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 "config.h"
15 #include "com_err.h"
16 #include "error_table.h"
17 #include "internal.h"
18
19 static const char char_set[] =
20 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_";
21
22 static char buf[6];
23
error_table_name(errcode_t num)24 const char * error_table_name(errcode_t num)
25 {
26 int ch;
27 int i;
28 char *p;
29
30 /* num = aa aaa abb bbb bcc ccc cdd ddd d?? ??? ??? */
31 p = buf;
32 num >>= ERRCODE_RANGE;
33 /* num = ?? ??? ??? aaa aaa bbb bbb ccc ccc ddd ddd */
34 num &= 077777777L;
35 /* num = 00 000 000 aaa aaa bbb bbb ccc ccc ddd ddd */
36 for (i = 4; i >= 0; i--) {
37 ch = (int)((num >> BITS_PER_CHAR * i) & ((1 << BITS_PER_CHAR) - 1));
38 if (ch != 0)
39 *p++ = char_set[ch-1];
40 }
41 *p = '\0';
42 return(buf);
43 }
44