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1 | /* -*-c-*- |
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2 | * |
3 | * Tracing functions for debugging |
4 | * |
5 | * (c) 1998 Straylight/Edgeware |
6 | */ |
7 | |
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8 | /*----- Licensing notice --------------------------------------------------* |
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9 | * |
10 | * This file is part of the mLib utilities library. |
11 | * |
12 | * mLib is free software; you can redistribute it and/or modify |
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13 | * it under the terms of the GNU Library General Public License as |
14 | * published by the Free Software Foundation; either version 2 of the |
15 | * License, or (at your option) any later version. |
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16 | * |
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17 | * mLib is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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20 | * GNU Library General Public License for more details. |
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21 | * |
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22 | * You should have received a copy of the GNU Library General Public |
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23 | * License along with mLib; if not, write to the Free |
24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
25 | * MA 02111-1307, USA. |
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26 | */ |
27 | |
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28 | /*----- Header files ------------------------------------------------------*/ |
29 | |
30 | /* --- ANSI headers --- */ |
31 | |
32 | #include <ctype.h> |
33 | #include <stdarg.h> |
34 | #include <stdio.h> |
35 | #include <stdlib.h> |
36 | #include <string.h> |
37 | |
38 | /* --- Local headers --- */ |
39 | |
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40 | #include "dstr.h" |
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41 | #include "quis.h" |
42 | #include "trace.h" |
43 | |
44 | /*----- Private state information -----------------------------------------*/ |
45 | |
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46 | static void (*tracefunc)(const char *buf, size_t sz, void *v) = 0; |
47 | static void *tracearg; |
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48 | static unsigned tracelvl = 0; /* How much tracing gets done? */ |
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49 | |
50 | /*----- Functions provided ------------------------------------------------*/ |
51 | |
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52 | /* --- @t_file@ --- * |
53 | * |
54 | * Arguments: @const char *buf@ = buffer to print |
55 | * @size_t sz@ = buffer size |
56 | * @void *v@ = file handle |
57 | * |
58 | * Returns: --- |
59 | * |
60 | * Use: Dumps tracing information to a file. |
61 | */ |
62 | |
63 | static void t_file(const char *buf, size_t sz, void *v) |
64 | { |
65 | FILE *fp = v; |
66 | fprintf(fp, "+ %s: ", QUIS); |
67 | fwrite(buf, 1, sz, fp); |
68 | fputc('\n', fp); |
69 | } |
70 | |
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71 | /* --- @trace@ --- * |
72 | * |
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73 | * Arguments: @unsigned l@ = trace level for output |
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74 | * @const char *f@ = a @printf@-style format string |
75 | * @...@ = other arguments |
76 | * |
77 | * Returns: --- |
78 | * |
79 | * Use: Reports a message to the trace output. |
80 | */ |
81 | |
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82 | void trace(unsigned l, const char *f, ...) |
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83 | { |
84 | va_list ap; |
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85 | dstr d = DSTR_INIT; |
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86 | if ((l & tracing()) == 0) |
87 | return; |
88 | va_start(ap, f); |
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89 | dstr_vputf(&d, f, &ap); |
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90 | va_end(ap); |
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91 | tracefunc(d.buf, d.len, tracearg); |
92 | dstr_destroy(&d); |
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93 | } |
94 | |
95 | /* --- @trace_block@ --- * |
96 | * |
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97 | * Arguments: @unsigned l@ = trace level for output |
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98 | * @const char *s@ = some header string to write |
99 | * @const void *b@ = pointer to a block of memory to dump |
100 | * @size_t sz@ = size of the block of memory |
101 | * |
102 | * Returns: --- |
103 | * |
104 | * Use: Dumps the contents of a block to the trace output. |
105 | */ |
106 | |
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107 | void trace_block(unsigned l, const char *s, const void *b, size_t sz) |
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108 | { |
109 | const unsigned char *p = b; |
110 | size_t i; |
111 | unsigned long o = 0; |
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112 | dstr d = DSTR_INIT; |
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113 | size_t c; |
114 | |
115 | /* --- Skip if the trace level is too high --- */ |
116 | |
117 | if ((l & tracing()) == 0) |
118 | return; |
119 | |
120 | /* --- Now start work --- */ |
121 | |
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122 | tracefunc(s, strlen(s), tracearg); |
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123 | while (sz) { |
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124 | dstr_reset(&d); |
125 | dstr_putf(&d, " %08lx : ", o); |
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126 | for (i = 0; i < 8; i++) { |
127 | if (i < sz) |
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128 | dstr_putf(&d, "%02x ", p[i]); |
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129 | else |
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130 | dstr_puts(&d, "** "); |
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131 | } |
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132 | dstr_puts(&d, ": "); |
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133 | for (i = 0; i < 8; i++) { |
134 | if (i < sz) |
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135 | dstr_putc(&d, isprint(p[i]) ? p[i] : '.'); |
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136 | else |
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137 | dstr_putc(&d, '*'); |
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138 | } |
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139 | dstr_putz(&d); |
140 | tracefunc(d.buf, d.len, tracearg); |
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141 | c = (sz >= 8) ? 8 : sz; |
142 | sz -= c, p += c, o += c; |
143 | } |
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144 | dstr_destroy(&d); |
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145 | } |
146 | |
147 | /* --- @trace_on@ --- * |
148 | * |
149 | * Arguments: @FILE *fp@ = a file to trace on |
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150 | * @unsigned l@ = trace level to set |
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151 | * |
152 | * Returns: --- |
153 | * |
154 | * Use: Enables tracing to a file. |
155 | */ |
156 | |
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157 | void trace_on(FILE *fp, unsigned l) |
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158 | { |
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159 | tracefunc = t_file; |
160 | tracearg = fp; |
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161 | if (!tracelvl) |
162 | tracelvl = l; |
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163 | } |
164 | |
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165 | /* --- @trace_custom@ --- * |
166 | * |
167 | * Arguments: @void (*func)(const char *buf, size_t sz, void *v)@ = |
168 | * output function |
169 | * @void *v@ = magic handle to give to function |
170 | * |
171 | * Returns: --- |
172 | * |
173 | * Use: Sets up a custom trace handler. |
174 | */ |
175 | |
176 | void trace_custom(void (*func)(const char */*buf*/, |
177 | size_t /*sz*/, void */*v*/), |
178 | void *v) |
179 | { |
180 | tracefunc = func; |
181 | tracearg = v; |
182 | } |
183 | |
184 | /* --- @trace_level@ --- * |
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185 | * |
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186 | * Arguments: @unsigned l@ = trace level to set |
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187 | * |
188 | * Returns: --- |
189 | * |
190 | * Use: Sets the tracing level. |
191 | */ |
192 | |
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193 | void trace_level(unsigned l) |
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194 | { |
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195 | tracelvl = l; |
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196 | } |
197 | |
198 | /* --- @tracing@ --- * |
199 | * |
200 | * Arguments: --- |
201 | * |
202 | * Returns: Zero if not tracing, tracing level if tracing. |
203 | * |
204 | * Use: Informs the caller whether tracing is enabled. |
205 | */ |
206 | |
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207 | unsigned tracing(void) |
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208 | { |
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209 | return (tracefunc ? tracelvl : 0u); |
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210 | } |
211 | |
212 | /*----- That's all, folks -------------------------------------------------*/ |