[people/ms/u-boot.git] / lib / vsprintf.c

/*
 *  linux/lib/vsprintf.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 */

/* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
/*
 * Wirzenius wrote this portably, Torvalds fucked it up :-)
 */

#include <stdarg.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/ctype.h>

#include <common.h>
#if !defined (CONFIG_PANIC_HANG)
#include <command.h>
#endif

#include <div64.h>
# define NUM_TYPE long long
#define noinline __attribute__((noinline))

const char hex_asc[] = "0123456789abcdef";
#define hex_asc_lo(x)   hex_asc[((x) & 0x0f)]
#define hex_asc_hi(x)   hex_asc[((x) & 0xf0) >> 4]

static inline char *pack_hex_byte(char *buf, u8 byte)
{
	*buf++ = hex_asc_hi(byte);
	*buf++ = hex_asc_lo(byte);
	return buf;
}

unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base)
{
	unsigned long result = 0,value;

	if (*cp == '0') {
		cp++;
		if ((*cp == 'x') && isxdigit(cp[1])) {
			base = 16;
			cp++;
		}
		if (!base) {
			base = 8;
		}
	}
	if (!base) {
		base = 10;
	}
	while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
	    ? toupper(*cp) : *cp)-'A'+10) < base) {
		result = result*base + value;
		cp++;
	}
	if (endp)
		*endp = (char *)cp;
	return result;
}

long simple_strtol(const char *cp,char **endp,unsigned int base)
{
	if(*cp=='-')
		return -simple_strtoul(cp+1,endp,base);
	return simple_strtoul(cp,endp,base);
}

int ustrtoul(const char *cp, char **endp, unsigned int base)
{
	unsigned long result = simple_strtoul(cp, endp, base);
	switch (**endp) {
	case 'G' :
		result *= 1024;
		/* fall through */
	case 'M':
		result *= 1024;
		/* fall through */
	case 'K':
	case 'k':
		result *= 1024;
		if ((*endp)[1] == 'i') {
			if ((*endp)[2] == 'B')
				(*endp) += 3;
			else
				(*endp) += 2;
		}
	}
	return result;
}

unsigned long long simple_strtoull (const char *cp, char **endp, unsigned int base)
{
	unsigned long long result = 0, value;

	if (*cp == '0') {
		cp++;
		if ((*cp == 'x') && isxdigit (cp[1])) {
			base = 16;
			cp++;
		}
		if (!base) {
			base = 8;
		}
	}
	if (!base) {
		base = 10;
	}
	while (isxdigit (*cp) && (value = isdigit (*cp)
				? *cp - '0'
				: (islower (*cp) ? toupper (*cp) : *cp) - 'A' + 10) < base) {
		result = result * base + value;
		cp++;
	}
	if (endp)
		*endp = (char *) cp;
	return result;
}

/* we use this so that we can do without the ctype library */
#define is_digit(c)	((c) >= '0' && (c) <= '9')

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

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

/* Decimal conversion is by far the most typical, and is used
 * for /proc and /sys data. This directly impacts e.g. top performance
 * with many processes running. We optimize it for speed
 * using code from
 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
 * (with permission from the author, Douglas W. Jones). */

/* Formats correctly any integer in [0,99999].
 * Outputs from one to five digits depending on input.
 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
static char* put_dec_trunc(char *buf, unsigned q)
{
	unsigned d3, d2, d1, d0;
	d1 = (q>>4) & 0xf;
	d2 = (q>>8) & 0xf;
	d3 = (q>>12);

	d0 = 6*(d3 + d2 + d1) + (q & 0xf);
	q = (d0 * 0xcd) >> 11;
	d0 = d0 - 10*q;
	*buf++ = d0 + '0'; /* least significant digit */
	d1 = q + 9*d3 + 5*d2 + d1;
	if (d1 != 0) {
		q = (d1 * 0xcd) >> 11;
		d1 = d1 - 10*q;
		*buf++ = d1 + '0'; /* next digit */

		d2 = q + 2*d2;
		if ((d2 != 0) || (d3 != 0)) {
			q = (d2 * 0xd) >> 7;
			d2 = d2 - 10*q;
			*buf++ = d2 + '0'; /* next digit */

			d3 = q + 4*d3;
			if (d3 != 0) {
				q = (d3 * 0xcd) >> 11;
				d3 = d3 - 10*q;
				*buf++ = d3 + '0';  /* next digit */
				if (q != 0)
					*buf++ = q + '0';  /* most sign. digit */
			}
		}
	}
	return buf;
}
/* Same with if's removed. Always emits five digits */
static char* put_dec_full(char *buf, unsigned q)
{
	/* BTW, if q is in [0,9999], 8-bit ints will be enough, */
	/* but anyway, gcc produces better code with full-sized ints */
	unsigned d3, d2, d1, d0;
	d1 = (q>>4) & 0xf;
	d2 = (q>>8) & 0xf;
	d3 = (q>>12);

	/*
	 * Possible ways to approx. divide by 10
	 * gcc -O2 replaces multiply with shifts and adds
	 * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
	 * (x * 0x67) >> 10:  1100111
	 * (x * 0x34) >> 9:    110100 - same
	 * (x * 0x1a) >> 8:     11010 - same
	 * (x * 0x0d) >> 7:      1101 - same, shortest code (on i386)
	 */

	d0 = 6*(d3 + d2 + d1) + (q & 0xf);
	q = (d0 * 0xcd) >> 11;
	d0 = d0 - 10*q;
	*buf++ = d0 + '0';
	d1 = q + 9*d3 + 5*d2 + d1;
		q = (d1 * 0xcd) >> 11;
		d1 = d1 - 10*q;
		*buf++ = d1 + '0';

		d2 = q + 2*d2;
			q = (d2 * 0xd) >> 7;
			d2 = d2 - 10*q;
			*buf++ = d2 + '0';

			d3 = q + 4*d3;
				q = (d3 * 0xcd) >> 11; /* - shorter code */
				/* q = (d3 * 0x67) >> 10; - would also work */
				d3 = d3 - 10*q;
				*buf++ = d3 + '0';
					*buf++ = q + '0';
	return buf;
}
/* No inlining helps gcc to use registers better */
static noinline char* put_dec(char *buf, unsigned NUM_TYPE num)
{
	while (1) {
		unsigned rem;
		if (num < 100000)
			return put_dec_trunc(buf, num);
		rem = do_div(num, 100000);
		buf = put_dec_full(buf, rem);
	}
}

#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 */

static char *number(char *buf, unsigned NUM_TYPE 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 sign;
	char locase;
	int need_pfx = ((type & SPECIAL) && base != 10);
	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;
	sign = 0;
	if (type & SIGN) {
		if ((signed NUM_TYPE) num < 0) {
			sign = '-';
			num = - (signed NUM_TYPE) num;
			size--;
		} else if (type & PLUS) {
			sign = '+';
			size--;
		} else if (type & SPACE) {
			sign = ' ';
			size--;
		}
	}
	if (need_pfx) {
		size--;
		if (base == 16)
			size--;
	}

	/* generate full string in tmp[], in reverse order */
	i = 0;
	if (num == 0)
		tmp[i++] = '0';
	/* Generic code, for any base:
	else do {
		tmp[i++] = (digits[do_div(num,base)] | locase);
	} while (num != 0);
	*/
	else if (base != 10) { /* 8 or 16 */
		int mask = base - 1;
		int shift = 3;
		if (base == 16) shift = 4;
		do {
			tmp[i++] = (digits[((unsigned char)num) & mask] | locase);
			num >>= shift;
		} while (num);
	} else { /* base 10 */
		i = put_dec(tmp, num) - tmp;
	}

	/* printing 100 using %2d gives "100", not "00" */
	if (i > precision)
		precision = i;
	/* leading space padding */
	size -= precision;
	if (!(type & (ZEROPAD+LEFT)))
		while(--size >= 0)
			*buf++ = ' ';
	/* sign */
	if (sign)
		*buf++ = sign;
	/* "0x" / "0" prefix */
	if (need_pfx) {
		*buf++ = '0';
		if (base == 16)
			*buf++ = ('X' | locase);
	}
	/* zero or space padding */
	if (!(type & LEFT)) {
		char c = (type & ZEROPAD) ? '0' : ' ';
		while (--size >= 0)
			*buf++ = c;
	}
	/* hmm even more zero padding? */
	while (i <= --precision)
		*buf++ = '0';
	/* actual digits of result */
	while (--i >= 0)
		*buf++ = tmp[i];
	/* trailing space padding */
	while (--size >= 0)
		*buf++ = ' ';
	return buf;
}

static char *string(char *buf, char *s, int field_width, int precision, int flags)
{
	int len, i;

	if (s == 0)
		s = "<NULL>";

	len = strnlen(s, precision);

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

#ifdef CONFIG_CMD_NET
static char *mac_address_string(char *buf, u8 *addr, int field_width,
				int precision, int flags)
{
	char mac_addr[6 * 3]; /* (6 * 2 hex digits), 5 colons and trailing zero */
	char *p = mac_addr;
	int i;

	for (i = 0; i < 6; i++) {
		p = pack_hex_byte(p, addr[i]);
		if (!(flags & SPECIAL) && i != 5)
			*p++ = ':';
	}
	*p = '\0';

	return string(buf, mac_addr, field_width, precision, flags & ~SPECIAL);
}

static char *ip6_addr_string(char *buf, u8 *addr, int field_width,
			 int precision, int flags)
{
	char ip6_addr[8 * 5]; /* (8 * 4 hex digits), 7 colons and trailing zero */
	char *p = ip6_addr;
	int i;

	for (i = 0; i < 8; i++) {
		p = pack_hex_byte(p, addr[2 * i]);
		p = pack_hex_byte(p, addr[2 * i + 1]);
		if (!(flags & SPECIAL) && i != 7)
			*p++ = ':';
	}
	*p = '\0';

	return string(buf, ip6_addr, field_width, precision, flags & ~SPECIAL);
}

static char *ip4_addr_string(char *buf, u8 *addr, int field_width,
			 int precision, int flags)
{
	char ip4_addr[4 * 4]; /* (4 * 3 decimal digits), 3 dots and trailing zero */
	char temp[3];	/* hold each IP quad in reverse order */
	char *p = ip4_addr;
	int i, digits;

	for (i = 0; i < 4; i++) {
		digits = put_dec_trunc(temp, addr[i]) - temp;
		/* reverse the digits in the quad */
		while (digits--)
			*p++ = temp[digits];
		if (i != 3)
			*p++ = '.';
	}
	*p = '\0';

	return string(buf, ip4_addr, field_width, precision, flags & ~SPECIAL);
}
#endif

/*
 * Show a '%p' thing.  A kernel extension is that the '%p' is followed
 * by an extra set of alphanumeric characters that are extended format
 * specifiers.
 *
 * Right now we handle:
 *
 * - 'M' For a 6-byte MAC address, it prints the address in the
 *       usual colon-separated hex notation
 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
 *       decimal for v4 and colon separated network-order 16 bit hex for v6)
 * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
 *       currently the same
 *
 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
 * function pointers are really function descriptors, which contain a
 * pointer to the real address.
 */
static char *pointer(const char *fmt, char *buf, void *ptr, int field_width, int precision, int flags)
{
	if (!ptr)
		return string(buf, "(null)", field_width, precision, flags);

#ifdef CONFIG_CMD_NET
	switch (*fmt) {
	case 'm':
		flags |= SPECIAL;
		/* Fallthrough */
	case 'M':
		return mac_address_string(buf, ptr, field_width, precision, flags);
	case 'i':
		flags |= SPECIAL;
		/* Fallthrough */
	case 'I':
		if (fmt[1] == '6')
			return ip6_addr_string(buf, ptr, field_width, precision, flags);
		if (fmt[1] == '4')
			return ip4_addr_string(buf, ptr, field_width, precision, flags);
		flags &= ~SPECIAL;
		break;
	}
#endif
	flags |= SMALL;
	if (field_width == -1) {
		field_width = 2*sizeof(void *);
		flags |= ZEROPAD;
	}
	return number(buf, (unsigned long) ptr, 16, field_width, precision, flags);
}

/**
 * vsprintf - Format a string and place it in a buffer
 * @buf: The buffer to place the result into
 * @fmt: The format string to use
 * @args: Arguments for the format string
 *
 * This function follows C99 vsprintf, but has some extensions:
 * %pS output the name of a text symbol
 * %pF output the name of a function pointer
 * %pR output the address range in a struct resource
 *
 * The function returns the number of characters written
 * into @buf.
 *
 * Call this function if you are already dealing with a va_list.
 * You probably want sprintf() instead.
 */
int vsprintf(char *buf, const char *fmt, va_list args)
{
	unsigned NUM_TYPE num;
	int base;
	char *str;

	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 */
				/* 'z' support added 23/7/1999 S.H.    */
				/* 'z' changed to 'Z' --davidm 1/25/99 */
				/* 't' added for ptrdiff_t */

	str = buf;

	for (; *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 (is_digit(*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 (is_digit(*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' ||
		    *fmt == 'Z' || *fmt == 'z' || *fmt == 't') {
			qualifier = *fmt;
			++fmt;
			if (qualifier == 'l' && *fmt == 'l') {
				qualifier = 'L';
				++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':
			str = string(str, va_arg(args, char *), field_width, precision, flags);
			continue;

		case 'p':
			str = pointer(fmt+1, str,
					va_arg(args, void *),
					field_width, precision, flags);
			/* Skip all alphanumeric pointer suffixes */
			while (isalnum(fmt[1]))
				fmt++;
			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')  /* "quad" for 64 bit variables */
			num = va_arg(args, unsigned long long);
		else if (qualifier == 'l') {
			num = va_arg(args, unsigned long);
			if (flags & SIGN)
				num = (signed long) num;
		} else if (qualifier == 'Z' || qualifier == 'z') {
			num = va_arg(args, size_t);
		} else if (qualifier == 't') {
			num = va_arg(args, ptrdiff_t);
		} else if (qualifier == 'h') {
			num = (unsigned short) va_arg(args, int);
			if (flags & SIGN)
				num = (signed short) num;
		} else {
			num = va_arg(args, unsigned int);
			if (flags & SIGN)
				num = (signed int) num;
		}
		str = number(str, num, base, field_width, precision, flags);
	}
	*str = '\0';
	return str-buf;
}

/**
 * sprintf - Format a string and place it in a buffer
 * @buf: The buffer to place the result into
 * @fmt: The format string to use
 * @...: Arguments for the format string
 *
 * The function returns the number of characters written
 * into @buf.
 *
 * See the vsprintf() documentation for format string extensions over C99.
 */
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;
}

void panic(const char *fmt, ...)
{
	va_list	args;
	va_start(args, fmt);
	vprintf(fmt, args);
	putc('\n');
	va_end(args);
#if defined (CONFIG_PANIC_HANG)
	hang();
#else
	udelay (100000);	/* allow messages to go out */
	do_reset (NULL, 0, 0, NULL);
#endif
}
Commit	Line	Data
153d511e WD	1	/*
	2	* linux/lib/vsprintf.c
	3	*
	4	* Copyright (C) 1991, 1992 Linus Torvalds
	5	*/
	6
	7	/* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
	8	/*
	9	* Wirzenius wrote this portably, Torvalds fucked it up :-)
	10	*/
	11
	12	#include <stdarg.h>
	13	#include <linux/types.h>
	14	#include <linux/string.h>
	15	#include <linux/ctype.h>
	16
	17	#include <common.h>
	18	#if !defined (CONFIG_PANIC_HANG)
	19	#include <command.h>
153d511e WD	20	#endif
153d511e WD	21
47910506	22	#include <div64.h>
6c6166f5	23	# define NUM_TYPE long long
47910506 DB	24	#define noinline __attribute__((noinline))
47910506 DB	25
6c6166f5 MF	26	const char hex_asc[] = "0123456789abcdef";
	27	#define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
	28	#define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]
	29
	30	static inline char pack_hex_byte(char buf, u8 byte)
	31	{
	32	*buf++ = hex_asc_hi(byte);
	33	*buf++ = hex_asc_lo(byte);
	34	return buf;
	35	}
	36
153d511e WD	37	unsigned long simple_strtoul(const char cp,char *endp,unsigned int base)
	38	{
	39	unsigned long result = 0,value;
	40
	41	if (*cp == '0') {
	42	cp++;
	43	if ((*cp == 'x') && isxdigit(cp[1])) {
	44	base = 16;
	45	cp++;
	46	}
	47	if (!base) {
	48	base = 8;
	49	}
	50	}
	51	if (!base) {
	52	base = 10;
	53	}
	54	while (isxdigit(cp) && (value = isdigit(cp) ? cp-'0' : (islower(cp)
	55	? toupper(cp) : cp)-'A'+10) < base) {
	56	result = result*base + value;
	57	cp++;
	58	}
	59	if (endp)
	60	endp = (char )cp;
	61	return result;
	62	}
	63
	64	long simple_strtol(const char cp,char *endp,unsigned int base)
	65	{
	66	if(*cp=='-')
	67	return -simple_strtoul(cp+1,endp,base);
	68	return simple_strtoul(cp,endp,base);
	69	}
	70
7e6ee7ad KP	71	int ustrtoul(const char cp, char *endp, unsigned int base)
	72	{
	73	unsigned long result = simple_strtoul(cp, endp, base);
	74	switch (**endp) {
	75	case 'G' :
	76	result *= 1024;
	77	/* fall through */
	78	case 'M':
	79	result *= 1024;
	80	/* fall through */
	81	case 'K':
	82	case 'k':
	83	result *= 1024;
	84	if ((*endp)[1] == 'i') {
	85	if ((*endp)[2] == 'B')
	86	(*endp) += 3;
	87	else
	88	(*endp) += 2;
	89	}
	90	}
	91	return result;
	92	}
	93
c40b2956 WD	94	unsigned long long simple_strtoull (const char cp, char *endp, unsigned int base)
	95	{
	96	unsigned long long result = 0, value;
	97
	98	if (*cp == '0') {
	99	cp++;
	100	if ((*cp == 'x') && isxdigit (cp[1])) {
	101	base = 16;
	102	cp++;
	103	}
	104	if (!base) {
	105	base = 8;
	106	}
	107	}
	108	if (!base) {
	109	base = 10;
	110	}
	111	while (isxdigit (cp) && (value = isdigit (cp)
	112	? *cp - '0'
	113	: (islower (cp) ? toupper (cp) : *cp) - 'A' + 10) < base) {
	114	result = result * base + value;
	115	cp++;
	116	}
	117	if (endp)
	118	endp = (char ) cp;
	119	return result;
	120	}
c40b2956	121
153d511e WD	122	/* we use this so that we can do without the ctype library */
	123	#define is_digit(c) ((c) >= '0' && (c) <= '9')
	124
	125	static int skip_atoi(const char **s)
	126	{
	127	int i=0;
	128
	129	while (is_digit(**s))
	130	i = i10 + ((*s)++) - '0';
	131	return i;
	132	}
	133
6c6166f5 MF	134	/* Decimal conversion is by far the most typical, and is used
	135	* for /proc and /sys data. This directly impacts e.g. top performance
	136	* with many processes running. We optimize it for speed
	137	* using code from
	138	* http://www.cs.uiowa.edu/~jones/bcd/decimal.html
	139	* (with permission from the author, Douglas W. Jones). */
	140
	141	/* Formats correctly any integer in [0,99999].
	142	* Outputs from one to five digits depending on input.
	143	* On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
	144	static char* put_dec_trunc(char *buf, unsigned q)
	145	{
	146	unsigned d3, d2, d1, d0;
	147	d1 = (q>>4) & 0xf;
	148	d2 = (q>>8) & 0xf;
	149	d3 = (q>>12);
	150
	151	d0 = 6*(d3 + d2 + d1) + (q & 0xf);
	152	q = (d0 * 0xcd) >> 11;
	153	d0 = d0 - 10*q;
	154	buf++ = d0 + '0'; / least significant digit */
	155	d1 = q + 9d3 + 5d2 + d1;
	156	if (d1 != 0) {
	157	q = (d1 * 0xcd) >> 11;
	158	d1 = d1 - 10*q;
	159	buf++ = d1 + '0'; / next digit */
	160
	161	d2 = q + 2*d2;
	162	if ((d2 != 0) \|\| (d3 != 0)) {
	163	q = (d2 * 0xd) >> 7;
	164	d2 = d2 - 10*q;
	165	buf++ = d2 + '0'; / next digit */
	166
	167	d3 = q + 4*d3;
	168	if (d3 != 0) {
	169	q = (d3 * 0xcd) >> 11;
	170	d3 = d3 - 10*q;
	171	buf++ = d3 + '0'; / next digit */
	172	if (q != 0)
	173	buf++ = q + '0'; / most sign. digit */
	174	}
	175	}
	176	}
	177	return buf;
	178	}
	179	/* Same with if's removed. Always emits five digits */
	180	static char* put_dec_full(char *buf, unsigned q)
	181	{
	182	/* BTW, if q is in [0,9999], 8-bit ints will be enough, */
	183	/* but anyway, gcc produces better code with full-sized ints */
	184	unsigned d3, d2, d1, d0;
	185	d1 = (q>>4) & 0xf;
	186	d2 = (q>>8) & 0xf;
	187	d3 = (q>>12);
	188
c0a14aed WD	189	/*
	190	* Possible ways to approx. divide by 10
	191	* gcc -O2 replaces multiply with shifts and adds
	192	* (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
	193	* (x * 0x67) >> 10: 1100111
	194	* (x * 0x34) >> 9: 110100 - same
	195	* (x * 0x1a) >> 8: 11010 - same
	196	* (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
	197	*/
6c6166f5 MF	198
	199	d0 = 6*(d3 + d2 + d1) + (q & 0xf);
	200	q = (d0 * 0xcd) >> 11;
	201	d0 = d0 - 10*q;
	202	*buf++ = d0 + '0';
	203	d1 = q + 9d3 + 5d2 + d1;
	204	q = (d1 * 0xcd) >> 11;
	205	d1 = d1 - 10*q;
	206	*buf++ = d1 + '0';
	207
	208	d2 = q + 2*d2;
	209	q = (d2 * 0xd) >> 7;
	210	d2 = d2 - 10*q;
	211	*buf++ = d2 + '0';
	212
	213	d3 = q + 4*d3;
	214	q = (d3 * 0xcd) >> 11; /* - shorter code */
	215	/* q = (d3 * 0x67) >> 10; - would also work */
	216	d3 = d3 - 10*q;
	217	*buf++ = d3 + '0';
	218	*buf++ = q + '0';
	219	return buf;
	220	}
	221	/* No inlining helps gcc to use registers better */
	222	static noinline char* put_dec(char *buf, unsigned NUM_TYPE num)
	223	{
	224	while (1) {
	225	unsigned rem;
	226	if (num < 100000)
	227	return put_dec_trunc(buf, num);
	228	rem = do_div(num, 100000);
	229	buf = put_dec_full(buf, rem);
	230	}
	231	}
	232
153d511e WD	233	#define ZEROPAD 1 /* pad with zero */
	234	#define SIGN 2 /* unsigned/signed long */
	235	#define PLUS 4 /* show plus */
	236	#define SPACE 8 /* space if plus */
	237	#define LEFT 16 /* left justified */
6c6166f5 MF	238	#define SMALL 32 /* Must be 32 == 0x20 */
6c6166f5 MF	239	#define SPECIAL 64 /* 0x */
153d511e	240
6c6166f5	241	static char number(char buf, unsigned NUM_TYPE num, int base, int size, int precision, int type)
153d511e	242	{
6c6166f5 MF	243	/* we are called with base 8, 10 or 16, only, thus don't need "G..." */
	244	static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
	245
	246	char tmp[66];
	247	char sign;
	248	char locase;
	249	int need_pfx = ((type & SPECIAL) && base != 10);
153d511e WD	250	int i;
153d511e WD	251
6c6166f5 MF	252	/* locase = 0 or 0x20. ORing digits or letters with 'locase'
	253	* produces same digits or (maybe lowercased) letters */
	254	locase = (type & SMALL);
153d511e WD	255	if (type & LEFT)
153d511e WD	256	type &= ~ZEROPAD;
153d511e WD	257	sign = 0;
153d511e WD	258	if (type & SIGN) {
6c6166f5	259	if ((signed NUM_TYPE) num < 0) {
153d511e	260	sign = '-';
6c6166f5	261	num = - (signed NUM_TYPE) num;
153d511e WD	262	size--;
	263	} else if (type & PLUS) {
	264	sign = '+';
	265	size--;
	266	} else if (type & SPACE) {
	267	sign = ' ';
	268	size--;
	269	}
	270	}
6c6166f5 MF	271	if (need_pfx) {
6c6166f5 MF	272	size--;
153d511e	273	if (base == 16)
153d511e WD	274	size--;
153d511e WD	275	}
6c6166f5 MF	276
6c6166f5 MF	277	/* generate full string in tmp[], in reverse order */
153d511e WD	278	i = 0;
153d511e WD	279	if (num == 0)
6c6166f5 MF	280	tmp[i++] = '0';
	281	/* Generic code, for any base:
	282	else do {
	283	tmp[i++] = (digits[do_div(num,base)] \| locase);
	284	} while (num != 0);
	285	*/
	286	else if (base != 10) { /* 8 or 16 */
	287	int mask = base - 1;
	288	int shift = 3;
	289	if (base == 16) shift = 4;
	290	do {
	291	tmp[i++] = (digits[((unsigned char)num) & mask] \| locase);
	292	num >>= shift;
	293	} while (num);
	294	} else { /* base 10 */
	295	i = put_dec(tmp, num) - tmp;
	296	}
	297
	298	/* printing 100 using %2d gives "100", not "00" */
153d511e WD	299	if (i > precision)
153d511e WD	300	precision = i;
6c6166f5	301	/* leading space padding */
153d511e	302	size -= precision;
6c6166f5 MF	303	if (!(type & (ZEROPAD+LEFT)))
	304	while(--size >= 0)
	305	*buf++ = ' ';
	306	/* sign */
153d511e	307	if (sign)
6c6166f5 MF	308	*buf++ = sign;
	309	/* "0x" / "0" prefix */
	310	if (need_pfx) {
	311	*buf++ = '0';
	312	if (base == 16)
	313	*buf++ = ('X' \| locase);
	314	}
	315	/* zero or space padding */
	316	if (!(type & LEFT)) {
	317	char c = (type & ZEROPAD) ? '0' : ' ';
	318	while (--size >= 0)
	319	*buf++ = c;
153d511e	320	}
6c6166f5 MF	321	/* hmm even more zero padding? */
	322	while (i <= --precision)
	323	*buf++ = '0';
	324	/* actual digits of result */
	325	while (--i >= 0)
	326	*buf++ = tmp[i];
	327	/* trailing space padding */
	328	while (--size >= 0)
	329	*buf++ = ' ';
	330	return buf;
153d511e WD	331	}
153d511e WD	332
6c6166f5 MF	333	static char string(char buf, char *s, int field_width, int precision, int flags)
	334	{
	335	int len, i;
153d511e	336
6c6166f5 MF	337	if (s == 0)
	338	s = "<NULL>";
	339
	340	len = strnlen(s, precision);
	341
	342	if (!(flags & LEFT))
	343	while (len < field_width--)
	344	*buf++ = ' ';
	345	for (i = 0; i < len; ++i)
	346	buf++ = s++;
	347	while (len < field_width--)
	348	*buf++ = ' ';
	349	return buf;
	350	}
	351
	352	#ifdef CONFIG_CMD_NET
	353	static char mac_address_string(char buf, u8 *addr, int field_width,
	354	int precision, int flags)
153d511e	355	{
6c6166f5 MF	356	char mac_addr[6 * 3]; /* (6 * 2 hex digits), 5 colons and trailing zero */
	357	char *p = mac_addr;
	358	int i;
	359
	360	for (i = 0; i < 6; i++) {
	361	p = pack_hex_byte(p, addr[i]);
	362	if (!(flags & SPECIAL) && i != 5)
	363	*p++ = ':';
	364	}
	365	*p = '\0';
	366
	367	return string(buf, mac_addr, field_width, precision, flags & ~SPECIAL);
	368	}
	369
	370	static char ip6_addr_string(char buf, u8 *addr, int field_width,
	371	int precision, int flags)
	372	{
	373	char ip6_addr[8 * 5]; /* (8 * 4 hex digits), 7 colons and trailing zero */
	374	char *p = ip6_addr;
	375	int i;
	376
	377	for (i = 0; i < 8; i++) {
	378	p = pack_hex_byte(p, addr[2 * i]);
	379	p = pack_hex_byte(p, addr[2 * i + 1]);
	380	if (!(flags & SPECIAL) && i != 7)
	381	*p++ = ':';
	382	}
	383	*p = '\0';
	384
	385	return string(buf, ip6_addr, field_width, precision, flags & ~SPECIAL);
	386	}
	387
	388	static char ip4_addr_string(char buf, u8 *addr, int field_width,
	389	int precision, int flags)
	390	{
	391	char ip4_addr[4 * 4]; /* (4 * 3 decimal digits), 3 dots and trailing zero */
	392	char temp[3]; /* hold each IP quad in reverse order */
	393	char *p = ip4_addr;
	394	int i, digits;
	395
	396	for (i = 0; i < 4; i++) {
	397	digits = put_dec_trunc(temp, addr[i]) - temp;
	398	/* reverse the digits in the quad */
	399	while (digits--)
	400	*p++ = temp[digits];
	401	if (i != 3)
	402	*p++ = '.';
	403	}
	404	*p = '\0';
	405
	406	return string(buf, ip4_addr, field_width, precision, flags & ~SPECIAL);
	407	}
c40b2956	408	#endif
6c6166f5 MF	409
	410	/*
	411	* Show a '%p' thing. A kernel extension is that the '%p' is followed
	412	* by an extra set of alphanumeric characters that are extended format
	413	* specifiers.
	414	*
	415	* Right now we handle:
	416	*
	417	* - 'M' For a 6-byte MAC address, it prints the address in the
	418	* usual colon-separated hex notation
	419	* - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
	420	* decimal for v4 and colon separated network-order 16 bit hex for v6)
	421	* - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
	422	* currently the same
	423	*
	424	* Note: The difference between 'S' and 'F' is that on ia64 and ppc64
	425	* function pointers are really function descriptors, which contain a
	426	* pointer to the real address.
	427	*/
	428	static char pointer(const char fmt, char buf, void ptr, int field_width, int precision, int flags)
	429	{
	430	if (!ptr)
	431	return string(buf, "(null)", field_width, precision, flags);
	432
	433	#ifdef CONFIG_CMD_NET
	434	switch (*fmt) {
	435	case 'm':
	436	flags \|= SPECIAL;
	437	/* Fallthrough */
	438	case 'M':
	439	return mac_address_string(buf, ptr, field_width, precision, flags);
	440	case 'i':
	441	flags \|= SPECIAL;
	442	/* Fallthrough */
	443	case 'I':
	444	if (fmt[1] == '6')
	445	return ip6_addr_string(buf, ptr, field_width, precision, flags);
	446	if (fmt[1] == '4')
	447	return ip4_addr_string(buf, ptr, field_width, precision, flags);
	448	flags &= ~SPECIAL;
	449	break;
	450	}
	451	#endif
	452	flags \|= SMALL;
	453	if (field_width == -1) {
	454	field_width = 2sizeof(void );
	455	flags \|= ZEROPAD;
	456	}
	457	return number(buf, (unsigned long) ptr, 16, field_width, precision, flags);
	458	}
	459
	460	/**
	461	* vsprintf - Format a string and place it in a buffer
	462	* @buf: The buffer to place the result into
	463	* @fmt: The format string to use
	464	* @args: Arguments for the format string
	465	*
	466	* This function follows C99 vsprintf, but has some extensions:
	467	* %pS output the name of a text symbol
	468	* %pF output the name of a function pointer
	469	* %pR output the address range in a struct resource
	470	*
	471	* The function returns the number of characters written
	472	* into @buf.
473	*
474	* Call this function if you are already dealing with a va_list.
475	* You probably want sprintf() instead.
476	*/
477	int vsprintf(char buf, const char fmt, va_list args)
478	{
479	unsigned NUM_TYPE num;
480	int base;
481	char *str;
153d511e WD	482
	483	int flags; /* flags to number() */
	484
	485	int field_width; /* width of output field */
	486	int precision; /* min. # of digits for integers; max
	487	number of chars for from string */
6c6166f5 MF	488	int qualifier; /* 'h', 'l', or 'L' for integer fields */
	489	/* 'z' support added 23/7/1999 S.H. */
	490	/* 'z' changed to 'Z' --davidm 1/25/99 */
	491	/* 't' added for ptrdiff_t */
	492
	493	str = buf;
153d511e	494
6c6166f5	495	for (; *fmt ; ++fmt) {
153d511e WD	496	if (*fmt != '%') {
	497	str++ = fmt;
	498	continue;
	499	}
	500
	501	/* process flags */
	502	flags = 0;
	503	repeat:
	504	++fmt; /* this also skips first '%' */
	505	switch (*fmt) {
	506	case '-': flags \|= LEFT; goto repeat;
	507	case '+': flags \|= PLUS; goto repeat;
	508	case ' ': flags \|= SPACE; goto repeat;
	509	case '#': flags \|= SPECIAL; goto repeat;
	510	case '0': flags \|= ZEROPAD; goto repeat;
6c6166f5	511	}
153d511e WD	512
	513	/* get field width */
	514	field_width = -1;
	515	if (is_digit(*fmt))
	516	field_width = skip_atoi(&fmt);
	517	else if (fmt == '') {
	518	++fmt;
	519	/* it's the next argument */
	520	field_width = va_arg(args, int);
	521	if (field_width < 0) {
	522	field_width = -field_width;
	523	flags \|= LEFT;
	524	}
	525	}
	526
	527	/* get the precision */
	528	precision = -1;
	529	if (*fmt == '.') {
	530	++fmt;
	531	if (is_digit(*fmt))
	532	precision = skip_atoi(&fmt);
	533	else if (fmt == '') {
	534	++fmt;
	535	/* it's the next argument */
	536	precision = va_arg(args, int);
	537	}
	538	if (precision < 0)
	539	precision = 0;
	540	}
	541
	542	/* get the conversion qualifier */
	543	qualifier = -1;
f354b73e	544	if (fmt == 'h' \|\| fmt == 'l' \|\| *fmt == 'L' \|\|
6c6166f5	545	fmt == 'Z' \|\| fmt == 'z' \|\| *fmt == 't') {
153d511e	546	qualifier = *fmt;
6c6166f5 MF	547	++fmt;
	548	if (qualifier == 'l' && *fmt == 'l') {
	549	qualifier = 'L';
bf052939 JY	550	++fmt;
bf052939 JY	551	}
153d511e WD	552	}
	553
	554	/* default base */
	555	base = 10;
	556
	557	switch (*fmt) {
	558	case 'c':
	559	if (!(flags & LEFT))
	560	while (--field_width > 0)
	561	*str++ = ' ';
	562	*str++ = (unsigned char) va_arg(args, int);
	563	while (--field_width > 0)
	564	*str++ = ' ';
	565	continue;
	566
	567	case 's':
6c6166f5	568	str = string(str, va_arg(args, char *), field_width, precision, flags);
153d511e WD	569	continue;
	570
	571	case 'p':
6c6166f5 MF	572	str = pointer(fmt+1, str,
	573	va_arg(args, void *),
	574	field_width, precision, flags);
	575	/* Skip all alphanumeric pointer suffixes */
	576	while (isalnum(fmt[1]))
	577	fmt++;
153d511e WD	578	continue;
153d511e WD	579
153d511e WD	580	case 'n':
	581	if (qualifier == 'l') {
	582	long * ip = va_arg(args, long *);
	583	*ip = (str - buf);
	584	} else {
	585	int * ip = va_arg(args, int *);
	586	*ip = (str - buf);
	587	}
	588	continue;
	589
	590	case '%':
	591	*str++ = '%';
	592	continue;
	593
	594	/* integer number formats - set up the flags and "break" */
	595	case 'o':
	596	base = 8;
	597	break;
	598
153d511e	599	case 'x':
6c6166f5 MF	600	flags \|= SMALL;
6c6166f5 MF	601	case 'X':
153d511e WD	602	base = 16;
	603	break;
	604
	605	case 'd':
	606	case 'i':
	607	flags \|= SIGN;
	608	case 'u':
	609	break;
	610
	611	default:
	612	*str++ = '%';
	613	if (*fmt)
	614	str++ = fmt;
	615	else
	616	--fmt;
	617	continue;
	618	}
6c6166f5	619	if (qualifier == 'L') /* "quad" for 64 bit variables */
c40b2956	620	num = va_arg(args, unsigned long long);
4b142feb	621	else if (qualifier == 'l') {
153d511e	622	num = va_arg(args, unsigned long);
6c6166f5 MF	623	if (flags & SIGN)
6c6166f5 MF	624	num = (signed long) num;
f354b73e JCPV	625	} else if (qualifier == 'Z' \|\| qualifier == 'z') {
	626	num = va_arg(args, size_t);
	627	} else if (qualifier == 't') {
	628	num = va_arg(args, ptrdiff_t);
	629	} else if (qualifier == 'h') {
153d511e WD	630	num = (unsigned short) va_arg(args, int);
153d511e WD	631	if (flags & SIGN)
6c6166f5 MF	632	num = (signed short) num;
6c6166f5 MF	633	} else {
153d511e	634	num = va_arg(args, unsigned int);
6c6166f5 MF	635	if (flags & SIGN)
	636	num = (signed int) num;
	637	}
153d511e WD	638	str = number(str, num, base, field_width, precision, flags);
	639	}
	640	*str = '\0';
	641	return str-buf;
	642	}
	643
6c6166f5 MF	644	/**
	645	* sprintf - Format a string and place it in a buffer
	646	* @buf: The buffer to place the result into
	647	* @fmt: The format string to use
	648	* @...: Arguments for the format string
	649	*
	650	* The function returns the number of characters written
	651	* into @buf.
	652	*
	653	* See the vsprintf() documentation for format string extensions over C99.
	654	*/
153d511e WD	655	int sprintf(char * buf, const char *fmt, ...)
	656	{
	657	va_list args;
	658	int i;
	659
	660	va_start(args, fmt);
	661	i=vsprintf(buf,fmt,args);
	662	va_end(args);
	663	return i;
	664	}
	665
	666	void panic(const char *fmt, ...)
	667	{
	668	va_list args;
	669	va_start(args, fmt);
6dd652fa	670	vprintf(fmt, args);
153d511e WD	671	putc('\n');
	672	va_end(args);
	673	#if defined (CONFIG_PANIC_HANG)
	674	hang();
	675	#else
	676	udelay (100000); /* allow messages to go out */
	677	do_reset (NULL, 0, 0, NULL);
	678	#endif
	679	}