22fd11fe66
This AutoConvert.h header frequently gets mislabeled as an unused include because it is guarded by MVS internally and every usage is also guarded. This refactors the change to remove this guard and instead make these functions a noop on other non-z/OS platforms.
137 lines
4.2 KiB
C++
137 lines
4.2 KiB
C++
//===- AutoConvert.cpp - Auto conversion between ASCII/EBCDIC -------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file contains functions used for auto conversion between
|
|
// ASCII/EBCDIC codepages specific to z/OS.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifdef __MVS__
|
|
|
|
#include "llvm/Support/AutoConvert.h"
|
|
#include "llvm/Support/Error.h"
|
|
#include <cassert>
|
|
#include <fcntl.h>
|
|
#include <sys/stat.h>
|
|
#include <unistd.h>
|
|
|
|
using namespace llvm;
|
|
|
|
static int savedStdHandleAutoConversionMode[3] = {-1, -1, -1};
|
|
|
|
int disablezOSAutoConversion(int FD) {
|
|
static const struct f_cnvrt Convert = {
|
|
SETCVTOFF, // cvtcmd
|
|
0, // pccsid
|
|
0, // fccsid
|
|
};
|
|
|
|
return fcntl(FD, F_CONTROL_CVT, &Convert);
|
|
}
|
|
|
|
int restorezOSStdHandleAutoConversion(int FD) {
|
|
assert(FD == STDIN_FILENO || FD == STDOUT_FILENO || FD == STDERR_FILENO);
|
|
if (savedStdHandleAutoConversionMode[FD] == -1)
|
|
return 0;
|
|
struct f_cnvrt Cvt = {
|
|
savedStdHandleAutoConversionMode[FD], // cvtcmd
|
|
0, // pccsid
|
|
0, // fccsid
|
|
};
|
|
return (fcntl(FD, F_CONTROL_CVT, &Cvt));
|
|
}
|
|
|
|
int enablezOSAutoConversion(int FD) {
|
|
struct f_cnvrt Query = {
|
|
QUERYCVT, // cvtcmd
|
|
0, // pccsid
|
|
0, // fccsid
|
|
};
|
|
|
|
if (fcntl(FD, F_CONTROL_CVT, &Query) == -1)
|
|
return -1;
|
|
|
|
// We don't need conversion for UTF-8 tagged files.
|
|
// TODO: Remove the assumption of ISO8859-1 = UTF-8 here when we fully resolve
|
|
// problems related to UTF-8 tagged source files.
|
|
// When the pccsid is not ISO8859-1, autoconversion is still needed.
|
|
if (Query.pccsid == CCSID_ISO8859_1 &&
|
|
(Query.fccsid == CCSID_UTF_8 || Query.fccsid == CCSID_ISO8859_1))
|
|
return 0;
|
|
|
|
// Save the state of std handles before we make changes to it.
|
|
if ((FD == STDIN_FILENO || FD == STDOUT_FILENO || FD == STDERR_FILENO) &&
|
|
savedStdHandleAutoConversionMode[FD] == -1)
|
|
savedStdHandleAutoConversionMode[FD] = Query.cvtcmd;
|
|
|
|
if (FD == STDOUT_FILENO || FD == STDERR_FILENO)
|
|
Query.cvtcmd = SETCVTON;
|
|
else
|
|
Query.cvtcmd = SETCVTALL;
|
|
|
|
Query.pccsid =
|
|
(FD == STDIN_FILENO || FD == STDOUT_FILENO || FD == STDERR_FILENO)
|
|
? 0
|
|
: CCSID_UTF_8;
|
|
// Assume untagged files to be IBM-1047 encoded.
|
|
Query.fccsid = (Query.fccsid == FT_UNTAGGED) ? CCSID_IBM_1047 : Query.fccsid;
|
|
return fcntl(FD, F_CONTROL_CVT, &Query);
|
|
}
|
|
|
|
std::error_code llvm::setzOSFileTag(int FD, int CCSID, bool Text) {
|
|
assert((!Text || (CCSID != FT_UNTAGGED && CCSID != FT_BINARY)) &&
|
|
"FT_UNTAGGED and FT_BINARY are not allowed for text files");
|
|
struct file_tag Tag;
|
|
Tag.ft_ccsid = CCSID;
|
|
Tag.ft_txtflag = Text;
|
|
Tag.ft_deferred = 0;
|
|
Tag.ft_rsvflags = 0;
|
|
|
|
if (fcntl(FD, F_SETTAG, &Tag) == -1)
|
|
return errnoAsErrorCode();
|
|
return std::error_code();
|
|
}
|
|
|
|
ErrorOr<__ccsid_t> llvm::getzOSFileTag(const char *FileName, const int FD) {
|
|
// If we have a file descriptor, use it to find out file tagging. Otherwise we
|
|
// need to use stat() with the file path.
|
|
if (FD != -1) {
|
|
struct f_cnvrt Query = {
|
|
QUERYCVT, // cvtcmd
|
|
0, // pccsid
|
|
0, // fccsid
|
|
};
|
|
if (fcntl(FD, F_CONTROL_CVT, &Query) == -1)
|
|
return std::error_code(errno, std::generic_category());
|
|
return Query.fccsid;
|
|
}
|
|
struct stat Attr;
|
|
if (stat(FileName, &Attr) == -1)
|
|
return std::error_code(errno, std::generic_category());
|
|
return Attr.st_tag.ft_ccsid;
|
|
}
|
|
|
|
ErrorOr<bool> llvm::needzOSConversion(const char *FileName, const int FD) {
|
|
ErrorOr<__ccsid_t> Ccsid = getzOSFileTag(FileName, FD);
|
|
if (std::error_code EC = Ccsid.getError())
|
|
return EC;
|
|
// We don't need conversion for UTF-8 tagged files or binary files.
|
|
// TODO: Remove the assumption of ISO8859-1 = UTF-8 here when we fully resolve
|
|
// problems related to UTF-8 tagged source files.
|
|
switch (*Ccsid) {
|
|
case CCSID_UTF_8:
|
|
case CCSID_ISO8859_1:
|
|
case FT_BINARY:
|
|
return false;
|
|
default:
|
|
return true;
|
|
}
|
|
}
|
|
|
|
#endif //__MVS__
|