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