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error: make Error **errp const where it is appropriate

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Mostly, Error ** is for returning error from the function, so the
callee sets it. However these three functions get already filled errp
parameter. They don't change the pointer itself, only change the
internal state of referenced Error object. So we can make it
Error *const * errp, to stress the behavior. It will also help
coccinelle script (in future) to distinguish such cases from common
errp usage.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20191205174635.18758-4-vsementsov@virtuozzo.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
[Commit message typo fixed]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2019-12-05 20:46:17 +03:00 committed by Markus Armbruster
parent 33c9642f65
commit 49fbc7236d
2 changed files with 6 additions and 6 deletions
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6
include/qapi/error.h
View File

@ -233,13 +233,13 @@ void error_propagate_prepend(Error **dst_errp, Error *local_err,
* Prepend some text to @errp's human-readable error message.
* The text is made by formatting @fmt, @ap like vprintf().
*/
void error_vprepend(Error **errp, const char *fmt, va_list ap);
void error_vprepend(Error *const *errp, const char *fmt, va_list ap);
/*
* Prepend some text to @errp's human-readable error message.
* The text is made by formatting @fmt, ... like printf().
*/
void error_prepend(Error **errp, const char *fmt, ...)
void error_prepend(Error *const *errp, const char *fmt, ...)
GCC_FMT_ATTR(2, 3);
/*
@ -256,7 +256,7 @@ void error_prepend(Error **errp, const char *fmt, ...)
* May be called multiple times. The resulting hint should end with a
* newline.
*/
void error_append_hint(Error **errp, const char *fmt, ...)
void error_append_hint(Error *const *errp, const char *fmt, ...)
GCC_FMT_ATTR(2, 3);
/*

6
util/error.c
View File

@ -121,7 +121,7 @@ void error_setg_file_open_internal(Error **errp,
"Could not open '%s'", filename);
}
void error_vprepend(Error **errp, const char *fmt, va_list ap)
void error_vprepend(Error *const *errp, const char *fmt, va_list ap)
{
GString *newmsg;
@ -136,7 +136,7 @@ void error_vprepend(Error **errp, const char *fmt, va_list ap)
(*errp)->msg = g_string_free(newmsg, 0);
}
void error_prepend(Error **errp, const char *fmt, ...)
void error_prepend(Error *const *errp, const char *fmt, ...)
{
va_list ap;
@ -145,7 +145,7 @@ void error_prepend(Error **errp, const char *fmt, ...)
va_end(ap);
}
void error_append_hint(Error **errp, const char *fmt, ...)
void error_append_hint(Error *const *errp, const char *fmt, ...)
{
va_list ap;
int saved_errno = errno;