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//===- 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 <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__
|
