ref: 166afefab99ee1b83efd2b02cefae52f6584fd0c
dir: /sys/src/cmd/unix/u9fs/safecpy.c/
#include <string.h> void safecpy(char *to, char *from, int tolen) { int fromlen; memset(to, 0, tolen); fromlen = from ? strlen(from) : 0; if (fromlen > tolen) fromlen = tolen; memcpy(to, from, fromlen); }