Commit | Line | Data |
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e745ede7 DL |
1 | /* This file implements the emacs_insque and emacs_remque functions, |
2 | copies of the insque and remque functions of BSD. They and all | |
3 | their callers have been renamed to emacs_mumble to allow us to | |
4 | include this file in the menu library on all systems. */ | |
5 | ||
6 | ||
7 | struct qelem { | |
8 | struct qelem *q_forw; | |
9 | struct qelem *q_back; | |
10 | char q_data[1]; | |
11 | }; | |
12 | ||
13 | /* Insert ELEM into a doubly-linked list, after PREV. */ | |
14 | ||
15 | void | |
16 | emacs_insque (elem, prev) | |
17 | struct qelem *elem, *prev; | |
18 | { | |
19 | struct qelem *next = prev->q_forw; | |
20 | prev->q_forw = elem; | |
21 | if (next) | |
22 | next->q_back = elem; | |
23 | elem->q_forw = next; | |
24 | elem->q_back = prev; | |
25 | } | |
26 | ||
27 | /* Unlink ELEM from the doubly-linked list that it is in. */ | |
28 | ||
29 | emacs_remque (elem) | |
30 | struct qelem *elem; | |
31 | { | |
32 | struct qelem *next = elem->q_forw; | |
33 | struct qelem *prev = elem->q_back; | |
34 | if (next) | |
35 | next->q_back = prev; | |
36 | if (prev) | |
37 | prev->q_forw = next; | |
38 | } |