/* Implement the vsnprintf function.   Copyright (C) 2003-2026 Free Software Foundation, Inc.   Written by Kaveh R. Ghazi <ghazi@caip.rutgers.edu>. This file is part of the libiberty library.  This library is freesoftware; you can redistribute it and/or modify it under theterms of the GNU General Public License as published by theFree Software Foundation; either version 2, or (at your option)any later version. This library is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See theGNU General Public License for more details. You should have received a copy of the GNU General Public Licensealong with GNU CC; see the file COPYING.  If not, write tothe Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. As a special exception, if you link this library with filescompiled with a GNU compiler to produce an executable, this does not causethe resulting executable to be covered by the GNU General Public License.This exception does not however invalidate any other reasons whythe executable file might be covered by the GNU General Public License. */ /* @deftypefn Supplemental int vsnprintf (char *@var{buf}, size_t @var{n}, @  const char *@var{format}, va_list @var{ap}) This function is similar to @code{vsprintf}, but it will write to@var{buf} at most @code{@var{n}-1} bytes of text, followed by aterminating null byte, for a total of @var{n} bytes.  On error thereturn value is -1, otherwise it returns the number of characters thatwould have been printed had @var{n} been sufficiently large,regardless of the actual value of @var{n}.  Note some pre-C99 systemlibraries do not implement this correctly so users cannot generallyrely on the return value if the system version of this function isused. @end deftypefn */ #include "config.h"#include "ansidecl.h" #include <stdarg.h>#ifdef HAVE_STRING_H#include <string.h>#endif#ifdef HAVE_STDLIB_H#include <stdlib.h>#endif #include "libiberty.h" /* This implementation relies on a working vasprintf.  */intvsnprintf (char *s, size_t n, const char *format, va_list ap){  char *buf = 0;  int result = vasprintf (&buf, format, ap);   if (!buf)    return -1;  if (result < 0)    {      free (buf);      return -1;    }   result = strlen (buf);  if (n > 0)    {      if ((long) n > result)	memcpy (s, buf, result+1);      else        {	  memcpy (s, buf, n-1);	  s[n - 1] = 0;	}    }  free (buf);  return result;} #ifdef TEST/* Set the buffer to a known state.  */#define CLEAR(BUF) do { memset ((BUF), 'X', sizeof (BUF)); (BUF)[14] = '\0'; } while (0)/* For assertions.  */#define VERIFY(P) do { if (!(P)) abort(); } while (0) static int ATTRIBUTE_PRINTF_3checkit (char *s, size_t n, const char *format, ...){  int result;  va_list ap;  va_start (ap, format);  result = vsnprintf (s, n, format, ap);  va_end (ap);  return result;} extern int main (void);intmain (void){  char buf[128];  int status;    CLEAR (buf);  status = checkit (buf, 10, "%s:%d", "foobar", 9);  VERIFY (status==8 && memcmp (buf, "foobar:9\0XXXXX\0", 15) == 0);   CLEAR (buf);  status = checkit (buf, 9, "%s:%d", "foobar", 9);  VERIFY (status==8 && memcmp (buf, "foobar:9\0XXXXX\0", 15) == 0);   CLEAR (buf);  status = checkit (buf, 8, "%s:%d", "foobar", 9);  VERIFY (status==8 && memcmp (buf, "foobar:\0XXXXXX\0", 15) == 0);   CLEAR (buf);  status = checkit (buf, 7, "%s:%d", "foobar", 9);  VERIFY (status==8 && memcmp (buf, "foobar\0XXXXXXX\0", 15) == 0);   CLEAR (buf);  status = checkit (buf, 6, "%s:%d", "foobar", 9);  VERIFY (status==8 && memcmp (buf, "fooba\0XXXXXXXX\0", 15) == 0);   CLEAR (buf);  status = checkit (buf, 2, "%s:%d", "foobar", 9);  VERIFY (status==8 && memcmp (buf, "f\0XXXXXXXXXXXX\0", 15) == 0);   CLEAR (buf);  status = checkit (buf, 1, "%s:%d", "foobar", 9);  VERIFY (status==8 && memcmp (buf, "\0XXXXXXXXXXXXX\0", 15) == 0);   CLEAR (buf);  status = checkit (buf, 0, "%s:%d", "foobar", 9);  VERIFY (status==8 && memcmp (buf, "XXXXXXXXXXXXXX\0", 15) == 0);   return 0;}#endif /* TEST */