From c3237b9411d40c1b85c9e2d54982b7f1a7b597f9 Mon Sep 17 00:00:00 2001
From: Rui Ueyama <rui314@gmail.com>
Date: Tue, 21 May 2013 11:27:59 -0700
Subject: Add error check for -j flag.

---
 src/ninja.cc | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/ninja.cc b/src/ninja.cc
index b4797ed..947e352 100644
--- a/src/ninja.cc
+++ b/src/ninja.cc
@@ -807,9 +807,14 @@ int NinjaMain(int argc, char** argv) {
       case 'f':
         input_file = optarg;
         break;
-      case 'j':
-        config.parallelism = atoi(optarg);
+      case 'j': {
+        char* end;
+        int value = strtol(optarg, &end, 10);
+        if (*end != 0 || value <= 0)
+          Fatal("invalid -j parameter");
+        config.parallelism = value;
         break;
+      }
       case 'k': {
         char* end;
         int value = strtol(optarg, &end, 10);
-- 
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