2 files changed, 47 insertions, 0 deletions
diff --git a/system/lib/libc/musl/src/stdio/fputws.c b/system/lib/libc/musl/src/stdio/fputws.c
new file mode 100644
index 00000000..70e004c9
--- /dev/null
+++ b/system/lib/libc/musl/src/stdio/fputws.c
@@ -0,0 +1,30 @@
+#include "stdio_impl.h"
+#include <wchar.h>
+
+int fputws(const wchar_t *restrict ws, FILE *restrict f)
+{
+	unsigned char buf[BUFSIZ];
+	size_t l=0;
+
+	FLOCK(f);
+
+#if 0 // XXX EMSCRIPTEN
+	f->mode |= f->mode+1;
+#endif
+
+	while (ws && (l = wcsrtombs((void *)buf, (void*)&ws, sizeof buf, 0))+1 > 1)
+#if 0 // XXX EMSCRIPTEN
+		if (__fwritex(buf, l, f) < l) {
+#else
+		if (fwrite(buf, 1, l, f) < l) {
+#endif
+			FUNLOCK(f);
+			return -1;
+		}
+
+	FUNLOCK(f);
+
+	return l; /* 0 or -1 */
+}
+
+weak_alias(fputws, fputws_unlocked);
diff --git a/system/lib/libc/musl/src/stdio/vswprintf.c b/system/lib/libc/musl/src/stdio/vswprintf.c
index 7d237bae..e906f7ae 100644
--- a/system/lib/libc/musl/src/stdio/vswprintf.c
+++ b/system/lib/libc/musl/src/stdio/vswprintf.c
@@ -29,6 +29,7 @@ static size_t sw_write(FILE *f, const unsigned char *s, size_t l)
 
 int vswprintf(wchar_t *restrict s, size_t n, const wchar_t *restrict fmt, va_list ap)
 {
+#if 0 // XXX EMSCRIPTEN
 	int r;
 	FILE f;
 	unsigned char buf[256];
@@ -50,4 +51,20 @@ int vswprintf(wchar_t *restrict s, size_t n, const wchar_t *restrict fmt, va_lis
 	r = vfwprintf(&f, fmt, ap);
 	sw_write(&f, 0, 0);
 	return r>=n ? -1 : r;
+#else
+  // XXX EMSCRIPTEN: use memfs through libc fs
+  // we write to a file, which is in multibyte, then we read, then expand to widechar
+  #define TEMPFILE "emscripten.vswprintf.temp.buffer"
+  FILE *f = fopen(TEMPFILE, "wb");
+  int r = vfwprintf(f, fmt, ap);
+  fclose(f);
+  f = fopen(TEMPFILE, "rb");
+  char buffer[r+1];
+  fread(buffer, 1, r, f);
+  fclose(f);
+  remove(TEMPFILE);
+  buffer[r] = 0;
+  r = mbstowcs(s, buffer, n);
+  return r>=n ? -1 : r;
+#endif
 }