132 lines
3.7 KiB
C
132 lines
3.7 KiB
C
/* -*-mode: c; indent-tabs-mode: nil; c-basic-offset: 2; -*-
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*/
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/**
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* Utilities for the quality of service module mod_qos.
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*
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* qshead.c: Shows the beginning of a log file stopping at the provided pattern.
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*
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* See http://mod-qos.sourceforge.net/ for further
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* details.
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*
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* Copyright (C) 2023 Pascal Buchbinder
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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static const char revision[] = "$Id: qshead.c 2654 2022-05-13 09:12:42Z pbuchbinder $";
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <signal.h>
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#include "qs_util.h"
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static void usage(char *cmd, int man) {
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if(man) {
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//.TH [name of program] [section number] [center footer] [left footer] [center header]
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printf(".TH %s 1 \"%s\" \"mod_qos utilities %s\" \"%s man page\"\n", qs_CMD(cmd), man_date,
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man_version, cmd);
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}
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printf("\n");
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if(man) {
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printf(".SH NAME\n");
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}
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qs_man_print(man, "%s - an utility reading from stdin and printing all"
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" lines to stdout until"
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" reaching the defined pattern.\n", cmd);
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printf("\n");
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if(man) {
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printf(".SH SYNOPSIS\n");
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}
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qs_man_print(man, "%s%s -p <pattern>\n", man ? "" : "Usage: ", cmd);
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printf("\n");
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if(man) {
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printf(".SH DESCRIPTION\n");
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} else {
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printf("Summary\n");
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}
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qs_man_print(man, " %s reads lines from stdin and prints them to stdout until a line contains\n", cmd);
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qs_man_print(man, " the specified pattern (literal string).\n");
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printf("\n");
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if(man) {
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printf(".SH OPTIONS\n");
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} else {
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printf("Options\n");
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}
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if(man) printf(".TP\n");
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qs_man_print(man, " -p <pattern>\n");
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if(man) printf("\n");
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qs_man_print(man, " Search pattern (literal string).\n");
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printf("\n");
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if(man) {
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printf(".SH SEE ALSO\n");
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printf("qsdt(1), qsexec(1), qsfilter2(1), qsgeo(1), qsgrep(1), qslog(1), qslogger(1), qspng(1), qsre(1), qsrespeed(1), qsrotate(1), qssign(1) qstail(1)\n");
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printf(".SH AUTHOR\n");
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printf("Pascal Buchbinder, http://mod-qos.sourceforge.net/\n");
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} else {
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printf("See http://mod-qos.sourceforge.net/ for further details.\n");
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}
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if(man) {
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exit(0);
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} else {
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exit(1);
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}
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}
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int main(int argc, const char * const argv[]) {
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char line[32768];
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const char *pattern = NULL;
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char *cmd = strrchr(argv[0], '/');
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int status = 0;
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if(cmd == NULL) {
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cmd = (char *)argv[0];
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} else {
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cmd++;
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}
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argc--;
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argv++;
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while(argc >= 1) {
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if(strcmp(*argv,"-p") == 0) {
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if (--argc >= 1) {
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pattern = *(++argv);
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}
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} else if(strcmp(*argv,"-?") == 0) {
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usage(cmd, 0);
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} else if(strcmp(*argv,"-help") == 0) {
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usage(cmd, 0);
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} else if(strcmp(*argv,"--man") == 0) {
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usage(cmd, 1);
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}
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argc--;
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argv++;
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}
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if(pattern == NULL) {
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usage(cmd, 0);
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}
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while(fgets(line, sizeof(line), stdin) != NULL) {
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printf("%s", line);
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if(strstr(line, pattern)) {
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return status;
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}
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}
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return status;
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}
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