[POWERPC] Merge dtc upstream source

This incorporates a copy of dtc into the kernel source, in
arch/powerpc/boot/dtc-src.  This commit only imports the upstream
sources verbatim, a later commit will actually link it into the kernel
Makefiles and use the embedded code during the kernel build.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/boot/dtc-src/srcpos.c

@@ -0,0 +1,105 @@
+/*
+ * Copyright 2007 Jon Loeliger, Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
+ *                                                                   USA
+ */
+
+#include "dtc.h"
+#include "srcpos.h"
+
+
+/*
+ * Record the complete unique set of opened file names.
+ * Primarily used to cache source position file names.
+ */
+#define MAX_N_FILE_NAMES	(100)
+
+const char *file_names[MAX_N_FILE_NAMES];
+static int n_file_names = 0;
+
+/*
+ * Like yylineno, this is the current open file pos.
+ */
+
+int srcpos_filenum = -1;
+
+
+
+FILE *dtc_open_file(const char *fname)
+{
+	FILE *f;
+
+	if (lookup_file_name(fname, 1) < 0)
+		die("Too many files opened\n");
+
+	if (streq(fname, "-"))
+		f = stdin;
+	else
+		f = fopen(fname, "r");
+
+	if (! f)
+		die("Couldn't open \"%s\": %s\n", fname, strerror(errno));
+
+	return f;
+}
+
+
+
+/*
+ * Locate and optionally add filename fname in the file_names[] array.
+ *
+ * If the filename is currently not in the array and the boolean
+ * add_it is non-zero, an attempt to add the filename will be made.
+ *
+ * Returns;
+ *    Index [0..MAX_N_FILE_NAMES) where the filename is kept
+ *    -1 if the name can not be recorded
+ */
+
+int lookup_file_name(const char *fname, int add_it)
+{
+	int i;
+
+	for (i = 0; i < n_file_names; i++) {
+		if (strcmp(file_names[i], fname) == 0)
+			return i;
+	}
+
+	if (add_it) {
+		if (n_file_names < MAX_N_FILE_NAMES) {
+			file_names[n_file_names] = strdup(fname);
+			return n_file_names++;
+		}
+	}
+
+	return -1;
+}
+
+
+const char *srcpos_filename_for_num(int filenum)
+{
+	if (0 <= filenum && filenum < n_file_names) {
+		return file_names[filenum];
+	}
+
+	return 0;
+}
+
+
+const char *srcpos_get_filename(void)
+{
+	return srcpos_filename_for_num(srcpos_filenum);
+}