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shared: add nm_cmp_int2ptr_p_with_data() helper

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A cmp() implementation, for sorting an array with pointers, where each
pointer is an inteter according to GPOINTER_TO_INT().

That cames for example handy, if you have a GHashTable with keys
GINT_TO_POINTER(). Then you get the list of keys via
g_hash_table_get_keys_as_array() and want to sort them.
This commit is contained in:
Thomas Haller 2018-01-08 14:40:16 +01:00
parent 2aad517b0b
commit 901aa0315b
1 changed files with 19 additions and 0 deletions
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19
shared/nm-utils/nm-macros-internal.h
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@ -1049,6 +1049,25 @@ nm_cmp_uint32_p_with_data (gconstpointer p_a, gconstpointer p_b, gpointer user_d
return 0;
}
static inline int
nm_cmp_int2ptr_p_with_data (gconstpointer p_a, gconstpointer p_b, gpointer user_data)
{
/* p_a and p_b are two pointers to a pointer, where the pointer is
* interpreted as a integer using GPOINTER_TO_INT().
*
* That is the case of a hash-table that uses GINT_TO_POINTER() to
* convert integers as pointers, and the resulting keys-as-array
* array. */
const int a = GPOINTER_TO_INT (*((gconstpointer *) p_a));
const int b = GPOINTER_TO_INT (*((gconstpointer *) p_b));
if (a < b)
return -1;
if (a > b)
return 1;
return 0;
}
/*****************************************************************************/
/* Taken from systemd's UNIQ_T and UNIQ macros. */