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https://github.com/eddyem/eddys_snippets.git
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98 lines
3.5 KiB
C
98 lines
3.5 KiB
C
/*
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* This file is part of the opengl project.
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* Copyright 2020 Edward V. Emelianov <edward.emelianoff@gmail.com>.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <assert.h>
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#include <math.h>
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#include <stdio.h>
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#include <string.h>
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#include <strings.h>
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#include <usefull_macros.h>
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#include "cmdlnopts.h"
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static int help;
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/*
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* here are global parameters initialisation
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*/
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int verbose_level;
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glob_pars G;
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// default PID filename:
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#define DEFAULT_PIDFILE "/tmp/opengl.pid"
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// DEFAULTS
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// default global parameters
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static glob_pars const Gdefault = {
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.device = NULL,
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.pidfile = DEFAULT_PIDFILE,
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.exptime = NAN,
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.gain = NAN
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};
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/*
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* Define command line options by filling structure:
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* name has_arg flag val type argptr help
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*/
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static myoption cmdlnopts[] = {
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// common options
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{"help", NO_ARGS, NULL, 'h', arg_int, APTR(&help), _("show this help")},
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{"device", NEED_ARG, NULL, 'd', arg_string, APTR(&G.device), _("camera device name")},
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{"pidfile", NEED_ARG, NULL, 'P', arg_string, APTR(&G.pidfile), _("pidfile (default: " DEFAULT_PIDFILE ")")},
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{"verbose", NO_ARGS, NULL, 'v', arg_none, APTR(&verbose_level), _("verbose level (each 'v' increases it)")},
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{"camno", NEED_ARG, NULL, 'n', arg_int, APTR(&G.camno), _("camera number (if many connected)")},
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{"exptime", NEED_ARG, NULL, 'x', arg_float, APTR(&G.exptime), _("exposure time (ms)")},
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{"gain", NEED_ARG, NULL, 'g', arg_float, APTR(&G.gain), _("gain value (dB)")},
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{"display", NO_ARGS, NULL, 'D', arg_int, APTR(&G.showimage), _("display captured image")},
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{"nimages", NEED_ARG, NULL, 'N', arg_int, APTR(&G.nimages), _("number of images to capture")},
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{"png", NO_ARGS, NULL, 'p', arg_int, APTR(&G.save_png), _("save png too")},
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end_option
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};
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/**
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* Parse command line options and return dynamically allocated structure
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* to global parameters
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* @param argc - copy of argc from main
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* @param argv - copy of argv from main
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* @return allocated structure with global parameters
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*/
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glob_pars *parse_args(int argc, char **argv){
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int i;
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void *ptr;
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ptr = memcpy(&G, &Gdefault, sizeof(G)); assert(ptr);
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size_t hlen = 1024;
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char helpstring[1024], *hptr = helpstring;
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snprintf(hptr, hlen, "Usage: %%s [args] [filename prefix]\n\n\tWhere args are:\n");
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// format of help: "Usage: progname [args]\n"
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change_helpstring(helpstring);
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// parse arguments
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parseargs(&argc, &argv, cmdlnopts);
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if(help) showhelp(-1, cmdlnopts);
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if(argc > 0){
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G.rest_pars_num = argc;
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G.rest_pars = MALLOC(char *, argc);
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for (i = 0; i < argc; i++){
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DBG("Found free parameter %s", argv[i]);
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G.rest_pars[i] = strdup(argv[i]);
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}
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}
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return &G;
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}
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