| 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 -------------------------------------------------*/ |