From 931f16bbdcf82221a29fe404af604b9372dc60c4 Mon Sep 17 00:00:00 2001
From: simonmar <unknown>
Date: Tue, 17 Dec 2002 12:27:30 +0000
Subject: [PATCH] [project @ 2002-12-17 12:27:30 by simonmar] Oops, cmpFS uses
 strcmp() to compare strings, so it has a '\0' terminator
 requirement.  Fix it to use strncmp() instead.

---
 ghc/compiler/utils/FastString.lhs |   19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/ghc/compiler/utils/FastString.lhs b/ghc/compiler/utils/FastString.lhs
index eadbd96..ed81d79 100644
--- a/ghc/compiler/utils/FastString.lhs
+++ b/ghc/compiler/utils/FastString.lhs
@@ -418,20 +418,21 @@ cmpFS (UnicodeStr u1# s1) (UnicodeStr u2# s2) = if u1# ==# u2# then EQ
     else compare s1 s2
 cmpFS (UnicodeStr _ s1) s2 = compare s1 (unpackIntFS s2)
 cmpFS s1 (UnicodeStr _ s2) = compare (unpackIntFS s1) s2
-cmpFS (FastString u1# _ b1#) (FastString u2# _ b2#) = -- assume non-null chars
-  if u1# ==# u2# then
-     EQ
-  else
-   unsafePerformIO (
-    strcmp b1# b2# >>= \ (I# res) ->
+cmpFS (FastString u1# l1# b1#) (FastString u2# l2# b2#) =
+  if u1# ==# u2# then EQ else
+  let l# = if l1# <=# l2# then l1# else l2# in
+  unsafePerformIO (
+    strncmp b1# b2# l# >>= \ (I# res) ->
     return (
     if      res <#  0# then LT
-    else if res ==# 0# then EQ
+    else if res ==# 0# then 
+	if l1# ==# l2# then EQ
+	else if l1# <# l2# then LT else GT
     else		    GT
     ))
 
-foreign import ccall "strcmp" unsafe 
-  strcmp :: ByteArray# -> ByteArray# -> IO Int
+foreign import ccall "strncmp" unsafe 
+  strncmp :: ByteArray# -> ByteArray# -> Int# -> IO Int
 
 -- -----------------------------------------------------------------------------
 -- Outputting 'FastString's
-- 
1.7.10.4