1/*
2 * Copyright (c) 1997 - 2002 Kungliga Tekniska H�gskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33/* $FreeBSD$ */
34
35#ifdef HAVE_CONFIG_H
36#include <config.h>
37RCSID("$Id: com_err.c 14930 2005-04-24 19:43:06Z lha $");
38#endif
39#include <stdio.h>
40#include <stdlib.h>
41#include <string.h>
42#include "com_err.h"
43
44struct et_list *_et_list = NULL;
45
46
47const char *
48error_message (long code)
49{
50    static char msg[128];
51    const char *p = com_right(_et_list, code);
52    if (p == NULL) {
53	if (code < 0)
54	    snprintf(msg, sizeof(msg), "Unknown error %ld", code);
55	else
56	    p = strerror(code);
57    }
58    if (p != NULL && *p != '\0') {
59	strlcpy(msg, p, sizeof(msg));
60    } else
61	snprintf(msg, sizeof(msg), "Unknown error %ld", code);
62    return msg;
63}
64
65int
66init_error_table(const char **msgs, long base, int count)
67{
68    initialize_error_table_r(&_et_list, msgs, count, base);
69    return 0;
70}
71
72static void
73default_proc (const char *whoami, long code, const char *fmt, va_list args)
74    __attribute__((__format__(__printf__, 3, 0)));
75
76static void
77default_proc (const char *whoami, long code, const char *fmt, va_list args)
78{
79    if (whoami)
80      fprintf(stderr, "%s: ", whoami);
81    if (code)
82      fprintf(stderr, "%s ", error_message(code));
83    if (fmt)
84      vfprintf(stderr, fmt, args);
85    fprintf(stderr, "\r\n");	/* ??? */
86}
87
88static errf com_err_hook = default_proc;
89
90void
91com_err_va (const char *whoami,
92	    long code,
93	    const char *fmt,
94	    va_list args)
95{
96    (*com_err_hook) (whoami, code, fmt, args);
97}
98
99void
100com_err (const char *whoami,
101	 long code,
102	 const char *fmt,
103	 ...)
104{
105    va_list ap;
106    va_start(ap, fmt);
107    com_err_va (whoami, code, fmt, ap);
108    va_end(ap);
109}
110
111errf
112set_com_err_hook (errf new)
113{
114    errf old = com_err_hook;
115
116    if (new)
117	com_err_hook = new;
118    else
119	com_err_hook = default_proc;
120
121    return old;
122}
123
124errf
125reset_com_err_hook (void)
126{
127    return set_com_err_hook(NULL);
128}
129
130#define ERRCODE_RANGE   8       /* # of bits to shift table number */
131#define BITS_PER_CHAR   6       /* # bits to shift per character in name */
132
133static const char char_set[] =
134        "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_";
135
136static char buf[6];
137
138const char *
139error_table_name(int num)
140{
141    int ch;
142    int i;
143    char *p;
144
145    /* num = aa aaa abb bbb bcc ccc cdd ddd d?? ??? ??? */
146    p = buf;
147    num >>= ERRCODE_RANGE;
148    /* num = ?? ??? ??? aaa aaa bbb bbb ccc ccc ddd ddd */
149    num &= 077777777;
150    /* num = 00 000 000 aaa aaa bbb bbb ccc ccc ddd ddd */
151    for (i = 4; i >= 0; i--) {
152        ch = (num >> BITS_PER_CHAR * i) & ((1 << BITS_PER_CHAR) - 1);
153        if (ch != 0)
154            *p++ = char_set[ch-1];
155    }
156    *p = '\0';
157    return(buf);
158}
159
160void
161add_to_error_table(struct et_list *new_table)
162{
163    struct et_list *et;
164
165    for (et = _et_list; et; et = et->next) {
166	if (et->table->base == new_table->table->base)
167	    return;
168    }
169
170    new_table->next = _et_list;
171    _et_list = new_table;
172}
173