Add cp --parents

2 files changed, 25 insertions, 0 deletions

diff --git a/lib/lib.c b/lib/lib.c
index 27d14be7..8c46678f 100644
--- a/lib/lib.c
+++ b/lib/lib.c
@@ -1002,6 +1002,17 @@ void mode_to_string(mode_t mode, char *buf)
   *buf = c;
 }
 
+// dirname() can modify its argument or return a pointer to a constant string
+// This always returns a malloc() copy of everyting before last (run of ) '/'.
+char *getdirname(char *name)
+{
+  char *s = xstrdup(name), *ss = strrchr(s, '/');
+
+  while (*ss && *ss == '/' && s != ss) *ss-- = 0;
+
+  return s;
+}
+
 // basename() can modify its argument or return a pointer to a constant string
 // This just gives after the last '/' or the whole stirng if no /
 char *getbasename(char *name)
@@ -1013,6 +1024,18 @@ char *getbasename(char *name)
   return name;
 }
 
+// Is this file under this directory?
+int fileunderdir(char *file, char *dir)
+{
+  char *s1 = xabspath(dir, 1), *s2 = xabspath(file, -1), *ss = s2;
+  int rc = s1 && s2 && strstart(&ss, s1) && (!s1[1] || s2[strlen(s1)] == '/');
+
+  free(s1);
+  free(s2);
+
+  return rc;
+}
+
 // Execute a callback for each PID that matches a process name from a list.
 void names_to_pid(char **names, int (*callback)(pid_t pid, char *name))
 {
diff --git a/lib/lib.h b/lib/lib.h
index ccf342cc..353e262d 100644
--- a/lib/lib.h
+++ b/lib/lib.h
@@ -337,7 +337,9 @@ char *num_to_sig(int sig);
 
 mode_t string_to_mode(char *mode_str, mode_t base);
 void mode_to_string(mode_t mode, char *buf);
+char *getdirname(char *name);
 char *getbasename(char *name);
+int fileunderdir(char *file, char *dir);
 void names_to_pid(char **names, int (*callback)(pid_t pid, char *name));
 
 pid_t __attribute__((returns_twice)) xvforkwrap(pid_t pid);