2 files changed, 14 insertions, 0 deletions
diff --git a/src/common/util.c b/src/common/util.c
index 180712ad6d..f980fa296c 100644
--- a/src/common/util.c
+++ b/src/common/util.c
@@ -704,6 +704,19 @@ tor_strisnonupper(const char *s)
   return 1;
 }
 
+/** Return true iff every character in <b>s</b> is whitespace space; else
+ * return false. */
+int
+tor_strisspace(const char *s)
+{
+  while (*s) {
+    if (!TOR_ISSPACE(*s))
+      return 0;
+    s++;
+  }
+  return 1;
+}
+
 /** As strcmp, except that either string may be NULL.  The NULL string is
  * considered to be before any non-NULL string. */
 int
diff --git a/src/common/util.h b/src/common/util.h
index ff566151cb..13fcc5142d 100644
--- a/src/common/util.h
+++ b/src/common/util.h
@@ -186,6 +186,7 @@ void tor_strlower(char *s) ATTR_NONNULL((1));
 void tor_strupper(char *s) ATTR_NONNULL((1));
 int tor_strisprint(const char *s) ATTR_NONNULL((1));
 int tor_strisnonupper(const char *s) ATTR_NONNULL((1));
+int tor_strisspace(const char *s);
 int strcmp_opt(const char *s1, const char *s2);
 int strcmpstart(const char *s1, const char *s2) ATTR_NONNULL((1,2));
 int strcmp_len(const char *s1, const char *s2, size_t len) ATTR_NONNULL((1,2));