* _O_BINARY flag is needed to prevent _write and _read to interpret

  CTRL+Z and end of file.

Author: coderarjob

headers/fcntl.h

@@ -23,7 +23,12 @@
     #define O_CREAT  _O_CREAT
     #define O_WRONLY _O_WRONLY
 #else
-	#include <fcntl.h>  // open
+	#include <fcntl.h>      // open
+
+    // In linux _O_BINARY is not used.  In Windows, this is needed to prevent
+    // _write, _read to interpret CTRL+Z as EOL.
+    // https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/write?view=msvc-160
+    #define _O_BINARY 0     
 #endif
 
 #endif

tea.c

@@ -72,15 +72,15 @@ bool encrypt_decrypt(int mode, char *key, int flags,
     }
 
     // 2. Open the files
-    if ((inf = open (in_file, O_RDONLY)) == -1) {
+    if ((inf = open (in_file, O_RDONLY|_O_BINARY)) == -1) {
         perror("open - input");
         return false;
     }
 
     // Feature output to stdout
     if ( outf == 0 ) {
         if ((outf = open (out_file, 
-                        O_CREAT|O_WRONLY,
+                        O_CREAT|O_WRONLY|_O_BINARY,
                         DEFAULT_FILE_CREATION_MODE)) == -1) {
             perror("open - output");
             close(inf);
@@ -95,15 +95,16 @@ bool encrypt_decrypt(int mode, char *key, int flags,
         memset(&d[len], 0, DATA_SIZE - len);    
 
         // Performs Encryption / Decryption operation
-        printf("%.*s\n%.*s\n",DATA_SIZE,d,KEY_SIZE,key);
         if (mode == ENCRYPT)
             code ((uint32_t *) d, (uint32_t *) key);
         else
             decode ((uint32_t *) d, (uint32_t *) key);
 
         // Write back
-        if ((len = write (outf,d,DATA_SIZE)) < 0)
+        if ((len = write (outf,d,DATA_SIZE)) < 0){
+            perror("write");
             break;
+        }
     }
 
     // If write/read fails.