3 files changed, 11 insertions, 1 deletions
diff --git a/src/lib/string/compat_string.h b/src/lib/string/compat_string.h
index f05265bdcc..5c9bf05ebd 100644
--- a/src/lib/string/compat_string.h
+++ b/src/lib/string/compat_string.h
@@ -42,7 +42,7 @@ static inline int strcasecmp(const char *a, const char *b) {
  * (If --enable-fragile-hardening is passed to configure, we use the hardened
  * variants, which do not suffer from this issue.)
  *
- * See https://trac.torproject.org/projects/tor/ticket/15205
+ * See https://bugs.torproject.org/tpo/core/tor/15205.
  */
 #undef strlcat
 #undef strlcpy
diff --git a/src/lib/string/util_string.c b/src/lib/string/util_string.c
index c8f12d780e..ba5f9f2203 100644
--- a/src/lib/string/util_string.c
+++ b/src/lib/string/util_string.c
@@ -143,6 +143,15 @@ tor_strupper(char *s)
   }
 }
 
+/** Replaces <b>old</b> with <b>replacement</b> in <b>s</b> */
+void
+tor_strreplacechar(char *s, char find, char replacement)
+{
+  for (s = strchr(s, find); s; s = strchr(s + 1, find)) {
+    *s = replacement;
+  }
+}
+
 /** Return 1 if every character in <b>s</b> is printable, else return 0.
  */
 int
diff --git a/src/lib/string/util_string.h b/src/lib/string/util_string.h
index e89233df88..15d35415fe 100644
--- a/src/lib/string/util_string.h
+++ b/src/lib/string/util_string.h
@@ -31,6 +31,7 @@ int tor_digest256_is_zero(const char *digest);
 #define HEX_CHARACTERS "0123456789ABCDEFabcdef"
 void tor_strlower(char *s);
 void tor_strupper(char *s);
+void tor_strreplacechar(char *s, char find, char replacement);
 int tor_strisprint(const char *s);
 int tor_strisnonupper(const char *s);
 int tor_strisspace(const char *s);