/** * apr tutorial sample code * http://dev.ariel-networks.com/apr/ */#ifdef HAVE_CONFIG_H#include <config.h>#endif#include <stdio.h>#include <stdlib.h>#include <assert.h>#include <apr_general.h>#include <apr_getopt.h>/** * command line options sample code * @remark Error checks omitted */int main(int argc, const char *argv[]){    apr_status_t rv;    apr_pool_t *mp;    /* API is data structure driven */    static const apr_getopt_option_t opt_option[] = {        /* long-option, short-option, has-arg flag, description */        { "in", 'i', TRUE, "input file" },      /* -i name or --in name */        { "out", 'o', TRUE, "output file" },    /* -o name or --out name */        { "help", 'h', FALSE, "show help" },    /* -h or --help */        { NULL, 0, 0, NULL }, /* end (a.k.a. sentinel) */    };    apr_getopt_t *opt;    int optch;    const char *optarg;            apr_initialize();    apr_pool_create(&mp, NULL);    /* initialize apr_getopt_t */    apr_getopt_init(&opt, mp, argc, argv);    /* parse the all options based on opt_option[] */    while ((rv = apr_getopt_long(opt, opt_option, &optch, &optarg)) == APR_SUCCESS) {        switch (optch) {        case 'i':            printf("opt=i, %s\n", optarg);            break;        case 'o':            printf("opt=o, %s\n", optarg);            break;        case 'h':            printf("show help\n");  /* no arg */            break;        }    }    if (rv != APR_EOF) {        printf("bad options\n");    }    apr_terminate();    return 0;}