zutil/sortspec.c

   1 /*
   2  * Copyright (c) 1995-2001, Index Data.
   3  * See the file LICENSE for details.
   4  *
   5  * $Id: sortspec.c,v 1.2 2001-08-10 12:50:40 adam Exp $
   6  */
   7
   8 #include <stdio.h>
   9 #include <string.h>
  10 #include <stdlib.h>
  11
  12 #include <yaz/proto.h>
  13 #include <yaz/oid.h>
  14 #include <yaz/sortspec.h>
  15
  16 Z_SortKeySpecList *yaz_sort_spec (ODR out, const char *arg)
  17 {
  18     int oid[OID_SIZE];
  19     oident bib1;
  20     char sort_string_buf[32], sort_flags[32];
  21     Z_SortKeySpecList *sksl = (Z_SortKeySpecList *)
  22         odr_malloc (out, sizeof(*sksl));
  23     int off;
  24
  25     sksl->num_specs = 0;
  26     sksl->specs = (Z_SortKeySpec **)odr_malloc (out, sizeof(sksl->specs) * 20);
  27
  28     bib1.proto = PROTO_Z3950;
  29     bib1.oclass = CLASS_ATTSET;
  30     bib1.value = VAL_BIB1;
  31     while ((sscanf (arg, "%31s %31s%n", sort_string_buf,
  32                     sort_flags, &off)) == 2  && off > 1)
  33     {
  34         int i;
  35         char *sort_string_sep;
  36         char *sort_string = sort_string_buf;
  37         Z_SortKeySpec *sks = (Z_SortKeySpec *)odr_malloc (out, sizeof(*sks));
  38         Z_SortKey *sk = (Z_SortKey *)odr_malloc (out, sizeof(*sk));
  39
  40         arg += off;
  41         sksl->specs[sksl->num_specs++] = sks;
  42         sks->sortElement = (Z_SortElement *)
  43             odr_malloc (out, sizeof(*sks->sortElement));
  44         sks->sortElement->which = Z_SortElement_generic;
  45         sks->sortElement->u.generic = sk;
  46
  47         if ((sort_string_sep = strchr (sort_string, '=')))
  48         {
  49             int i = 0;
  50             sk->which = Z_SortKey_sortAttributes;
  51             sk->u.sortAttributes = (Z_SortAttributes *)
  52                 odr_malloc (out, sizeof(*sk->u.sortAttributes));
  53             sk->u.sortAttributes->id = oid_ent_to_oid(&bib1, oid);
  54             sk->u.sortAttributes->list = (Z_AttributeList *)
  55                 odr_malloc (out, sizeof(*sk->u.sortAttributes->list));
  56             sk->u.sortAttributes->list->attributes = (Z_AttributeElement **)
  57                 odr_malloc (out, 10 *
  58                             sizeof(*sk->u.sortAttributes->list->attributes));
  59             while (i < 10 && sort_string && sort_string_sep)
  60             {
  61                 Z_AttributeElement *el = (Z_AttributeElement *)
  62                     odr_malloc (out, sizeof(*el));
  63                 sk->u.sortAttributes->list->attributes[i] = el;
  64                 el->attributeSet = 0;
  65                 el->attributeType = odr_intdup (out, atoi (sort_string));
  66                 el->which = Z_AttributeValue_numeric;
  67                 el->value.numeric =
  68                     odr_intdup (out, atoi (sort_string_sep + 1));
  69                 i++;
  70                 sort_string = strchr(sort_string, ',');
  71                 if (sort_string)
  72                 {
  73                     sort_string++;
  74                     sort_string_sep = strchr (sort_string, '=');
  75                 }
  76             }
  77             sk->u.sortAttributes->list->num_attributes = i;
  78         }
  79         else
  80         {
  81             sk->which = Z_SortKey_sortField;
  82             sk->u.sortField = odr_strdup (out, sort_string);
  83         }
  84         sks->sortRelation = odr_intdup (out, Z_SortRelation_ascending);
  85         sks->caseSensitivity = odr_intdup (out, Z_SortCase_caseSensitive);
  86
  87 #ifdef ASN_COMPILED
  88         sks->which = Z_SortKeySpec_null;
  89         sks->u.null = odr_nullval ();
  90 #else
  91         sks->missingValueAction = NULL;
  92 #endif
  93
  94         for (i = 0; sort_flags[i]; i++)
  95         {
  96             switch (sort_flags[i])
  97             {
  98             case 'd':
  99             case 'D':
 100             case '>':
 101                 *sks->sortRelation = Z_SortRelation_descending;
 102                 break;
 103             case 'a':
 104             case 'A':
 105             case '<':
 106                 *sks->sortRelation = Z_SortRelation_ascending;
 107                 break;
 108             case 'i':
 109             case 'I':
 110                 *sks->caseSensitivity = Z_SortCase_caseInsensitive;
 111                 break;
 112             case 'S':
 113             case 's':
 114                 *sks->caseSensitivity = Z_SortCase_caseSensitive;
 115                 break;
 116             }
 117         }
 118     }
 119     if (!sksl->num_specs)
 120         return 0;
 121     return sksl;
 122 }