Browse Source Download (without any required ccan dependencies)

Module:

asort

Summary:

typesafe array sort (qsort)

Author:

Rusty Russell <rusty@rustcorp.com.au>

Dependencies:

Description:

qsort() is the standard routine for sorting an array of objects. Unfortunately, it has two problems: 

    1) It isn't typesafe,
    2) The comparison function doesn't take a context pointer.

asort does both.

Example:

#include <ccan/asort/asort.h>
#include <stdio.h>
#include <string.h>

static int cmp(char *const *a, char *const *n, bool *casefold)
{
        if (*casefold)
                return strcasecmp(*a, *n);
        else
                return strcmp(*a, *n);
}

int main(int argc, char *argv[])
{
        bool casefold = false;
        unsigned int i;

        if (argc < 2) {
                fprintf(stderr, "Usage: %s [-i] <list>...\n"
                        "Sort arguments (-i = ignore case)\n",
                        argv[0]);
                exit(1);
        }

        if (strcmp(argv[1], "-i") == 0) {
                casefold = true;
                argc--;
                argv++;
        }
        asort(&argv[1], argc-1, cmp, &casefold);
        for (i = 1; i < argc; i++)
                printf("%s ", argv[i]);
        printf("\n");
        return 0;
}

License:

LGPL (v2.1 or any later version)