Add datasheet.

[pspp-builds.git] / src / data / case-source.h

diff --git a/src/data/case-source.h b/src/data/case-source.h
index 4da72806de801ea12db44b60f749a0a9e59c99d7..833502cdebfe02a494dbe42b514205793132fbd5 100644 (file)
--- a/src/data/case-source.h
+++ b/src/data/case-source.h
@@ -1,6 +1,5 @@
 /* PSPP - computes sample statistics.
    Copyright (C) 1997-9, 2000, 2006 Free Software Foundation, Inc.
-   Written by Ben Pfaff <blp@gnu.org>.
 
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
@@ -24,9 +23,6 @@
 
 struct ccase;
 
-typedef struct write_case_data *write_case_data;
-typedef bool write_case_func (write_case_data);
-
 /* A case source. */
 struct case_source 
   {
@@ -43,23 +39,23 @@ struct case_source_class
        WRITE_CASE, if known, or -1 otherwise. */
     int (*count) (const struct case_source *);
 
-    /* Reads the cases one by one into C and for each one calls
-       WRITE_CASE passing the given AUX data.
-       Returns true if successful, false if an I/O error occurred. */
-    bool (*read) (struct case_source *,
-                  struct ccase *c,
-                  write_case_func *write_case, write_case_data aux);
+    /* Reads one case into C.
+       Returns true if successful, false at end of file or if an
+       I/O error occurred. */
+    bool (*read) (struct case_source *, struct ccase *);
 
-    /* Destroys the source. */
-    void (*destroy) (struct case_source *);
+    /* Destroys the source.
+       Returns true if successful read, false if an I/O occurred
+       during destruction or previously. */
+    bool (*destroy) (struct case_source *);
   };
 
 
 struct case_source *create_case_source (const struct case_source_class *,
                                         void *);
-void free_case_source (struct case_source *);
+bool free_case_source (struct case_source *);
 
-int case_source_is_class (const struct case_source *,
+bool case_source_is_class (const struct case_source *,
                           const struct case_source_class *);
 
 #endif /* case-source.h */