Strlen

A standard C function that returns the length of a string.

Strncpy

A C standard library function: strncpy is used to copy a maximum of n characters of non-overlapping, fixed-width or null-terminated strings



Source first bytes

Example

"This is the case here because strlen hello is greater than 3 your last strncpy argument"

from question  

Access violation writing to static global variable?

"However if strlen source is greater than n then strncpy will simply copy the first n bytes and will not terminate the string dest with a null byte because there is no space for it"

from question  

Do I need to assign \0 to malloc strings in c?

Others

Example

Your loop is safe because it is based on strlen not the number of substr you computed;strncpy does not null terminate strings

from question  

Why is strncpy in my for loop uneffective?

Instead pass strncpy the size of the buffer or one more than the strlen str

from question  

Why is valgrind reporting an uninitialised value error?

For example strlen returns the number of characters excluding the terminating null so buffers need to be one byte larger than what it returns to hold things;also strncpy does not guarantee null termination while snprintf does

from question  

How to assign string value in C from void *?

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