From 845a932af74ecbd2a20af5751dd61fa8cf2246f5 Mon Sep 17 00:00:00 2001
From: Rafael Espindola <rafael.espindola@gmail.com>
Date: Thu, 11 Apr 2013 14:06:34 +0000
Subject: Add a function to check if an argument list is too long.

This will be used in clang to decide if it should create an @file or not. It
will be tested on the clang side.

Patch by Nathan Froyd.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179285 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Support/Unix/Program.inc | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

(limited to 'lib/Support/Unix/Program.inc')

diff --git a/lib/Support/Unix/Program.inc b/lib/Support/Unix/Program.inc
index 117151c..aa03d48 100644
--- a/lib/Support/Unix/Program.inc
+++ b/lib/Support/Unix/Program.inc
@@ -32,6 +32,9 @@
 #if HAVE_FCNTL_H
 #include <fcntl.h>
 #endif
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
 #ifdef HAVE_POSIX_SPAWN
 #include <spawn.h>
 #if !defined(__APPLE__)
@@ -409,4 +412,25 @@ error_code Program::ChangeStderrToBinary(){
   return make_error_code(errc::success);
 }
 
+bool llvm::sys::argumentsFitWithinSystemLimits(ArrayRef<const char*> Args) {
+  static long ArgMax = sysconf(_SC_ARG_MAX);
+
+  // System says no practical limit.
+  if (ArgMax == -1)
+    return true;
+
+  // Conservatively account for space required by environment variables.
+  ArgMax /= 2;
+
+  size_t ArgLength = 0;
+  for (ArrayRef<const char*>::iterator I = Args.begin(), E = Args.end();
+       I != E; ++I) {
+    ArgLength += strlen(*I) + 1;
+    if (ArgLength > size_t(ArgMax)) {
+      return false;
+    }
+  }
+  return true;
+}
+
 }
-- 
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