verify -k param is numeric

Fixes issue #85.

2 files changed, 10 insertions, 4 deletions

diff --git a/src/build.cc b/src/build.cc
index e0118ef..9adce8f 100644
--- a/src/build.cc
+++ b/src/build.cc
@@ -439,8 +439,8 @@ bool Builder::Build(string* err) {
         --pending_commands;
         FinishEdge(edge, success, output);
         if (!success) {
-          if (--failures_allowed < 0) {
-            if (config_.swallow_failures > 0)
+          if (failures_allowed-- == 0) {
+            if (config_.swallow_failures != 0)
               *err = "subcommands failed";
             else
               *err = "subcommand failed";
diff --git a/src/ninja.cc b/src/ninja.cc
index fbee6d9..ae9c534 100644
--- a/src/ninja.cc
+++ b/src/ninja.cc
@@ -383,11 +383,17 @@ int main(int argc, char** argv) {
       case 'j':
         config.parallelism = atoi(optarg);
         break;
-      case 'k':
+      case 'k': {
+        char* end;
+        int value = strtol(optarg, &end, 10);
+        if (*end != 0)
+          Fatal("-k parameter not numeric; did you mean -k0?");
+
         // We want to go until N jobs fail, which means we should ignore
         // the first N-1 that fail and then stop.
-        config.swallow_failures = atoi(optarg) - 1;
+        config.swallow_failures = value - 1;
         break;
+      }
       case 'n':
         config.dry_run = true;
         break;