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Instead of doing a manual comparison loop, just use memcmp, thanks to JohnC

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for the suggestion! :)

llvm-svn: 20203
This commit is contained in:
Chris Lattner 2005-02-15 22:12:10 +00:00
parent 4139a6ea3d
commit 6a86178364
1 changed files with 6 additions and 9 deletions
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15
lib/Support/FileUtilities.cpp
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@ -17,6 +17,7 @@
#include "llvm/System/MappedFile.h"
#include "llvm/ADT/StringExtras.h"
#include <cmath>
#include <cstring>
using namespace llvm;
static bool isNumberChar(char C) {
@ -141,19 +142,15 @@ int llvm::DiffFilesWithTolerance(const sys::Path &FileA,
// Okay, now that we opened the files, scan them for the first difference.
char *File1Start = F1.charBase();
char *File2Start = F2.charBase();
char *File1End = File1Start+F1.size();
char *File2End = File2Start+F2.size();
char *File1End = File1Start+A_size;
char *File2End = File2Start+B_size;
char *F1P = File1Start;
char *F2P = File2Start;
if (A_size == B_size) {
// Scan for the end of file or first difference.
while (F1P < File1End && *F1P == *F2P)
++F1P, ++F2P;
// Common case: identifical files.
if (F1P == File1End)
return 0; // Scanned to end, files same
// Are the buffers identical?
if (std::memcmp(File1Start, File2Start, A_size) == 0)
return 0;
if (AbsTol == 0 && RelTol == 0)
return 1; // Files different!