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[objdump] Ad a dummy version for as tests

This version is needed only to be able to run the as tests. At this moment
the assembler programs are generating raw files with the text segment data.
This version only dumps the full file in the format that is expected by the
as test shell scripts.

--- a/src/cmd/objdump.c

+++ b/src/cmd/objdump.c

@@ -25,10 +25,31 @@

 	status = EXIT_FAILURE;

 }

+/*

+ * TODO: Dummy implementation used only in the assembler tests

+ */

 static void

 dump(char *fname)

 {

-	/* TODO */

+	int c, n;

+	FILE *fp;

+

+	filename = fname;

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

+		error("%s", strerror(errno));

+		return;

+	}

+

+	puts("data:");

+	for (n = 1; (c = getc(fp)) != EOF; n++)

+		printf("%02X%c", c, (n%16 == 0) ? '\n' : ' ');

+	if (n%16 != 0)

+		putchar('\n');

+

+	if (ferror(fp))

+		error("%s", strerror(errno));

+

+	fclose(fp);

 }

 static void