/* Estimate the length of the string generated by a vprintf-like
  function.  Used by vasprintf and xvasprintf.
  Copyright (C) 1994-2024 Free Software Foundation, Inc.

This file is part of the libiberty library.
Libiberty is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.

Libiberty 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
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with libiberty; see the file COPYING.LIB.  If not, write
to the Free Software Foundation, Inc., 51 Franklin Street - Fifth
Floor, Boston, MA 02110-1301, USA.  */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <ansidecl.h>
#include <stdarg.h>
#if !defined (va_copy) && defined (__va_copy)
# define va_copy(d,s)  __va_copy((d),(s))
#endif
#include <stdio.h>
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#else
extern unsigned long strtoul ();
#endif
#include "libiberty.h"

int
libiberty_vprintf_buffer_size (const char *format, va_list args)
{
 const char *p = format;
 /* Add one to make sure that it is never zero, which might cause malloc
    to return NULL.  */
 int total_width = strlen (format) + 1;
 va_list ap;

#ifdef va_copy
 va_copy (ap, args);
#else
 memcpy ((void *) &ap, (void *) &args, sizeof (va_list));
#endif

 while (*p != '\0')
   {
     if (*p++ == '%')
       {
         while (strchr ("-+ #0", *p))
           ++p;
         if (*p == '*')
           {
             ++p;
             total_width += abs (va_arg (ap, int));
           }
         else
           total_width += strtoul (p, (char **) &p, 10);
         if (*p == '.')
           {
             ++p;
             if (*p == '*')
               {
                 ++p;
                 total_width += abs (va_arg (ap, int));
               }
             else
             total_width += strtoul (p, (char **) &p, 10);
           }
         while (strchr ("hlL", *p))
           ++p;
         /* Should be big enough for any format specifier except %s and floats.  */
         total_width += 30;
         switch (*p)
           {
           case 'd':
           case 'i':
           case 'o':
           case 'u':
           case 'x':
           case 'X':
           case 'c':
             (void) va_arg (ap, int);
             break;
           case 'f':
           case 'e':
           case 'E':
           case 'g':
           case 'G':
             (void) va_arg (ap, double);
             /* Since an ieee double can have an exponent of 307, we'll
                make the buffer wide enough to cover the gross case. */
             total_width += 307;
             break;
           case 's':
             total_width += strlen (va_arg (ap, char *));
             break;
           case 'p':
           case 'n':
             (void) va_arg (ap, char *);
             break;
           }
         p++;
       }
   }
#ifdef va_copy
 va_end (ap);
#endif
 return total_width;
}