Revert "Option parsing: support case-insensitive option matching." as it broke Windows buildbot.

This reverts r189416.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189424 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 16 insertions, 14 deletions

diff --git a/utils/TableGen/OptParserEmitter.cpp b/utils/TableGen/OptParserEmitter.cpp
index f2694361db..86328bf18f 100644
--- a/utils/TableGen/OptParserEmitter.cpp
+++ b/utils/TableGen/OptParserEmitter.cpp
@@ -13,25 +13,27 @@
 #include "llvm/ADT/Twine.h"
 #include "llvm/TableGen/Record.h"
 #include "llvm/TableGen/TableGenBackend.h"
-#include <cstring>
 #include <map>
-#include <strings.h>
 
 using namespace llvm;
 
-// Ordering on Info. The logic should match with the consumer-side function in
-// llvm/Option/OptTable.h.
 static int StrCmpOptionName(const char *A, const char *B) {
-  size_t I = strlen(A);
-  size_t J = strlen(B);
-  if (I == J) {
-    if (int N = strcasecmp(A, B))
-      return N;
-    return strcmp(A, B);
+  char a = *A, b = *B;
+  while (a == b) {
+    if (a == '\0')
+      return 0;
+
+    a = *++A;
+    b = *++B;
   }
-  if (I < J)
-    return strncasecmp(A, B, I) < 0 ? -1 : 1;
-  return strncasecmp(A, B, J) <= 0 ? -1 : 1;
+
+  if (a == '\0') // A is a prefix of B.
+    return 1;
+  if (b == '\0') // B is a prefix of A.
+    return -1;
+
+  // Otherwise lexicographic.
+  return (a < b) ? -1 : 1;
 }
 
 static int CompareOptionRecords(const void *Av, const void *Bv) {
@@ -48,7 +50,7 @@ static int CompareOptionRecords(const void *Av, const void *Bv) {
   if (!ASent)
     if (int Cmp = StrCmpOptionName(A->getValueAsString("Name").c_str(),
                                    B->getValueAsString("Name").c_str()))
-      return Cmp;
+    return Cmp;
 
   if (!ASent) {
     std::vector<std::string> APrefixes = A->getValueAsListOfStrings("Prefixes");