wmradio/stationnames.c

   1 /*
   2  * Copyright (C) 12 Jun 2003 Tomas Cermak
   3  *
   4  * This file is part of wmradio program.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include "stationnames.h"
  22 #include "rc.h"
  23 #include <string.h>
  24 #include <stdlib.h>
  25 #include <math.h>
  26
  27 #define STATION_NAMES_INTERVAL 0.03
  28
  29 char *freqtostr(int freq)
  30 {
  31     static char buffer[10];
  32
  33     sprintf(buffer, "%i.%.2i\n", freq / 100,freq % 100);
  34     return buffer;
  35 }
  36
  37 int ato100i(char *str)
  38 {
  39     char *p,*q;
  40     int result,tmp;
  41
  42     p = strstr(str,".");
  43     if(!p) {
  44         return atoi(str) * 100;
  45     }
  46     q = p; q++;
  47     *p = 0;
  48     result = atoi(str) * 100;
  49     tmp = atoi(q);
  50     *p = '.';
  51
  52     switch(strlen(q)) {
  53     case 1:
  54         result += 10 * tmp;
  55         break;
  56     case 2:
  57         result += tmp;
  58     }
  59     return result;
  60 }
  61
  62 IniVariable *station_find_by_name(char *name)
  63 {
  64     return rc_get_variable_ini_variable(SECTION_NAMES,name);
  65 }
  66
  67 IniVariable *station_find_by_freq(int freq)
  68 {
  69     IniSection *section;
  70     IniVariable *variable;
  71     List *item;
  72     int cfreq;
  73
  74     section = rc_get_section(SECTION_NAMES);
  75     if(!section) return NULL;
  76     for(item = section->variables; item; item = item->next) {
  77         variable = item->data;
  78         cfreq = ato100i(variable->value);
  79         if((cfreq > freq - STATION_NAMES_INTERVAL) &&(cfreq < freq + STATION_NAMES_INTERVAL))
  80             return variable;
  81     }
  82     return NULL;
  83 }
  84
  85 void station_add(char *name, int freq)
  86 {
  87     rc_set_variable(SECTION_NAMES,name,freqtostr(freq));
  88 }
  89
  90 char *station_get_freq_name(int freq)
  91 {
  92     IniVariable *variable;
  93
  94     variable = station_find_by_freq(freq);
  95     if(!variable) return NULL;
  96     return variable->name;
  97 }
  98
  99 void station_set_freq_name(int freq, char *name)
 100 {
 101     rc_set_variable(SECTION_NAMES,name,freqtostr(freq));
 102 }
 103
 104 List *station_nearest(int freq)
 105 {
 106     IniSection *section;
 107     List *item,*current;
 108     IniVariable *item_var;
 109     int delta;
 110
 111     section = rc_get_section(SECTION_NAMES);
 112     if(! section ) return NULL;
 113     item = current = section -> variables;
 114     if(!item) return NULL;
 115     item_var = item->data;
 116     delta = abs(freq - ato100i(item_var->value));
 117     while(item) {
 118         item_var = item->data;
 119         if(abs(freq - ato100i(item_var->value)) < delta) {
 120             current = item;
 121             delta = abs(freq - ato100i(item_var->value));
 122         }
 123         item = item->next;
 124     }
 125     return current;
 126 }
 127
 128 int station_next_freq(int freq)
 129 {
 130     IniVariable *item_var;
 131     List *item;
 132
 133     item = station_nearest(freq);
 134     if(!item) return freq;
 135     if(item->next) {
 136         item_var = item->next->data;
 137         return ato100i(item_var->value);
 138     }
 139     while(item->prev) item = item->prev;
 140     item_var = item->data;
 141     return ato100i(item_var->value);
 142 }
 143
 144 int station_prev_freq(int freq)
 145 {
 146     IniVariable *item_var;
 147     List *item;
 148
 149     item = station_nearest(freq);
 150     if(!item) return freq;
 151     if(item->prev) {
 152         item_var = item->prev->data;
 153         return ato100i(item_var->value);
 154     }
 155     while(item->next) item = item->next;
 156     item_var = item->data;
 157     return ato100i(item_var->value);
 158 }
 159