Added example option.c

1 files changed, 94 insertions, 0 deletions

diff --git a/examples/option.c b/examples/option.c
new file mode 100644
index 00000000..308348b0
--- /dev/null
+++ b/examples/option.c
@@ -0,0 +1,94 @@
+#include <stc/coption.h>
+#include <stdio.h>
+
+// mkdir option parsing.
+struct AppArgs { 
+	const char *mode;
+	bool parent;
+	bool verbose;
+	const char *context;
+	int index;
+};
+
+int parseArgs(int argc, char *argv[], struct AppArgs *args)
+{
+	const char *shortopts = "pvm:Z";
+    coption_long longopts[] = {
+      {"mode",    coption_required_argument, 'm'},
+      {"parent",  coption_no_argument,       'p'},
+      {"verbose", coption_no_argument,       'v'},
+      {"context", coption_optional_argument, 'Z'},
+      {"help",    coption_no_argument,       'H'},
+      {"version", coption_no_argument,       'V'},
+      {NULL}
+    };
+    *args = (struct AppArgs){NULL};
+    coption opt = coption_init();
+    int c;
+    while ((c = coption_get(&opt, argc, argv, shortopts, longopts)) != -1) {
+        switch (c) {
+            case 'm': args->mode = opt.arg; break;
+            case 'p': args->parent = true; break;
+            case 'v': args->verbose = true; break;
+            case 'Z': args->context = opt.arg? opt.arg : "DEFAULT"; break;
+            case 'H':
+				printf( "Usage: mkdir [OPTION]... DIRECTORY...\n"
+						"Create the DIRECTORY(ies), if they do not already exist.\n\n"
+						"Mandatory arguments to long options are mandatory for short options too.\n"
+						"  -m, --mode=MODE   set file mode (as in chmod), not a=rwx - umask\n"
+						"  -p, --parents     no error if existing, make parent directories as needed\n"
+						"  -v, --verbose     print a message for each created directory\n"
+						"  -Z                   set SELinux security context of each created directory\n"
+						"                         to the default type\n"
+						"      --context[=CTX]  like -Z, or if CTX is specified then set the SELinux\n"
+						"                         or SMACK security context to CTX\n"
+						"      --help     display this help and exit\n"
+						"      --version  output version information and exit\n\n"
+						"GNU coreutils online help: <https://www.gnu.org/software/coreutils/>\n"
+						"Full documentation at: <https://www.gnu.org/software/coreutils/mkdir>\n"
+						"or available locally via: info '(coreutils) mkdir invocation'\n" );
+				return 1;
+            case 'V': 
+				printf(	"mkdir (GNU coreutils) 8.30\n"
+					   	"Copyright (C) 2018 Free Software Foundation, Inc.\n"
+					   	"License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.\n"
+					   	"This is free software: you are free to change and redistribute it.\n"
+					   	"There is NO WARRANTY, to the extent permitted by law.\n" );
+				return 1;
+            case ':':
+                printf("mkdir: option '%s' requires an argument\n"
+            	       "Try 'mkdir --help' for more information.\n", opt.optstr);
+				return -2;
+            case '?':
+            	printf("mkdir: invalid option '%s'\n"
+            	       "Try 'mkdir --help' for more information.\n", opt.optstr);
+				return -3;
+        }
+    }
+
+	if (opt.ind == argc) {
+		printf("mkdir: missing operand\n"
+		       "Try 'mkdir --help' for more information.\n");
+		return -1;
+	}
+	args->index = opt.ind;
+    return 0;
+}
+
+
+int main(int argc, char* argv[])
+{
+	struct AppArgs args;
+	int ret = parseArgs(argc, argv, &args);
+	if (ret != 0)
+		return ret < 0? ret : 0;
+
+	printf("mkdir:");
+    for (int i=args.index; i < argc; ++i) {
+        printf(" %s\n", argv[i]);
+    }
+    printf("  mode:%s\n  parent:%d\n  verbose:%d\n  context:%s\n",
+           args.mode? args.mode:"",
+           args.parent, args.verbose,
+           args.context? args.context:"");
+}
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