ba13fa2a5d
LLVM is inconsistent about how it converts `errno` to `std::error_code`. This can cause problems because values outside of `std::errc` compare differently if one is system and one is generic on POSIX systems. This is even more of a problem on Windows where use of the system category is just wrong, as that is for Windows errors, which have a completely different mapping than POSIX/generic errors. This patch fixes one instance of this mistake in `JSONTransport.cpp`. This patch adds `errnoAsErrorCode()` which makes it so people do not need to think about this issue in the future. It also cleans up a lot of usage of `errno` in LLVM and Clang.
119 lines
3.5 KiB
C++
119 lines
3.5 KiB
C++
//===- AutoConvert.cpp - Auto conversion between ASCII/EBCDIC -------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains functions used for auto conversion between
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// ASCII/EBCDIC codepages specific to z/OS.
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//
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//===----------------------------------------------------------------------===//
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#ifdef __MVS__
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#include "llvm/Support/AutoConvert.h"
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#include <cassert>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <unistd.h>
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static int savedStdHandleAutoConversionMode[3] = {-1, -1, -1};
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int disableAutoConversion(int FD) {
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static const struct f_cnvrt Convert = {
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SETCVTOFF, // cvtcmd
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0, // pccsid
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0, // fccsid
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};
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return fcntl(FD, F_CONTROL_CVT, &Convert);
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}
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int restoreStdHandleAutoConversion(int FD) {
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assert(FD == STDIN_FILENO || FD == STDOUT_FILENO || FD == STDERR_FILENO);
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if (savedStdHandleAutoConversionMode[FD] == -1)
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return 0;
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struct f_cnvrt Cvt = {
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savedStdHandleAutoConversionMode[FD], // cvtcmd
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0, // pccsid
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0, // fccsid
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};
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return (fcntl(FD, F_CONTROL_CVT, &Cvt));
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}
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int enableAutoConversion(int FD) {
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struct f_cnvrt Query = {
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QUERYCVT, // cvtcmd
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0, // pccsid
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0, // fccsid
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};
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if (fcntl(FD, F_CONTROL_CVT, &Query) == -1)
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return -1;
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// We don't need conversion for UTF-8 tagged files.
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// TODO: Remove the assumption of ISO8859-1 = UTF-8 here when we fully resolve
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// problems related to UTF-8 tagged source files.
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// When the pccsid is not ISO8859-1, autoconversion is still needed.
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if (Query.pccsid == CCSID_ISO8859_1 &&
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(Query.fccsid == CCSID_UTF_8 || Query.fccsid == CCSID_ISO8859_1))
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return 0;
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// Save the state of std handles before we make changes to it.
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if ((FD == STDIN_FILENO || FD == STDOUT_FILENO || FD == STDERR_FILENO) &&
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savedStdHandleAutoConversionMode[FD] == -1)
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savedStdHandleAutoConversionMode[FD] = Query.cvtcmd;
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if (FD == STDOUT_FILENO || FD == STDERR_FILENO)
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Query.cvtcmd = SETCVTON;
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else
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Query.cvtcmd = SETCVTALL;
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Query.pccsid =
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(FD == STDIN_FILENO || FD == STDOUT_FILENO || FD == STDERR_FILENO)
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? 0
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: CCSID_UTF_8;
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// Assume untagged files to be IBM-1047 encoded.
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Query.fccsid = (Query.fccsid == FT_UNTAGGED) ? CCSID_IBM_1047 : Query.fccsid;
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return fcntl(FD, F_CONTROL_CVT, &Query);
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}
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std::error_code llvm::disableAutoConversion(int FD) {
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if (::disableAutoConversion(FD) == -1)
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return errnoAsErrorCode();
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return std::error_code();
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}
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std::error_code llvm::enableAutoConversion(int FD) {
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if (::enableAutoConversion(FD) == -1)
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return errnoAsErrorCode();
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return std::error_code();
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}
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std::error_code llvm::restoreStdHandleAutoConversion(int FD) {
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if (::restoreStdHandleAutoConversion(FD) == -1)
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return errnoAsErrorCode();
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return std::error_code();
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}
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std::error_code llvm::setFileTag(int FD, int CCSID, bool Text) {
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assert((!Text || (CCSID != FT_UNTAGGED && CCSID != FT_BINARY)) &&
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"FT_UNTAGGED and FT_BINARY are not allowed for text files");
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struct file_tag Tag;
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Tag.ft_ccsid = CCSID;
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Tag.ft_txtflag = Text;
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Tag.ft_deferred = 0;
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Tag.ft_rsvflags = 0;
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if (fcntl(FD, F_SETTAG, &Tag) == -1)
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return errnoAsErrorCode();
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return std::error_code();
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}
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#endif // __MVS__
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