update code to allow you to run the fit outside of the src directory

To enable the fitter to run outside of the src directory, I created a new
function open_file() which works exactly like fopen() except that it searches
for the file in both the current working directory and the path specified by an
environment variable.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/muon.c b/src/muon.c
index 452dfba..4b161ed 100644
--- a/src/muon.c
+++ b/src/muon.c
@@ -15,6 +15,7 @@
 #include "scattering.h"
 #include "pmt_response.h"
 #include "misc.h"
+#include "util.h"
 
 static int initialized = 0;
 
@@ -158,7 +159,7 @@ static int init()
     double value;
     int n;
 
-    FILE *f = fopen("muE_deuterium_oxide_liquid.txt", "r");
+    FILE *f = open_file("muE_deuterium_oxide_liquid.txt", "r");
 
     if (!f) {
         fprintf(stderr, "failed to open muE_water_liquid.txt: %s\n", strerror(errno));