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 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
