藍色情懷

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/*
This article was contributed by Jacky Xie.
Environment: VC6,BCB1/3/4/5/6,Linux
*/
// static functions implementation to operate with project- relative file
// names an include might be needed if not specified already somewhere


// ===============================================================
// 將ipv4字串轉換成ipv4數值格式
// ===============================================================

//---------------------------------------------------------------------------
#include <stdio.h> 
#include <string.h>
#include <stdlib.h>

#pragma hdrstop

//---------------------------------------------------------------------------
#pragma argsused
#ifndef CHAR
#define CHAR   char
#endif
typedef unsigned long u_long;
typedef unsigned char   u_char;
typedef unsigned short  u_short;

/*
typedef struct in_addr
{
    u_long  s_addr;
} in_addr;
*/
typedef struct in_addr {
        union 
        {
                struct  { u_char s_b1,s_b2,s_b3,s_b4; } S_un_b;
                struct  { u_short s_w1,s_w2; } S_un_w;
                u_long  S_addr;
#define s_addr  S_un.S_addr   /* can be used for most tcp & ip code */                
        } S_un;
} in_addr;

int ip_atoi(CHAR* argv, CHAR* ip)
{
	int   i;
	int   value;
	CHAR  tmp_ip[4];

	for (i = 0; i < 4; i++)
	{
		value = atoi(argv);

		if (value >255)
			return -1;

		tmp_ip[i] = (CHAR)value;

		if (((argv = strchr(argv, '.')) == NULL) && (i < 3))
			return -1;

		argv++; 
	}

	for (i = 0; i < 4; i++)
                ip[i] = tmp_ip[3 - i];

    return i;   
}


int inet_aton(char *a, struct  in_addr *b)
{
    int     value=0;
    char    c_ip[4];
 
 
    memset(c_ip, 0, 4);

    value = ip_atoi(a, c_ip);
 
    memcpy((char *)&b->s_addr, c_ip, 4);
 
    if(value < 4)
        return 0;
    else
        return 1;
}

int Check_IP(char* str)
{
    int   i;
    int   ip[4];
    char  tmp[16];

    if (!str)
        return 0;

    if (sscanf(str, "%d.%d.%d.%d%s", &ip[0], &ip[1], &ip[2], &ip[3], tmp) != 4)
	return 0;

    for (i = 0; i <= 3; i++)
    {
	if (ip[i] < 0 || ip[i] > 255)
		return 0;
    }

    return 1;
}

void checkip_help_cmd(void)
{
    printf("nShow checkip commands:n");
    printf("    checkip [ip-addr]n");
}

// ===============================================================
// example of the function use
// ===============================================================
int main(int argc, char* argv[])
{
        unsigned char* ip = "234.53.198.76";
        in_addr ipaddr;
        inet_aton(ip,&ipaddr);
        printf("%d.%d.%d.%dn",ipaddr.S_un.S_un_b.s_b4,ipaddr.S_un.S_un_b.s_b3,
                               ipaddr.S_un.S_un_b.s_b2,ipaddr.S_un.S_un_b.s_b1);
        system("pause");

	// =======================
	// 檢驗 ip-addr 是否符合 ipv4 格式
	// =======================
        if(argc<2)
    	{
       		checkip_help_cmd();
       		return 0;
    	}
    	if (!Check_IP(argv[1]))
    	{
    		printf("IP Address is invalid !!!n");
    	}
    	else
    	{
        	printf("IP Address is valid !!!n");
    	}
    	getch();
        system("pause");

        return 0;
}
//---------------------------------------------------------------------------