find: implement -prune. "make clean" now works! :)

1 files changed, 21 insertions, 3 deletions

diff --git a/findutils/find.c b/findutils/find.c
index 21ea9d422..bc285d36a 100644
--- a/findutils/find.c
+++ b/findutils/find.c
@@ -69,6 +69,7 @@ USE_FEATURE_FIND_NEWER( SACT(newer, time_t newer_mtime;))
 USE_FEATURE_FIND_INUM(  SACT(inum,  ino_t inode_num;))
 USE_FEATURE_FIND_EXEC(  SACT(exec,  char **exec_argv; int *subst_count; int exec_argc;))
 USE_DESKTOP(            SACT(paren, action ***subexpr;))
+USE_DESKTOP(            SACT(prune))
 
 static action ***actions;
 static int need_print = 1;
@@ -224,11 +225,22 @@ SFUNC(paren)
 {
         return exec_actions(ap->subexpr, fileName, statbuf);
 }
+/*
+ * -prune: if -depth is not given, return true and do not descend
+ * current dir; if -depth is given, return false with no effect.
+ * Example:
+ * find dir -name 'asm-*' -prune -o -name '*.[chS]' -print
+ */
+SFUNC(prune)
+{
+        return SKIP;
+}
 #endif
 
 
 static int fileAction(const char *fileName, struct stat *statbuf, void* junk, int depth)
 {
+        int rc;
 #ifdef CONFIG_FEATURE_FIND_XDEV
         if (S_ISDIR(statbuf->st_mode) && xdev_count) {
                 int i;
@@ -238,10 +250,13 @@ static int fileAction(const char *fileName, struct stat *statbuf, void* junk, in
                 }
         }
 #endif
-        /* had no explicit -print[0] or -exec? then print */
-        if (exec_actions(actions, fileName, statbuf) && need_print)
+        rc = exec_actions(actions, fileName, statbuf);
+        /* Had no explicit -print[0] or -exec? then print */
+        if (rc && need_print)
                 puts(fileName);
-        return TRUE;
+        /* Cannot return 0: our caller, recursive_action(),
+         * will perror() and skip dirs (if called on dir) */
+        return rc == 0 ? TRUE : rc;
 }
 
 
@@ -469,6 +484,9 @@ action*** parse_params(char **argv)
                         *endarg = ")"; /* restore NULLed parameter */
                         argv = endarg;
                 }
+                else if (strcmp(arg, "-prune") == 0) {
+                        (void) ALLOC_ACTION(prune);
+                }
 #endif
                 else
                         bb_show_usage();