mdadm: Follow POSIX Portable Character Set

[thirdparty/mdadm.git] / lib.c

diff --git a/lib.c b/lib.c
index 03198e2dca5905cf318cd6b70c5bf98c824c8008..7ab5998806cf77d7a79cf8107cab179d6866c478 100644 (file)
--- a/lib.c
+++ b/lib.c
@@ -483,24 +483,50 @@ void print_quoted(char *str)
        putchar(q);
 }
 
-void print_escape(char *str)
+/**
+ * is_alphanum() - Check if sign is letter or digit.
+ * @c: char to analyze.
+ *
+ * Similar to isalnum() but additional locales are excluded.
+ *
+ * Return: %true on success, %false otherwise.
+ */
+bool is_alphanum(const char c)
 {
-       /* print str, but change space and tab to '_'
-        * as is suitable for device names
-        */
-       for (; *str; str++) {
-               switch (*str) {
-               case ' ':
-               case '\t':
-                       putchar('_');
-                       break;
-               case '/':
-                       putchar('-');
-                       break;
-               default:
-                       putchar(*str);
-               }
+       if (isupper(c) || islower(c) || isdigit(c) != 0)
+               return true;
+       return false;
+}
+
+/**
+ * is_name_posix_compatible() - Check if name is POSIX compatible.
+ * @name: name to check.
+ *
+ *  POSIX portable file name character set contains ASCII letters,
+ *  digits, '_', '.', and '-'. Also forbid leading '-'.
+ *  The length of the name cannot exceed NAME_MAX - 1 (ensure NULL ending).
+ *
+ * Return: %true on success, %false otherwise.
+ */
+bool is_name_posix_compatible(const char * const name)
+{
+       assert(name);
+
+       char allowed_symbols[] = "-_.";
+       const char *n = name;
+
+       if (!is_string_lq(name, NAME_MAX))
+               return false;
+
+       if (*n == '-')
+               return false;
+
+       while (*n != '\0') {
+               if (!is_alphanum(*n) && !strchr(allowed_symbols, *n))
+                       return false;
+               n++;
        }
+       return true;
 }
 
 int check_env(char *name)