c - Stream buffer size less than input stream, but no immediate segmentation fault -

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Why does the following C code allow an input stream which is greater than the size of the buffer, before it is finally a Partition fault? With a character array of size 1 as the argument of too_bad , will it not allow 1 character of input only?

In addition, what is the effect of not starting c as a int and not char ? The statement will be read from getchar () 4 characters while ((c = getchar ()) = '\ N' & amp; c! = EOF) is? Or will the binary representation of the characters be in 4 bytes?

Note: This is a text from the class, but not the HW. 

  #include & lt; Stdio.h & gt; Zero too_bad (four * buffer) {int c; / * NB: instead of char int because the system gives the integer value 0xffffffff on the I / O function getchar () end file * / char * dest = buffer; / * As long as the new line or file of end (Control-Z for standard input) * / read as ((c = getchar ()) = '\ n' & amp; c; = EOF * dest + + = C; Store next characters in buffer and pointer * / printf ("% s \ n", buffer); } Int main () {four fans [1]; / * Waiting for big trouble * / too_bad (fond); Return 0; }    
 
 
 For the first part of your question, what to do with the page size in it OS And of course, this code causes "undefined behavior".  
 This answer really gives a good idea:  
 
 In addition, what are the effects of starting in C and not a four? When making the statement ((C = getchar ())! = '\ N' & amp; c! = EOF 4 characters will be read from getchar ()? Or will the binary representation of characters be in 4 bytes?   
  is the proto ()  of getchar:  
  int singer (zero);   
 , When you use  c = getchar () , each call will be read from a  getchar ()  stdin, convert  variable  Return the value to assign  int  and  c  to variable.

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