feat: ports - netsurf with the monkey frontend

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018Ae69wJS7sueQMUwNxV3nX

www-client/netsurf/compat/iconv.h

@@ -0,0 +1,41 @@
+/*
+ * <iconv.h> for the MontaukOS NetSurf port.
+ *
+ * MontaukOS has no iconv. Rather than port GNU libiconv, this implements the
+ * three-function iconv API on top of libparserutils' charset codecs, which are
+ * already in the ports sysroot.
+ *
+ * That is a good fit rather than a bodge: libparserutils decodes a charset to
+ * UCS-4 and encodes UCS-4 back out, so iconv() is decode-then-encode through a
+ * UCS-4 staging buffer. The supported set is whatever libparserutils supports
+ * -- UTF-8, UTF-16, ASCII, ISO-8859-x and the Windows-125x range -- which is
+ * exactly the set the HTML parser can handle anyway, so nothing is lost that
+ * would otherwise have worked.
+ *
+ * NetSurf touches iconv only from utils/utf8.c.
+ *
+ * NOT SUPPORTED: the "//TRANSLIT" and "//IGNORE" suffixes glibc accepts. They
+ * are stripped and ignored; conversion uses libparserutils' LOOSE error mode,
+ * which substitutes rather than failing.
+ */
+#ifndef _MONTAUK_COMPAT_ICONV_H_
+#define _MONTAUK_COMPAT_ICONV_H_
+
+#include <stddef.h>
+
+typedef void *iconv_t;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+iconv_t iconv_open(const char *tocode, const char *fromcode);
+size_t iconv(iconv_t cd, char **inbuf, size_t *inbytesleft,
+	     char **outbuf, size_t *outbytesleft);
+int iconv_close(iconv_t cd);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif