Programming

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#define SIZE 50
char *domain1 = "com";
char *domain2 = "co.in";
char *domain3 = "org";
char *domain4 = "net";
char *domain5 = "in";
char *domain6 = "org.net";
static bool f_valid = 0;
bool matchURL(char *url, FILE *fp)
{
        int j = 0;
        int k = 0;
        char buff[SIZE]; 
        char *token1;
        char token2[SIZE] = {0};
        char token3[SIZE] = {0};
        char *delimeter = ".";

        token1 = strtok(url,delimeter);
 
        while ((fscanf(fp,"%s",buff)) != EOF)
        {
                if(0 == strcmp(buff,token1))
                {
                        f_valid = 1;
                }
                else
                {
                        f_valid = 0;
                }
        }
 
        j = 1 + strlen(token1);
 
        if (1 == f_valid) 
        { 
                while(url[j] != '.')
                {
                        token2[k] = url[j];
                        j++;
                        k++;
                }
        }
 
        if ((0 == strlen(token2)) || (0 == strcmp("www",token2)))
        {
                f_valid = 0;
        }
 
        j = 2 + (strlen(token1)+strlen(token2));
 
        k = 0;
 
        while(url[j] != '\0')
        {
                token3[k] = url[j];
                j++;
                k++;
        } 
 
        if(1 == f_valid)
        {
                if((0 == strcmp(domain1,token3)) || (0 == strcmp(domain2,token3)) || (0 == strcmp(domain3,token3)) || (0 == strcmp(domain4,token3)) || (0 == strcmp(domain5,token3)) || (0 == strcmp(domain6,token3)))
                {
                        f_valid = 1;
                }
                else 
                {
                        f_valid = 0;
                } 
        }
 
        return f_valid;
}

int main ()
{ 
        int i = 0;
        char url[SIZE];
        FILE *fp;

        if ((fp=fopen("Dictionary", "r")) == NULL)
        {
                printf("Can't Validate\tDictionary File is missing\n");
                return -1;
        }

        printf("Enter the URL to Validate :\n");
        scanf("%s",url);

        for(i; i < strlen(url); i++)
        {
        if ((url[i] == '@') || (url[i] == '!') || (url[i] == '#') || (url[i] == '$') || (url[i] == '%') || (url[i] == '^') || (url[i] == '&') || (url[i] == '*') || (url[i] == '(') || (url[i] == ')') || (url[i] == '\t') || (url[i] == '\b') || (url[i] == '\n'))
        {
                printf("Invaild URL\nSpecial Character Found!\n");
                return -1;
        }
}

        if ( 1 == matchURL(url,fp))
        {
                printf("Valid URL address\n");
        }
        else
                printf ("Invalid URL address\n");
 
        fclose(fp);
        return 0;
 
}

int url_specialchars(const char *url)
{
        // The compiler will stack "multiple" "strings" "end" "to" "end"
        // into "multiplestringsendtoend", so we don't need one giant line.
        static const char *nospecial="0123456789"
                "abcdefghijklmnopqrstuvwxyz"
                "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
                ".";

        while(*url) // Loop until (*url) == 0.  (*url) is about equivalent to url[0].
        {
                // Can we find the character at *url in the string 'nospecial'?
                // If not, it's a special character and we should return 0.
                if(strchr(nospecial, *url) == NULL) return(0);
                url++; // Jump to the next character.  Adding one to a pointer moves it ahead one element.
        }

        return(1); // Return 1 for success.
}