Difference between fgets and gets

Question

What is the difference between fgets() and gets()?

I am trying break my loop when the user hits just \"enter\". It\'s working well with

Answer 1

Drop gets() and scanf().
Create a helper function to handle and qualify user input.

// Helper function that strips off _potential_ \n
char *read1line(const char * prompt, char *dest, sizeof size) {
  fputs(prompt, stdout);
  char buf[100];
  *dest = '\0';
  if (fgets(buf, sizeof buf, stdin) == NULL) {
    return NULL;  // EOF or I/O error
  }
  // Remove potential \n
  size_t len = strlen(buf);
  if (len > 0 && buf[len-1] == '\n') {
    buf[--len] = `\0`;
  }
  // Line is empty or too long
  if (len == 0 || len >= size) return NULL;
  return memcpy(dest, buf, len+1);
}

void enter(void)
{
  int i;

  for(i=top; i Enter name (ENTER to quit): ", 
          cat[i].name, sizeof cat[i].name) == NULL) break;
      if (read1line(".> Enter Last Name: ", 
          cat[i].lastname, sizeof cat[i].lastname) == NULL) break;
      if (read1line(".> Enter Phone Number: ", 
          cat[i].phonenum, sizeof cat[i].phonenum) == NULL) break;
      if (read1line(".> Enter e-Mail: ", 
          cat[i].info.mail, sizeof cat[i].info.mail) == NULL) break;
      if (read1line(".> Enter Address: ", 
          cat[i].info.address, sizeof cat[i].info.address) == NULL) break;
    }
  top = i;
}

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Some attributes of fgets() and gets():

fgets() reads input and saves to a buffer until:
1) The buffer is 1 shy of being full - or -
2) '\n' is encountered - or -
3) The stream reaches an end-of-file condition - or -
4) An input error occurs.

gets() does #2 - #4 above except it scans, but does not save a '\n'.
gets() is depreciated in C99 and no longer part of C11.