[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>
/*cmd_boot.c*/
extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
#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>
8bde7f77	20	/cmd_boot.c/
54841ab5	21	extern int do_reset (cmd_tbl_t cmdtp, int flag, int argc, char const argv[]);
153d511e WD	22	#endif
153d511e WD	23
47910506	24	#include <div64.h>
6c6166f5	25	# define NUM_TYPE long long
47910506 DB	26	#define noinline __attribute__((noinline))
47910506 DB	27
6c6166f5 MF	28	const char hex_asc[] = "0123456789abcdef";
	29	#define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
	30	#define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]
	31
	32	static inline char pack_hex_byte(char buf, u8 byte)
	33	{
	34	*buf++ = hex_asc_hi(byte);
	35	*buf++ = hex_asc_lo(byte);
	36	return buf;
	37	}
	38
153d511e WD	39	unsigned long simple_strtoul(const char cp,char *endp,unsigned int base)
	40	{
	41	unsigned long result = 0,value;
	42
	43	if (*cp == '0') {
	44	cp++;
	45	if ((*cp == 'x') && isxdigit(cp[1])) {
	46	base = 16;
	47	cp++;
	48	}
	49	if (!base) {
	50	base = 8;
	51	}
	52	}
	53	if (!base) {
	54	base = 10;
	55	}
	56	while (isxdigit(cp) && (value = isdigit(cp) ? cp-'0' : (islower(cp)
	57	? toupper(cp) : cp)-'A'+10) < base) {
	58	result = result*base + value;
	59	cp++;
	60	}
	61	if (endp)
	62	endp = (char )cp;
	63	return result;
	64	}
	65
	66	long simple_strtol(const char cp,char *endp,unsigned int base)
	67	{
	68	if(*cp=='-')
	69	return -simple_strtoul(cp+1,endp,base);
	70	return simple_strtoul(cp,endp,base);
	71	}
	72
7e6ee7ad KP	73	int ustrtoul(const char cp, char *endp, unsigned int base)
	74	{
	75	unsigned long result = simple_strtoul(cp, endp, base);
	76	switch (**endp) {
	77	case 'G' :
	78	result *= 1024;
	79	/* fall through */
	80	case 'M':
	81	result *= 1024;
	82	/* fall through */
	83	case 'K':
	84	case 'k':
	85	result *= 1024;
	86	if ((*endp)[1] == 'i') {
	87	if ((*endp)[2] == 'B')
	88	(*endp) += 3;
	89	else
	90	(*endp) += 2;
	91	}
	92	}
	93	return result;
	94	}
	95
c40b2956 WD	96	unsigned long long simple_strtoull (const char cp, char *endp, unsigned int base)
	97	{
	98	unsigned long long result = 0, value;
	99
	100	if (*cp == '0') {
	101	cp++;
	102	if ((*cp == 'x') && isxdigit (cp[1])) {
	103	base = 16;
	104	cp++;
	105	}
	106	if (!base) {
	107	base = 8;
	108	}
	109	}
	110	if (!base) {
	111	base = 10;
	112	}
	113	while (isxdigit (cp) && (value = isdigit (cp)
	114	? *cp - '0'
	115	: (islower (cp) ? toupper (cp) : *cp) - 'A' + 10) < base) {
	116	result = result * base + value;
	117	cp++;
	118	}
	119	if (endp)
	120	endp = (char ) cp;
	121	return result;
	122	}
c40b2956	123
153d511e WD	124	/* we use this so that we can do without the ctype library */
	125	#define is_digit(c) ((c) >= '0' && (c) <= '9')
	126
	127	static int skip_atoi(const char **s)
	128	{
	129	int i=0;
	130
	131	while (is_digit(**s))
	132	i = i10 + ((*s)++) - '0';
	133	return i;
	134	}
	135
6c6166f5 MF	136	/* Decimal conversion is by far the most typical, and is used
	137	* for /proc and /sys data. This directly impacts e.g. top performance
	138	* with many processes running. We optimize it for speed
	139	* using code from
	140	* http://www.cs.uiowa.edu/~jones/bcd/decimal.html
	141	* (with permission from the author, Douglas W. Jones). */
	142
	143	/* Formats correctly any integer in [0,99999].
	144	* Outputs from one to five digits depending on input.
	145	* On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
	146	static char* put_dec_trunc(char *buf, unsigned q)
	147	{
	148	unsigned d3, d2, d1, d0;
	149	d1 = (q>>4) & 0xf;
	150	d2 = (q>>8) & 0xf;
	151	d3 = (q>>12);
	152
	153	d0 = 6*(d3 + d2 + d1) + (q & 0xf);
	154	q = (d0 * 0xcd) >> 11;
	155	d0 = d0 - 10*q;
	156	buf++ = d0 + '0'; / least significant digit */
	157	d1 = q + 9d3 + 5d2 + d1;
	158	if (d1 != 0) {
	159	q = (d1 * 0xcd) >> 11;
	160	d1 = d1 - 10*q;
	161	buf++ = d1 + '0'; / next digit */
	162
	163	d2 = q + 2*d2;
	164	if ((d2 != 0) \|\| (d3 != 0)) {
	165	q = (d2 * 0xd) >> 7;
	166	d2 = d2 - 10*q;
	167	buf++ = d2 + '0'; / next digit */
	168
	169	d3 = q + 4*d3;
	170	if (d3 != 0) {
	171	q = (d3 * 0xcd) >> 11;
	172	d3 = d3 - 10*q;
	173	buf++ = d3 + '0'; / next digit */
	174	if (q != 0)
	175	buf++ = q + '0'; / most sign. digit */
	176	}
	177	}
	178	}
	179	return buf;
	180	}
	181	/* Same with if's removed. Always emits five digits */
	182	static char* put_dec_full(char *buf, unsigned q)
	183	{
	184	/* BTW, if q is in [0,9999], 8-bit ints will be enough, */
	185	/* but anyway, gcc produces better code with full-sized ints */
	186	unsigned d3, d2, d1, d0;
	187	d1 = (q>>4) & 0xf;
	188	d2 = (q>>8) & 0xf;
	189	d3 = (q>>12);
	190
c0a14aed WD	191	/*
	192	* Possible ways to approx. divide by 10
	193	* gcc -O2 replaces multiply with shifts and adds
	194	* (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
	195	* (x * 0x67) >> 10: 1100111
	196	* (x * 0x34) >> 9: 110100 - same
	197	* (x * 0x1a) >> 8: 11010 - same
	198	* (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
	199	*/
6c6166f5 MF	200
	201	d0 = 6*(d3 + d2 + d1) + (q & 0xf);
	202	q = (d0 * 0xcd) >> 11;
	203	d0 = d0 - 10*q;
	204	*buf++ = d0 + '0';
	205	d1 = q + 9d3 + 5d2 + d1;
	206	q = (d1 * 0xcd) >> 11;
	207	d1 = d1 - 10*q;
	208	*buf++ = d1 + '0';
	209
	210	d2 = q + 2*d2;
	211	q = (d2 * 0xd) >> 7;
	212	d2 = d2 - 10*q;
	213	*buf++ = d2 + '0';
	214
	215	d3 = q + 4*d3;
	216	q = (d3 * 0xcd) >> 11; /* - shorter code */
	217	/* q = (d3 * 0x67) >> 10; - would also work */
	218	d3 = d3 - 10*q;
	219	*buf++ = d3 + '0';
	220	*buf++ = q + '0';
	221	return buf;
	222	}
	223	/* No inlining helps gcc to use registers better */
	224	static noinline char* put_dec(char *buf, unsigned NUM_TYPE num)
	225	{
	226	while (1) {
	227	unsigned rem;
	228	if (num < 100000)
	229	return put_dec_trunc(buf, num);
	230	rem = do_div(num, 100000);
	231	buf = put_dec_full(buf, rem);
	232	}
	233	}
	234
153d511e WD	235	#define ZEROPAD 1 /* pad with zero */
	236	#define SIGN 2 /* unsigned/signed long */
	237	#define PLUS 4 /* show plus */
	238	#define SPACE 8 /* space if plus */
	239	#define LEFT 16 /* left justified */
6c6166f5 MF	240	#define SMALL 32 /* Must be 32 == 0x20 */
6c6166f5 MF	241	#define SPECIAL 64 /* 0x */
153d511e	242
6c6166f5	243	static char number(char buf, unsigned NUM_TYPE num, int base, int size, int precision, int type)
153d511e	244	{
6c6166f5 MF	245	/* we are called with base 8, 10 or 16, only, thus don't need "G..." */
	246	static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
	247
	248	char tmp[66];
	249	char sign;
	250	char locase;
	251	int need_pfx = ((type & SPECIAL) && base != 10);
153d511e WD	252	int i;
153d511e WD	253
6c6166f5 MF	254	/* locase = 0 or 0x20. ORing digits or letters with 'locase'
	255	* produces same digits or (maybe lowercased) letters */
	256	locase = (type & SMALL);
153d511e WD	257	if (type & LEFT)
153d511e WD	258	type &= ~ZEROPAD;
153d511e WD	259	sign = 0;
153d511e WD	260	if (type & SIGN) {
6c6166f5	261	if ((signed NUM_TYPE) num < 0) {
153d511e	262	sign = '-';
6c6166f5	263	num = - (signed NUM_TYPE) num;
153d511e WD	264	size--;
	265	} else if (type & PLUS) {
	266	sign = '+';
	267	size--;
	268	} else if (type & SPACE) {
	269	sign = ' ';
	270	size--;
	271	}
	272	}
6c6166f5 MF	273	if (need_pfx) {
6c6166f5 MF	274	size--;
153d511e	275	if (base == 16)
153d511e WD	276	size--;
153d511e WD	277	}
6c6166f5 MF	278
6c6166f5 MF	279	/* generate full string in tmp[], in reverse order */
153d511e WD	280	i = 0;
153d511e WD	281	if (num == 0)
6c6166f5 MF	282	tmp[i++] = '0';
	283	/* Generic code, for any base:
	284	else do {
	285	tmp[i++] = (digits[do_div(num,base)] \| locase);
	286	} while (num != 0);
	287	*/
	288	else if (base != 10) { /* 8 or 16 */
	289	int mask = base - 1;
	290	int shift = 3;
	291	if (base == 16) shift = 4;
	292	do {
	293	tmp[i++] = (digits[((unsigned char)num) & mask] \| locase);
	294	num >>= shift;
	295	} while (num);
	296	} else { /* base 10 */
	297	i = put_dec(tmp, num) - tmp;
	298	}
	299
	300	/* printing 100 using %2d gives "100", not "00" */
153d511e WD	301	if (i > precision)
153d511e WD	302	precision = i;
6c6166f5	303	/* leading space padding */
153d511e	304	size -= precision;
6c6166f5 MF	305	if (!(type & (ZEROPAD+LEFT)))
	306	while(--size >= 0)
	307	*buf++ = ' ';
	308	/* sign */
153d511e	309	if (sign)
6c6166f5 MF	310	*buf++ = sign;
	311	/* "0x" / "0" prefix */
	312	if (need_pfx) {
	313	*buf++ = '0';
	314	if (base == 16)
	315	*buf++ = ('X' \| locase);
	316	}
	317	/* zero or space padding */
	318	if (!(type & LEFT)) {
	319	char c = (type & ZEROPAD) ? '0' : ' ';
	320	while (--size >= 0)
	321	*buf++ = c;
153d511e	322	}
6c6166f5 MF	323	/* hmm even more zero padding? */
	324	while (i <= --precision)
	325	*buf++ = '0';
	326	/* actual digits of result */
	327	while (--i >= 0)
	328	*buf++ = tmp[i];
	329	/* trailing space padding */
	330	while (--size >= 0)
	331	*buf++ = ' ';
	332	return buf;
153d511e WD	333	}
153d511e WD	334
6c6166f5 MF	335	static char string(char buf, char *s, int field_width, int precision, int flags)
	336	{
	337	int len, i;
153d511e	338
6c6166f5 MF	339	if (s == 0)
	340	s = "<NULL>";
	341
	342	len = strnlen(s, precision);
	343
	344	if (!(flags & LEFT))
	345	while (len < field_width--)
	346	*buf++ = ' ';
	347	for (i = 0; i < len; ++i)
	348	buf++ = s++;
	349	while (len < field_width--)
	350	*buf++ = ' ';
	351	return buf;
	352	}
	353
	354	#ifdef CONFIG_CMD_NET
	355	static char mac_address_string(char buf, u8 *addr, int field_width,
	356	int precision, int flags)
153d511e	357	{
6c6166f5 MF	358	char mac_addr[6 * 3]; /* (6 * 2 hex digits), 5 colons and trailing zero */
	359	char *p = mac_addr;
	360	int i;
	361
	362	for (i = 0; i < 6; i++) {
	363	p = pack_hex_byte(p, addr[i]);
	364	if (!(flags & SPECIAL) && i != 5)
	365	*p++ = ':';
	366	}
	367	*p = '\0';
	368
	369	return string(buf, mac_addr, field_width, precision, flags & ~SPECIAL);
	370	}
	371
	372	static char ip6_addr_string(char buf, u8 *addr, int field_width,
	373	int precision, int flags)
	374	{
	375	char ip6_addr[8 * 5]; /* (8 * 4 hex digits), 7 colons and trailing zero */
	376	char *p = ip6_addr;
	377	int i;
	378
	379	for (i = 0; i < 8; i++) {
	380	p = pack_hex_byte(p, addr[2 * i]);
	381	p = pack_hex_byte(p, addr[2 * i + 1]);
	382	if (!(flags & SPECIAL) && i != 7)
	383	*p++ = ':';
	384	}
	385	*p = '\0';
	386
	387	return string(buf, ip6_addr, field_width, precision, flags & ~SPECIAL);
	388	}
	389
	390	static char ip4_addr_string(char buf, u8 *addr, int field_width,
	391	int precision, int flags)
	392	{
	393	char ip4_addr[4 * 4]; /* (4 * 3 decimal digits), 3 dots and trailing zero */
	394	char temp[3]; /* hold each IP quad in reverse order */
	395	char *p = ip4_addr;
	396	int i, digits;
	397
	398	for (i = 0; i < 4; i++) {
	399	digits = put_dec_trunc(temp, addr[i]) - temp;
	400	/* reverse the digits in the quad */
	401	while (digits--)
	402	*p++ = temp[digits];
	403	if (i != 3)
	404	*p++ = '.';
	405	}
	406	*p = '\0';
	407
	408	return string(buf, ip4_addr, field_width, precision, flags & ~SPECIAL);
	409	}
c40b2956	410	#endif
6c6166f5 MF	411
	412	/*
	413	* Show a '%p' thing. A kernel extension is that the '%p' is followed
	414	* by an extra set of alphanumeric characters that are extended format
	415	* specifiers.
	416	*
	417	* Right now we handle:
	418	*
	419	* - 'M' For a 6-byte MAC address, it prints the address in the
	420	* usual colon-separated hex notation
	421	* - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
	422	* decimal for v4 and colon separated network-order 16 bit hex for v6)
	423	* - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
	424	* currently the same
	425	*
	426	* Note: The difference between 'S' and 'F' is that on ia64 and ppc64
	427	* function pointers are really function descriptors, which contain a
	428	* pointer to the real address.
	429	*/
	430	static char pointer(const char fmt, char buf, void ptr, int field_width, int precision, int flags)
	431	{
	432	if (!ptr)
	433	return string(buf, "(null)", field_width, precision, flags);
	434
	435	#ifdef CONFIG_CMD_NET
	436	switch (*fmt) {
	437	case 'm':
	438	flags \|= SPECIAL;
	439	/* Fallthrough */
	440	case 'M':
	441	return mac_address_string(buf, ptr, field_width, precision, flags);
	442	case 'i':
	443	flags \|= SPECIAL;
	444	/* Fallthrough */
	445	case 'I':
	446	if (fmt[1] == '6')
	447	return ip6_addr_string(buf, ptr, field_width, precision, flags);
	448	if (fmt[1] == '4')
	449	return ip4_addr_string(buf, ptr, field_width, precision, flags);
	450	flags &= ~SPECIAL;
	451	break;
	452	}
	453	#endif
	454	flags \|= SMALL;
	455	if (field_width == -1) {
	456	field_width = 2sizeof(void );
	457	flags \|= ZEROPAD;
	458	}
	459	return number(buf, (unsigned long) ptr, 16, field_width, precision, flags);
	460	}
	461
	462	/**
	463	* vsprintf - Format a string and place it in a buffer
	464	* @buf: The buffer to place the result into
	465	* @fmt: The format string to use
	466	* @args: Arguments for the format string
	467	*
	468	* This function follows C99 vsprintf, but has some extensions:
	469	* %pS output the name of a text symbol
	470	* %pF output the name of a function pointer
	471	* %pR output the address range in a struct resource
	472	*
	473	* The function returns the number of characters written
	474	* into @buf.
475	*
476	* Call this function if you are already dealing with a va_list.
477	* You probably want sprintf() instead.
478	*/
479	int vsprintf(char buf, const char fmt, va_list args)
480	{
481	unsigned NUM_TYPE num;
482	int base;
483	char *str;
153d511e WD	484
	485	int flags; /* flags to number() */
	486
	487	int field_width; /* width of output field */
	488	int precision; /* min. # of digits for integers; max
	489	number of chars for from string */
6c6166f5 MF	490	int qualifier; /* 'h', 'l', or 'L' for integer fields */
	491	/* 'z' support added 23/7/1999 S.H. */
	492	/* 'z' changed to 'Z' --davidm 1/25/99 */
	493	/* 't' added for ptrdiff_t */
	494
	495	str = buf;
153d511e	496
6c6166f5	497	for (; *fmt ; ++fmt) {
153d511e WD	498	if (*fmt != '%') {
	499	str++ = fmt;
	500	continue;
	501	}
	502
	503	/* process flags */
	504	flags = 0;
	505	repeat:
	506	++fmt; /* this also skips first '%' */
	507	switch (*fmt) {
	508	case '-': flags \|= LEFT; goto repeat;
	509	case '+': flags \|= PLUS; goto repeat;
	510	case ' ': flags \|= SPACE; goto repeat;
	511	case '#': flags \|= SPECIAL; goto repeat;
	512	case '0': flags \|= ZEROPAD; goto repeat;
6c6166f5	513	}
153d511e WD	514
	515	/* get field width */
	516	field_width = -1;
	517	if (is_digit(*fmt))
	518	field_width = skip_atoi(&fmt);
	519	else if (fmt == '') {
	520	++fmt;
	521	/* it's the next argument */
	522	field_width = va_arg(args, int);
	523	if (field_width < 0) {
	524	field_width = -field_width;
	525	flags \|= LEFT;
	526	}
	527	}
	528
	529	/* get the precision */
	530	precision = -1;
	531	if (*fmt == '.') {
	532	++fmt;
	533	if (is_digit(*fmt))
	534	precision = skip_atoi(&fmt);
	535	else if (fmt == '') {
	536	++fmt;
	537	/* it's the next argument */
	538	precision = va_arg(args, int);
	539	}
	540	if (precision < 0)
	541	precision = 0;
	542	}
	543
	544	/* get the conversion qualifier */
	545	qualifier = -1;
f354b73e	546	if (fmt == 'h' \|\| fmt == 'l' \|\| *fmt == 'L' \|\|
6c6166f5	547	fmt == 'Z' \|\| fmt == 'z' \|\| *fmt == 't') {
153d511e	548	qualifier = *fmt;
6c6166f5 MF	549	++fmt;
	550	if (qualifier == 'l' && *fmt == 'l') {
	551	qualifier = 'L';
bf052939 JY	552	++fmt;
bf052939 JY	553	}
153d511e WD	554	}
	555
	556	/* default base */
	557	base = 10;
	558
	559	switch (*fmt) {
	560	case 'c':
	561	if (!(flags & LEFT))
	562	while (--field_width > 0)
	563	*str++ = ' ';
	564	*str++ = (unsigned char) va_arg(args, int);
	565	while (--field_width > 0)
	566	*str++ = ' ';
	567	continue;
	568
	569	case 's':
6c6166f5	570	str = string(str, va_arg(args, char *), field_width, precision, flags);
153d511e WD	571	continue;
	572
	573	case 'p':
6c6166f5 MF	574	str = pointer(fmt+1, str,
	575	va_arg(args, void *),
	576	field_width, precision, flags);
	577	/* Skip all alphanumeric pointer suffixes */
	578	while (isalnum(fmt[1]))
	579	fmt++;
153d511e WD	580	continue;
153d511e WD	581
153d511e WD	582	case 'n':
	583	if (qualifier == 'l') {
	584	long * ip = va_arg(args, long *);
	585	*ip = (str - buf);
	586	} else {
	587	int * ip = va_arg(args, int *);
	588	*ip = (str - buf);
	589	}
	590	continue;
	591
	592	case '%':
	593	*str++ = '%';
	594	continue;
	595
	596	/* integer number formats - set up the flags and "break" */
	597	case 'o':
	598	base = 8;
	599	break;
	600
153d511e	601	case 'x':
6c6166f5 MF	602	flags \|= SMALL;
6c6166f5 MF	603	case 'X':
153d511e WD	604	base = 16;
	605	break;
	606
	607	case 'd':
	608	case 'i':
	609	flags \|= SIGN;
	610	case 'u':
	611	break;
	612
	613	default:
	614	*str++ = '%';
	615	if (*fmt)
	616	str++ = fmt;
	617	else
	618	--fmt;
	619	continue;
	620	}
6c6166f5	621	if (qualifier == 'L') /* "quad" for 64 bit variables */
c40b2956	622	num = va_arg(args, unsigned long long);
4b142feb	623	else if (qualifier == 'l') {
153d511e	624	num = va_arg(args, unsigned long);
6c6166f5 MF	625	if (flags & SIGN)
6c6166f5 MF	626	num = (signed long) num;
f354b73e JCPV	627	} else if (qualifier == 'Z' \|\| qualifier == 'z') {
	628	num = va_arg(args, size_t);
	629	} else if (qualifier == 't') {
	630	num = va_arg(args, ptrdiff_t);
	631	} else if (qualifier == 'h') {
153d511e WD	632	num = (unsigned short) va_arg(args, int);
153d511e WD	633	if (flags & SIGN)
6c6166f5 MF	634	num = (signed short) num;
6c6166f5 MF	635	} else {
153d511e	636	num = va_arg(args, unsigned int);
6c6166f5 MF	637	if (flags & SIGN)
	638	num = (signed int) num;
	639	}
153d511e WD	640	str = number(str, num, base, field_width, precision, flags);
	641	}
	642	*str = '\0';
	643	return str-buf;
	644	}
	645
6c6166f5 MF	646	/**
	647	* sprintf - Format a string and place it in a buffer
	648	* @buf: The buffer to place the result into
	649	* @fmt: The format string to use
	650	* @...: Arguments for the format string
	651	*
	652	* The function returns the number of characters written
	653	* into @buf.
	654	*
	655	* See the vsprintf() documentation for format string extensions over C99.
	656	*/
153d511e WD	657	int sprintf(char * buf, const char *fmt, ...)
	658	{
	659	va_list args;
	660	int i;
	661
	662	va_start(args, fmt);
	663	i=vsprintf(buf,fmt,args);
	664	va_end(args);
	665	return i;
	666	}
	667
	668	void panic(const char *fmt, ...)
	669	{
	670	va_list args;
	671	va_start(args, fmt);
6dd652fa	672	vprintf(fmt, args);
153d511e WD	673	putc('\n');
	674	va_end(args);
	675	#if defined (CONFIG_PANIC_HANG)
	676	hang();
	677	#else
	678	udelay (100000); /* allow messages to go out */
	679	do_reset (NULL, 0, 0, NULL);
	680	#endif
	681	}