From fad38c7d1675a34a350fb1d99fb6b66728cad8a7 Mon Sep 17 00:00:00 2001
From: Rob Landley <rob@landley.net>
Date: Tue, 11 Mar 2014 17:50:17 -0500
Subject: Factor out mkpathat.

---
 toys/posix/mkdir.c | 47 ++++++++++++++++++++++++++++++-----------------
 1 file changed, 30 insertions(+), 17 deletions(-)

(limited to 'toys/posix/mkdir.c')

diff --git a/toys/posix/mkdir.c b/toys/posix/mkdir.c
index 00946389..25dfb0de 100644
--- a/toys/posix/mkdir.c
+++ b/toys/posix/mkdir.c
@@ -23,42 +23,49 @@ config MKDIR
 
 GLOBALS(
   char *arg_mode;
-
-  mode_t mode;
 )
 
-static int do_mkdir(char *dir)
+// flags: 1=make last dir (with mode lastmode, otherwise skips last component)
+//        2=make path (already exists is ok)
+//        4=verbose
+// returns 0 = path ok, 1 = error
+int mkpathat(int atfd, char *dir, mode_t lastmode, int flags)
 {
   struct stat buf;
   char *s;
 
   // mkdir -p one/two/three is not an error if the path already exists,
-  // but is if "three" is a file.  The others we dereference and catch
+  // but is if "three" is a file. The others we dereference and catch
   // not-a-directory along the way, but the last one we must explicitly
   // test for. Might as well do it up front.
 
-  if (!stat(dir, &buf) && !S_ISDIR(buf.st_mode)) {
+  if (!fstatat(atfd, dir, &buf, 0) && !S_ISDIR(buf.st_mode)) {
     errno = EEXIST;
     return 1;
   }
 
-  for (s=dir; ; s++) {
-    char save=0;
-    mode_t mode = 0777&~toys.old_umask;
+  // Skip leading / of absolute paths
+  while (*dir == '/') dir++;
+
+  for (s=dir; ;s++) {
+    char save = 0;
+    mode_t mode = (0777&~toys.old_umask)|0300;
 
     // Skip leading / of absolute paths.
-    if (s!=dir && *s == '/' && (toys.optflags&FLAG_p)) {
+    if (*s == '/' && (flags&2)) {
       save = *s;
       *s = 0;
     } else if (*s) continue;
 
     // Use the mode from the -m option only for the last directory.
-    if (save == '/') mode |= 0300;
-    else if (toys.optflags&FLAG_m) mode = TT.mode;
-
-    if (mkdir(dir, mode)) {
-      if (!(toys.optflags&FLAG_p) || errno != EEXIST) return 1;
-    } else if (toys.optflags&FLAG_v)
+    if (!save) {
+      if (flags&1) mode = lastmode;
+      else break;
+    }
+
+    if (mkdirat(atfd, dir, mode)) {
+      if (!(flags&2) || errno != EEXIST) return 1;
+    } else if (flags&4)
       fprintf(stderr, "%s: created directory '%s'\n", toys.which->name, dir);
     
     if (!(*s = save)) break;
@@ -70,8 +77,14 @@ static int do_mkdir(char *dir)
 void mkdir_main(void)
 {
   char **s;
+  mode_t mode = (0777&~toys.old_umask);
+
+
+  if (TT.arg_mode) mode = string_to_mode(TT.arg_mode, 0777);
 
-  if(toys.optflags&FLAG_m) TT.mode = string_to_mode(TT.arg_mode, 0777);
+  // Note, -p and -v flags line up with mkpathat() flags
 
-  for (s=toys.optargs; *s; s++) if (do_mkdir(*s)) perror_msg("'%s'", *s);
+  for (s=toys.optargs; *s; s++)
+    if (mkpathat(AT_FDCWD, *s, mode, toys.optflags|1))
+      perror_msg("'%s'", *s);
 }
-- 
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