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Update to a newer version from KTH-Kerberos.
(most work by art@)

/*
 * Copyright (c) 1997, 1998 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden). 
 * All rights reserved. 
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 *
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in the 
 *    documentation and/or other materials provided with the distribution. 
 *
 * 3. All advertising materials mentioning features or use of this software 
 *    must display the following acknowledgement: 
 *      This product includes software developed by Kungliga Tekniska 
 *      Högskolan and its contributors. 
 *
 * 4. Neither the name of the Institute nor the names of its contributors 
 *    may be used to endorse or promote products derived from this software 
 *    without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE. 
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
/* RCSID("$KTH: com_err.c,v 1.13 1999/03/12 15:17:08 bg Exp $"); */
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* #include <roken.h> */
#include "com_err.h"

struct et_list *_et_list;


const char *
error_message (long code)
{
    static char msg[128];
    const char *p = com_right(_et_list, code);
    if (p == NULL)
	p = strerror(code);
    if (p != NULL && *p != '\0') {
	strncpy(msg, p, sizeof(msg) - 1);
	msg[sizeof(msg) - 1] = 0;
    } else 
	sprintf(msg, "Unknown error %ld", code);
    return msg;
}

int
init_error_table(const char **msgs, long base, int count)
{
    initialize_error_table_r(&_et_list, msgs, count, base);
    return 0;
}

static void
default_proc (const char *whoami, long code, const char *fmt, va_list args)
{
    if (whoami)
      fprintf(stderr, "%s: ", whoami);
    if (code)
      fprintf(stderr, "%s ", error_message(code));
    if (fmt)
      vfprintf(stderr, fmt, args);
    fprintf(stderr, "\r\n");	/* ??? */
}

static errf com_err_hook = default_proc;

void 
com_err_va (const char *whoami, 
	    long code, 
	    const char *fmt, 
	    va_list args)
{
    (*com_err_hook) (whoami, code, fmt, args);
}

void
com_err (const char *whoami,
	 long code,
	 const char *fmt, 
	 ...)
{
    va_list ap;
    va_start(ap, fmt);
    com_err_va (whoami, code, fmt, ap);
    va_end(ap);
}

errf
set_com_err_hook (errf new)
{
    errf old = com_err_hook;

    if (new)
	com_err_hook = new;
    else
	com_err_hook = default_proc;
    
    return old;
}

errf
reset_com_err_hook (void) 
{
    return set_com_err_hook(NULL);
}

#define ERRCODE_RANGE   8       /* # of bits to shift table number */
#define BITS_PER_CHAR   6       /* # bits to shift per character in name */

static const char char_set[] =
        "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_";

static char buf[6];

const char *
error_table_name(int num)
{
    int ch;
    int i;
    char *p;

    /* num = aa aaa abb bbb bcc ccc cdd ddd d?? ??? ??? */
    p = buf;
    num >>= ERRCODE_RANGE;
    /* num = ?? ??? ??? aaa aaa bbb bbb ccc ccc ddd ddd */
    num &= 077777777;
    /* num = 00 000 000 aaa aaa bbb bbb ccc ccc ddd ddd */
    for (i = 4; 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(buf);
}