1 /*
2 * Copyright 1987 by MIT Student Information Processing Board
3 *
4 * Permission to use, copy, modify, and distribute this software and
5 * its documentation for any purpose is hereby granted, provided that
6 * the names of M.I.T. and the M.I.T. S.I.P.B. not be used in
7 * advertising or publicity pertaining to distribution of the software
8 * without specific, written prior permission. M.I.T. and the
9 * M.I.T. S.I.P.B. make no representations about the suitability of
10 * this software for any purpose. It is provided "as is" without
11 * express or implied warranty.
12 */
13
14 #include "com_err.h"
15 #include "error_table.h"
16 #include "internal.h"
17
18 static const char char_set[] =
19 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_";
20
21 static char buf[6];
22
error_table_name(errcode_t num)23 const char * error_table_name(errcode_t num)
24 {
25 int ch;
26 int i;
27 char *p;
28
29 /* num = aa aaa abb bbb bcc ccc cdd ddd d?? ??? ??? */
30 p = buf;
31 num >>= ERRCODE_RANGE;
32 /* num = ?? ??? ??? aaa aaa bbb bbb ccc ccc ddd ddd */
33 num &= 077777777L;
34 /* num = 00 000 000 aaa aaa bbb bbb ccc ccc ddd ddd */
35 for (i = 4; i >= 0; i--) {
36 ch = (int)((num >> BITS_PER_CHAR * i) & ((1 << BITS_PER_CHAR) - 1));
37 if (ch != 0)
38 *p++ = char_set[ch-1];
39 }
40 *p = '\0';
41 return(buf);
42 }
43