mdb_readstr()

ssize_t mdb_readstr(char *s, size_t nbytes, uintptr_t addr);

The mdb_readstr() function reads a null-terminated C string beginning at the target virtual address addr into the buffer addressed by s. The size of the buffer is specified by nbytes. If the string is longer than can fit in the buffer, the string is truncated to the buffer size and a null byte is stored at s[nbytes - 1]. The length of the string stored in s (not including the terminating null byte) is returned upon success; otherwise -1 is returned to indicate an error.