mirror of
https://github.com/brl/mutter.git
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d2c41502a4
This commit pushes --disable-glib to the extreme of embedding the par of glib cogl depends on in tree to be able to generate a DSO that does not depend on an external glib. To do so, it: - keeps a lot of glib's configure.ac in as-glibconfig.m4 - pulls the code cogl depends on and the necessary dependencies Reviewed-by: Robert Bragg <robert@linux.intel.com>
712 lines
21 KiB
C
712 lines
21 KiB
C
/* GLIB - Library of useful routines for C programming
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/*
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* Modified by the GLib Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GLib Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GLib at ftp://ftp.gtk.org/pub/gtk/.
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*/
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/**
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* SECTION:error_reporting
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* @Title: Error Reporting
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* @Short_description: a system for reporting errors
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*
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* GLib provides a standard method of reporting errors from a called
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* function to the calling code. (This is the same problem solved by
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* exceptions in other languages.) It's important to understand that
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* this method is both a <emphasis>data type</emphasis> (the #GError
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* object) and a <emphasis>set of rules.</emphasis> If you use #GError
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* incorrectly, then your code will not properly interoperate with other
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* code that uses #GError, and users of your API will probably get confused.
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*
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* First and foremost: <emphasis>#GError should only be used to report
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* recoverable runtime errors, never to report programming
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* errors.</emphasis> If the programmer has screwed up, then you should
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* use g_warning(), g_return_if_fail(), g_assert(), g_error(), or some
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* similar facility. (Incidentally, remember that the g_error() function
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* should <emphasis>only</emphasis> be used for programming errors, it
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* should not be used to print any error reportable via #GError.)
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*
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* Examples of recoverable runtime errors are "file not found" or
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* "failed to parse input." Examples of programming errors are "NULL
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* passed to strcmp()" or "attempted to free the same pointer twice."
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* These two kinds of errors are fundamentally different: runtime errors
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* should be handled or reported to the user, programming errors should
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* be eliminated by fixing the bug in the program. This is why most
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* functions in GLib and GTK+ do not use the #GError facility.
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*
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* Functions that can fail take a return location for a #GError as their
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* last argument. For example:
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* |[
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* gboolean g_file_get_contents (const gchar *filename,
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* gchar **contents,
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* gsize *length,
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* GError **error);
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* ]|
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* If you pass a non-%NULL value for the <literal>error</literal>
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* argument, it should point to a location where an error can be placed.
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* For example:
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* |[
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* gchar *contents;
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* GError *err = NULL;
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* g_file_get_contents ("foo.txt", &contents, NULL, &err);
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* g_assert ((contents == NULL && err != NULL) || (contents != NULL && err == NULL));
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* if (err != NULL)
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* {
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* /* Report error to user, and free error */
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* g_assert (contents == NULL);
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* fprintf (stderr, "Unable to read file: %s\n", err->message);
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* g_error_free (err);
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* }
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* else
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* {
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* /* Use file contents */
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* g_assert (contents != NULL);
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* }
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* ]|
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* Note that <literal>err != NULL</literal> in this example is a
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* <emphasis>reliable</emphasis> indicator of whether
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* g_file_get_contents() failed. Additionally, g_file_get_contents()
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* returns a boolean which indicates whether it was successful.
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*
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* Because g_file_get_contents() returns %FALSE on failure, if you
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* are only interested in whether it failed and don't need to display
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* an error message, you can pass %NULL for the <literal>error</literal>
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* argument:
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* |[
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* if (g_file_get_contents ("foo.txt", &contents, NULL, NULL)) /* ignore errors */
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* /* no error occurred */ ;
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* else
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* /* error */ ;
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* ]|
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*
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* The #GError object contains three fields: <literal>domain</literal>
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* indicates the module the error-reporting function is located in,
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* <literal>code</literal> indicates the specific error that occurred,
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* and <literal>message</literal> is a user-readable error message with
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* as many details as possible. Several functions are provided to deal
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* with an error received from a called function: g_error_matches()
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* returns %TRUE if the error matches a given domain and code,
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* g_propagate_error() copies an error into an error location (so the
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* calling function will receive it), and g_clear_error() clears an
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* error location by freeing the error and resetting the location to
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* %NULL. To display an error to the user, simply display
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* <literal>error->message</literal>, perhaps along with additional
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* context known only to the calling function (the file being opened,
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* or whatever -- though in the g_file_get_contents() case,
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* <literal>error->message</literal> already contains a filename).
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*
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* When implementing a function that can report errors, the basic
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* tool is g_set_error(). Typically, if a fatal error occurs you
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* want to g_set_error(), then return immediately. g_set_error()
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* does nothing if the error location passed to it is %NULL.
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* Here's an example:
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* |[
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* gint
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* foo_open_file (GError **error)
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* {
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* gint fd;
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*
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* fd = open ("file.txt", O_RDONLY);
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*
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* if (fd < 0)
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* {
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* g_set_error (error,
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* FOO_ERROR, /* error domain */
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* FOO_ERROR_BLAH, /* error code */
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* "Failed to open file: %s", /* error message format string */
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* g_strerror (errno));
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* return -1;
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* }
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* else
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* return fd;
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* }
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* ]|
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*
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* Things are somewhat more complicated if you yourself call another
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* function that can report a #GError. If the sub-function indicates
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* fatal errors in some way other than reporting a #GError, such as
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* by returning %TRUE on success, you can simply do the following:
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* |[
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* gboolean
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* my_function_that_can_fail (GError **err)
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* {
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* g_return_val_if_fail (err == NULL || *err == NULL, FALSE);
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*
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* if (!sub_function_that_can_fail (err))
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* {
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* /* assert that error was set by the sub-function */
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* g_assert (err == NULL || *err != NULL);
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* return FALSE;
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* }
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*
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* /* otherwise continue, no error occurred */
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* g_assert (err == NULL || *err == NULL);
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* }
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* ]|
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*
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* If the sub-function does not indicate errors other than by
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* reporting a #GError, you need to create a temporary #GError
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* since the passed-in one may be %NULL. g_propagate_error() is
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* intended for use in this case.
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* |[
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* gboolean
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* my_function_that_can_fail (GError **err)
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* {
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* GError *tmp_error;
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*
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* g_return_val_if_fail (err == NULL || *err == NULL, FALSE);
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*
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* tmp_error = NULL;
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* sub_function_that_can_fail (&tmp_error);
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*
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* if (tmp_error != NULL)
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* {
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* /* store tmp_error in err, if err != NULL,
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* * otherwise call g_error_free() on tmp_error
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* */
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* g_propagate_error (err, tmp_error);
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* return FALSE;
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* }
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*
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* /* otherwise continue, no error occurred */
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* }
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* ]|
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*
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* Error pileups are always a bug. For example, this code is incorrect:
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* |[
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* gboolean
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* my_function_that_can_fail (GError **err)
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* {
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* GError *tmp_error;
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*
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* g_return_val_if_fail (err == NULL || *err == NULL, FALSE);
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*
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* tmp_error = NULL;
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* sub_function_that_can_fail (&tmp_error);
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* other_function_that_can_fail (&tmp_error);
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*
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* if (tmp_error != NULL)
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* {
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* g_propagate_error (err, tmp_error);
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* return FALSE;
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* }
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* }
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* ]|
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* <literal>tmp_error</literal> should be checked immediately after
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* sub_function_that_can_fail(), and either cleared or propagated
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* upward. The rule is: <emphasis>after each error, you must either
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* handle the error, or return it to the calling function</emphasis>.
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* Note that passing %NULL for the error location is the equivalent
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* of handling an error by always doing nothing about it. So the
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* following code is fine, assuming errors in sub_function_that_can_fail()
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* are not fatal to my_function_that_can_fail():
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* |[
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* gboolean
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* my_function_that_can_fail (GError **err)
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* {
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* GError *tmp_error;
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*
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* g_return_val_if_fail (err == NULL || *err == NULL, FALSE);
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*
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* sub_function_that_can_fail (NULL); /* ignore errors */
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*
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* tmp_error = NULL;
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* other_function_that_can_fail (&tmp_error);
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*
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* if (tmp_error != NULL)
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* {
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* g_propagate_error (err, tmp_error);
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* return FALSE;
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* }
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* }
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* ]|
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*
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* Note that passing %NULL for the error location
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* <emphasis>ignores</emphasis> errors; it's equivalent to
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* <literal>try { sub_function_that_can_fail (); } catch (...) {}</literal>
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* in C++. It does <emphasis>not</emphasis> mean to leave errors
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* unhandled; it means to handle them by doing nothing.
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*
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* Error domains and codes are conventionally named as follows:
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* <itemizedlist>
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* <listitem><para>
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* The error domain is called
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* <literal><NAMESPACE>_<MODULE>_ERROR</literal>,
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* for example %G_SPAWN_ERROR or %G_THREAD_ERROR:
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* |[
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* #define G_SPAWN_ERROR g_spawn_error_quark ()
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*
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* GQuark
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* g_spawn_error_quark (void)
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* {
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* return g_quark_from_static_string ("g-spawn-error-quark");
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* }
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* ]|
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* </para></listitem>
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* <listitem><para>
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* The quark function for the error domain is called
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* <literal><namespace>_<module>_error_quark</literal>,
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* for example g_spawn_error_quark() or %g_thread_error_quark().
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* </para></listitem>
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* <listitem><para>
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* The error codes are in an enumeration called
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* <literal><Namespace><Module>Error</literal>;
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* for example,#GThreadError or #GSpawnError.
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* </para></listitem>
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* <listitem><para>
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* Members of the error code enumeration are called
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* <literal><NAMESPACE>_<MODULE>_ERROR_<CODE></literal>,
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* for example %G_SPAWN_ERROR_FORK or %G_THREAD_ERROR_AGAIN.
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* </para></listitem>
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* <listitem><para>
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* If there's a "generic" or "unknown" error code for unrecoverable
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* errors it doesn't make sense to distinguish with specific codes,
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* it should be called <literal><NAMESPACE>_<MODULE>_ERROR_FAILED</literal>,
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* for example %G_SPAWN_ERROR_FAILED or %G_THREAD_ERROR_FAILED.
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* </para></listitem>
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* </itemizedlist>
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*
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* Summary of rules for use of #GError:
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* <itemizedlist>
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* <listitem><para>
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* Do not report programming errors via #GError.
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* </para></listitem>
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* <listitem><para>
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* The last argument of a function that returns an error should
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* be a location where a #GError can be placed (i.e. "#GError** error").
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* If #GError is used with varargs, the #GError** should be the last
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* argument before the "...".
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* </para></listitem>
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* <listitem><para>
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* The caller may pass %NULL for the #GError** if they are not interested
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* in details of the exact error that occurred.
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* </para></listitem>
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* <listitem><para>
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* If %NULL is passed for the #GError** argument, then errors should
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* not be returned to the caller, but your function should still
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* abort and return if an error occurs. That is, control flow should
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* not be affected by whether the caller wants to get a #GError.
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* </para></listitem>
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* <listitem><para>
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* If a #GError is reported, then your function by definition
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* <emphasis>had a fatal failure and did not complete whatever
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* it was supposed to do</emphasis>. If the failure was not fatal,
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* then you handled it and you should not report it. If it was fatal,
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* then you must report it and discontinue whatever you were doing
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* immediately.
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* </para></listitem>
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* <listitem><para>
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* A #GError* must be initialized to %NULL before passing its address
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* to a function that can report errors.
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* </para></listitem>
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* <listitem><para>
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* "Piling up" errors is always a bug. That is, if you assign a
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* new #GError to a #GError* that is non-%NULL, thus overwriting
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* the previous error, it indicates that you should have aborted
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* the operation instead of continuing. If you were able to continue,
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* you should have cleared the previous error with g_clear_error().
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* g_set_error() will complain if you pile up errors.
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* </para></listitem>
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* <listitem><para>
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* By convention, if you return a boolean value indicating success
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* then %TRUE means success and %FALSE means failure. If %FALSE is
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* returned, the error <emphasis>must</emphasis> be set to a non-%NULL
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* value.
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* </para></listitem>
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* <listitem><para>
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* A %NULL return value is also frequently used to mean that an error
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* occurred. You should make clear in your documentation whether %NULL
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* is a valid return value in non-error cases; if %NULL is a valid value,
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* then users must check whether an error was returned to see if the
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* function succeeded.
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* </para></listitem>
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* <listitem><para>
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* When implementing a function that can report errors, you may want
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* to add a check at the top of your function that the error return
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* location is either %NULL or contains a %NULL error (e.g.
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* <literal>g_return_if_fail (error == NULL || *error == NULL);</literal>).
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* </para></listitem>
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* </itemizedlist>
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*/
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#include "config.h"
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#include "gerror.h"
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#include "gstrfuncs.h"
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#include "gtestutils.h"
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/**
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* g_error_new_valist:
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* @domain: error domain
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* @code: error code
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* @format: printf()-style format for error message
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* @args: #va_list of parameters for the message format
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*
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* Creates a new #GError with the given @domain and @code,
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* and a message formatted with @format.
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*
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* Returns: a new #GError
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*
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* Since: 2.22
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*/
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GError*
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g_error_new_valist (GQuark domain,
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gint code,
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const gchar *format,
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va_list args)
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{
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GError *error;
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error = g_slice_new (GError);
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error->domain = domain;
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error->code = code;
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error->message = g_strdup_vprintf (format, args);
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return error;
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}
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/**
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* g_error_new:
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* @domain: error domain
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* @code: error code
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* @format: printf()-style format for error message
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* @...: parameters for message format
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*
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* Creates a new #GError with the given @domain and @code,
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* and a message formatted with @format.
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*
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* Return value: a new #GError
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*/
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GError*
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g_error_new (GQuark domain,
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gint code,
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const gchar *format,
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...)
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{
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GError* error;
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va_list args;
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g_return_val_if_fail (format != NULL, NULL);
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g_return_val_if_fail (domain != 0, NULL);
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va_start (args, format);
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error = g_error_new_valist (domain, code, format, args);
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va_end (args);
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return error;
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}
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/**
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* g_error_new_literal:
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* @domain: error domain
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* @code: error code
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* @message: error message
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*
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* Creates a new #GError; unlike g_error_new(), @message is
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* not a printf()-style format string. Use this function if
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* @message contains text you don't have control over,
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* that could include printf() escape sequences.
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*
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* Return value: a new #GError
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**/
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GError*
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g_error_new_literal (GQuark domain,
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gint code,
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const gchar *message)
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{
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GError* err;
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g_return_val_if_fail (message != NULL, NULL);
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g_return_val_if_fail (domain != 0, NULL);
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err = g_slice_new (GError);
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err->domain = domain;
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err->code = code;
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err->message = g_strdup (message);
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return err;
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}
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/**
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* g_error_free:
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* @error: a #GError
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*
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* Frees a #GError and associated resources.
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*/
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void
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g_error_free (GError *error)
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{
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g_return_if_fail (error != NULL);
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g_free (error->message);
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g_slice_free (GError, error);
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}
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/**
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* g_error_copy:
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* @error: a #GError
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*
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* Makes a copy of @error.
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*
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* Return value: a new #GError
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*/
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GError*
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g_error_copy (const GError *error)
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{
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GError *copy;
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g_return_val_if_fail (error != NULL, NULL);
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copy = g_slice_new (GError);
|
|
|
|
*copy = *error;
|
|
|
|
copy->message = g_strdup (error->message);
|
|
|
|
return copy;
|
|
}
|
|
|
|
/**
|
|
* g_error_matches:
|
|
* @error: a #GError or %NULL
|
|
* @domain: an error domain
|
|
* @code: an error code
|
|
*
|
|
* Returns %TRUE if @error matches @domain and @code, %FALSE
|
|
* otherwise. In particular, when @error is %NULL, %FALSE will
|
|
* be returned.
|
|
*
|
|
* Return value: whether @error has @domain and @code
|
|
*/
|
|
gboolean
|
|
g_error_matches (const GError *error,
|
|
GQuark domain,
|
|
gint code)
|
|
{
|
|
return error &&
|
|
error->domain == domain &&
|
|
error->code == code;
|
|
}
|
|
|
|
#define ERROR_OVERWRITTEN_WARNING "GError set over the top of a previous GError or uninitialized memory.\n" \
|
|
"This indicates a bug in someone's code. You must ensure an error is NULL before it's set.\n" \
|
|
"The overwriting error message was: %s"
|
|
|
|
/**
|
|
* g_set_error:
|
|
* @err: a return location for a #GError, or %NULL
|
|
* @domain: error domain
|
|
* @code: error code
|
|
* @format: printf()-style format
|
|
* @...: args for @format
|
|
*
|
|
* Does nothing if @err is %NULL; if @err is non-%NULL, then *@err
|
|
* must be %NULL. A new #GError is created and assigned to *@err.
|
|
*/
|
|
void
|
|
g_set_error (GError **err,
|
|
GQuark domain,
|
|
gint code,
|
|
const gchar *format,
|
|
...)
|
|
{
|
|
GError *new;
|
|
|
|
va_list args;
|
|
|
|
if (err == NULL)
|
|
return;
|
|
|
|
va_start (args, format);
|
|
new = g_error_new_valist (domain, code, format, args);
|
|
va_end (args);
|
|
|
|
if (*err == NULL)
|
|
*err = new;
|
|
else
|
|
g_warning (ERROR_OVERWRITTEN_WARNING, new->message);
|
|
}
|
|
|
|
/**
|
|
* g_set_error_literal:
|
|
* @err: a return location for a #GError, or %NULL
|
|
* @domain: error domain
|
|
* @code: error code
|
|
* @message: error message
|
|
*
|
|
* Does nothing if @err is %NULL; if @err is non-%NULL, then *@err
|
|
* must be %NULL. A new #GError is created and assigned to *@err.
|
|
* Unlike g_set_error(), @message is not a printf()-style format string.
|
|
* Use this function if @message contains text you don't have control over,
|
|
* that could include printf() escape sequences.
|
|
*
|
|
* Since: 2.18
|
|
*/
|
|
void
|
|
g_set_error_literal (GError **err,
|
|
GQuark domain,
|
|
gint code,
|
|
const gchar *message)
|
|
{
|
|
GError *new;
|
|
|
|
if (err == NULL)
|
|
return;
|
|
|
|
new = g_error_new_literal (domain, code, message);
|
|
if (*err == NULL)
|
|
*err = new;
|
|
else
|
|
g_warning (ERROR_OVERWRITTEN_WARNING, new->message);
|
|
}
|
|
|
|
/**
|
|
* g_propagate_error:
|
|
* @dest: error return location
|
|
* @src: error to move into the return location
|
|
*
|
|
* If @dest is %NULL, free @src; otherwise, moves @src into *@dest.
|
|
* The error variable @dest points to must be %NULL.
|
|
*/
|
|
void
|
|
g_propagate_error (GError **dest,
|
|
GError *src)
|
|
{
|
|
g_return_if_fail (src != NULL);
|
|
|
|
if (dest == NULL)
|
|
{
|
|
if (src)
|
|
g_error_free (src);
|
|
return;
|
|
}
|
|
else
|
|
{
|
|
if (*dest != NULL)
|
|
g_warning (ERROR_OVERWRITTEN_WARNING, src->message);
|
|
else
|
|
*dest = src;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* g_clear_error:
|
|
* @err: a #GError return location
|
|
*
|
|
* If @err is %NULL, does nothing. If @err is non-%NULL,
|
|
* calls g_error_free() on *@err and sets *@err to %NULL.
|
|
*/
|
|
void
|
|
g_clear_error (GError **err)
|
|
{
|
|
if (err && *err)
|
|
{
|
|
g_error_free (*err);
|
|
*err = NULL;
|
|
}
|
|
}
|
|
|
|
static void
|
|
g_error_add_prefix (gchar **string,
|
|
const gchar *format,
|
|
va_list ap)
|
|
{
|
|
gchar *oldstring;
|
|
gchar *prefix;
|
|
|
|
prefix = g_strdup_vprintf (format, ap);
|
|
oldstring = *string;
|
|
*string = g_strconcat (prefix, oldstring, NULL);
|
|
g_free (oldstring);
|
|
g_free (prefix);
|
|
}
|
|
|
|
/**
|
|
* g_prefix_error:
|
|
* @err: a return location for a #GError, or %NULL
|
|
* @format: printf()-style format string
|
|
* @...: arguments to @format
|
|
*
|
|
* Formats a string according to @format and
|
|
* prefix it to an existing error message. If
|
|
* @err is %NULL (ie: no error variable) then do
|
|
* nothing.
|
|
*
|
|
* If *@err is %NULL (ie: an error variable is
|
|
* present but there is no error condition) then
|
|
* also do nothing. Whether or not it makes
|
|
* sense to take advantage of this feature is up
|
|
* to you.
|
|
*
|
|
* Since: 2.16
|
|
*/
|
|
void
|
|
g_prefix_error (GError **err,
|
|
const gchar *format,
|
|
...)
|
|
{
|
|
if (err && *err)
|
|
{
|
|
va_list ap;
|
|
|
|
va_start (ap, format);
|
|
g_error_add_prefix (&(*err)->message, format, ap);
|
|
va_end (ap);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* g_propagate_prefixed_error:
|
|
* @dest: error return location
|
|
* @src: error to move into the return location
|
|
* @format: printf()-style format string
|
|
* @...: arguments to @format
|
|
*
|
|
* If @dest is %NULL, free @src; otherwise,
|
|
* moves @src into *@dest. *@dest must be %NULL.
|
|
* After the move, add a prefix as with
|
|
* g_prefix_error().
|
|
*
|
|
* Since: 2.16
|
|
**/
|
|
void
|
|
g_propagate_prefixed_error (GError **dest,
|
|
GError *src,
|
|
const gchar *format,
|
|
...)
|
|
{
|
|
g_propagate_error (dest, src);
|
|
|
|
if (dest && *dest)
|
|
{
|
|
va_list ap;
|
|
|
|
va_start (ap, format);
|
|
g_error_add_prefix (&(*dest)->message, format, ap);
|
|
va_end (ap);
|
|
}
|
|
}
|