/*
   *  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 <common.h>

  #include <charset.h>

  #include <efi_loader.h>
  #include <div64.h>

  #include <hexdump.h>

  #include <uuid.h>

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

  #define noinline __attribute__((noinline))

  /* 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, uint64_t 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 */

  /*
   * Macro to add a new character to our output string, but only if it will
   * fit. The macro moves to the next character position in the output string.
   */
  #define ADDCH(str, ch) do { \
  	if ((str) < end) \
  		*(str) = (ch); \
  	++str; \
  	} while (0)

  static char *number(char *buf, char *end, u64 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";

  
  	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 ((s64) num < 0) {

  			sign = '-';

  			num = -(s64) 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)
  			ADDCH(buf, ' ');
  	}

  	/* sign */

  	if (sign)

  		ADDCH(buf, sign);

  	/* "0x" / "0" prefix */
  	if (need_pfx) {

  		ADDCH(buf, '0');

  		if (base == 16)

  			ADDCH(buf, 'X' | locase);

  	}
  	/* zero or space padding */
  	if (!(type & LEFT)) {
  		char c = (type & ZEROPAD) ? '0' : ' ';

  		while (--size >= 0)

  			ADDCH(buf, c);

  	}

  	/* hmm even more zero padding? */
  	while (i <= --precision)

  		ADDCH(buf, '0');

  	/* actual digits of result */
  	while (--i >= 0)

  		ADDCH(buf, tmp[i]);

  	/* trailing space padding */
  	while (--size >= 0)

  		ADDCH(buf, ' ');

  	return buf;

  }

  static char *string(char *buf, char *end, char *s, int field_width,
  		int precision, int flags)

  {
  	int len, i;

  	if (s == NULL)

  		s = "<NULL>";
  
  	len = strnlen(s, precision);
  
  	if (!(flags & LEFT))
  		while (len < field_width--)

  			ADDCH(buf, ' ');

  	for (i = 0; i < len; ++i)

  		ADDCH(buf, *s++);

  	while (len < field_width--)

  		ADDCH(buf, ' ');

  	return buf;
  }

  /* U-Boot uses UTF-16 strings in the EFI context only. */
  #if CONFIG_IS_ENABLED(EFI_LOADER) && !defined(API_BUILD)

  static char *string16(char *buf, char *end, u16 *s, int field_width,
  		int precision, int flags)
  {

  	const u16 *str = s ? s : L"<NULL>";
  	ssize_t i, len = utf16_strnlen(str, precision);

  
  	if (!(flags & LEFT))

  		for (; len < field_width; --field_width)

  			ADDCH(buf, ' ');

  	for (i = 0; i < len && buf + utf16_utf8_strnlen(str, 1) <= end; ++i) {
  		s32 s = utf16_get(&str);

  		if (s < 0)
  			s = '?';

  		utf8_put(s, &buf);
  	}

  	for (; len < field_width; --field_width)

  		ADDCH(buf, ' ');
  	return buf;
  }

  static char *device_path_string(char *buf, char *end, void *dp, int field_width,
  				int precision, int flags)
  {
  	u16 *str;

  	/* If dp == NULL output the string '<NULL>' */

  	if (!dp)

  		return string16(buf, end, dp, field_width, precision, flags);

  
  	str = efi_dp_str((struct efi_device_path *)dp);
  	if (!str)
  		return ERR_PTR(-ENOMEM);
  
  	buf = string16(buf, end, str, field_width, precision, flags);
  	efi_free_pool(str);
  	return buf;
  }
  #endif

  #ifdef CONFIG_CMD_NET

  static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width,

  				int precision, int flags)

  {

  	/* (6 * 2 hex digits), 5 colons and trailing zero */
  	char mac_addr[6 * 3];

  	char *p = mac_addr;
  	int i;
  
  	for (i = 0; i < 6; i++) {

  		p = hex_byte_pack(p, addr[i]);

  		if (!(flags & SPECIAL) && i != 5)
  			*p++ = ':';
  	}
  	*p = '\0';

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

  }

  static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width,

  			 int precision, int flags)
  {

  	/* (8 * 4 hex digits), 7 colons and trailing zero */
  	char ip6_addr[8 * 5];

  	char *p = ip6_addr;
  	int i;
  
  	for (i = 0; i < 8; i++) {

  		p = hex_byte_pack(p, addr[2 * i]);
  		p = hex_byte_pack(p, addr[2 * i + 1]);

  		if (!(flags & SPECIAL) && i != 7)
  			*p++ = ':';
  	}
  	*p = '\0';

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

  }

  static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,

  			 int precision, int flags)
  {

  	/* (4 * 3 decimal digits), 3 dots and trailing zero */
  	char ip4_addr[4 * 4];

  	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, end, ip4_addr, field_width, precision,
  		      flags & ~SPECIAL);

  }

  #endif

  #ifdef CONFIG_LIB_UUID
  /*
   * This works (roughly) the same way as linux's, but we currently always
   * print lower-case (ie. we just keep %pUB and %pUL for compat with linux),
   * mostly just because that is what uuid_bin_to_str() supports.
   *
   *   %pUb:   01020304-0506-0708-090a-0b0c0d0e0f10
   *   %pUl:   04030201-0605-0807-090a-0b0c0d0e0f10
   */
  static char *uuid_string(char *buf, char *end, u8 *addr, int field_width,
  			 int precision, int flags, const char *fmt)
  {
  	char uuid[UUID_STR_LEN + 1];
  	int str_format = UUID_STR_FORMAT_STD;
  
  	switch (*(++fmt)) {
  	case 'L':
  	case 'l':
  		str_format = UUID_STR_FORMAT_GUID;
  		break;
  	case 'B':
  	case 'b':
  		/* this is the default */
  		break;
  	default:
  		break;
  	}

  	if (addr)
  		uuid_bin_to_str(addr, uuid, str_format);
  	else
  		strcpy(uuid, "<NULL>");

  
  	return string(buf, end, uuid, field_width, precision, flags);
  }
  #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, char *end, void *ptr,
  		int field_width, int precision, int flags)

  {

  	u64 num = (uintptr_t)ptr;

  	/*
  	 * Being a boot loader, we explicitly allow pointers to
  	 * (physical) address null.
  	 */
  #if 0

  	if (!ptr)

  		return string(buf, end, "(null)", field_width, precision,
  			      flags);

  #endif

  	switch (*fmt) {

  /* Device paths only exist in the EFI context. */
  #if CONFIG_IS_ENABLED(EFI_LOADER) && !defined(API_BUILD)

  	case 'D':
  		return device_path_string(buf, end, ptr, field_width,
  					  precision, flags);
  #endif

  #ifdef CONFIG_CMD_NET

  	case 'a':
  		flags |= SPECIAL | ZEROPAD;
  
  		switch (fmt[1]) {
  		case 'p':
  		default:
  			field_width = sizeof(phys_addr_t) * 2 + 2;
  			num = *(phys_addr_t *)ptr;
  			break;
  		}
  		break;

  	case 'm':
  		flags |= SPECIAL;
  		/* Fallthrough */
  	case 'M':

  		return mac_address_string(buf, end, ptr, field_width,
  					  precision, flags);

  	case 'i':
  		flags |= SPECIAL;
  		/* Fallthrough */
  	case 'I':
  		if (fmt[1] == '6')

  			return ip6_addr_string(buf, end, ptr, field_width,
  					       precision, flags);

  		if (fmt[1] == '4')

  			return ip4_addr_string(buf, end, ptr, field_width,
  					       precision, flags);

  		flags &= ~SPECIAL;
  		break;

  #endif

  #ifdef CONFIG_LIB_UUID
  	case 'U':
  		return uuid_string(buf, end, ptr, field_width, precision,
  				   flags, fmt);
  #endif
  	default:
  		break;
  	}

  	flags |= SMALL;
  	if (field_width == -1) {
  		field_width = 2*sizeof(void *);
  		flags |= ZEROPAD;
  	}

  	return number(buf, end, num, 16, field_width, precision, flags);

  }

  static int vsnprintf_internal(char *buf, size_t size, const char *fmt,
  			      va_list args)

  {

  	u64 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 */

  	char *end = buf + size;

  	/* Make sure end is always >= buf - do we want this in U-Boot? */
  	if (end < buf) {
  		end = ((void *)-1);
  		size = end - buf;
  	}

  	str = buf;

  	for (; *fmt ; ++fmt) {

  		if (*fmt != '%') {

  			ADDCH(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)

  					ADDCH(str, ' ');
  			}
  			ADDCH(str, (unsigned char) va_arg(args, int));

  			while (--field_width > 0)

  				ADDCH(str, ' ');

  			continue;
  
  		case 's':

  /* U-Boot uses UTF-16 strings in the EFI context only. */
  #if CONFIG_IS_ENABLED(EFI_LOADER) && !defined(API_BUILD)
  			if (qualifier == 'l') {

  				str = string16(str, end, va_arg(args, u16 *),
  					       field_width, precision, flags);

  			} else
  #endif
  			{

  				str = string(str, end, va_arg(args, char *),
  					     field_width, precision, flags);
  			}

  			continue;
  
  		case 'p':

  			str = pointer(fmt + 1, str, end,

  					va_arg(args, void *),
  					field_width, precision, flags);

  			if (IS_ERR(str))
  				return PTR_ERR(str);

  			/* 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 '%':

  			ADDCH(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:

  			ADDCH(str, '%');

  			if (*fmt)

  				ADDCH(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, end, num, base, field_width, precision,
  			     flags);
  	}

  	if (size > 0) {
  		ADDCH(str, '\0');
  		if (str > end)
  			end[-1] = '\0';

  		--str;

  	}

  	/* the trailing null byte doesn't count towards the total */

  	return str - buf;

  }

  int vsnprintf(char *buf, size_t size, const char *fmt,
  			      va_list args)
  {
  	return vsnprintf_internal(buf, size, fmt, args);
  }

  int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
  {
  	int i;
  
  	i = vsnprintf(buf, size, fmt, args);
  
  	if (likely(i < size))
  		return i;
  	if (size != 0)
  		return size - 1;
  	return 0;
  }

  int snprintf(char *buf, size_t size, const char *fmt, ...)
  {
  	va_list args;
  	int i;
  
  	va_start(args, fmt);
  	i = vsnprintf(buf, size, fmt, args);
  	va_end(args);
  
  	return i;
  }

  int scnprintf(char *buf, size_t size, const char *fmt, ...)
  {
  	va_list args;
  	int i;
  
  	va_start(args, fmt);
  	i = vscnprintf(buf, size, fmt, args);
  	va_end(args);
  
  	return i;
  }

  
  /**
   * Format a string and place it in a buffer (va_list version)
   *
   * @param buf	The buffer to place the result into
   * @param fmt	The format string to use
   * @param args	Arguments for the format string
   *
   * The function returns the number of characters written
   * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
   * buffer overflows.
   *
   * If you're not already dealing with a va_list consider using sprintf().
   */
  int vsprintf(char *buf, const char *fmt, va_list args)
  {
  	return vsnprintf_internal(buf, INT_MAX, fmt, args);
  }

  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;
  }

  #if CONFIG_IS_ENABLED(PRINTF)

  int printf(const char *fmt, ...)
  {
  	va_list args;
  	uint i;
  	char printbuffer[CONFIG_SYS_PBSIZE];
  
  	va_start(args, fmt);
  
  	/*
  	 * For this to work, printbuffer must be larger than
  	 * anything we ever want to print.
  	 */
  	i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
  	va_end(args);

  	/* Handle error */
  	if (i <= 0)
  		return i;

  	/* Print the string */
  	puts(printbuffer);
  	return i;
  }
  
  int vprintf(const char *fmt, va_list args)
  {
  	uint i;
  	char printbuffer[CONFIG_SYS_PBSIZE];
  
  	/*
  	 * For this to work, printbuffer must be larger than
  	 * anything we ever want to print.
  	 */
  	i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);

  	/* Handle error */
  	if (i <= 0)
  		return i;

  	/* Print the string */
  	puts(printbuffer);
  	return i;
  }

  #endif

  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;
  }

  
  /* We don't seem to have %'d in U-Boot */
  void print_grouped_ull(unsigned long long int_val, int digits)
  {
  	char str[21], *s;
  	int grab = 3;
  
  	digits = (digits + 2) / 3;
  	sprintf(str, "%*llu", digits * 3, int_val);
  	for (s = str; *s; s += grab) {
  		if (s != str)
  			putc(s[-1] != ' ' ? ',' : ' ');
  		printf("%.*s", grab, s);
  		grab = 3;
  	}
  }

  
  bool str2off(const char *p, loff_t *num)
  {
  	char *endptr;
  
  	*num = simple_strtoull(p, &endptr, 16);
  	return *p != '\0' && *endptr == '\0';
  }
  
  bool str2long(const char *p, ulong *num)
  {
  	char *endptr;
  
  	*num = simple_strtoul(p, &endptr, 16);
  	return *p != '\0' && *endptr == '\0';
  }