FileUtilities.cpp revision 8475ec068c213d0bf73f7686d82491a8f12e3b32
17a6ff2b98e0c7d4c54a4c04edb4357371f34d17fChris Lattner//===- Support/FileUtilities.cpp - File System Utilities ------------------===// 2f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman// 3b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// The LLVM Compiler Infrastructure 4b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// 5b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// This file was developed by the LLVM research group and is distributed under 6b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// the University of Illinois Open Source License. See LICENSE.TXT for details. 7f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman// 8b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell//===----------------------------------------------------------------------===// 97a6ff2b98e0c7d4c54a4c04edb4357371f34d17fChris Lattner// 107a6ff2b98e0c7d4c54a4c04edb4357371f34d17fChris Lattner// This file implements a family of utility functions which are useful for doing 117a6ff2b98e0c7d4c54a4c04edb4357371f34d17fChris Lattner// various things with files. 127a6ff2b98e0c7d4c54a4c04edb4357371f34d17fChris Lattner// 137a6ff2b98e0c7d4c54a4c04edb4357371f34d17fChris Lattner//===----------------------------------------------------------------------===// 147a6ff2b98e0c7d4c54a4c04edb4357371f34d17fChris Lattner 15551ccae044b0ff658fe629dd67edd5ffe75d10e8Reid Spencer#include "llvm/Support/FileUtilities.h" 169d88d1aaab145e18c8e0fe93544f8a1ff0474866Reid Spencer#include "llvm/System/Path.h" 1744542539233acdaf1a72179cd38506478b432de9Chris Lattner#include "llvm/System/MappedFile.h" 1844542539233acdaf1a72179cd38506478b432de9Chris Lattner#include "llvm/ADT/StringExtras.h" 192ee51cbeb8f83f0b04d9611535151c801bbe3d4bChris Lattner#include <cstring> 20c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner#include <cctype> 212cdd21c2e4d855500dfb53f77aa74da53ccf9de6Chris Lattnerusing namespace llvm; 22d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke 2344542539233acdaf1a72179cd38506478b432de9Chris Lattnerstatic bool isNumberChar(char C) { 2444542539233acdaf1a72179cd38506478b432de9Chris Lattner switch (C) { 2544542539233acdaf1a72179cd38506478b432de9Chris Lattner case '0': case '1': case '2': case '3': case '4': 26f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman case '5': case '6': case '7': case '8': case '9': 2744542539233acdaf1a72179cd38506478b432de9Chris Lattner case '.': case '+': case '-': 288dcd5483bce94be0ac02dd5c8b749a9a2458ee2bChris Lattner case 'D': // Strange exponential notation. 298dcd5483bce94be0ac02dd5c8b749a9a2458ee2bChris Lattner case 'd': // Strange exponential notation. 3044542539233acdaf1a72179cd38506478b432de9Chris Lattner case 'e': 3144542539233acdaf1a72179cd38506478b432de9Chris Lattner case 'E': return true; 3244542539233acdaf1a72179cd38506478b432de9Chris Lattner default: return false; 3344542539233acdaf1a72179cd38506478b432de9Chris Lattner } 3444542539233acdaf1a72179cd38506478b432de9Chris Lattner} 3544542539233acdaf1a72179cd38506478b432de9Chris Lattner 3644542539233acdaf1a72179cd38506478b432de9Chris Lattnerstatic char *BackupNumber(char *Pos, char *FirstChar) { 3744542539233acdaf1a72179cd38506478b432de9Chris Lattner // If we didn't stop in the middle of a number, don't backup. 3844542539233acdaf1a72179cd38506478b432de9Chris Lattner if (!isNumberChar(*Pos)) return Pos; 3944542539233acdaf1a72179cd38506478b432de9Chris Lattner 4044542539233acdaf1a72179cd38506478b432de9Chris Lattner // Otherwise, return to the start of the number. 4144542539233acdaf1a72179cd38506478b432de9Chris Lattner while (Pos > FirstChar && isNumberChar(Pos[-1])) 4244542539233acdaf1a72179cd38506478b432de9Chris Lattner --Pos; 4344542539233acdaf1a72179cd38506478b432de9Chris Lattner return Pos; 4444542539233acdaf1a72179cd38506478b432de9Chris Lattner} 4544542539233acdaf1a72179cd38506478b432de9Chris Lattner 4644542539233acdaf1a72179cd38506478b432de9Chris Lattner/// CompareNumbers - compare two numbers, returning true if they are different. 4744542539233acdaf1a72179cd38506478b432de9Chris Lattnerstatic bool CompareNumbers(char *&F1P, char *&F2P, char *F1End, char *F2End, 4844542539233acdaf1a72179cd38506478b432de9Chris Lattner double AbsTolerance, double RelTolerance, 4944542539233acdaf1a72179cd38506478b432de9Chris Lattner std::string *ErrorMsg) { 5044542539233acdaf1a72179cd38506478b432de9Chris Lattner char *F1NumEnd, *F2NumEnd; 51f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman double V1 = 0.0, V2 = 0.0; 52c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner 53c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner // If one of the positions is at a space and the other isn't, chomp up 'til 54c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner // the end of the space. 55c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner while (isspace(*F1P) && F1P != F1End) 56c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner ++F1P; 57c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner while (isspace(*F2P) && F2P != F2End) 58c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner ++F2P; 59c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner 608dcd5483bce94be0ac02dd5c8b749a9a2458ee2bChris Lattner // If we stop on numbers, compare their difference. Note that some ugliness 618dcd5483bce94be0ac02dd5c8b749a9a2458ee2bChris Lattner // is built into this to permit support for numbers that use "D" or "d" as 628dcd5483bce94be0ac02dd5c8b749a9a2458ee2bChris Lattner // their exponential marker, e.g. "1.234D45". This occurs in 200.sixtrack in 638dcd5483bce94be0ac02dd5c8b749a9a2458ee2bChris Lattner // spec2k. 6444542539233acdaf1a72179cd38506478b432de9Chris Lattner if (isNumberChar(*F1P) && isNumberChar(*F2P)) { 658dcd5483bce94be0ac02dd5c8b749a9a2458ee2bChris Lattner bool isDNotation; 668dcd5483bce94be0ac02dd5c8b749a9a2458ee2bChris Lattner do { 678dcd5483bce94be0ac02dd5c8b749a9a2458ee2bChris Lattner isDNotation = false; 688dcd5483bce94be0ac02dd5c8b749a9a2458ee2bChris Lattner V1 = strtod(F1P, &F1NumEnd); 698dcd5483bce94be0ac02dd5c8b749a9a2458ee2bChris Lattner V2 = strtod(F2P, &F2NumEnd); 708dcd5483bce94be0ac02dd5c8b749a9a2458ee2bChris Lattner 718dcd5483bce94be0ac02dd5c8b749a9a2458ee2bChris Lattner if (*F1NumEnd == 'D' || *F1NumEnd == 'd') { 728dcd5483bce94be0ac02dd5c8b749a9a2458ee2bChris Lattner *F1NumEnd = 'e'; // Strange exponential notation! 738dcd5483bce94be0ac02dd5c8b749a9a2458ee2bChris Lattner isDNotation = true; 748dcd5483bce94be0ac02dd5c8b749a9a2458ee2bChris Lattner } 758dcd5483bce94be0ac02dd5c8b749a9a2458ee2bChris Lattner if (*F2NumEnd == 'D' || *F2NumEnd == 'd') { 768dcd5483bce94be0ac02dd5c8b749a9a2458ee2bChris Lattner *F2NumEnd = 'e'; // Strange exponential notation! 778dcd5483bce94be0ac02dd5c8b749a9a2458ee2bChris Lattner isDNotation = true; 788dcd5483bce94be0ac02dd5c8b749a9a2458ee2bChris Lattner } 798dcd5483bce94be0ac02dd5c8b749a9a2458ee2bChris Lattner } while (isDNotation); 8044542539233acdaf1a72179cd38506478b432de9Chris Lattner } else { 8144542539233acdaf1a72179cd38506478b432de9Chris Lattner // Otherwise, the diff failed. 8244542539233acdaf1a72179cd38506478b432de9Chris Lattner F1NumEnd = F1P; 8344542539233acdaf1a72179cd38506478b432de9Chris Lattner F2NumEnd = F2P; 8444542539233acdaf1a72179cd38506478b432de9Chris Lattner } 8544542539233acdaf1a72179cd38506478b432de9Chris Lattner 8644542539233acdaf1a72179cd38506478b432de9Chris Lattner if (F1NumEnd == F1P || F2NumEnd == F2P) { 87bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer if (ErrorMsg) { 88bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer *ErrorMsg = "FP Comparison failed, not a numeric difference between '"; 89bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer *ErrorMsg += F1P[0]; 90bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer *ErrorMsg += "' and '"; 91bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer *ErrorMsg += F2P[0]; 92bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer *ErrorMsg += "'"; 93bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer } 9444542539233acdaf1a72179cd38506478b432de9Chris Lattner return true; 9544542539233acdaf1a72179cd38506478b432de9Chris Lattner } 9644542539233acdaf1a72179cd38506478b432de9Chris Lattner 9744542539233acdaf1a72179cd38506478b432de9Chris Lattner // Check to see if these are inside the absolute tolerance 9844542539233acdaf1a72179cd38506478b432de9Chris Lattner if (AbsTolerance < std::abs(V1-V2)) { 9944542539233acdaf1a72179cd38506478b432de9Chris Lattner // Nope, check the relative tolerance... 10044542539233acdaf1a72179cd38506478b432de9Chris Lattner double Diff; 10144542539233acdaf1a72179cd38506478b432de9Chris Lattner if (V2) 10244542539233acdaf1a72179cd38506478b432de9Chris Lattner Diff = std::abs(V1/V2 - 1.0); 10344542539233acdaf1a72179cd38506478b432de9Chris Lattner else if (V1) 10444542539233acdaf1a72179cd38506478b432de9Chris Lattner Diff = std::abs(V2/V1 - 1.0); 10544542539233acdaf1a72179cd38506478b432de9Chris Lattner else 10644542539233acdaf1a72179cd38506478b432de9Chris Lattner Diff = 0; // Both zero. 10744542539233acdaf1a72179cd38506478b432de9Chris Lattner if (Diff > RelTolerance) { 10844542539233acdaf1a72179cd38506478b432de9Chris Lattner if (ErrorMsg) { 1099df1246a1547064adc827318c4e8644be511244bReid Spencer *ErrorMsg = "Compared: " + ftostr(V1) + " and " + ftostr(V2) + "\n"; 1109df1246a1547064adc827318c4e8644be511244bReid Spencer *ErrorMsg += "abs. diff = " + ftostr(std::abs(V1-V2)) + 1119df1246a1547064adc827318c4e8644be511244bReid Spencer " rel.diff = " + ftostr(Diff) + "\n"; 11244542539233acdaf1a72179cd38506478b432de9Chris Lattner *ErrorMsg += "Out of tolerance: rel/abs: " + ftostr(RelTolerance) + 11344542539233acdaf1a72179cd38506478b432de9Chris Lattner "/" + ftostr(AbsTolerance); 11444542539233acdaf1a72179cd38506478b432de9Chris Lattner } 11544542539233acdaf1a72179cd38506478b432de9Chris Lattner return true; 11644542539233acdaf1a72179cd38506478b432de9Chris Lattner } 11744542539233acdaf1a72179cd38506478b432de9Chris Lattner } 11844542539233acdaf1a72179cd38506478b432de9Chris Lattner 11944542539233acdaf1a72179cd38506478b432de9Chris Lattner // Otherwise, advance our read pointers to the end of the numbers. 12044542539233acdaf1a72179cd38506478b432de9Chris Lattner F1P = F1NumEnd; F2P = F2NumEnd; 12144542539233acdaf1a72179cd38506478b432de9Chris Lattner return false; 12244542539233acdaf1a72179cd38506478b432de9Chris Lattner} 12344542539233acdaf1a72179cd38506478b432de9Chris Lattner 12444542539233acdaf1a72179cd38506478b432de9Chris Lattner// PadFileIfNeeded - If the files are not identical, we will have to be doing 12544542539233acdaf1a72179cd38506478b432de9Chris Lattner// numeric comparisons in here. There are bad cases involved where we (i.e., 12644542539233acdaf1a72179cd38506478b432de9Chris Lattner// strtod) might run off the beginning or end of the file if it starts or ends 12744542539233acdaf1a72179cd38506478b432de9Chris Lattner// with a number. Because of this, if needed, we pad the file so that it starts 12844542539233acdaf1a72179cd38506478b432de9Chris Lattner// and ends with a null character. 12944542539233acdaf1a72179cd38506478b432de9Chris Lattnerstatic void PadFileIfNeeded(char *&FileStart, char *&FileEnd, char *&FP) { 130da7e70e058108fb444741a721ccfb38d40154e5bChris Lattner if (FileStart-FileEnd < 2 || 131da7e70e058108fb444741a721ccfb38d40154e5bChris Lattner isNumberChar(FileStart[0]) || isNumberChar(FileEnd[-1])) { 13244542539233acdaf1a72179cd38506478b432de9Chris Lattner unsigned FileLen = FileEnd-FileStart; 13344542539233acdaf1a72179cd38506478b432de9Chris Lattner char *NewFile = new char[FileLen+2]; 13444542539233acdaf1a72179cd38506478b432de9Chris Lattner NewFile[0] = 0; // Add null padding 13544542539233acdaf1a72179cd38506478b432de9Chris Lattner NewFile[FileLen+1] = 0; // Add null padding 13644542539233acdaf1a72179cd38506478b432de9Chris Lattner memcpy(NewFile+1, FileStart, FileLen); 13744542539233acdaf1a72179cd38506478b432de9Chris Lattner FP = NewFile+(FP-FileStart)+1; 13844542539233acdaf1a72179cd38506478b432de9Chris Lattner FileStart = NewFile+1; 13944542539233acdaf1a72179cd38506478b432de9Chris Lattner FileEnd = FileStart+FileLen; 14044542539233acdaf1a72179cd38506478b432de9Chris Lattner } 14144542539233acdaf1a72179cd38506478b432de9Chris Lattner} 14244542539233acdaf1a72179cd38506478b432de9Chris Lattner 14344542539233acdaf1a72179cd38506478b432de9Chris Lattner/// DiffFilesWithTolerance - Compare the two files specified, returning 0 if the 14444542539233acdaf1a72179cd38506478b432de9Chris Lattner/// files match, 1 if they are different, and 2 if there is a file error. This 14544542539233acdaf1a72179cd38506478b432de9Chris Lattner/// function differs from DiffFiles in that you can specify an absolete and 14644542539233acdaf1a72179cd38506478b432de9Chris Lattner/// relative FP error that is allowed to exist. If you specify a string to fill 14744542539233acdaf1a72179cd38506478b432de9Chris Lattner/// in for the error option, it will set the string to an error message if an 14844542539233acdaf1a72179cd38506478b432de9Chris Lattner/// error occurs, allowing the caller to distinguish between a failed diff and a 14944542539233acdaf1a72179cd38506478b432de9Chris Lattner/// file system error. 15044542539233acdaf1a72179cd38506478b432de9Chris Lattner/// 151cc1b90b0e768478c2f7d62f7e1cbc95d8e6cb237Chris Lattnerint llvm::DiffFilesWithTolerance(const sys::Path &FileA, 152cc1b90b0e768478c2f7d62f7e1cbc95d8e6cb237Chris Lattner const sys::Path &FileB, 15344542539233acdaf1a72179cd38506478b432de9Chris Lattner double AbsTol, double RelTol, 15444542539233acdaf1a72179cd38506478b432de9Chris Lattner std::string *Error) { 1558475ec068c213d0bf73f7686d82491a8f12e3b32Reid Spencer const sys::FileStatus *FileAStat = FileA.getFileStatus(false, Error); 1568475ec068c213d0bf73f7686d82491a8f12e3b32Reid Spencer if (!FileAStat) 157252ad03d7db0add504fdcc6bd67c1bc1e28bdd57Chris Lattner return 2; 1588475ec068c213d0bf73f7686d82491a8f12e3b32Reid Spencer const sys::FileStatus *FileBStat = FileB.getFileStatus(false, Error); 1598475ec068c213d0bf73f7686d82491a8f12e3b32Reid Spencer if (!FileBStat) 160862796959796d69fa490107d880854739660ffadReid Spencer return 2; 161862796959796d69fa490107d880854739660ffadReid Spencer 162252ad03d7db0add504fdcc6bd67c1bc1e28bdd57Chris Lattner // Check for zero length files because some systems croak when you try to 163252ad03d7db0add504fdcc6bd67c1bc1e28bdd57Chris Lattner // mmap an empty file. 1648475ec068c213d0bf73f7686d82491a8f12e3b32Reid Spencer size_t A_size = FileAStat->getSize(); 1658475ec068c213d0bf73f7686d82491a8f12e3b32Reid Spencer size_t B_size = FileBStat->getSize(); 166252ad03d7db0add504fdcc6bd67c1bc1e28bdd57Chris Lattner 167252ad03d7db0add504fdcc6bd67c1bc1e28bdd57Chris Lattner // If they are both zero sized then they're the same 168252ad03d7db0add504fdcc6bd67c1bc1e28bdd57Chris Lattner if (A_size == 0 && B_size == 0) 169252ad03d7db0add504fdcc6bd67c1bc1e28bdd57Chris Lattner return 0; 170bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer 171252ad03d7db0add504fdcc6bd67c1bc1e28bdd57Chris Lattner // If only one of them is zero sized then they can't be the same 172bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer if ((A_size == 0 || B_size == 0)) { 173bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer if (Error) 174bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer *Error = "Files differ: one is zero-sized, the other isn't"; 175252ad03d7db0add504fdcc6bd67c1bc1e28bdd57Chris Lattner return 1; 176bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer } 17745d55641fa3af536e48be446647ff51b15109992Reid Spencer 17830493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Now its safe to mmap the files into memory becasue both files 17930493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // have a non-zero size. 18030493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer sys::MappedFile F1; 18130493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (F1.open(FileA, sys::MappedFile::READ_ACCESS, Error)) 18230493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer return 2; 18330493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer sys::MappedFile F2; 18430493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (F2.open(FileB, sys::MappedFile::READ_ACCESS, Error)) 18530493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer return 2; 18630493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (!F1.map(Error)) 18730493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer return 2; 18830493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (!F2.map(Error)) 18930493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer return 2; 190f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 19130493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Okay, now that we opened the files, scan them for the first difference. 19230493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer char *File1Start = F1.charBase(); 19330493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer char *File2Start = F2.charBase(); 19430493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer char *File1End = File1Start+A_size; 19530493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer char *File2End = File2Start+B_size; 19630493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer char *F1P = File1Start; 19730493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer char *F2P = File2Start; 19830493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer 19930493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (A_size == B_size) { 20030493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Are the buffers identical? 20130493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (std::memcmp(File1Start, File2Start, A_size) == 0) 20230493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer return 0; 20330493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer 204bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer if (AbsTol == 0 && RelTol == 0) { 205bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer if (Error) 206bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer *Error = "Files differ without tolerance allowance"; 20730493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer return 1; // Files different! 208bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer } 20930493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer } 21044542539233acdaf1a72179cd38506478b432de9Chris Lattner 21130493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer char *OrigFile1Start = File1Start; 21230493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer char *OrigFile2Start = File2Start; 21344542539233acdaf1a72179cd38506478b432de9Chris Lattner 21430493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // If the files need padding, do so now. 21530493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer PadFileIfNeeded(File1Start, File1End, F1P); 21630493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer PadFileIfNeeded(File2Start, File2End, F2P); 21744542539233acdaf1a72179cd38506478b432de9Chris Lattner 21830493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer bool CompareFailed = false; 21930493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer while (1) { 22030493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Scan for the end of file or next difference. 22130493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer while (F1P < File1End && F2P < File2End && *F1P == *F2P) 22230493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer ++F1P, ++F2P; 22344542539233acdaf1a72179cd38506478b432de9Chris Lattner 22430493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (F1P >= File1End || F2P >= File2End) break; 22544542539233acdaf1a72179cd38506478b432de9Chris Lattner 22630493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Okay, we must have found a difference. Backup to the start of the 22730493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // current number each stream is at so that we can compare from the 22830493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // beginning. 22930493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer F1P = BackupNumber(F1P, File1Start); 23030493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer F2P = BackupNumber(F2P, File2Start); 23144542539233acdaf1a72179cd38506478b432de9Chris Lattner 23230493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Now that we are at the start of the numbers, compare them, exiting if 23330493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // they don't match. 23430493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (CompareNumbers(F1P, F2P, File1End, File2End, AbsTol, RelTol, Error)) { 23530493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer CompareFailed = true; 23630493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer break; 23744542539233acdaf1a72179cd38506478b432de9Chris Lattner } 23830493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer } 23944542539233acdaf1a72179cd38506478b432de9Chris Lattner 24030493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Okay, we reached the end of file. If both files are at the end, we 24130493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // succeeded. 24230493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer bool F1AtEnd = F1P >= File1End; 24330493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer bool F2AtEnd = F2P >= File2End; 24430493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (!CompareFailed && (!F1AtEnd || !F2AtEnd)) { 24530493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Else, we might have run off the end due to a number: backup and retry. 24630493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (F1AtEnd && isNumberChar(F1P[-1])) --F1P; 24730493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (F2AtEnd && isNumberChar(F2P[-1])) --F2P; 24830493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer F1P = BackupNumber(F1P, File1Start); 24930493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer F2P = BackupNumber(F2P, File2Start); 25030493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer 25130493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Now that we are at the start of the numbers, compare them, exiting if 25230493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // they don't match. 25330493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (CompareNumbers(F1P, F2P, File1End, File2End, AbsTol, RelTol, Error)) 25430493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer CompareFailed = true; 25530493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer 25630493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // If we found the end, we succeeded. 25730493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (F1P < File1End || F2P < File2End) 25830493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer CompareFailed = true; 25944542539233acdaf1a72179cd38506478b432de9Chris Lattner } 26030493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer 26130493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (OrigFile1Start != File1Start) 26230493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer delete[] (File1Start-1); // Back up past null byte 26330493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (OrigFile2Start != File2Start) 26430493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer delete[] (File2Start-1); // Back up past null byte 26530493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer return CompareFailed; 26644542539233acdaf1a72179cd38506478b432de9Chris Lattner} 267