ext/GDBM_File/GDBM_File.xs

   1 #define PERL_NO_GET_CONTEXT
   2
   3 #include "EXTERN.h"
   4 #include "perl.h"
   5 #include "XSUB.h"
   6
   7 #include <gdbm.h>
   8 #include <fcntl.h>
   9
  10 #define fetch_key 0
  11 #define store_key 1
  12 #define fetch_value 2
  13 #define store_value 3
  14
  15 typedef struct {
  16         GDBM_FILE       dbp ;
  17         SV *    filter[4];
  18         int     filtering ;
  19         } GDBM_File_type;
  20
  21 typedef GDBM_File_type * GDBM_File ;
  22 typedef datum datum_key ;
  23 typedef datum datum_value ;
  24 typedef datum datum_key_copy;
  25
  26 #define GDBM_BLOCKSIZE 0 /* gdbm defaults to stat blocksize */
  27
  28 typedef void (*FATALFUNC)();
  29
  30 #ifndef GDBM_FAST
  31 static int
  32 not_here(char *s)
  33 {
  34     croak("GDBM_File::%s not implemented on this architecture", s);
  35     return -1;
  36 }
  37 #endif
  38
  39 /* GDBM allocates the datum with system malloc() and expects the user
  40  * to free() it.  So we either have to free() it immediately, or have
  41  * perl free() it when it deallocates the SV, depending on whether
  42  * perl uses malloc()/free() or not. */
  43 static void
  44 output_datum(pTHX_ SV *arg, char *str, int size)
  45 {
  46         sv_setpvn(arg, str, size);
  47 #       undef free
  48         free(str);
  49 }
  50
  51 /* Versions of gdbm prior to 1.7x might not have the gdbm_sync,
  52    gdbm_exists, and gdbm_setopt functions.  Apparently Slackware
  53    (Linux) 2.1 contains gdbm-1.5 (which dates back to 1991).
  54 */
  55 #ifndef GDBM_FAST
  56 #define gdbm_exists(db,key) not_here("gdbm_exists")
  57 #define gdbm_sync(db) (void) not_here("gdbm_sync")
  58 #define gdbm_setopt(db,optflag,optval,optlen) not_here("gdbm_setopt")
  59 #endif
  60
  61 #include "const-c.inc"
  62
  63 MODULE = GDBM_File      PACKAGE = GDBM_File     PREFIX = gdbm_
  64
  65 INCLUDE: const-xs.inc
  66
  67 GDBM_File
  68 gdbm_TIEHASH(dbtype, name, read_write, mode, fatal_func = (FATALFUNC)croak)
  69         char *          dbtype
  70         char *          name
  71         int             read_write
  72         int             mode
  73         FATALFUNC       fatal_func
  74         CODE:
  75         {
  76             GDBM_FILE   dbp ;
  77
  78             RETVAL = NULL ;
  79             if ((dbp =  gdbm_open(name, GDBM_BLOCKSIZE, read_write, mode, fatal_func))) {
  80                 RETVAL = (GDBM_File)safecalloc(1, sizeof(GDBM_File_type)) ;
  81                 RETVAL->dbp = dbp ;
  82             }
  83
  84         }
  85         OUTPUT:
  86           RETVAL
  87
  88
  89 #define gdbm_close(db)                  gdbm_close(db->dbp)
  90 void
  91 gdbm_close(db)
  92         GDBM_File       db
  93         CLEANUP:
  94
  95 void
  96 gdbm_DESTROY(db)
  97         GDBM_File       db
  98         PREINIT:
  99         int i = store_value;
 100         CODE:
 101         gdbm_close(db);
 102         do {
 103             if (db->filter[i])
 104                 SvREFCNT_dec(db->filter[i]);
 105         } while (i-- > 0);
 106         safefree(db);
 107
 108 #define gdbm_FETCH(db,key)                      gdbm_fetch(db->dbp,key)
 109 datum_value
 110 gdbm_FETCH(db, key)
 111         GDBM_File       db
 112         datum_key_copy  key
 113
 114 #define gdbm_STORE(db,key,value,flags)          gdbm_store(db->dbp,key,value,flags)
 115 int
 116 gdbm_STORE(db, key, value, flags = GDBM_REPLACE)
 117         GDBM_File       db
 118         datum_key       key
 119         datum_value     value
 120         int             flags
 121     CLEANUP:
 122         if (RETVAL) {
 123             if (RETVAL < 0 && errno == EPERM)
 124                 croak("No write permission to gdbm file");
 125             croak("gdbm store returned %d, errno %d, key \"%.*s\"",
 126                         RETVAL,errno,key.dsize,key.dptr);
 127         }
 128
 129 #define gdbm_DELETE(db,key)                     gdbm_delete(db->dbp,key)
 130 int
 131 gdbm_DELETE(db, key)
 132         GDBM_File       db
 133         datum_key       key
 134
 135 #define gdbm_FIRSTKEY(db)                       gdbm_firstkey(db->dbp)
 136 datum_key
 137 gdbm_FIRSTKEY(db)
 138         GDBM_File       db
 139
 140 #define gdbm_NEXTKEY(db,key)                    gdbm_nextkey(db->dbp,key)
 141 datum_key
 142 gdbm_NEXTKEY(db, key)
 143         GDBM_File       db
 144         datum_key       key
 145
 146 #define gdbm_reorganize(db)                     gdbm_reorganize(db->dbp)
 147 int
 148 gdbm_reorganize(db)
 149         GDBM_File       db
 150
 151
 152 #define gdbm_sync(db)                           gdbm_sync(db->dbp)
 153 void
 154 gdbm_sync(db)
 155         GDBM_File       db
 156
 157 #define gdbm_EXISTS(db,key)                     gdbm_exists(db->dbp,key)
 158 int
 159 gdbm_EXISTS(db, key)
 160         GDBM_File       db
 161         datum_key       key
 162
 163 #define gdbm_setopt(db,optflag, optval, optlen) gdbm_setopt(db->dbp,optflag, optval, optlen)
 164 int
 165 gdbm_setopt (db, optflag, optval, optlen)
 166         GDBM_File       db
 167         int             optflag
 168         int             &optval
 169         int             optlen
 170
 171
 172 SV *
 173 filter_fetch_key(db, code)
 174         GDBM_File       db
 175         SV *            code
 176         SV *            RETVAL = &PL_sv_undef ;
 177         ALIAS:
 178         GDBM_File::filter_fetch_key = fetch_key
 179         GDBM_File::filter_store_key = store_key
 180         GDBM_File::filter_fetch_value = fetch_value
 181         GDBM_File::filter_store_value = store_value
 182         CODE:
 183             DBM_setFilter(db->filter[ix], code);