CodeByte: OpenBSD Linked Lists

If you are ever doing systems programming on OpenBSD, there are a number of linked list macros pre-defined, which you may find useful. See the manual page for QUEUE(3).

Here is a quick example I knocked up:

#include <stdio.h>
#include <sys/queue.h>
#include <stdlib.h>
#include <string.h>

#define SWM_MAX_ALT_WM_NAME 32

struct alt_wm {
 SLIST_ENTRY(alt_wm) entries;
 char wm[SWM_MAX_ALT_WM_NAME];
};

int
main(void)
{
 struct alt_wm *n1, *n2, *n3, *node;

 SLIST_HEAD(head, alt_wm) alt_wms_head;
 SLIST_INIT(&alt_wms_head);

 n1 = malloc(sizeof(struct alt_wm));
 strlcpy(n1->wm, "cwm", SWM_MAX_ALT_WM_NAME);

 n2 = malloc(sizeof(struct alt_wm));
 strlcpy(n2->wm, "fvwm", SWM_MAX_ALT_WM_NAME);

 n3 = malloc(sizeof(struct alt_wm));
 strlcpy(n3->wm, "cde", SWM_MAX_ALT_WM_NAME); /* oldskool */

 SLIST_INSERT_HEAD(&alt_wms_head, n1, entries);
 SLIST_INSERT_HEAD(&alt_wms_head, n2, entries);
 SLIST_INSERT_HEAD(&alt_wms_head, n3, entries);

 SLIST_FOREACH(node, &alt_wms_head, entries) {
  printf("%s\n", node->wm);
 }

 return(0);
}