com_err.c revision 78527 
1/*
2 * Copyright (c) 1997 - 2001 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
34#ifdef HAVE_CONFIG_H
35#include <config.h>
36RCSID("$Id: com_err.c,v 1.17 2001/05/11 20:02:34 assar Exp $");
37#endif
38#include <stdio.h>
39#include <stdlib.h>
40#include <string.h>
41#include <roken.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	p = strerror(code);
54    if (p != NULL && *p != '\0') {
55	strncpy(msg, p, sizeof(msg) - 1);
56	msg[sizeof(msg) - 1] = 0;
57    } else
58	sprintf(msg, "Unknown error %ld", code);
59    return msg;
60}
61
62int
63init_error_table(const char **msgs, long base, int count)
64{
65    initialize_error_table_r(&_et_list, msgs, count, base);
66    return 0;
67}
68
69static void
70default_proc (const char *whoami, long code, const char *fmt, va_list args)
71    __attribute__((__format__(__printf__, 3, 0)));
72
73static void
74default_proc (const char *whoami, long code, const char *fmt, va_list args)
75{
76    if (whoami)
77      fprintf(stderr, "%s: ", whoami);
78    if (code)
79      fprintf(stderr, "%s ", error_message(code));
80    if (fmt)
81      vfprintf(stderr, fmt, args);
82    fprintf(stderr, "\r\n");	/* ??? */
83}
84
85static errf com_err_hook = default_proc;
86
87void
88com_err_va (const char *whoami,
89	    long code,
90	    const char *fmt,
91	    va_list args)
92{
93    (*com_err_hook) (whoami, code, fmt, args);
94}
95
96void
97com_err (const char *whoami,
98	 long code,
99	 const char *fmt,
100	 ...)
101{
102    va_list ap;
103    va_start(ap, fmt);
104    com_err_va (whoami, code, fmt, ap);
105    va_end(ap);
106}
107
108errf
109set_com_err_hook (errf new)
110{
111    errf old = com_err_hook;
112
113    if (new)
114	com_err_hook = new;
115    else
116	com_err_hook = default_proc;
117
118    return old;
119}
120
121errf
122reset_com_err_hook (void)
123{
124    return set_com_err_hook(NULL);
125}
126
127#define ERRCODE_RANGE   8       /* # of bits to shift table number */
128#define BITS_PER_CHAR   6       /* # bits to shift per character in name */
129
130static const char char_set[] =
131        "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_";
132
133static char buf[6];
134
135const char *
136error_table_name(int num)
137{
138    int ch;
139    int i;
140    char *p;
141
142    /* num = aa aaa abb bbb bcc ccc cdd ddd d?? ??? ??? */
143    p = buf;
144    num >>= ERRCODE_RANGE;
145    /* num = ?? ??? ??? aaa aaa bbb bbb ccc ccc ddd ddd */
146    num &= 077777777;
147    /* num = 00 000 000 aaa aaa bbb bbb ccc ccc ddd ddd */
148    for (i = 4; i >= 0; i--) {
149        ch = (num >> BITS_PER_CHAR * i) & ((1 << BITS_PER_CHAR) - 1);
150        if (ch != 0)
151            *p++ = char_set[ch-1];
152    }
153    *p = '\0';
154    return(buf);
155}
156
157void
158add_to_error_table(struct et_list *new_table)
159{
160    struct et_list *et;
161
162    for (et = _et_list; et; et = et->next) {
163	if (et->table->base == new_table->table->base)
164	    return;
165    }
166
167    new_table->next = _et_list;
168    _et_list = new_table;
169}
170