new_ip.c

来自「mcf5307实验源代码」· C语言 代码 · 共 408 行 · 第 1/2 页

/*  AUTHOR                                                              */
/*                                                                      */
/*      B. Harwell,  Accelerated Technology                             */
/*                                                                      */
/*  HISTORY                                                             */
/*                                                                      */
/*      created - 12/21/92                                              */
/*                                                                      */
/*  CALLED FROM                                                         */
/*                                                                      */
/*      PROTINIT.C                                                      */
/*      TCP.C                                                           */
/*      SOCKETS.C                                                       */
/*      TOOLS.C                                                         */
/*                                                                      */
/*  ROUTINES CALLED                                                     */
/*                                                                      */
/*      N/A                                                             */
/*                                                                      */
/*  INPUTS                                                              */
/*                                                                      */
/*      number                   long number to be byte swapped         */
/*                                                                      */
/*  OUTPUTS                                                             */
/*                                                                      */
/*      return_value             the input value after being byteswapped*/
/*                                                                      */
/************************************************************************/
uint32 longswap(uint32 number)
{
#ifdef SWAPPING
    uint8 *new, *org;
    uint32 return_value = 0;

    org = (uint8 *)&number;
    new = (uint8 *)&return_value;

    /* swap the bytes one at time */
    new[0] = org[3];
    new[1] = org[2];
    new[2] = org[1];
    new[3] = org[0];

    return(return_value);
#else
    return(number);
#endif  /* SWAPPING */
}
#endif /* !(LONGSWAP_ASM) */

#if !(INTSWAP_ASM)
/************************************************************************/
/*                                                                      */
/*  FUNCTION                                "intswap"                   */
/*                                                                      */
/*                                                                      */
/*  DESCRIPTION                                                         */
/*                                                                      */
/*      This function swaps 2 bytes of a number.                        */
/*                                                                      */
/*  AUTHOR                                                              */
/*                                                                      */
/*      B. Harwell,  Accelerated Technology                             */
/*                                                                      */
/*  HISTORY                                                             */
/*                                                                      */
/*      created - 12/21/92                                              */
/*                                                                      */
/*  CALLED FROM                                                         */
/*                                                                      */
/*      PROTINIT.C                                                      */
/*      TCP.C                                                           */
/*      SOCKETS.C                                                       */
/*      NET.C                                                           */
/*      UDP.C                                                           */
/*      DNS.C                                                           */
/*      IP.C                                                            */
/*      USER.C                                                          */
/*      ARP.C                                                           */
/*                                                                      */
/*  ROUTINES CALLED                                                     */
/*                                                                      */
/*      N/A                                                             */
/*                                                                      */
/*  INPUTS                                                              */
/*                                                                      */
/*      number                   number to be byte swapped              */
/*                                                                      */
/*  OUTPUTS                                                             */
/*                                                                      */
/*      return_value             the input value after being byteswapped*/
/*                                                                      */
/************************************************************************/
uint16 intswap (uint16 number)
{
#ifdef SWAPPING
    uint8 *new, *org;
    uint16 return_value = 0;

    org = (uint8 *)&number;
    new = (uint8 *)&return_value;

    /* swap the bytes in the int16 */
    new[0] = org[1];
    new[1] = org[0];
/*    return_value  = ((number & 0x00FF)<< 8);*/
/*    return_value += ((number & 0xFF00)>> 8);*/

    return(return_value);
#else
    return (number);
#endif /* SWAPPING */
}
#endif /* !(INTSWAP_ASM) */

#if !(COMPAREN_ASM)
/************************************************************************/
/*                                                                      */
/*  FUNCTION                                "comparen"                  */
/*                                                                      */
/*                                                                      */
/*  DESCRIPTION                                                         */
/*                                                                      */
/*      This function compares 2 strings for equality.                  */
/*                                                                      */
/*  AUTHOR                                                              */
/*                                                                      */
/*      B. Harwell,  Accelerated Technology                             */
/*                                                                      */
/*  HISTORY                                                             */
/*                                                                      */
/*      created - 12/21/92                                              */
/*                                                                      */
/*  CALLED FROM                                                         */
/*                                                                      */
/*      IP.C                                                            */
/*      ARP.C                                                           */
/*      EQUEUE.C                                                        */
/*      CONFILE.C                                                       */
/*      UDP.C                                                           */
/*      BOOTP.C                                                         */
/*      PROTINIT.C                                                      */
/*      TOOLS.C                                                         */
/*      UTIL.C                                                          */
/*                                                                      */
/*  ROUTINES CALLED                                                     */
/*                                                                      */
/*      N/A                                                             */
/*                                                                      */
/*  INPUTS                                                              */
/*                                                                      */
/*      s1                       Pointer to the first input string      */
/*      s2                       Pointer to the second input string     */
/*      len                      Length of characters to compare        */
/*                                                                      */
/*  OUTPUTS                                                             */
/*                                                                      */
/*      return_value             Equality indicator :                   */
/*                            return 0 if strings 1 and 2 are not equal */
/*                            return 1 if strings 1 and 2 are equal     */
/*                                                                      */
/************************************************************************/
int16 comparen (VOID *s1, VOID *s2, int16 len)
{
    return (!memcmp ((void *)s1, (void *)s2, (uint16)len));
}
#endif /* !(COMPAREN_ASM) */

int32 n_clicks()
{

#ifdef PLUS
    UNSIGNED    current_time;
    current_time = NU_Retrieve_Clock();
#else
    long current_time;   /* TBV - I just changed this from int to long */
    current_time = NU_Read_Time();
#endif

    return ((long)current_time);
}

void init_time()
{
#ifdef PLUS
    UNSIGNED t;
#else
    long t;
#endif

#ifdef MSC
    t = (uint32)time (NU_NULL);
#else
    t = NU_TCP_Time ((uint32 *)NU_NULL);
#endif

#ifdef PLUS
    NU_Set_Clock((UNSIGNED) (t & 0x7FFF));
#else
    NU_Set_Time((unsigned int) (t & 0x7FFF));
#endif
} /* end init_time */