3 * $Id: trace.h,v 1.4 1999/10/22 22:39:52 mdw Exp $
5 * Tracing functions for debugging
7 * (c) 1998 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of the mLib utilities library.
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.
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.
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,
30 /*----- Revision history --------------------------------------------------*
33 * Revision 1.4 1999/10/22 22:39:52 mdw
34 * New documented interface for tracing.
36 * Revision 1.3 1999/05/06 19:51:35 mdw
37 * Reformatted the LGPL notice a little bit.
39 * Revision 1.2 1999/05/05 18:50:31 mdw
40 * Change licensing conditions to LGPL.
42 * Revision 1.1.1.1 1998/06/17 23:44:42 mdw
43 * Initial version of mLib
54 /*----- Header files ------------------------------------------------------*/
58 /*----- Data structures ---------------------------------------------------*/
60 typedef struct trace_opt {
66 /*----- Functions provided ------------------------------------------------*/
70 * Arguments: @unsigned l@ = trace level for output
71 * @const char *f@ = a @printf@-style format string
72 * @...@ = other arguments
76 * Use: Reports a message to the trace output.
79 extern void trace(unsigned /*l*/, const char */*f*/, ...);
81 /* --- @trace_block@ --- *
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
90 * Use: Dumps the contents of a block to the trace output.
93 extern void trace_block(unsigned /*l*/, const char */*s*/,
94 const void */*b*/, size_t /*sz*/);
96 /* --- @trace_on@ --- *
98 * Arguments: @FILE *fp@ = a file to trace on
99 * @unsigned l@ = trace level to set
103 * Use: Enables tracing to a file.
106 extern void trace_on(FILE */*fp*/, unsigned /*l*/);
108 /* --- @trace_level@ --- *
110 * Arguments: @unsigned l@ = trace level to set
114 * Use: Sets the tracing level.
117 extern void trace_level(unsigned /*l*/);
119 /* --- @tracing@ --- *
123 * Returns: Zero if not tracing, tracing level if tracing.
125 * Use: Informs the caller whether tracing is enabled.
128 extern unsigned tracing(void);
130 /* --- @traceopt@ --- *
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
137 * Returns: Trace flags as set by user.
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.
144 extern unsigned traceopt(trace_opt */*t*/, const char */*p*/,
145 unsigned /*f*/, unsigned /*bad*/);
147 /*----- Tracing macros ----------------------------------------------------*/
151 # define IF_TRACING(l, x) if ((l) & tracing()) x
154 # define IF_TRACING(l, x)
157 /*----- That's all, folks -------------------------------------------------*/