1 files changed, 64 insertions, 0 deletions
diff --git a/busybox/libbb/parse_number.c b/busybox/libbb/parse_number.c
new file mode 100644
index 0000000..5262239
--- /dev/null
+++ b/busybox/libbb/parse_number.c
@@ -0,0 +1,64 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * bb_xparse_number implementation for busybox
+ *
+ * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
+ *
+ * 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 <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include <errno.h>
+#include <assert.h>
+#include "libbb.h"
+
+extern
+unsigned long bb_xparse_number(const char *numstr,
+							   const struct suffix_mult *suffixes)
+{
+	unsigned long int r;
+	char *e;
+	int old_errno;
+
+	/* Since this is a lib function, we're not allowed to reset errno to 0.
+	 * Doing so could break an app that is deferring checking of errno.
+	 * So, save the old value so that we can restore it if successful. */
+	old_errno = errno;
+	errno = 0;
+	r = strtoul(numstr, &e, 10);
+
+	if ((numstr != e) && !errno) {
+		errno = old_errno;	/* Ok.  So restore errno. */
+		if (!*e) {
+			return r;
+		}
+		if (suffixes) {
+			assert(suffixes->suffix);	/* No nul suffixes. */
+			do {
+				if (strcmp(suffixes->suffix, e) == 0) {
+					if (ULONG_MAX / suffixes->mult < r) {	/* Overflow! */
+						break;
+					}
+					return r * suffixes->mult;
+				}
+				++suffixes;
+			} while (suffixes->suffix);
+		}
+	}
+	bb_error_msg_and_die("invalid number `%s'", numstr);
+}