1 files changed, 69 insertions, 0 deletions
diff --git a/newlib/libc/stdio/vasnprintf.c b/newlib/libc/stdio/vasnprintf.c
new file mode 100644
index 000000000..923ed8307
--- /dev/null
+++ b/newlib/libc/stdio/vasnprintf.c
@@ -0,0 +1,69 @@
+/* Copyright (C) 2007 Eric Blake
+ * Permission to use, copy, modify, and distribute this software
+ * is freely granted, provided that this notice is preserved.
+ */
+/* This code was derived from asprintf.c */
+/* doc in vfprintf.c */
+
+#include <_ansi.h>
+#include <reent.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <limits.h>
+#include <errno.h>
+
+char *
+_DEFUN(_vasnprintf_r, (ptr, buf, lenp, fmt, ap),
+       struct _reent *ptr _AND
+       char *buf _AND
+       size_t *lenp _AND
+       const char *fmt _AND
+       va_list ap)
+{
+  int ret;
+  FILE f;
+  size_t len = *lenp;
+
+  if (buf && len)
+    {
+      /* mark an existing buffer, but allow allocation of larger string */
+      f._flags = __SWR | __SSTR | __SOPT;
+    }
+  else
+    {
+      /* mark a zero-length reallocatable buffer */
+      f._flags = __SWR | __SSTR | __SMBF;
+      len = 0;
+    }
+  f._bf._base = f._p = (unsigned char *) buf;
+  /* For now, inherit the 32-bit signed limit of FILE._bf._size.
+     FIXME - it would be nice to rewrite sys/reent.h to support size_t
+     for _size.  */
+  if (len > INT_MAX)
+    {
+      ptr->_errno = EOVERFLOW;
+      return NULL;
+    }
+  f._bf._size = f._w = len;
+  f._file = -1;  /* No file. */
+  ret = _vfprintf_r (ptr, &f, fmt, ap);
+  if (ret < 0)
+    return NULL;
+  *lenp = ret;
+  *f._p = '\0';
+  return (char *) f._bf._base;
+}
+
+#ifndef _REENT_ONLY
+
+char *
+_DEFUN(vasnprintf, (buf, lenp, fmt, ap),
+       char *buf _AND
+       size_t *lenp _AND
+       const char *fmt _AND
+       va_list ap)
+{
+  return _vasnprintf_r (_REENT, buf, lenp, fmt, ap);
+}
+
+#endif /* ! _REENT_ONLY */