Infrastructure, first drop of toy shell, and a bit of work on df.
diff --git a/lib/getmountlist.c b/lib/getmountlist.c
new file mode 100644
index 0000000..a2b0698
--- /dev/null
+++ b/lib/getmountlist.c
@@ -0,0 +1,39 @@
+/* vi: set ts=4 : */
+
+#include "toys.h"
+
+#include <mntent.h>
+
+char *path_mounts = "/proc/mounts";
+
+// Get a list of mount points from /etc/mtab or /proc/mounts. This returns
+// a reversed list, which is good for finding overmounts and such.
+
+struct mtab_list *getmountlist(int die)
+{
+ FILE *fp;
+ struct mtab_list *mtlist, *mt;
+ struct mntent me;
+ char evilbuf[2*PATH_MAX];
+
+ mtlist = 0;
+ if (!(fp = setmntent(path_mounts, "r"))) {
+ if (die) error_exit("cannot open %s", path_mounts);
+ } else {
+ while (getmntent_r(fp, &me, evilbuf, sizeof(evilbuf))) {
+ char *str;
+
+ mt = xmalloc(sizeof(struct mtab_list) + strlen(me.mnt_fsname) +
+ strlen(me.mnt_dir) + strlen(me.mnt_type) + 3);
+ mt->next = mtlist;
+ strcpy(mt->type, me.mnt_type);
+ mt->dir = mt->type + strlen(mt->type) + 1;
+ strcpy(mt->dir, me.mnt_dir);
+ mt->device = mt->dir + strlen(mt->dir) + 1;
+ mt->device = ++str;
+ strcpy(str, me.mnt_fsname);
+ mtlist = mt;
+ }
+ }
+ return mtlist;
+}