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[nm] Add parsing of options in command line

The options are not use at this moment, but the flags
are set and can be used in any moment.

--- a/nm/main.c

+++ b/nm/main.c

@@ -14,6 +14,11 @@

 char *argv0;

 int radix = 16;

+int Pflag;

+int Aflag;

+int vflag;

+int gflag;

+int uflag;

 static int

 myrofile(char *fname, FILE *fp)

@@ -159,7 +164,7 @@

 void

 usage(void)

 {

-	fputs("nm [-APv][ -g| -u][-t format] file...\n", stderr);

+	fputs("nm [-APv][ -g| -u][-t format] [file...]\n", stderr);

 	exit(1);

 }

@@ -166,13 +171,32 @@

 int

 main(int argc, char *argv[])

 {

+	char *t;

+

 	ARGBEGIN {

 	case 'A':

+		Aflag = 1;

+		break;

 	case 'g':

+		gflag = 1;

+		break;

 	case 'u':

+		uflag = 1;

+		break;

 	case 'v':

-	/* case 't': */

-		;

+		vflag = 1;

+		break;

+	case 't':

+		t = EARGF(usage());

+		if (!strcmp(t, "o"))

+			radix = 8;

+		else if (!strcmp(t, "d"))

+			radix = 10;

+		else if (!strcmp(t, "x"))

+			radix = 16;

+		else

+			usage();

+		break;

 	default:

 		usage();

 	} ARGEND