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

   1 #include <string.h>
   2
   3 /**
   4  * tdb - The trivial (transactional) database
   5  *
   6  * The tdb module provides an efficient keyword data mapping (usually
   7  * within a file).  It supports transactions, so the contents of the
   8  * database is reliable even across crashes.
   9  *
  10  * Example:
  11  *      #include <ccan/tdb/tdb.h>
  12  *      #include <ccan/str/str.h>
  13  *      #include <err.h>
  14  *      #include <stdio.h>
  15  *
  16  *      static void usage(void)
  17  *      {
  18  *              errx(1, "Usage: %s fetch <dbfile> <key>\n"
  19  *                   "OR %s store <dbfile> <key> <data>");
  20  *      }
  21  *
  22  *      int main(int argc, char *argv[])
  23  *      {
  24  *              struct tdb_context *tdb;
  25  *              TDB_DATA key, value;
  26  *
  27  *              if (argc < 4)
  28  *                      usage();
  29  *
  30  *              tdb = tdb_open(argv[2], 1024, TDB_DEFAULT, O_CREAT|O_RDWR,
  31  *                              0600);
  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();
  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();
  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();
  57  *
  58  *              return 0;
  59  *      }
  60  *
  61  * Maintainer: Rusty Russell <rusty@rustcorp.com.au>
  62  *
  63  * Author: Andrew Tridgell, Jeremy Allison, Rusty Russell
  64  *
  65  * Licence: LGPLv3 (or later)
  66  */
  67 int main(int argc, char *argv[])
  68 {
  69         if (argc != 2)
  70                 return 1;
  71
  72         if (strcmp(argv[1], "depends") == 0)
  73                 return 0;
  74
  75         return 1;
  76 }