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
  35 #include <config.h>
  36
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <roken.h>
  41 #include "com_err.h"
  42
  43 struct et_list *_et_list = NULL;
  44
  45
  46 const char *
  47 error_message (long code)
  48 {
  49     static char msg[128];
  50     const char *p = com_right(_et_list, code);
  51     if (p == NULL) {
  52         if (code < 0)
  53             snprintf(msg, sizeof(msg), "Unknown error %ld", code);
  54         else
  55             p = strerror(code);
  56     }
  57     if (p != NULL && *p != '\0') {
  58         strlcpy(msg, p, sizeof(msg));
  59     } else
  60         snprintf(msg, sizeof(msg), "Unknown error %ld", code);
  61     return msg;
  62 }
  63
  64 int
  65 init_error_table(const char **msgs, long base, int count)
  66 {
  67     initialize_error_table_r(&_et_list, msgs, count, base);
  68     return 0;
  69 }
  70
  71 static void
  72 default_proc (const char *whoami, long code, const char *fmt, va_list args)
  73     __attribute__((__format__(__printf__, 3, 0)));
  74
  75 static void
  76 default_proc (const char *whoami, long code, const char *fmt, va_list args)
  77 {
  78     if (whoami)
  79       fprintf(stderr, "%s: ", whoami);
  80     if (code)
  81       fprintf(stderr, "%s ", error_message(code));
  82     if (fmt)
  83       vfprintf(stderr, fmt, args);
  84     fprintf(stderr, "\r\n");    /* ??? */
  85 }
  86
  87 static errf com_err_hook = default_proc;
  88
  89 void
  90 com_err_va (const char *whoami,
  91             long code,
  92             const char *fmt,
  93             va_list args)
  94 {
  95     (*com_err_hook) (whoami, code, fmt, args);
  96 }
  97
  98 void
  99 com_err (const char *whoami,
 100          long code,
 101          const char *fmt,
 102          ...)
 103 {
 104     va_list ap;
 105     va_start(ap, fmt);
 106     com_err_va (whoami, code, fmt, ap);
 107     va_end(ap);
 108 }
 109
 110 errf
 111 set_com_err_hook (errf new)
 112 {
 113     errf old = com_err_hook;
 114
 115     if (new)
 116         com_err_hook = new;
 117     else
 118         com_err_hook = default_proc;
 119
 120     return old;
 121 }
 122
 123 errf
 124 reset_com_err_hook (void)
 125 {
 126     return set_com_err_hook(NULL);
 127 }
 128
 129 #define ERRCODE_RANGE   8       /* # of bits to shift table number */
 130 #define BITS_PER_CHAR   6       /* # bits to shift per character in name */
 131
 132 static const char char_set[] =
 133         "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_";
 134
 135 static char buf[6];
 136
 137 const char *
 138 error_table_name(int num)
 139 {
 140     int ch;
 141     int i;
 142     char *p;
 143
 144     /* num = aa aaa abb bbb bcc ccc cdd ddd d?? ??? ??? */
 145     p = buf;
 146     num >>= ERRCODE_RANGE;
 147     /* num = ?? ??? ??? aaa aaa bbb bbb ccc ccc ddd ddd */
 148     num &= 077777777;
 149     /* num = 00 000 000 aaa aaa bbb bbb ccc ccc ddd ddd */
 150     for (i = 4; i >= 0; i--) {
 151         ch = (num >> BITS_PER_CHAR * i) & ((1 << BITS_PER_CHAR) - 1);
 152         if (ch != 0)
 153             *p++ = char_set[ch-1];
 154     }
 155     *p = '\0';
 156     return(buf);
 157 }
 158
 159 void
 160 add_to_error_table(struct et_list *new_table)
 161 {
 162     struct et_list *et;
 163
 164     for (et = _et_list; et; et = et->next) {
 165         if (et->table->base == new_table->table->base)
 166             return;
 167     }
 168
 169     new_table->next = _et_list;
 170     _et_list = new_table;
 171 }