src/errors.c

   1 /* nbdkit
   2  * Copyright (C) 2013 Red Hat Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met:
   8  *
   9  * * Redistributions of source code must retain the above copyright
  10  * notice, this list of conditions and the following disclaimer.
  11  *
  12  * * Redistributions in binary form must reproduce the above copyright
  13  * notice, this list of conditions and the following disclaimer in the
  14  * documentation and/or other materials provided with the distribution.
  15  *
  16  * * Neither the name of Red Hat nor the names of its contributors may be
  17  * used to endorse or promote products derived from this software without
  18  * specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  23  * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
  24  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  25  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  26  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  27  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  28  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  29  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  30  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include <config.h>
  35
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <stdarg.h>
  39 #include <string.h>
  40 #include <errno.h>
  41
  42 #include "nbdkit-plugin.h"
  43 #include "internal.h"
  44
  45 static void
  46 prologue (const char *type)
  47 {
  48   const char *name = tls_get_name ();
  49   size_t instance_num = tls_get_instance_num ();
  50
  51   fprintf (stderr, "%s: ", program_name);
  52
  53   if (name) {
  54     fprintf (stderr, "%s", name);
  55     if (instance_num > 0)
  56       fprintf (stderr, "[%zu]", instance_num);
  57     fprintf (stderr, ": ");
  58   }
  59
  60   fprintf (stderr, "%s: ", type);
  61 }
  62
  63 /* Note: preserves the previous value of errno. */
  64 void
  65 nbdkit_vdebug (const char *fs, va_list args)
  66 {
  67   int err = errno;
  68
  69   if (!verbose)
  70     return;
  71
  72   prologue ("debug");
  73
  74   vfprintf (stderr, fs, args);
  75
  76   fprintf (stderr, "\n");
  77
  78   errno = err;
  79 }
  80
  81 /* Note: preserves the previous value of errno. */
  82 void
  83 nbdkit_debug (const char *fs, ...)
  84 {
  85   va_list args;
  86   int err = errno;
  87
  88   if (!verbose)
  89     return;
  90
  91   prologue ("debug");
  92
  93   va_start (args, fs);
  94   vfprintf (stderr, fs, args);
  95   va_end (args);
  96
  97   fprintf (stderr, "\n");
  98
  99   errno = err;
 100 }
 101
 102 /* Note: preserves the previous value of errno. */
 103 void
 104 nbdkit_verror (const char *fs, va_list args)
 105 {
 106   int err = errno;
 107
 108   prologue ("error");
 109
 110   vfprintf (stderr, fs, args);
 111
 112   fprintf (stderr, "\n");
 113
 114   errno = err;
 115 }
 116
 117 /* Note: preserves the previous value of errno. */
 118 void
 119 nbdkit_error (const char *fs, ...)
 120 {
 121   va_list args;
 122   int err = errno;
 123
 124   prologue ("error");
 125
 126   va_start (args, fs);
 127   vfprintf (stderr, fs, args);
 128   va_end (args);
 129
 130   fprintf (stderr, "\n");
 131
 132   errno = err;
 133 }