string: Add ssh_string_get_char().

include/libssh/libssh.h

@@ -526,6 +526,7 @@ LIBSSH_API void ssh_string_free(ssh_string str);
 LIBSSH_API ssh_string ssh_string_from_char(const char *what);
 LIBSSH_API size_t ssh_string_len(ssh_string str);
 LIBSSH_API ssh_string ssh_string_new(size_t size);
+LIBSSH_API const char *ssh_string_get_char(ssh_string str);
 LIBSSH_API char *ssh_string_to_char(ssh_string str);
 LIBSSH_API void ssh_string_free_char(char *s);
 

src/string.c

@@ -130,6 +130,25 @@ size_t ssh_string_len(struct ssh_string_struct *s) {
   return ntohl(s->size);
 }
 
+/**
+ * @brief Get the the string as a C nul-terminated string.
+ *
+ * This is only available as long as the SSH string exists.
+ *
+ * @param[in] s         The SSH string to get the C string from.
+ *
+ * @return              The char pointer, NULL on error.
+ */
+const char *ssh_string_get_char(struct ssh_string_struct *s)
+{
+    if (s == NULL) {
+        return NULL;
+    }
+    s->data[ssh_string_len(s)] = '\0';
+
+    return (const char *) s->data;
+}
+
 /**
  * @brief Convert a SSH string to a C nul-terminated string.
  *