[lit] Make builtin cat work with stdin

cat with no files passed to it is supposed to read from STDIN according
to POSIX. The builtin cat lacking this behavior led to the clang test in
dev-fd-fs.c to fail because it expected this behavior. This is a simple
modification and I do not think it is possible to rewrite the test
without this easily while preserving the semantics around named pipes.

Pull Request: llvm#158447

Author: boomanaiden154

clang/test/Misc/dev-fd-fs.c

@@ -1,6 +1,5 @@
 // Check that we can operate on files from /dev/fd.
 // REQUIRES: dev-fd-fs
-// REQUIRES: shell
 
 // Check reading from named pipes. We cat the input here instead of redirecting
 // it to ensure that /dev/fd/0 is a named pipe, not just a redirected file.

llvm/utils/lit/lit/builtin_commands/cat.py

@@ -49,6 +49,9 @@ def main(argv):
             import os, msvcrt
 
             msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
+    if len(filenames) == 0:
+        sys.stdout.write(sys.stdin.read())
+        sys.exit(0)
     for filename in filenames:
         try:
             contents = None

llvm/utils/lit/tests/Inputs/shtest-cat/cat.txt

@@ -70,3 +70,7 @@
 # NP-CAT-OUTPUT-NEXT:M-HM-IM-JM-KM-LM-MM-NM-OM-PM-QM-RM-SM-TM-UM-VM-WM-XM-YM-ZM-[
 # NP-CAT-OUTPUT-NEXT:M-\M-]M-^M-_M-`M-aM-bM-cM-dM-eM-fM-gM-hM-iM-jM-kM-lM-mM-nM-o
 # NP-CAT-OUTPUT-NEXT:M-pM-qM-rM-sM-tM-uM-vM-wM-xM-yM-zM-{M-|M-}M-~M-^?
+
+## Test that cat will pipe stdin to stdout if no other files are specified.
+# RUN: echo test | cat | FileCheck --check-prefix=CAT-STDIN %s
+# CAT-STDIN: test