[J-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 :-)
 *
 * from hush: simple_itoa() was lifted from boa-0.93.15
 */

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

/**
 * strict_strtoul - convert a string to an unsigned long strictly
 * @cp: The string to be converted
 * @base: The number base to use
 * @res: The converted result value
 *
 * strict_strtoul converts a string to an unsigned long only if the
 * string is really an unsigned long string, any string containing
 * any invalid char at the tail will be rejected and -EINVAL is returned,
 * only a newline char at the tail is acceptible because people generally
 * change a module parameter in the following way:
 *
 *      echo 1024 > /sys/module/e1000/parameters/copybreak
 *
 * echo will append a newline to the tail.
 *
 * It returns 0 if conversion is successful and *res is set to the converted
 * value, otherwise it returns -EINVAL and *res is set to 0.
 *
 * simple_strtoul just ignores the successive invalid characters and
 * return the converted value of prefix part of the string.
 *
 * Copied this function from Linux 2.6.38 commit ID:
 * 521cb40b0c44418a4fd36dc633f575813d59a43d
 *
 */
int strict_strtoul(const char *cp, unsigned int base, unsigned long *res)
{
	char *tail;
	unsigned long val;
	size_t len;

	*res = 0;
	len = strlen(cp);
	if (len == 0)
		return -EINVAL;

	val = simple_strtoul(cp, &tail, base);
	if (tail == cp)
		return -EINVAL;

	if ((*tail == '\0') ||
		((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
		*res = val;
		return 0;
	}

	return -EINVAL;
}

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
	while (1)
		;
}

void __assert_fail(const char *assertion, const char *file, unsigned line,
		   const char *function)
{
	/* This will not return */
	panic("%s:%u: %s: Assertion `%s' failed.", file, line, function,
	      assertion);
}

char *simple_itoa(ulong i)
{
	/* 21 digits plus null terminator, good for 64-bit or smaller ints */
	static char local[22];
	char *p = &local[21];

	*p-- = '\0';
	do {
		*p-- = '0' + i % 10;
		i /= 10;
	} while (i > 0);
	return p + 1;
}
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 :-)
3cce8a54 SG	10	*
3cce8a54 SG	11	* from hush: simple_itoa() was lifted from boa-0.93.15
153d511e WD	12	*/
	13
	14	#include <stdarg.h>
	15	#include <linux/types.h>
	16	#include <linux/string.h>
	17	#include <linux/ctype.h>
a7fd0d9f	18	#include <errno.h>
153d511e WD	19
	20	#include <common.h>
	21	#if !defined (CONFIG_PANIC_HANG)
	22	#include <command.h>
153d511e WD	23	#endif
153d511e WD	24
47910506	25	#include <div64.h>
6c6166f5	26	# define NUM_TYPE long long
47910506 DB	27	#define noinline __attribute__((noinline))
47910506 DB	28
6c6166f5 MF	29	const char hex_asc[] = "0123456789abcdef";
	30	#define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
	31	#define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]
	32
	33	static inline char pack_hex_byte(char buf, u8 byte)
	34	{
	35	*buf++ = hex_asc_hi(byte);
	36	*buf++ = hex_asc_lo(byte);
	37	return buf;
	38	}
	39
153d511e WD	40	unsigned long simple_strtoul(const char cp,char *endp,unsigned int base)
	41	{
	42	unsigned long result = 0,value;
	43
	44	if (*cp == '0') {
	45	cp++;
	46	if ((*cp == 'x') && isxdigit(cp[1])) {
	47	base = 16;
	48	cp++;
	49	}
	50	if (!base) {
	51	base = 8;
	52	}
	53	}
	54	if (!base) {
	55	base = 10;
	56	}
	57	while (isxdigit(cp) && (value = isdigit(cp) ? cp-'0' : (islower(cp)
	58	? toupper(cp) : cp)-'A'+10) < base) {
	59	result = result*base + value;
	60	cp++;
	61	}
	62	if (endp)
	63	endp = (char )cp;
	64	return result;
	65	}
	66
a7fd0d9f HS	67	/**
	68	* strict_strtoul - convert a string to an unsigned long strictly
	69	* @cp: The string to be converted
	70	* @base: The number base to use
	71	* @res: The converted result value
	72	*
	73	* strict_strtoul converts a string to an unsigned long only if the
	74	* string is really an unsigned long string, any string containing
	75	* any invalid char at the tail will be rejected and -EINVAL is returned,
	76	* only a newline char at the tail is acceptible because people generally
	77	* change a module parameter in the following way:
	78	*
	79	* echo 1024 > /sys/module/e1000/parameters/copybreak
	80	*
	81	* echo will append a newline to the tail.
	82	*
	83	* It returns 0 if conversion is successful and *res is set to the converted
	84	* value, otherwise it returns -EINVAL and *res is set to 0.
	85	*
	86	* simple_strtoul just ignores the successive invalid characters and
	87	* return the converted value of prefix part of the string.
	88	*
	89	* Copied this function from Linux 2.6.38 commit ID:
	90	* 521cb40b0c44418a4fd36dc633f575813d59a43d
	91	*
	92	*/
	93	int strict_strtoul(const char cp, unsigned int base, unsigned long res)
	94	{
	95	char *tail;
	96	unsigned long val;
	97	size_t len;
	98
	99	*res = 0;
	100	len = strlen(cp);
	101	if (len == 0)
	102	return -EINVAL;
	103
	104	val = simple_strtoul(cp, &tail, base);
	105	if (tail == cp)
	106	return -EINVAL;
	107
	108	if ((*tail == '\0') \|\|
	109	((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
	110	*res = val;
	111	return 0;
	112	}
	113
	114	return -EINVAL;
	115	}
	116
153d511e WD	117	long simple_strtol(const char cp,char *endp,unsigned int base)
	118	{
	119	if(*cp=='-')
	120	return -simple_strtoul(cp+1,endp,base);
	121	return simple_strtoul(cp,endp,base);
	122	}
	123
7e6ee7ad KP	124	int ustrtoul(const char cp, char *endp, unsigned int base)
	125	{
	126	unsigned long result = simple_strtoul(cp, endp, base);
	127	switch (**endp) {
	128	case 'G' :
	129	result *= 1024;
	130	/* fall through */
	131	case 'M':
	132	result *= 1024;
	133	/* fall through */
	134	case 'K':
	135	case 'k':
	136	result *= 1024;
	137	if ((*endp)[1] == 'i') {
	138	if ((*endp)[2] == 'B')
	139	(*endp) += 3;
	140	else
	141	(*endp) += 2;
	142	}
	143	}
	144	return result;
	145	}
	146
c40b2956 WD	147	unsigned long long simple_strtoull (const char cp, char *endp, unsigned int base)
	148	{
	149	unsigned long long result = 0, value;
	150
	151	if (*cp == '0') {
	152	cp++;
	153	if ((*cp == 'x') && isxdigit (cp[1])) {
	154	base = 16;
	155	cp++;
	156	}
	157	if (!base) {
	158	base = 8;
	159	}
	160	}
	161	if (!base) {
	162	base = 10;
	163	}
	164	while (isxdigit (cp) && (value = isdigit (cp)
	165	? *cp - '0'
	166	: (islower (cp) ? toupper (cp) : *cp) - 'A' + 10) < base) {
	167	result = result * base + value;
	168	cp++;
	169	}
	170	if (endp)
	171	endp = (char ) cp;
	172	return result;
	173	}
c40b2956	174
153d511e WD	175	/* we use this so that we can do without the ctype library */
	176	#define is_digit(c) ((c) >= '0' && (c) <= '9')
	177
	178	static int skip_atoi(const char **s)
	179	{
	180	int i=0;
	181
	182	while (is_digit(**s))
	183	i = i10 + ((*s)++) - '0';
	184	return i;
	185	}
	186
6c6166f5 MF	187	/* Decimal conversion is by far the most typical, and is used
	188	* for /proc and /sys data. This directly impacts e.g. top performance
	189	* with many processes running. We optimize it for speed
	190	* using code from
	191	* http://www.cs.uiowa.edu/~jones/bcd/decimal.html
	192	* (with permission from the author, Douglas W. Jones). */
	193
	194	/* Formats correctly any integer in [0,99999].
	195	* Outputs from one to five digits depending on input.
	196	* On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
	197	static char* put_dec_trunc(char *buf, unsigned q)
	198	{
	199	unsigned d3, d2, d1, d0;
	200	d1 = (q>>4) & 0xf;
	201	d2 = (q>>8) & 0xf;
	202	d3 = (q>>12);
	203
	204	d0 = 6*(d3 + d2 + d1) + (q & 0xf);
	205	q = (d0 * 0xcd) >> 11;
	206	d0 = d0 - 10*q;
	207	buf++ = d0 + '0'; / least significant digit */
	208	d1 = q + 9d3 + 5d2 + d1;
	209	if (d1 != 0) {
	210	q = (d1 * 0xcd) >> 11;
	211	d1 = d1 - 10*q;
	212	buf++ = d1 + '0'; / next digit */
	213
	214	d2 = q + 2*d2;
	215	if ((d2 != 0) \|\| (d3 != 0)) {
	216	q = (d2 * 0xd) >> 7;
	217	d2 = d2 - 10*q;
	218	buf++ = d2 + '0'; / next digit */
	219
	220	d3 = q + 4*d3;
	221	if (d3 != 0) {
	222	q = (d3 * 0xcd) >> 11;
	223	d3 = d3 - 10*q;
	224	buf++ = d3 + '0'; / next digit */
	225	if (q != 0)
	226	buf++ = q + '0'; / most sign. digit */
	227	}
	228	}
	229	}
	230	return buf;
	231	}
	232	/* Same with if's removed. Always emits five digits */
	233	static char* put_dec_full(char *buf, unsigned q)
	234	{
	235	/* BTW, if q is in [0,9999], 8-bit ints will be enough, */
	236	/* but anyway, gcc produces better code with full-sized ints */
	237	unsigned d3, d2, d1, d0;
	238	d1 = (q>>4) & 0xf;
	239	d2 = (q>>8) & 0xf;
	240	d3 = (q>>12);
	241
c0a14aed WD	242	/*
	243	* Possible ways to approx. divide by 10
	244	* gcc -O2 replaces multiply with shifts and adds
	245	* (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
	246	* (x * 0x67) >> 10: 1100111
	247	* (x * 0x34) >> 9: 110100 - same
	248	* (x * 0x1a) >> 8: 11010 - same
	249	* (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
	250	*/
6c6166f5 MF	251
	252	d0 = 6*(d3 + d2 + d1) + (q & 0xf);
	253	q = (d0 * 0xcd) >> 11;
	254	d0 = d0 - 10*q;
	255	*buf++ = d0 + '0';
	256	d1 = q + 9d3 + 5d2 + d1;
	257	q = (d1 * 0xcd) >> 11;
	258	d1 = d1 - 10*q;
	259	*buf++ = d1 + '0';
	260
	261	d2 = q + 2*d2;
	262	q = (d2 * 0xd) >> 7;
	263	d2 = d2 - 10*q;
	264	*buf++ = d2 + '0';
	265
	266	d3 = q + 4*d3;
	267	q = (d3 * 0xcd) >> 11; /* - shorter code */
	268	/* q = (d3 * 0x67) >> 10; - would also work */
	269	d3 = d3 - 10*q;
	270	*buf++ = d3 + '0';
	271	*buf++ = q + '0';
	272	return buf;
	273	}
	274	/* No inlining helps gcc to use registers better */
	275	static noinline char* put_dec(char *buf, unsigned NUM_TYPE num)
	276	{
	277	while (1) {
	278	unsigned rem;
	279	if (num < 100000)
	280	return put_dec_trunc(buf, num);
	281	rem = do_div(num, 100000);
	282	buf = put_dec_full(buf, rem);
	283	}
	284	}
	285
153d511e WD	286	#define ZEROPAD 1 /* pad with zero */
	287	#define SIGN 2 /* unsigned/signed long */
	288	#define PLUS 4 /* show plus */
	289	#define SPACE 8 /* space if plus */
	290	#define LEFT 16 /* left justified */
6c6166f5 MF	291	#define SMALL 32 /* Must be 32 == 0x20 */
6c6166f5 MF	292	#define SPECIAL 64 /* 0x */
153d511e	293
6c6166f5	294	static char number(char buf, unsigned NUM_TYPE num, int base, int size, int precision, int type)
153d511e	295	{
6c6166f5 MF	296	/* we are called with base 8, 10 or 16, only, thus don't need "G..." */
	297	static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
	298
	299	char tmp[66];
	300	char sign;
	301	char locase;
	302	int need_pfx = ((type & SPECIAL) && base != 10);
153d511e WD	303	int i;
153d511e WD	304
6c6166f5 MF	305	/* locase = 0 or 0x20. ORing digits or letters with 'locase'
	306	* produces same digits or (maybe lowercased) letters */
	307	locase = (type & SMALL);
153d511e WD	308	if (type & LEFT)
153d511e WD	309	type &= ~ZEROPAD;
153d511e WD	310	sign = 0;
153d511e WD	311	if (type & SIGN) {
6c6166f5	312	if ((signed NUM_TYPE) num < 0) {
153d511e	313	sign = '-';
6c6166f5	314	num = - (signed NUM_TYPE) num;
153d511e WD	315	size--;
	316	} else if (type & PLUS) {
	317	sign = '+';
	318	size--;
	319	} else if (type & SPACE) {
	320	sign = ' ';
	321	size--;
	322	}
	323	}
6c6166f5 MF	324	if (need_pfx) {
6c6166f5 MF	325	size--;
153d511e	326	if (base == 16)
153d511e WD	327	size--;
153d511e WD	328	}
6c6166f5 MF	329
6c6166f5 MF	330	/* generate full string in tmp[], in reverse order */
153d511e WD	331	i = 0;
153d511e WD	332	if (num == 0)
6c6166f5 MF	333	tmp[i++] = '0';
	334	/* Generic code, for any base:
	335	else do {
	336	tmp[i++] = (digits[do_div(num,base)] \| locase);
	337	} while (num != 0);
	338	*/
	339	else if (base != 10) { /* 8 or 16 */
	340	int mask = base - 1;
	341	int shift = 3;
	342	if (base == 16) shift = 4;
	343	do {
	344	tmp[i++] = (digits[((unsigned char)num) & mask] \| locase);
	345	num >>= shift;
	346	} while (num);
	347	} else { /* base 10 */
	348	i = put_dec(tmp, num) - tmp;
	349	}
	350
	351	/* printing 100 using %2d gives "100", not "00" */
153d511e WD	352	if (i > precision)
153d511e WD	353	precision = i;
6c6166f5	354	/* leading space padding */
153d511e	355	size -= precision;
6c6166f5 MF	356	if (!(type & (ZEROPAD+LEFT)))
	357	while(--size >= 0)
	358	*buf++ = ' ';
	359	/* sign */
153d511e	360	if (sign)
6c6166f5 MF	361	*buf++ = sign;
	362	/* "0x" / "0" prefix */
	363	if (need_pfx) {
	364	*buf++ = '0';
	365	if (base == 16)
	366	*buf++ = ('X' \| locase);
	367	}
	368	/* zero or space padding */
	369	if (!(type & LEFT)) {
	370	char c = (type & ZEROPAD) ? '0' : ' ';
	371	while (--size >= 0)
	372	*buf++ = c;
153d511e	373	}
6c6166f5 MF	374	/* hmm even more zero padding? */
	375	while (i <= --precision)
	376	*buf++ = '0';
	377	/* actual digits of result */
	378	while (--i >= 0)
	379	*buf++ = tmp[i];
	380	/* trailing space padding */
	381	while (--size >= 0)
	382	*buf++ = ' ';
	383	return buf;
153d511e WD	384	}
153d511e WD	385
6c6166f5 MF	386	static char string(char buf, char *s, int field_width, int precision, int flags)
	387	{
	388	int len, i;
153d511e	389
6c6166f5 MF	390	if (s == 0)
	391	s = "<NULL>";
	392
	393	len = strnlen(s, precision);
	394
	395	if (!(flags & LEFT))
	396	while (len < field_width--)
	397	*buf++ = ' ';
	398	for (i = 0; i < len; ++i)
	399	buf++ = s++;
	400	while (len < field_width--)
	401	*buf++ = ' ';
	402	return buf;
	403	}
	404
	405	#ifdef CONFIG_CMD_NET
	406	static char mac_address_string(char buf, u8 *addr, int field_width,
	407	int precision, int flags)
153d511e	408	{
6c6166f5 MF	409	char mac_addr[6 * 3]; /* (6 * 2 hex digits), 5 colons and trailing zero */
	410	char *p = mac_addr;
	411	int i;
	412
	413	for (i = 0; i < 6; i++) {
	414	p = pack_hex_byte(p, addr[i]);
	415	if (!(flags & SPECIAL) && i != 5)
	416	*p++ = ':';
	417	}
	418	*p = '\0';
	419
	420	return string(buf, mac_addr, field_width, precision, flags & ~SPECIAL);
	421	}
	422
	423	static char ip6_addr_string(char buf, u8 *addr, int field_width,
	424	int precision, int flags)
	425	{
	426	char ip6_addr[8 * 5]; /* (8 * 4 hex digits), 7 colons and trailing zero */
	427	char *p = ip6_addr;
	428	int i;
	429
	430	for (i = 0; i < 8; i++) {
	431	p = pack_hex_byte(p, addr[2 * i]);
	432	p = pack_hex_byte(p, addr[2 * i + 1]);
	433	if (!(flags & SPECIAL) && i != 7)
	434	*p++ = ':';
	435	}
	436	*p = '\0';
	437
	438	return string(buf, ip6_addr, field_width, precision, flags & ~SPECIAL);
	439	}
	440
	441	static char ip4_addr_string(char buf, u8 *addr, int field_width,
	442	int precision, int flags)
	443	{
	444	char ip4_addr[4 * 4]; /* (4 * 3 decimal digits), 3 dots and trailing zero */
	445	char temp[3]; /* hold each IP quad in reverse order */
	446	char *p = ip4_addr;
	447	int i, digits;
	448
	449	for (i = 0; i < 4; i++) {
	450	digits = put_dec_trunc(temp, addr[i]) - temp;
	451	/* reverse the digits in the quad */
	452	while (digits--)
	453	*p++ = temp[digits];
	454	if (i != 3)
	455	*p++ = '.';
	456	}
	457	*p = '\0';
	458
	459	return string(buf, ip4_addr, field_width, precision, flags & ~SPECIAL);
	460	}
c40b2956	461	#endif
6c6166f5 MF	462
	463	/*
	464	* Show a '%p' thing. A kernel extension is that the '%p' is followed
	465	* by an extra set of alphanumeric characters that are extended format
	466	* specifiers.
	467	*
	468	* Right now we handle:
	469	*
	470	* - 'M' For a 6-byte MAC address, it prints the address in the
	471	* usual colon-separated hex notation
	472	* - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
	473	* decimal for v4 and colon separated network-order 16 bit hex for v6)
	474	* - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
	475	* currently the same
	476	*
	477	* Note: The difference between 'S' and 'F' is that on ia64 and ppc64
	478	* function pointers are really function descriptors, which contain a
	479	* pointer to the real address.
	480	*/
	481	static char pointer(const char fmt, char buf, void ptr, int field_width, int precision, int flags)
	482	{
	483	if (!ptr)
	484	return string(buf, "(null)", field_width, precision, flags);
	485
	486	#ifdef CONFIG_CMD_NET
	487	switch (*fmt) {
	488	case 'm':
	489	flags \|= SPECIAL;
	490	/* Fallthrough */
	491	case 'M':
	492	return mac_address_string(buf, ptr, field_width, precision, flags);
	493	case 'i':
	494	flags \|= SPECIAL;
	495	/* Fallthrough */
	496	case 'I':
	497	if (fmt[1] == '6')
	498	return ip6_addr_string(buf, ptr, field_width, precision, flags);
	499	if (fmt[1] == '4')
	500	return ip4_addr_string(buf, ptr, field_width, precision, flags);
	501	flags &= ~SPECIAL;
	502	break;
	503	}
	504	#endif
	505	flags \|= SMALL;
	506	if (field_width == -1) {
	507	field_width = 2sizeof(void );
	508	flags \|= ZEROPAD;
	509	}
	510	return number(buf, (unsigned long) ptr, 16, field_width, precision, flags);
	511	}
	512
	513	/**
	514	* vsprintf - Format a string and place it in a buffer
	515	* @buf: The buffer to place the result into
	516	* @fmt: The format string to use
	517	* @args: Arguments for the format string
	518	*
	519	* This function follows C99 vsprintf, but has some extensions:
	520	* %pS output the name of a text symbol
	521	* %pF output the name of a function pointer
	522	* %pR output the address range in a struct resource
	523	*
	524	* The function returns the number of characters written
	525	* into @buf.
526	*
527	* Call this function if you are already dealing with a va_list.
528	* You probably want sprintf() instead.
529	*/
530	int vsprintf(char buf, const char fmt, va_list args)
531	{
532	unsigned NUM_TYPE num;
533	int base;
534	char *str;
153d511e WD	535
	536	int flags; /* flags to number() */
	537
	538	int field_width; /* width of output field */
	539	int precision; /* min. # of digits for integers; max
	540	number of chars for from string */
6c6166f5 MF	541	int qualifier; /* 'h', 'l', or 'L' for integer fields */
	542	/* 'z' support added 23/7/1999 S.H. */
	543	/* 'z' changed to 'Z' --davidm 1/25/99 */
	544	/* 't' added for ptrdiff_t */
	545
	546	str = buf;
153d511e	547
6c6166f5	548	for (; *fmt ; ++fmt) {
153d511e WD	549	if (*fmt != '%') {
	550	str++ = fmt;
	551	continue;
	552	}
	553
	554	/* process flags */
	555	flags = 0;
	556	repeat:
	557	++fmt; /* this also skips first '%' */
	558	switch (*fmt) {
	559	case '-': flags \|= LEFT; goto repeat;
	560	case '+': flags \|= PLUS; goto repeat;
	561	case ' ': flags \|= SPACE; goto repeat;
	562	case '#': flags \|= SPECIAL; goto repeat;
	563	case '0': flags \|= ZEROPAD; goto repeat;
6c6166f5	564	}
153d511e WD	565
	566	/* get field width */
	567	field_width = -1;
	568	if (is_digit(*fmt))
	569	field_width = skip_atoi(&fmt);
	570	else if (fmt == '') {
	571	++fmt;
	572	/* it's the next argument */
	573	field_width = va_arg(args, int);
	574	if (field_width < 0) {
	575	field_width = -field_width;
	576	flags \|= LEFT;
	577	}
	578	}
	579
	580	/* get the precision */
	581	precision = -1;
	582	if (*fmt == '.') {
	583	++fmt;
	584	if (is_digit(*fmt))
	585	precision = skip_atoi(&fmt);
	586	else if (fmt == '') {
	587	++fmt;
	588	/* it's the next argument */
	589	precision = va_arg(args, int);
	590	}
	591	if (precision < 0)
	592	precision = 0;
	593	}
	594
	595	/* get the conversion qualifier */
	596	qualifier = -1;
f354b73e	597	if (fmt == 'h' \|\| fmt == 'l' \|\| *fmt == 'L' \|\|
6c6166f5	598	fmt == 'Z' \|\| fmt == 'z' \|\| *fmt == 't') {
153d511e	599	qualifier = *fmt;
6c6166f5 MF	600	++fmt;
	601	if (qualifier == 'l' && *fmt == 'l') {
	602	qualifier = 'L';
bf052939 JY	603	++fmt;
bf052939 JY	604	}
153d511e WD	605	}
	606
	607	/* default base */
	608	base = 10;
	609
	610	switch (*fmt) {
	611	case 'c':
	612	if (!(flags & LEFT))
	613	while (--field_width > 0)
	614	*str++ = ' ';
	615	*str++ = (unsigned char) va_arg(args, int);
	616	while (--field_width > 0)
	617	*str++ = ' ';
	618	continue;
	619
	620	case 's':
6c6166f5	621	str = string(str, va_arg(args, char *), field_width, precision, flags);
153d511e WD	622	continue;
	623
	624	case 'p':
6c6166f5 MF	625	str = pointer(fmt+1, str,
	626	va_arg(args, void *),
	627	field_width, precision, flags);
	628	/* Skip all alphanumeric pointer suffixes */
	629	while (isalnum(fmt[1]))
	630	fmt++;
153d511e WD	631	continue;
153d511e WD	632
153d511e WD	633	case 'n':
	634	if (qualifier == 'l') {
	635	long * ip = va_arg(args, long *);
	636	*ip = (str - buf);
	637	} else {
	638	int * ip = va_arg(args, int *);
	639	*ip = (str - buf);
	640	}
	641	continue;
	642
	643	case '%':
	644	*str++ = '%';
	645	continue;
	646
	647	/* integer number formats - set up the flags and "break" */
	648	case 'o':
	649	base = 8;
	650	break;
	651
153d511e	652	case 'x':
6c6166f5 MF	653	flags \|= SMALL;
6c6166f5 MF	654	case 'X':
153d511e WD	655	base = 16;
	656	break;
	657
	658	case 'd':
	659	case 'i':
	660	flags \|= SIGN;
	661	case 'u':
	662	break;
	663
	664	default:
	665	*str++ = '%';
	666	if (*fmt)
	667	str++ = fmt;
	668	else
	669	--fmt;
	670	continue;
	671	}
6c6166f5	672	if (qualifier == 'L') /* "quad" for 64 bit variables */
c40b2956	673	num = va_arg(args, unsigned long long);
4b142feb	674	else if (qualifier == 'l') {
153d511e	675	num = va_arg(args, unsigned long);
6c6166f5 MF	676	if (flags & SIGN)
6c6166f5 MF	677	num = (signed long) num;
f354b73e JCPV	678	} else if (qualifier == 'Z' \|\| qualifier == 'z') {
	679	num = va_arg(args, size_t);
	680	} else if (qualifier == 't') {
	681	num = va_arg(args, ptrdiff_t);
	682	} else if (qualifier == 'h') {
153d511e WD	683	num = (unsigned short) va_arg(args, int);
153d511e WD	684	if (flags & SIGN)
6c6166f5 MF	685	num = (signed short) num;
6c6166f5 MF	686	} else {
153d511e	687	num = va_arg(args, unsigned int);
6c6166f5 MF	688	if (flags & SIGN)
	689	num = (signed int) num;
	690	}
153d511e WD	691	str = number(str, num, base, field_width, precision, flags);
	692	}
	693	*str = '\0';
	694	return str-buf;
	695	}
	696
6c6166f5 MF	697	/**
	698	* sprintf - Format a string and place it in a buffer
	699	* @buf: The buffer to place the result into
	700	* @fmt: The format string to use
	701	* @...: Arguments for the format string
	702	*
	703	* The function returns the number of characters written
	704	* into @buf.
	705	*
	706	* See the vsprintf() documentation for format string extensions over C99.
	707	*/
153d511e WD	708	int sprintf(char * buf, const char *fmt, ...)
	709	{
	710	va_list args;
	711	int i;
	712
	713	va_start(args, fmt);
	714	i=vsprintf(buf,fmt,args);
	715	va_end(args);
	716	return i;
	717	}
	718
	719	void panic(const char *fmt, ...)
	720	{
	721	va_list args;
	722	va_start(args, fmt);
6dd652fa	723	vprintf(fmt, args);
153d511e WD	724	putc('\n');
	725	va_end(args);
	726	#if defined (CONFIG_PANIC_HANG)
	727	hang();
	728	#else
	729	udelay (100000); /* allow messages to go out */
	730	do_reset (NULL, 0, 0, NULL);
	731	#endif
40e01881 HS	732	while (1)
40e01881 HS	733	;
153d511e	734	}
21726a7a SG	735
	736	void __assert_fail(const char assertion, const char file, unsigned line,
	737	const char *function)
	738	{
	739	/* This will not return */
	740	panic("%s:%u: %s: Assertion `%s' failed.", file, line, function,
	741	assertion);
	742	}
3cce8a54 SG	743
	744	char *simple_itoa(ulong i)
	745	{
	746	/* 21 digits plus null terminator, good for 64-bit or smaller ints */
	747	static char local[22];
	748	char *p = &local[21];
	749
	750	*p-- = '\0';
	751	do {
	752	*p-- = '0' + i % 10;
	753	i /= 10;
	754	} while (i > 0);
	755	return p + 1;
	756	}