Add xabspath(), is_file_type(), which_in_path(), and find_in_path().
diff --git a/lib/lib.h b/lib/lib.h
index 28888a4..10d33bd 100644
--- a/lib/lib.h
+++ b/lib/lib.h
@@ -15,6 +15,7 @@
void *xzalloc(size_t size);
void xrealloc(void **ptr, size_t size);
void *xstrndup(char *s, size_t n);
+void *xstrdup(char *s);
char *xmsprintf(char *format, ...);
void xexec(char **argv);
int xopen(char *path, int flags, int mode);
@@ -23,7 +24,10 @@
ssize_t readall(int fd, void *buf, size_t count);
void xread(int fd, char *buf, size_t count);
char *xgetcwd(void);
-char *find_in_path(char *path, char *filename);
+char *xabspath(char *path);
+int is_file_type(char *path, int type);
+char *which_in_path(char *filename);
+char *find_in_path(char *path, char *filename, int type);
void utoa_to_buf(unsigned n, char *buf, unsigned buflen);
void itoa_to_buf(int n, char *buf, unsigned buflen);
char *utoa(unsigned n);