New modules 'dprintf', 'dprintf-posix'.

1 files changed, 67 insertions, 0 deletions

diff --git a/lib/dprintf.c b/lib/dprintf.c
new file mode 100644
index 0000000000..91e4a93143
--- /dev/null
+++ b/lib/dprintf.c
@@ -0,0 +1,67 @@
+/* Formatted output to a file descriptor.
+   Copyright (C) 2009 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+/* Specification.  */
+#include <stdio.h>
+
+#include <errno.h>
+#include <limits.h>
+#include <stdarg.h>
+#include <stdlib.h>
+
+#include "full-write.h"
+#include "vasnprintf.h"
+
+int
+dprintf (int fd, const char *format, ...)
+{
+  char buf[2000];
+  char *output;
+  size_t len;
+  size_t lenbuf = sizeof (buf);
+  va_list args;
+
+  va_start (args, format);
+  output = vasnprintf (buf, &lenbuf, format, args);
+  len = lenbuf;
+  va_end (args);
+
+  if (!output)
+    return -1;
+
+  if (full_write (fd, output, len) < len)
+    {
+      if (output != buf)
+	{
+	  int saved_errno = errno;
+	  free (output);
+	  errno = saved_errno;
+	}
+      return -1;
+    }
+
+  if (len > INT_MAX)
+    {
+      errno = EOVERFLOW;
+      return -1;
+    }
+
+  return len;
+}