Keeping strcpy and memcpy straight when copying memory.

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Күн бұрын

Пікірлер: 21

@paulk314 2 жыл бұрын

strncpy isn't just like strncpy except for copying only up to n bytes. It actually always writes exactly n bytes: "If the length of src is less than n, strncpy() writes additional null bytes to dest to ensure that a total of n bytes are written."

@DhimantThanki 2 жыл бұрын

This is the first channel where I found the actual usage of memcpy()

@SaintSaint 3 жыл бұрын

Superb content.

@AmolGautam 4 жыл бұрын

Thank you.

@prashanthkumar0 3 жыл бұрын

I am watching all your videos from begining till end because i really lile the content... I have a question though.. how can system() be exploited if im just using const char in it ?!

@rustycherkas8229 2 жыл бұрын

strncpy() is a misleading name, so often associated with strcpy. and strcat(). If strlen( src ) >= len, this function is equivalent to memcpy() and does not guarantee a null terminated string in the destination. Just something to be aware of...

@maxaafbackname5562 Жыл бұрын

If the length of the string is known, is memcpy() faster than strcpy()? Or do the perfom equal in most implementations? No one implements strcpy() with calls to strlen() + memcpy() I hope...

@aritrasurroy4794 6 жыл бұрын

But then we could use memcpy instead of strncpy to copy upto a certain no of bytes?

@JacobSorber 6 жыл бұрын

Memcpy will always copy a fixed number of bytes. Strncpy will copy up to a fixed number of bytes, but it will stop if it finds a null character (marking the end of the string).

@aritrasurroy4794 6 жыл бұрын

Okay, I get the difference. Thank you, Mr. Jacob.

@steinmil 5 жыл бұрын

thanks

@KFlorent13 3 жыл бұрын

Is 0 the null character ? I thought it was \0 ?

@JacobSorber 3 жыл бұрын

They're both the same thing. \0 is the escape sequence for the NULL character (or the character with value of 0). Just different ways to say the same thing.

@KFlorent13 3 жыл бұрын

@@JacobSorber Thanks !