crypto/heimdal-0.6.3/lib/com_err/com_err.c

   1 /*
   2  * Copyright (c) 1997 - 2002 Kungliga Tekniska Högskolan
   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 }