1 files changed, 48 insertions, 0 deletions
diff --git a/utils/count/count.c b/utils/count/count.c
new file mode 100644
index 0000000000..a37e1e0b25
--- /dev/null
+++ b/utils/count/count.c
@@ -0,0 +1,48 @@
+/*===- count.c - The 'count' testing tool ---------------------------------===*\
+ *
+ *                     The LLVM Compiler Infrastructure
+ *
+ * This file is distributed under the University of Illinois Open Source
+ * License. See LICENSE.TXT for details.
+ *
+\*===----------------------------------------------------------------------===*/
+
+#include <stdlib.h>
+#include <stdio.h>
+
+int main(int argc, char **argv) {
+  unsigned Count, NumLines, NumRead;
+  char Buffer[4096], *End;
+
+  if (argc != 2) {
+    fprintf(stderr, "usage: %s <expected line count>\n", argv[0]);
+    return 2;
+  }
+
+  Count = strtol(argv[1], &End, 10);
+  if (*End != '\0' && End != argv[1]) {
+    fprintf(stderr, "%s: invalid count argument '%s'\n", argv[0], argv[1]);
+    return 2;
+  }
+
+  NumLines = 0;
+  while ((NumRead = fread(Buffer, 1, sizeof(Buffer), stdin))) {
+    unsigned i;
+
+    for (i = 0; i != NumRead; ++i)
+      if (Buffer[i] == '\n')
+        ++NumLines;
+  }
+    
+  if (!feof(stdin)) {
+    fprintf(stderr, "%s: error reading stdin\n", argv[0]);
+    return 3;
+  }
+
+  if (Count != NumLines) {
+    fprintf(stderr, "Expected %d lines, got %d.\n", Count, NumLines);
+    return 1;
+  }
+
+  return 0;
+}