122 lines
4.0 KiB
C
122 lines
4.0 KiB
C
/* ************************************************************************** */
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/* _____ _ */
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/* p7screen/args.c |_ _|__ _ _| |__ ___ _ _ */
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/* | Project: p7utils | |/ _ \| | | | '_ \ / _ \ | | | */
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/* | | (_) | |_| | | | | __/ |_| | */
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/* By: thomas <thomas@touhey.fr> |_|\___/ \__,_|_| |_|\___|\__, |.fr */
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/* Last updated: 2017/01/16 23:55:55 |___/ */
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/* */
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/* ************************************************************************** */
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#include "main.h"
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#include <stdlib.h>
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#include <ctype.h>
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#include <getopt.h>
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/* ************************************************************************** */
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/* Help and version messages */
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/* ************************************************************************** */
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/* Version message */
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static const char version_message[] =
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QUOTE(BIN) " - from " QUOTE(NAME) " v" QUOTE(VERSION) " (licensed under GPLv2)\n"
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"Maintained by " QUOTE(MAINTAINER) ".\n"
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"\n"
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"This is free software; see the source for copying conditions.\n"
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"There is NO warranty; not even for MERCHANTABILITY or\n"
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"FITNESS FOR A PARTICULAR PURPOSE.";
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/* Help message */
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static const char help_main[] =
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"Usage: " QUOTE(BIN) " [--help|-h] [--version|-v]\n"
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" [--com <device>]\n"
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"\n"
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"Displays the streamed screen from a CASIO fx calculator.\n"
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"\n"
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"Options are:\n"
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" -h, --help Display this help page\n"
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" -v, --version Displays the version\n"
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" --com <device> The serial device, if you want to communicate with a\n"
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" calculator connected using a USB-to-serial cable.\n"
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" If this option isn't used, the program will look for a\n"
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" calculator connected using direct USB.\n"
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" -z ZOOM Change the zoom (1 to 16)\n"
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" By default, the zoom will be " QUOTE(DEFAULT_ZOOM) ".\n"
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"\n"
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"Report bugs to " QUOTE(MAINTAINER) ".";
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/* ************************************************************************** */
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/* Main function */
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/* ************************************************************************** */
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/**
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* parse_args:
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* Args parsing main function.
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*
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* Inspired of the edits of my first experiment with getopt.
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* Interesting, huh?
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*
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* @arg ac the arguments count
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* @arg av the arguments values
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* @arg device pointer to the device
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* @arg zoom pointer the zoom
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* @arg args the parsed args pointer
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* @return 0 if ok, other if not.
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*/
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int parse_args(int ac, char **av, const char **com, int *zoom)
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{
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/* initialize args */
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*com = 0;
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*zoom = DEFAULT_ZOOM;
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/* define options */
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const char short_options[] = "hvz:";
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const struct option long_options[] = {
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{"help", no_argument, NULL, 'h'},
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{"version", no_argument, NULL, 'v'},
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{"com", required_argument, NULL, 'c'},
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{"zoom", required_argument, NULL, 'z'},
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{NULL, 0, NULL, 0}
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};
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/* get all options */
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int c; opterr = 0;
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int help = 0, version = 0;
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while ((c = getopt_long(ac, av, short_options, long_options, NULL)) != -1) {
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switch (c) {
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/* help */
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case 'h': help = 1; break;
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/* version */
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case 'v': version = 1; break;
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/* com port */
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case 'c': *com = optarg; break;
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/* zoom */
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case 'z':
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*zoom = atoi(optarg);
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if (*zoom <= 0 || *zoom > 16) {
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log("-z, --zoom: should be between 1 and 16");
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return (1);
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}
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break;
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/* error (ignore) */
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case '?':
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if (optopt == 'z')
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log("-z, --zoom: expected an argument\n");
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else if (optopt == 'c')
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log("--com: expected an argument\n");
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else
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break;
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return (1);
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}
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}
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/* check if there is any parameter */
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if (ac - optind)
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help = 1;
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/* print help or version if required, and return */
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if (version) puts(version_message);
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else if (help) puts(help_main);
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else return (0);
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return (1);
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}
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