1 //===- AutoConvert.cpp - Auto conversion between ASCII/EBCDIC -------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file contains functions used for auto conversion between
10 // ASCII/EBCDIC codepages specific to z/OS.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #ifdef __MVS__
15
16 #include "llvm/Support/AutoConvert.h"
17 #include <fcntl.h>
18 #include <sys/stat.h>
19
disableAutoConversion(int FD)20 std::error_code llvm::disableAutoConversion(int FD) {
21 static const struct f_cnvrt Convert = {
22 SETCVTOFF, // cvtcmd
23 0, // pccsid
24 (short)FT_BINARY, // fccsid
25 };
26 if (fcntl(FD, F_CONTROL_CVT, &Convert) == -1)
27 return std::error_code(errno, std::generic_category());
28 return std::error_code();
29 }
30
enableAutoConversion(int FD)31 std::error_code llvm::enableAutoConversion(int FD) {
32 struct f_cnvrt Query = {
33 QUERYCVT, // cvtcmd
34 0, // pccsid
35 0, // fccsid
36 };
37
38 if (fcntl(FD, F_CONTROL_CVT, &Query) == -1)
39 return std::error_code(errno, std::generic_category());
40
41 Query.cvtcmd = SETCVTALL;
42 Query.pccsid =
43 (FD == STDIN_FILENO || FD == STDOUT_FILENO || FD == STDERR_FILENO)
44 ? 0
45 : CCSID_UTF_8;
46 // Assume untagged files to be IBM-1047 encoded.
47 Query.fccsid = (Query.fccsid == FT_UNTAGGED) ? CCSID_IBM_1047 : Query.fccsid;
48 if (fcntl(FD, F_CONTROL_CVT, &Query) == -1)
49 return std::error_code(errno, std::generic_category());
50 return std::error_code();
51 }
52
setFileTag(int FD,int CCSID,bool Text)53 std::error_code llvm::setFileTag(int FD, int CCSID, bool Text) {
54 assert((!Text || (CCSID != FT_UNTAGGED && CCSID != FT_BINARY)) &&
55 "FT_UNTAGGED and FT_BINARY are not allowed for text files");
56 struct file_tag Tag;
57 Tag.ft_ccsid = CCSID;
58 Tag.ft_txtflag = Text;
59 Tag.ft_deferred = 0;
60 Tag.ft_rsvflags = 0;
61
62 if (fcntl(FD, F_SETTAG, &Tag) == -1)
63 return std::error_code(errno, std::generic_category());
64 return std::error_code();
65 }
66
67 #endif // __MVS__
68