/* $Id: kLdrHlpStr.c 2955 2007-02-07 07:07:16Z bird $ */
/** @file
 *
 * kLdr - The Dynamic Loader, String Helper Functions.
 *
 * Copyright (c) 2006 knut st. osmundsen <bird-kbuild-src@anduin.net>
 *
 *
 * This file is part of kLdr.
 *
 * kLdr is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * kLdr is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with kLdr; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */


/*******************************************************************************
*   Header Files                                                               *
*******************************************************************************/
#include <kLdr.h>
#include "kLdrHlp.h"


/**
 * Converts an signed integer to an ascii string.
 *
 * @returns psz.
 * @param   psz         Pointer to the output buffer.
 * @param   cch         The size of the output buffer.
 * @param   lVal        The value.
 * @param   iBase       The base to format it. (2,8,10 or 16)
 */
char *kldrHlpInt2Ascii(char *psz, size_t cch, long lVal, unsigned iBase)
{
    static const char s_szDigits[] = "0123456789abcdefghijklmnopqrstuvwxyz";
    char *pszRet = psz;

    if (cch >= (lVal < 0 ? 3U : 2U) && psz)
    {
        /* prefix */
        if (lVal < 0)
        {
            *psz++ = '-';
            cch--;
            lVal = -lVal;
        }

        /* the digits */
        do
        {
            *psz++ = s_szDigits[lVal % iBase];
            cch--;
            lVal /= iBase;
        } while (lVal && cch > 1);

        /* overflow indicator */
        if (lVal)
            psz[-1] = '+';
    }
    else if (!pszRet)
        return pszRet;
    else if (cch < 1 || !pszRet)
        return pszRet;
    else
        *psz++ = '+';
    *psz = '\0';

    return pszRet;
}


size_t  kLdrHlpStrNLen(const char *psz, size_t cchMax)
{
    const char * const pszStart = psz;
    while (*psz && cchMax--)
        psz++;
    return psz - pszStart;
}


int     kLdrHlpMemIComp(const void *pv1, const void *pv2, size_t cb)
{
    const uint8_t *pb1 = (const uint8_t *)pv1;
    const uint8_t *pb2 = (const uint8_t *)pv2;
    while (cb-- > 0)
    {
        if (*pb1 != *pb2)
        {
            const uint8_t u1 = *pb1 >= 'a' && *pb1 <= 'z' ? *pb1 - 'a' : *pb1;
            const uint8_t u2 = *pb2 >= 'a' && *pb2 <= 'z' ? *pb2 - 'a' : *pb2;
            if (u1 != u2)
                return (int)*pb1 - (int)*pb2;
        }
        pb1++;
        pb2++;
    }
    return 0;
}


int     kLdrHlpStrIComp(const char *pv1, const char *pv2)
{
    const uint8_t *pb1 = (const uint8_t *)pv1;
    const uint8_t *pb2 = (const uint8_t *)pv2;
    for (;;)
    {
        if (*pb1 != *pb2)
        {
            const uint8_t u1 = *pb1 >= 'a' && *pb1 <= 'z' ? *pb1 - 'a' : *pb1;
            const uint8_t u2 = *pb2 >= 'a' && *pb2 <= 'z' ? *pb2 - 'a' : *pb2;
            if (u1 != u2)
                return (int)*pb1 - (int)*pb2;
        }
        if (!*pb1)
            break;
        pb1++;
        pb2++;
    }
    return 0;
}


#ifdef kLdrHlpStrChr_needed
char   *kLdrHlpStrChr(const char *psz, int ch)
{
    while (*psz)
    {
        if (*psz == ch)
            return (char *)psz;
        psz++;
    }
    return NULL;
}
#endif


#ifdef kLdrHlpMemChr_needed
void   *kLdrHlpMemChr(const void *pv, int ch, size_t cb)
{
    const uint8_t *pb = (const uint8_t *)pv;
    const uint8_t  b = (uint8_t)ch;
    while (cb-- > 0)
    {
        if (*pb == b)
            return (void *)pb;
        pb++;
    }
    return NULL;
}
#endif


#ifdef kLdrHlpMemMove_needed
void   *kLdrHlpMemMove(void *pv1, const void *pv2, size_t cb)
{
    uint8_t        *pbDst = (uint8_t *)pv1;
    const uint8_t  *pbSrc = (const uint8_t *)pv2;
    while (cb-- > 0)
    {
        const uint8_t b = *pbSrc++;
        *pbDst++ = b;
    }
    return pv1;
}
#endif


#ifdef kLdrHlpStrNComp_needed
int     kLdrHlpStrNComp(const char *psz1, const char *psz2, size_t cch)
{
    while (cch-- > 0)
    {
        if (*psz1 != *psz2)
            return (int)*psz1 - (int)*psz2;
        if (!*psz1)
            break;
        psz1++;
        psz2++;
    }
    return 0;
}
#endif