Merge pull request #1179 from supertopher/dev

Improves UX for --list command's lack of support for pipes

programs/fileio.c

@@ -2030,6 +2030,12 @@ static int FIO_listFile(fileInfo_t* total, const char* inFileName, int displayLe
 }
 
 int FIO_listMultipleFiles(unsigned numFiles, const char** filenameTable, int displayLevel){
+
+    if (!IS_CONSOLE(stdin)) {
+        DISPLAYOUT("zstd: --list does not support reading from standard input\n");
+        return 1;
+    }
+
     if (numFiles == 0) {
         DISPLAYOUT("No files given\n");
         return 0;

tests/playTests.sh

@@ -730,6 +730,9 @@ $ECHO "\n===>  zstd --list/-l error detection tests "
 ! $ZSTD -lv tmp1*
 ! $ZSTD --list -v tmp2 tmp12.zst
 
+$ECHO "\n===>  zstd --list/-l exits 1 when stdin is piped in"
+! echo "piped STDIN" | $ZSTD --list
+
 $ECHO "\n===>  zstd --list/-l test with null files "
 ./datagen -g0 > tmp5
 $ZSTD tmp5