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