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[nm] Add nm() function

This function is going to be the core of the program. At this moment
it does almost nothing, but at least it opens the file.

--- a/nm/main.c

+++ b/nm/main.c

@@ -1,17 +1,38 @@

 static char sccsid[] = "@(#) ./nm/main.c";

+#include <errno.h>

 #include <stdio.h>

 #include <stdlib.h>

+#include <string.h>

 #include "../inc/arg.h"

 #include "../inc/scc.h"

+#include "../inc/myro.h"

 char *argv0;

+int radix = 16;

 void

+nm(char *fname)

+{

+	FILE *fp;

+	struct myrohdr hdr;

+

+	if ((fp = fopen(fname, "rb")) == NULL)

+		goto file_error;

+	if (readhdr(fp, &hdr) == EOF)

+		goto file_error;

+	if (strncmp(hdr.magic, MYROMAGIC, MYROMAGIC_SIZ))

+		die("nm: %s: File format not recognized", fname);

+

+file_error:

+	die("nm: %s: %s", fname, strerror(errno));

+}

+

+void

 usage(void)

 {

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

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

 	exit(1);

 }

@@ -20,18 +41,21 @@

 {

 	ARGBEGIN {

 	case 'A':

-	case 'e':

-	case 'f':

 	case 'g':

-	case 'o':

 	case 'u':

 	case 'v':

-	case 'x':

 	/* case 't': */

 		;

 	default:

 		usage();

 	} ARGEND

+

+	if (argc == 0) {

+		nm("a.out");

+	} else {

+		while (argc-- > 0)

+			nm(*++argv);

+	}

 	return 0;

 }