Update.

2000-07-20  Ulrich Drepper  <drepper@redhat.com>

	* libio/Makefile (tests): Add tst_wprintf2.
	(tst_wprintf2-ARGS): Define.
	* libio/tst_wprintf2.c: New file.
	Based on a test case by Yoshito Kawada <KAWADA@jp.ibm.com>.

	* libio/wfiledoalloc.c: Only allocate external buffer if this
	hasn't happened yet.

	* libio/wfileops.c (_IO_wdo_write): Overflow only if there is really
	something in the buffer.  gconv call can write up to end of the
	buffer, not only _IO_write_end.
	(_IO_wfile_overflow): Allocate also external buffer.

	* stdio-common/vfprintf.c (process_string_arg): Handle multibyte
	strings with precision in vfwprintf correctly.
	* stdio-common/vfprintf.c: Fix completely broken handling of
	unbuffered wide character streams.
	Reported by Yoshito Kawada <KAWADA@jp.ibm.com>.

libio/tst_wprintf2.c

@@ -0,0 +1,104 @@
+/* Test case by Yoshito Kawada <KAWADA@jp.ibm.com>.  */
+#include <errno.h>
+#include <error.h>
+#include <fcntl.h>
+#include <locale.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <wchar.h>
+
+int
+main (int argc, char *argv[])
+{
+  int a = 3;
+  int fd;
+  char name[] = "/tmp/wprintf.out.XXXXXX";
+  FILE *fp;
+  char buf[100];
+  size_t len;
+  int res = 0;
+
+  fd = mkstemp (name);
+  if (fd == -1)
+    error (EXIT_FAILURE, errno, "cannot open temporary file");
+
+  unlink (name);
+
+  setlocale (LC_ALL, "");
+
+  fp = fdopen (dup (fd), "w");
+  if (fp == NULL)
+    error (EXIT_FAILURE, errno, "fdopen(,\"w\")");
+
+  fwprintf (fp, L"test start");
+  fwprintf (fp, L" int %d\n", a);
+
+  /* String with precision.  */
+  fwprintf (fp, L"1[%6.3s]\n", argv[1]);
+
+  fclose (fp);
+
+  fp = fdopen (dup (fd), "a");
+  if (fp == NULL)
+    error (EXIT_FAILURE, errno, "fdopen(,\"a\")");
+
+  setvbuf (fp, NULL, _IONBF, 0);
+
+  /* fwprintf to unbuffered stream.   */
+  fwprintf (fp, L"hello.\n");
+
+  fclose (fp);
+
+
+  /* Now read it back in.  This time using multibyte functions.  */
+  lseek (fd, SEEK_SET, 0);
+  fp = fdopen (fd, "r");
+  if (fp == NULL)
+    error (EXIT_FAILURE, errno, "fdopen(,\"r\")");
+
+  if (fgets (buf, sizeof buf, fp) != buf)
+    error (EXIT_FAILURE, errno, "first fgets");
+  len = strlen (buf);
+  if (buf[len - 1] == '\n')
+    --len;
+  else
+    {
+      puts ("newline missing after first line");
+      res = 1;
+    }
+  printf ("1st line: \"%.*s\" -> %s\n", (int) len, buf,
+	  strncmp (buf, "test start int 3", len) == 0 ? "OK" : "FAIL");
+  res |= strncmp (buf, "test start int 3", len) != 0;
+
+  if (fgets (buf, sizeof buf, fp) != buf)
+    error (EXIT_FAILURE, errno, "second fgets");
+  len = strlen (buf);
+  if (buf[len - 1] == '\n')
+    --len;
+  else
+    {
+      puts ("newline missing after second line");
+      res = 1;
+    }
+  printf ("2nd line: \"%.*s\" -> %s\n", (int) len, buf,
+	  strncmp (buf, "1[   Som]", len) == 0 ? "OK" : "FAIL");
+  res |= strncmp (buf, "1[   Som]", len) != 0;
+
+  if (fgets (buf, sizeof buf, fp) != buf)
+    error (EXIT_FAILURE, errno, "third fgets");
+  len = strlen (buf);
+  if (buf[len - 1] == '\n')
+    --len;
+  else
+    {
+      puts ("newline missing after third line");
+      res = 1;
+    }
+  printf ("3rd line: \"%.*s\" -> %s\n", (int) len, buf,
+	  strncmp (buf, "hello.", len) == 0 ? "OK" : "FAIL");
+  res |= strncmp (buf, "hello.", len) != 0;
+
+  return res;
+}