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

   1 /* -*-c-*-
   2  *
   3  * $Id: trace.c,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.c,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 /*----- Header files ------------------------------------------------------*/
  45
  46 /* --- ANSI headers --- */
  47
  48 #include <ctype.h>
  49 #include <stdarg.h>
  50 #include <stdio.h>
  51 #include <stdlib.h>
  52 #include <string.h>
  53
  54 /* --- Local headers --- */
  55
  56 #include "quis.h"
  57 #include "trace.h"
  58
  59 /*----- Private state information -----------------------------------------*/
  60
  61 static FILE *trace__fp = 0;             /* Where does debugging go? */
  62 static unsigned int trace__lvl = 0;     /* How much tracing gets done? */
  63
  64 /*----- Functions provided ------------------------------------------------*/
  65
  66 /* --- @trace@ --- *
  67  *
  68  * Arguments:   @unsigned int l@ = trace level for output
  69  *              @const char *f@ = a @printf@-style format string
  70  *              @...@ = other arguments
  71  *
  72  * Returns:     ---
  73  *
  74  * Use:         Reports a message to the trace output.
  75  */
  76
  77 void trace(unsigned int l, const char *f, ...)
  78 {
  79   va_list ap;
  80   if ((l & tracing()) == 0)
  81     return;
  82   va_start(ap, f);
  83   fprintf(trace__fp, "*** %s: ", QUIS);
  84   vfprintf(trace__fp, f, ap);
  85   va_end(ap);
  86   putc('\n', trace__fp);
  87   fflush(trace__fp);
  88 }
  89
  90 /* --- @trace_block@ --- *
  91  *
  92  * Arguments:   @unsigned int l@ = trace level for output
  93  *              @const char *s@ = some header string to write
  94  *              @const void *b@ = pointer to a block of memory to dump
  95  *              @size_t sz@ = size of the block of memory
  96  *
  97  * Returns:     ---
  98  *
  99  * Use:         Dumps the contents of a block to the trace output.
 100  */
 101
 102 void trace_block(unsigned int l, const char *s, const void *b, size_t sz)
 103 {
 104   const unsigned char *p = b;
 105   size_t i;
 106   unsigned long o = 0;
 107   size_t c;
 108
 109   /* --- Skip if the trace level is too high --- */
 110
 111   if ((l & tracing()) == 0)
 112     return;
 113
 114   /* --- Now start work --- */
 115
 116   fprintf(trace__fp, "*** %s: %s\n", QUIS, s);
 117
 118   while (sz) {
 119     fprintf(trace__fp, "*** %s:   %08lx : ", QUIS, o);
 120     for (i = 0; i < 8; i++) {
 121       if (i < sz)
 122         fprintf(trace__fp, "%02x ", p[i]);
 123       else
 124         fputs("** ", trace__fp);
 125     }
 126     fputs(": ", trace__fp);
 127     for (i = 0; i < 8; i++) {
 128       if (i < sz)
 129         fputc(isprint(p[i]) ? p[i] : '.', trace__fp);
 130       else
 131         fputc('*', trace__fp);
 132     }
 133     fputc('\n', trace__fp);
 134     c = (sz >= 8) ? 8 : sz;
 135     sz -= c, p += c, o += c;
 136   }
 137   fflush(trace__fp);
 138 }
 139
 140 /* --- @trace_on@ --- *
 141  *
 142  * Arguments:   @FILE *fp@ = a file to trace on
 143  *              @unsigned int l@ = trace level to set
 144  *
 145  * Returns:     ---
 146  *
 147  * Use:         Enables tracing to a file.
 148  */
 149
 150 void trace_on(FILE *fp, unsigned int l)
 151 {
 152   trace__fp = fp;
 153   if (!trace__lvl)
 154     trace__lvl = l;
 155 }
 156
 157 /* --- @trace_setLevel@ --- *
 158  *
 159  * Arguments:   @unsigned int l@ = trace level to set
 160  *
 161  * Returns:     ---
 162  *
 163  * Use:         Sets the tracing level.
 164  */
 165
 166 void trace_setLevel(unsigned int l)
 167 {
 168   trace__lvl = l;
 169 }
 170
 171 /* --- @tracing@ --- *
 172  *
 173  * Arguments:   ---
 174  *
 175  * Returns:     Zero if not tracing, tracing level if tracing.
 176  *
 177  * Use:         Informs the caller whether tracing is enabled.
 178  */
 179
 180 unsigned int tracing(void)
 181 {
 182   return (trace__fp ? trace__lvl : 0u);
 183 }
 184
 185 /*----- That's all, folks -------------------------------------------------*/