//+----------------------------------------------------------------------------
//
// File:     string.c
//
// Module:   
//
// Synopsis: 
//
// Copyright (C) 2003 Scott Gasch
//
// Created:  sgasch  5 Jul 2003
//
//+----------------------------------------------------------------------------

#include "kernel.h"

CHAR *
strncpy(CHAR *pDest, CHAR *pSrc, SIZE_T u)
{
    char *p = pDest;
    ULONG v = 0;

    while ((v < u) && (*pSrc))
    {
        *pDest = *pSrc;
        pDest++; pSrc++; v++;
    }

    //
    // If we ran out of space, null terminate the dest buffer
    //
    if ((*pSrc) && (u > 0))
    {
        *(pDest - 1) = 0;
    }
    
    return(p);
}

SIZE_T
strlen(CHAR *p)
{
    ULONG i = 0;
    while(*p)
    {
        i++;
        p++;
    }
    return(i);
}

CHAR *
RtlIntToAscii(INT i,
              CHAR *buf,
              ULONG uBufLen,
              ULONG uBase)
{
    CHAR *p = (buf + uBufLen);
    ULONG uSpaceLeft = uBufLen;
    ULONG uMagnitude;
    BOOL fNeg = FALSE;

    //
    // null terminate the workspace buffer
    //
    if (uSpaceLeft == 0) 
    {
        return(NULL);
    }
    *p = '\0';
    p--;
    uSpaceLeft--;

    //
    // Get the int's sign
    //
    if (i < 0)
    {
        fNeg = TRUE;
        uMagnitude = -i;
    }
    else
    {
        uMagnitude = i;
    }
    
    //
    // Based on base, do the conversion.  Build the string backwards from
    // less significant digits.  Stop if we finish or if we run out of
    // uSpaceLeft.
    //
    switch(uBase)
    {
        case 10:
            do
            {
                *p = (uMagnitude % 10) + '0';
                p--;
                uSpaceLeft--;
                uMagnitude /= 10;
            } 
            while((uSpaceLeft > 0) && (uMagnitude != 0));
            break;
        case 16:
            do
            {
                *p = "0123456789ABCDEF"[uMagnitude & 15];
                p--;
                uSpaceLeft--;
                uMagnitude >>= 4;
            } 
            while((uSpaceLeft > 0) && (uMagnitude != 0));
            break;
        case 8:
            do 
            {
                *p = (uMagnitude & 7) + '0';
                p--;
                uSpaceLeft--;
                uMagnitude >>= 3;
            } 
            while((uSpaceLeft > 0) && (uMagnitude != 0));
            break;
    }

    if (TRUE == fNeg)
    {
        if (uSpaceLeft > 0)
        {
            *p = '-';
        }
    }
    else
    {
        p++;
    }
    return(p);
}