X-Git-Url: http://pileus.org/git/?p=~andy%2Fsfvlug;a=blobdiff_plain;f=c%2Fsrc%2Fopts.c;fp=c%2Fsrc%2Fopts.c;h=9fc0ae12fc33fcf0b5bac299967117cb010a3f6b;hp=0000000000000000000000000000000000000000;hb=bc60878f14313f857dedc9954f189f37528386b7;hpb=4d380e0b82a77240bc5859c13161e90128d15f0d

diff --git a/c/src/opts.c b/c/src/opts.c
new file mode 100644
index 0000000..9fc0ae1
--- /dev/null
+++ b/c/src/opts.c
@@ -0,0 +1,67 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <getopt.h>
+
+/* Options */
+static int   opt_verbose  = 0;
+static char *opt_greeting = "Hello";
+static char *opt_name     = "World";
+
+/* Parsing */
+static char *short_options = "hvg:n:";
+
+static struct option long_options[] = {
+	{"help",     0, NULL, 'h'},
+	{"verbose",  0, NULL, 'v'},
+	{"greeting", 1, NULL, 'g'},
+	{"name",     1, NULL, 'n'},
+};
+
+/* Show usage information */
+static void usage(int status)
+{
+	printf("opts -[OPTIONS]\n");
+	printf("\n");
+	printf("Options:\n");
+	printf("  -h,--help          Show usage information\n");
+	printf("  -v,--verbose       Print debug output messages\n");
+	printf("  -n,--greeting=STR  Use the given greeting\n");
+	printf("  -n,--name=NAME     Greet the given person\n");
+	exit(status);
+}
+
+/* Parse command line arguments */
+static void parse(int argc, char **argv)
+{
+	while (1) {
+		int c = getopt_long(argc, argv,
+				short_options, long_options, 0);
+		if (c == -1)
+			break;
+		switch (c) {
+			case 'h': usage(0);               break;
+			case 'v': opt_verbose   = 1;      break;
+			case 'g': opt_greeting  = optarg; break;
+			case 'n': opt_name      = optarg; break;
+			default:  usage(1);               break;
+		}
+	}
+	if (argc != optind)
+		usage(1);
+
+	if (opt_verbose) {
+		printf("Options:\n");
+		printf("  verbose  = %d\n", opt_verbose);
+		printf("  greeting = %s\n", opt_greeting);
+		printf("  name     = %s\n", opt_name);
+		printf("\n");
+	}
+}
+
+/* Main entry point */
+int main(int argc, char **argv)
+{
+	parse(argc, argv);
+	printf("%s, %s\n", opt_greeting, opt_name);
+	return 0;
+}