--- pzip-0.83/main.c.bak	2008-04-06 00:20:43.323480897 +0300
+++ pzip-0.83/main.c	2008-04-06 00:31:48.041480029 +0300
@@ -7,6 +7,9 @@
 
 #include <stdio.h>
 #include <ctype.h>
+#include <errno.h>
+#include <unistd.h>
+
 #include "pzip.h"
 #include "config.h"
 #include "version.h"
@@ -82,6 +85,7 @@ int main(  int argc,   char* argv[] ) {
     int    encode_len;
     int    input_len;
     bool   encode_only = FALSE;
+    bool   fsync_output = FALSE;
     bool   encoding= TRUE;
     FILE*  in_fp    = NULL;
     FILE*  out_fp   = NULL;
@@ -114,6 +118,10 @@ int main(  int argc,   char* argv[] ) {
                 encode_only = TRUE;
                 break;
 
+            case 'f':
+                fsync_output = TRUE;
+                break;
+
             case 'v':
                 ++verbose;
                 break;
@@ -226,11 +234,41 @@ int main(  int argc,   char* argv[] ) {
     }
 
     if (out_fp) {
-        if (encoding) fwrite( encode_buf, 1, encode_len, out_fp );
-        else          fwrite( decode_buf, 1, input_len,    out_fp );
+        size_t fret;
+
+        if (encoding) {
+            fret = fwrite( encode_buf, 1, encode_len, out_fp );
+            if (fret != encode_len) {
+                fprintf(stderr,
+                "***** failed to write output file: %s\n", strerror(errno));
+                exit( 1 );
+           }
+        } else {
+            fret = fwrite( decode_buf, 1, input_len,    out_fp );
+            if (fret != input_len) {
+                fprintf(stderr,
+                "***** failed to write output file: %s\n", strerror(errno));
+                exit( 1 );
+           }
+        }
 
-        fclose( out_fp );
-        out_fp = NULL;
+        if (fflush( out_fp ) == EOF) {
+            fprintf(stderr,
+                "***** failed to write output file: %s\n", strerror(errno));
+            fclose( out_fp );
+            exit( 1 );
+        }
+        if (fsync_output && (fsync( fileno( out_fp ) ) == -1 && (errno != EINVAL))) {
+            fprintf(stderr,
+                "***** failed to fsync output file: %s\n", strerror(errno));
+            fclose( out_fp );
+            exit( 1 );
+        }
+        if (fclose( out_fp ) == EOF) {
+            fprintf(stderr,
+                "***** failed to write output file: %s\n", strerror(errno));
+           exit( 1 );
+        }
     }
 
     exit( 0 );