DB_STR
idx = next[DB_STR];
next[DB_STR] += strlen(dstr) + 1;
return (map_seg(hdp, idx, PROT_READ, DB_STR));
return (map_seg(hdp, idx, PROT_READ | PROT_WRITE, DB_STR));
count[DB_STR] += strlen(str) + 1;
cp = get_string(hdp, DB_NUM(hdp, DB_STR) - 1);
#define VALID_STR(h, i, s) ((i) + strlen(s) + 1 <= DB_HDR(h)->nelems[DB_STR])