On Monday, May 23, 2011 18:38:49 Alexander Holler wrote:
Am 24.05.2011 00:22, schrieb Wolfgang Denk:
Alexander Holler wrote:
So you I will look forward to checks for NULL pointers and similiar in all C standard functions implemented in u-boot to circumvent tons of possible real world bugs in all callers of strcpy, strlen, mem* and whatever.
If you think a bit about this, you may find it more difficult than you expect. Keep in mind that on most systems supported by U-Boot code like
int *p = (int *)0;
print("*p = %d\n", *p);
is perfectly legal and supposed to work without any problems - because 0 is a legal address, and it makes perfect senze that commands like "md" or "cp" can be used to access it. In the result, strcpy(), strlen(), mem*() and whatever must beable to work on address 0 likeon any other address, too.
I've never seen a valid use of strcpy() with a null-pointer in real world programs, which we are talking about, except in bugs.
i'm lazy and type "0" all the time for loading files, copying memory, displaying things, etc... in u-boot. i dont feel like retraining my finger muscle memory if i dont have to ;). -mike