LinuxQuestions.org - structure inside a structure in C

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structure inside a structure in C

Pls help me with this programm..

Code:

#include<stdio.h>

#include<sys/socket.h>

#include<netinet/in.h>

#include<string.h>

#include<stdlib.h>





#define BUFFSIZE 256

#define SMALL_SIZE 16

#define MED_SIZE 64

#define MAX  16

#define PORT 5555



char buffer[BUFFSIZE];



struct students

{

    int n;

    char Name[MED_SIZE];

    char Status[SMALL_SIZE];

};



struct Sending{

    int seqno;

    struct students class;

    struct Sending *next;



};

int main(){

    struct Sending *snd=NULL;

//  struct students *td =NULL;

//  char buf[BUFFSIZE] = "\0";

    snd = (struct Sending *)malloc(sizeof(struct Sending));



    memset(snd.class,0,sizeof(struct students));

    strcpy(snd.class->Name ,"PRIYA");

    printf("%s\n" ,snd.class->Name );

}

memset(snd.class,0,sizeof(struct students));
this line will segfault because snd.class is not initialized. malloc some memory before usage

'snd' is a pointer, so it won't compile on the first place

Code:

...



    memset(snd->class,0,sizeof(struct students));

    strcpy(snd->class.Name ,"PRIYA");

    printf("%s\n" ,snd->class.Name );



...

Avoid strcpy(); use strncpy() instead to avoid the possibility of overrunning a buffer.