git.maemo.org Git - monky/blob - src/tailhead.c

   1 /* Conky, a system monitor, based on torsmo
   2  *
   3  * Any original torsmo code is licensed under the BSD license
   4  *
   5  * All code written since the fork of torsmo is licensed under the GPL
   6  *
   7  * Please see COPYING for details
   8  *
   9  * Copyright (c) 2004, Hannu Saransaari and Lauri Hakkarainen
  10  * Copyright (c) 2005-2009 Brenden Matthews, Philip Kovacs, et. al.
  11  *      (see AUTHORS)
  12  * All rights reserved.
  13  *
  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.
  18  *
  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/>.
  25  *
  26  */
  27
  28 #include "text_object.h"
  29 #include "logging.h"
  30
  31 #define MAX_HEADTAIL_LINES 30
  32 #define DEFAULT_MAX_HEADTAIL_USES 2
  33
  34 void init_tailhead(const char* type, const char* arg, struct text_object *obj, void* free_at_crash) {
  35         unsigned int args;
  36
  37         if(arg) {
  38                 obj->data.headtail.logfile=malloc(strlen(arg));
  39                 obj->data.headtail.max_uses = DEFAULT_MAX_HEADTAIL_USES;
  40                 args = sscanf(arg, "%s %d %d", obj->data.headtail.logfile, &obj->data.headtail.wantedlines, &obj->data.headtail.max_uses);
  41                 if(args == 2 || args == 3) {
  42                         if(obj->data.headtail.max_uses < 1) {
  43                                 free(obj->data.headtail.logfile);
  44                                 CRIT_ERR(obj, free_at_crash, "invalid arg for %s, next_check must be larger than 0", type);
  45                         }
  46                         if (obj->data.headtail.wantedlines > 0 && obj->data.headtail.wantedlines <= MAX_HEADTAIL_LINES) {
  47                                 to_real_path(obj->data.headtail.logfile, obj->data.headtail.logfile);
  48                                 obj->data.headtail.buffer = NULL;
  49                                 obj->data.headtail.current_use = 0;
  50                         }else{
  51                                 free(obj->data.headtail.logfile);
  52                                 CRIT_ERR(obj, free_at_crash, "invalid arg for %s, number of lines must be between 1 and %d", type, MAX_HEADTAIL_LINES);
  53                         }
  54                 } else {
  55                         free(obj->data.headtail.logfile);
  56                         CRIT_ERR(obj, free_at_crash, "%s needs a file as 1st and a number of lines as 2nd argument", type);
  57                 }
  58         } else {
  59                 CRIT_ERR(obj, free_at_crash, "%s needs arguments", type);
  60         }
  61 }
  62
  63 void print_tailhead(const char* type, struct text_object *obj, char *p, int p_max_size) {
  64         int i, endofstring = 0, linescounted = 0;
  65         FILE *fp;
  66
  67         if(obj->data.headtail.buffer && obj->data.headtail.current_use >= obj->data.headtail.max_uses - 1) {
  68                 free(obj->data.headtail.buffer);
  69                 obj->data.headtail.buffer = NULL;
  70                 obj->data.headtail.current_use = 0;
  71         }
  72         if(obj->data.headtail.buffer) {
  73                 strcpy(p, obj->data.headtail.buffer);
  74                 obj->data.headtail.current_use++;
  75         }else{
  76                 fp = open_file(obj->data.headtail.logfile, &obj->a);
  77                 if(fp != NULL) {
  78                         if(strcmp(type,"head") == 0) {
  79                                 for(i = 0; i < obj->data.headtail.wantedlines; i++) {
  80                                         fgets(p + endofstring, p_max_size - endofstring, fp);
  81                                         endofstring = strlen(p);
  82                                 }
  83                         } else if(strcmp(type,"tail") == 0) {
  84                                 fseek(fp, - p_max_size, SEEK_END);
  85                                 fread(p, 1, p_max_size, fp);
  86                                 p[p_max_size - 1] = 0;
  87                                 if(p[strlen(p)-1] == '\n') {    //work with or without \n at end of file
  88                                         p[strlen(p)-1] = 0;
  89                                 }
  90                                 for(i = strlen(p); i >= 0 && linescounted < obj->data.headtail.wantedlines; i--) {
  91                                         if(p[i] == '\n') {
  92                                                 linescounted++;
  93                                         }
  94                                 }
  95                                 if(i > 0) {
  96                                         strfold(p, i+2);
  97                                 }
  98                         } else {
  99                                 CRIT_ERR(NULL, NULL, "If you are seeing this then there is a bug in the code, report it !");
 100                         }
 101                         fclose(fp);
 102                         obj->data.headtail.buffer = strdup(p);
 103                 }
 104         }
 105         return;
 106 }