mirrors/systemd
0
0
Fork 0
mirror of https://github.com/systemd/systemd.git synced 2025-01-02 06:34:07 +08:00
Code Issues Packages Projects Releases Wiki Activity

list: add macro for iterating through a list an item is in, skipping the item

Browse Source
This commit is contained in:
Lennart Poettering 2015-01-28 00:34:58 +01:00
parent 976dec6e7b
commit 7663df3770
2 changed files with 18 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
src/shared/list.h
View File

@ -138,6 +138,16 @@
#define LIST_FOREACH_AFTER(name,i,p) \
for ((i) = (p)->name##_next; (i); (i) = (i)->name##_next)
/* Iterate through all the members of the list p is included in, but skip over p */
#define LIST_FOREACH_OTHERS(name,i,p) \
for (({ \
(i) = (p); \
while ((i) && (i)->name##_prev) \
(i) = (i)->name##_prev; \
}); \
(i); \
(i) = (i)->name##_next == (p) ? (p)->name##_next : (i)->name##_next)
/* Loop starting from p->next until p->prev.
p can be adjusted meanwhile. */
#define LIST_LOOP_BUT_ONE(name,i,head,p) \

9
src/test/test-list.c
View File

@ -38,6 +38,13 @@ int main(int argc, const char *argv[]) {
LIST_PREPEND(item, head, &items[i]);
}
i = 0;
LIST_FOREACH_OTHERS(item, cursor, &items[2]) {
i++;
assert_se(cursor != &items[2]);
}
assert_se(i == ELEMENTSOF(items)-1);
assert_se(!LIST_JUST_US(item, head));
assert_se(items[0].item_next == NULL);
@ -125,7 +132,7 @@ int main(int argc, const char *argv[]) {
assert_se(items[3].item_prev == &items[2]);
for (i = 0; i < ELEMENTSOF(items); i++)
LIST_REMOVE(item, head, &items[i]);
LIST_REMOVE(item, head, &items[i]);
assert_se(head == NULL);