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/**
* util_prg_example - Example program for util_prg
*
* Copyright IBM Corp. 2016, 2017
*
* s390-tools is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See LICENSE for details.
*/
//! [code]
#include <getopt.h>
#include <stdlib.h>
#include "lib/util_prg.h"
/*
* Program description
*/
const struct util_prg prg = {
.desc = "Sample for util_prg library.",
.args = "[POS_ARGS]",
.copyright_vec = {
{
.owner = "IBM Corp.",
.pub_first = 2001,
.pub_last = 2017,
},
{
.owner = "Another Corp.",
.pub_first = 2017,
.pub_last = 2017,
},
UTIL_PRG_COPYRIGHT_END
}
};
static const struct option opt_list[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, 'v' },
{ NULL, no_argument, NULL, 0 },
};
/*
* Demonstrate the util_prg_print() functions
*/
int main(int argc, char *argv[])
{
const char *file_name = "i_do_not_exist";
char optopt_str[3];
FILE *fp;
int opt;
/* Disable the getopt_long() error messages */
opterr = 0;
util_prg_init(&prg);
while ((opt = getopt_long(argc, argv, "vhe", opt_list, NULL)) != -1) {
switch (opt) {
case 'v':
util_prg_print_version();
return EXIT_SUCCESS;
case 'h':
util_prg_print_help();
printf(" -e Try to open non-exisiting file\n");
printf(" -h Print this help, then exit\n");
printf(" -v Print version information, then exit\n");
return EXIT_SUCCESS;
case 'e':
fp = fopen(file_name, "r");
if (!fp) {
err(EXIT_FAILURE, "Open of '%s' failed",
file_name);
}
return EXIT_SUCCESS;
case ':':
/* Option requires an argument */
util_prg_print_required_arg(argv[optind - 1]);
return EXIT_FAILURE;
case '?':
sprintf(optopt_str, "-%c", optopt);
util_prg_print_invalid_option(optopt_str);
return EXIT_FAILURE;
}
}
if (argc > 2) {
util_prg_print_arg_error(argv[2]);
return EXIT_FAILURE;
}
if (argc == 2) {
printf("Positional parameter specified: %s\n", argv[1]);
return EXIT_SUCCESS;
}
errx(EXIT_FAILURE, "Specify either -h, -v, -e, or one positional "
"parameter");
}
//! [code]
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