1 files changed, 38 insertions, 0 deletions
diff --git a/utils/dup_wc_to_mb.c b/utils/dup_wc_to_mb.c
new file mode 100644
index 00000000..36088196
--- /dev/null
+++ b/utils/dup_wc_to_mb.c
@@ -0,0 +1,38 @@
+/*
+ * dup_wc_to_mb: memory-allocating wrapper on wc_to_mb.
+ *
+ * Also dup_wc_to_mb_c: same but you already know the length of the
+ * string.
+ */
+
+#include <wchar.h>
+
+#include "putty.h"
+#include "misc.h"
+
+char *dup_wc_to_mb_c(int codepage, int flags, const wchar_t *string, int len,
+                     const char *defchr)
+{
+    size_t outsize = len+1;
+    char *out = snewn(outsize, char);
+
+    while (true) {
+        size_t outlen = wc_to_mb(codepage, flags, string, len, out, outsize,
+                                 defchr);
+        /* We can only be sure we've consumed the whole input if the
+         * output is not within a multibyte-character-length of the
+         * end of the buffer! */
+        if (outlen < outsize && outsize - outlen > MB_LEN_MAX) {
+            out[outlen] = '\0';
+            return out;
+        }
+
+        sgrowarray(out, outsize, outsize);
+    }
+}
+
+char *dup_wc_to_mb(int codepage, int flags, const wchar_t *string,
+                   const char *defchr)
+{
+    return dup_wc_to_mb_c(codepage, flags, string, wcslen(string), defchr);
+}