From 88df4d36b881e6a7aa08612737f72c2abd63bcb4 Mon Sep 17 00:00:00 2001
From: John Darrington <john@darrington.wattle.id.au>
Date: Fri, 2 Dec 2005 23:58:18 +0000
Subject: [PATCH] Added some extra missing_value accessor/mutator functions
 that I needed.

---
 src/missing-values.c | 61 ++++++++++++++++++++++++++++++++++++++++++--
 src/missing-values.h | 14 ++++++++--
 2 files changed, 71 insertions(+), 4 deletions(-)

diff --git a/src/missing-values.c b/src/missing-values.c
index 2a5b8fa4..6940c6cf 100644
--- a/src/missing-values.c
+++ b/src/missing-values.c
@@ -23,6 +23,7 @@
 #include <stdlib.h>
 #include "str.h"
 
+
 /* Initializes MV as a set of missing values for a variable of
    the given WIDTH.  Although only numeric variables and short
    string variables may have missing values, WIDTH may be any
@@ -35,10 +36,19 @@ mv_init (struct missing_values *mv, int width)
   mv->width = width;
 }
 
+void 
+mv_set_type(struct missing_values *mv, enum mv_type type)
+{
+  mv->type = type;
+}
+
+
 /* Copies SRC to MV. */
 void
 mv_copy (struct missing_values *mv, const struct missing_values *src) 
 {
+  assert(src);
+
   *mv = *src;
 }
 
@@ -135,7 +145,7 @@ mv_add_num_range (struct missing_values *mv, double low, double high)
 /* Returns true if MV contains an individual value,
    false if MV is empty (or contains only a range). */
 bool
-mv_has_value (struct missing_values *mv)
+mv_has_value (const struct missing_values *mv)
 {
   switch (mv->type) 
     {
@@ -163,10 +173,44 @@ mv_pop_value (struct missing_values *mv, union value *v)
   *v = mv->values[mv->type & 3];
 }
 
+/* Stores  a value  in *V.
+   MV must contain an individual value (as determined by
+   mv_has_value()). 
+   IDX is the zero based index of the value to get
+*/
+void
+mv_peek_value (const struct missing_values *mv, union value *v, int idx) 
+{
+  assert (idx >= 0 ) ;
+  assert (idx < 3);
+
+  assert (mv_has_value (mv));
+  *v = mv->values[idx];
+}
+
+void 
+mv_replace_value (struct missing_values *mv, const union value *v, int idx)
+{
+  assert (idx >= 0) ;
+  assert (idx < mv_n_values(mv));
+
+  mv->values[idx] = *v;
+}
+
+
+
+int  
+mv_n_values (const struct missing_values *mv)
+{
+  assert(mv_has_value(mv));
+  return mv->type & 3;
+}
+
+
 /* Returns true if MV contains a numeric range,
    false if MV is empty (or contains only individual values). */
 bool
-mv_has_range (struct missing_values *mv) 
+mv_has_range (const struct missing_values *mv) 
 {
   switch (mv->type) 
     {
@@ -195,6 +239,19 @@ mv_pop_range (struct missing_values *mv, double *low, double *high)
   mv->type &= 3;
 }
 
+
+/* Returns the numeric range from MV  into *LOW and
+   *HIGH.  MV must contain a individual range (as determined by
+   mv_has_range()). */
+void
+mv_peek_range (const struct missing_values *mv, double *low, double *high) 
+{
+  assert (mv_has_range (mv));
+  *low = mv->values[1].f;
+  *high = mv->values[2].f;
+}
+
+
 /* Returns true if values[IDX] is in use when the `type' member
    is set to TYPE (in struct missing_values),
    false otherwise. */
diff --git a/src/missing-values.h b/src/missing-values.h
index 6eff4285..b2e004c7 100644
--- a/src/missing-values.h
+++ b/src/missing-values.h
@@ -44,7 +44,10 @@ struct missing_values
     union value values[3];      /* Missing values.  [y,z] are the range. */
   };
 
+
 void mv_init (struct missing_values *, int width);
+void mv_set_type(struct missing_values *mv, enum mv_type type);
+
 void mv_copy (struct missing_values *, const struct missing_values *);
 bool mv_is_empty (const struct missing_values *);
 int mv_get_width (const struct missing_values *);
@@ -54,10 +57,17 @@ bool mv_add_str (struct missing_values *, const char[]);
 bool mv_add_num (struct missing_values *, double);
 bool mv_add_num_range (struct missing_values *, double low, double high);
 
-bool mv_has_value (struct missing_values *);
+bool mv_has_value (const struct missing_values *);
 void mv_pop_value (struct missing_values *, union value *);
-bool mv_has_range (struct missing_values *);
+void mv_peek_value (const struct missing_values *mv, union value *v, int idx);
+void mv_replace_value (struct missing_values *mv, const union value *v, int idx);
+
+int  mv_n_values (const struct missing_values *mv);
+
+
+bool mv_has_range (const struct missing_values *);
 void mv_pop_range (struct missing_values *, double *low, double *high);
+void mv_peek_range (const struct missing_values *, double *low, double *high);
 
 bool mv_is_resizable (struct missing_values *, int width);
 void mv_resize (struct missing_values *, int width);
-- 
2.30.2