[RFTraces] Switch to libc's getline() to parse frequencies.txt, resolving some weird issues with long lines in the file.

Also empty lines are now skipped instead of making the abort the
parsing.

Signed-off-by: Martin Herren (HB9FXX) <[email protected]>

Author: MartinHerren

rftrace.c

@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <math.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include "sgdp4h.h"
 #include "satutl.h"
@@ -516,7 +517,8 @@ struct trace *compute_trace(char *tlefile,double *mjd,int n,int site_id,float fr
   xyz_t satpos,satvel;
   double dx,dy,dz,dvx,dvy,dvz,r,v,za,vg;
   double freq0,dfreq;
-  char line[LIM];
+  char * line = NULL;
+  size_t line_size = 0;
   struct trace *t;
   float fmin,fmax;
   double ra,de,azi,alt;
@@ -540,10 +542,12 @@ struct trace *compute_trace(char *tlefile,double *mjd,int n,int site_id,float fr
     return NULL;
   } else {
     for (i=0;;) {
-      if (fgetline(infile,line,LIM)<=0)
-	break;
-      if (line[0]=='#')
-	continue;
+      if (getline(&line, &line_size, infile) < 0)
+        break;
+
+      if ((line[0] == '\n') || (line[0] == '#'))
+        continue;
+
       status=sscanf(line,"%d %lf",&satno,&freq0);
 
       if (status != 2) {
@@ -560,6 +564,12 @@ struct trace *compute_trace(char *tlefile,double *mjd,int n,int site_id,float fr
     fclose(infile);
     *nsat=i;
   }
+
+  // Free allocated buffer by getline() as we might return NULL
+  // before next call to to getline()
+  free(line);
+  line = NULL;
+
   // Break out
   if (i==0)
   {
@@ -603,10 +613,10 @@ struct trace *compute_trace(char *tlefile,double *mjd,int n,int site_id,float fr
 
   infile=fopen(freqlist,"r");
   for (j=0;;) {
-    if (fgetline(infile,line,LIM)<=0)
+    if (getline(&line, &line_size, infile) < 0)
       break;
 
-    if (line[0] == '#')
+    if ((line[0] == '\n') || (line[0] == '#'))
       continue;
 
     status=sscanf(line,"%d %lf",&satno,&freq0);
@@ -702,6 +712,8 @@ struct trace *compute_trace(char *tlefile,double *mjd,int n,int site_id,float fr
   fclose(stderr);
 
   // Free
+  free(line);
+  line = NULL;
 
   free_tles(tle_array);
   free(p);