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   1 #include <string.h>
   2 #include "config.h"
   3
   4 /**
   5  * strset - an ordered set of strings
   6  *
   7  * This code implements an ordered set of string as a critbit tree. See:
   8  *
   9  *  http://cr.yp.to/critbit.html
  10  *  http://github.com/agl/critbit (which this code is based on)
  11  *
  12  * Note that ccan/htable is faster and uses less memory, but doesn't provide
  13  * ordered or prefix operations.
  14  *
  15  * Example:
  16  *      // Print all words in order.
  17  *      #include <ccan/strset/strset.h>
  18  *      #include <ccan/tal/grab_file/grab_file.h>
  19  *      #include <err.h>
  20  *      #include <string.h>
  21  *
  22  *      static bool dump(const char *member, void *unused)
  23  *      {
  24  *              printf("%s ", member);
  25  *              return true; // Keep going with iteration.
  26  *      }
  27  *
  28  *      int main(void)
  29  *      {
  30  *              struct strset words;
  31  *              char *file, *word;
  32  *
  33  *              strset_init(&words);
  34  *              file = grab_fd(NULL, 0);
  35  *              if (!file)
  36  *                      err(1, "Reading stdin");
  37  *
  38  *              for (word = strtok(file, " \t\r\n");
  39  *                   word;
  40  *                   word = strtok(NULL, " \t\r\n")) {
  41  *                      strset_add(&words, word);
  42  *              }
  43  *              strset_iterate(&words, dump, NULL);
  44  *              printf("\n");
  45  *              return 0;
  46  *      }
  47  *      // Given "foo bar" outputs "bar foo "
  48  *      // Given "foo foo bar" outputs "bar foo "
  49  *
  50  * License: CC0 (but some dependencies are LGPL!)
  51  * Author: Rusty Russell <rusty@rustcorp.com.au>
  52  * Ccanlint:
  53  *      license_depends_compat FAIL
  54  */
  55 int main(int argc, char *argv[])
  56 {
  57         /* Expect exactly one argument */
  58         if (argc != 2)
  59                 return 1;
  60
  61         if (strcmp(argv[1], "depends") == 0) {
  62                 printf("ccan/ilog\n"
  63                        "ccan/likely\n"
  64                        "ccan/short_types\n"
  65                        "ccan/str\n"
  66                        "ccan/typesafe_cb\n");
  67                 return 0;
  68         }
  69
  70         return 1;
  71 }