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" 16d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include "llvm/ADT/SmallString.h" 17a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner#include "llvm/Support/MemoryBuffer.h" 181f6efa3996dd1929fbc129203ce5009b620e6969Michael J. Spencer#include "llvm/Support/Path.h" 19d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include "llvm/Support/raw_ostream.h" 20d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include <cctype> 21ae9f3a3b7c915f725aef5a7250e88eaeddda03c6Anton Korobeynikov#include <cstdlib> 222ee51cbeb8f83f0b04d9611535151c801bbe3d4bChris Lattner#include <cstring> 23cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines#include <system_error> 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. 54d1c82fe726a8776cb965c5bf1f6f6c0d311ef6bcDaniel Dunbar bool HasPeriod = false; 55599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venancio while (Pos > FirstChar && isNumberChar(Pos[-1])) { 56d1c82fe726a8776cb965c5bf1f6f6c0d311ef6bcDaniel Dunbar // Backup over at most one period. 57d1c82fe726a8776cb965c5bf1f6f6c0d311ef6bcDaniel Dunbar if (Pos[-1] == '.') { 58d1c82fe726a8776cb965c5bf1f6f6c0d311ef6bcDaniel Dunbar if (HasPeriod) 59d1c82fe726a8776cb965c5bf1f6f6c0d311ef6bcDaniel Dunbar break; 60d1c82fe726a8776cb965c5bf1f6f6c0d311ef6bcDaniel Dunbar HasPeriod = true; 61d1c82fe726a8776cb965c5bf1f6f6c0d311ef6bcDaniel Dunbar } 62d1c82fe726a8776cb965c5bf1f6f6c0d311ef6bcDaniel Dunbar 6344542539233acdaf1a72179cd38506478b432de9Chris Lattner --Pos; 6442f6e455de71099d12d30dc928748147bfc8f801Lauro Ramos Venancio if (Pos > FirstChar && isSignedChar(Pos[0]) && !isExponentChar(Pos[-1])) 65599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venancio break; 66599ddf9a7693a315a03fc77cf612eec53dee5f67Lauro Ramos Venancio } 6744542539233acdaf1a72179cd38506478b432de9Chris Lattner return Pos; 6844542539233acdaf1a72179cd38506478b432de9Chris Lattner} 6944542539233acdaf1a72179cd38506478b432de9Chris Lattner 70a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner/// EndOfNumber - Return the first character that is not part of the specified 71a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner/// number. This assumes that the buffer is null terminated, so it won't fall 72a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner/// off the end. 73a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattnerstatic const char *EndOfNumber(const char *Pos) { 74a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner while (isNumberChar(*Pos)) 75a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner ++Pos; 76a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner return Pos; 77a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner} 78a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner 7944542539233acdaf1a72179cd38506478b432de9Chris Lattner/// CompareNumbers - compare two numbers, returning true if they are different. 80a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattnerstatic bool CompareNumbers(const char *&F1P, const char *&F2P, 81a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner const char *F1End, const char *F2End, 8244542539233acdaf1a72179cd38506478b432de9Chris Lattner double AbsTolerance, double RelTolerance, 8344542539233acdaf1a72179cd38506478b432de9Chris Lattner std::string *ErrorMsg) { 84a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner const char *F1NumEnd, *F2NumEnd; 85f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman double V1 = 0.0, V2 = 0.0; 86c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner 87c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner // If one of the positions is at a space and the other isn't, chomp up 'til 88c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner // the end of the space. 8987d0b9ed1462705dd9bf1cb7f67d0bf03af776c8Guy Benyei while (isspace(static_cast<unsigned char>(*F1P)) && F1P != F1End) 90c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner ++F1P; 9187d0b9ed1462705dd9bf1cb7f67d0bf03af776c8Guy Benyei while (isspace(static_cast<unsigned char>(*F2P)) && F2P != F2End) 92c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner ++F2P; 93c0d0e77042ef85ade9145ff2e922487a6e49cc07Chris Lattner 94a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner // If we stop on numbers, compare their difference. 95a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner if (!isNumberChar(*F1P) || !isNumberChar(*F2P)) { 96a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner // The diff failed. 9744542539233acdaf1a72179cd38506478b432de9Chris Lattner F1NumEnd = F1P; 9844542539233acdaf1a72179cd38506478b432de9Chris Lattner F2NumEnd = F2P; 99a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner } else { 100a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner // Note that some ugliness is built into this to permit support for numbers 101a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner // that use "D" or "d" as their exponential marker, e.g. "1.234D45". This 102a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner // occurs in 200.sixtrack in spec2k. 103a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner V1 = strtod(F1P, const_cast<char**>(&F1NumEnd)); 104a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner V2 = strtod(F2P, const_cast<char**>(&F2NumEnd)); 105a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner 106a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner if (*F1NumEnd == 'D' || *F1NumEnd == 'd') { 107a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner // Copy string into tmp buffer to replace the 'D' with an 'e'. 108a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner SmallString<200> StrTmp(F1P, EndOfNumber(F1NumEnd)+1); 10934cd4a484e532cc463fd5a4bf59b88d13c5467c1Evan Cheng // Strange exponential notation! 11034cd4a484e532cc463fd5a4bf59b88d13c5467c1Evan Cheng StrTmp[static_cast<unsigned>(F1NumEnd-F1P)] = 'e'; 111333ad3f2bf2941618f8e1563da022da011e615c0Michael J. Spencer 112a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner V1 = strtod(&StrTmp[0], const_cast<char**>(&F1NumEnd)); 113a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner F1NumEnd = F1P + (F1NumEnd-&StrTmp[0]); 114a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner } 115333ad3f2bf2941618f8e1563da022da011e615c0Michael J. Spencer 116a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner if (*F2NumEnd == 'D' || *F2NumEnd == 'd') { 117a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner // Copy string into tmp buffer to replace the 'D' with an 'e'. 118a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner SmallString<200> StrTmp(F2P, EndOfNumber(F2NumEnd)+1); 11934cd4a484e532cc463fd5a4bf59b88d13c5467c1Evan Cheng // Strange exponential notation! 12034cd4a484e532cc463fd5a4bf59b88d13c5467c1Evan Cheng StrTmp[static_cast<unsigned>(F2NumEnd-F2P)] = 'e'; 121333ad3f2bf2941618f8e1563da022da011e615c0Michael J. Spencer 122a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner V2 = strtod(&StrTmp[0], const_cast<char**>(&F2NumEnd)); 123a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner F2NumEnd = F2P + (F2NumEnd-&StrTmp[0]); 124a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner } 12544542539233acdaf1a72179cd38506478b432de9Chris Lattner } 12644542539233acdaf1a72179cd38506478b432de9Chris Lattner 12744542539233acdaf1a72179cd38506478b432de9Chris Lattner if (F1NumEnd == F1P || F2NumEnd == F2P) { 128bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer if (ErrorMsg) { 129bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer *ErrorMsg = "FP Comparison failed, not a numeric difference between '"; 130bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer *ErrorMsg += F1P[0]; 131bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer *ErrorMsg += "' and '"; 132bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer *ErrorMsg += F2P[0]; 133bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer *ErrorMsg += "'"; 134bfb8eaff7356543c7f59394c74a0229684dad222Reid Spencer } 13544542539233acdaf1a72179cd38506478b432de9Chris Lattner return true; 13644542539233acdaf1a72179cd38506478b432de9Chris Lattner } 13744542539233acdaf1a72179cd38506478b432de9Chris Lattner 13844542539233acdaf1a72179cd38506478b432de9Chris Lattner // Check to see if these are inside the absolute tolerance 13944542539233acdaf1a72179cd38506478b432de9Chris Lattner if (AbsTolerance < std::abs(V1-V2)) { 14044542539233acdaf1a72179cd38506478b432de9Chris Lattner // Nope, check the relative tolerance... 14144542539233acdaf1a72179cd38506478b432de9Chris Lattner double Diff; 14244542539233acdaf1a72179cd38506478b432de9Chris Lattner if (V2) 14344542539233acdaf1a72179cd38506478b432de9Chris Lattner Diff = std::abs(V1/V2 - 1.0); 14444542539233acdaf1a72179cd38506478b432de9Chris Lattner else if (V1) 14544542539233acdaf1a72179cd38506478b432de9Chris Lattner Diff = std::abs(V2/V1 - 1.0); 14644542539233acdaf1a72179cd38506478b432de9Chris Lattner else 14744542539233acdaf1a72179cd38506478b432de9Chris Lattner Diff = 0; // Both zero. 14844542539233acdaf1a72179cd38506478b432de9Chris Lattner if (Diff > RelTolerance) { 14944542539233acdaf1a72179cd38506478b432de9Chris Lattner if (ErrorMsg) { 1505908839cedfa4cfb3b7a89db01f987c47e64aa90Benjamin Kramer raw_string_ostream(*ErrorMsg) 1515908839cedfa4cfb3b7a89db01f987c47e64aa90Benjamin Kramer << "Compared: " << V1 << " and " << V2 << '\n' 1525908839cedfa4cfb3b7a89db01f987c47e64aa90Benjamin Kramer << "abs. diff = " << std::abs(V1-V2) << " rel.diff = " << Diff << '\n' 1535908839cedfa4cfb3b7a89db01f987c47e64aa90Benjamin Kramer << "Out of tolerance: rel/abs: " << RelTolerance << '/' 1545908839cedfa4cfb3b7a89db01f987c47e64aa90Benjamin Kramer << AbsTolerance; 15544542539233acdaf1a72179cd38506478b432de9Chris Lattner } 15644542539233acdaf1a72179cd38506478b432de9Chris Lattner return true; 15744542539233acdaf1a72179cd38506478b432de9Chris Lattner } 15844542539233acdaf1a72179cd38506478b432de9Chris Lattner } 15944542539233acdaf1a72179cd38506478b432de9Chris Lattner 16044542539233acdaf1a72179cd38506478b432de9Chris Lattner // Otherwise, advance our read pointers to the end of the numbers. 16144542539233acdaf1a72179cd38506478b432de9Chris Lattner F1P = F1NumEnd; F2P = F2NumEnd; 16244542539233acdaf1a72179cd38506478b432de9Chris Lattner return false; 16344542539233acdaf1a72179cd38506478b432de9Chris Lattner} 16444542539233acdaf1a72179cd38506478b432de9Chris Lattner 16544542539233acdaf1a72179cd38506478b432de9Chris Lattner/// DiffFilesWithTolerance - Compare the two files specified, returning 0 if the 16644542539233acdaf1a72179cd38506478b432de9Chris Lattner/// files match, 1 if they are different, and 2 if there is a file error. This 16744542539233acdaf1a72179cd38506478b432de9Chris Lattner/// function differs from DiffFiles in that you can specify an absolete and 16844542539233acdaf1a72179cd38506478b432de9Chris Lattner/// relative FP error that is allowed to exist. If you specify a string to fill 16944542539233acdaf1a72179cd38506478b432de9Chris Lattner/// in for the error option, it will set the string to an error message if an 17044542539233acdaf1a72179cd38506478b432de9Chris Lattner/// error occurs, allowing the caller to distinguish between a failed diff and a 17144542539233acdaf1a72179cd38506478b432de9Chris Lattner/// file system error. 17244542539233acdaf1a72179cd38506478b432de9Chris Lattner/// 173bbf97ea7d5832922b3c40b67701b5719bfcb772bRafael Espindolaint llvm::DiffFilesWithTolerance(StringRef NameA, 174bbf97ea7d5832922b3c40b67701b5719bfcb772bRafael Espindola StringRef NameB, 17544542539233acdaf1a72179cd38506478b432de9Chris Lattner double AbsTol, double RelTol, 17644542539233acdaf1a72179cd38506478b432de9Chris Lattner std::string *Error) { 1777a2bdde0a0eebcd2125055e0eacaca040f0b766cChris Lattner // Now its safe to mmap the files into memory because both files 17830493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // have a non-zero size. 179cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines ErrorOr<std::unique_ptr<MemoryBuffer>> F1OrErr = MemoryBuffer::getFile(NameA); 180cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines if (std::error_code EC = F1OrErr.getError()) { 181333fb04506233255f10d8095c9e2de5e5f0fdc6fMichael J. Spencer if (Error) 182cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines *Error = EC.message(); 183333fb04506233255f10d8095c9e2de5e5f0fdc6fMichael J. Spencer return 2; 184333fb04506233255f10d8095c9e2de5e5f0fdc6fMichael J. Spencer } 185cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines std::unique_ptr<MemoryBuffer> F1 = std::move(F1OrErr.get()); 186cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines 187cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines ErrorOr<std::unique_ptr<MemoryBuffer>> F2OrErr = MemoryBuffer::getFile(NameB); 188cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines if (std::error_code EC = F2OrErr.getError()) { 189333fb04506233255f10d8095c9e2de5e5f0fdc6fMichael J. Spencer if (Error) 190cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines *Error = EC.message(); 19130493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer return 2; 192333fb04506233255f10d8095c9e2de5e5f0fdc6fMichael J. Spencer } 193cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines std::unique_ptr<MemoryBuffer> F2 = std::move(F2OrErr.get()); 194333fb04506233255f10d8095c9e2de5e5f0fdc6fMichael J. Spencer 19530493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Okay, now that we opened the files, scan them for the first difference. 196a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner const char *File1Start = F1->getBufferStart(); 197a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner const char *File2Start = F2->getBufferStart(); 198a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner const char *File1End = F1->getBufferEnd(); 199a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner const char *File2End = F2->getBufferEnd(); 200a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner const char *F1P = File1Start; 201a7750c1142baa5ad812d5209526a0b6568201e0eChris Lattner const char *F2P = File2Start; 2026a3c89846f242b61236155e0e7100850327a222dRafael Espindola uint64_t A_size = F1->getBufferSize(); 2036a3c89846f242b61236155e0e7100850327a222dRafael Espindola uint64_t B_size = F2->getBufferSize(); 20430493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer 20571907fbebf5a812b9a117574b196d8ff9561ac75Daniel Dunbar // Are the buffers identical? Common case: Handle this efficiently. 20671907fbebf5a812b9a117574b196d8ff9561ac75Daniel Dunbar if (A_size == B_size && 20771907fbebf5a812b9a117574b196d8ff9561ac75Daniel Dunbar std::memcmp(File1Start, File2Start, A_size) == 0) 20871907fbebf5a812b9a117574b196d8ff9561ac75Daniel Dunbar return 0; 20971907fbebf5a812b9a117574b196d8ff9561ac75Daniel Dunbar 21071907fbebf5a812b9a117574b196d8ff9561ac75Daniel Dunbar // Otherwise, we are done a tolerances are set. 21171907fbebf5a812b9a117574b196d8ff9561ac75Daniel Dunbar if (AbsTol == 0 && RelTol == 0) { 21271907fbebf5a812b9a117574b196d8ff9561ac75Daniel Dunbar if (Error) 21371907fbebf5a812b9a117574b196d8ff9561ac75Daniel Dunbar *Error = "Files differ without tolerance allowance"; 21471907fbebf5a812b9a117574b196d8ff9561ac75Daniel Dunbar return 1; // Files different! 21530493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer } 21644542539233acdaf1a72179cd38506478b432de9Chris Lattner 21730493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer bool CompareFailed = false; 21830493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer while (1) { 21930493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Scan for the end of file or next difference. 22030493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer while (F1P < File1End && F2P < File2End && *F1P == *F2P) 22130493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer ++F1P, ++F2P; 22244542539233acdaf1a72179cd38506478b432de9Chris Lattner 22330493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (F1P >= File1End || F2P >= File2End) break; 22444542539233acdaf1a72179cd38506478b432de9Chris Lattner 22530493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Okay, we must have found a difference. Backup to the start of the 22630493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // current number each stream is at so that we can compare from the 22730493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // beginning. 22830493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer F1P = BackupNumber(F1P, File1Start); 22930493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer F2P = BackupNumber(F2P, File2Start); 23044542539233acdaf1a72179cd38506478b432de9Chris Lattner 23130493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Now that we are at the start of the numbers, compare them, exiting if 23230493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // they don't match. 23330493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (CompareNumbers(F1P, F2P, File1End, File2End, AbsTol, RelTol, Error)) { 23430493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer CompareFailed = true; 23530493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer break; 23644542539233acdaf1a72179cd38506478b432de9Chris Lattner } 23730493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer } 23844542539233acdaf1a72179cd38506478b432de9Chris Lattner 23930493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Okay, we reached the end of file. If both files are at the end, we 24030493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // succeeded. 24130493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer bool F1AtEnd = F1P >= File1End; 24230493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer bool F2AtEnd = F2P >= File2End; 24330493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (!CompareFailed && (!F1AtEnd || !F2AtEnd)) { 24430493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Else, we might have run off the end due to a number: backup and retry. 24530493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (F1AtEnd && isNumberChar(F1P[-1])) --F1P; 24630493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (F2AtEnd && isNumberChar(F2P[-1])) --F2P; 24730493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer F1P = BackupNumber(F1P, File1Start); 24830493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer F2P = BackupNumber(F2P, File2Start); 24930493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer 25030493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // Now that we are at the start of the numbers, compare them, exiting if 25130493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // they don't match. 25230493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (CompareNumbers(F1P, F2P, File1End, File2End, AbsTol, RelTol, Error)) 25330493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer CompareFailed = true; 25430493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer 25530493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer // If we found the end, we succeeded. 25630493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer if (F1P < File1End || F2P < File2End) 25730493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer CompareFailed = true; 25844542539233acdaf1a72179cd38506478b432de9Chris Lattner } 25930493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer 26030493372f3d403c9637eb479e7d0c4388b715c41Reid Spencer return CompareFailed; 26144542539233acdaf1a72179cd38506478b432de9Chris Lattner} 262