this post was submitted on 26 Aug 2024
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By looking at the difference between
strcpy
andstrncpy
. Preferably, though, you should simply learn C before writing C.The gist of is is that
strcpy
takes a null-terminated string and copies it somewhere, whilestrncpy
takes a zero-terminated string and copies it somewhere but will not write more thann
bytes.strncpy
literally has exactly one more parameter thanstrcpy
, that beingn
, hence the name. Ifn
is smaller than the string length (as in: distance to first null byte) then you're bound to have garbage in your destination, and to check for that you have to dereference the pointerstrncpy
returns and check if it's actually null. Yay C error handling.In retrospect null-terminated strings were a mistake, but so were many other things, at some point you just have to accept that there's hysterical raisins everywhere.
Wha? N is just maximum length of string to copy. Data after dst+n is unchanged.
All hail length-prefixed strings!
Sure but that means the part before that is garbage because you have a null terminated string without terminator.
Or at least that's how I see it. If your intention isn't to start and end with a null-terminated string you should be using memcpy. Let us not talk about situations where
CHAR_BIT != 8
that's not POSIX anyway.Even better, just avoid doing string manipulation in C.
Yeah, let's not talk about 20-bit one's complement ints.