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glib-aux: add nm_ref_string_reset_str_upcast() helper

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Thomas Haller 2022-01-05 17:02:01 +01:00
parent 39c308f370
commit 28018d6985
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GPG key ID: 29C2366E4DFC5728
1 changed files with 43 additions and 4 deletions
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47
src/libnm-glib-aux/nm-ref-string.h
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@ -164,24 +164,63 @@ nm_ref_string_unref_upcast(const char *str)
nm_ref_string_unref(NM_REF_STRING_UPCAST(str));
}
/**
* nm_ref_string_reset_str_upcast:
* @ptr: the destination pointer that gets updated.
* @str: the new string to be set.
*
* @ptr is a location (destination pointer) of an "upcast" NMRefString.
* That is, it holds either %NULL or some ((NMRefString *) rstr)->str.
* In other words, @ptr holds an NMRefString which you could get via
* NM_REF_STRING_UPCAST(*ptr).
* This function resets @ptr to point to a NMRefString equal to @str.
*
* Returns: %TRUE if the pointer changed and %FALSE if the value was
* already set to a string equal to @str.
*/
static inline gboolean
nm_ref_string_reset_str_upcast(const char **ptr, const char *str)
{
NMRefString *rstr;
gsize l;
nm_assert(ptr);
if (!str)
return nm_clear_pointer(ptr, nm_ref_string_unref_upcast);
rstr = NM_REF_STRING_UPCAST(*ptr);
l = strlen(str);
if (rstr && rstr->len == l && (rstr->str == str || memcmp(rstr->str, str, l) == 0))
return FALSE;
*ptr = nm_ref_string_new_len(str, l)->str;
nm_ref_string_unref(rstr);
return TRUE;
}
static inline gboolean
nm_ref_string_reset_str(NMRefString **ptr, const char *str)
{
nm_auto_ref_string NMRefString *rstr = NULL;
gsize l;
NMRefString *rstr;
gsize l;
nm_assert(ptr);
if (!str)
return nm_clear_pointer(ptr, nm_ref_string_unref);
rstr = *ptr;
l = strlen(str);
if ((*ptr) && (*ptr)->len == l && ((*ptr)->str == str || memcmp((*ptr)->str, str, l) == 0))
if (rstr && rstr->len == l && (rstr->str == str || memcmp(rstr->str, str, l) == 0))
return FALSE;
rstr = *ptr;
*ptr = nm_ref_string_new_len(str, l);
nm_ref_string_unref(rstr);
return TRUE;
}