server.c - shared from CS50 IDE

server.c

/**
 * Parses a request-line, storing its absolute-path at abs_path 
 * and its query string at query, both of which are assumed
 * to be at least of length LimitRequestLine + 1.
 */
bool parse(const char* line, char* abs_path, char* query)
{
    int length = strlen(line);
    char buffer[length +  1];
    strcpy(buffer, line);
    int space_ctr = 0;
    int spec_char_ctr = 0;
    int j = 0;
    while(j < length+1)
    {
        if (buffer[j] == ' ')
        {
            space_ctr++;
            if(buffer[j+1] == ' ')
            {
                error(400);
                return false;
            }
        }
        if (buffer[j] == '\r' && buffer[j+1] == '\n')
        {
            spec_char_ctr++;
            break;
        }
        j++;
    }
    if (space_ctr != 2)
    {
        error(400);
        return false;
    }
    if (spec_char_ctr != 1)
    {
        error(400);
        return false;
    }
    //ensure correct method is used
    if(buffer[0] != 'G' || buffer[1] != 'E' || buffer[2] != 'T' || buffer[3] !=' ')
    {
        error(405);
        return false;
    }
    //ensure that request-target starts with a /
    if (buffer[4] != '/')
    {
        error(501);
        return false;
    }
    
    //ensure on quotation marks(") in the request-target
    int i = 4;
    while (buffer[i] != ' ')
    {
        if (buffer[i] == '\"')
        {
            error(400);
            return false;
        }
        i++;
    }
    
    char* http_add = strrchr(buffer, 32);
    if (http_add[1] !='H' || http_add[2] != 'T' || http_add[3] != 'T' || http_add[4] != 'P' || http_add[5] != '/' || 
    http_add[6] != '1' || http_add[7] != '.' || http_add[8] != '1' || http_add[9] != '\r' || http_add[10] != '\n')
    {
        error(505);
        return false;
    }
    
    int k = 4; 
    char buffer2[strlen(line) + 1];
    char buffer3[strlen(line) + 1];
    int indic = 0;
    int when = 0;
    while(buffer[k] != ' ')
    {
       if (buffer[k] == '?' && indic == 0)
       {
           indic = 1;
       }
       else if ( indic == 0)
       {
           buffer2[k-4] = buffer[k];
       }
       else
       {
           buffer3[when] = buffer[k];
           when++;
       }
       k++; 
    }
    
    buffer2[k - 2 - when] = '\0';
    buffer3[when] = '\0';
    
    strcpy(abs_path, buffer2);
    if (indic == 1)
    {
        strcpy(query , buffer3);
    }
    else
    {
        query[0] = '\0';
    }
    return true;
}