xref: /freebsd/crypto/heimdal/lib/com_err/com_err.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
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 
34 #ifdef HAVE_CONFIG_H
35 #include <config.h>
36 RCSID("$Id: com_err.c,v 1.18 2002/03/10 23:07:01 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 
44 struct et_list *_et_list = NULL;
45 
46 
47 const char *
48 error_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 	    sprintf(msg, "Unknown error %ld", code);
55 	else
56 	    p = strerror(code);
57     }
58     if (p != NULL && *p != '\0') {
59 	strncpy(msg, p, sizeof(msg) - 1);
60 	msg[sizeof(msg) - 1] = 0;
61     } else
62 	sprintf(msg, "Unknown error %ld", code);
63     return msg;
64 }
65 
66 int
67 init_error_table(const char **msgs, long base, int count)
68 {
69     initialize_error_table_r(&_et_list, msgs, count, base);
70     return 0;
71 }
72 
73 static void
74 default_proc (const char *whoami, long code, const char *fmt, va_list args)
75     __attribute__((__format__(__printf__, 3, 0)));
76 
77 static void
78 default_proc (const char *whoami, long code, const char *fmt, va_list args)
79 {
80     if (whoami)
81       fprintf(stderr, "%s: ", whoami);
82     if (code)
83       fprintf(stderr, "%s ", error_message(code));
84     if (fmt)
85       vfprintf(stderr, fmt, args);
86     fprintf(stderr, "\r\n");	/* ??? */
87 }
88 
89 static errf com_err_hook = default_proc;
90 
91 void
92 com_err_va (const char *whoami,
93 	    long code,
94 	    const char *fmt,
95 	    va_list args)
96 {
97     (*com_err_hook) (whoami, code, fmt, args);
98 }
99 
100 void
101 com_err (const char *whoami,
102 	 long code,
103 	 const char *fmt,
104 	 ...)
105 {
106     va_list ap;
107     va_start(ap, fmt);
108     com_err_va (whoami, code, fmt, ap);
109     va_end(ap);
110 }
111 
112 errf
113 set_com_err_hook (errf new)
114 {
115     errf old = com_err_hook;
116 
117     if (new)
118 	com_err_hook = new;
119     else
120 	com_err_hook = default_proc;
121 
122     return old;
123 }
124 
125 errf
126 reset_com_err_hook (void)
127 {
128     return set_com_err_hook(NULL);
129 }
130 
131 #define ERRCODE_RANGE   8       /* # of bits to shift table number */
132 #define BITS_PER_CHAR   6       /* # bits to shift per character in name */
133 
134 static const char char_set[] =
135         "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_";
136 
137 static char buf[6];
138 
139 const char *
140 error_table_name(int num)
141 {
142     int ch;
143     int i;
144     char *p;
145 
146     /* num = aa aaa abb bbb bcc ccc cdd ddd d?? ??? ??? */
147     p = buf;
148     num >>= ERRCODE_RANGE;
149     /* num = ?? ??? ??? aaa aaa bbb bbb ccc ccc ddd ddd */
150     num &= 077777777;
151     /* num = 00 000 000 aaa aaa bbb bbb ccc ccc ddd ddd */
152     for (i = 4; i >= 0; i--) {
153         ch = (num >> BITS_PER_CHAR * i) & ((1 << BITS_PER_CHAR) - 1);
154         if (ch != 0)
155             *p++ = char_set[ch-1];
156     }
157     *p = '\0';
158     return(buf);
159 }
160 
161 void
162 add_to_error_table(struct et_list *new_table)
163 {
164     struct et_list *et;
165 
166     for (et = _et_list; et; et = et->next) {
167 	if (et->table->base == new_table->table->base)
168 	    return;
169     }
170 
171     new_table->next = _et_list;
172     _et_list = new_table;
173 }
174