From 909c300c77fa1bb4d48c8fee607c7b83ef62cfcd Mon Sep 17 00:00:00 2001
From: Norayr Chilingarian <norayr@arnet.am>
Date: Thu, 7 May 2020 23:33:11 +0400
Subject: [PATCH] FsHelper checks if file/dir/symlink etc exists

---
 src/vpkFsHelper.Mod         | 81 ++++++++++++++++++++++++++++++++++++-
 unit_tests/makefile         |  9 +++++
 unit_tests/testFsHelper.Mod | 25 ++++++++++++
 3 files changed, 114 insertions(+), 1 deletion(-)
 create mode 100644 unit_tests/makefile
 create mode 100644 unit_tests/testFsHelper.Mod

diff --git a/src/vpkFsHelper.Mod b/src/vpkFsHelper.Mod
index 402f821..843ceb4 100644
--- a/src/vpkFsHelper.Mod
+++ b/src/vpkFsHelper.Mod
@@ -1,10 +1,39 @@
 MODULE vpkFsHelper;
 IMPORT SYSTEM;
 
+CONST
+  dir* = 0; char* = 1; block* = 2; file* = 3; fifo* = 4;
+  symlink* = 5; socket* = 6;
+
+TYPE
+  fileInfo* = RECORD;
+     name* : ARRAY 64 OF CHAR;
+     attr- : SET
+     END;
+
+  Status = RECORD (* struct stat *)
+    dev* : HUGEINT; (* dev_t 8 *)
+    ino* : HUGEINT; (* ino 8 *)
+    nlink* : HUGEINT;
+    mode* : LONGINT;
+    uid*, gid*: LONGINT;
+    pad0* : LONGINT;
+    rdev* : HUGEINT;
+    size* : HUGEINT;
+    blksize* : HUGEINT;
+    blocks* : HUGEINT;
+    atime* : HUGEINT;
+    atimences* : HUGEINT;
+    mtime* : HUGEINT;
+    mtimensec* : HUGEINT;
+    ctime* : HUGEINT;
+    ctimensec* : HUGEINT;
+    unused0*, unused1*, unused2*: HUGEINT;
+    END;
+
 PROCEDURE -Aincludesysstat '#include <sys/stat.h>';
 PROCEDURE -Aincludesystypes '#include <sys/types.h>';
 
-
 PROCEDURE -mkdir(VAR path: ARRAY OF CHAR): INTEGER
   "(int)mkdir(path, 0755)";
 
@@ -15,6 +44,56 @@ BEGIN
    IF res = 0 THEN RETURN TRUE ELSE RETURN FALSE END
 END mkDir;
 
+PROCEDURE -stat(VAR path : ARRAY OF CHAR; st: Status): INTEGER
+"stat((const char*)path, (struct stat*)&st)";
+
+PROCEDURE -isDir(mode: LONGINT): INTEGER
+"S_ISDIR(mode)";
+
+PROCEDURE -isChar(mode: LONGINT): INTEGER
+"S_ISCHR(mode)";
+
+PROCEDURE -isBlock(mode: LONGINT): INTEGER
+"S_ISBLK(mode)";
+
+PROCEDURE -isReg(mode: LONGINT): INTEGER
+"S_ISREG(mode)";
+
+PROCEDURE -isFIFO(mode: LONGINT): INTEGER
+"S_ISFIFO(mode)";
+
+PROCEDURE -isLnk(mode: LONGINT): INTEGER
+"S_ISLNK(mode)";
+
+PROCEDURE -isSock(mode: LONGINT): INTEGER
+"S_ISSOCK(mode)";
+
+PROCEDURE Exists*(VAR fl : fileInfo): BOOLEAN;
+VAR
+  i : INTEGER;
+  st: Status;
+BEGIN
+  fl.attr := {};
+  i := stat(fl.name, st);
+  IF i < 0 THEN RETURN FALSE  END;
+  IF i = 0 THEN (* file exists*) 
+    i := isDir(st.mode);
+    IF i # 0 THEN fl.attr := fl.attr + {dir} END;
+    i := isChar(st.mode);
+    IF i # 0 THEN fl.attr := fl.attr + {char} END;
+    i := isBlock(st.mode);
+    IF i # 0 THEN fl.attr := fl.attr + {block} END;
+    i := isReg(st.mode);
+    IF i # 0 THEN fl.attr := fl.attr + {file} END;
+    i := isFIFO(st.mode);
+    IF i # 0 THEN fl.attr := fl.attr + {fifo} END;
+    i := isLnk(st.mode);
+    IF i # 0 THEN fl.attr := fl.attr + {symlink} END;
+    i := isSock(st.mode);
+    IF i # 0 THEN fl.attr := fl.attr + {socket} END;
+    RETURN TRUE
+  END;
+END Exists;
 
 
 END vpkFsHelper.
diff --git a/unit_tests/makefile b/unit_tests/makefile
new file mode 100644
index 0000000..4b3b456
--- /dev/null
+++ b/unit_tests/makefile
@@ -0,0 +1,9 @@
+BLD = build
+VOC = /opt/voc/bin/voc
+
+all:
+		mkdir -p $(BLD)
+		cd $(BLD) && $(VOC) -s ../../src/vpkFsHelper.Mod ../testFsHelper.Mod -m
+
+clean:
+		rm -rf $(BLD)
diff --git a/unit_tests/testFsHelper.Mod b/unit_tests/testFsHelper.Mod
new file mode 100644
index 0000000..505a3c8
--- /dev/null
+++ b/unit_tests/testFsHelper.Mod
@@ -0,0 +1,25 @@
+MODULE testFsHelper;
+IMPORT Out, vpkFsHelper;
+
+VAR
+  dir : ARRAY 64 OF CHAR;
+  f : vpkFsHelper.fileInfo;
+  b : BOOLEAN;
+BEGIN
+  dir := "/home";
+  f.name := "/home";
+
+  IF vpkFsHelper.Exists(f) THEN
+    Out.String("exists"); Out.Ln;
+    IF vpkFsHelper.dir IN f.attr THEN Out.String("directory"); Out.Ln; END;
+    IF vpkFsHelper.char IN f.attr THEN Out.String("char"); Out.Ln; END;
+    IF vpkFsHelper.block IN f.attr THEN Out.String("block"); Out.Ln; END;
+    IF vpkFsHelper.file IN f.attr THEN Out.String("file"); Out.Ln; END;
+    IF vpkFsHelper.fifo IN f.attr THEN Out.String("fifo"); Out.Ln; END;
+    IF vpkFsHelper.symlink IN f.attr THEN Out.String("symlink"); Out.Ln; END;
+    IF vpkFsHelper.socket IN f.attr THEN Out.String("socket"); Out.Ln; END;
+  ELSE
+    Out.String("does not exist"); Out.Ln;
+  END;
+
+END testFsHelper.