🚀 go-pugleaf

berndl@sidonius.fmi.uni-passau.de (Klaus Berndl) writes:


>Please look at the snipped of code:
>main () {

>  char* buf = NULL;

>  buf = (char*)malloc(100);
>  strcpy(buf, "Klaus Berndl");
>  printf("\n%s\n", buf);

>/* line 10 */  buf = (char*)realloc(buf, strlen(buf)+1);  /* line 10 */

>My questions are now: How much memory is allocated for 'buf' after
>executing line 10?! 

Whatever the second argument to realloc() evaluated to. I couldn't be bothered
counting the letters...

>Does realloc 'freeing' the storage behind byte 13?

Yep.

>Or are still 100 bytes allocated for buf?

No. Just try writing a little program that malloc()s something huge, then
realloc() it down to something tiny, then writes to the end of the original
(huge) buffer. You should get a segfault.