	while (num != 0)
9b706aee	88	tmp[i++] = (digits[do_div(num, base)] \| locase);
1543610a PA	89	if (i > precision)
	90	precision = i;
	91	size -= precision;
	92	if (!(type & (ZEROPAD + LEFT)))
	93	while (size-- > 0)
	94	*str++ = ' ';
	95	if (sign)
	96	*str++ = sign;
	97	if (type & SPECIAL) {
	98	if (base == 8)
	99	*str++ = '0';
	100	else if (base == 16) {
	101	*str++ = '0';
9b706aee	102	*str++ = ('X' \| locase);
1543610a PA	103	}
	104	}
	105	if (!(type & LEFT))
	106	while (size-- > 0)
	107	*str++ = c;
	108	while (i < precision--)
	109	*str++ = '0';
	110	while (i-- > 0)
	111	*str++ = tmp[i];
	112	while (size-- > 0)
	113	*str++ = ' ';
	114	return str;
	115	}
	116
	117	int vsprintf(char buf, const char fmt, va_list args)
	118	{
	119	int len;
	120	unsigned long num;
	121	int i, base;
	122	char *str;
	123	const char *s;
	124
	125	int flags; /* flags to number() */
	126
	127	int field_width; /* width of output field */
	128	int precision; /* min. # of digits for integers; max
	129	number of chars for from string */
	130	int qualifier; /* 'h', 'l', or 'L' for integer fields */
	131
	132	for (str = buf; *fmt; ++fmt) {
	133	if (*fmt != '%') {
	134	str++ = fmt;
	135	continue;
	136	}
	137
	138	/* process flags */
	139	flags = 0;
	140	repeat:
	141	++fmt; /* this also skips first '%' */
	142	switch (*fmt) {
	143	case '-':
	144	flags \|= LEFT;
	145	goto repeat;
	146	case '+':
	147	flags \|= PLUS;
	148	goto repeat;
	149	case ' ':
	150	flags \|= SPACE;
	151	goto repeat;
	152	case '#':
	153	flags \|= SPECIAL;
	154	goto repeat;
	155	case '0':
	156	flags \|= ZEROPAD;
	157	goto repeat;
	158	}
	159
	160	/* get field width */
	161	field_width = -1;
	162	if (isdigit(*fmt))
	163	field_width = skip_atoi(&fmt);
	164	else if (fmt == '') {
	165	++fmt;
	166	/* it's the next argument */
167	field_width = va_arg(args, int);
168	if (field_width < 0) {
169	field_width = -field_width;
170	flags \|= LEFT;
171	}
172	}
173
174	/* get the precision */
175	precision = -1;
176	if (*fmt == '.') {
177	++fmt;
178	if (isdigit(*fmt))
179	precision = skip_atoi(&fmt);
180	else if (fmt == '') {
181	++fmt;
182	/* it's the next argument */
183	precision = va_arg(args, int);
184	}
185	if (precision < 0)
186	precision = 0;
187	}
188
189	/* get the conversion qualifier */
190	qualifier = -1;
191	if (fmt == 'h' \|\| fmt == 'l' \|\| *fmt == 'L') {
192	qualifier = *fmt;
193	++fmt;
194	}
195
196	/* default base */
197	base = 10;
198
199	switch (*fmt) {
200	case 'c':
201	if (!(flags & LEFT))
202	while (--field_width > 0)
203	*str++ = ' ';
204	*str++ = (unsigned char)va_arg(args, int);
205	while (--field_width > 0)
206	*str++ = ' ';
207	continue;
208
209	case 's':
210	s = va_arg(args, char *);
211	len = strnlen(s, precision);
212
213	if (!(flags & LEFT))
214	while (len < field_width--)
215	*str++ = ' ';
216	for (i = 0; i < len; ++i)
217	str++ = s++;
218	while (len < field_width--)
219	*str++ = ' ';
220	continue;
221
222	case 'p':
223	if (field_width == -1) {
224	field_width = 2 * sizeof(void *);
225	flags \|= ZEROPAD;
226	}
227	str = number(str,
228	(unsigned long)va_arg(args, void *), 16,
229	field_width, precision, flags);
230	continue;
231
232	case 'n':
233	if (qualifier == 'l') {
234	long ip = va_arg(args, long );
235	*ip = (str - buf);
236	} else {
237	int ip = va_arg(args, int );
238	*ip = (str - buf);
239	}
240	continue;
241
242	case '%':
243	*str++ = '%';
244	continue;
245
246	/* integer number formats - set up the flags and "break" */
247	case 'o':
248	base = 8;
249	break;
250
1543610a	251	case 'x':
9b706aee DV	252	flags \|= SMALL;
9b706aee DV	253	case 'X':
1543610a PA	254	base = 16;
	255	break;
	256
	257	case 'd':
	258	case 'i':
	259	flags \|= SIGN;
	260	case 'u':
	261	break;
	262
	263	default:
	264	*str++ = '%';
	265	if (*fmt)
	266	str++ = fmt;
	267	else
	268	--fmt;
	269	continue;
	270	}
	271	if (qualifier == 'l')
	272	num = va_arg(args, unsigned long);
	273	else if (qualifier == 'h') {
	274	num = (unsigned short)va_arg(args, int);
	275	if (flags & SIGN)
	276	num = (short)num;
	277	} else if (flags & SIGN)
	278	num = va_arg(args, int);
	279	else
	280	num = va_arg(args, unsigned int);
	281	str = number(str, num, base, field_width, precision, flags);
	282	}
	283	*str = '\0';
	284	return str - buf;
	285	}
	286
	287	int sprintf(char buf, const char fmt, ...)
	288	{
	289	va_list args;
	290	int i;
	291
	292	va_start(args, fmt);
	293	i = vsprintf(buf, fmt, args);
	294	va_end(args);
	295	return i;
	296	}
	297
	298	int printf(const char *fmt, ...)
	299	{
	300	char printf_buf[1024];
	301	va_list args;
	302	int printed;
	303
	304	va_start(args, fmt);
	305	printed = vsprintf(printf_buf, fmt, args);
	306	va_end(args);
	307
	308	puts(printf_buf);
	309
	310	return printed;
	311	}