netutil.c

单片机tcpip_c51源程序.rar

/* Network utility functions for 'TCP/IP Lean' (c) Iosoft Ltd. 2000  */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "ethernet.h"
#include "netutil.h"
#define MACLEN     6
#define BCASTADDR     0xff,0xff,0xff,0xff,0xff,0xff     // broadcast address
BYTE bcast[MACLEN]={BCASTADDR}; 

/* Convert IP address into a string */
char *ipstr(LWORD ip, char *s)
{
    sprintf(s, "%lu.%lu.%lu.%lu",(ip>>24)&255,(ip>>16)&255,(ip>>8)&255,ip&255);
    return(s);
}

/* Convert Ethernet address into a string (max 17 chars plus null) */
char *ethstr(BYTE *addr, char *str)
{
    int i;
    char *s=str;

    if (!memcmp(addr, bcast, MACLEN))
        strcpy(s, "----BROADCAST----");
    else for (i=0; i<MACLEN; i++)
        s += sprintf(s, i>0 ? ":%02x" : "%02x", *addr++);
    return(str);
}

/* Convert string to IP addr: first digits form most-significant byte  */
LWORD atoip(char *str)
{
    LWORD ip=0L;
    int i=4, n;
    char c=1;

    while (--i>=0 && c)
    {
        n = 0;
        while (isdigit(c=*str++))
            n = n*10 + c-'0';
        ip += (LWORD)n << (i*8);
    }
    return(ip);
}


/* Check the given token is at the start of the string
** Return pointer to the first char after the token, 0 if token not found */
char *skiptoken(char *str, char *tok)
{
    int n;
    char *s=0;

    n = strlen(tok);
    if (n>0 && str && !strncmp(str, tok, n))
        s = str + n;
    return(s);
}

/* Return a pointer to the first char after any whitespace */
char *skipspace(char *str)
{
    while (isspace(*str))
        str++;
    return(str);
}

/* Return a pointer to the first char after any whitespace or punctuation */
char *skippunct(char *str)
{
    while (isspace(*str) || ispunct(*str))
        str++;
    return(str);
}

/* Check whether a sequence value lies within two others, return 0 if not */
int in_limits(LWORD val, LWORD lo, LWORD hi)
{
    long lodiff, hidiff;

    lodiff = val - lo;
    hidiff = hi - val;
    return(lodiff>=0 && hidiff>=0);
}
/* Print a hex dump of a buffer */
void hexdump(BYTE *buff, WORD len)
{
    BYTE c, str[17];
    WORD j, n=0;
    while (n < len)                /* For each line of 16 bytes... */
    {
        printf("  %04x:", n);
        for (j=0; j<16; j++)                /* For each byte of 16... */
        {
            printf("%c", j==8 ? '-':' ');   /* Put '-' after 8 bytes */
            if (n++ >= len)                 /* If no bytes left... */
            {
                printf("  ");               /* Fill out space */
                str[j] = 0;
            }
            else                            /* If bytes left... */
            {
                printf("%02x", c = *buff++);/* Print byte value */
                str[j] = c>=' '&&c<='~' ? c : '.';
            }                               /* Save char if valid */
        }
        str[j] = 0;                        /* Print char string */
        printf("  %s\n", str);
    }
}


/* EOF */