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/electron.c b/src/electron.c
index 60bcec7..2f6902e 100644
--- a/src/electron.c
+++ b/src/electron.c
@@ -18,6 +18,7 @@
 #include <gsl/gsl_integration.h>
 #include <math.h> /* for fmax() */
 #include <gsl/gsl_sf_gamma.h>
+#include "util.h"
 
 static int initialized = 0;
 
@@ -215,7 +216,7 @@ static int init()
     double value;
     int n;
 
-    FILE *f = fopen("e_water_liquid.txt", "r");
+    FILE *f = open_file("e_water_liquid.txt", "r");
 
     if (!f) {
         fprintf(stderr, "failed to open e_water_liquid.txt: %s\n", strerror(errno));