FileUtilities.cpp revision a7750c1142baa5ad812d5209526a0b6568201e0e
17a6ff2b98e0c7d4c54a4c04edb4357371f34d17fChris Lattner//===- Support/FileUtilities.cpp - File System Utilities ------------------===// 2f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman// 3b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// The LLVM Compiler Infrastructure 4b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// 54ee451de366474b9c228b4e5fa573795a715216dChris Lattner// This file is distributed under the University of Illinois Open Source 64ee451de366474b9c228b4e5fa573795a715216dChris Lattner// 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" 17a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner#include "llvm/Support/MemoryBuffer.h" 18a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner#include "llvm/ADT/OwningPtr.h" 19a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner#include "llvm/ADT/SmallString.h" 2044542539233acdaf1a72179cd38506478b432de9Chris Lattner#include "llvm/ADT/StringExtras.h" 21ae9f3a3b7c915f725aef5a7250e88eaeddda03c6Anton Korobeynikov#include <cstdlib> 222ee51cbeb8f83f0b04d9611535151c801bbe3d4bChris Lattner#include <cstring> 23c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner#include <cctype> 242cdd21c2e4d855500dfb53f77aa74da53ccf9de6Chris Lattnerusing namespace llvm; 25d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke 26599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venanciostatic bool isSignedChar(char C) { 2742f6e455de71099d12d30dc928748147bfc8f801Lauro Ramos Venancio return (C == '+' || C == '-'); 28599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venancio} 29599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venancio 3042f6e455de71099d12d30dc928748147bfc8f801Lauro Ramos Venanciostatic bool isExponentChar(char C) { 3144542539233acdaf1a72179cd38506478b432de9Chris Lattner switch (C) { 328dcd5483bce94be0ac02dd5c8b749a9a2458ee2bChris Lattner case 'D': // Strange exponential notation. 338dcd5483bce94be0ac02dd5c8b749a9a2458ee2bChris Lattner case 'd': // Strange exponential notation. 3444542539233acdaf1a72179cd38506478b432de9Chris Lattner case 'e': 3544542539233acdaf1a72179cd38506478b432de9Chris Lattner case 'E': return true; 3644542539233acdaf1a72179cd38506478b432de9Chris Lattner default: return false; 3744542539233acdaf1a72179cd38506478b432de9Chris Lattner } 3844542539233acdaf1a72179cd38506478b432de9Chris Lattner} 3944542539233acdaf1a72179cd38506478b432de9Chris Lattner 40599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venanciostatic bool isNumberChar(char C) { 41599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venancio switch (C) { 42599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venancio case '0': case '1': case '2': case '3': case '4': 43599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venancio case '5': case '6': case '7': case '8': case '9': 44599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venancio case '.': return true; 4542f6e455de71099d12d30dc928748147bfc8f801Lauro Ramos Venancio default: return isSignedChar(C) || isExponentChar(C); 46599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venancio } 47599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venancio} 48599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venancio 49a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattnerstatic const char *BackupNumber(const char *Pos, const char *FirstChar) { 5044542539233acdaf1a72179cd38506478b432de9Chris Lattner // If we didn't stop in the middle of a number, don't backup. 5144542539233acdaf1a72179cd38506478b432de9Chris Lattner if (!isNumberChar(*Pos)) return Pos; 5244542539233acdaf1a72179cd38506478b432de9Chris Lattner 5344542539233acdaf1a72179cd38506478b432de9Chris Lattner // Otherwise, return to the start of the number. 54599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venancio while (Pos > FirstChar && isNumberChar(Pos[-1])) { 5544542539233acdaf1a72179cd38506478b432de9Chris Lattner --Pos; 5642f6e455de71099d12d30dc928748147bfc8f801Lauro Ramos Venancio if (Pos > FirstChar && isSignedChar(Pos[0]) && !isExponentChar(Pos[-1])) 57599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venancio break; 58599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venancio } 5944542539233acdaf1a72179cd38506478b432de9Chris Lattner return Pos; 6044542539233acdaf1a72179cd38506478b432de9Chris Lattner} 6144542539233acdaf1a72179cd38506478b432de9Chris Lattner 62a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner/// EndOfNumber - Return the first character that is not part of the specified 63a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner/// number. This assumes that the buffer is null terminated, so it won't fall 64a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner/// off the end. 65a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattnerstatic const char *EndOfNumber(const char *Pos) { 66a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner while (isNumberChar(*Pos)) 67a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner ++Pos; 68a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner return Pos; 69a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner} 70a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner 7144542539233acdaf1a72179cd38506478b432de9Chris Lattner/// CompareNumbers - compare two numbers, returning true if they are different. 72a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattnerstatic bool CompareNumbers(const char *&F1P, const char *&F2P, 73a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner const char *F1End, const char *F2End, 7444542539233acdaf1a72179cd38506478b432de9Chris Lattner double AbsTolerance, double RelTolerance, 7544542539233acdaf1a72179cd38506478b432de9Chris Lattner std::string *ErrorMsg) { 76a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner const char *F1NumEnd, *F2NumEnd; 77f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman double V1 = 0.0, V2 = 0.0; 78c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner 79c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner // If one of the positions is at a space and the other isn't, chomp up 'til 80c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner // the end of the space. 81c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner while (isspace(*F1P) && F1P != F1End) 82c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner ++F1P; 83c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner while (isspace(*F2P) && F2P != F2End) 84c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner ++F2P; 85c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner 86a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner // If we stop on numbers, compare their difference. 87a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner if (!isNumberChar(*F1P) || !isNumberChar(*F2P)) { 88a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner // The diff failed. 8944542539233acdaf1a72179cd38506478b432de9Chris Lattner F1NumEnd = F1P; 9044542539233acdaf1a72179cd38506478b432de9Chris Lattner F2NumEnd = F2P; 91a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner } else { 92a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner // Note that some ugliness is built into this to permit support for numbers 93a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner // that use "D" or "d" as their exponential marker, e.g. "1.234D45". This 94a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner // occurs in 200.sixtrack in spec2k. 95a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner V1 = strtod(F1P, const_cast<char**>(&F1NumEnd)); 96a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner V2 = strtod(F2P, const_cast<char**>(&F2NumEnd)); 97a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner 98a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner if (*F1NumEnd == 'D' || *F1NumEnd == 'd') { 99a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner // Copy string into tmp buffer to replace the 'D' with an 'e'. 100a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner SmallString<200> StrTmp(F1P, EndOfNumber(F1NumEnd)+1); 101a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner StrTmp[F1NumEnd-F1P] = 'e'; // Strange exponential notation! 102a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner 103a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner V1 = strtod(&StrTmp[0], const_cast<char**>(&F1NumEnd)); 104a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner F1NumEnd = F1P + (F1NumEnd-&StrTmp[0]); 105a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner } 106a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner 107a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner if (*F2NumEnd == 'D' || *F2NumEnd == 'd') { 108a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner // Copy string into tmp buffer to replace the 'D' with an 'e'. 109a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner SmallString<200> StrTmp(F2P, EndOfNumber(F2NumEnd)+1); 110a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner StrTmp[F2NumEnd-F2P] = 'e'; // Strange exponential notation! 111a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner 112a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner V2 = strtod(&StrTmp[0], const_cast<char**>(&F2NumEnd)); 113a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner F2NumEnd = F2P + (F2NumEnd-&StrTmp[0]); 114a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner } 11544542539233acdaf1a72179cd38506478b432de9Chris Lattner } 11644542539233acdaf1a72179cd38506478b432de9Chris Lattner 11744542539233acdaf1a72179cd38506478b432de9Chris Lattner if (F1NumEnd == F1P || F2NumEnd == F2P) { 118bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer if (ErrorMsg) { 119bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer *ErrorMsg = "FP Comparison failed, not a numeric difference between '"; 120bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer *ErrorMsg += F1P[0]; 121bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer *ErrorMsg += "' and '"; 122bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer *ErrorMsg += F2P[0]; 123bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer *ErrorMsg += "'"; 124bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer } 12544542539233acdaf1a72179cd38506478b432de9Chris Lattner return true; 12644542539233acdaf1a72179cd38506478b432de9Chris Lattner } 12744542539233acdaf1a72179cd38506478b432de9Chris Lattner 12844542539233acdaf1a72179cd38506478b432de9Chris Lattner // Check to see if these are inside the absolute tolerance 12944542539233acdaf1a72179cd38506478b432de9Chris Lattner if (AbsTolerance < std::abs(V1-V2)) { 13044542539233acdaf1a72179cd38506478b432de9Chris Lattner // Nope, check the relative tolerance... 13144542539233acdaf1a72179cd38506478b432de9Chris Lattner double Diff; 13244542539233acdaf1a72179cd38506478b432de9Chris Lattner if (V2) 13344542539233acdaf1a72179cd38506478b432de9Chris Lattner Diff = std::abs(V1/V2 - 1.0); 13444542539233acdaf1a72179cd38506478b432de9Chris Lattner else if (V1) 13544542539233acdaf1a72179cd38506478b432de9Chris Lattner Diff = std::abs(V2/V1 - 1.0); 13644542539233acdaf1a72179cd38506478b432de9Chris Lattner else 13744542539233acdaf1a72179cd38506478b432de9Chris Lattner Diff = 0; // Both zero. 13844542539233acdaf1a72179cd38506478b432de9Chris Lattner if (Diff > RelTolerance) { 13944542539233acdaf1a72179cd38506478b432de9Chris Lattner if (ErrorMsg) { 1409df1246a1547064adc827318c4e8644be511244bReid Spencer *ErrorMsg = "Compared: " + ftostr(V1) + " and " + ftostr(V2) + "\n"; 1419df1246a1547064adc827318c4e8644be511244bReid Spencer *ErrorMsg += "abs. diff = " + ftostr(std::abs(V1-V2)) + 1429df1246a1547064adc827318c4e8644be511244bReid Spencer " rel.diff = " + ftostr(Diff) + "\n"; 14344542539233acdaf1a72179cd38506478b432de9Chris Lattner *ErrorMsg += "Out of tolerance: rel/abs: " + ftostr(RelTolerance) + 14444542539233acdaf1a72179cd38506478b432de9Chris Lattner "/" + ftostr(AbsTolerance); 14544542539233acdaf1a72179cd38506478b432de9Chris Lattner } 14644542539233acdaf1a72179cd38506478b432de9Chris Lattner return true; 14744542539233acdaf1a72179cd38506478b432de9Chris Lattner } 14844542539233acdaf1a72179cd38506478b432de9Chris Lattner } 14944542539233acdaf1a72179cd38506478b432de9Chris Lattner 15044542539233acdaf1a72179cd38506478b432de9Chris Lattner // Otherwise, advance our read pointers to the end of the numbers. 15144542539233acdaf1a72179cd38506478b432de9Chris Lattner F1P = F1NumEnd; F2P = F2NumEnd; 15244542539233acdaf1a72179cd38506478b432de9Chris Lattner return false; 15344542539233acdaf1a72179cd38506478b432de9Chris Lattner} 15444542539233acdaf1a72179cd38506478b432de9Chris Lattner 15544542539233acdaf1a72179cd38506478b432de9Chris Lattner/// DiffFilesWithTolerance - Compare the two files specified, returning 0 if the 15644542539233acdaf1a72179cd38506478b432de9Chris Lattner/// files match, 1 if they are different, and 2 if there is a file error. This 15744542539233acdaf1a72179cd38506478b432de9Chris Lattner/// function differs from DiffFiles in that you can specify an absolete and 15844542539233acdaf1a72179cd38506478b432de9Chris Lattner/// relative FP error that is allowed to exist. If you specify a string to fill 15944542539233acdaf1a72179cd38506478b432de9Chris Lattner/// in for the error option, it will set the string to an error message if an 16044542539233acdaf1a72179cd38506478b432de9Chris Lattner/// error occurs, allowing the caller to distinguish between a failed diff and a 16144542539233acdaf1a72179cd38506478b432de9Chris Lattner/// file system error. 16244542539233acdaf1a72179cd38506478b432de9Chris Lattner/// 163c74b4615071151b20fb1f82b11f85c2a1ba53e75Reid Spencerint llvm::DiffFilesWithTolerance(const sys::PathWithStatus &FileA, 164c74b4615071151b20fb1f82b11f85c2a1ba53e75Reid Spencer const sys::PathWithStatus &FileB, 16544542539233acdaf1a72179cd38506478b432de9Chris Lattner double AbsTol, double RelTol, 16644542539233acdaf1a72179cd38506478b432de9Chris Lattner std::string *Error) { 1678475ec068c213d0bf73f7686d82491a8f12e3b32Reid Spencer const sys::FileStatus *FileAStat = FileA.getFileStatus(false, Error); 1688475ec068c213d0bf73f7686d82491a8f12e3b32Reid Spencer if (!FileAStat) 169252ad03d7db0add504fdcc6bd67c1bc1e28bdd57Chris Lattner return 2; 1708475ec068c213d0bf73f7686d82491a8f12e3b32Reid Spencer const sys::FileStatus *FileBStat = FileB.getFileStatus(false, Error); 1718475ec068c213d0bf73f7686d82491a8f12e3b32Reid Spencer if (!FileBStat) 172862796959796d69fa490107d880854739660ffadReid Spencer return 2; 173862796959796d69fa490107d880854739660ffadReid Spencer 174252ad03d7db0add504fdcc6bd67c1bc1e28bdd57Chris Lattner // Check for zero length files because some systems croak when you try to 175252ad03d7db0add504fdcc6bd67c1bc1e28bdd57Chris Lattner // mmap an empty file. 1768475ec068c213d0bf73f7686d82491a8f12e3b32Reid Spencer size_t A_size = FileAStat->getSize(); 1778475ec068c213d0bf73f7686d82491a8f12e3b32Reid Spencer size_t B_size = FileBStat->getSize(); 178252ad03d7db0add504fdcc6bd67c1bc1e28bdd57Chris Lattner 179252ad03d7db0add504fdcc6bd67c1bc1e28bdd57Chris Lattner // If they are both zero sized then they're the same 180252ad03d7db0add504fdcc6bd67c1bc1e28bdd57Chris Lattner if (A_size == 0 && B_size == 0) 181252ad03d7db0add504fdcc6bd67c1bc1e28bdd57Chris Lattner return 0; 182bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer 183252ad03d7db0add504fdcc6bd67c1bc1e28bdd57Chris Lattner // If only one of them is zero sized then they can't be the same 184bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer if ((A_size == 0 || B_size == 0)) { 185bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer if (Error) 186bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer *Error = "Files differ: one is zero-sized, the other isn't"; 187252ad03d7db0add504fdcc6bd67c1bc1e28bdd57Chris Lattner return 1; 188bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer } 18945d55641fa3af536e48be446647ff51b15109992Reid Spencer 19030493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Now its safe to mmap the files into memory becasue both files 19130493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // have a non-zero size. 192a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner OwningPtr<MemoryBuffer> F1(MemoryBuffer::getFile(FileA.c_str(), FileA.size(), 193a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner Error)); 194a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner OwningPtr<MemoryBuffer> F2(MemoryBuffer::getFile(FileB.c_str(), FileB.size(), 195a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner Error)); 196a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner if (F1 == 0 || F2 == 0) 19730493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer return 2; 198a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner 19930493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Okay, now that we opened the files, scan them for the first difference. 200a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner const char *File1Start = F1->getBufferStart(); 201a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner const char *File2Start = F2->getBufferStart(); 202a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner const char *File1End = F1->getBufferEnd(); 203a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner const char *File2End = F2->getBufferEnd(); 204a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner const char *F1P = File1Start; 205a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner const char *F2P = File2Start; 20630493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer 20730493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (A_size == B_size) { 208a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner // Are the buffers identical? Common case: Handle this efficiently. 20930493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (std::memcmp(File1Start, File2Start, A_size) == 0) 21030493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer return 0; 21130493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer 212bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer if (AbsTol == 0 && RelTol == 0) { 213bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer if (Error) 214bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer *Error = "Files differ without tolerance allowance"; 21530493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer return 1; // Files different! 216bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer } 21730493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer } 21844542539233acdaf1a72179cd38506478b432de9Chris Lattner 21930493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer bool CompareFailed = false; 22030493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer while (1) { 22130493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Scan for the end of file or next difference. 22230493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer while (F1P < File1End && F2P < File2End && *F1P == *F2P) 22330493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer ++F1P, ++F2P; 22444542539233acdaf1a72179cd38506478b432de9Chris Lattner 22530493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (F1P >= File1End || F2P >= File2End) break; 22644542539233acdaf1a72179cd38506478b432de9Chris Lattner 22730493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Okay, we must have found a difference. Backup to the start of the 22830493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // current number each stream is at so that we can compare from the 22930493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // beginning. 23030493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer F1P = BackupNumber(F1P, File1Start); 23130493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer F2P = BackupNumber(F2P, File2Start); 23244542539233acdaf1a72179cd38506478b432de9Chris Lattner 23330493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Now that we are at the start of the numbers, compare them, exiting if 23430493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // they don't match. 23530493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (CompareNumbers(F1P, F2P, File1End, File2End, AbsTol, RelTol, Error)) { 23630493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer CompareFailed = true; 23730493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer break; 23844542539233acdaf1a72179cd38506478b432de9Chris Lattner } 23930493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer } 24044542539233acdaf1a72179cd38506478b432de9Chris Lattner 24130493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Okay, we reached the end of file. If both files are at the end, we 24230493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // succeeded. 24330493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer bool F1AtEnd = F1P >= File1End; 24430493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer bool F2AtEnd = F2P >= File2End; 24530493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (!CompareFailed && (!F1AtEnd || !F2AtEnd)) { 24630493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Else, we might have run off the end due to a number: backup and retry. 24730493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (F1AtEnd && isNumberChar(F1P[-1])) --F1P; 24830493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (F2AtEnd && isNumberChar(F2P[-1])) --F2P; 24930493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer F1P = BackupNumber(F1P, File1Start); 25030493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer F2P = BackupNumber(F2P, File2Start); 25130493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer 25230493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Now that we are at the start of the numbers, compare them, exiting if 25330493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // they don't match. 25430493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (CompareNumbers(F1P, F2P, File1End, File2End, AbsTol, RelTol, Error)) 25530493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer CompareFailed = true; 25630493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer 25730493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // If we found the end, we succeeded. 25830493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (F1P < File1End || F2P < File2End) 25930493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer CompareFailed = true; 26044542539233acdaf1a72179cd38506478b432de9Chris Lattner } 26130493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer 26230493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer return CompareFailed; 26344542539233acdaf1a72179cd38506478b432de9Chris Lattner} 264