contrib/com_err/com_err.c

   1 /*
   2  * Copyright (c) 1997, 1998 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. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by Kungliga Tekniska
  20  *      Högskolan and its contributors.
  21  *
  22  * 4. Neither the name of the Institute nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 #ifdef HAVE_CONFIG_H
  40 #include <config.h>
  41 RCSID("$Id: com_err.c,v 1.13 1999/03/12 15:17:08 bg Exp $");
  42 #endif
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include "com_err.h"
  47
  48 struct et_list *_et_list;
  49
  50
  51 const char *
  52 error_message (long code)
  53 {
  54     static char msg[128];
  55     const char *p = com_right(_et_list, code);
  56     if (p == NULL)
  57         p = strerror(code);
  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 {
  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
  85 static errf com_err_hook = default_proc;
  86
  87 void
  88 com_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
  96 void
  97 com_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
 108 errf
 109 set_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
 121 errf
 122 reset_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
 130 static const char char_set[] =
 131         "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_";
 132
 133 static char buf[6];
 134
 135 const char *
 136 error_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 }