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Consider the GLogField.length of "MESSAGE"/"GLIB_DOMAIN" fields in g_log_writer_format_fields()

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Previously it was wrongly assuming that a NUL-termianted string is
passed and the whole string should be written out.

Also document this bug in the documentation of g_log_structured() to
avoid surprises when using older GLib versions.
This commit is contained in:
Sebastian Dröge 2022-09-22 15:09:56 +03:00
parent 87b4771d1f
commit cfdcdaacc1
1 changed files with 18 additions and 4 deletions
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18
glib/gmessages.c
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@ -1642,6 +1642,12 @@ done_query:
* the code which sets them. For example, custom keys from GLib all have a
* `GLIB_` prefix.
*
* Note that keys that expect UTF-8 strings (specifically `"MESSAGE"` and
* `"GLIB_DOMAIN"`) must be passed as NUL-terminated UTF-8 strings until GLib
* version 2.76 because the default log handler did not consider the length of
* the `GLogField`. Starting with GLib 2.76 this is fixed and
* non-NUL-terminated UTF-8 strings can be passed with their correct length.
*
* The @log_domain will be converted into a `GLIB_DOMAIN` field. @log_level will
* be converted into a
* [`PRIORITY`](https://www.freedesktop.org/software/systemd/man/systemd.journal-fields.html#PRIORITY=)
@ -2268,6 +2274,8 @@ g_log_writer_format_fields (GLogLevelFlags log_level,
gsize i;
const gchar *message = NULL;
const gchar *log_domain = NULL;
gssize message_length = -1;
gssize log_domain_length = -1;
gchar level_prefix[STRING_BUFFER_SIZE];
GString *gstring;
gint64 now;
@ -2281,9 +2289,15 @@ g_log_writer_format_fields (GLogLevelFlags log_level,
const GLogField *field = &fields[i];
if (g_strcmp0 (field->key, "MESSAGE") == 0)
{
message = field->value;
message_length = field->length;
}
else if (g_strcmp0 (field->key, "GLIB_DOMAIN") == 0)
{
log_domain = field->value;
log_domain_length = field->length;
}
}
/* Format things. */
@ -2309,7 +2323,7 @@ g_log_writer_format_fields (GLogLevelFlags log_level,
if (log_domain != NULL)
{
g_string_append (gstring, log_domain);
g_string_append_len (gstring, log_domain, log_domain_length);
g_string_append_c (gstring, '-');
}
g_string_append (gstring, level_prefix);
@ -2339,7 +2353,7 @@ g_log_writer_format_fields (GLogLevelFlags log_level,
GString *msg;
const gchar *charset;
msg = g_string_new (message);
msg = g_string_new_len (message, message_length);
escape_string (msg);
if (g_get_console_charset (&charset))