chfn, chsh: share illegal_passwd_chars() function

Signed-off-by: Sami Kerola <kerolasa@iki.fi>

1 files changed, 34 insertions, 0 deletions

diff --git a/login-utils/ch-common.c b/login-utils/ch-common.c
new file mode 100644
index 000000000..34b09f32d
--- /dev/null
+++ b/login-utils/ch-common.c
@@ -0,0 +1,34 @@
+/*
+ * chfn and chsh shared functions
+ *
+ * this program is free software.  you can redistribute it and
+ * modify it under the terms of the gnu general public license.
+ * there is no warranty.
+ */
+
+#include <ctype.h>
+#include <string.h>
+
+#include "c.h"
+#include "nls.h"
+
+#include "ch-common.h"
+
+/*
+ *  illegal_passwd_chars () -
+ *	check whether a string contains illegal characters
+ */
+int illegal_passwd_chars(const char *str)
+{
+	const char illegal[] = ",:=\"\n";
+	const size_t len = strlen(str);
+	size_t i;
+
+	if (strpbrk(str, illegal))
+		return 1;
+	for (i = 0; i < len; i++) {
+		if (iscntrl(str[i]))
+			return 1;
+	}
+	return 0;
+}