X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fdata%2Fcasewriter-translator.c;h=c630b44cda397dfffccd980c9d3ecb65255e91dc;hb=ee7be3e962a4faba54d7bc01364365b51167242c;hp=f2a0b68e6a5683d6c903ed40de0510ca4f88742c;hpb=43b1296aafe7582e7dbe6c2b6a8b478d7d9b0fcf;p=pspp

diff --git a/src/data/casewriter-translator.c b/src/data/casewriter-translator.c
index f2a0b68e6a..c630b44cda 100644
--- a/src/data/casewriter-translator.c
+++ b/src/data/casewriter-translator.c
@@ -29,17 +29,29 @@ struct casewriter_translator
   {
     struct casewriter *subwriter;
 
-    void (*translate) (const struct ccase *input, struct ccase *output,
-                       void *aux);
+    void (*translate) (struct ccase *input, struct ccase *output, void *aux);
     bool (*destroy) (void *aux);
     void *aux;
   };
 
-static struct casewriter_class casewriter_translator_class;
+static const struct casewriter_class casewriter_translator_class;
 
+/* Creates and returns a new casewriter whose cases are passed
+   through TRANSLATE, which must create case OUTPUT, with
+   OUTPUT_VALUE_CNT values, and populate it based on INPUT and
+   auxiliary data AUX.  The translated cases are then written to
+   SUBWRITER.  TRANSLATE must also destroy INPUT.
+
+   When the translating casewriter is destroyed, DESTROY will be
+   called to allow any state maintained by TRANSLATE to be freed.
+
+   After this function is called, SUBWRITER must not ever again
+   be referenced directly.  It will be destroyed automatically
+   when the translating casewriter is destroyed. */
 struct casewriter *
 casewriter_create_translator (struct casewriter *subwriter,
-                              void (*translate) (const struct ccase *input,
+                              size_t translated_value_cnt,
+                              void (*translate) (struct ccase *input,
                                                  struct ccase *output,
                                                  void *aux),
                               bool (*destroy) (void *aux),
@@ -51,7 +63,8 @@ casewriter_create_translator (struct casewriter *subwriter,
   ct->translate = translate;
   ct->destroy = destroy;
   ct->aux = aux;
-  writer = casewriter_create (&casewriter_translator_class, ct);
+  writer = casewriter_create (translated_value_cnt,
+                              &casewriter_translator_class, ct);
   taint_propagate (casewriter_get_taint (ct->subwriter),
                    casewriter_get_taint (writer));
   return writer;
@@ -88,7 +101,7 @@ casewriter_translator_convert_to_reader (struct casewriter *writer UNUSED,
   return reader;
 }
 
-static struct casewriter_class casewriter_translator_class =
+static const struct casewriter_class casewriter_translator_class =
   {
     casewriter_translator_write,
     casewriter_translator_destroy,