From 5c9f182abdda6edbcb64b44e910977f82bec739f Mon Sep 17 00:00:00 2001
From: Cees Bassa <cbassa@gmail.com>
Date: Tue, 25 Mar 2014 16:15:55 +0100
Subject: [PATCH] Added usage

---
 rffft.c  | 89 ++++++++++++++++++++++++++++++++++++--------------------
 rfplot.c |  1 +
 2 files changed, 58 insertions(+), 32 deletions(-)

diff --git a/rffft.c b/rffft.c
index 2a4efda..102b883 100644
--- a/rffft.c
+++ b/rffft.c
@@ -7,6 +7,21 @@
 #include <time.h>
 #include <sys/time.h>
 
+void usage(void)
+{
+  printf("rffft: FFT RF observations\n\n");
+  printf("-i <file>       Input file (can be fifo)\n");
+  printf("-p <prefix>     Output prefix\n");
+  printf("-f <frequency>  Center frequency (Hz)\n");
+  printf("-s <samprate>   Sample rate (Hz)\n");
+  printf("-c <chansize>   Channel size [100Hz]\n");
+  printf("-t <tint>       Integration time [1s]\n");
+  printf("-n <nsub>       Number of integrations per file [60]\n");
+  printf("-h              This help\n");
+
+  return;
+}
+
 int main(int argc,char *argv[])
 {
   int i,j,k,l,m,nchan,nint=1,arg=0,nbytes,nsub=60,flag;
@@ -21,40 +36,50 @@ int main(int argc,char *argv[])
   char tbuf[30],nfd[32],header[256]="";
 
   // Read arguments
-  while ((arg=getopt(argc,argv,"i:f:s:c:t:p:n:"))!=-1) {
-    switch(arg) {
+  if (argc>1) {
+    while ((arg=getopt(argc,argv,"i:f:s:c:t:p:n:h"))!=-1) {
+      switch(arg) {
+	
+      case 'i':
+	strcpy(infname,optarg);
+	break;
+	
+      case 'p':
+	strcpy(path,optarg);
+	break;
+	
+      case 'f':
+	freq=(double) atof(optarg);
+	break;
+	
+      case 's':
+	samp_rate=(double) atof(optarg);
+	break;
+	
+      case 'c':
+	fchan=atof(optarg);
+	break;
+	
+      case 'n':
+	nsub=atoi(optarg);
+	break;
+	
+      case 't':
+	tint=atof(optarg);
+	break;
+	
+      case 'h':
+	usage();
+	return 0;
 
-    case 'i':
-      strcpy(infname,optarg);
-      break;
-
-    case 'p':
-      strcpy(path,optarg);
-      break;
-
-    case 'f':
-      freq=(double) atof(optarg);
-      break;
-
-    case 's':
-      samp_rate=(double) atof(optarg);
-      break;
-      
-    case 'c':
-      fchan=atof(optarg);
-      break;
-
-    case 'n':
-      nsub=atoi(optarg);
-      break;
-
-    case 't':
-      tint=atof(optarg);
-      break;
-
-    default:
-      return 0;
+      default:
+	usage();
+	return 0;
+      }
     }
+  } else {
+    usage();
+    return 0;
   }
 
   // Number of channels
diff --git a/rfplot.c b/rfplot.c
index 1f6f549..6b8ccb8 100644
--- a/rfplot.c
+++ b/rfplot.c
@@ -86,6 +86,7 @@ int main(int argc,char *argv[])
 
       case 'h':
 	usage();
+	return 0;
 
       default:
 	usage();