From f46e1f207164090050c1b991705dbbf0d1daa04f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fr=C3=A9d=C3=A9ric=20Mangano?= <fmang@mg0.fr>
Date: Tue, 1 Jan 2013 17:57:55 +0100
Subject: [PATCH] read from stdin, write to stdout

---
 opustags.c | 26 +++++++++++++++++---------
 1 file changed, 17 insertions(+), 9 deletions(-)

diff --git a/opustags.c b/opustags.c
index 13cd1ff..2d74e7d 100644
--- a/opustags.c
+++ b/opustags.c
@@ -194,19 +194,27 @@ int main(int argc, char **argv){
     path_in = argv[optind];
     FILE *out = NULL;
     if(path_out != NULL){
-        if(!overwrite){
-            if(access(path_out, F_OK) == 0){
-                fprintf(stderr, "'%s' already exists (use -y to overwrite)\n", path_out);
+        if(strcmp(path_out, "-") == 0)
+            out = stdout;
+        else{
+            if(!overwrite){
+                if(access(path_out, F_OK) == 0){
+                    fprintf(stderr, "'%s' already exists (use -y to overwrite)\n", path_out);
+                    return EXIT_FAILURE;
+                }
+            }
+            out = fopen(path_out, "w");
+            if(!out){
+                perror("fopen");
                 return EXIT_FAILURE;
             }
         }
-        out = fopen(path_out, "w");
-        if(!out){
-            perror("fopen");
-            return EXIT_FAILURE;
-        }
     }
-    FILE *in = fopen(path_in, "r");
+    FILE *in;
+    if(strcmp(path_in, "-") == 0)
+        in = stdin;
+    else
+        in = fopen(path_in, "r");
     if(!in){
         perror("fopen");
         if(out)