/*
 * strncpy.c
 *
 *  Copy one string to another.
 *  Correctly terminate the new string and do not exceed its bounds.
 */


#include <stdio.h>


/* Copy src into dst; return the number of characters copied */
int
strncpy(char dst[], const char src[], int dst_size)
{
    int i;

    for (i=0; src[i] != '\0' && i < dst_size-1; i++) {
        dst[i] = src[i];
    }

    dst[i] = '\0';

    return i;
}


int
main()
{
    char from1[20] = "";
    char from2[5]  = "";
    char to[10];
    int char_copied;

    printf("Enter a string: \n");
    fgets(from1, 20, stdin);
    char_copied = strncpy(to, from1, sizeof(to));
    printf("%d characters copied; the destination string is: %s\n",
           char_copied, to);

    printf("Enter a string: \n");
    fgets(from2, 5, stdin);
    char_copied = strncpy(to, from2, sizeof(to));
    printf("%d characters copied; the destination string is: %s\n",
           char_copied, to);

    return 0;
}