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usbloadergx/source/libntfs/logging.c
giantpune 9e79c9d99b * remove little unused code 
* code cleanup
2010-09-18 23:16:05 +00:00

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/**
* logging.c - Centralised logging. Originated from the Linux-NTFS project.
*
* Copyright (c) 2005 Richard Russon
* Copyright (c) 2005-2008 Szabolcs Szakacsits
*
* This program/include file 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 2 of the License, or
* (at your option) any later version.
*
* This program/include file 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 (in the main directory of the NTFS-3G
* distribution in the file COPYING); if not, write to the Free Software
* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_STDIO_H
#include <stdio.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_STDARG_H
#include <stdarg.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_SYSLOG_H
#include <syslog.h>
#endif
#include "logging.h"
#include "misc.h"
#ifndef PATH_SEP
#define PATH_SEP '/'
#endif
#ifdef DEBUG
static int tab;
#endif
/* Some gcc 3.x, 4.[01].X crash with internal compiler error. */
#if __GNUC__ <= 3 || (__GNUC__ == 4 && __GNUC_MINOR__ <= 1)
# define BROKEN_GCC_FORMAT_ATTRIBUTE
#else
# define BROKEN_GCC_FORMAT_ATTRIBUTE __attribute__((format(printf, 6, 0)))
#endif
/**
* struct ntfs_logging - Control info for the logging system
* @levels: Bitfield of logging levels
* @flags: Flags which affect the output style
* @handler: Function to perform the actual logging
*/
struct ntfs_logging
{
u32 levels;
u32 flags;
ntfs_log_handler *handler BROKEN_GCC_FORMAT_ATTRIBUTE;
};
/**
* ntfs_log
* This struct controls all the logging within the library and tools.
*/
static struct ntfs_logging ntfs_log =
{
#ifdef DEBUG
NTFS_LOG_LEVEL_DEBUG | NTFS_LOG_LEVEL_TRACE | NTFS_LOG_LEVEL_ENTER |
NTFS_LOG_LEVEL_LEAVE |
#endif
NTFS_LOG_LEVEL_INFO | NTFS_LOG_LEVEL_QUIET | NTFS_LOG_LEVEL_WARNING |
NTFS_LOG_LEVEL_ERROR | NTFS_LOG_LEVEL_PERROR | NTFS_LOG_LEVEL_CRITICAL |
NTFS_LOG_LEVEL_PROGRESS,
NTFS_LOG_FLAG_ONLYNAME,
#ifdef DEBUG
ntfs_log_handler_outerr
#else
ntfs_log_handler_null
#endif
};
/**
* ntfs_log_get_levels - Get a list of the current logging levels
*
* Find out which logging levels are enabled.
*
* Returns: Log levels in a 32-bit field
*/
u32 ntfs_log_get_levels( void )
{
return ntfs_log.levels;
}
/**
* ntfs_log_set_levels - Enable extra logging levels
* @levels: 32-bit field of log levels to set
*
* Enable one or more logging levels.
* The logging levels are named: NTFS_LOG_LEVEL_*.
*
* Returns: Log levels that were enabled before the call
*/
u32 ntfs_log_set_levels( u32 levels )
{
u32 old;
old = ntfs_log.levels;
ntfs_log.levels |= levels;
return old;
}
/**
* ntfs_log_clear_levels - Disable some logging levels
* @levels: 32-bit field of log levels to clear
*
* Disable one or more logging levels.
* The logging levels are named: NTFS_LOG_LEVEL_*.
*
* Returns: Log levels that were enabled before the call
*/
u32 ntfs_log_clear_levels( u32 levels )
{
u32 old;
old = ntfs_log.levels;
ntfs_log.levels &= ( ~levels );
return old;
}
/**
* ntfs_log_get_flags - Get a list of logging style flags
*
* Find out which logging flags are enabled.
*
* Returns: Logging flags in a 32-bit field
*/
u32 ntfs_log_get_flags( void )
{
return ntfs_log.flags;
}
/**
* ntfs_log_set_flags - Enable extra logging style flags
* @flags: 32-bit field of logging flags to set
*
* Enable one or more logging flags.
* The log flags are named: NTFS_LOG_LEVEL_*.
*
* Returns: Logging flags that were enabled before the call
*/
u32 ntfs_log_set_flags( u32 flags )
{
u32 old;
old = ntfs_log.flags;
ntfs_log.flags |= flags;
return old;
}
/**
* ntfs_log_clear_flags - Disable some logging styles
* @flags: 32-bit field of logging flags to clear
*
* Disable one or more logging flags.
* The log flags are named: NTFS_LOG_LEVEL_*.
*
* Returns: Logging flags that were enabled before the call
*/
u32 ntfs_log_clear_flags( u32 flags )
{
u32 old;
old = ntfs_log.flags;
ntfs_log.flags &= ( ~flags );
return old;
}
/**
* ntfs_log_get_stream - Default output streams for logging levels
* @level: Log level
*
* By default, urgent messages are sent to "stderr".
* Other messages are sent to "stdout".
*
* Returns: "string" Prefix to be used
*/
static FILE * ntfs_log_get_stream( u32 level )
{
FILE *stream;
switch ( level )
{
case NTFS_LOG_LEVEL_INFO:
case NTFS_LOG_LEVEL_QUIET:
case NTFS_LOG_LEVEL_PROGRESS:
case NTFS_LOG_LEVEL_VERBOSE:
stream = stdout;
break;
case NTFS_LOG_LEVEL_DEBUG:
case NTFS_LOG_LEVEL_TRACE:
case NTFS_LOG_LEVEL_ENTER:
case NTFS_LOG_LEVEL_LEAVE:
case NTFS_LOG_LEVEL_WARNING:
case NTFS_LOG_LEVEL_ERROR:
case NTFS_LOG_LEVEL_CRITICAL:
case NTFS_LOG_LEVEL_PERROR:
default:
stream = stderr;
break;
}
return stream;
}
/**
* ntfs_log_get_prefix - Default prefixes for logging levels
* @level: Log level to be prefixed
*
* Prefixing the logging output can make it easier to parse.
*
* Returns: "string" Prefix to be used
*/
static const char * ntfs_log_get_prefix( u32 level )
{
const char *prefix;
switch ( level )
{
case NTFS_LOG_LEVEL_DEBUG:
prefix = "DEBUG: ";
break;
case NTFS_LOG_LEVEL_TRACE:
prefix = "TRACE: ";
break;
case NTFS_LOG_LEVEL_QUIET:
prefix = "QUIET: ";
break;
case NTFS_LOG_LEVEL_INFO:
prefix = "INFO: ";
break;
case NTFS_LOG_LEVEL_VERBOSE:
prefix = "VERBOSE: ";
break;
case NTFS_LOG_LEVEL_PROGRESS:
prefix = "PROGRESS: ";
break;
case NTFS_LOG_LEVEL_WARNING:
prefix = "WARNING: ";
break;
case NTFS_LOG_LEVEL_ERROR:
prefix = "ERROR: ";
break;
case NTFS_LOG_LEVEL_PERROR:
prefix = "ERROR: ";
break;
case NTFS_LOG_LEVEL_CRITICAL:
prefix = "CRITICAL: ";
break;
default:
prefix = "";
break;
}
return prefix;
}
/**
* ntfs_log_set_handler - Provide an alternate logging handler
* @handler: function to perform the logging
*
* This alternate handler will be called for all future logging requests.
* If no @handler is specified, logging will revert to the default handler.
*/
void ntfs_log_set_handler( ntfs_log_handler *handler )
{
if ( handler )
{
ntfs_log.handler = handler;
#ifdef HAVE_SYSLOG_H
if ( handler == ntfs_log_handler_syslog )
openlog( "ntfs-3g", LOG_PID, LOG_USER );
#endif
}
else
ntfs_log.handler = ntfs_log_handler_null;
}
/**
* ntfs_log_redirect - Pass on the request to the real handler
* @function: Function in which the log line occurred
* @file: File in which the log line occurred
* @line: Line number on which the log line occurred
* @level: Level at which the line is logged
* @data: User specified data, possibly specific to a handler
* @format: printf-style formatting string
* @...: Arguments to be formatted
*
* This is just a redirector function. The arguments are simply passed to the
* main logging handler (as defined in the global logging struct @ntfs_log).
*
* Returns: -1 Error occurred
* 0 Message wasn't logged
* num Number of output characters
*/
int ntfs_log_redirect( const char *function, const char *file,
int line, u32 level, void *data, const char *format, ... )
{
int olderr = errno;
int ret;
va_list args;
if ( !( ntfs_log.levels & level ) ) /* Don't log this message */
return 0;
va_start( args, format );
errno = olderr;
ret = ntfs_log.handler( function, file, line, level, data, format, args );
va_end( args );
errno = olderr;
return ret;
}
/**
* ntfs_log_handler_syslog - syslog logging handler
* @function: Function in which the log line occurred
* @file: File in which the log line occurred
* @line: Line number on which the log line occurred
* @level: Level at which the line is logged
* @data: User specified data, possibly specific to a handler
* @format: printf-style formatting string
* @args: Arguments to be formatted
*
* A simple syslog logging handler. Ignores colors.
*
* Returns: -1 Error occurred
* 0 Message wasn't logged
* num Number of output characters
*/
#ifdef HAVE_SYSLOG_H
#define LOG_LINE_LEN 512
int ntfs_log_handler_syslog( const char *function __attribute__( ( unused ) ),
const char *file __attribute__( ( unused ) ),
int line __attribute__( ( unused ) ), u32 level,
void *data __attribute__( ( unused ) ),
const char *format, va_list args )
{
char logbuf[LOG_LINE_LEN];
int ret, olderr = errno;
#ifndef DEBUG
if ( ( level & NTFS_LOG_LEVEL_PERROR ) && errno == ENOSPC )
return 1;
#endif
ret = vsnprintf( logbuf, LOG_LINE_LEN, format, args );
if ( ret < 0 )
{
vsyslog( LOG_NOTICE, format, args );
ret = 1;
goto out;
}
if ( ( LOG_LINE_LEN > ret + 3 ) && ( level & NTFS_LOG_LEVEL_PERROR ) )
{
strncat( logbuf, ": ", LOG_LINE_LEN - ret - 1 );
strncat( logbuf, strerror( olderr ), LOG_LINE_LEN - ( ret + 3 ) );
ret = strlen( logbuf );
}
syslog( LOG_NOTICE, "%s", logbuf );
out:
errno = olderr;
return ret;
}
#endif
/**
* ntfs_log_handler_fprintf - Basic logging handler
* @function: Function in which the log line occurred
* @file: File in which the log line occurred
* @line: Line number on which the log line occurred
* @level: Level at which the line is logged
* @data: User specified data, possibly specific to a handler
* @format: printf-style formatting string
* @args: Arguments to be formatted
*
* A simple logging handler. This is where the log line is finally displayed.
* It is more likely that you will want to set the handler to either
* ntfs_log_handler_outerr or ntfs_log_handler_stderr.
*
* Note: For this handler, @data is a pointer to a FILE output stream.
* If @data is NULL, nothing will be displayed.
*
* Returns: -1 Error occurred
* 0 Message wasn't logged
* num Number of output characters
*/
int ntfs_log_handler_fprintf( const char *function, const char *file,
int line, u32 level, void *data, const char *format, va_list args )
{
#ifdef DEBUG
int i;
#endif
int ret = 0;
int olderr = errno;
FILE *stream;
if ( !data ) /* Interpret data as a FILE stream. */
return 0; /* If it's NULL, we can't do anything. */
stream = ( FILE* )data;
#ifdef DEBUG
if ( level == NTFS_LOG_LEVEL_LEAVE )
{
if ( tab )
tab--;
return 0;
}
for ( i = 0; i < tab; i++ )
ret += fprintf( stream, " " );
#endif
if ( ( ntfs_log.flags & NTFS_LOG_FLAG_ONLYNAME ) &&
( strchr( file, PATH_SEP ) ) ) /* Abbreviate the filename */
file = strrchr( file, PATH_SEP ) + 1;
if ( ntfs_log.flags & NTFS_LOG_FLAG_PREFIX ) /* Prefix the output */
ret += fprintf( stream, "%s", ntfs_log_get_prefix( level ) );
if ( ntfs_log.flags & NTFS_LOG_FLAG_FILENAME ) /* Source filename */
ret += fprintf( stream, "%s ", file );
if ( ntfs_log.flags & NTFS_LOG_FLAG_LINE ) /* Source line number */
ret += fprintf( stream, "(%d) ", line );
if ( ( ntfs_log.flags & NTFS_LOG_FLAG_FUNCTION ) || /* Source function */
( level & NTFS_LOG_LEVEL_TRACE ) || ( level & NTFS_LOG_LEVEL_ENTER ) )
ret += fprintf( stream, "%s(): ", function );
ret += vfprintf( stream, format, args );
if ( level & NTFS_LOG_LEVEL_PERROR )
ret += fprintf( stream, ": %s\n", strerror( olderr ) );
#ifdef DEBUG
if ( level == NTFS_LOG_LEVEL_ENTER )
tab++;
#endif
fflush( stream );
errno = olderr;
return ret;
}
/**
* ntfs_log_handler_null - Null logging handler (no output)
* @function: Function in which the log line occurred
* @file: File in which the log line occurred
* @line: Line number on which the log line occurred
* @level: Level at which the line is logged
* @data: User specified data, possibly specific to a handler
* @format: printf-style formatting string
* @args: Arguments to be formatted
*
* This handler produces no output. It provides a way to temporarily disable
* logging, without having to change the levels and flags.
*
* Returns: 0 Message wasn't logged
*/
int ntfs_log_handler_null( const char *function __attribute__( ( unused ) ), const char *file __attribute__( ( unused ) ),
int line __attribute__( ( unused ) ), u32 level __attribute__( ( unused ) ), void *data __attribute__( ( unused ) ),
const char *format __attribute__( ( unused ) ), va_list args __attribute__( ( unused ) ) )
{
return 0;
}
/**
* ntfs_log_handler_stdout - All logs go to stdout
* @function: Function in which the log line occurred
* @file: File in which the log line occurred
* @line: Line number on which the log line occurred
* @level: Level at which the line is logged
* @data: User specified data, possibly specific to a handler
* @format: printf-style formatting string
* @args: Arguments to be formatted
*
* Display a log message to stdout.
*
* Note: For this handler, @data is a pointer to a FILE output stream.
* If @data is NULL, then stdout will be used.
*
* Note: This function calls ntfs_log_handler_fprintf to do the main work.
*
* Returns: -1 Error occurred
* 0 Message wasn't logged
* num Number of output characters
*/
int ntfs_log_handler_stdout( const char *function, const char *file,
int line, u32 level, void *data, const char *format, va_list args )
{
if ( !data )
data = stdout;
return ntfs_log_handler_fprintf( function, file, line, level, data, format, args );
}
/**
* ntfs_log_handler_outerr - Logs go to stdout/stderr depending on level
* @function: Function in which the log line occurred
* @file: File in which the log line occurred
* @line: Line number on which the log line occurred
* @level: Level at which the line is logged
* @data: User specified data, possibly specific to a handler
* @format: printf-style formatting string
* @args: Arguments to be formatted
*
* Display a log message. The output stream will be determined by the log
* level.
*
* Note: For this handler, @data is a pointer to a FILE output stream.
* If @data is NULL, the function ntfs_log_get_stream will be called
*
* Note: This function calls ntfs_log_handler_fprintf to do the main work.
*
* Returns: -1 Error occurred
* 0 Message wasn't logged
* num Number of output characters
*/
int ntfs_log_handler_outerr( const char *function, const char *file,
int line, u32 level, void *data, const char *format, va_list args )
{
if ( !data )
data = ntfs_log_get_stream( level );
return ntfs_log_handler_fprintf( function, file, line, level, data, format, args );
}
/**
* ntfs_log_handler_stderr - All logs go to stderr
* @function: Function in which the log line occurred
* @file: File in which the log line occurred
* @line: Line number on which the log line occurred
* @level: Level at which the line is logged
* @data: User specified data, possibly specific to a handler
* @format: printf-style formatting string
* @args: Arguments to be formatted
*
* Display a log message to stderr.
*
* Note: For this handler, @data is a pointer to a FILE output stream.
* If @data is NULL, then stdout will be used.
*
* Note: This function calls ntfs_log_handler_fprintf to do the main work.
*
* Returns: -1 Error occurred
* 0 Message wasn't logged
* num Number of output characters
*/
int ntfs_log_handler_stderr( const char *function, const char *file,
int line, u32 level, void *data, const char *format, va_list args )
{
if ( !data )
data = stderr;
return ntfs_log_handler_fprintf( function, file, line, level, data, format, args );
}
/**
* ntfs_log_parse_option - Act upon command line options
* @option: Option flag
*
* Delegate some of the work of parsing the command line. All the options begin
* with "--log-". Options cause log levels to be enabled in @ntfs_log (the
* global logging structure).
*
* Note: The "colour" option changes the logging handler.
*
* Returns: TRUE Option understood
* FALSE Invalid log option
*/
BOOL ntfs_log_parse_option( const char *option )
{
if ( strcmp( option, "--log-debug" ) == 0 )
{
ntfs_log_set_levels( NTFS_LOG_LEVEL_DEBUG );
return TRUE;
}
else if ( strcmp( option, "--log-verbose" ) == 0 )
{
ntfs_log_set_levels( NTFS_LOG_LEVEL_VERBOSE );
return TRUE;
}
else if ( strcmp( option, "--log-quiet" ) == 0 )
{
ntfs_log_clear_levels( NTFS_LOG_LEVEL_QUIET );
return TRUE;
}
else if ( strcmp( option, "--log-trace" ) == 0 )
{
ntfs_log_set_levels( NTFS_LOG_LEVEL_TRACE );
return TRUE;
}
ntfs_log_debug( "Unknown logging option '%s'\n", option );
return FALSE;
}
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