add bta_print_header

bta_print_header/cmdlnopts.c

@@ -0,0 +1,76 @@
+/*
+ * This file is part of the btaprinthdr project.
+ * Copyright 2022 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+#include <strings.h>
+#include <limits.h>
+
+#include "cmdlnopts.h"
+
+/*
+ * here are global parameters initialisation
+ */
+static int help;
+static glob_pars  G;
+
+//            DEFAULTS
+// default global parameters
+glob_pars const Gdefault = {
+    .refresh = 0.5,
+    .pidfile = "/tmp/bta_print_header.pid"
+};
+
+/*
+ * Define command line options by filling structure:
+ *  name    has_arg flag    val     type        argptr          help
+*/
+myoption cmdlnopts[] = {
+    {"help",    NO_ARGS,    NULL,   'h', arg_none,      APTR(&help),        N_("show this help")},
+    {"out",     NEED_ARG,   NULL,   'o', arg_string,    APTR(&G.outfile),   N_("output file name")},
+    {"refresh", NEED_ARG,   NULL,   'r', arg_double,    APTR(&G.refresh),   N_("refresh rate (0.1-30s; default: 0.5)")},
+    {"pidfile", NEED_ARG,   NULL,   'p', arg_string,    APTR(&G.pidfile),   N_("PID file name")},
+    end_option
+};
+
+
+/**
+ * Parse command line options and return dynamically allocated structure
+ *      to global parameters
+ * @param argc - copy of argc from main
+ * @param argv - copy of argv from main
+ * @return allocated structure with global parameters
+ */
+glob_pars *parse_args(int argc, char **argv){
+    void *ptr;
+    ptr = memcpy(&G, &Gdefault, sizeof(G)); assert(ptr);
+    // parse arguments
+    parseargs(&argc, &argv, cmdlnopts);
+    if(help) showhelp(-1, cmdlnopts);
+    if(argc > 0){
+        G.outfile = strdup(argv[0]);
+        if(argc > 1){
+            WARNX("%d unused parameters:\n", argc - 1);
+            for(int i = 1; i < argc; ++i)
+                printf("\t%4d: %s\n", i, argv[i]);
+        }
+    }
+    return &G;
+}
+