/*---------------------------------------------------------------------------*
  Project:  TwlSDK - libraries - STD
  File:     std_sprintf.c

  Copyright 2007-2008 Nintendo. All rights reserved.

  These coded instructions, statements, and computer programs contain
  proprietary information of Nintendo of America Inc. and/or Nintendo
  Company Ltd., and are protected by Federal copyright law. They may
  not be disclosed to third parties or copied or duplicated in any form,
  in whole or in part, without the prior written consent of Nintendo.

  $Date:: 2008-11-07#$
  $Rev: 9262 $
  $Author: yosizaki $
 *---------------------------------------------------------------------------*/


#include <nitro.h>


/*---------------------------------------------------------------------------*/
/* Functions */

/* Internal functions for sized-buffer output */
typedef struct dst_string_tag
{
    size_t  len;
    char   *cur;
    char   *base;
}
dst_string;

static void string_put_char(dst_string * p, char c)
{
    if (p->len > 0)
        *p->cur = c, --p->len;
    ++p->cur;
}

static void string_fill_char(dst_string * p, char c, int n)
{
    if (n > 0)
    {
        size_t  i, k = p->len;
        if (k > (size_t) n)
            k = (size_t) n;
        for (i = 0; i < k; ++i)
            p->cur[i] = c;
        p->len -= k;
        p->cur += n;
    }
}

static void string_put_string(dst_string * p, const char *s, int n)
{
    if (n > 0)
    {
        size_t  i, k = p->len;
        if (k > (size_t) n)
            k = (size_t) n;
        for (i = 0; i < k; ++i)
            p->cur[i] = s[i];
        p->len -= k;
        p->cur += n;
    }
}

/*---------------------------------------------------------------------------*
  Name:         STD_TSPrintf

  Description:  With the exception of the format of the arguments, identical to STD_TVSNPrintf.

  Arguments:    dst: The buffer that will store the result
                fmt: Format control string

  Returns:      Identical to STD_VSNPrintf.
 *---------------------------------------------------------------------------*/
SDK_WEAK_SYMBOL int STD_TSPrintf(char *dst, const char *fmt, ...)
{
    int     ret;
    va_list vlist;
    va_start(vlist, fmt);
    ret = STD_TVSNPrintf(dst, 0x7FFFFFFF, fmt, vlist);
    va_end(vlist);
    return ret;
}

/*---------------------------------------------------------------------------*
  Name:         STD_TVSPrintf

  Description:  With the exception of the format of the arguments, identical to STD_TVSNPrintf.

  Arguments:    dst: The buffer that will store the result
                fmt: Format control string
                vlist: Parameters

  Returns:      Identical to STD_VSNPrintf.
 *---------------------------------------------------------------------------*/
SDK_WEAK_SYMBOL int STD_TVSPrintf(char *dst, const char *fmt, va_list vlist)
{
    return STD_TVSNPrintf(dst, 0x7FFFFFFF, fmt, vlist);
}

/*---------------------------------------------------------------------------*
  Name:         STD_TSNPrintf

  Description:  With the exception of the format of the arguments, identical to STD_TVSNPrintf.

  Arguments:    dst: The buffer that will store the result
                len: Buffer length
                fmt: Format control string
 
  Returns:      Identical to STD_VSNPrintf.
 *---------------------------------------------------------------------------*/
SDK_WEAK_SYMBOL int STD_TSNPrintf(char *dst, size_t len, const char *fmt, ...)
{
    int     ret;
    va_list vlist;
    va_start(vlist, fmt);
    ret = STD_TVSNPrintf(dst, len, fmt, vlist);
    va_end(vlist);
    return ret;
}

/*---------------------------------------------------------------------------*
  Name:         STD_TVSNPrintf

  Description:  sprintf redone to save on size.
                Supports basic format specifications.
                %([-+# ]?)([0-9]*)(\.?)([0-9]*)([l|ll|h||hh]?)([diouxXpncs%])

  Note:         To match the behavior of CodeWarrior's MSL sprintf(), '+' and '#' are disabled.
                
                { // example
                  char buf[5];
                  sprintf(buf, "%-i\n", 45);  // "45"  (OK)
                  sprintf(buf, "%0i\n", 45);  // "45"  (OK)
                  sprintf(buf, "% i\n", 45);  // " 45" (OK)
                  sprintf(buf, "%+i\n", 45);  // "%+i" ("+45" expected)
                  sprintf(buf, "%#x\n", 45);  // "%#x" ("0x2d" expected)
                  // but, this works correctly!
                  sprintf(buf, "% +i\n", 45); // "+45" (OK)
                }

  Arguments:    dst: The buffer that will store the result
                len: Buffer length
                fmt: Format control string
                vlist: Parameters

  Returns:      Returns the number of characters (exclusive of '\0') when the format string is output correctly.
                When the buffer size is sufficient, all text is output and a terminator is provided.
                When the buffer size is not enough, termination occurs at dst[len-1].
                Nothing happens when len is 0.

 *---------------------------------------------------------------------------*/
SDK_WEAK_SYMBOL int STD_TVSNPrintf(char *dst, size_t len, const char *fmt, va_list vlist)
{
    char    buf[24];
    int     n_buf;
    char    prefix[2];
    int     n_prefix;

    const char *s = fmt;

    dst_string str;
    str.len = len, str.cur = str.base = dst;

    while (*s)
    {
        if ((unsigned int)(((unsigned char)*s ^ 0x20) - 0xA1) < 0x3C)
        {
            /* Shift JIS character */
            string_put_char(&str, *s++);
            if (*s)
                string_put_char(&str, *s++);
        }
        else if (*s != '%')
        {
            /* normal ASCII character */
            string_put_char(&str, *s++);
        }
        else
        {
            /* output with format */
            enum
            {
                flag_blank = 000001,   /* ' ' */
                flag_plus = 000002,    /* '+' */
                flag_sharp = 000004,   /* '#' */
                flag_minus = 000010,   /* '-' */
                flag_zero = 000020,    /* '0' */
                flag_l1 = 000040,      /* "l" */
                flag_h1 = 000100,      /* "h" */
                flag_l2 = 000200,      /* "ll" */
                flag_h2 = 000400,      /* "hh" */
                flag_unsigned = 010000, /* 'o', 'u', ... */
                flag_end
            };
            int     flag = 0, width = 0, precision = -1, radix = 10;
            char    hex_char = 'a' - 10;
            const char *p_start = s;
            /* flags */
            for (;;)
            {
                switch (*++s)
                {
                case '+':
                    if (s[-1] != ' ')
                        break;
                    flag |= flag_plus;
                    continue;
                case ' ':
                    flag |= flag_blank;
                    continue;
                case '-':
                    flag |= flag_minus;
                    continue;
                case '0':
                    flag |= flag_zero;
                    continue;
                }
                break;
            }
            /* width */
            if (*s == '*')
            {
                ++s, width = va_arg(vlist, int);
                if (width < 0)
                    width = -width, flag |= flag_minus;
            }
            else
            {
                while ((*s >= '0') && (*s <= '9'))
                    width = (width * 10) + *s++ - '0';
            }
            /* precision */
            if (*s == '.')
            {
                ++s, precision = 0;
                if (*s == '*')
                {
                    ++s, precision = va_arg(vlist, int);
                    if (precision < 0)
                        precision = -1;
                }
                else
                {
                    while ((*s >= '0') && (*s <= '9'))
                        precision = (precision * 10) + *s++ - '0';
                }
            }
            /* Options */
            switch (*s)
            {
            case 'h':
                if (*++s != 'h')
                    flag |= flag_h1;
                else
                    ++s, flag |= flag_h2;
                break;
            case 'l':
                if (*++s != 'l')
                    flag |= flag_l1;
                else
                    ++s, flag |= flag_l2;
                break;
            }

            /* type */
            switch (*s)
            {
            case 'd':                 /* signed decimal */
            case 'i':                 /* signed decimal */
                goto put_integer;
            case 'o':                 /* unsigned octal */
                radix = 8;
                flag |= flag_unsigned;
                goto put_integer;
            case 'u':                 /* unsigned decimal */
                flag |= flag_unsigned;
                goto put_integer;
            case 'X':                 /* unsigned hexadecimal */
                hex_char = 'A' - 10;
                goto put_hexadecimal;
            case 'x':                 /* unsigned hexadecimal */
                goto put_hexadecimal;
            case 'p':                 /* pointer */
                /* equal to code warrior */
                flag |= flag_sharp;
                precision = 8;
                goto put_hexadecimal;

            case 'c':                 /* character */
                if (precision >= 0)
                    goto put_invalid;
                {
                    int     c = va_arg(vlist, int);
                    width -= 1;
                    if (flag & flag_minus)
                    {
                        string_put_char(&str, (char)c);
                        string_fill_char(&str, ' ', width);
                    }
                    else
                    {
                        char    pad = (char)((flag & flag_zero) ? '0' : ' ');
                        string_fill_char(&str, pad, width);
                        string_put_char(&str, (char)c);
                    }
                    ++s;
                }
                break;

            case 's':                 /* string */
                {
                    int     n_buf = 0;
                    const char *p_buf = va_arg(vlist, const char *);
                    if (precision < 0)
                    {
                        while (p_buf[n_buf])
                            ++n_buf;
                    }
                    else
                    {
                        while ((n_buf < precision) && p_buf[n_buf])
                            ++n_buf;
                    }
                    width -= n_buf;
                    if (flag & flag_minus)
                    {
                        string_put_string(&str, p_buf, n_buf);
                        string_fill_char(&str, ' ', width);
                    }
                    else
                    {
                        char    pad = (char)((flag & flag_zero) ? '0' : ' ');
                        string_fill_char(&str, pad, width);
                        string_put_string(&str, p_buf, n_buf);
                    }
                    ++s;
                }
                break;

            /* store the number of output */
            // %n can cause security problems, so disable it
/*            case 'n':  
                {
                    int     pos = str.cur - str.base;
                    if (flag & flag_h2)
                        ;
                    else if (flag & flag_h1)
                        *va_arg(vlist, signed short *) = (signed short)pos;
                    else if (flag & flag_l2)
                        *va_arg(vlist, u64 *) = (u64)pos;
                    else
                        *va_arg(vlist, signed int *) = (signed int)pos;
                }
                ++s;
                break;*/

            case '%':                 /* output '%' */
                if (p_start + 1 != s)
                    goto put_invalid;
                string_put_char(&str, *s++);
                break;

            default:                  /* invalid type */
                goto put_invalid;

              put_invalid:
                string_put_string(&str, p_start, s - p_start);
                break;

              put_hexadecimal:
                radix = 16;
                flag |= flag_unsigned;
              put_integer:
                {
                    u64     val = 0;
                    n_prefix = 0;

                    if (flag & flag_minus)
                        flag &= ~flag_zero;
                    if (precision < 0)
                        precision = 1;
                    else
                        flag &= ~flag_zero;

                    if (flag & flag_unsigned)
                    {
                        if (flag & flag_h2)
                            val = (unsigned char)va_arg(vlist, int);
                        else if (flag & flag_h1)
                            val = (unsigned short)va_arg(vlist, int);
                        else if (flag & flag_l2)
                            val = va_arg(vlist, u64);
                        else
                            val = va_arg(vlist, unsigned long);
                        flag &= ~(flag_plus | flag_blank);
                        if (flag & flag_sharp)
                        {
                            if (radix == 16)
                            {
                                if (val != 0)
                                {
                                    prefix[0] = (char)(hex_char + (10 + 'x' - 'a'));
                                    prefix[1] = '0';
                                    n_prefix = 2;
                                }
                            }
                            else if (radix == 8)
                            {
                                prefix[0] = '0';
                                n_prefix = 1;
                            }
                        }
                    }
                    else
                    {
                        if (flag & flag_h2)
                            val = (char)va_arg(vlist, int);
                        else if (flag & flag_h1)
                            val = (short)va_arg(vlist, int);
                        else if (flag & flag_l2)
                            val = va_arg(vlist, u64);
                        else
                            val = va_arg(vlist, long);
                        if ((val >> 32) & 0x80000000)
                        {
                            val = ~val + 1;
                            prefix[0] = '-';
                            n_prefix = 1;
                        }
                        else
                        {
                            if (val || precision)
                            {
                                if (flag & flag_plus)
                                {
                                    prefix[0] = '+';
                                    n_prefix = 1;
                                }
                                else if (flag & flag_blank)
                                {
                                    prefix[0] = ' ';
                                    n_prefix = 1;
                                }
                            }
                        }
                    }
                    n_buf = 0;
                    switch (radix)
                    {
                    case 8:
                        while (val != 0)
                        {
                            int     d = (int)(val & 0x07);
                            val >>= 3;
                            buf[n_buf++] = (char)(d + '0');
                        }
                        break;
                    case 10:
                        if ((val >> 32) == 0)
                        {
#if defined(SDK_CW) || defined(SDK_RX) || defined(__MWERKS__)
#pragma optimize_for_size off
#endif
                            u32     v = (u32)val;
                            while (v != 0)
                            {
                                // If the operation is division of a u32 and a constant, the compiler automatically converts it to addition using magic numbers
                                // 
                                u32     r = v / 10;
                                int     d = (int)(v - (r * 10));
                                v = r;
                                buf[n_buf++] = (char)(d + '0');
                            }
                        }
                        else
                        {
                            while (val != 0)
                            {
                                u64     r = val / 10;
                                int     d = (int)(val - (r * 10));
                                val = r;
                                buf[n_buf++] = (char)(d + '0');
                            }
                        }
                        break;
                    case 16:
                        while (val != 0)
                        {
                            int     d = (int)(val & 0x0f);
                            val >>= 4;
                            buf[n_buf++] = (char)((d < 10) ? (d + '0') : (d + hex_char));
                        }
                        break;
                    }
                    if ((n_prefix > 0) && (prefix[0] == '0'))
                    {
                        n_prefix = 0;
                        buf[n_buf++] = '0';
                    }
                }
                goto put_to_stream;

              put_to_stream:
                {
                    int     n_pad = precision - n_buf;
                    if (flag & flag_zero)
                    {
                        if (n_pad < width - n_buf - n_prefix)
                            n_pad = width - n_buf - n_prefix;
                    }
                    if (n_pad > 0)
                        width -= n_pad;
                    width -= n_prefix + n_buf;
                    if (!(flag & flag_minus))
                        string_fill_char(&str, ' ', width);
                    while (n_prefix > 0)
                        string_put_char(&str, prefix[--n_prefix]);
                    string_fill_char(&str, '0', n_pad);
                    while (n_buf > 0)
                        string_put_char(&str, buf[--n_buf]);
                    if (flag & flag_minus)
                        string_fill_char(&str, ' ', width);
                    ++s;
                }
                break;
            }
        }
    }

    if (str.len > 0)
    {
        *str.cur = '\0';
    }
    else if (len > 0)
    {
        str.base[len - 1] = '\0';
    }
    return str.cur - str.base;
}