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Diffstat (limited to '')
| -rw-r--r-- | src/libs/xpcom18a4/nsprpub/tools/tail.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/src/libs/xpcom18a4/nsprpub/tools/tail.c b/src/libs/xpcom18a4/nsprpub/tools/tail.c new file mode 100644 index 00000000..dc729c15 --- /dev/null +++ b/src/libs/xpcom18a4/nsprpub/tools/tail.c @@ -0,0 +1,166 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* ***** BEGIN LICENSE BLOCK ***** + * Version: MPL 1.1/GPL 2.0/LGPL 2.1 + * + * The contents of this file are subject to the Mozilla Public License Version + * 1.1 (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * http://www.mozilla.org/MPL/ + * + * Software distributed under the License is distributed on an "AS IS" basis, + * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License + * for the specific language governing rights and limitations under the + * License. + * + * The Original Code is the Netscape Portable Runtime (NSPR). + * + * The Initial Developer of the Original Code is + * Netscape Communications Corporation. + * Portions created by the Initial Developer are Copyright (C) 1998-2000 + * the Initial Developer. All Rights Reserved. + * + * Contributor(s): + * + * Alternatively, the contents of this file may be used under the terms of + * either the GNU General Public License Version 2 or later (the "GPL"), or + * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), + * in which case the provisions of the GPL or the LGPL are applicable instead + * of those above. If you wish to allow use of your version of this file only + * under the terms of either the GPL or the LGPL, and not to allow others to + * use your version of this file under the terms of the MPL, indicate your + * decision by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL or the LGPL. If you do not delete + * the provisions above, a recipient may use your version of this file under + * the terms of any one of the MPL, the GPL or the LGPL. + * + * ***** END LICENSE BLOCK ***** */ + +#include "prio.h" +#include "prprf.h" +#include "prinit.h" +#include "prthread.h" +#include "prinrval.h" + +#include "plerror.h" +#include "plgetopt.h" + +#include <stdlib.h> + +#define BUFFER_SIZE 500 + +static PRFileDesc *out = NULL, *err = NULL; + +static void Help(void) +{ + PR_fprintf(err, "Usage: tail [-n <n>] [-f] [-h] <filename>\n"); + PR_fprintf(err, "\t-t <n> Dally time in milliseconds\n"); + PR_fprintf(err, "\t-n <n> Number of bytes before <eof>\n"); + PR_fprintf(err, "\t-f Follow the <eof>\n"); + PR_fprintf(err, "\t-h This message and nothing else\n"); +} /* Help */ + +PRIntn main(PRIntn argc, char **argv) +{ + PRIntn rv = 0; + PLOptStatus os; + PRStatus status; + PRFileDesc *file; + PRFileInfo fileInfo; + PRIntervalTime dally; + char buffer[BUFFER_SIZE]; + PRBool follow = PR_FALSE; + const char *filename = NULL; + PRUint32 position = 0, seek = 0, time = 0; + PLOptState *opt = PL_CreateOptState(argc, argv, "hfn:"); + + out = PR_GetSpecialFD(PR_StandardOutput); + err = PR_GetSpecialFD(PR_StandardError); + + while (PL_OPT_EOL != (os = PL_GetNextOpt(opt))) + { + if (PL_OPT_BAD == os) continue; + switch (opt->option) + { + case 0: /* it's the filename */ + filename = opt->value; + break; + case 'n': /* bytes before end of file */ + seek = atoi(opt->value); + break; + case 't': /* dally time */ + time = atoi(opt->value); + break; + case 'f': /* follow the end of file */ + follow = PR_TRUE; + break; + case 'h': /* user wants some guidance */ + Help(); /* so give him an earful */ + return 2; /* but not a lot else */ + break; + default: + break; + } + } + PL_DestroyOptState(opt); + + if (0 == time) time = 1000; + dally = PR_MillisecondsToInterval(time); + + if (NULL == filename) + { + (void)PR_fprintf(out, "Input file not specified\n"); + rv = 1; goto done; + } + file = PR_Open(filename, PR_RDONLY, 0); + if (NULL == file) + { + PL_FPrintError(err, "File cannot be opened for reading"); + return 1; + } + + status = PR_GetOpenFileInfo(file, &fileInfo); + if (PR_FAILURE == status) + { + PL_FPrintError(err, "Cannot acquire status of file"); + rv = 1; goto done; + } + if (seek > 0) + { + if (seek > fileInfo.size) seek = 0; + position = PR_Seek(file, (fileInfo.size - seek), PR_SEEK_SET); + if (-1 == (PRInt32)position) + PL_FPrintError(err, "Cannot seek to starting position"); + } + + do + { + while (position < fileInfo.size) + { + PRInt32 read, bytes = fileInfo.size - position; + if (bytes > sizeof(buffer)) bytes = sizeof(buffer); + read = PR_Read(file, buffer, bytes); + if (read != bytes) + PL_FPrintError(err, "Cannot read to eof"); + position += read; + PR_Write(out, buffer, read); + } + + if (follow) + { + PR_Sleep(dally); + status = PR_GetOpenFileInfo(file, &fileInfo); + if (PR_FAILURE == status) + { + PL_FPrintError(err, "Cannot acquire status of file"); + rv = 1; goto done; + } + } + } while (follow); + +done: + PR_Close(file); + + return rv; +} /* main */ + +/* tail.c */ |