зеркало из https://github.com/mozilla/pjs.git
167 строки
4.8 KiB
C
167 строки
4.8 KiB
C
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Netscape Portable Runtime (NSPR).
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998-2000
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "prio.h"
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#include "prprf.h"
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#include "prinit.h"
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#include "prthread.h"
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#include "prinrval.h"
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#include "plerror.h"
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#include "plgetopt.h"
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#include <stdlib.h>
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#define BUFFER_SIZE 500
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static PRFileDesc *out = NULL, *err = NULL;
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static void Help(void)
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{
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PR_fprintf(err, "Usage: tail [-n <n>] [-f] [-h] <filename>\n");
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PR_fprintf(err, "\t-t <n> Dally time in milliseconds\n");
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PR_fprintf(err, "\t-n <n> Number of bytes before <eof>\n");
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PR_fprintf(err, "\t-f Follow the <eof>\n");
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PR_fprintf(err, "\t-h This message and nothing else\n");
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} /* Help */
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PRIntn main(PRIntn argc, char **argv)
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{
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PRIntn rv = 0;
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PLOptStatus os;
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PRStatus status;
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PRFileDesc *file;
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PRFileInfo fileInfo;
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PRIntervalTime dally;
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char buffer[BUFFER_SIZE];
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PRBool follow = PR_FALSE;
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const char *filename = NULL;
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PRUint32 position = 0, seek = 0, time = 0;
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PLOptState *opt = PL_CreateOptState(argc, argv, "hfn:");
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out = PR_GetSpecialFD(PR_StandardOutput);
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err = PR_GetSpecialFD(PR_StandardError);
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while (PL_OPT_EOL != (os = PL_GetNextOpt(opt)))
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{
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if (PL_OPT_BAD == os) continue;
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switch (opt->option)
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{
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case 0: /* it's the filename */
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filename = opt->value;
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break;
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case 'n': /* bytes before end of file */
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seek = atoi(opt->value);
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break;
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case 't': /* dally time */
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time = atoi(opt->value);
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break;
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case 'f': /* follow the end of file */
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follow = PR_TRUE;
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break;
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case 'h': /* user wants some guidance */
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Help(); /* so give him an earful */
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return 2; /* but not a lot else */
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break;
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default:
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break;
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}
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}
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PL_DestroyOptState(opt);
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if (0 == time) time = 1000;
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dally = PR_MillisecondsToInterval(time);
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if (NULL == filename)
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{
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(void)PR_fprintf(out, "Input file not specified\n");
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rv = 1; goto done;
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}
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file = PR_Open(filename, PR_RDONLY, 0);
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if (NULL == file)
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{
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PL_FPrintError(err, "File cannot be opened for reading");
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return 1;
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}
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status = PR_GetOpenFileInfo(file, &fileInfo);
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if (PR_FAILURE == status)
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{
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PL_FPrintError(err, "Cannot acquire status of file");
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rv = 1; goto done;
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}
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if (seek > 0)
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{
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if (seek > fileInfo.size) seek = 0;
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position = PR_Seek(file, (fileInfo.size - seek), PR_SEEK_SET);
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if (-1 == (PRInt32)position)
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PL_FPrintError(err, "Cannot seek to starting position");
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}
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do
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{
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while (position < fileInfo.size)
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{
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PRInt32 read, bytes = fileInfo.size - position;
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if (bytes > sizeof(buffer)) bytes = sizeof(buffer);
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read = PR_Read(file, buffer, bytes);
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if (read != bytes)
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PL_FPrintError(err, "Cannot read to eof");
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position += read;
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PR_Write(out, buffer, read);
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}
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if (follow)
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{
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PR_Sleep(dally);
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status = PR_GetOpenFileInfo(file, &fileInfo);
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if (PR_FAILURE == status)
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{
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PL_FPrintError(err, "Cannot acquire status of file");
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rv = 1; goto done;
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}
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}
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} while (follow);
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done:
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PR_Close(file);
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return rv;
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} /* main */
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/* tail.c */
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