ext/GDBM_File/GDBM_File.xs

   1 #include "EXTERN.h"
   2 #include "perl.h"
   3 #include "XSUB.h"
   4
   5 #include <gdbm.h>
   6 #include <fcntl.h>
   7
   8 typedef struct {
   9         GDBM_FILE       dbp ;
  10         SV *    filter_fetch_key ;
  11         SV *    filter_store_key ;
  12         SV *    filter_fetch_value ;
  13         SV *    filter_store_value ;
  14         int     filtering ;
  15         } GDBM_File_type;
  16
  17 typedef GDBM_File_type * GDBM_File ;
  18 typedef datum datum_key ;
  19 typedef datum datum_value ;
  20 typedef datum datum_key_copy;
  21
  22 #define GDBM_BLOCKSIZE 0 /* gdbm defaults to stat blocksize */
  23
  24 typedef void (*FATALFUNC)();
  25
  26 #ifndef GDBM_FAST
  27 static int
  28 not_here(char *s)
  29 {
  30     croak("GDBM_File::%s not implemented on this architecture", s);
  31     return -1;
  32 }
  33 #endif
  34
  35 /* GDBM allocates the datum with system malloc() and expects the user
  36  * to free() it.  So we either have to free() it immediately, or have
  37  * perl free() it when it deallocates the SV, depending on whether
  38  * perl uses malloc()/free() or not. */
  39 static void
  40 output_datum(pTHX_ SV *arg, char *str, int size)
  41 {
  42         sv_setpvn(arg, str, size);
  43 #       undef free
  44         free(str);
  45 }
  46
  47 /* Versions of gdbm prior to 1.7x might not have the gdbm_sync,
  48    gdbm_exists, and gdbm_setopt functions.  Apparently Slackware
  49    (Linux) 2.1 contains gdbm-1.5 (which dates back to 1991).
  50 */
  51 #ifndef GDBM_FAST
  52 #define gdbm_exists(db,key) not_here("gdbm_exists")
  53 #define gdbm_sync(db) (void) not_here("gdbm_sync")
  54 #define gdbm_setopt(db,optflag,optval,optlen) not_here("gdbm_setopt")
  55 #endif
  56
  57 #include "const-c.inc"
  58
  59 MODULE = GDBM_File      PACKAGE = GDBM_File     PREFIX = gdbm_
  60
  61 INCLUDE: const-xs.inc
  62
  63 GDBM_File
  64 gdbm_TIEHASH(dbtype, name, read_write, mode, fatal_func = (FATALFUNC)croak)
  65         char *          dbtype
  66         char *          name
  67         int             read_write
  68         int             mode
  69         FATALFUNC       fatal_func
  70         CODE:
  71         {
  72             GDBM_FILE   dbp ;
  73
  74             RETVAL = NULL ;
  75             if ((dbp =  gdbm_open(name, GDBM_BLOCKSIZE, read_write, mode, fatal_func))) {
  76                 RETVAL = (GDBM_File)safemalloc(sizeof(GDBM_File_type)) ;
  77                 Zero(RETVAL, 1, GDBM_File_type) ;
  78                 RETVAL->dbp = dbp ;
  79             }
  80
  81         }
  82         OUTPUT:
  83           RETVAL
  84
  85
  86 #define gdbm_close(db)                  gdbm_close(db->dbp)
  87 void
  88 gdbm_close(db)
  89         GDBM_File       db
  90         CLEANUP:
  91
  92 void
  93 gdbm_DESTROY(db)
  94         GDBM_File       db
  95         CODE:
  96         gdbm_close(db);
  97         safefree(db);
  98
  99 #define gdbm_FETCH(db,key)                      gdbm_fetch(db->dbp,key)
 100 datum_value
 101 gdbm_FETCH(db, key)
 102         GDBM_File       db
 103         datum_key_copy  key
 104
 105 #define gdbm_STORE(db,key,value,flags)          gdbm_store(db->dbp,key,value,flags)
 106 int
 107 gdbm_STORE(db, key, value, flags = GDBM_REPLACE)
 108         GDBM_File       db
 109         datum_key       key
 110         datum_value     value
 111         int             flags
 112     CLEANUP:
 113         if (RETVAL) {
 114             if (RETVAL < 0 && errno == EPERM)
 115                 croak("No write permission to gdbm file");
 116             croak("gdbm store returned %d, errno %d, key \"%.*s\"",
 117                         RETVAL,errno,key.dsize,key.dptr);
 118         }
 119
 120 #define gdbm_DELETE(db,key)                     gdbm_delete(db->dbp,key)
 121 int
 122 gdbm_DELETE(db, key)
 123         GDBM_File       db
 124         datum_key       key
 125
 126 #define gdbm_FIRSTKEY(db)                       gdbm_firstkey(db->dbp)
 127 datum_key
 128 gdbm_FIRSTKEY(db)
 129         GDBM_File       db
 130
 131 #define gdbm_NEXTKEY(db,key)                    gdbm_nextkey(db->dbp,key)
 132 datum_key
 133 gdbm_NEXTKEY(db, key)
 134         GDBM_File       db
 135         datum_key       key
 136
 137 #define gdbm_reorganize(db)                     gdbm_reorganize(db->dbp)
 138 int
 139 gdbm_reorganize(db)
 140         GDBM_File       db
 141
 142
 143 #define gdbm_sync(db)                           gdbm_sync(db->dbp)
 144 void
 145 gdbm_sync(db)
 146         GDBM_File       db
 147
 148 #define gdbm_EXISTS(db,key)                     gdbm_exists(db->dbp,key)
 149 int
 150 gdbm_EXISTS(db, key)
 151         GDBM_File       db
 152         datum_key       key
 153
 154 #define gdbm_setopt(db,optflag, optval, optlen) gdbm_setopt(db->dbp,optflag, optval, optlen)
 155 int
 156 gdbm_setopt (db, optflag, optval, optlen)
 157         GDBM_File       db
 158         int             optflag
 159         int             &optval
 160         int             optlen
 161
 162
 163 SV *
 164 filter_fetch_key(db, code)
 165         GDBM_File       db
 166         SV *            code
 167         SV *            RETVAL = &PL_sv_undef ;
 168         CODE:
 169             DBM_setFilter(db->filter_fetch_key, code) ;
 170
 171 SV *
 172 filter_store_key(db, code)
 173         GDBM_File       db
 174         SV *            code
 175         SV *            RETVAL =  &PL_sv_undef ;
 176         CODE:
 177             DBM_setFilter(db->filter_store_key, code) ;
 178
 179 SV *
 180 filter_fetch_value(db, code)
 181         GDBM_File       db
 182         SV *            code
 183         SV *            RETVAL =  &PL_sv_undef ;
 184         CODE:
 185             DBM_setFilter(db->filter_fetch_value, code) ;
 186
 187 SV *
 188 filter_store_value(db, code)
 189         GDBM_File       db
 190         SV *            code
 191         SV *            RETVAL =  &PL_sv_undef ;
 192         CODE:
 193             DBM_setFilter(db->filter_store_value, code) ;
 194