| 1 | /* $Id: RTCat.cpp 99775 2023-05-12 12:21:58Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - cat like utility.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2017-2023 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * The contents of this file may alternatively be used under the terms
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| 26 | * of the Common Development and Distribution License Version 1.0
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| 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | * in the VirtualBox distribution, in which case the provisions of the
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| 29 | * CDDL are applicable instead of those of the GPL.
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| 30 | *
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| 31 | * You may elect to license modified versions of this file under the
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| 32 | * terms and conditions of either the GPL or the CDDL or both.
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| 33 | *
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| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | */
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| 36 |
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| 37 |
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| 38 | /*********************************************************************************************************************************
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| 39 | * Header Files *
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| 40 | *********************************************************************************************************************************/
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| 41 | #include <iprt/vfs.h>
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| 42 |
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| 43 | #include <iprt/buildconfig.h>
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| 44 | #include <iprt/errcore.h>
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| 45 | #include <iprt/file.h>
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| 46 | #include <iprt/getopt.h>
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| 47 | #include <iprt/initterm.h>
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| 48 | #include <iprt/message.h>
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| 49 | #include <iprt/param.h>
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| 50 | #include <iprt/path.h>
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| 51 | #include <iprt/stream.h>
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| 52 | #include <iprt/string.h>
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| 53 |
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| 54 |
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| 55 | /*********************************************************************************************************************************
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| 56 | * Structures and Typedefs *
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| 57 | *********************************************************************************************************************************/
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| 58 | /**
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| 59 | * CAT command options.
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| 60 | */
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| 61 | typedef struct RTCMDCATOPTS
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| 62 | {
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| 63 | bool fShowEnds; /**< -E */
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| 64 | bool fShowNonPrinting; /**< -v */
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| 65 | bool fShowTabs; /**< -T */
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| 66 | bool fSqueezeBlankLines; /**< -s */
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| 67 | bool fNumberLines; /**< -n */
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| 68 | bool fNumberNonBlankLines; /**< -b */
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| 69 | bool fAdvisoryOutputLock; /**< -l */
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| 70 | bool fUnbufferedOutput; /**< -u */
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| 71 | } RTCMDCATOPTS;
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| 72 | /** Pointer to const CAT options. */
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| 73 | typedef RTCMDCATOPTS const *PCRTCMDCATOPTS;
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| 74 |
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| 75 |
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| 76 |
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| 77 | /**
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| 78 | * Outputs the source raw.
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| 79 | *
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| 80 | * @returns Command exit, error messages written using RTMsg*.
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| 81 | * @param hVfsOutput The output I/O stream.
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| 82 | * @param hVfsSrc The input I/O stream.
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| 83 | * @param pszSrc The input name.
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| 84 | */
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| 85 | static RTEXITCODE rtCmdCatShowRaw(RTVFSIOSTREAM hVfsOutput, RTVFSIOSTREAM hVfsSrc, const char *pszSrc)
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| 86 | {
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| 87 | int rc = RTVfsUtilPumpIoStreams(hVfsSrc, hVfsOutput, 0 /*cbBufHint*/);
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| 88 | if (RT_SUCCESS(rc))
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| 89 | return RTEXITCODE_SUCCESS;
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| 90 | return RTMsgErrorExitFailure("Error catting '%s': %Rrc", pszSrc, rc);
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| 91 | }
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| 92 |
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| 93 |
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| 94 | /**
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| 95 | * Outputs the source with complicated formatting.
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| 96 | *
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| 97 | * @returns Command exit, error messages written using RTMsg*.
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| 98 | * @param hVfsOutput The output I/O stream.
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| 99 | * @param hVfsSrc The input I/O stream.
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| 100 | * @param pszSrc The input name.
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| 101 | */
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| 102 | static RTEXITCODE rtCmdCatShowComplicated(RTVFSIOSTREAM hVfsOutput, RTVFSIOSTREAM hVfsSrc, const char *pszSrc,
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| 103 | PCRTCMDCATOPTS pOpts)
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| 104 | {
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| 105 | if (pOpts->fShowEnds)
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| 106 | RTMsgWarning("--show-ends is not implemented\n");
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| 107 | if (pOpts->fShowTabs)
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| 108 | RTMsgWarning("--show-tabs is not implemented\n");
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| 109 | if (pOpts->fShowNonPrinting)
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| 110 | RTMsgWarning("--show-nonprinting is not implemented\n");
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| 111 | if (pOpts->fSqueezeBlankLines)
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| 112 | RTMsgWarning("--squeeze-blank is not implemented\n");
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| 113 | if (pOpts->fNumberLines)
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| 114 | RTMsgWarning("--number is not implemented\n");
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| 115 | if (pOpts->fNumberNonBlankLines)
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| 116 | RTMsgWarning("--number-nonblank is not implemented\n");
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| 117 | return rtCmdCatShowRaw(hVfsOutput, hVfsSrc, pszSrc);
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| 118 | }
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| 119 |
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| 120 |
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| 121 | /**
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| 122 | * Opens the input file.
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| 123 | *
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| 124 | * @returns Command exit, error messages written using RTMsg*.
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| 125 | *
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| 126 | * @param pszFile The input filename.
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| 127 | * @param phVfsIos Where to return the input stream handle.
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| 128 | */
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| 129 | static RTEXITCODE rtCmdCatOpenInput(const char *pszFile, PRTVFSIOSTREAM phVfsIos)
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| 130 | {
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| 131 | int rc;
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| 132 |
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| 133 | if (!strcmp(pszFile, "-"))
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| 134 | {
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| 135 | rc = RTVfsIoStrmFromStdHandle(RTHANDLESTD_INPUT,
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| 136 | RTFILE_O_READ | RTFILE_O_OPEN | RTFILE_O_DENY_NONE,
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| 137 | true /*fLeaveOpen*/,
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| 138 | phVfsIos);
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| 139 | if (RT_FAILURE(rc))
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| 140 | return RTMsgErrorExitFailure("Error opening standard input: %Rrc", rc);
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| 141 | }
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| 142 | else
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| 143 | {
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| 144 | uint32_t offError = 0;
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| 145 | RTERRINFOSTATIC ErrInfo;
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| 146 | rc = RTVfsChainOpenIoStream(pszFile, RTFILE_O_READ | RTFILE_O_OPEN | RTFILE_O_DENY_NONE,
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| 147 | phVfsIos, &offError, RTErrInfoInitStatic(&ErrInfo));
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| 148 | if (RT_FAILURE(rc))
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| 149 | return RTVfsChainMsgErrorExitFailure("RTVfsChainOpenIoStream", pszFile, rc, offError, &ErrInfo.Core);
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| 150 | }
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| 151 |
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| 152 | return RTEXITCODE_SUCCESS;
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| 153 |
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| 154 | }
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| 155 |
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| 156 |
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| 157 | /**
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| 158 | * A /bin/cat clone.
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| 159 | *
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| 160 | * @returns Program exit code.
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| 161 | *
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| 162 | * @param cArgs The number of arguments.
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| 163 | * @param papszArgs The argument vector. (Note that this may be
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| 164 | * reordered, so the memory must be writable.)
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| 165 | */
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| 166 | static RTEXITCODE RTCmdCat(unsigned cArgs, char **papszArgs)
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| 167 | {
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| 168 |
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| 169 | /*
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| 170 | * Parse the command line.
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| 171 | */
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| 172 | static const RTGETOPTDEF s_aOptions[] =
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| 173 | {
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| 174 | { "--show-all", 'A', RTGETOPT_REQ_NOTHING },
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| 175 | { "--number-nonblanks", 'b', RTGETOPT_REQ_NOTHING },
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| 176 | { "--show-ends-and-nonprinting", 'e', RTGETOPT_REQ_NOTHING },
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| 177 | { "--show-ends", 'E', RTGETOPT_REQ_NOTHING },
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| 178 | { "--advisory-output-lock", 'l', RTGETOPT_REQ_NOTHING },
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| 179 | { "--number", 'n', RTGETOPT_REQ_NOTHING },
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| 180 | { "--squeeze-blank", 's', RTGETOPT_REQ_NOTHING },
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| 181 | { "--show-tabs-and-nonprinting", 't', RTGETOPT_REQ_NOTHING },
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| 182 | { "--show-tabs", 'T', RTGETOPT_REQ_NOTHING },
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| 183 | { "--unbuffered-output", 'u', RTGETOPT_REQ_NOTHING },
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| 184 | { "--show-nonprinting", 'v', RTGETOPT_REQ_NOTHING },
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| 185 | };
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| 186 |
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| 187 | RTCMDCATOPTS Opts;
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| 188 | Opts.fShowEnds = false;
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| 189 | Opts.fShowNonPrinting = false;
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| 190 | Opts.fShowTabs = false;
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| 191 | Opts.fSqueezeBlankLines = false;
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| 192 | Opts.fNumberLines = false;
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| 193 | Opts.fNumberNonBlankLines = false;
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| 194 | Opts.fAdvisoryOutputLock = false;
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| 195 | Opts.fUnbufferedOutput = false;
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| 196 |
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| 197 | RTEXITCODE rcExit = RTEXITCODE_SUCCESS;
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| 198 | unsigned cProcessed = 0;
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| 199 | RTVFSIOSTREAM hVfsOutput = NIL_RTVFSIOSTREAM;
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| 200 | int rc = RTVfsIoStrmFromStdHandle(RTHANDLESTD_OUTPUT, RTFILE_O_WRITE | RTFILE_O_OPEN | RTFILE_O_DENY_NONE,
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| 201 | true /*fLeaveOpen*/, &hVfsOutput);
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| 202 | if (RT_FAILURE(rc))
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| 203 | return RTMsgErrorExitFailure("RTVfsIoStrmFromStdHandle: %Rrc", rc);
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| 204 |
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| 205 | RTGETOPTSTATE GetState;
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| 206 | rc = RTGetOptInit(&GetState, cArgs, papszArgs, s_aOptions, RT_ELEMENTS(s_aOptions), 1,
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| 207 | RTGETOPTINIT_FLAGS_OPTS_FIRST);
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| 208 | if (RT_SUCCESS(rc))
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| 209 | {
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| 210 | bool fContinue = true;
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| 211 | do
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| 212 | {
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| 213 | RTGETOPTUNION ValueUnion;
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| 214 | int chOpt = RTGetOpt(&GetState, &ValueUnion);
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| 215 | switch (chOpt)
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| 216 | {
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| 217 | case 0:
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| 218 | /*
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| 219 | * If we've processed any files we're done. Otherwise take
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| 220 | * input from stdin and write the output to stdout.
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| 221 | */
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| 222 | if (cProcessed > 0)
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| 223 | {
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| 224 | fContinue = false;
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| 225 | break;
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| 226 | }
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| 227 | ValueUnion.psz = "-";
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| 228 | RT_FALL_THRU();
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| 229 | case VINF_GETOPT_NOT_OPTION:
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| 230 | {
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| 231 | RTVFSIOSTREAM hVfsSrc;
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| 232 | RTEXITCODE rcExit2 = rtCmdCatOpenInput(ValueUnion.psz, &hVfsSrc);
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| 233 | if (rcExit2 == RTEXITCODE_SUCCESS)
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| 234 | {
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| 235 | if ( Opts.fShowEnds
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| 236 | || Opts.fShowTabs
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| 237 | || Opts.fShowNonPrinting
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| 238 | || Opts.fSqueezeBlankLines
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| 239 | || Opts.fNumberLines
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| 240 | || Opts.fNumberNonBlankLines)
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| 241 | rcExit2 = rtCmdCatShowComplicated(hVfsOutput, hVfsSrc, ValueUnion.psz, &Opts);
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| 242 | else
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| 243 | rcExit2 = rtCmdCatShowRaw(hVfsOutput, hVfsSrc, ValueUnion.psz);
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| 244 | RTVfsIoStrmRelease(hVfsSrc);
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| 245 | }
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| 246 | if (rcExit2 != RTEXITCODE_SUCCESS)
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| 247 | rcExit = rcExit2;
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| 248 | cProcessed++;
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| 249 | break;
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| 250 | }
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| 251 |
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| 252 | case 'A':
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| 253 | Opts.fShowNonPrinting = true;
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| 254 | Opts.fShowEnds = true;
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| 255 | Opts.fShowTabs = true;
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| 256 | break;
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| 257 |
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| 258 | case 'b':
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| 259 | Opts.fNumberNonBlankLines = true;
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| 260 | break;
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| 261 |
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| 262 | case 'e':
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| 263 | Opts.fShowNonPrinting = true;
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| 264 | RT_FALL_THRU();
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| 265 | case 'E':
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| 266 | Opts.fShowEnds = true;
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| 267 | break;
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| 268 |
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| 269 | case 'l':
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| 270 | Opts.fAdvisoryOutputLock = true;
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| 271 | break;
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| 272 |
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| 273 | case 'n':
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| 274 | Opts.fNumberLines = true;
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| 275 | Opts.fNumberNonBlankLines = false;
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| 276 | break;
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| 277 |
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| 278 | case 's':
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| 279 | Opts.fSqueezeBlankLines = true;
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| 280 | break;
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| 281 |
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| 282 | case 't':
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| 283 | Opts.fShowNonPrinting = true;
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| 284 | RT_FALL_THRU();
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| 285 | case 'T':
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| 286 | Opts.fShowTabs = true;
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| 287 | break;
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| 288 |
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| 289 | case 'u': /* currently ignored */
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| 290 | Opts.fUnbufferedOutput = true;
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| 291 | break;
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| 292 |
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| 293 | case 'v':
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| 294 | Opts.fShowNonPrinting = true;
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| 295 | break;
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| 296 |
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| 297 | case 'h':
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| 298 | RTPrintf("Usage: to be written\nOption dump:\n");
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| 299 | for (unsigned i = 0; i < RT_ELEMENTS(s_aOptions); i++)
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| 300 | RTPrintf(" -%c,%s\n", s_aOptions[i].iShort, s_aOptions[i].pszLong);
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| 301 | fContinue = false;
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| 302 | break;
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| 303 |
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| 304 | case 'V':
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| 305 | RTPrintf("%sr%d\n", RTBldCfgVersion(), RTBldCfgRevision());
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| 306 | fContinue = false;
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| 307 | break;
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| 308 |
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| 309 | default:
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| 310 | rcExit = RTGetOptPrintError(chOpt, &ValueUnion);
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| 311 | fContinue = false;
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| 312 | break;
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| 313 | }
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| 314 | } while (fContinue);
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| 315 | }
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| 316 | else
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| 317 | rcExit = RTMsgErrorExit(RTEXITCODE_SYNTAX, "RTGetOptInit: %Rrc", rc);
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| 318 | RTVfsIoStrmRelease(hVfsOutput);
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| 319 | return rcExit;
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| 320 | }
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| 321 |
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| 322 |
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| 323 | int main(int argc, char **argv)
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| 324 | {
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| 325 | int rc = RTR3InitExe(argc, &argv, 0);
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| 326 | if (RT_FAILURE(rc))
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| 327 | return RTMsgInitFailure(rc);
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| 328 | return RTCmdCat(argc, argv);
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| 329 | }
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| 330 |
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