mdw@git.distorted.org.uk Git - mLib/blob - trace.h

   1 /* -*-c-*-
   2  *
   3  * $Id: trace.h,v 1.3 1999/05/06 19:51:35 mdw Exp $
   4  *
   5  * Tracing functions for debugging
   6  *
   7  * (c) 1998 Straylight/Edgeware
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of the mLib utilities library.
  13  *
  14  * mLib is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU Library General Public License as
  16  * published by the Free Software Foundation; either version 2 of the
  17  * License, or (at your option) any later version.
  18  *
  19  * mLib is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU Library General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU Library General Public
  25  * License along with mLib; if not, write to the Free
  26  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  27  * MA 02111-1307, USA.
  28  */
  29
  30 /*----- Revision history --------------------------------------------------*
  31  *
  32  * $Log: trace.h,v $
  33  * Revision 1.3  1999/05/06 19:51:35  mdw
  34  * Reformatted the LGPL notice a little bit.
  35  *
  36  * Revision 1.2  1999/05/05 18:50:31  mdw
  37  * Change licensing conditions to LGPL.
  38  *
  39  * Revision 1.1.1.1  1998/06/17 23:44:42  mdw
  40  * Initial version of mLib
  41  *
  42  */
  43
  44 #ifndef TRACE_H
  45 #define TRACE_H
  46
  47 #ifdef __cplusplus
  48   extern "C" {
  49 #endif
  50
  51 #include <stdio.h>
  52
  53 /*----- Functions provided ------------------------------------------------*/
  54
  55 /* --- @trace@ --- *
  56  *
  57  * Arguments:   @unsigned int l@ = trace level for output
  58  *              @const char *f@ = a @printf@-style format string
  59  *              @...@ = other arguments
  60  *
  61  * Returns:     ---
  62  *
  63  * Use:         Reports a message to the trace output.
  64  */
  65
  66 extern void trace(unsigned int /*l*/, const char */*f*/, ...);
  67
  68 /* --- @trace_block@ --- *
  69  *
  70  * Arguments:   @unsigned int l@ = trace level for output
  71  *              @const char *s@ = some header string to write
  72  *              @const void *b@ = pointer to a block of memory to dump
  73  *              @size_t sz@ = size of the block of memory
  74  *
  75  * Returns:     ---
  76  *
  77  * Use:         Dumps the contents of a block to the trace output.
  78  */
  79
  80 extern void trace_block(unsigned int /*l*/, const char */*s*/,
  81                         const void */*b*/, size_t /*sz*/);
  82
  83 /* --- @trace_on@ --- *
  84  *
  85  * Arguments:   @FILE *fp@ = a file to trace on
  86  *              @unsigned int l@ = trace level to set
  87  *
  88  * Returns:     ---
  89  *
  90  * Use:         Enables tracing to a file.
  91  */
  92
  93 extern void trace_on(FILE */*fp*/, unsigned int /*l*/);
  94
  95 /* --- @trace_setLevel@ --- *
  96  *
  97  * Arguments:   @unsigned int l@ = trace level to set
  98  *
  99  * Returns:     ---
 100  *
 101  * Use:         Sets the tracing level.
 102  */
 103
 104 extern void trace_setLevel(unsigned int /*l*/);
 105
 106 /* --- @tracing@ --- *
 107  *
 108  * Arguments:   ---
 109  *
 110  * Returns:     Zero if not tracing, tracing level if tracing.
 111  *
 112  * Use:         Informs the caller whether tracing is enabled.
 113  */
 114
 115 extern unsigned int tracing(void);
 116
 117 /*----- Tracing macros ----------------------------------------------------*/
 118
 119 #ifndef NTRACE
 120 #  define T(x) x
 121 #  define IF_TRACING(l, x) if ((l) & tracing()) x
 122 #else
 123 #  define T(x)
 124 #  define IF_TRACING(l, x)
 125 #endif
 126
 127 /*----- That's all, folks -------------------------------------------------*/
 128
 129 #ifdef __cplusplus
 130   }
 131 #endif
 132
 133 #endif