/*******************************************************************************
 * Project Name :
 *
 * Version : 1.0
 * Copyright (c) 2009 : Ohyung ( ohyung@ohyung.com )
 * Last modified at : 2009.01.23
 * *****************************************************************************/


/*******************************************************************************
 *                Include
 ******************************************************************************/
#include "stdio.h"
#include "stdlib.h"


/*******************************************************************************
 *                Define
 ******************************************************************************/

#define PRINTLINE() printf("--------------------------------------------------\n");


/*******************************************************************************
 *                Code
 ******************************************************************************/
void myprint(char* buff, int max)
{
    int i = 0;
    while(max)
    {
        printf("%c",buff[i++]);
        max--;
    }
    printf("\n");
}

#include "string.h"
// mystrcpy
// char* strcpy(char* dest, const char* src);

char* mystrcpy(char* dest, const char* src)
{
   int i = 0;
   while (src[i] != '\0')
   {
      dest[i] = src[i];
      i++;
   }
   dest[i] = '\0';

    return &dest[0];
}

char* mystrncpy(char* dest, const char* src, size_t maxlen)
{
   int i = 0;
   while (src[i] != '\0' && i < maxlen)
   {
      dest[i] = src[i];
      i++;
   }
   while(i < maxlen)
   {
       dest[i] = '\0';
       i++;
   }

    return &dest[0];
}

int main(void)
{
    char buff_a[50] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    char buff_b[20] = "abcdefghijklmnopq";

    char buff_at[50] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    char buff_bt[20] = "abcdefghijklmnopq";

    char* result = 0;

    printf("origin a : %s \n", buff_a);
    printf("origin b : %s \n", buff_b);
    printf("origin &a or &c : %X , %X \n", &buff_a, &buff_b);
    //printf("origin sizeof(a): %d  sizeof(b): %d \n", sizeof(buff_a), sizeof(buff_b));

    PRINTLINE();
    result = strcpy(buff_a, buff_b);
    printf("a : %s \n", buff_a);
    printf("b : %s \n", buff_b);
    printf("&a: %X \n", result);
    memcpy(buff_a, buff_at, strlen(buff_a));
    memcpy(buff_b, buff_bt, strlen(buff_b));

    PRINTLINE();
    result = mystrcpy(buff_a, buff_b);
    printf("a : %s \n", buff_a);
    printf("b : %s \n", buff_b);
    printf("&a: %X \n", result);
    memcpy(buff_a, buff_at, strlen(buff_a));
    memcpy(buff_b, buff_bt, strlen(buff_b));

    PRINTLINE();
    result = strncpy(buff_a, buff_b, 30);
    printf("a : %s \n", buff_a);
    printf("b : %s \n", buff_b);
    printf("&a: %X \n", result);
    myprint(buff_a, 50);
    memcpy(buff_a, buff_at, strlen(buff_a));
    memcpy(buff_b, buff_bt, strlen(buff_b));


    PRINTLINE();
    result = mystrncpy(buff_a, buff_b, 30);
    printf("a : %s \n", buff_a);
    printf("b : %s \n", buff_b);
    printf("&a: %X \n", result);
    myprint(buff_a, 50);

   return 0;
}
#endif