nm_common.c

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#include "common/include/nm_common.h"

void m2m_memcpy(uint8* pDst,uint8* pSrc,uint32 sz)
{
        if(sz == 0) return;
        do
        {
                *pDst = *pSrc;
                pDst++;
                pSrc++;
        }while(--sz);
}
uint8 m2m_checksum(uint8* buf, int sz)
{
        uint8 cs = 0;
        while(--sz)
        {
                cs ^= *buf;
                buf++;
        }

        return cs;
}

void m2m_memset(uint8* pBuf,uint8 val,uint32 sz)
{
        if(sz == 0) return;
        do
        {
                *pBuf = val;
                pBuf++;
        }while(--sz);
}

uint16 m2m_strlen(uint8 * pcStr)
{
        uint16  u16StrLen = 0;
        while(*pcStr)
        {
                u16StrLen ++;
                pcStr++;
        }
        return u16StrLen;
}

uint8 m2m_strncmp(uint8 *pcS1, uint8 *pcS2, uint16 u16Len)
{
    for ( ; u16Len > 0; pcS1++, pcS2++, --u16Len)
        if (*pcS1 != *pcS2)
            return ((*(uint8 *)pcS1 < *(uint8 *)pcS2) ? -1 : +1);
        else if (*pcS1 == '\0')
            return 0;
    return 0;
}

/* Finds the occurance of pcStr in pcIn.
If pcStr is part of pcIn it returns a valid pointer to the start of pcStr within pcIn.
Otherwise a NULL Pointer is returned.
*/
uint8 * m2m_strstr(uint8 *pcIn, uint8 *pcStr)
{
    uint8 u8c;
    uint16 u16StrLen;

    u8c = *pcStr++;
    if (!u8c)
        return (uint8 *) pcIn;  // Trivial empty string case

    u16StrLen = m2m_strlen(pcStr);
    do {
        uint8 u8Sc;

        do {
            u8Sc = *pcIn++;
            if (!u8Sc)
                return (uint8 *) 0;
        } while (u8Sc != u8c);
    } while (m2m_strncmp(pcIn, pcStr, u16StrLen) != 0);

    return (uint8 *) (pcIn - 1);
}

sint8 m2m_memcmp(uint8 *pu8Buff1,uint8 *pu8Buff2 ,uint32 u32Size)
{
        uint32  i;
        sint8           s8Result = 0;
        for(i    = 0 ; i < u32Size ; i++)
        {
                if(pu8Buff1[i] != pu8Buff2[i])
                {
                        s8Result = 1;
                        break;
                }
        }
        return s8Result;
}