fetchname
filearg[0] = fetchname(buf, &exists, 0);
filearg[0] = fetchname(bestguess, &exists, 0);
names[OLD_FILE].path = fetchname(s + 4,
names[NEW_FILE].path = fetchname(s + off,
names[OLD_FILE].path = fetchname(s + off,
names[INDEX_FILE].path = fetchname(s + 6,
char *fetchname(const char *, bool *, int);