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

   1 /* -*-c-*-
   2  *
   3  * $Id: trace.h,v 1.4 1999/10/22 22:39:52 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 1.4  1999/10/22 22:39:52  mdw
  34  * New documented interface for tracing.
  35  *
  36  * Revision 1.3  1999/05/06 19:51:35  mdw
  37  * Reformatted the LGPL notice a little bit.
  38  *
  39  * Revision 1.2  1999/05/05 18:50:31  mdw
  40  * Change licensing conditions to LGPL.
  41  *
  42  * Revision 1.1.1.1  1998/06/17 23:44:42  mdw
  43  * Initial version of mLib
  44  *
  45  */
  46
  47 #ifndef TRACE_H
  48 #define TRACE_H
  49
  50 #ifdef __cplusplus
  51   extern "C" {
  52 #endif
  53
  54 /*----- Header files ------------------------------------------------------*/
  55
  56 #include <stdio.h>
  57
  58 /*----- Data structures ---------------------------------------------------*/
  59
  60 typedef struct trace_opt {
  61   char ch;
  62   unsigned f;
  63   const char *help;
  64 } trace_opt;
  65
  66 /*----- Functions provided ------------------------------------------------*/
  67
  68 /* --- @trace@ --- *
  69  *
  70  * Arguments:   @unsigned l@ = trace level for output
  71  *              @const char *f@ = a @printf@-style format string
  72  *              @...@ = other arguments
  73  *
  74  * Returns:     ---
  75  *
  76  * Use:         Reports a message to the trace output.
  77  */
  78
  79 extern void trace(unsigned /*l*/, const char */*f*/, ...);
  80
  81 /* --- @trace_block@ --- *
  82  *
  83  * Arguments:   @unsigned l@ = trace level for output
  84  *              @const char *s@ = some header string to write
  85  *              @const void *b@ = pointer to a block of memory to dump
  86  *              @size_t sz@ = size of the block of memory
  87  *
  88  * Returns:     ---
  89  *
  90  * Use:         Dumps the contents of a block to the trace output.
  91  */
  92
  93 extern void trace_block(unsigned /*l*/, const char */*s*/,
  94                         const void */*b*/, size_t /*sz*/);
  95
  96 /* --- @trace_on@ --- *
  97  *
  98  * Arguments:   @FILE *fp@ = a file to trace on
  99  *              @unsigned l@ = trace level to set
 100  *
 101  * Returns:     ---
 102  *
 103  * Use:         Enables tracing to a file.
 104  */
 105
 106 extern void trace_on(FILE */*fp*/, unsigned /*l*/);
 107
 108 /* --- @trace_level@ --- *
 109  *
 110  * Arguments:   @unsigned l@ = trace level to set
 111  *
 112  * Returns:     ---
 113  *
 114  * Use:         Sets the tracing level.
 115  */
 116
 117 extern void trace_level(unsigned /*l*/);
 118
 119 /* --- @tracing@ --- *
 120  *
 121  * Arguments:   ---
 122  *
 123  * Returns:     Zero if not tracing, tracing level if tracing.
 124  *
 125  * Use:         Informs the caller whether tracing is enabled.
 126  */
 127
 128 extern unsigned tracing(void);
 129
 130 /* --- @traceopt@ --- *
 131  *
 132  * Arguments:   @trace_opt *t@ = pointer to trace options table
 133  *              @const char *p@ = option string supplied by user
 134  *              @unsigned f@ = initial tracing flags
 135  *              @unsigned bad@ = forbidden tracing flags
 136  *
 137  * Returns:     Trace flags as set by user.
 138  *
 139  * Use:         Parses an option string from the user and sets the
 140  *              appropriate trace flags.  If the argument is null or a single
 141  *              `?' character, a help message is displayed.
 142  */
 143
 144 extern unsigned traceopt(trace_opt */*t*/, const char */*p*/,
 145                          unsigned /*f*/, unsigned /*bad*/);
 146
 147 /*----- Tracing macros ----------------------------------------------------*/
 148
 149 #ifndef NTRACE
 150 #  define T(x) x
 151 #  define IF_TRACING(l, x) if ((l) & tracing()) x
 152 #else
 153 #  define T(x)
 154 #  define IF_TRACING(l, x)
 155 #endif
 156
 157 /*----- That's all, folks -------------------------------------------------*/
 158
 159 #ifdef __cplusplus
 160   }
 161 #endif
 162
 163 #endif