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glib-aux: create nm_strvarray_get_idxnull_or_greturn macro

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This commit adds a getter macro which checks the bounds of a
StrvArray when getting elements, while allowing access at `len` - returning NULL.

https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/merge_requests/1765
This commit is contained in:
Jan Vaclav 2023-10-16 10:17:58 +02:00 • committed by Beniamino Galvani
parent cd84dae191
commit 1f3779fceb
1 changed files with 14 additions and 0 deletions
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14
src/libnm-glib-aux/nm-shared-utils.h
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@ -3019,6 +3019,20 @@ nm_strvarray_get_idx(GArray *array, guint idx)
return nm_g_array_index(array, const char *, idx);
}
/* nm_strvarray_get_idxnull_or_greturn() permits access at `len`,
* returning NULL. If the access is out of bounds, the assertion
* will fail (and also return NULL). */
#define nm_strvarray_get_idxnull_or_greturn(arr, idx) \
({ \
GArray *_arr = (arr); \
gsize _idx = (idx); \
guint _len = nm_g_array_len(_arr); \
\
g_return_val_if_fail(_idx <= _len, NULL); \
\
_idx == _len ? NULL : nm_strvarray_get_idx(_arr, _idx); \
})
static inline const char *const *
nm_strvarray_get_strv_non_empty(GArray *arr, guint *length)
{