Problem in writing string to File

Hi ,

I am writing a code for writing a whole string to file,but it is running in infinte loop ??
Means the final string is written infinte times.

The code is:

Code:

---


#include<stdio.h>
#include<stdlib.h>
#include<string.h>


typedef struct file
{
  char send_mail[20];
  char smtp[20];
  char to[50];
  char from[50];
};

int main()
{
  file *ptr;
  FILE *fptr;
  ptr = (struct file *)malloc(sizeof(file));


  strcpy(ptr->send_mail,"send_smtp_mail ");
    strcpy(ptr->smtp,"127.0.0.1 ");
    strcpy(ptr->to,"[email protected] ");
    strcpy(ptr->from,"[email protected] ");
 

 
  strcat(ptr->send_mail,ptr->smtp);
      strcat(ptr->send_mail,ptr->to);
      strcat(ptr->send_mail,ptr->from);
        strcat(ptr->send_mail,"\n");
  printf("\n%s\n",ptr->send_mail);

  fptr = fopen("/home/bargi/malloc/tmp.txt","w");
  if (fptr == NULL)
  printf("NULL");
  while(ptr->send_mail != "\n")
  {
    fputs(ptr->send_mail,fptr);
    }
    fclose(fptr);
}

---

Can anyone explain why the loop is running infinte..

Thanks

you can't compare strings without a function either. ;)

Code:

---

while(strcmp(ptr->send_mail, "\n") != 0)
{
    fputs(ptr->send_mail,fptr);
}

---

but when you just compare a string with another one character string, you can do away with the function call and check the character directly.

Code:

---

while(ptr->send_mail[0] != '\n')
{
    fputs(ptr->send_mail,fptr);
}

---

Still not working...

Giving segmentation fault

You are strcat'ing many more than 20 characters into "send_mail" string, aren't you?

--
Mats

Increased the size but result is same....??
Should I write single character and iterate whole string??