pcsc-lite  1.9.4
debug.c
Go to the documentation of this file.
1 /*
2  * MUSCLE SmartCard Development ( https://pcsclite.apdu.fr/ )
3  *
4  * Copyright (C) 1999-2002
5  * David Corcoran <corcoran@musclecard.com>
6  * Copyright (C) 2002-2011
7  * Ludovic Rousseau <ludovic.rousseau@free.fr>
8  *
9 Redistribution and use in source and binary forms, with or without
10 modification, are permitted provided that the following conditions
11 are met:
12 
13 1. Redistributions of source code must retain the above copyright
14  notice, this list of conditions and the following disclaimer.
15 2. Redistributions in binary form must reproduce the above copyright
16  notice, this list of conditions and the following disclaimer in the
17  documentation and/or other materials provided with the distribution.
18 3. The name of the author may not be used to endorse or promote products
19  derived from this software without specific prior written permission.
20 
21 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31  */
32 
38 #include "config.h"
39 #include "misc.h"
40 #include <stdarg.h>
41 #include <stdlib.h>
42 #include <unistd.h>
43 #include <string.h>
44 #include <stdio.h>
45 
46 /* We shall not export the log_msg() sumbol */
47 #undef PCSC_API
48 #include "debuglog.h"
49 
50 #define DEBUG_BUF_SIZE 2048
51 
52 #ifdef NO_LOG
53 
54 void log_msg(const int priority, const char *fmt, ...)
55 {
56  (void)priority;
57  (void)fmt;
58 }
59 
60 #else
61 
63 static char LogLevel = PCSC_LOG_CRITICAL+1;
64 
65 static signed char LogDoColor = 0;
67 static void log_init(void)
68 {
69  char *e;
70 
71  e = getenv("PCSCLITE_DEBUG");
72  if (e)
73  LogLevel = atoi(e);
74 
75  /* log to stderr and stderr is a tty? */
76  if (isatty(fileno(stderr)))
77  {
78  char *term;
79 
80  term = getenv("TERM");
81  if (term)
82  {
83  const char *terms[] = { "linux", "xterm", "xterm-color", "Eterm", "rxvt", "rxvt-unicode" };
84  unsigned int i;
85 
86  /* for each known color terminal */
87  for (i = 0; i < COUNT_OF(terms); i++)
88  {
89  /* we found a supported term? */
90  if (0 == strcmp(terms[i], term))
91  {
92  LogDoColor = 1;
93  break;
94  }
95  }
96  }
97  }
98 } /* log_init */
99 
100 void log_msg(const int priority, const char *fmt, ...)
101 {
102  char DebugBuffer[DEBUG_BUF_SIZE];
103  va_list argptr;
104  static int is_initialized = 0;
105 
106  if (!is_initialized)
107  {
108  log_init();
109  is_initialized = 1;
110  }
111 
112  if (priority < LogLevel) /* log priority lower than threshold? */
113  return;
114 
115  va_start(argptr, fmt);
116  (void)vsnprintf(DebugBuffer, DEBUG_BUF_SIZE, fmt, argptr);
117  va_end(argptr);
118 
119  {
120  if (LogDoColor)
121  {
122  const char *color_pfx = "", *color_sfx = "\33[0m";
123 
124  switch (priority)
125  {
126  case PCSC_LOG_CRITICAL:
127  color_pfx = "\33[01;31m"; /* bright + Red */
128  break;
129 
130  case PCSC_LOG_ERROR:
131  color_pfx = "\33[35m"; /* Magenta */
132  break;
133 
134  case PCSC_LOG_INFO:
135  color_pfx = "\33[34m"; /* Blue */
136  break;
137 
138  case PCSC_LOG_DEBUG:
139  color_pfx = ""; /* normal (black) */
140  color_sfx = "";
141  break;
142  }
143  fprintf(stderr, "%s%s%s\n", color_pfx, DebugBuffer, color_sfx);
144  }
145  else
146  fprintf(stderr, "%s\n", DebugBuffer);
147  }
148 } /* log_msg */
149 
150 #endif
151 
static char LogLevel
default level is quiet to avoid polluting fd 2 (possibly NOT stderr)
Definition: debug.c:63
static signed char LogDoColor
no color by default
Definition: debug.c:65
#define DEBUG_BUF_SIZE
Max string size dumping a maxmium of 2 lines of 80 characters.
Definition: debuglog.c:105
This handles debugging.