1 /* -*- mode: c; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: t -*-
2 * vim: ts=4 sw=4 noet ai cindent syntax=c
4 * Conky, a system monitor, based on torsmo
6 * Any original torsmo code is licensed under the BSD license
8 * All code written since the fork of torsmo is licensed under the GPL
10 * Please see COPYING for details
12 * Copyright (c) 2004, Hannu Saransaari and Lauri Hakkarainen
13 * Copyright (c) 2005-2009 Brenden Matthews, Philip Kovacs, et. al.
15 * All rights reserved.
17 * This program is free software: you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License as published by
19 * the Free Software Foundation, either version 3 of the License, or
20 * (at your option) any later version.
22 * This program is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25 * GNU General Public License for more details.
26 * You should have received a copy of the GNU General Public License
27 * along with this program. If not, see <http://www.gnu.org/licenses/>.
31 #include "text_object.h"
37 #define MAX_HEADTAIL_LINES 30
38 #define DEFAULT_MAX_HEADTAIL_USES 2
40 void tailstring(char *string, int endofstring, int wantedlines) {
41 int i, linescounted = 0;
43 string[endofstring] = 0;
45 if(string[endofstring-1] == '\n') { //work with or without \n at end of file
46 string[endofstring-1] = 0;
48 for(i = endofstring - 1; i >= 0 && linescounted < wantedlines; i--) {
49 if(string[i] == '\n') {
59 void init_tailhead(const char* type, const char* arg, struct text_object *obj, void* free_at_crash) {
63 obj->data.headtail.logfile=malloc(DEFAULT_TEXT_BUFFER_SIZE);
64 obj->data.headtail.max_uses = DEFAULT_MAX_HEADTAIL_USES;
65 args = sscanf(arg, "%s %d %d", obj->data.headtail.logfile, &obj->data.headtail.wantedlines, &obj->data.headtail.max_uses);
66 if(args == 2 || args == 3) {
67 if(obj->data.headtail.max_uses < 1) {
68 free(obj->data.headtail.logfile);
69 CRIT_ERR(obj, free_at_crash, "invalid arg for %s, next_check must be larger than 0", type);
71 if (obj->data.headtail.wantedlines > 0 && obj->data.headtail.wantedlines <= MAX_HEADTAIL_LINES) {
72 to_real_path(obj->data.headtail.logfile, obj->data.headtail.logfile);
73 obj->data.headtail.buffer = NULL;
74 obj->data.headtail.current_use = 0;
76 free(obj->data.headtail.logfile);
77 CRIT_ERR(obj, free_at_crash, "invalid arg for %s, number of lines must be between 1 and %d", type, MAX_HEADTAIL_LINES);
80 free(obj->data.headtail.logfile);
81 CRIT_ERR(obj, free_at_crash, "%s needs a file as 1st and a number of lines as 2nd argument", type);
84 CRIT_ERR(obj, free_at_crash, "%s needs arguments", type);
88 void print_tailhead(const char* type, struct text_object *obj, char *p, int p_max_size) {
89 int fd, i, endofstring = 0, linescounted = 0;
93 //empty the buffer and reset the counter if we used it the max number of times
94 if(obj->data.headtail.buffer && obj->data.headtail.current_use >= obj->data.headtail.max_uses - 1) {
95 free(obj->data.headtail.buffer);
96 obj->data.headtail.buffer = NULL;
97 obj->data.headtail.current_use = 0;
99 //use the buffer if possible
100 if(obj->data.headtail.buffer) {
101 strcpy(p, obj->data.headtail.buffer);
102 obj->data.headtail.current_use++;
103 }else{ //otherwise find the needed data
104 if(stat(obj->data.headtail.logfile, &st) == 0) {
105 if (S_ISFIFO(st.st_mode)) {
106 fd = open_fifo(obj->data.headtail.logfile, &obj->a);
108 if(strcmp(type, "head") == 0) {
109 for(i = 0; linescounted < obj->data.headtail.wantedlines; i++) {
116 } else if(strcmp(type, "tail") == 0) {
117 i = read(fd, p, p_max_size - 1);
118 tailstring(p, i, obj->data.headtail.wantedlines);
120 CRIT_ERR(NULL, NULL, "If you are seeing this then there is a bug in the code, report it !");
125 fp = open_file(obj->data.headtail.logfile, &obj->a);
127 if(strcmp(type, "head") == 0) {
128 for(i = 0; i < obj->data.headtail.wantedlines; i++) {
129 fgets(p + endofstring, p_max_size - endofstring, fp);
130 endofstring = strlen(p);
132 } else if(strcmp(type, "tail") == 0) {
133 fseek(fp, - p_max_size, SEEK_END);
134 i = fread(p, 1, p_max_size - 1, fp);
135 tailstring(p, i, obj->data.headtail.wantedlines);
137 CRIT_ERR(NULL, NULL, "If you are seeing this then there is a bug in the code, report it !");
142 obj->data.headtail.buffer = strdup(p);
144 CRIT_ERR(NULL, NULL, "$%s can't find information about %s", type, obj->data.headtail.logfile);