/*
 *  linux/lib/vsprintf.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 * (C) Copyright 2000-2009
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 */

/* 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 <stdarg.h>
#include <vsprintf.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;
}

#if CONFIG_IS_ENABLED(EFI_DEVICE_PATH_TO_TEXT)
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
#endif

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);
}

#ifdef CONFIG_LIB_UUID
/*
 * This works (roughly) the same way as Linux's.
 *
 *   %pUb:   01020304-0506-0708-090a-0b0c0d0e0f10
 *   %pUB:   01020304-0506-0708-090A-0B0C0D0E0F10
 *   %pUl:   04030201-0605-0807-090a-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;

        switch (*(++fmt)) {
        case 'L':
                str_format = UUID_STR_FORMAT_GUID | UUID_STR_UPPER_CASE;
                break;
        case 'l':
                str_format = UUID_STR_FORMAT_GUID;
                break;
        case 'B':
                str_format = UUID_STR_FORMAT_STD | UUID_STR_UPPER_CASE;
                break;
        default:
                str_format = UUID_STR_FORMAT_STD;
                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_DEVICE_PATH_TO_TEXT) && !defined(API_BUILD)
        case 'D':
                return device_path_string(buf, end, ptr, field_width,
                                          precision, flags);
#endif
        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;
#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';
}

char *strmhz(char *buf, unsigned long hz)
{
        long l, n;
        long m;

        n = DIV_ROUND_CLOSEST(hz, 1000) / 1000L;
        l = sprintf(buf, "%ld", n);

        hz -= n * 1000000L;
        m = DIV_ROUND_CLOSEST(hz, 1000L);
        if (m != 0)
                sprintf(buf + l, ".%03ld", m);

        return buf;
}