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   1 #include <stdio.h>
   2 #include <string.h>
   3
   4 /**
   5  * asort - typesafe array sort (qsort)
   6  *
   7  * qsort() is the standard routine for sorting an array of objects.
   8  * Unfortunately, it has two problems:
   9  *     1) It isn't typesafe,
  10  *     2) The comparison function doesn't take a context pointer.
  11  *
  12  * asort does both.
  13  *
  14  * License: LGPL (v2.1 or any later version)
  15  * Author: Rusty Russell <rusty@rustcorp.com.au>
  16  *
  17  * Example:
  18  *      #include <ccan/asort/asort.h>
  19  *      #include <stdio.h>
  20  *      #include <string.h>
  21  *
  22  *      static int cmp(char *const *a, char *const *n, bool *casefold)
  23  *      {
  24  *              if (*casefold)
  25  *                      return strcasecmp(*a, *n);
  26  *              else
  27  *                      return strcmp(*a, *n);
  28  *      }
  29  *
  30  *      int main(int argc, char *argv[])
  31  *      {
  32  *              bool casefold = false;
  33  *              unsigned int i;
  34  *
  35  *              if (argc < 2) {
  36  *                      fprintf(stderr, "Usage: %s [-i] <list>...\n"
  37  *                              "Sort arguments (-i = ignore case)\n",
  38  *                              argv[0]);
  39  *                      exit(1);
  40  *              }
  41  *
  42  *              if (strcmp(argv[1], "-i") == 0) {
  43  *                      casefold = true;
  44  *                      argc--;
  45  *                      argv++;
  46  *              }
  47  *              asort(&argv[1], argc-1, cmp, &casefold);
  48  *              for (i = 1; i < argc; i++)
  49  *                      printf("%s ", argv[i]);
  50  *              printf("\n");
  51  *              return 0;
  52  *      }
  53  */
  54 int main(int argc, char *argv[])
  55 {
  56         if (argc != 2)
  57                 return 1;
  58
  59         if (strcmp(argv[1], "depends") == 0) {
  60                 printf("ccan/typesafe_cb\n");
  61                 printf("ccan/array_size\n");
  62                 return 0;
  63         }
  64
  65         return 1;
  66 }