1 files changed, 42 insertions, 2 deletions
diff --git a/common_decode.cc b/common_decode.cc
index 6b108c1..6ff3086 100644
--- a/common_decode.cc
+++ b/common_decode.cc
@@ -1,5 +1,5 @@
 /* Tarlz - Archiver with multimember lzip compression
-   Copyright (C) 2013-2020 Antonio Diaz Diaz.
+   Copyright (C) 2013-2021 Antonio Diaz Diaz.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -17,6 +17,7 @@
 
 #define _FILE_OFFSET_BITS 64
 
+#include <cerrno>
 #include <climits>
 #include <cstdio>
 #include <cstdlib>
@@ -24,7 +25,7 @@
 #include <ctime>
 #include <string>
 #include <vector>
-#include <pthread.h>
+#include <pthread.h>	// for tarlz.h
 #include <stdint.h>
 #include <sys/stat.h>
 
@@ -198,3 +199,42 @@ bool check_skip_filename( const Cl_options & cl_opts,
         }
   return skip;
   }
+
+
+mode_t get_umask()
+  {
+  static mode_t mask = 0;		// read once, cache the result
+  static bool first_call = true;
+  if( first_call ) { first_call = false; mask = umask( 0 ); umask( mask );
+                     mask &= S_IRWXU | S_IRWXG | S_IRWXO; }
+  return mask;
+  }
+
+
+bool make_path( const std::string & name )
+  {
+  const mode_t mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
+  unsigned end = name.size();	// first slash before last component
+
+  while( end > 0 && name[end-1] == '/' ) --end;	// remove trailing slashes
+  while( end > 0 && name[end-1] != '/' ) --end;	// remove last component
+  while( end > 0 && name[end-1] == '/' ) --end;	// remove more slashes
+
+  unsigned index = 0;
+  while( index < end )
+    {
+    while( index < end && name[index] == '/' ) ++index;
+    unsigned first = index;
+    while( index < end && name[index] != '/' ) ++index;
+    if( first < index )
+      {
+      const std::string partial( name, 0, index );
+      struct stat st;
+      if( stat( partial.c_str(), &st ) == 0 )
+        { if( !S_ISDIR( st.st_mode ) ) return false; }
+      else if( mkdir( partial.c_str(), mode ) != 0 && errno != EEXIST )
+        return false;
+      }
+    }
+  return true;
+  }