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qdict: Add qdict_{set,copy}_default()

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In the block layer functions that determine options for a child block
device, it's a common pattern to either copy options from the parent's
options or to set a default string if the option isn't explicitly set
yet for the child. Provide convenience functions so that it becomes a
one-liner for each option.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Kevin Wolf 2015-01-19 21:22:45 +01:00
parent bd50530a9f
commit 7990d2c99c
2 changed files with 36 additions and 0 deletions
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3
include/qapi/qmp/qdict.h
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@ -65,6 +65,9 @@ int64_t qdict_get_try_int(const QDict *qdict, const char *key,
int qdict_get_try_bool(const QDict *qdict, const char *key, int def_value);
const char *qdict_get_try_str(const QDict *qdict, const char *key);
void qdict_copy_default(QDict *dst, QDict *src, const char *key);
void qdict_set_default_str(QDict *dst, const char *key, const char *val);
QDict *qdict_clone_shallow(const QDict *src);
void qdict_flatten(QDict *qdict);