OpenPKG Specs: honeyd/vasprintf.c@a2c6460cfb16 (annotated)

honeyd/vasprintf.c@a2c6460cfb16 (annotated)

honeyd/vasprintf.c

Mon, 28 Jan 2013 17:37:18 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Mon, 28 Jan 2013 17:37:18 +0100
changeset 758: a2c6460cfb16
permissions: -rw-r--r--

Correct socket error reporting improvement with IPv6 portable code,
after helpful recommendation by Saúl Ibarra Corretgé on OSips devlist.

 /* Like vsprintf but provides a pointer to malloc'd storage, which must
    be freed by the caller.
    Copyright (C) 1994, 2003 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., 59 Temple Place - Suite 330,
 Boston, MA 02111-1307, USA.  */
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include "vasprintf.h"
 /*
 @deftypefn Extension int vasprintf (char **@var{resptr}, const char *@var{format}, va_list @var{args})
 Like @code{vsprintf}, but instead of passing a pointer to a buffer,
 you pass a pointer to a pointer.  This function will compute the size
 of the buffer needed, allocate memory with @code{malloc}, and store a
 pointer to the allocated memory in @code{*@var{resptr}}.  The value
 returned is the same as @code{vsprintf} would return.  If memory could
 not be allocated, minus one is returned and @code{NULL} is stored in
 @code{*@var{resptr}}.
 @end deftypefn
 */
 static int int_vasprintf(char **, const char *, va_list);
 static int
 int_vasprintf (result, format, args)
      char **result;
      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;
   memcpy ((void *) &ap, (const void *) &args, sizeof (va_list));
   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++;
 	}
     }
   *result = (char *) malloc (total_width);
   if (*result != NULL)
     return vsprintf (*result, format, args);
   else
     return -1;
 }
 int
 vasprintf (result, format, args)
      char **result;
      const char *format;
      va_list args;
 {
   return int_vasprintf (result, format, args);
 }

OpenPKG Specs / annotate

honeyd/vasprintf.c@a2c6460cfb16 (annotated)

honeyd/vasprintf.c