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/*
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Copyright (C) 2013 Rocky Bernstein <rocky@gnu.org>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* Simple program to show how to set log verbosity and how to write a
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custom log handler.
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Invoke with an argument level, e.g.
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logging debug
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or with a number like:
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logging 1 # same as debug
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#define __CDIO_CONFIG_H__ 1
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#endif
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#ifdef HAVE_STDIO_H
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#include <stdio.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#ifdef HAVE_LIMITS_H
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#include <limits.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#include <cdio/cdio.h>
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#include <cdio/cd_types.h>
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#include <cdio/logging.h>
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/* Here is an example of a custom log handler. */
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static void
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custom_log_handler (cdio_log_level_t level, const char *message)
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{
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switch(level) {
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case CDIO_LOG_DEBUG:
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printf("-- custom debug message: %s\n", message);
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return;
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case CDIO_LOG_INFO:
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printf("-- custom info message: %s\n", message);
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return;
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case CDIO_LOG_WARN:
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printf("-- custom warning message: %s\n", message);
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return;
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case CDIO_LOG_ERROR:
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printf("-- custom error message: %s\n", message);
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return;
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case CDIO_LOG_ASSERT:
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printf("-- custom assertion message: %s\n", message);
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return;
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default:
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printf("custom level %d message: %s\n", level, message);
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}
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}
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static long
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parse_loglevel_arg(const char *ps_loglevel) {
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long loglevel;
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if (strncmp(ps_loglevel, "debug", strlen("debug")) == 0) {
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loglevel = CDIO_LOG_DEBUG;
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} else if (strncmp(ps_loglevel, "info", strlen("info")) == 0) {
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loglevel = CDIO_LOG_INFO;
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} else if (strncmp(ps_loglevel, "warn", strlen("warn")) == 0) {
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loglevel = CDIO_LOG_WARN;
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} else if (strncmp(ps_loglevel, "error", strlen("error")) == 0) {
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loglevel = CDIO_LOG_ERROR;
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} else if (strncmp(ps_loglevel, "assert", strlen("assert")) == 0) {
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loglevel = CDIO_LOG_ASSERT;
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} else {
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char *endptr;
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errno = 0; /* To distinguish success/failure after call */
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loglevel = strtol(ps_loglevel, &endptr, 10);
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/* Check for various possible errors, in parsing the verbosity
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* level. */
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if ((errno == ERANGE &&
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(loglevel == LONG_MAX || loglevel == LONG_MIN))
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|| (errno != 0 && loglevel == 0)) {
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perror("strtol conversion error of loglevel");
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exit(EXIT_FAILURE);
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}
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if (endptr == ps_loglevel) {
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fprintf(stderr, "No digits were found\n");
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exit(EXIT_FAILURE);
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}
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}
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return loglevel;
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}
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static void
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print_drives(void)
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{
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char **ppsz_cd_drives=NULL, **c;
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/* Print out a list of CD-drives with the above set log level. */
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ppsz_cd_drives = cdio_get_devices(DRIVER_DEVICE);
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if (NULL != ppsz_cd_drives)
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for( c = ppsz_cd_drives; *c != NULL; c++ ) {
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printf("-- Drive %s\n", *c);
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}
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cdio_free_device_list(ppsz_cd_drives);
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}
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int
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main(int argc, const char *argv[])
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{
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/* Set the log level to the warning verbosity. */
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cdio_loglevel_default = CDIO_LOG_WARN;
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/* Parse command arguemnts */
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if (argc > 2) {
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printf("Usage:\n%s <verbosity-level>\n"
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"Shows drives.\n"
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"A verbosity level is a name like 'debug', 'info', 'warn,'\n"
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"or a number greater than 0.\n",
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argv[0]);
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exit(EXIT_FAILURE);
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}
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if (argc == 2) {
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/* Set cdio's verbosity level. */
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cdio_loglevel_default = parse_loglevel_arg(argv[1]);
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}
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print_drives();
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/* Do the same thing again but with a custom log handler. */
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cdio_log_set_handler (custom_log_handler);
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print_drives();
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return 0;
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}
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