1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
/*
Copyright (C) 2013 Rocky Bernstein <rocky@gnu.org>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* Simple program to show how to set log verbosity and how to write a
custom log handler.
Invoke with an argument level, e.g.
logging debug
or with a number like:
logging 1 # same as debug
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#define __CDIO_CONFIG_H__ 1
#endif
#ifdef HAVE_STDIO_H
#include <stdio.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <cdio/cdio.h>
#include <cdio/cd_types.h>
#include <cdio/logging.h>
/* Here is an example of a custom log handler. */
static void
custom_log_handler (cdio_log_level_t level, const char *message)
{
switch(level) {
case CDIO_LOG_DEBUG:
printf("-- custom debug message: %s\n", message);
return;
case CDIO_LOG_INFO:
printf("-- custom info message: %s\n", message);
return;
case CDIO_LOG_WARN:
printf("-- custom warning message: %s\n", message);
return;
case CDIO_LOG_ERROR:
printf("-- custom error message: %s\n", message);
return;
case CDIO_LOG_ASSERT:
printf("-- custom assertion message: %s\n", message);
return;
default:
printf("custom level %d message: %s\n", level, message);
}
}
static long
parse_loglevel_arg(const char *ps_loglevel) {
long loglevel;
if (strncmp(ps_loglevel, "debug", strlen("debug")) == 0) {
loglevel = CDIO_LOG_DEBUG;
} else if (strncmp(ps_loglevel, "info", strlen("info")) == 0) {
loglevel = CDIO_LOG_INFO;
} else if (strncmp(ps_loglevel, "warn", strlen("warn")) == 0) {
loglevel = CDIO_LOG_WARN;
} else if (strncmp(ps_loglevel, "error", strlen("error")) == 0) {
loglevel = CDIO_LOG_ERROR;
} else if (strncmp(ps_loglevel, "assert", strlen("assert")) == 0) {
loglevel = CDIO_LOG_ASSERT;
} else {
char *endptr;
errno = 0; /* To distinguish success/failure after call */
loglevel = strtol(ps_loglevel, &endptr, 10);
/* Check for various possible errors, in parsing the verbosity
* level. */
if ((errno == ERANGE &&
(loglevel == LONG_MAX || loglevel == LONG_MIN))
|| (errno != 0 && loglevel == 0)) {
perror("strtol conversion error of loglevel");
exit(EXIT_FAILURE);
}
if (endptr == ps_loglevel) {
fprintf(stderr, "No digits were found\n");
exit(EXIT_FAILURE);
}
}
return loglevel;
}
static void
print_drives(void)
{
char **ppsz_cd_drives=NULL, **c;
/* Print out a list of CD-drives with the above set log level. */
ppsz_cd_drives = cdio_get_devices(DRIVER_DEVICE);
if (NULL != ppsz_cd_drives)
for( c = ppsz_cd_drives; *c != NULL; c++ ) {
printf("-- Drive %s\n", *c);
}
cdio_free_device_list(ppsz_cd_drives);
}
int
main(int argc, const char *argv[])
{
/* Set the log level to the warning verbosity. */
cdio_loglevel_default = CDIO_LOG_WARN;
/* Parse command arguemnts */
if (argc > 2) {
printf("Usage:\n%s <verbosity-level>\n"
"Shows drives.\n"
"A verbosity level is a name like 'debug', 'info', 'warn,'\n"
"or a number greater than 0.\n",
argv[0]);
exit(EXIT_FAILURE);
}
if (argc == 2) {
/* Set cdio's verbosity level. */
cdio_loglevel_default = parse_loglevel_arg(argv[1]);
}
print_drives();
/* Do the same thing again but with a custom log handler. */
cdio_log_set_handler (custom_log_handler);
print_drives();
return 0;
}
|
