git.ozlabs.org Git - ccan/blob - ccan/tdb2/_info

   1 #include <string.h>
   2 #include <stdio.h>
   3
   4 /**
   5  * tdb2 - [[WORK IN PROGRESS!]] The trivial (64bit transactional) database
   6  *
   7  * The tdb2 module provides an efficient keyword data mapping (usually
   8  * within a file).  It supports transactions, so the contents of the
   9  * database is reliable even across crashes.
  10  *
  11  * Example:
  12  *      #include <ccan/tdb2/tdb2.h>
  13  *      #include <ccan/str/str.h>
  14  *      #include <err.h>
  15  *      #include <stdio.h>
  16  *
  17  *      static void usage(const char *argv0)
  18  *      {
  19  *              errx(1, "Usage: %s fetch <dbfile> <key>\n"
  20  *                   "OR %s store <dbfile> <key> <data>", argv0, argv0);
  21  *      }
  22  *
  23  *      int main(int argc, char *argv[])
  24  *      {
  25  *              struct tdb_context *tdb;
  26  *              TDB_DATA key, value;
  27  *
  28  *              if (argc < 4)
  29  *                      usage(argv[0]);
  30  *
  31  *              tdb = tdb_open(argv[2], TDB_DEFAULT, O_CREAT|O_RDWR,0600, NULL);
  32  *              if (!tdb)
  33  *                      err(1, "Opening %s", argv[2]);
  34  *
  35  *              key.dptr = (void *)argv[3];
  36  *              key.dsize = strlen(argv[3]);
  37  *
  38  *              if (streq(argv[1], "fetch")) {
  39  *                      if (argc != 4)
  40  *                              usage(argv[0]);
  41  *                      value = tdb_fetch(tdb, key);
  42  *                      if (!value.dptr)
  43  *                              errx(1, "fetch %s: %s",
  44  *                                   argv[3], tdb_errorstr(tdb));
  45  *                      printf("%.*s\n", value.dsize, (char *)value.dptr);
  46  *                      free(value.dptr);
  47  *              } else if (streq(argv[1], "store")) {
  48  *                      if (argc != 5)
  49  *                              usage(argv[0]);
  50  *                      value.dptr = (void *)argv[4];
  51  *                      value.dsize = strlen(argv[4]);
  52  *                      if (tdb_store(tdb, key, value, 0) != 0)
  53  *                              errx(1, "store %s: %s",
  54  *                                   argv[3], tdb_errorstr(tdb));
  55  *              } else
  56  *                      usage(argv[0]);
  57  *
  58  *              return 0;
  59  *      }
  60  *
  61  * Maintainer: Rusty Russell <rusty@rustcorp.com.au>
  62  *
  63  * Author: Rusty Russell
  64  *
  65  * License: LGPLv3 (or later)
  66  *
  67  * Ccanlint:
  68  *      // hash fails because it accesses data in 4 byte quantities for speed.
  69  *      valgrind-tests --partial-loads-ok=yes
  70  */
  71 int main(int argc, char *argv[])
  72 {
  73         if (argc != 2)
  74                 return 1;
  75
  76         if (strcmp(argv[1], "depends") == 0) {
  77                 printf("ccan/hash\n");
  78                 printf("ccan/likely\n");
  79                 printf("ccan/asearch\n");
  80                 printf("ccan/compiler\n");
  81                 printf("ccan/build_assert\n");
  82                 printf("ccan/ilog\n");
  83                 printf("ccan/tally\n");
  84                 return 0;
  85         }
  86
  87         return 1;
  88 }