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

   1 /* -*-c-*-
   2  *
   3  * $Id: trace.c,v 1.2 1999/05/05 18:50:31 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 Software
  26  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27  */
  28
  29 /*----- Revision history --------------------------------------------------*
  30  *
  31  * $Log: trace.c,v $
  32  * Revision 1.2  1999/05/05 18:50:31  mdw
  33  * Change licensing conditions to LGPL.
  34  *
  35  * Revision 1.1.1.1  1998/06/17 23:44:42  mdw
  36  * Initial version of mLib
  37  *
  38  */
  39
  40 /*----- Header files ------------------------------------------------------*/
  41
  42 /* --- ANSI headers --- */
  43
  44 #include <ctype.h>
  45 #include <stdarg.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49
  50 /* --- Local headers --- */
  51
  52 #include "quis.h"
  53 #include "trace.h"
  54
  55 /*----- Private state information -----------------------------------------*/
  56
  57 static FILE *trace__fp = 0;             /* Where does debugging go? */
  58 static unsigned int trace__lvl = 0;     /* How much tracing gets done? */
  59
  60 /*----- Functions provided ------------------------------------------------*/
  61
  62 /* --- @trace@ --- *
  63  *
  64  * Arguments:   @unsigned int l@ = trace level for output
  65  *              @const char *f@ = a @printf@-style format string
  66  *              @...@ = other arguments
  67  *
  68  * Returns:     ---
  69  *
  70  * Use:         Reports a message to the trace output.
  71  */
  72
  73 void trace(unsigned int l, const char *f, ...)
  74 {
  75   va_list ap;
  76   if ((l & tracing()) == 0)
  77     return;
  78   va_start(ap, f);
  79   fprintf(trace__fp, "*** %s: ", QUIS);
  80   vfprintf(trace__fp, f, ap);
  81   va_end(ap);
  82   putc('\n', trace__fp);
  83   fflush(trace__fp);
  84 }
  85
  86 /* --- @trace_block@ --- *
  87  *
  88  * Arguments:   @unsigned int l@ = trace level for output
  89  *              @const char *s@ = some header string to write
  90  *              @const void *b@ = pointer to a block of memory to dump
  91  *              @size_t sz@ = size of the block of memory
  92  *
  93  * Returns:     ---
  94  *
  95  * Use:         Dumps the contents of a block to the trace output.
  96  */
  97
  98 void trace_block(unsigned int l, const char *s, const void *b, size_t sz)
  99 {
 100   const unsigned char *p = b;
 101   size_t i;
 102   unsigned long o = 0;
 103   size_t c;
 104
 105   /* --- Skip if the trace level is too high --- */
 106
 107   if ((l & tracing()) == 0)
 108     return;
 109
 110   /* --- Now start work --- */
 111
 112   fprintf(trace__fp, "*** %s: %s\n", QUIS, s);
 113
 114   while (sz) {
 115     fprintf(trace__fp, "*** %s:   %08lx : ", QUIS, o);
 116     for (i = 0; i < 8; i++) {
 117       if (i < sz)
 118         fprintf(trace__fp, "%02x ", p[i]);
 119       else
 120         fputs("** ", trace__fp);
 121     }
 122     fputs(": ", trace__fp);
 123     for (i = 0; i < 8; i++) {
 124       if (i < sz)
 125         fputc(isprint(p[i]) ? p[i] : '.', trace__fp);
 126       else
 127         fputc('*', trace__fp);
 128     }
 129     fputc('\n', trace__fp);
 130     c = (sz >= 8) ? 8 : sz;
 131     sz -= c, p += c, o += c;
 132   }
 133   fflush(trace__fp);
 134 }
 135
 136 /* --- @trace_on@ --- *
 137  *
 138  * Arguments:   @FILE *fp@ = a file to trace on
 139  *              @unsigned int l@ = trace level to set
 140  *
 141  * Returns:     ---
 142  *
 143  * Use:         Enables tracing to a file.
 144  */
 145
 146 void trace_on(FILE *fp, unsigned int l)
 147 {
 148   trace__fp = fp;
 149   if (!trace__lvl)
 150     trace__lvl = l;
 151 }
 152
 153 /* --- @trace_setLevel@ --- *
 154  *
 155  * Arguments:   @unsigned int l@ = trace level to set
 156  *
 157  * Returns:     ---
 158  *
 159  * Use:         Sets the tracing level.
 160  */
 161
 162 void trace_setLevel(unsigned int l)
 163 {
 164   trace__lvl = l;
 165 }
 166
 167 /* --- @tracing@ --- *
 168  *
 169  * Arguments:   ---
 170  *
 171  * Returns:     Zero if not tracing, tracing level if tracing.
 172  *
 173  * Use:         Informs the caller whether tracing is enabled.
 174  */
 175
 176 unsigned int tracing(void)
 177 {
 178   return (trace__fp ? trace__lvl : 0u);
 179 }
 180
 181 /*----- That's all, folks -------------------------------------------------*/