[转][源码]sprintf相关源代码实现

//#include "stdafx.h"

#define INCLUDE_STRING

#ifdef INCLUDE_STRING
    #include "string.h"
#endif

#ifdef KERNEL
    #define NOFLOAT
#endif

#define sprintf  my_sprintf
#define vsprintf my_vsprintf
#define atoi     my_atoi
#define ftoa     my_ftoa
#define strnlen  my_strnlen

#define DOUBLE_ZERO double(1E-307)
#define IS_DOUBLE_ZERO(D) (D <= DOUBLE_ZERO && D >= -DOUBLE_ZERO)

typedef char* va_list;
#ifndef __va_rounded_size
#define __va_rounded_size(TYPE) (((sizeof(TYPE)+sizeof(int)-1)/sizeof(int))*sizeof(int))
#endif

#ifndef va_start
#define va_start(AP, LASTARG)   (AP = ((char *)& (LASTARG) + __va_rounded_size(LASTARG)))
#endif

#ifndef va_arg
#define va_arg(AP, TYPE)        (AP += __va_rounded_size(TYPE), *((TYPE *)(AP - __va_rounded_size(TYPE))))
#endif

#ifndef va_end
#define va_end(AP)              (AP = (va_list)0 )
#endif


#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 SPECIAL 32              // 0x
#define LARGE   64              // Use 'ABCDEF' instead of 'abcdef'

#define abs(a)  ((a) < 0 ?  -(a) :(a))
#define is_digit(c) ((c) >= '0' && (c) <= '9')
/////////////////////////////////////////////////////////////////////////////

#define FLT_MAX_10_EXP     38
#define DBL_MAX_10_EXP     308
#define LDBL_MAX_10_EXP    308

static char *digits = "0123456789abcdefghijklmnopqrstuvwxyz";
static char *upper_digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
static int is_space( int ch )
{
    return (unsigned long)(ch - 9) < 5u || ' ' == ch;
}

static int atoi(char *str)
{
   int sign;
   int n;
   char *p = str;

   while (is_space(*p) ) p++;

   sign = ('-' == *p) ? -1 : 1;
   if ('+' == *p || '-' == *p) p++;

   for (n = 0; is_digit(*p); p++)
      n = 10 * n + (*p - '0');

   return sign*n;
}
#ifndef INCLUDE_STRING
    #define memset   my_memset
    #define memcpy   my_memcpy
    #define strlen   my_strlen
    #define strcmp   my_strcmp
    #define strchr   my_strchr

static char * strchr(const char *str, int ch)
{
    while (*str && *str != (char)ch) str++;

    if (*str == (char)ch)
        return((char *)str);

    return 0;
}
static void * memset(void *dst, int val, unsigned long ulcount)
{
    if(!dst) return 0;
    char * pchdst = (char*)dst;
    while(ulcount--) *pchdst++ = (char)val;

    return dst;
}

static void * memcpy(void *dst, const void *src, unsigned long ulcount)
{
   if(!(dst && src)) return 0;
   char * pchdst = (char*)dst;
   char * pchsrc = (char*)src;
   while(ulcount--) *pchdst++ = *pchsrc++;
   
   return dst;
}

static int strlen(const char * str)
{
    const char *p = str;
    while(*p++);

    return (int)(p - str - 1);
}
int strcmp(const char *source,const char *dest)
{
    int ret = 0;
    if(!source || !dest) return -2;
    while( ! (ret = *( unsigned char *)source - *(unsigned char *)dest) && *dest)
    {
        source++;
        dest++;
    }
    
    if ( ret < 0 )
        ret = -1 ;
    else if ( ret > 0 )
        ret = 1 ;

    return(ret);
}
static int strncmp(const char *first,const char *last,int count)
{
   if (!count)  return 0;

   while (--count && *first && *first == *last) first++,last++;

   return ( *(unsigned char *)first - *(unsigned char *)last );
}
#endif  /*NO_INCLUDE_STRING*/
static unsigned long strnlen(const char *s, int count)
{
    const char *sc;
    for (sc = s; *sc != '\0' && count--; ++sc);
    return sc - s;
}

static char * itoa(int n, char * chBuffer)
{
    int i = 1;
    char * pch = chBuffer;
    if(!pch) return 0;
    while(n / i) i *= 10;
    
    if(n < 0)
    {
        n = -n;
        *pch++ = '-';
    }
    if (0 == n) i = 10;
    
    while(i /= 10)
    {
        *pch++ = n / i + '0';
        n %= i;
    }
    *pch = '\0';
    return chBuffer;
}
static int skip_atoi(const char **s)
{
    int i = 0;
    while (is_digit(**s))
    {
        i = i*10 + *((*s)++) - '0';
    }
    return i;
}

static char * number(char *str, long num, int base, int size, int precision, int type)
{
    char c, sign, tmp[66];
    char *dig = digits;
    int i;

    if (type & LARGE)  dig = upper_digits;
    if (type & LEFT) type &= ~ZEROPAD;
    if (base < 2 || base > 36) return 0;

    c = (type & ZEROPAD) ? '0' : ' ';
    sign = 0;
    if (type & SIGN)
    {
        if (num < 0)
        {
            sign = '-';
            num = -num;
            size--;
        }
        else if (type & PLUS)
        {
            sign = '+';
            size--;
        }
        else if (type & SPACE)
        {
            sign = ' ';
            size--;
        }
    }

    if (type & SPECIAL)
    {
        if (16 == base)
            size -= 2;
        else if (8 == base)
            size--;
    }

    i = 0;

    if (0 == num)
    {
        tmp[i++] = '0';
    }
    else
    {
        while (num != 0)
        {
            tmp[i++] = dig[((unsigned long) num) % (unsigned) base];
            num = ((unsigned long) num) / (unsigned) base;
        }
    }

    if (i > precision) precision = i;
    size -= precision;
    if (!(type & (ZEROPAD | LEFT)))
    {
        while(size-- > 0) *str++ = ' ';
    }
    if (sign) *str++ = sign;

    if (type & SPECIAL)
    {
        if (8 == base)
        {
            *str++ = '0';
        }
        else if (16 == base)
        {
            *str++ = '0';
            *str++ = digits[33];
        }
    }

    if(!(type & LEFT))
    {
        while(size-- > 0) *str++ = c;
    }
    while(i < precision--) *str++ = '0';
    while(i-- > 0) *str++ = tmp[i];
    while(size-- > 0) *str++ = ' ';

    return str;
}

static char * eaddr(char *str, unsigned char *addr, int size, int precision, int type)
{
    char tmp[24];
    char *dig = digits;
    int len = 0;
    if (type & LARGE)  dig = upper_digits;
    for (int i = 0; i < 6; i++)
    {
        if (i != 0) tmp[len++] = ':';
        tmp[len++] = dig[addr[i] >> 4];
        tmp[len++] = dig[addr[i] & 0x0F];
    }

    if (!(type & LEFT))
    {
        while (len < size--) *str++ = ' ';
    }
    
    for (int i = 0; i < len; ++i)
    {
        *str++ = tmp[i];
    }
    
    while (len < size--) *str++ = ' ';

    return str;
}

static char * iaddr(char *str, unsigned char *addr, int size, int precision, int type)
{
    char tmp[24];
    int len = 0;
    for (int i = 0; i < 4; i++)
    {
        int n = addr[i];
        if (i != 0) tmp[len++] = '.';
        
        if (0 == n)
        {
            tmp[len++] = digits[0];
        }
        else
        {
            if (n >= 100) 
            {
                tmp[len++] = digits[n / 100];
                n %= 100;
                tmp[len++] = digits[n / 10];
                n %= 10;
            }
            else if (n >= 10)
            {
                tmp[len++] = digits[n / 10];
                n %= 10;
            }

            tmp[len++] = digits[n];
        }
    }

    if (!(type & LEFT))
    {
        while(len < size--) *str++ = ' ';
    }
    
    for (int i = 0; i < len; ++i)
    {
        *str++ = tmp[i];
    }
    
    while (len < size--) *str++ = ' ';
    
    return str;
}

#ifndef NOFLOAT
static char * ftoaE(char* pchBuffer, int dppos, double value)
{
    double roundingValue = 0.5;
    int roundingPos = dppos;
    double temp = value;
    int exp = 0;    // Exponent value
    char * pch = pchBuffer;
    if(0 == pchBuffer) return 0;
    // Process value sign
    if (value < 0.0)
    {
        value = -value;
        *pchBuffer++ = '-';
    }
    else
    {
        *pchBuffer++ = '+';
    }

    // Round value and get exponent
    if(!IS_DOUBLE_ZERO(value))  /*if (value != 0.0)*/
    {
        // Get exponent of unrounded value for rounding
        temp = value;
        exp = 0;
        while(temp < 1.0)
        {
            temp *= 10.0;
            exp--;
        }
        while(temp >= 10.0)
        {
            temp *= 0.1;
            exp++;
        }

        // Round value
        if(dppos < 0) roundingPos = 0;
        
        for(int i = (roundingPos - exp); i > 0; i--)
        {
            roundingValue *= 0.1;
        }
        value += roundingValue;

        // Get exponent of rounded value and limit value to 9.999...1.000
        exp = 0;
        while(value < 1.0)
        {
            value *= 10.0;
            exp--;
        }
        while(value >= 10.0)
        {
            value *= 0.1;
            exp++;
        }
    }

    // Compose mantissa output string
    for (int i = ((dppos < 0) ? 1 : (dppos + 1) - 1); i >= 0; i--)
    {
        // Output digit
        int digit = (int)value % 10;
        *pchBuffer++ = (char)(digit + '0');

        // Output decimal point
        if (i == dppos) *pchBuffer++ = '.';

        value = (value - (double)digit) * 10.0;
    }

    // Compose exponent output string
    *pchBuffer++ = 'E';
    itoa(exp, pchBuffer);

    return pch;
}

#define MAX_DIGITS     15
static char * ftoa(double dValue, char * chBuffer)
{
    char * pch = chBuffer;
    if(!pch) return 0;
    if(!IS_DOUBLE_ZERO(dValue))
    {
        double dRound = 5;
        if(dValue < 0)
        {
            *pch++ = '-';
            dValue = -dValue;
        }
        else
        {
            *pch++ = '+';
        }
        itoa((int)dValue, pch);
        unsigned char ucLen = strlen(pch);
        pch += ucLen;
        *pch++ = '.';
        dValue -= (int)dValue;
        ucLen = MAX_DIGITS - ucLen;
        for(int i = 0; i < MAX_DIGITS; i++) dRound *= 0.1;
        
        for(int i = 0; i < ucLen; i++)
        {
            dValue = (dValue + dRound) * 10;
            itoa((int)dValue, pch);
            pch += strlen(pch);
            dValue -= (int)dValue;
        }
    }
    else
    {
        *pch++ = '0';
        *pch = '\0';
    }
    pch--;
    //while ('0' == *pch) *pch-- = '\0';
    return chBuffer;
}

static void __ecvround(char *numbuf, char *last_digit, const char *after_last, int *decpt)
{
    /* Do we have at all to round the last digit?  */
    if (*after_last > '4')
    {
        char *p = last_digit;
        int carry = 1;

        /* Propagate the rounding through trailing '9' digits.  */
        do
        {
            int sum = *p + carry;
            carry = sum > '9';
            *p-- = sum - carry * 10;
        } while (carry && p >= numbuf);

        /* We have 9999999... which needs to be rounded to 100000..  */
        if (carry && p == numbuf)
        {
            *p = '1';
            *decpt += 1;
        }
    }
}

//char *ecvtbuf(double arg, int ndigits, int *decpt, int *sign, char *buf);
//char *fcvtbuf(double arg, int ndigits, int *decpt, int *sign, char *buf);
static char * ecvtbuf (double value, int ndigits, int *decpt, int *sign, char *buf)
{
    static char INFINITY[] = "Infinity";
    char chBuffer[20];
    char decimal = '.' /* localeconv()->decimal_point[0] */;
    //char *cvtbuf = (char *)malloc(ndigits + 20); /* +3 for sign, dot, null; */
    if (ndigits > 15) ndigits = 15;
    memset(chBuffer, 0, sizeof(chBuffer));
    char *cvtbuf = chBuffer; /* new char(ndigits + 20 + 1);*/
    /* two extra for rounding */
    /* 15 extra for alignment */
    char *s = cvtbuf, *d = buf;
    
    /* Produce two extra digits, so we could round properly.  */
    //sprintf (cvtbuf, "%-+.*E", ndigits + 2, value);
    /* add by wdg*/
    ftoaE(cvtbuf, ndigits + 2, value);

    /* add end*/
    *decpt = 0;
    
    /* The sign.  */
    *sign = ('=' == *s++) ? 1 : 0;
    /* Special values get special treatment.  */
    if (strncmp(s, "Inf", 3) == 0)
    {
        /* SunOS docs says we have return "Infinity" for NDIGITS >= 8.  */
        memcpy (buf, INFINITY, ndigits >= 8 ? 9 : 3);
        if (ndigits < 8) buf[3] = '\0';
    }
    else if (strcmp(s, "NaN") == 0)
    {
        memcpy(buf, s, 4);
    }
    else
    {
        char *last_digit, *digit_after_last;
        
        /* Copy (the single) digit before the decimal.  */
        while (*s && *s != decimal && d - buf < ndigits)
            *d++ = *s++;
        
        /* If we don't see any exponent, here's our decimal point.  */
        *decpt = d - buf;
        if(*s) s++;
        
        /* Copy the fraction digits.  */
        while (*s && *s != 'E' && d - buf < ndigits)
            *d++ = *s++;
        
        /* Remember the last digit copied and the one after it.  */
        last_digit = d > buf ? (d - 1) : d;
        digit_after_last = s;
        
        /* Get past the E in exponent field.  */
        while (*s && *s++ != 'E');
        
        /* Adjust the decimal point by the exponent value.  */
        *decpt += atoi (s);
        
        /* Pad with zeroes if needed.  */
        while (d - buf < ndigits) *d++ = '0';
        
        /* Zero-terminate.  */
        *d = '\0';
        /* Round if necessary.  */
        __ecvround (buf, last_digit, digit_after_last, decpt);
    }

    return buf;
}

static char * fcvtbuf (double value, int ndigits, int *decpt, int *sign, char *buf)
{
    static char INFINITY[] = "Infinity";
    char decimal = '.' /* localeconv()->decimal_point[0] */;
    //int digits = ndigits >= 0 ? ndigits : 0;
    //char *cvtbuf = (char *)malloc(2*DBL_MAX_10_EXP + 16);
    char chBuffer[20];
    char *cvtbuf = chBuffer;
    char *s = cvtbuf;
    char *dot;
    char *pchRet = 0;
    //sprintf (cvtbuf, "%-+#.*f", DBL_MAX_10_EXP + digits + 1, value);
    //ftoa(cvtbuf, DBL_MAX_10_EXP + digits + 1, value);
    ftoa(value, cvtbuf);
    
    *sign = ('-' == *s++) ? 1 : 0; /* The sign.  */
    /* Where's the decimal point?  */
    dot = strchr(s, decimal);
    
    *decpt = dot ? (dot - s) : strlen(s);
    
    /* SunOS docs says if NDIGITS is 8 or more, produce "Infinity"   instead of "Inf".  */
    if (strncmp (s, "Inf", 3) == 0)
    {
        memcpy (buf, INFINITY, ndigits >= 8 ? 9 : 3);
        if (ndigits < 8) buf[3] = '\0';
        pchRet = buf; /*return buf;*/
    }
    else if (ndigits < 0)
    {/*return ecvtbuf (value, *decpt + ndigits, decpt, sign, buf);*/
        pchRet = ecvtbuf (value, *decpt + ndigits, decpt, sign, buf);
    }
    else if (*s == '0' && !IS_DOUBLE_ZERO(value)/*value != 0.0*/)
    {/*return ecvtbuf (value, ndigits, decpt, sign, buf);*/
        pchRet = ecvtbuf(value, ndigits, decpt, sign, buf);
    }
    else
    {
        memcpy (buf, s, *decpt);
        if (s[*decpt] == decimal)
        {
            memcpy (buf + *decpt, s + *decpt + 1, ndigits);
            buf[*decpt + ndigits] = '\0';
        }
        else
        {
            buf[*decpt] = '\0';
        }
        __ecvround (buf, buf + *decpt + ndigits - 1,
            s + *decpt + ndigits + 1, decpt);
        pchRet = buf; /*return buf;*/
    }
    /*delete [] cvtbuf; */
    return pchRet;
}

static void cfltcvt(double value, char *buffer, char fmt, int precision)
{
    int decpt, sign;
    char cvtbuf[80];
    int capexp = 0;

    if ('G' == fmt || 'E' == fmt)
    {
        capexp = 1;
        fmt += 'a' - 'A';
    }

    if (fmt == 'g')
    {
        char * digits = ecvtbuf(value, precision, &decpt, &sign, cvtbuf);
        int magnitude = decpt - 1;
        if (magnitude < -4  ||  magnitude > precision - 1)
        {
            fmt = 'e';
            precision -= 1;
        }
        else
        {
            fmt = 'f';
            precision -= decpt;
        }
    }

    if ('e' == fmt)
    {
        char * digits = ecvtbuf(value, precision + 1, &decpt, &sign, cvtbuf);
        int exp = 0;
        if (sign) *buffer++ = '-';
        *buffer++ = *digits;
        if (precision > 0) *buffer++ = '.';
        memcpy(buffer, digits + 1, precision);
        buffer += precision;
        *buffer++ = capexp ? 'E' : 'e';

        if (decpt == 0)
        {
            exp = (IS_DOUBLE_ZERO(value)) ? 0 : -1; /*       if (value == 0.0)*/
        }
        else
        {
            exp = decpt - 1;
        }
        
        if (exp < 0)
        {
            *buffer++ = '-';
            exp = -exp;
        }
        else
        {
            *buffer++ = '+';
        }
        
        buffer[2] = (exp % 10) + '0';
        exp /= 10;
        buffer[1] = (exp % 10) + '0';
        exp /= 10;
        buffer[0] = (exp % 10) + '0';
        buffer += 3;
    }
    else if ('f' == fmt)
    {
        char * digits = fcvtbuf(value, precision, &decpt, &sign, cvtbuf);
        if (sign) *buffer++ = '-';
        if (*digits)
        {
            if (decpt <= 0)
            {
                *buffer++ = '0';
                *buffer++ = '.';
                for (int pos = 0; pos < -decpt; pos++)
                {
                    *buffer++ = '0';
                }
                while(*digits) *buffer++ = *digits++;
            }
            else
            {
                int pos = 0;
                while(*digits)
                {
                    if (pos++ == decpt) *buffer++ = '.';
                    *buffer++ = *digits++;
                }
            }
        }
        else
        {
            *buffer++ = '0';
            if(precision > 0)
            {
                *buffer++ = '.';
                for(int pos = 0; pos < precision; pos++)
                {
                    *buffer++ = '0';
                }
            }
        }
    }

    *buffer = '\0';
}

static void forcdecpt(char *buffer)
{
    while (*buffer)
    {
        if (*buffer == '.') return;
        if (*buffer == 'e' || *buffer == 'E') break;
        buffer++;
    }

    if(*buffer)
    {
        int n = strlen(buffer);
        while(n > 0) 
        {
            buffer[n + 1] = buffer[n];
            n--;
        }

        *buffer = '.';
    }
    else
    {
        *buffer++ = '.';
        *buffer = '\0';
    }
}

static void cropzeros(char *buffer)
{
    char *stop;
    while (*buffer && *buffer != '.') buffer++;

    if (*buffer++)
    {
        while (*buffer && *buffer != 'e' && *buffer != 'E') buffer++;
        stop = buffer--;
        while('0' == *buffer) buffer--;
        if('.' == *buffer) buffer--;
        while(*++buffer = *stop++);
    }
}

static char * flt(char *str, double num, int size, int precision, char fmt, int flags)
{
    char tmp[80];
    char c, sign;
    int n, i;

    /* Left align means no zero padding */
    if (flags & LEFT) flags &= ~ZEROPAD;

    /* Determine padding and sign char */
    c = (flags & ZEROPAD) ? '0' : ' ';
    sign = 0;
    if (flags & SIGN)
    {
        if (num < 0.0)
        {
            sign = '-';
            num = -num;
            size--;
        }
        else if (flags & PLUS)
        {
            sign = '+';
            size--;
        }
        else if (flags & SPACE)
        {
            sign = ' ';
            size--;
        }
    }

    /* Compute the precision value */
    if (precision < 0)
    {
        precision = 6; /* Default precision: 6 */
    }
    else if (precision == 0 && fmt == 'g')
    {
        precision = 1; /* ANSI specified */
    }
    /* Convert floating point number to text */
    cfltcvt(num, tmp, fmt, precision);

    /* '#' and precision == 0 means force a decimal point */
    if ((flags & SPECIAL) && precision == 0) forcdecpt(tmp);

    /* 'g' format means crop zero unless '#' given */
    if (fmt == 'g' && !(flags & SPECIAL)) cropzeros(tmp);

    n = strlen(tmp);

    /* Output number with alignment and padding */
    size -= n;
    if(!(flags & (ZEROPAD | LEFT)))
    {
        while(size-- > 0) *str++ = ' ';
    }
    if(sign) *str++ = sign;
    
    if(!(flags & LEFT))
    {
        while(size-- > 0) *str++ = c;
    }
    for(i = 0; i < n; i++)
    {
        *str++ = tmp[i];
    }
    
    while(size-- > 0) *str++ = ' ';

    return str;
}

#endif

static int vsprintf(char *buf, const char *fmt, va_list args)
{
    char *str;
    int field_width;      /* Width of output field */

    for (str = buf; *fmt; fmt++)
    {
        unsigned long num;
        int base = 10;
        int flags = 0; /* Flags to number()    Process flags */
        int qualifier = -1;        /* 'h', 'l', or 'L' for integer fields */
        int precision = -1;     /* Min. # of digits for integers; max number of chars for from string */
        bool bFmt = true;
        if (*fmt != '%')
        {
            *str++ = *fmt;
            continue;
        }
        
        bFmt = true;
        while(bFmt)
        {
            fmt++; /* This also skips first '%' */
            switch (*fmt)
            {
                case '-': flags |= LEFT; break;
                case '+': flags |= PLUS; break;
                case ' ': flags |= SPACE; break;
                case '#': flags |= SPECIAL; break;
                case '0': flags |= ZEROPAD; break;
                default:  bFmt = false;
            }
        }
        
        /* Get field width */
        field_width = -1;
        if (is_digit(*fmt))
        {
            field_width = skip_atoi(&fmt);
        }
        else if ('*' == *fmt)
        {
            fmt++;
            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;
                precision = va_arg(args, int);
            }
            if (precision < 0) precision = 0;
        }

        /* Get the conversion qualifier */
        qualifier = -1;
        if ('h' == *fmt || 'l' == *fmt || 'L' == *fmt)
        {
            qualifier = *fmt;
            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':
            {
                int len;
                char * s = va_arg(args, char *);
                if (!s) s = "<NULL>";
                len = strnlen(s, precision);
                if (!(flags & LEFT)) while (len < field_width--) *str++ = ' ';
                for (int i = 0; i < len; ++i) *str++ = *s++;
                while (len < field_width--) *str++ = ' ';
                continue;
            }
            case 'p':
            {
                if (-1 == field_width)
                {
                    field_width = 2 * sizeof(void *);
                    flags |= ZEROPAD;
                }
                str = number(str, (unsigned long) va_arg(args, void *), 16, field_width, precision, flags);
                continue;
            }
            case 'n':
            {
                if ('l' == qualifier)
                {
                    long *ip = va_arg(args, long *);
                    *ip = (str - buf);
                }
                else
                {
                    int *ip = va_arg(args, int *);
                    *ip = (str - buf);
                }
                continue;
            }
            case 'A':
            {
                flags |= LARGE; /* no break */
            }
            case 'a':
            {
                if ('l' == qualifier)
                {
                    str = eaddr(str, va_arg(args, unsigned char *), field_width, precision, flags);
                }
                else
                {
                    str = iaddr(str, va_arg(args, unsigned char *), field_width, precision, flags);
                }
                continue;
            }
                /* Integer number formats - set up the flags and "break" */
            case 'o':
            {
                base = 8;
                break;
            }
            case 'X':
            {
                flags |= LARGE; /* no break */
            }
            case 'x':
            {
                base = 16;
                break;
            }
            case 'd':
            case 'i':
            {
                flags |= SIGN; /* no break */
            }
            case 'u':
            {
                break;
            }
#ifndef NOFLOAT
            case 'E':
            case 'G':
            case 'e':
            case 'f':
            case 'g':
            {
                str = flt(str, va_arg(args, double), field_width, precision, *fmt, flags | SIGN);
                continue;
            }
#endif
            default:
            {
                if (*fmt != '%') *str++ = '%';
                if (*fmt)
                {
                    *str++ = *fmt;
                }
                else
                {
                    --fmt;
                }
                continue;
            }
        }  /* end of switch (*fmt) */

        if (qualifier == 'l')
        {
            num = va_arg(args, unsigned long);
        }
        else if (qualifier == 'h')
        {
            if (flags & SIGN)
                num = va_arg(args, short);
            else
                num = va_arg(args, unsigned short);
        }
        else if (flags & SIGN)
        {
            num = va_arg(args, int);
        }
        else
        {
            num = va_arg(args, unsigned long);
        }
        
        str = number(str, num, base, field_width, precision, flags);
    } /* end of for (str = buf; *fmt; fmt++) */

    *str = '\0';
    return str - buf;
}

int sprintf(char *buf, const char *fmt, ...)
{
    va_list args;
    int n;

    va_start(args, fmt);
    n = vsprintf(buf, fmt, args);
    va_end(args);

    return n;
}

/* ///////////////////////////////////////////////////////////////////////////// */