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