Write implement string copy function strcpy () full version

A topic programmed to implement a string copy function strcpy (), many people often write the following code quickly.

void strcpy (char *strdest,char *strsrc) {    while ((*strdest++ = * strsrc++)! = ');//assignment of data in a string array, knowing the end of the string}

　Actually take a closer look at this implementation process is not perfect, strictly speaking very not rigorous, we can improve.

char * strcpy (char *strdest, const char *STRSRC)//Adds the source string const, indicating that read-only is the input parameter {    assert (strdest! = NULL) && (STRSR c! = NULL));//to the source address and destination address plus a non-0 assertion, judging validity    char *address = strdest;    while ((*strdest++ = *strsrc++)! = 0 ');//Copy the return address one by one    ;}

　　This procedure looks more perfect, the interviewer will be very satisfied.

Write implement string copy function strcpy () full version