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/* $Id: RTCat.cpp $ */
/** @file
* IPRT - cat like utility.
*/
/*
* Copyright (C) 2017-2020 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include <iprt/vfs.h>
#include <iprt/buildconfig.h>
#include <iprt/errcore.h>
#include <iprt/file.h>
#include <iprt/getopt.h>
#include <iprt/initterm.h>
#include <iprt/message.h>
#include <iprt/param.h>
#include <iprt/path.h>
#include <iprt/stream.h>
#include <iprt/string.h>
/*********************************************************************************************************************************
* Structures and Typedefs *
*********************************************************************************************************************************/
/**
* CAT command options.
*/
typedef struct RTCMDCATOPTS
{
bool fShowEnds; /**< -E */
bool fShowNonPrinting; /**< -v */
bool fShowTabs; /**< -T */
bool fSqueezeBlankLines; /**< -s */
bool fNumberLines; /**< -n */
bool fNumberNonBlankLines; /**< -b */
bool fAdvisoryOutputLock; /**< -l */
bool fUnbufferedOutput; /**< -u */
} RTCMDCATOPTS;
/** Pointer to const CAT options. */
typedef RTCMDCATOPTS const *PCRTCMDCATOPTS;
/**
* Outputs the source raw.
*
* @returns Command exit, error messages written using RTMsg*.
* @param hVfsOutput The output I/O stream.
* @param hVfsSrc The input I/O stream.
* @param pszSrc The input name.
*/
static RTEXITCODE rtCmdCatShowRaw(RTVFSIOSTREAM hVfsOutput, RTVFSIOSTREAM hVfsSrc, const char *pszSrc)
{
int rc = RTVfsUtilPumpIoStreams(hVfsSrc, hVfsOutput, 0 /*cbBufHint*/);
if (RT_SUCCESS(rc))
return RTEXITCODE_SUCCESS;
return RTMsgErrorExitFailure("Error catting '%s': %Rrc", pszSrc, rc);
}
/**
* Outputs the source with complicated formatting.
*
* @returns Command exit, error messages written using RTMsg*.
* @param hVfsOutput The output I/O stream.
* @param hVfsSrc The input I/O stream.
* @param pszSrc The input name.
*/
static RTEXITCODE rtCmdCatShowComplicated(RTVFSIOSTREAM hVfsOutput, RTVFSIOSTREAM hVfsSrc, const char *pszSrc,
PCRTCMDCATOPTS pOpts)
{
if (pOpts->fShowEnds)
RTMsgWarning("--show-ends is not implemented\n");
if (pOpts->fShowTabs)
RTMsgWarning("--show-tabs is not implemented\n");
if (pOpts->fShowNonPrinting)
RTMsgWarning("--show-nonprinting is not implemented\n");
if (pOpts->fSqueezeBlankLines)
RTMsgWarning("--squeeze-blank is not implemented\n");
if (pOpts->fNumberLines)
RTMsgWarning("--number is not implemented\n");
if (pOpts->fNumberNonBlankLines)
RTMsgWarning("--number-nonblank is not implemented\n");
return rtCmdCatShowRaw(hVfsOutput, hVfsSrc, pszSrc);
}
/**
* Opens the input file.
*
* @returns Command exit, error messages written using RTMsg*.
*
* @param pszFile The input filename.
* @param phVfsIos Where to return the input stream handle.
*/
static RTEXITCODE rtCmdCatOpenInput(const char *pszFile, PRTVFSIOSTREAM phVfsIos)
{
int rc;
if (!strcmp(pszFile, "-"))
{
rc = RTVfsIoStrmFromStdHandle(RTHANDLESTD_INPUT,
RTFILE_O_READ | RTFILE_O_OPEN | RTFILE_O_DENY_NONE,
true /*fLeaveOpen*/,
phVfsIos);
if (RT_FAILURE(rc))
return RTMsgErrorExitFailure("Error opening standard input: %Rrc", rc);
}
else
{
uint32_t offError = 0;
RTERRINFOSTATIC ErrInfo;
rc = RTVfsChainOpenIoStream(pszFile, RTFILE_O_READ | RTFILE_O_OPEN | RTFILE_O_DENY_NONE,
phVfsIos, &offError, RTErrInfoInitStatic(&ErrInfo));
if (RT_FAILURE(rc))
return RTVfsChainMsgErrorExitFailure("RTVfsChainOpenIoStream", pszFile, rc, offError, &ErrInfo.Core);
}
return RTEXITCODE_SUCCESS;
}
/**
* A /bin/cat clone.
*
* @returns Program exit code.
*
* @param cArgs The number of arguments.
* @param papszArgs The argument vector. (Note that this may be
* reordered, so the memory must be writable.)
*/
RTEXITCODE RTCmdCat(unsigned cArgs, char **papszArgs)
{
/*
* Parse the command line.
*/
static const RTGETOPTDEF s_aOptions[] =
{
{ "--show-all", 'A', RTGETOPT_REQ_NOTHING },
{ "--number-nonblanks", 'b', RTGETOPT_REQ_NOTHING },
{ "--show-ends-and-nonprinting", 'e', RTGETOPT_REQ_NOTHING },
{ "--show-ends", 'E', RTGETOPT_REQ_NOTHING },
{ "--advisory-output-lock", 'l', RTGETOPT_REQ_NOTHING },
{ "--number", 'n', RTGETOPT_REQ_NOTHING },
{ "--squeeze-blank", 's', RTGETOPT_REQ_NOTHING },
{ "--show-tabs-and-nonprinting", 't', RTGETOPT_REQ_NOTHING },
{ "--show-tabs", 'T', RTGETOPT_REQ_NOTHING },
{ "--unbuffered-output", 'u', RTGETOPT_REQ_NOTHING },
{ "--show-nonprinting", 'v', RTGETOPT_REQ_NOTHING },
};
RTCMDCATOPTS Opts;
Opts.fShowEnds = false;
Opts.fShowNonPrinting = false;
Opts.fShowTabs = false;
Opts.fSqueezeBlankLines = false;
Opts.fNumberLines = false;
Opts.fNumberNonBlankLines = false;
Opts.fAdvisoryOutputLock = false;
Opts.fUnbufferedOutput = false;
RTEXITCODE rcExit = RTEXITCODE_SUCCESS;
unsigned cProcessed = 0;
RTVFSIOSTREAM hVfsOutput = NIL_RTVFSIOSTREAM;
int rc = RTVfsIoStrmFromStdHandle(RTHANDLESTD_OUTPUT, RTFILE_O_WRITE | RTFILE_O_OPEN | RTFILE_O_DENY_NONE,
true /*fLeaveOpen*/, &hVfsOutput);
if (RT_FAILURE(rc))
return RTMsgErrorExitFailure("RTVfsIoStrmFromStdHandle: %Rrc", rc);
RTGETOPTSTATE GetState;
rc = RTGetOptInit(&GetState, cArgs, papszArgs, s_aOptions, RT_ELEMENTS(s_aOptions), 1,
RTGETOPTINIT_FLAGS_OPTS_FIRST);
if (RT_SUCCESS(rc))
{
bool fContinue = true;
do
{
RTGETOPTUNION ValueUnion;
int chOpt = RTGetOpt(&GetState, &ValueUnion);
switch (chOpt)
{
case 0:
/*
* If we've processed any files we're done. Otherwise take
* input from stdin and write the output to stdout.
*/
if (cProcessed > 0)
{
fContinue = false;
break;
}
ValueUnion.psz = "-";
RT_FALL_THRU();
case VINF_GETOPT_NOT_OPTION:
{
RTVFSIOSTREAM hVfsSrc;
RTEXITCODE rcExit2 = rtCmdCatOpenInput(ValueUnion.psz, &hVfsSrc);
if (rcExit2 == RTEXITCODE_SUCCESS)
{
if ( Opts.fShowEnds
|| Opts.fShowTabs
|| Opts.fShowNonPrinting
|| Opts.fSqueezeBlankLines
|| Opts.fNumberLines
|| Opts.fNumberNonBlankLines)
rcExit2 = rtCmdCatShowComplicated(hVfsOutput, hVfsSrc, ValueUnion.psz, &Opts);
else
rcExit2 = rtCmdCatShowRaw(hVfsOutput, hVfsSrc, ValueUnion.psz);
RTVfsIoStrmRelease(hVfsSrc);
}
if (rcExit2 != RTEXITCODE_SUCCESS)
rcExit = rcExit2;
cProcessed++;
break;
}
case 'A':
Opts.fShowNonPrinting = true;
Opts.fShowEnds = true;
Opts.fShowTabs = true;
break;
case 'b':
Opts.fNumberNonBlankLines = true;
break;
case 'e':
Opts.fShowNonPrinting = true;
RT_FALL_THRU();
case 'E':
Opts.fShowEnds = true;
break;
case 'l':
Opts.fAdvisoryOutputLock = true;
break;
case 'n':
Opts.fNumberLines = true;
Opts.fNumberNonBlankLines = false;
break;
case 's':
Opts.fSqueezeBlankLines = true;
break;
case 't':
Opts.fShowNonPrinting = true;
RT_FALL_THRU();
case 'T':
Opts.fShowTabs = true;
break;
case 'u': /* currently ignored */
Opts.fUnbufferedOutput = true;
break;
case 'v':
Opts.fShowNonPrinting = true;
break;
case 'h':
RTPrintf("Usage: to be written\nOption dump:\n");
for (unsigned i = 0; i < RT_ELEMENTS(s_aOptions); i++)
RTPrintf(" -%c,%s\n", s_aOptions[i].iShort, s_aOptions[i].pszLong);
fContinue = false;
break;
case 'V':
RTPrintf("%sr%d\n", RTBldCfgVersion(), RTBldCfgRevision());
fContinue = false;
break;
default:
rcExit = RTGetOptPrintError(chOpt, &ValueUnion);
fContinue = false;
break;
}
} while (fContinue);
}
else
rcExit = RTMsgErrorExit(RTEXITCODE_SYNTAX, "RTGetOptInit: %Rrc", rc);
RTVfsIoStrmRelease(hVfsOutput);
return rcExit;
}
int main(int argc, char **argv)
{
int rc = RTR3InitExe(argc, &argv, 0);
if (RT_FAILURE(rc))
return RTMsgInitFailure(rc);
return RTCmdCat(argc, argv);
}
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