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conky/src/tailhead.c

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/* -*- mode: c; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: t -*-
*
* Conky, a system monitor, based on torsmo
*
* Any original torsmo code is licensed under the BSD license
*
* All code written since the fork of torsmo is licensed under the GPL
*
* Please see COPYING for details
*
* Copyright (c) 2004, Hannu Saransaari and Lauri Hakkarainen
* Copyright (c) 2005-2009 Brenden Matthews, Philip Kovacs, et. al.
* (see AUTHORS)
* All rights reserved.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
2009-07-27 20:47:19 +00:00
* vim: ts=4 sw=4 noet ai cindent syntax=c
*
*/
#include "text_object.h"
#include "logging.h"
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#define MAX_HEADTAIL_LINES 30
#define DEFAULT_MAX_HEADTAIL_USES 2
void tailstring(char *string, int endofstring, int wantedlines) {
int i, linescounted = 0;
string[endofstring] = 0;
if(endofstring > 0) {
if(string[endofstring-1] == '\n') { //work with or without \n at end of file
string[endofstring-1] = 0;
}
for(i = endofstring - 1; i >= 0 && linescounted < wantedlines; i--) {
if(string[i] == '\n') {
linescounted++;
}
}
if(i > 0) {
strfold(string, i+2);
}
}
}
void init_tailhead(const char* type, const char* arg, struct text_object *obj, void* free_at_crash) {
unsigned int args;
if(arg) {
obj->data.headtail.logfile=malloc(DEFAULT_TEXT_BUFFER_SIZE);
obj->data.headtail.max_uses = DEFAULT_MAX_HEADTAIL_USES;
args = sscanf(arg, "%s %d %d", obj->data.headtail.logfile, &obj->data.headtail.wantedlines, &obj->data.headtail.max_uses);
if(args == 2 || args == 3) {
if(obj->data.headtail.max_uses < 1) {
free(obj->data.headtail.logfile);
CRIT_ERR(obj, free_at_crash, "invalid arg for %s, next_check must be larger than 0", type);
}
if (obj->data.headtail.wantedlines > 0 && obj->data.headtail.wantedlines <= MAX_HEADTAIL_LINES) {
to_real_path(obj->data.headtail.logfile, obj->data.headtail.logfile);
obj->data.headtail.buffer = NULL;
obj->data.headtail.current_use = 0;
}else{
free(obj->data.headtail.logfile);
CRIT_ERR(obj, free_at_crash, "invalid arg for %s, number of lines must be between 1 and %d", type, MAX_HEADTAIL_LINES);
}
} else {
free(obj->data.headtail.logfile);
CRIT_ERR(obj, free_at_crash, "%s needs a file as 1st and a number of lines as 2nd argument", type);
}
} else {
CRIT_ERR(obj, free_at_crash, "%s needs arguments", type);
}
}
void print_tailhead(const char* type, struct text_object *obj, char *p, int p_max_size) {
int fd, i, endofstring = 0, linescounted = 0;
FILE *fp;
struct stat st;
//empty the buffer and reset the counter if we used it the max number of times
if(obj->data.headtail.buffer && obj->data.headtail.current_use >= obj->data.headtail.max_uses - 1) {
free(obj->data.headtail.buffer);
obj->data.headtail.buffer = NULL;
obj->data.headtail.current_use = 0;
}
//use the buffer if possible
if(obj->data.headtail.buffer) {
strcpy(p, obj->data.headtail.buffer);
obj->data.headtail.current_use++;
}else{ //otherwise find the needed data
if(stat(obj->data.headtail.logfile, &st) == 0) {
if (S_ISFIFO(st.st_mode)) {
fd = open_fifo(obj->data.headtail.logfile, &obj->a);
if(fd != -1) {
if(strcmp(type, "head") == 0) {
for(i = 0; linescounted < obj->data.headtail.wantedlines; i++) {
read(fd, p + i, 1);
if(p[i] == '\n') {
linescounted++;
}
}
p[i] = 0;
} else if(strcmp(type, "tail") == 0) {
i = read(fd, p, p_max_size - 1);
tailstring(p, i, obj->data.headtail.wantedlines);
} else {
CRIT_ERR(NULL, NULL, "If you are seeing this then there is a bug in the code, report it !");
}
}
close(fd);
} else {
fp = open_file(obj->data.headtail.logfile, &obj->a);
if(fp != NULL) {
if(strcmp(type, "head") == 0) {
for(i = 0; i < obj->data.headtail.wantedlines; i++) {
fgets(p + endofstring, p_max_size - endofstring, fp);
endofstring = strlen(p);
}
} else if(strcmp(type, "tail") == 0) {
fseek(fp, - p_max_size, SEEK_END);
i = fread(p, 1, p_max_size - 1, fp);
tailstring(p, i, obj->data.headtail.wantedlines);
} else {
CRIT_ERR(NULL, NULL, "If you are seeing this then there is a bug in the code, report it !");
}
fclose(fp);
}
}
obj->data.headtail.buffer = strdup(p);
} else {
CRIT_ERR(NULL, NULL, "$%s can't find information about %s", type, obj->data.headtail.logfile);
}
}
return;
}