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bandplan.c
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bandplan.c
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// $Id: bandplan.c,v 1.11 2018/04/22 18:08:48 karn Exp $
// Routines for processing the file /usr/local/share/ka9q-radio/bandplan.txt
// containing general information about ham radio bandplans, other radio channels, etc
// This information is displayed in the 'Info' window by the 'radio' program
// Copyright 2018, Phil Karn, KA9Q
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#if defined(linux)
#include <bsd/string.h>
#endif
#include <ctype.h>
#include <math.h>
#include <limits.h>
#include "radio.h"
#include "bandplan.h"
char Bandplan_file[] = "bandplan.txt";
#define MAX_BANDPLANS 1000
struct bandplan Bandplans[MAX_BANDPLANS];
int Nbandplans;
// Sort callback function
static int compar(void const *a,void const *b){
const double f = *(double *)a;
const struct bandplan *bp = b;
if(f < bp->lower)
return -1;
if(f > bp->upper)
return 1;
else
return 0;
}
int Bandplan_init;
extern int init_bandplan(void);
// Look up a given frequency, return pointer to appropriate entry
struct bandplan *lookup_frequency(double f){
double key;
key = round(f) / 1.0e6;
if(!Bandplan_init){
init_bandplan();
Bandplan_init = 1;
}
return bsearch(&key,Bandplans,Nbandplans,sizeof(struct bandplan),compar);
}
// Read bandplan.txt, initialize data structures
int init_bandplan(){
char fname[PATH_MAX];
snprintf(fname,sizeof(fname),"%s/%s",Libdir,Bandplan_file);
FILE * const fp = fopen(fname,"r");
if(fp == NULL)
return -1;
char line[160];
memset(line,0,sizeof(line));
int i=0;
for(i=0; i < MAX_BANDPLANS && fgets(line,sizeof(line),fp) != NULL;){
if(line[0] == ';' || line[0] == '#')
continue;
char classes[160];
char modes[160];
double lower,upper;
int nchar = 0;
int r = sscanf(line,"%lf %lf %160s %160s %n",&lower,&upper,classes,modes,&nchar);
if(r < 4){
double center,bw;
r = sscanf(line,"%lf b%lf %160s %160s %n",¢er,&bw,classes,modes,&nchar);
if(r < 4)
continue;
lower = center - bw/2;
upper = center + bw/2;
}
memset(&Bandplans[i],0,sizeof(struct bandplan));
Bandplans[i].lower = lower;
Bandplans[i].upper = upper;
for(char *cp = classes;*cp != '\0';cp++){
switch(tolower(*cp)){
case '-':
Bandplans[i].classes = 0; // No privileges
break;
case 'e':
Bandplans[i].classes |= EXTRA_CLASS;
break;
case 'a':
Bandplans[i].classes |= ADVANCED_CLASS;
break;
case 'g':
Bandplans[i].classes |= GENERAL_CLASS;
break;
case 't':
Bandplans[i].classes |= TECHNICIAN_CLASS;
break;
case 'n':
Bandplans[i].classes |= NOVICE_CLASS;
break;
}
}
for(char *cp = modes;*cp != '\0';cp++){
switch(tolower(*cp)){
case '-':
Bandplans[i].modes = 0; // No modes!
break;
case 'c':
Bandplans[i].modes |= CW;
break;
case 'v':
Bandplans[i].modes |= VOICE;
break;
case 'i':
Bandplans[i].modes |= IMAGE;
break;
case 'd':
Bandplans[i].modes |= DATA;
break;
}
}
strlcpy(Bandplans[i].name,line + nchar,sizeof(Bandplans[i].name));
i++;
}
#if 0
fprintf(stderr,"%d entries read\n",i);
#endif
Nbandplans = i;
return 0;
}
#if 0
// Standalone test driver program
int main(){
double f;
struct bandplan const *bp;
while(1){
scanf("%lf",&f);
bp = lookup_frequency(f);
if(bp != NULL){
printf("%ld: %lf",f,bp->wavelength);
if(bp->modes & CW)
printf(" CW");
if(bp->modes & DATA)
printf(" Data");
if(bp->modes & VOICE)
printf(" Voice");
if(bp->modes & IMAGE)
printf(" Image");
printf("\n");
}
}
}
#endif