Fix cross-platform sort-order issue in PowderN

mcstas-comps/examples/ILL/ILL_H22_D1B/ILL_H22_D1B.instr

@@ -33,7 +33,7 @@
 * obtained by scanning the temperature. A complete thermal variation of the
 * diffraction patterns (1.5 - 300 K) can be achieved in few hours (3-5h).
 *
-* %Example: lambda=2.52 Detector: D1B_BananaTheta_I=5097.25
+* %Example: lambda=2.52 Detector: D1B_BananaTheta_I=4400
 *
 * %Parameters:
 * lambda: [AA]     mean incident wavelength.

mcstas-comps/samples/PowderN.comp

@@ -268,14 +268,24 @@ struct line_info_struct
 
   // PN_list_compare *****************************************************************
 
-  int PN_list_compare (void const *a, void const *b)
-  {
-     struct line_data const *pa = a;
-     struct line_data const *pb = b;
-     double s = pa->q - pb->q;
+int PN_list_compare(const void *a, const void *b)
+{
+    const struct line_data *pa = a;
+    const struct line_data *pb = b;
+
+    /* Sort by q */
+    if (pa->q < pb->q) return -1;
+    if (pa->q > pb->q) return 1;
+
+    /* In case of tie, sort by F2 also */
+    if (pa->F2 < pb->F2) return -1;
+    if (pa->F2 > pb->F2) return 1;
 
-     if (!s) return 0;
-     else    return (s < 0 ? -1 : 1);
+    /* In case of tie, sort by j also */
+    if (pa->j < pb->j) return -1;
+    if (pa->j > pb->j) return 1;
+
+    return 0;
   } /* PN_list_compare */
 
 #ifndef CIF2HKL
@@ -1140,7 +1150,7 @@ TRACE
 
 
 			l_1 = v*(t3 - t2 + t1 - t0); /* Length to exit */
-      
+
 			pmul  *= Nq*l_full*my_s_n *exp(-(line_info.my_a_v/v+my_s)*(l+l_1))
 									  /(1-(p_inc+p_transmit));
 

mcstas-comps/union/Powder_process.comp

@@ -138,14 +138,24 @@ SHARE
 
   // PN_list_compare *****************************************************************
 
-  int PN_list_compare_union (void const *a, void const *b)
-  {
-     struct line_data_union const *pa = a;
-     struct line_data_union const *pb = b;
-     double s = pa->q - pb->q;
-
-     if (!s) return 0;
-     else    return (s < 0 ? -1 : 1);
+int PN_list_compare_union(const void *a, const void *b)
+{
+    const struct line_data_union *pa = a;
+    const struct line_data_union *pb = b;
+
+    /* Sort by q */
+    if (pa->q < pb->q) return -1;
+    if (pa->q > pb->q) return 1;
+
+    /* In case of tie, sort by F2 also */
+    if (pa->F2 < pb->F2) return -1;
+    if (pa->F2 > pb->F2) return 1;
+
+    /* In case of tie, sort by j also */
+    if (pa->j < pb->j) return -1;
+    if (pa->j > pb->j) return 1;
+
+    return 0;
   } /* PN_list_compare */
 
   int read_line_data_union(char *SC_file, struct line_info_struct_union *info)

mcxtrace-comps/samples/PowderN.comp

@@ -261,14 +261,24 @@ SHARE
   //   used for qsort, to sort reflections
   // input:  a,b: two 'line_data' reflection pointers.
   // output: -1,0,1 for a<b, a=b, a>b
-  int PN_list_compare (void const *a, void const *b)
-  {
-     struct line_data const *pa = a;
-     struct line_data const *pb = b;
-     double s = pa->q - pb->q;
+int PN_list_compare(const void *a, const void *b)
+{
+    const struct line_data *pa = a;
+    const struct line_data *pb = b;
+
+    /* Sort by q */
+    if (pa->q < pb->q) return -1;
+    if (pa->q > pb->q) return 1;
+
+    /* In case of tie, sort by F2 also */
+    if (pa->F2 < pb->F2) return -1;
+    if (pa->F2 > pb->F2) return 1;
 
-     if (!s) return 0;
-     else    return (s < 0 ? -1 : 1);
+    /* In case of tie, sort by j also */
+    if (pa->j < pb->j) return -1;
+    if (pa->j > pb->j) return 1;
+
+    return 0;
   } /* PN_list_compare */
 
   #ifndef CIF2HKL