diff --git a/src/libfileis.c b/src/libfileis.c
new file mode 100644
index 0000000..51caa88
--- /dev/null
+++ b/src/libfileis.c
@@ -0,0 +1,27 @@
+#include <stddef.h> /* NULL */
+#include <sys/stat.h> /* lstat(3), stat struct, S_ISBLK, S_ISCHR, S_ISDIR,
+                       * S_ISFIFO, S_ISGID, S_ISREG, S_ISLNK, S_ISSOCK,
+                       * S_ISUID, S_ISVTX */
+static char *ofn = NULL;
+static struct stat s;
+
+int
+fileis_exists(char *fn){
+	if (fn == NULL) { return ofn != NULL; }
+	if (lstat(fn, &s) == -1) { return 0; }
+	ofn = fn; return 1;
+}
+
+int fileis_block(char *fn)  { return fileis_exists(fn) && S_ISBLK(s.st_mode); }
+int fileis_char(char *fn)   { return fileis_exists(fn) && S_ISCHR(s.st_mode); }
+int fileis_dir(char *fn)    { return fileis_exists(fn) && S_ISDIR(s.st_mode); }
+/*  fileis_exec(char *fn)   { return fileis_exists(fn) && } */
+int fileis_fifo(char *fn)   { return fileis_exists(fn) && S_ISFIFO(s.st_mode); }
+int fileis_setgid(char *fn) { return fileis_exists(fn) && (s.st_mode & S_ISGID); }
+int fileis_link(char *fn)   { return fileis_exists(fn) && S_ISLNK(s.st_mode); }
+/*  fileis_read(char *fn)   { return fileis_exists(fn) && } */
+int fileis_regular(char *fn){ return fileis_exists(fn) && S_ISREG(s.st_mode); }
+int fileis_socket(char *fn) { return fileis_exists(fn) && S_ISSOCK(s.st_mode); }
+int fileis_setuid(char *fn) { return fileis_exists(fn) && (s.st_mode & S_ISUID); }
+int fileis_vtx(char *fn)    { return fileis_exists(fn) && (s.st_mode & S_ISVTX); }
+/*  fileis_write(char *fn)  { return fileis_exists(fn) && } */
diff --git a/src/libfileis.h b/src/libfileis.h
new file mode 100644
index 0000000..91426f9
--- /dev/null
+++ b/src/libfileis.h
@@ -0,0 +1,14 @@
+int fileis_block  (char *fn);
+int fileis_char   (char *fn);
+int fileis_dir    (char *fn);
+/*  fileis_exec   (char *fn); */
+int fileis_exists (char *fn);
+int fileis_fifo   (char *fn);
+int fileis_setgid (char *fn);
+int fileis_link   (char *fn);
+/*  fileis_read   (char *fn); */
+int fileis_regular(char *fn);
+int fileis_socket (char *fn);
+int fileis_setuid (char *fn);
+int fileis_vtx    (char *fn);
+/*  fileis_write  (char *fn); */