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uk2iod.c
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uk2iod.c
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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#define LIM 128
int fgetline(FILE *file,char *s,int lim);
int find_satno(char *desig0)
{
FILE *file;
int satno=99999,status;
char desig[16];
char *env,filename[LIM];
env=getenv("ST_DATADIR");
sprintf(filename,"%s/data/desig.txt",env);
file=fopen(filename,"r");
if (file==NULL) {
fprintf(stderr,"Designation file not found!\n");
exit(0);
}
while (!feof(file)) {
status=fscanf(file,"%d %s",&satno,desig);
if (strcmp(desig,desig0)==0)
break;
}
fclose(file);
return satno;
}
int main(int argc,char *argv[])
{
FILE *file;
char line[LIM];
int intidy,intido,piece,site,year,month,day,hour,min,sec,fsec,satno;
char desig[16],pdesig[16];
int format,epoch;
float csec,cang,x;
int rah,ram,rafm,ded,dem,defm;
float tm,tx,am,ax;
char sign;
file=fopen(argv[1],"r");
while (fgetline(file,line,LIM)>0) {
// Skip wrong lines
if (!isdigit(line[0]))
continue;
// Skip short lines
if (strlen(line)<55)
continue;
// Scan line
sscanf(line,"%02d%03d%02d%04d%02d%02d%02d%02d%02d%02d%03d",&intidy,&intido,
&piece,
&site,
&year,
&month,
&day,
&hour,
&min,
&sec,
&fsec);
sscanf(line+27,"%f",&csec);
sscanf(line+33,"%1d",&format);
if (format==2) {
sscanf(line+34,"%02d%02d%d",&rah,&ram,&rafm);
sscanf(line+42,"%c%02d%02d%d",&sign,&ded,&dem,&defm);
} else if (format==3) {
sscanf(line+34,"%02d%02d%d",&rah,&ram,&rafm);
sscanf(line+42,"%c%02d%02d",&sign,&ded,&dem);
}
sscanf(line+50,"%f",&cang);
sscanf(line+54,"%d",&epoch);
// Year switch
if (year>50)
year+=1900;
else
year+=2000;
// Format designation
if (piece<26) {
sprintf(desig,"%02d %03d%c",intidy,intido,piece+'A'-1);
sprintf(pdesig,"%02d%03d%c",intidy,intido,piece+'A'-1);
} else {
fprintf(stderr,"Failed to understand designation!\n");
fprintf(stderr,"%s\n",line);
continue;
}
// Test data format
if (format==3) {
x=dem*0.6;
dem=(int) floor(x);
defm=(int) (100.0*(x-dem));
} else if (format!=2) {
fprintf(stderr,"Angle format not implemented!\n");
fprintf(stderr,"%s\n",line);
continue;
}
// Fractional seconds
if (fsec<10)
fsec*=100;
else if (fsec<100)
fsec*=10;
// Time accuracy
if (csec<10)
csec*=0.1;
else if (csec<100)
csec*=0.01;
tx=floor(log10(csec))+8;
tm=floor(csec/pow(10.0,tx-8));
// angle accuracy
if (cang<10)
cang*=1;
else if (cang<100)
cang*=0.1;
ax=floor(log10(cang))+8;
am=floor(cang/pow(10.0,ax-8));
// Fractional RA
if (rafm<10)
rafm*=100;
else if (rafm<100)
rafm*=10;
// Fractional DE
if (defm<10)
defm*=10;
else if (defm<100)
defm*=1;
// Get satellite number
satno=find_satno(pdesig);
// Format IOD line
printf("%05d %s %04d G %04d%02d%02d%02d%02d%02d%03d %1.0f%1.0f %d%d ",satno,desig,site,year,month,day,hour,min,sec,fsec,tm,tx,format,epoch);
printf("%02d%02d%03d%c%02d%02d%02d %1.0f%1.0f\n",rah,ram,rafm,sign,ded,dem,defm,am,ax);
}
fclose(file);
return 0;
}
// Read a line of maximum length int lim from file FILE into string s
int fgetline(FILE *file,char *s,int lim)
{
int c,i=0;
while (--lim > 0 && (c=fgetc(file)) != EOF && c != '\n')
s[i++] = c;
if (c == '\n')
s[i++] = c;
s[i] = '\0';
return i;
}