1 files changed, 66 insertions, 0 deletions
diff --git a/usr.sbin/pw/strtounum.c b/usr.sbin/pw/strtounum.c
new file mode 100644
index 000000000000..b138e7f130b7
--- /dev/null
+++ b/usr.sbin/pw/strtounum.c
@@ -0,0 +1,66 @@
+/*-
+ * Copyright (C) 2015 Baptiste Daroussin <bapt@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer
+ *    in this position and unchanged.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <limits.h>
+#include <stdlib.h>
+
+#include "pw.h"
+
+uintmax_t
+strtounum(const char * __restrict np, uintmax_t minval, uintmax_t maxval,
+    const char ** __restrict errpp)
+{
+	char *endp;
+	uintmax_t ret;
+
+	*errpp = NULL;
+	if (minval > maxval) {
+		errno = EINVAL;
+		*errpp = "invalid";
+		return (0);
+	}
+	errno = 0;
+	ret = strtoumax(np, &endp, 10);
+	if (endp == np || *endp != '\0') {
+		errno = EINVAL;
+		*errpp = "invalid";
+		return (0);
+	}
+	if (ret < minval) {
+		errno = ERANGE;
+		*errpp = "too small";
+		return (0);
+	}
+	if (errno == ERANGE || ret > maxval) {
+		errno = ERANGE;
+		*errpp = "too large";
+		return (0);
+	}
+	return (ret);
+}