sdcard

#include <SD.h>
#include <SPI.h>
#include <Ethernet.h>
int i = 0;
int j = 0;                              // array pointer:
char chtr;                                  // variable to hold value from file:
char name[4];                                   // array for name data:
char value[8];

byte     mac[]   = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
byte     ip[]    = {10, 0, 0, 59};
// set up variables using the SD utility library functions:
Sd2Card card;
int SD_CS = 4;


void setup() {

    Serial.begin(9600);

    // disable w5100 SPI while setting up SD

    digitalWrite(10,HIGH);  // Disabled

    Serial.print("Starting SD...");
    pinMode(10,OUTPUT);
    if(!SD.begin(4)) Serial.println("SD failed to start");
    else Serial.println("ok");
    // SD.begin() returns with its SPI disabled. Good SD library!
    if (!card.init(SPI_HALF_SPEED, SD_CS)) {
        Serial.println("Initialization Failed.");

    } else {
        Serial.println("Wiring is correct and a card is present.");
    }


    delay (2000);

    Serial.print("Starting w5100...");
    Serial.println();

    readFile();

    Ethernet.begin(mac, ip);
    Serial.println();
    Serial.print("Arduino set IP to ");
    Serial.println();
    Serial.println(Ethernet.localIP());


    // rest of your setup
}

void loop(){}


void readFile() {

    File file;
    file=SD.open("params.txt");
    if (file) {
        // array for value data:
        while (file.available()) {              // read the settings file:
            i = 0;
            boolean paramEnd = false;
            while (!paramEnd) {             // while not at the end of the parameter keep reading:
                chtr = file.read();
                if (chtr != ':') {          // if the char from file is not a':' read it in:
                    name[i] = chtr;
                    i++;
                } else {
                    paramEnd = true;                   // otherwise we have come to the end of our parmeter name:
                }
            }
            j = 0;
            boolean valueEnd = false;
            value[0] = '\0';                               // reset our array pointer:
            while (!valueEnd) {
                chtr = file.read();
                if (chtr != ',') {          // if the char from file is not a ',' read it in:
                    value[j] = chtr;
                    j++;
                } else {
                    valueEnd = true;        // otherwise we have come to the end of our value:
                }
            }
            if (!strcmp(name, "ip0")) {
                ip[0] = atoi(value);                     // assign value to ip0 first ip octet:
            }
            if (!strcmp(name, "ip1")) {
                ip[1] = atoi(value);                     // assign value to ip1 first ip octet:

            }
            if (!strcmp(name, "ip2")) {
                ip[2] = atoi(value);                     // assign value to ip2 first ip octet:

            }
            if (!strcmp(name, "ip3")) {
                ip[3] = atoi(value);                     // assign value to ip4 first ip octet:

            }
        }
    }
}