et_name.c

/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
 * Copyright 1997 by Massachusetts Institute of Technology
 *
 * Copyright 1987 by MIT Student Information Processing Board
 *
 * Permission to use, copy, modify, and distribute this software
 * and its documentation for any purpose and without fee is
 * hereby granted, provided that the above copyright notice
 * appear in all copies and that both that copyright notice and
 * this permission notice appear in supporting documentation,
 * and that the names of M.I.T. and the M.I.T. S.I.P.B. not be
 * used in advertising or publicity pertaining to distribution
 * of the software without specific, written prior permission.
 * Furthermore if you modify this software you must label
 * your software as modified software and not distribute it in such a
 * fashion that it might be confused with the original M.I.T. software.
 * M.I.T. and the M.I.T. S.I.P.B. make no representations about
 * the suitability of this software for any purpose.  It is
 * provided "as is" without express or implied warranty.
 */

#include "com_err.h"
#include "error_table.h"

static const char char_set[] =
    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_";

const char *
error_table_name_r (unsigned long num,
                    /*@out@*/ /*@returned@*/ char *outbuf)
/*@modifies outbuf@*/
{
    long ch;
    int i;
    /*@out@*/ char *p;

    p = outbuf;
    num >>= ERRCODE_RANGE;

    for (i = 3; i >= 0; i--) {
        ch = (num >> BITS_PER_CHAR * i) & ((1 << BITS_PER_CHAR) - 1);
        if (ch != 0)
            *p++ = char_set[ch-1];
    }
    *p = '\0';
    return(outbuf);
}

/*@observer@*/
const char * error_table_name(unsigned long num)
/*@modifies internalState@*/
{
    static char buf[6];

    return error_table_name_r(num, buf);
}