name: add simple name string validator

2 files changed, 28 insertions, 0 deletions

diff --git a/name.c b/name.c
index 4b4b0b87d..15e324c5f 100644
--- a/name.c
+++ b/name.c
@@ -2,6 +2,7 @@
 
 #include <assert.h>
 #include <errno.h>
+#include <string.h>
 
 #include "set.h"
 #include "name.h"
@@ -30,6 +31,32 @@ NameType name_type_from_string(const char *n) {
         return _NAME_TYPE_INVALID;
 }
 
+#define VALID_CHARS                             \
+        "0123456789"                            \
+        "abcdefghijklmnopqrstuvwxyz"            \
+        "ABCDEFGHIJKLMNOPQRSTUVWXYZ"            \
+        "-_"
+
+bool name_is_valid(const char *n) {
+        NameType t;
+        const char *e, *i;
+
+        assert(n);
+
+        t = name_type_from_string(n);
+        if (t < 0 || t >= _NAME_TYPE_MAX)
+                return false;
+
+        if (!(e = strrchr(n, '.')))
+                return false;
+
+        for (i = n; i < e; i++)
+                if (!strchr(VALID_CHARS, *i))
+                        return false;
+
+        return true;
+}
+
 Name *name_new(Manager *m) {
         Name *n;
 
diff --git a/name.h b/name.h
index 3b364f00f..062c95aa1 100644
--- a/name.h
+++ b/name.h
@@ -260,6 +260,7 @@ DEFINE_CAST(SNAPSHOT, Snapshot, snapshot);
 
 bool name_is_ready(Name *name);
 NameType name_type_from_string(const char *n);
+bool name_is_valid(const char *n);
 
 Name *name_new(Manager *m);
 void name_free(Name *name);