/* $Id: RTCat.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */ /** @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 #include #include #include #include #include #include #include #include #include #include /********************************************************************************************************************************* * 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); }