1 files changed, 44 insertions, 0 deletions
diff --git a/stdio/fputws.c b/stdio/fputws.c
new file mode 100644
index 0000000..b31fb17
--- /dev/null
+++ b/stdio/fputws.c
@@ -0,0 +1,44 @@
+/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
+│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
+╞══════════════════════════════════════════════════════════════════════════════╡
+│ Copyright 2020 Justine Alexandra Roberts Tunney                              │
+│                                                                              │
+│ Permission to use, copy, modify, and/or distribute this software for         │
+│ any purpose with or without fee is hereby granted, provided that the         │
+│ above copyright notice and this permission notice appear in all copies.      │
+│                                                                              │
+│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
+│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
+│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
+│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
+│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
+│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
+│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
+│ PERFORMANCE OF THIS SOFTWARE.                                                │
+╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/errno.h"
+#include "libc/stdio/stdio.h"
+
+/**
+ * Writes wide character string to stream.
+ *
+ * Writing stops at the NUL-terminator, which isn't included in output.
+ * This function blocks until the full string is written, unless an
+ * unrecoverable error happens.
+ *
+ * @param s is a NUL-terminated string that's non-NULL
+ * @param f is an open stream
+ * @return strlen(s) or -1 w/ errno on error
+ */
+int fputws(const wchar_t *s, FILE *f) {
+  int res = 0;
+  while (*s) {
+    if (fputwc(*s++, f) == -1) {
+      if (ferror(f) == EINTR) continue;
+      if (feof(f)) errno = f->state = EPIPE;
+      return -1;
+    }
+    ++res;
+  }
+  return ++res;
+}