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tools/vispatch-1.4.6/source/djlib/COPYING.DJ

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+This is the file "copying.dj".  It does NOT apply to any sources or
+binaries copyrighted by UCB Berkeley, the Free Software Foundation, or
+any other agency besides DJ Delorie and others who have agreed to
+allow their sources to be distributed under these terms.
+
+   Copyright Information for sources and executables that are marked
+   Copyright (C) DJ Delorie
+                 334 North Rd
+                 Deerfield NH 03037-1110
+
+This document is Copyright (C) DJ Delorie and may be distributed
+verbatim, but changing it is not allowed.
+
+Source code copyright DJ Delorie is distributed under the terms of the
+GNU General Public Licence, with the following exceptions:
+
+* Sources used to build crt0.o, gcrt0.o, libc.a, libdbg.a, and
+  libemu.a are distributed under the terms of the GNU Library General
+  Public License, rather than the GNU GPL.
+
+* Any existing copyright or authorship information in any given source
+  file must remain intact.  If you modify a source file, a notice to that
+  effect must be added to the authorship information in the source file. 
+
+* Runtime binaries, as provided by DJ in DJGPP, may be distributed
+  without sources ONLY if the recipient is given sufficient information
+  to obtain a copy of djgpp themselves.  This primarily applies to
+  go32-v2.exe, emu387.dxe, and stubedit.exe.
+
+* Runtime objects and libraries, as provided by DJ in DJGPP, when
+  linked into an application, may be distributed without sources ONLY
+  if the recipient is given sufficient information to obtain a copy of
+  djgpp themselves.  This primarily applies to crt0.o and libc.a.
+
+-----
+
+Changes to source code copyright BSD, FSF, or others, by DJ Delorie
+fall under the terms of the original copyright.  Such files usually
+have multiple copyright notices in them.
+
+A copy of the files "COPYING" and "COPYING.LIB" are included with this
+document.  If you did not receive a copy of these files, you may
+obtain one from whence this document was obtained, or by writing:
+
+      Free Software Foundation
+      59 Temple Place - Suite 330
+      Boston, MA 02111-1307
+      USA

tools/vispatch-1.4.6/source/djlib/vsnprntf.c

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+/* DJGPP < v2.04 doesn't have vsnprintf().  The following are
+ * copied over from DJGPP 2.04.  */
+
+/* Copyright (C) 2001 DJ Delorie, see COPYING.DJ for details */
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+#include <limits.h>
+#include <errno.h>
+#include <libc/file.h>
+
+#if !defined(_IONTERM)
+#define _IONTERM 0 /* dummy value */
+#endif /*  _IONTERM */
+
+static __inline__ void __stropenw(FILE *p, char *str, int len)
+{
+  p->_flag = _IOWRT | _IOSTRG | _IONTERM;
+  p->_ptr = str;
+  p->_cnt = len;
+}
+
+static __inline__ void __strclosew(FILE *p)
+{
+  *p->_ptr = '\0';
+}
+
+int
+vsnprintf(char *str, size_t n, const char *fmt, va_list ap)
+{
+  FILE _strbuf;
+  int len;
+
+  /* _cnt is an int in the FILE structure. To prevent wrap-around, we limit
+   * n to between 0 and INT_MAX inclusively. */
+  if (n > INT_MAX)
+  {
+    errno = EFBIG;
+    return -1;
+  }
+
+  memset(&_strbuf, 0, sizeof(_strbuf));
+
+  /* If n == 0, just querying how much space is needed. */
+  if (n > 0)
+    __stropenw(&_strbuf, str, n - 1);
+  else
+    __stropenw(&_strbuf, NULL, 0);
+
+  len = _doprnt(fmt, ap, &_strbuf);
+
+  /* Ensure nul termination */
+  if (n > 0)
+    __strclosew(&_strbuf);
+
+  return len;
+}