1
2/* note: this routine frees its arguments! */
3char **
4my_join (char **np1, char **np2) {
5    int lth1, lth2;
6    char **p, **q, **np;
7
8    if (np1 == NULL)
9	 return np2;
10    if (np2 == NULL)
11	 return np1;
12    lth1 = lth2 = 0;
13    for (p = np1; *p; p++)
14	 lth1++;
15    for (p = np2; *p; p++)
16	 lth2++;
17    p = np = (char **) my_malloc((lth1+lth2+1)*sizeof(*np));
18    q = np1;
19    while(*q)
20	 *p++ = *q++;
21    q = np2;
22    while(*q)
23	 *p++ = *q++;
24    *p = 0;
25    free(np1);
26    free(np2);
27    return np;
28}
29