/* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the GLib Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GLib Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GLib at ftp://ftp.gtk.org/pub/gtk/.
*/
/*
* MT safe
*/
/**
* SECTION:warnings
* @Title: Message Output and Debugging Functions
* @Short_description: functions to output messages and help debug applications
*
* These functions provide support for outputting messages.
*
* The <function>g_return</function> family of macros (g_return_if_fail(),
* g_return_val_if_fail(), g_return_if_reached(), g_return_val_if_reached())
* should only be used for programming errors, a typical use case is
* checking for invalid parameters at the beginning of a public function.
* They should not be used if you just mean "if (error) return", they
* should only be used if you mean "if (bug in program) return".
* The program behavior is generally considered undefined after one
* of these checks fails. They are not intended for normal control
* flow, only to give a perhaps-helpful warning before giving up.
*/
#include "config.h"
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <signal.h>
#include <locale.h>
#include <errno.h>
#include "gmessages.h"
#include "glib-init.h"
#include "gbacktrace.h"
#include "gcharset.h"
#include "gconvert.h"
#include "genviron.h"
#include "gmem.h"
#include "gprintfint.h"
#include "gtestutils.h"
#include "gthread.h"
#include "gstrfuncs.h"
#include "gstring.h"
#ifdef G_OS_WIN32
#include <process.h> /* For getpid() */
#include <io.h>
# define _WIN32_WINDOWS 0x0401 /* to get IsDebuggerPresent */
# include <windows.h>
#endif
/**
* SECTION:messages
* @title: Message Logging
* @short_description: versatile support for logging messages
* with different levels of importance
*
* These functions provide support for logging error messages
* or messages used for debugging.
*
* There are several built-in levels of messages, defined in
* #GLogLevelFlags. These can be extended with user-defined levels.
*/
/**
* G_LOG_DOMAIN:
*
* Defines the log domain.
*
* For applications, this is typically left as the default %NULL
* (or "") domain. Libraries should define this so that any messages
* which they log can be differentiated from messages from other
* libraries and application code. But be careful not to define
* it in any public header files.
*
* For example, GTK+ uses this in its Makefile.am:
* |[
* INCLUDES = -DG_LOG_DOMAIN=\"Gtk\"
* ]|
*/
/**
* G_LOG_FATAL_MASK:
*
* GLib log levels that are considered fatal by default.
*/
/**
* GLogFunc:
* @log_domain: the log domain of the message
* @log_level: the log level of the message (including the
* fatal and recursion flags)
* @message: the message to process
* @user_data: user data, set in g_log_set_handler()
*
* Specifies the prototype of log handler functions.
*/
/**
* GLogLevelFlags:
* @G_LOG_FLAG_RECURSION: internal flag
* @G_LOG_FLAG_FATAL: internal flag
* @G_LOG_LEVEL_ERROR: log level for errors, see g_error().
* This level is also used for messages produced by g_assert().
* @G_LOG_LEVEL_CRITICAL: log level for critical messages, see g_critical().
* This level is also used for messages produced by g_return_if_fail()
* and g_return_val_if_fail().
* @G_LOG_LEVEL_WARNING: log level for warnings, see g_warning()
* @G_LOG_LEVEL_MESSAGE: log level for messages, see g_message()
* @G_LOG_LEVEL_INFO: log level for informational messages
* @G_LOG_LEVEL_DEBUG: log level for debug messages, see g_debug()
* @G_LOG_LEVEL_MASK: a mask including all log levels
*
* Flags specifying the level of log messages.
*
* It is possible to change how GLib treats messages of the various
* levels using g_log_set_handler() and g_log_set_fatal_mask().
*/
/**
* g_message:
* @...: format string, followed by parameters to insert
* into the format string (as with printf())
*
* A convenience function/macro to log a normal message.
*/
/**
* g_warning:
* @...: format string, followed by parameters to insert
* into the format string (as with printf())
*
* A convenience function/macro to log a warning message.
*
* You can make warnings fatal at runtime by setting the
* <envar>G_DEBUG</envar> environment variable (see
* <ulink url="glib-running.html">Running GLib Applications</ulink>).
*/
/**
* g_critical:
* @...: format string, followed by parameters to insert
* into the format string (as with printf())
*
* Logs a "critical warning" (#G_LOG_LEVEL_CRITICAL).
* It's more or less application-defined what constitutes
* a critical vs. a regular warning. You could call
* g_log_set_always_fatal() to make critical warnings exit
* the program, then use g_critical() for fatal errors, for
* example.
*
* You can also make critical warnings fatal at runtime by
* setting the <envar>G_DEBUG</envar> environment variable (see
* <ulink url="glib-running.html">Running GLib Applications</ulink>).
*/
/**
* g_error:
* @...: format string, followed by parameters to insert
* into the format string (as with printf())
*
* A convenience function/macro to log an error message.
*
* Error messages are always fatal, resulting in a call to
* abort() to terminate the application. This function will
* result in a core dump; don't use it for errors you expect.
* Using this function indicates a bug in your program, i.e.
* an assertion failure.
*
*/
/**
* g_debug:
* @...: format string, followed by parameters to insert
* into the format string (as with printf())
*
* A convenience function/macro to log a debug message.
*
* Since: 2.6
*/
/* --- structures --- */
typedef struct _GLogDomain GLogDomain;
typedef struct _GLogHandler GLogHandler;
struct _GLogDomain
{
gchar *log_domain;
GLogLevelFlags fatal_mask;
GLogHandler *handlers;
GLogDomain *next;
};
struct _GLogHandler
{
guint id;
GLogLevelFlags log_level;
GLogFunc log_func;
gpointer data;
GLogHandler *next;
};
/* --- variables --- */
static GMutex g_messages_lock;
static GLogDomain *g_log_domains = NULL;
static GPrintFunc glib_print_func = NULL;
static GPrintFunc glib_printerr_func = NULL;
static GPrivate g_log_depth;
static GLogFunc default_log_func = g_log_default_handler;
static gpointer default_log_data = NULL;
static GTestLogFatalFunc fatal_log_func = NULL;
static gpointer fatal_log_data;
/* --- functions --- */
#ifdef G_OS_WIN32
# include <windows.h>
static gboolean win32_keep_fatal_message = FALSE;
/* This default message will usually be overwritten. */
/* Yes, a fixed size buffer is bad. So sue me. But g_error() is never
* called with huge strings, is it?
*/
static gchar fatal_msg_buf[1000] = "Unspecified fatal error encountered, aborting.";
static gchar *fatal_msg_ptr = fatal_msg_buf;
#undef write
static inline int
dowrite (int fd,
const void *buf,
unsigned int len)
{
if (win32_keep_fatal_message)
{
memcpy (fatal_msg_ptr, buf, len);
fatal_msg_ptr += len;
*fatal_msg_ptr = 0;
return len;
}
write (fd, buf, len);
return len;
}
#define write(fd, buf, len) dowrite(fd, buf, len)
#endif
static void
write_string (int fd,
const gchar *string)
{
write (fd, string, strlen (string));
}
static GLogDomain*
g_log_find_domain_L (const gchar *log_domain)
{
register GLogDomain *domain;
domain = g_log_domains;
while (domain)
{
if (strcmp (domain->log_domain, log_domain) == 0)
return domain;
domain = domain->next;
}
return NULL;
}
static GLogDomain*
g_log_domain_new_L (const gchar *log_domain)
{
register GLogDomain *domain;
domain = g_new (GLogDomain, 1);
domain->log_domain = g_strdup (log_domain);
domain->fatal_mask = G_LOG_FATAL_MASK;
domain->handlers = NULL;
domain->next = g_log_domains;
g_log_domains = domain;
return domain;
}
static void
g_log_domain_check_free_L (GLogDomain *domain)
{
if (domain->fatal_mask == G_LOG_FATAL_MASK &&
domain->handlers == NULL)
{
register GLogDomain *last, *work;
last = NULL;
work = g_log_domains;
while (work)
{
if (work == domain)
{
if (last)
last->next = domain->next;
else
g_log_domains = domain->next;
g_free (domain->log_domain);
g_free (domain);
break;
}
last = work;
work = last->next;
}
}
}
static GLogFunc
g_log_domain_get_handler_L (GLogDomain *domain,
GLogLevelFlags log_level,
gpointer *data)
{
if (domain && log_level)
{
register GLogHandler *handler;
handler = domain->handlers;
while (handler)
{
if ((handler->log_level & log_level) == log_level)
{
*data = handler->data;
return handler->log_func;
}
handler = handler->next;
}
}
*data = default_log_data;
return default_log_func;
}
/**
* g_log_set_always_fatal:
* @fatal_mask: the mask containing bits set for each level
* of error which is to be fatal
*
* Sets the message levels which are always fatal, in any log domain.
* When a message with any of these levels is logged the program terminates.
* You can only set the levels defined by GLib to be fatal.
* %G_LOG_LEVEL_ERROR is always fatal.
*
* You can also make some message levels fatal at runtime by setting
* the <envar>G_DEBUG</envar> environment variable (see
* <ulink url="glib-running.html">Running GLib Applications</ulink>).
*
* Returns: the old fatal mask
*/
GLogLevelFlags
g_log_set_always_fatal (GLogLevelFlags fatal_mask)
{
GLogLevelFlags old_mask;
/* restrict the global mask to levels that are known to glib
* since this setting applies to all domains
*/
fatal_mask &= (1 << G_LOG_LEVEL_USER_SHIFT) - 1;
/* force errors to be fatal */
fatal_mask |= G_LOG_LEVEL_ERROR;
/* remove bogus flag */
fatal_mask &= ~G_LOG_FLAG_FATAL;
g_mutex_lock (&g_messages_lock);
old_mask = g_log_always_fatal;
g_log_always_fatal = fatal_mask;
g_mutex_unlock (&g_messages_lock);
return old_mask;
}
/**
* g_log_set_fatal_mask:
* @log_domain: the log domain
* @fatal_mask: the new fatal mask
*
* Sets the log levels which are fatal in the given domain.
* %G_LOG_LEVEL_ERROR is always fatal.
*
* Returns: the old fatal mask for the log domain
*/
GLogLevelFlags
g_log_set_fatal_mask (const gchar *log_domain,
GLogLevelFlags fatal_mask)
{
GLogLevelFlags old_flags;
register GLogDomain *domain;
if (!log_domain)
log_domain = "";
/* force errors to be fatal */
fatal_mask |= G_LOG_LEVEL_ERROR;
/* remove bogus flag */
fatal_mask &= ~G_LOG_FLAG_FATAL;
g_mutex_lock (&g_messages_lock);
domain = g_log_find_domain_L (log_domain);
if (!domain)
domain = g_log_domain_new_L (log_domain);
old_flags = domain->fatal_mask;
domain->fatal_mask = fatal_mask;
g_log_domain_check_free_L (domain);
g_mutex_unlock (&g_messages_lock);
return old_flags;
}
/**
* g_log_set_handler:
* @log_domain: (allow-none): the log domain, or %NULL for the default ""
* application domain
* @log_levels: the log levels to apply the log handler for.
* To handle fatal and recursive messages as well, combine
* the log levels with the #G_LOG_FLAG_FATAL and
* #G_LOG_FLAG_RECURSION bit flags.
* @log_func: the log handler function
* @user_data: data passed to the log handler
*
* Sets the log handler for a domain and a set of log levels.
* To handle fatal and recursive messages the @log_levels parameter
* must be combined with the #G_LOG_FLAG_FATAL and #G_LOG_FLAG_RECURSION
* bit flags.
*
* Note that since the #G_LOG_LEVEL_ERROR log level is always fatal, if
* you want to set a handler for this log level you must combine it with
* #G_LOG_FLAG_FATAL.
*
* <example>
* <title>Adding a log handler for all warning messages in the default
* (application) domain</title>
* <programlisting>
* g_log_set_handler (NULL, G_LOG_LEVEL_WARNING | G_LOG_FLAG_FATAL
* | G_LOG_FLAG_RECURSION, my_log_handler, NULL);
* </programlisting>
* </example>
*
* <example>
* <title>Adding a log handler for all critical messages from GTK+</title>
* <programlisting>
* g_log_set_handler ("Gtk", G_LOG_LEVEL_CRITICAL | G_LOG_FLAG_FATAL
* | G_LOG_FLAG_RECURSION, my_log_handler, NULL);
* </programlisting>
* </example>
*
* <example>
* <title>Adding a log handler for <emphasis>all</emphasis> messages from
* GLib</title>
* <programlisting>
* g_log_set_handler ("GLib", G_LOG_LEVEL_MASK | G_LOG_FLAG_FATAL
* | G_LOG_FLAG_RECURSION, my_log_handler, NULL);
* </programlisting>
* </example>
*
* Returns: the id of the new handler
*/
guint
g_log_set_handler (const gchar *log_domain,
GLogLevelFlags log_levels,
GLogFunc log_func,
gpointer user_data)
{
static guint handler_id = 0;
GLogDomain *domain;
GLogHandler *handler;
g_return_val_if_fail ((log_levels & G_LOG_LEVEL_MASK) != 0, 0);
g_return_val_if_fail (log_func != NULL, 0);
if (!log_domain)
log_domain = "";
handler = g_new (GLogHandler, 1);
g_mutex_lock (&g_messages_lock);
domain = g_log_find_domain_L (log_domain);
if (!domain)
domain = g_log_domain_new_L (log_domain);
handler->id = ++handler_id;
handler->log_level = log_levels;
handler->log_func = log_func;
handler->data = user_data;
handler->next = domain->handlers;
domain->handlers = handler;
g_mutex_unlock (&g_messages_lock);
return handler_id;
}
/**
* g_log_set_default_handler:
* @log_func: the log handler function
* @user_data: data passed to the log handler
*
* Installs a default log handler which is used if no
* log handler has been set for the particular log domain
* and log level combination. By default, GLib uses
* g_log_default_handler() as default log handler.
*
* Returns: the previous default log handler
*
* Since: 2.6
*/
GLogFunc
g_log_set_default_handler (GLogFunc log_func,
gpointer user_data)
{
GLogFunc old_log_func;
g_mutex_lock (&g_messages_lock);
old_log_func = default_log_func;
default_log_func = log_func;
default_log_data = user_data;
g_mutex_unlock (&g_messages_lock);
return old_log_func;
}
/**
* g_test_log_set_fatal_handler:
* @log_func: the log handler function.
* @user_data: data passed to the log handler.
*
* Installs a non-error fatal log handler which can be
* used to decide whether log messages which are counted
* as fatal abort the program.
*
* The use case here is that you are running a test case
* that depends on particular libraries or circumstances
* and cannot prevent certain known critical or warning
* messages. So you install a handler that compares the
* domain and message to precisely not abort in such a case.
*
* Note that the handler is reset at the beginning of
* any test case, so you have to set it inside each test
* function which needs the special behavior.
*
* This handler has no effect on g_error messages.
*
* Since: 2.22
**/
void
g_test_log_set_fatal_handler (GTestLogFatalFunc log_func,
gpointer user_data)
{
g_mutex_lock (&g_messages_lock);
fatal_log_func = log_func;
fatal_log_data = user_data;
g_mutex_unlock (&g_messages_lock);
}
/**
* g_log_remove_handler:
* @log_domain: the log domain
* @handler_id: the id of the handler, which was returned
* in g_log_set_handler()
*
* Removes the log handler.
*/
void
g_log_remove_handler (const gchar *log_domain,
guint handler_id)
{
register GLogDomain *domain;
g_return_if_fail (handler_id > 0);
if (!log_domain)
log_domain = "";
g_mutex_lock (&g_messages_lock);
domain = g_log_find_domain_L (log_domain);
if (domain)
{
GLogHandler *work, *last;
last = NULL;
work = domain->handlers;
while (work)
{
if (work->id == handler_id)
{
if (last)
last->next = work->next;
else
domain->handlers = work->next;
g_log_domain_check_free_L (domain);
g_mutex_unlock (&g_messages_lock);
g_free (work);
return;
}
last = work;
work = last->next;
}
}
g_mutex_unlock (&g_messages_lock);
g_warning ("%s: could not find handler with id `%d' for domain \"%s\"",
G_STRLOC, handler_id, log_domain);
}
/**
* g_logv:
* @log_domain: the log domain
* @log_level: the log level
* @format: the message format. See the printf() documentation
* @args: the parameters to insert into the format string
*
* Logs an error or debugging message.
*
* If the log level has been set as fatal, the abort()
* function is called to terminate the program.
*/
void
g_logv (const gchar *log_domain,
GLogLevelFlags log_level,
const gchar *format,
va_list args1)
{
gboolean was_fatal = (log_level & G_LOG_FLAG_FATAL) != 0;
gboolean was_recursion = (log_level & G_LOG_FLAG_RECURSION) != 0;
gint i;
log_level &= G_LOG_LEVEL_MASK;
if (!log_level)
return;
for (i = g_bit_nth_msf (log_level, -1); i >= 0; i = g_bit_nth_msf (log_level, i))
{
register GLogLevelFlags test_level;
test_level = 1 << i;
if (log_level & test_level)
{
GLogDomain *domain;
GLogFunc log_func;
GLogLevelFlags domain_fatal_mask;
gpointer data = NULL;
gboolean masquerade_fatal = FALSE;
guint depth;
if (was_fatal)
test_level |= G_LOG_FLAG_FATAL;
if (was_recursion)
test_level |= G_LOG_FLAG_RECURSION;
/* check recursion and lookup handler */
g_mutex_lock (&g_messages_lock);
depth = GPOINTER_TO_UINT (g_private_get (&g_log_depth));
domain = g_log_find_domain_L (log_domain ? log_domain : "");
if (depth)
test_level |= G_LOG_FLAG_RECURSION;
depth++;
domain_fatal_mask = domain ? domain->fatal_mask : G_LOG_FATAL_MASK;
if ((domain_fatal_mask | g_log_always_fatal) & test_level)
test_level |= G_LOG_FLAG_FATAL;
if (test_level & G_LOG_FLAG_RECURSION)
log_func = _g_log_fallback_handler;
else
log_func = g_log_domain_get_handler_L (domain, test_level, &data);
domain = NULL;
g_mutex_unlock (&g_messages_lock);
g_private_set (&g_log_depth, GUINT_TO_POINTER (depth));
if (test_level & G_LOG_FLAG_RECURSION)
{
/* we use a stack buffer of fixed size, since we're likely
* in an out-of-memory situation
*/
gchar buffer[1025];
gsize size G_GNUC_UNUSED;
va_list args2;
G_VA_COPY (args2, args1);
size = _g_vsnprintf (buffer, 1024, format, args2);
va_end (args2);
log_func (log_domain, test_level, buffer, data);
}
else
{
gchar *msg;
va_list args2;
G_VA_COPY (args2, args1);
msg = g_strdup_vprintf (format, args2);
va_end (args2);
log_func (log_domain, test_level, msg, data);
if ((test_level & G_LOG_FLAG_FATAL)
&& !(test_level & G_LOG_LEVEL_ERROR))
{
masquerade_fatal = fatal_log_func
&& !fatal_log_func (log_domain, test_level, msg, fatal_log_data);
}
g_free (msg);
}
if ((test_level & G_LOG_FLAG_FATAL) && !masquerade_fatal)
{
#ifdef G_OS_WIN32
gchar *locale_msg = g_locale_from_utf8 (fatal_msg_buf, -1, NULL, NULL, NULL);
MessageBox (NULL, locale_msg, NULL,
MB_ICONERROR|MB_SETFOREGROUND);
if (IsDebuggerPresent () && !(test_level & G_LOG_FLAG_RECURSION))
G_BREAKPOINT ();
else
abort ();
#else
if (!(test_level & G_LOG_FLAG_RECURSION))
G_BREAKPOINT ();
else
abort ();
#endif /* !G_OS_WIN32 */
}
depth--;
g_private_set (&g_log_depth, GUINT_TO_POINTER (depth));
}
}
}
/**
* g_log:
* @log_domain: the log domain, usually #G_LOG_DOMAIN
* @log_level: the log level, either from #GLogLevelFlags
* or a user-defined level
* @format: the message format. See the printf() documentation
* @...: the parameters to insert into the format string
*
* Logs an error or debugging message.
*
* If the log level has been set as fatal, the abort()
* function is called to terminate the program.
*/
void
g_log (const gchar *log_domain,
GLogLevelFlags log_level,
const gchar *format,
...)
{
va_list args;
va_start (args, format);
g_logv (log_domain, log_level, format, args);
va_end (args);
}
void
g_return_if_fail_warning (const char *log_domain,
const char *pretty_function,
const char *expression)
{
g_log (log_domain,
G_LOG_LEVEL_CRITICAL,
"%s: assertion `%s' failed",
pretty_function,
expression);
}
void
g_warn_message (const char *domain,
const char *file,
int line,
const char *func,
const char *warnexpr)
{
char *s, lstr[32];
g_snprintf (lstr, 32, "%d", line);
if (warnexpr)
s = g_strconcat ("(", file, ":", lstr, "):",
func, func[0] ? ":" : "",
" runtime check failed: (", warnexpr, ")", NULL);
else
s = g_strconcat ("(", file, ":", lstr, "):",
func, func[0] ? ":" : "",
" ", "code should not be reached", NULL);
g_log (domain, G_LOG_LEVEL_WARNING, "%s", s);
g_free (s);
}
void
g_assert_warning (const char *log_domain,
const char *file,
const int line,
const char *pretty_function,
const char *expression)
{
g_log (log_domain,
G_LOG_LEVEL_ERROR,
expression
? "file %s: line %d (%s): assertion failed: (%s)"
: "file %s: line %d (%s): should not be reached",
file,
line,
pretty_function,
expression);
abort ();
}
#define CHAR_IS_SAFE(wc) (!((wc < 0x20 && wc != '\t' && wc != '\n' && wc != '\r') || \
(wc == 0x7f) || \
(wc >= 0x80 && wc < 0xa0)))
static gchar*
strdup_convert (const gchar *string,
const gchar *charset)
{
if (!g_utf8_validate (string, -1, NULL))
{
GString *gstring = g_string_new ("[Invalid UTF-8] ");
guchar *p;
for (p = (guchar *)string; *p; p++)
{
if (CHAR_IS_SAFE(*p) &&
!(*p == '\r' && *(p + 1) != '\n') &&
*p < 0x80)
g_string_append_c (gstring, *p);
else
g_string_append_printf (gstring, "\\x%02x", (guint)(guchar)*p);
}
return g_string_free (gstring, FALSE);
}
else
{
GError *err = NULL;
gchar *result = g_convert_with_fallback (string, -1, charset, "UTF-8", "?", NULL, NULL, &err);
if (result)
return result;
else
{
/* Not thread-safe, but doesn't matter if we print the warning twice
*/
static gboolean warned = FALSE;
if (!warned)
{
warned = TRUE;
_g_fprintf (stderr, "GLib: Cannot convert message: %s\n", err->message);
}
g_error_free (err);
return g_strdup (string);
}
}
}
/* For a radix of 8 we need at most 3 output bytes for 1 input
* byte. Additionally we might need up to 2 output bytes for the
* readix prefix and 1 byte for the trailing NULL.
*/
#define FORMAT_UNSIGNED_BUFSIZE ((GLIB_SIZEOF_LONG * 3) + 3)
static void
format_unsigned (gchar *buf,
gulong num,
guint radix)
{
gulong tmp;
gchar c;
gint i, n;
/* we may not call _any_ GLib functions here (or macros like g_return_if_fail()) */
if (radix != 8 && radix != 10 && radix != 16)
{
*buf = '\000';
return;
}
if (!num)
{
*buf++ = '0';
*buf = '\000';
return;
}
if (radix == 16)
{
*buf++ = '0';
*buf++ = 'x';
}
else if (radix == 8)
{
*buf++ = '0';
}
n = 0;
tmp = num;
while (tmp)
{
tmp /= radix;
n++;
}
i = n;
/* Again we can't use g_assert; actually this check should _never_ fail. */
if (n > FORMAT_UNSIGNED_BUFSIZE - 3)
{
*buf = '\000';
return;
}
while (num)
{
i--;
c = (num % radix);
if (c < 10)
buf[i] = c + '0';
else
buf[i] = c + 'a' - 10;
num /= radix;
}
buf[n] = '\000';
}
/* string size big enough to hold level prefix */
#define STRING_BUFFER_SIZE (FORMAT_UNSIGNED_BUFSIZE + 32)
#define ALERT_LEVELS (G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL | G_LOG_LEVEL_WARNING)
/* these are emitted by the default log handler */
#define DEFAULT_LEVELS (G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL | G_LOG_LEVEL_WARNING | G_LOG_LEVEL_MESSAGE)
/* these are filtered by G_MESSAGES_DEBUG by the default log handler */
#define INFO_LEVELS (G_LOG_LEVEL_INFO | G_LOG_LEVEL_DEBUG)
static int
mklevel_prefix (gchar level_prefix[STRING_BUFFER_SIZE],
GLogLevelFlags log_level)
{
gboolean to_stdout = TRUE;
/* we may not call _any_ GLib functions here */
switch (log_level & G_LOG_LEVEL_MASK)
{
case G_LOG_LEVEL_ERROR:
strcpy (level_prefix, "ERROR");
to_stdout = FALSE;
break;
case G_LOG_LEVEL_CRITICAL:
strcpy (level_prefix, "CRITICAL");
to_stdout = FALSE;
break;
case G_LOG_LEVEL_WARNING:
strcpy (level_prefix, "WARNING");
to_stdout = FALSE;
break;
case G_LOG_LEVEL_MESSAGE:
strcpy (level_prefix, "Message");
to_stdout = FALSE;
break;
case G_LOG_LEVEL_INFO:
strcpy (level_prefix, "INFO");
break;
case G_LOG_LEVEL_DEBUG:
strcpy (level_prefix, "DEBUG");
break;
default:
if (log_level)
{
strcpy (level_prefix, "LOG-");
format_unsigned (level_prefix + 4, log_level & G_LOG_LEVEL_MASK, 16);
}
else
strcpy (level_prefix, "LOG");
break;
}
if (log_level & G_LOG_FLAG_RECURSION)
strcat (level_prefix, " (recursed)");
if (log_level & ALERT_LEVELS)
strcat (level_prefix, " **");
#ifdef G_OS_WIN32
win32_keep_fatal_message = (log_level & G_LOG_FLAG_FATAL) != 0;
#endif
return to_stdout ? 1 : 2;
}
void
_g_log_fallback_handler (const gchar *log_domain,
GLogLevelFlags log_level,
const gchar *message,
gpointer unused_data)
{
gchar level_prefix[STRING_BUFFER_SIZE];
#ifndef G_OS_WIN32
gchar pid_string[FORMAT_UNSIGNED_BUFSIZE];
#endif
int fd;
/* we cannot call _any_ GLib functions in this fallback handler,
* which is why we skip UTF-8 conversion, etc.
* since we either recursed or ran out of memory, we're in a pretty
* pathologic situation anyways, what we can do is giving the
* the process ID unconditionally however.
*/
fd = mklevel_prefix (level_prefix, log_level);
if (!message)
message = "(NULL) message";
#ifndef G_OS_WIN32
format_unsigned (pid_string, getpid (), 10);
#endif
if (log_domain)
write_string (fd, "\n");
else
write_string (fd, "\n** ");
#ifndef G_OS_WIN32
write_string (fd, "(process:");
write_string (fd, pid_string);
write_string (fd, "): ");
#endif
if (log_domain)
{
write_string (fd, log_domain);
write_string (fd, "-");
}
write_string (fd, level_prefix);
write_string (fd, ": ");
write_string (fd, message);
}
static void
escape_string (GString *string)
{
const char *p = string->str;
gunichar wc;
while (p < string->str + string->len)
{
gboolean safe;
wc = g_utf8_get_char_validated (p, -1);
if (wc == (gunichar)-1 || wc == (gunichar)-2)
{
gchar *tmp;
guint pos;
pos = p - string->str;
/* Emit invalid UTF-8 as hex escapes
*/
tmp = g_strdup_printf ("\\x%02x", (guint)(guchar)*p);
g_string_erase (string, pos, 1);
g_string_insert (string, pos, tmp);
p = string->str + (pos + 4); /* Skip over escape sequence */
g_free (tmp);
continue;
}
if (wc == '\r')
{
safe = *(p + 1) == '\n';
}
else
{
safe = CHAR_IS_SAFE (wc);
}
if (!safe)
{
gchar *tmp;
guint pos;
pos = p - string->str;
/* Largest char we escape is 0x0a, so we don't have to worry
* about 8-digit \Uxxxxyyyy
*/
tmp = g_strdup_printf ("\\u%04x", wc);
g_string_erase (string, pos, g_utf8_next_char (p) - p);
g_string_insert (string, pos, tmp);
g_free (tmp);
p = string->str + (pos + 6); /* Skip over escape sequence */
}
else
p = g_utf8_next_char (p);
}
}
/**
* g_log_default_handler:
* @log_domain: the log domain of the message
* @log_level: the level of the message
* @message: the message
* @unused_data: data passed from g_log() which is unused
*
* The default log handler set up by GLib; g_log_set_default_handler()
* allows to install an alternate default log handler.
* This is used if no log handler has been set for the particular log
* domain and log level combination. It outputs the message to stderr
* or stdout and if the log level is fatal it calls abort().
*
* The behavior of this log handler can be influenced by a number of
* environment variables:
* <variablelist>
* <varlistentry>
* <term><envar>G_MESSAGES_PREFIXED</envar></term>
* <listitem>
* A :-separated list of log levels for which messages should
* be prefixed by the program name and PID of the aplication.
* </listitem>
* </varlistentry>
* <varlistentry>
* <term><envar>G_MESSAGES_DEBUG</envar></term>
* <listitem>
* A space-separated list of log domains for which debug and
* informational messages are printed. By default these
* messages are not printed.
* </listitem>
* </varlistentry>
* </variablelist>
*
* stderr is used for levels %G_LOG_LEVEL_ERROR, %G_LOG_LEVEL_CRITICAL,
* %G_LOG_LEVEL_WARNING and %G_LOG_LEVEL_MESSAGE. stdout is used for
* the rest.
*/
void
g_log_default_handler (const gchar *log_domain,
GLogLevelFlags log_level,
const gchar *message,
gpointer unused_data)
{
gchar level_prefix[STRING_BUFFER_SIZE], *string;
GString *gstring;
int fd;
const gchar *domains;
if ((log_level & DEFAULT_LEVELS) || (log_level >> G_LOG_LEVEL_USER_SHIFT))
goto emit;
domains = g_getenv ("G_MESSAGES_DEBUG");
if (((log_level & INFO_LEVELS) == 0) ||
domains == NULL ||
(strcmp (domains, "all") != 0 && (!log_domain || !strstr (domains, log_domain))))
return;
emit:
/* we can be called externally with recursion for whatever reason */
if (log_level & G_LOG_FLAG_RECURSION)
{
_g_log_fallback_handler (log_domain, log_level, message, unused_data);
return;
}
fd = mklevel_prefix (level_prefix, log_level);
gstring = g_string_new (NULL);
if (log_level & ALERT_LEVELS)
g_string_append (gstring, "\n");
if (!log_domain)
g_string_append (gstring, "** ");
if ((g_log_msg_prefix & (log_level & G_LOG_LEVEL_MASK)) == (log_level & G_LOG_LEVEL_MASK))
{
const gchar *prg_name = g_get_prgname ();
if (!prg_name)
g_string_append_printf (gstring, "(process:%lu): ", (gulong)getpid ());
else
g_string_append_printf (gstring, "(%s:%lu): ", prg_name, (gulong)getpid ());
}
if (log_domain)
{
g_string_append (gstring, log_domain);
g_string_append_c (gstring, '-');
}
g_string_append (gstring, level_prefix);
g_string_append (gstring, ": ");
if (!message)
g_string_append (gstring, "(NULL) message");
else
{
GString *msg;
const gchar *charset;
msg = g_string_new (message);
escape_string (msg);
if (g_get_charset (&charset))
g_string_append (gstring, msg->str); /* charset is UTF-8 already */
else
{
string = strdup_convert (msg->str, charset);
g_string_append (gstring, string);
g_free (string);
}
g_string_free (msg, TRUE);
}
g_string_append (gstring, "\n");
string = g_string_free (gstring, FALSE);
write_string (fd, string);
g_free (string);
}
/**
* g_set_print_handler:
* @func: the new print handler
*
* Sets the print handler.
*
* Any messages passed to g_print() will be output via
* the new handler. The default handler simply outputs
* the message to stdout. By providing your own handler
* you can redirect the output, to a GTK+ widget or a
* log file for example.
*
* Returns: the old print handler
*/
GPrintFunc
g_set_print_handler (GPrintFunc func)
{
GPrintFunc old_print_func;
g_mutex_lock (&g_messages_lock);
old_print_func = glib_print_func;
glib_print_func = func;
g_mutex_unlock (&g_messages_lock);
return old_print_func;
}
/**
* g_print:
* @format: the message format. See the printf() documentation
* @...: the parameters to insert into the format string
*
* Outputs a formatted message via the print handler.
* The default print handler simply outputs the message to stdout.
*
* g_print() should not be used from within libraries for debugging
* messages, since it may be redirected by applications to special
* purpose message windows or even files. Instead, libraries should
* use g_log(), or the convenience functions g_message(), g_warning()
* and g_error().
*/
void
g_print (const gchar *format,
...)
{
va_list args;
gchar *string;
GPrintFunc local_glib_print_func;
g_return_if_fail (format != NULL);
va_start (args, format);
string = g_strdup_vprintf (format, args);
va_end (args);
g_mutex_lock (&g_messages_lock);
local_glib_print_func = glib_print_func;
g_mutex_unlock (&g_messages_lock);
if (local_glib_print_func)
local_glib_print_func (string);
else
{
const gchar *charset;
if (g_get_charset (&charset))
fputs (string, stdout); /* charset is UTF-8 already */
else
{
gchar *lstring = strdup_convert (string, charset);
fputs (lstring, stdout);
g_free (lstring);
}
fflush (stdout);
}
g_free (string);
}
/**
* g_set_printerr_handler:
* @func: the new error message handler
*
* Sets the handler for printing error messages.
*
* Any messages passed to g_printerr() will be output via
* the new handler. The default handler simply outputs the
* message to stderr. By providing your own handler you can
* redirect the output, to a GTK+ widget or a log file for
* example.
*
* Returns: the old error message handler
*/
GPrintFunc
g_set_printerr_handler (GPrintFunc func)
{
GPrintFunc old_printerr_func;
g_mutex_lock (&g_messages_lock);
old_printerr_func = glib_printerr_func;
glib_printerr_func = func;
g_mutex_unlock (&g_messages_lock);
return old_printerr_func;
}
/**
* g_printerr:
* @format: the message format. See the printf() documentation
* @...: the parameters to insert into the format string
*
* Outputs a formatted message via the error message handler.
* The default handler simply outputs the message to stderr.
*
* g_printerr() should not be used from within libraries.
* Instead g_log() should be used, or the convenience functions
* g_message(), g_warning() and g_error().
*/
void
g_printerr (const gchar *format,
...)
{
va_list args;
gchar *string;
GPrintFunc local_glib_printerr_func;
g_return_if_fail (format != NULL);
va_start (args, format);
string = g_strdup_vprintf (format, args);
va_end (args);
g_mutex_lock (&g_messages_lock);
local_glib_printerr_func = glib_printerr_func;
g_mutex_unlock (&g_messages_lock);
if (local_glib_printerr_func)
local_glib_printerr_func (string);
else
{
const gchar *charset;
if (g_get_charset (&charset))
fputs (string, stderr); /* charset is UTF-8 already */
else
{
gchar *lstring = strdup_convert (string, charset);
fputs (lstring, stderr);
g_free (lstring);
}
fflush (stderr);
}
g_free (string);
}
/**
* g_printf_string_upper_bound:
* @format: the format string. See the printf() documentation
* @args: the parameters to be inserted into the format string
*
* Calculates the maximum space needed to store the output
* of the sprintf() function.
*
* Returns: the maximum space needed to store the formatted string
*/
gsize
g_printf_string_upper_bound (const gchar *format,
va_list args)
{
gchar c;
return _g_vsnprintf (&c, 1, format, args) + 1;
}